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CN119044605A - Method, device, equipment and storage medium for measuring insulation resistance of power equipment - Google Patents

Method, device, equipment and storage medium for measuring insulation resistance of power equipment Download PDF

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Publication number
CN119044605A
CN119044605A CN202411174143.4A CN202411174143A CN119044605A CN 119044605 A CN119044605 A CN 119044605A CN 202411174143 A CN202411174143 A CN 202411174143A CN 119044605 A CN119044605 A CN 119044605A
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China
Prior art keywords
voltage
resistor
resistance
insulation
negative
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CN202411174143.4A
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Chinese (zh)
Inventor
赵洪山
王海萍
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Beijing Shenglanda Technology Co ltd
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Beijing Shenglanda Technology Co ltd
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Priority to CN202411174143.4A priority Critical patent/CN119044605A/en
Publication of CN119044605A publication Critical patent/CN119044605A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/10—AC or DC measuring bridges
    • G01R17/105—AC or DC measuring bridges for measuring impedance or resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The application is suitable for the technical field of power equipment detection, and provides a method, a device, equipment and a storage medium for measuring insulation resistance of power equipment, wherein the method comprises the steps of obtaining voltage from an upper bridge arm sampling point to a reference point of a Wheatstone bridge and voltage from a lower bridge arm sampling point to the reference point, and respectively recording the voltage as a first voltage and a second voltage; the method comprises the steps of calculating the sum of the voltage of a positive-end insulation resistor and the voltage of a negative-end insulation resistor based on a first voltage and a second voltage, recording the sum as a total voltage, judging whether the first voltage and the second voltage are zero or not to obtain a judging result, and calculating the resistance of the positive-end insulation resistor and the resistance of the negative-end insulation resistor based on the first voltage and/or the second voltage and the total voltage by combining the judging result. The application can accurately measure the insulation resistance of the equipment under the condition of no power failure and improve the detection efficiency and the safety.

Description

Method, device, equipment and storage medium for measuring insulation resistance of power equipment
Technical Field
The application belongs to the technical field of power equipment detection, and particularly relates to a method, a device, equipment and a storage medium for measuring insulation resistance of power equipment.
Background
The insulation state of the power equipment is an important factor for guaranteeing the safe operation of the power system. As equipment complexity increases and service life increases, efficient insulation detection methods become particularly important. The traditional insulation resistance measurement method mostly adopts a voltage injection method, and calculates insulation resistance by applying direct-current high voltage on equipment insulation and measuring leakage current, so that power failure is needed to be carried out, normal operation of the equipment is affected, and potential safety hazards are possibly brought.
Disclosure of Invention
The embodiment of the application provides an on-line measuring method, device, equipment and storage medium for insulation resistance of power equipment, which can accurately measure the insulation resistance of the equipment under the condition of no power failure and improve the detection efficiency and safety.
The application is realized by the following technical scheme:
In a first aspect, an embodiment of the present application provides a method for measuring insulation resistance of a power device, which is applied to a power device to be measured connected with a wheatstone bridge, wherein an upper bridge arm of the wheatstone bridge is connected with a positive insulation resistance of the power device to be measured, and a lower bridge arm of the wheatstone bridge is connected with a negative insulation resistance of the power device to be measured:
And acquiring the voltage from the upper bridge arm sampling point to the reference point of the Wheatstone bridge and the voltage from the lower bridge arm sampling point to the reference point, and respectively recording the voltage as a first voltage and a second voltage.
Based on the first voltage and the second voltage, the sum of the values of the voltage of the positive-side insulation resistance and the voltage of the negative-side insulation resistance is calculated and is recorded as the total voltage.
And judging whether the first voltage and the second voltage are zero or not to obtain a judging result.
And calculating the resistance of the positive insulation resistor and the resistance of the negative insulation resistor based on the first voltage and/or the second voltage and the total voltage according to the judging result.
With reference to the first aspect, in some possible implementations, the wheatstone bridge includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, and a second switch, and a first end of the positive-side insulation resistor is connected to a first end of the negative-side insulation resistor.
The first end of the first resistor is connected with the second end of the positive-end insulating resistor, the second end of the first resistor is connected with the first end of the first switch, the second end of the first switch is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the second switch, the second end of the second switch is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the second end of the negative-end insulating resistor.
The reference point is grounded and is also connected to the second end of the second resistor.
With reference to the first aspect, in some possible implementations, calculating, based on the first voltage and the second voltage, a sum of values of a voltage of the positive-side insulation resistance and a voltage of the negative-side insulation resistance, denoted as a total voltage, includes:
and controlling the first switch and the second switch to be closed, and calculating the sum of the voltage of the positive-end insulation resistor and the voltage of the negative-end insulation resistor based on the first voltage and the second voltage and combining a first formula to be recorded as the total voltage.
The first formula is:
Wherein V Total (S) represents the total voltage, V 1 represents the first voltage, R 1 represents the resistance of the first resistor, R 2 represents the resistance of the second resistor, V 2 represents the second voltage, R 3 represents the resistance of the third resistor, and R 4 represents the resistance of the fourth resistor.
With reference to the first aspect, in some possible implementations, in combination with the determination result, calculating a resistance value of the positive-end insulation resistor and a resistance value of the negative-end insulation resistor based on the first voltage and/or the second voltage, and the total voltage includes:
If the first voltage and the second voltage are equal to zero, the resistance of the insulation resistor at the positive end is infinite, and the resistance of the insulation resistor at the negative end is infinite.
And controlling the first switch to be opened and the second switch to be closed, and calculating the resistance of the positive-end insulation resistor based on the total voltage and the second voltage.
And controlling the first switch to be closed and the second switch to be opened, and calculating the resistance of the insulation resistor of the negative terminal based on the total voltage and the first voltage.
If the first voltage and the second voltage are not equal to zero, the resistance of the positive insulation resistor and the resistance of the negative insulation resistor are calculated based on the voltage of the positive insulation resistor, the voltage of the negative insulation resistor, the first voltage and the second voltage.
With reference to the first aspect, in some possible implementations, calculating a resistance value of the positive-side insulation resistance based on the total voltage and the second voltage includes:
and calculating the resistance of the positive insulation resistor by combining a second formula based on the total voltage and the second voltage.
The second formula is:
wherein, R + represents the resistance value of the positive-end insulation resistor, V Total (S) represents the total voltage, V 2 represents the second voltage, R 3 represents the resistance value of the third resistor, and R 4 represents the resistance value of the fourth resistor.
With reference to the first aspect, in some possible implementations, calculating a resistance value of the negative-side insulation resistance based on the total voltage and the first voltage includes:
based on the total voltage and the first voltage, in combination with a third formula, the resistance of the negative terminal insulation resistance is calculated.
The third formula is:
Wherein R - represents the resistance value of the negative-side insulation resistor, V Total (S) represents the total voltage, V 1 represents the first voltage, R 1 represents the resistance value of the first resistor, and R 2 represents the resistance value of the second resistor.
With reference to the first aspect, in some possible implementations, calculating the resistance of the positive-side insulation resistor and the resistance of the negative-side insulation resistor based on the voltage of the positive-side insulation resistor, the voltage of the negative-side insulation resistor, the first voltage, and the second voltage includes:
Based on the voltage of the positive end insulation resistor, the voltage of the negative end insulation resistor, the first voltage and the second voltage, the resistance of the positive end insulation resistor is calculated by combining a fourth formula, and the resistance of the negative end insulation resistor is calculated by combining a fifth formula.
The fourth formula is:
the fifth formula is:
Wherein, R + represents the resistance value of the positive-side insulation resistor, R - represents the resistance value of the negative-side insulation resistor, V + represents the voltage of the positive-side insulation resistor, V - represents the voltage of the negative-side insulation resistor, V 1 represents the first voltage, R 1 represents the resistance value of the first resistor, R 2 represents the resistance value of the second resistor, V 2 represents the second voltage, R 3 represents the resistance value of the third resistor, and R 4 represents the resistance value of the fourth resistor.
In a second aspect, an embodiment of the present application provides an insulation resistance measurement device for a power device to be measured, where the insulation resistance measurement device is applied to a power device to be measured connected with a wheatstone bridge, an upper bridge arm of the wheatstone bridge is connected with a positive insulation resistance of the power device to be measured, a lower bridge arm of the wheatstone bridge is connected with a negative insulation resistance of the power device to be measured, and a connection point between the positive insulation resistance and the negative insulation resistance of the power device to be measured is used as a reference point, where the device includes:
The data acquisition module is used for acquiring the voltage from the upper bridge arm sampling point to the reference point and the voltage from the lower bridge arm sampling point to the reference point of the Wheatstone bridge, and the voltages are respectively recorded as a first voltage and a second voltage.
And the data calculation module is used for calculating the sum of the voltage of the positive end insulation resistor and the voltage of the negative end insulation resistor based on the first voltage and the second voltage, and recording the sum as the total voltage.
And the data judging module is used for judging whether the first voltage and the second voltage are zero or not to obtain a judging result.
And the result output module is used for calculating the resistance value of the positive insulation resistor and the resistance value of the negative insulation resistor based on the first voltage and/or the second voltage and the total voltage by combining the judging result.
In a third aspect, an embodiment of the present application provides a terminal device, including a processor and a memory, where the memory is configured to store a computer program, and the processor implements the method for measuring insulation resistance of a power device according to any one of the first aspects when executing the computer program.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the method for measuring insulation resistance of an electrical device according to any one of the first aspects.
It will be appreciated that the advantages of the second to fourth aspects may be found in the relevant description of the first aspect and are not repeated here.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
According to the application, the upper bridge arm of the Wheatstone bridge is connected with the positive end insulation resistor of the power equipment to be measured, the lower bridge arm of the Wheatstone bridge is connected with the negative end insulation resistor of the power equipment to be measured, and the connection point of the positive end insulation resistor and the negative end insulation resistor of the power equipment to be measured is used as a reference point, so that the voltage from the upper bridge arm sampling point of the Wheatstone bridge to the reference point (namely, the first voltage) and the voltage from the lower bridge arm sampling point of the Wheatstone bridge to the reference point (namely, the second voltage) can be obtained without power-off of the power equipment, and the sum (namely, the total voltage) of the voltages of the positive end insulation resistor and the negative end insulation resistor can be calculated through the first voltage and/or the second voltage, and the resistance of the positive end insulation resistor and the negative end insulation resistor can be calculated through the total voltage. The method of the scheme does not need to power off the power equipment, normal operation of the power equipment is not affected when the resistance value of the insulation resistance at two ends of the power equipment is measured, and further detection efficiency is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for measuring insulation resistance of an electrical device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a power device to be measured with a Wheatstone bridge connected thereto according to an embodiment of the present application;
FIG. 3 is an equivalent circuit diagram of K1 and K2 when simultaneously closed according to an embodiment of the present application;
FIG. 4 is an equivalent circuit diagram of K1 open and K2 closed according to an embodiment of the present application;
FIG. 5 is an equivalent circuit diagram of K1 closed and K2 open according to an embodiment of the present application;
FIG. 6 is a ACPL-C87BT linear optocoupler configuration circuit according to one embodiment of the present application;
FIG. 7 is a schematic diagram of a voltage detection module circuit according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a current detection module circuit according to an embodiment of the present application;
FIG. 9 is a schematic diagram of an insulation resistance measurement device for an electrical device according to an embodiment of the present application;
Fig. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The embodiment of the application provides a method for measuring insulation resistance of power equipment, which is applied to the power equipment to be measured, which is connected with a Wheatstone bridge, wherein an upper bridge arm of the Wheatstone bridge is connected with insulation resistance at the positive end of the power equipment to be measured, and a lower bridge arm of the Wheatstone bridge is connected with insulation resistance at the negative end of the power equipment to be measured. And taking a connection point of the positive insulation resistor and the negative insulation resistor of the power equipment to be measured as a reference point. Fig. 1 is a schematic flow chart of an insulation resistance measurement method of an electrical device according to an embodiment of the present application, and referring to fig. 1, the insulation resistance measurement method of the electrical device is described in detail as follows:
Step 101, obtaining the voltage from the upper bridge arm sampling point to the reference point and the voltage from the lower bridge arm sampling point to the reference point of the wheatstone bridge, and respectively recording the voltages as a first voltage and a second voltage.
Illustratively, as shown in FIG. 2, the Wheatstone bridge includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first switch K1, and a second switch K2, with a first end of a positive side insulation resistor R+ connected to a first end of a negative side insulation resistor R-.
The first end of the first resistor R1 is connected with the second end of the positive-end insulating resistor R+, the second end of the first resistor R1 is connected with the first end of the first switch K1, the second end of the first switch K1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is connected with the first end of the third resistor R3, the second end of the third resistor R3 is connected with the first end of the second switch K2, the second end of the second switch K2 is connected with the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is connected with the second end of the negative-end insulating resistor R-.
The reference point P is grounded and is also connected to the second terminal of the second resistor R2.
Specifically, the upper bridge arm sampling point is a connection point between the first switch K1 and the second resistor R2, and the lower bridge arm sampling point is a connection point between the second switch K2 and the third resistor R3.
Step 102, calculating the sum of the voltage of the positive insulation resistance and the voltage of the negative insulation resistance based on the first voltage and the second voltage, and recording as the total voltage.
Illustratively, step 102 may include:
the first switch K1 and the second switch K2 are controlled to be closed, and the sum of the voltage of the positive-end insulation resistor R+ and the voltage of the negative-end insulation resistor R < - > is calculated as the total voltage based on the first voltage and the second voltage and combined with a first formula as shown in fig. 3.
The first formula may be:
Wherein V Total (S) represents the total voltage, V 1 represents the first voltage, R 1 represents the resistance of the first resistor, R 2 represents the resistance of the second resistor, V 2 represents the second voltage, R 3 represents the resistance of the third resistor, and R 4 represents the resistance of the fourth resistor.
Specifically, in fig. 3, i 1 and i 2 represent currents flowing through the upper arm and the lower arm, respectively. The total voltage of the device under test can be calculated by the sum of the voltage between the positive terminal and point P and the voltage between the negative terminal and point P:
Step 103, judging whether the first voltage and the second voltage are zero, and obtaining a judging result.
Step 104, calculating the resistance of the positive insulation resistor and the resistance of the negative insulation resistor based on the first voltage and/or the second voltage and the total voltage according to the judging result.
Illustratively, step 104 may include:
If the first voltage and the second voltage are equal to zero, the resistance of the insulation resistor at the positive end is infinite, and the resistance of the insulation resistor at the negative end is infinite.
And controlling the first switch to be opened and the second switch to be closed, and calculating the resistance of the positive-end insulation resistor based on the total voltage and the second voltage.
And controlling the first switch to be closed and the second switch to be opened, and calculating the resistance of the insulation resistor of the negative terminal based on the total voltage and the first voltage.
If the first voltage and the second voltage are not equal to zero, the resistance of the positive insulation resistor and the resistance of the negative insulation resistor are calculated based on the voltage of the positive insulation resistor, the voltage of the negative insulation resistor, the first voltage and the second voltage.
Illustratively, calculating the resistance value of the positive-side insulation resistance based on the total voltage and the second voltage may include:
As shown in fig. 4, the resistance value of the positive-side insulation resistance is calculated based on the total voltage and the second voltage in combination with the second formula.
The second formula may be:
wherein, R + represents the resistance value of the positive-end insulation resistor, V Total (S) represents the total voltage, V 2 represents the second voltage, R 3 represents the resistance value of the third resistor, and R 4 represents the resistance value of the fourth resistor.
Specifically, when the resistance of the negative-side insulation resistor is infinite, the branch current existing in the negative-side insulation resistor can be considered to be 0.
Illustratively, calculating the resistance value of the negative terminal insulation resistance based on the total voltage and the first voltage may include:
as shown in fig. 5, the resistance value of the negative-side insulation resistance is calculated based on the total voltage and the first voltage in combination with the third formula.
The third formula may be:
Wherein R - represents the resistance value of the negative-side insulation resistor, V Total (S) represents the total voltage, V 1 represents the first voltage, R 1 represents the resistance value of the first resistor, and R 2 represents the resistance value of the second resistor.
Specifically, when the resistance of the positive-side insulation resistor is infinite, the branch current existing in the positive-side insulation resistor can be considered to be 0.
Illustratively, calculating the resistance of the positive side insulation resistance and the resistance of the negative side insulation resistance based on the voltage of the positive side insulation resistance, the voltage of the negative side insulation resistance, the first voltage, and the second voltage may include:
Based on the voltage of the positive end insulation resistor, the voltage of the negative end insulation resistor, the first voltage and the second voltage, the resistance of the positive end insulation resistor is calculated by combining a fourth formula, and the resistance of the negative end insulation resistor is calculated by combining a fifth formula.
The fourth equation may be:
The fifth formula may be:
Wherein, R + represents the resistance value of the positive-side insulation resistor, R - represents the resistance value of the negative-side insulation resistor, V + represents the voltage of the positive-side insulation resistor, V - represents the voltage of the negative-side insulation resistor, V 1 represents the first voltage, R 1 represents the resistance value of the first resistor, R 2 represents the resistance value of the second resistor, V 2 represents the second voltage, R 3 represents the resistance value of the third resistor, and R 4 represents the resistance value of the fourth resistor.
According to the method for measuring the insulation resistance of the power equipment, the upper bridge arm of the Wheatstone bridge is connected with the positive insulation resistance of the power equipment to be measured, the lower bridge arm of the Wheatstone bridge is connected with the negative insulation resistance of the power equipment to be measured, the connection point of the positive insulation resistance and the negative insulation resistance of the power equipment to be measured is used as a reference point, voltage from the upper bridge arm sampling point to the reference point (namely, first voltage) of the Wheatstone bridge and voltage from the lower bridge arm sampling point to the reference point (namely, second voltage) of the Wheatstone bridge can be obtained without power-off of the power equipment, and therefore the sum of the values of the voltage of the positive insulation resistance and the voltage of the negative insulation resistance (namely, total voltage) can be calculated through the first voltage and/or the second voltage, and the total voltage can be calculated. The method of the scheme does not need to power off the power equipment, normal operation of the power equipment is not affected when the resistance value of the insulation resistance at two ends of the power equipment is measured, and further detection efficiency is improved.
The measurement of the insulation resistance requires a hardware circuit as a support, and the insulation resistance measurement hardware is a precondition for ensuring the safe and efficient operation of the insulation resistance measurement. In the whole insulation monitoring system (MCU) design, hardware plays a crucial role, and related main modules comprise an isolation module, a voltage detection module and a current detection module. The voltage detection module is used for measuring the voltage of the positive end insulation resistor, the voltage of the negative end insulation resistor, the first voltage and the second voltage of the scheme.
1. And (3) designing an isolation module:
In the voltage sampling process, various interference signals possibly enter the main control chip together with the detected signals, so that the measurement accuracy is reduced, even the insulation monitoring system can not normally operate, and the safety of debugging personnel is endangered. Therefore, it is necessary to electrically isolate the circuit under test in the high voltage section from the processing circuit in the low voltage section effectively. Common analog isolation methods include transformer isolation, capacitive isolation, and opto-electrical isolation. The first two isolation modes have high cost, large occupied space, complex design and lower anti-interference capability.
The photoelectric isolation includes normal photoelectric coupling isolation and linear photoelectric coupling isolation. The linear optical coupler isolator has good input-output linear relation and is very suitable for analog signal isolation. Thus, as shown in FIG. 6, a linear optocoupler isolator, such as ACPL-C87BT, may be employed in the insulation monitoring system. The isolator adopts an advanced photoelectric coupling technology, and integrates a Sigma-Delta (Sigma-Delta) analog-digital converter, a chopper-stabilized amplifier and a fully differential circuit topological structure. The gain error is +/-0.5%, the recommended input voltage range is 0-2V, and the high-common-mode transient immunity of 15 kV/mu s is excellent, so that accurate and stable detection of direct-current voltage in a high-noise environment is ensured.
2. The voltage detection module:
Firstly, a voltage dividing circuit is used to reduce a high-voltage signal (the voltage of a positive-end insulation resistor, the voltage of a negative-end insulation resistor, a first voltage and a second voltage) (the four parameters are large voltage values in practical application, and when the voltage value is measured by the module, the voltage reduction processing is needed), then signal isolation is carried out through an isolation op amp ACPL-C87BT, and then signal conditioning is carried out. Meanwhile, the high-voltage part of the total voltage detection module needs to be independently powered. Fig. 7 shows a circuit diagram of the total pressure detection module.
3. And (3) designing a current detection module:
Two common methods of measuring current are the use of hall effect and current shunts. The invention designs a high-precision current detection device based on a current shunt so as to improve the precision of current detection and facilitate direct calculation through V Total (S) ＝|i1(R1+R2)|+|i2(R3+R4 I when calculating the total voltage. In order to ensure the functional safety, a redundant design is adopted in the design, and an open-loop Hall current sensor is combined.
The current through the shunt will create a voltage drop and subsequent circuitry will need to handle this small voltage signal. Since the shunt is mounted in the high voltage section and carries a large current, it must be isolated to effectively handle the small voltage drop created by the shunt. After isolation, since the voltage drop across the shunt is typically only tens of millivolts, directly inputting such a small voltage into the analog-to-digital converter (ADC) of the main control chip increases the measurement error. Therefore, this voltage needs to be amplified after isolation. The amplified signal is filtered by a signal conditioning circuit to improve the quality of the voltage signal.
The first step in the design of the current shunt circuit is to determine the type of shunt, and to select the shunt to use 75 mV/300A. The second step is to isolate the voltage signal from the shunt. The AMC1100 fully differential isolation amplifier with an input voltage range within hundreds of millivolts was selected in view of the small signal amplitude. AMC1100 was optimized for shunt resistors with very low non-linearity error, with a maximum non-linearity error of 0.075% at 5V supply. Further, the AMC1100 has a fixed gain of 8 times, so by using the AMC1100, it is possible to combine isolation and amplification circuits into one. The current signal processing circuit is shown in fig. 8.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
Corresponding to the method for measuring insulation resistance of electrical equipment described in the above embodiments, fig. 9 shows a block diagram of the apparatus for measuring insulation resistance of electrical equipment according to an embodiment of the present application, and for convenience of explanation, only the portion related to the embodiment of the present application is shown.
Referring to fig. 9, the device for measuring insulation resistance of electric equipment in the embodiment of the application is applied to electric equipment to be measured, which is connected with a wheatstone bridge, an upper bridge arm of the wheatstone bridge is connected with a positive insulation resistance of the electric equipment to be measured, a lower bridge arm of the wheatstone bridge is connected with a negative insulation resistance of the electric equipment to be measured, and a connection point of the positive insulation resistance and the negative insulation resistance of the electric equipment to be measured is taken as a reference point, wherein the device can comprise:
the data acquisition module 201 is configured to acquire a voltage from an upper bridge arm sampling point to a reference point and a voltage from a lower bridge arm sampling point to the reference point of the wheatstone bridge, which are respectively denoted as a first voltage and a second voltage.
The data calculation module 202 is configured to calculate, based on the first voltage and the second voltage, a sum of values of the voltage of the positive-side insulation resistance and the voltage of the negative-side insulation resistance, and record the sum as a total voltage.
The data determining module 203 is configured to determine whether the first voltage and the second voltage are zero, and obtain a determination result.
And a result output module 204, configured to calculate the resistance of the positive insulation resistor and the resistance of the negative insulation resistor based on the first voltage and/or the second voltage and the total voltage in combination with the determination result.
The Wheatstone bridge comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch and a second switch, wherein a first end of a positive end insulating resistor is connected with a first end of a negative end insulating resistor.
The first end of the first resistor is connected with the second end of the positive-end insulating resistor, the second end of the first resistor is connected with the first end of the first switch, the second end of the first switch is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the second switch, the second end of the second switch is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the second end of the negative-end insulating resistor.
The reference point is grounded and is also connected to the second end of the second resistor.
Illustratively, the data calculation module 202 may also be configured to:
and controlling the first switch and the second switch to be closed, and calculating the sum of the voltage of the positive-end insulation resistor and the voltage of the negative-end insulation resistor based on the first voltage and the second voltage and combining a first formula to be recorded as the total voltage.
The first formula may be:
Wherein V Total (S) represents the total voltage, V 1 represents the first voltage, R 1 represents the resistance of the first resistor, R 2 represents the resistance of the second resistor, V 2 represents the second voltage, R 3 represents the resistance of the third resistor, and R 4 represents the resistance of the fourth resistor.
Illustratively, the result output module 204 may also be configured to:
If the first voltage and the second voltage are equal to zero, the resistance of the insulation resistor at the positive end is infinite, and the resistance of the insulation resistor at the negative end is infinite.
And controlling the first switch to be opened and the second switch to be closed, and calculating the resistance of the positive-end insulation resistor based on the total voltage and the second voltage.
And controlling the first switch to be closed and the second switch to be opened, and calculating the resistance of the insulation resistor of the negative terminal based on the total voltage and the first voltage.
If the first voltage and the second voltage are not equal to zero, the resistance of the positive insulation resistor and the resistance of the negative insulation resistor are calculated based on the voltage of the positive insulation resistor, the voltage of the negative insulation resistor, the first voltage and the second voltage.
Illustratively, the result output module 204 may also be configured to:
and calculating the resistance of the positive insulation resistor by combining a second formula based on the total voltage and the second voltage.
The second formula may be:
wherein, R + represents the resistance value of the positive-end insulation resistor, V Total (S) represents the total voltage, V 2 represents the second voltage, R 3 represents the resistance value of the third resistor, and R 4 represents the resistance value of the fourth resistor.
Illustratively, the result output module 204 may also be configured to:
based on the total voltage and the first voltage, in combination with a third formula, the resistance of the negative terminal insulation resistance is calculated.
The third formula may be:
Wherein R - represents the resistance value of the negative-side insulation resistor, V Total (S) represents the total voltage, V 1 represents the first voltage, R 1 represents the resistance value of the first resistor, and R 2 represents the resistance value of the second resistor.
Illustratively, the result output module 204 may also be configured to:
Based on the voltage of the positive end insulation resistor, the voltage of the negative end insulation resistor, the first voltage and the second voltage, the resistance of the positive end insulation resistor is calculated by combining a fourth formula, and the resistance of the negative end insulation resistor is calculated by combining a fifth formula.
The fourth equation may be:
The fifth formula may be:
Wherein, R + represents the resistance value of the positive-side insulation resistor, R - represents the resistance value of the negative-side insulation resistor, V + represents the voltage of the positive-side insulation resistor, V - represents the voltage of the negative-side insulation resistor, V 1 represents the first voltage, R 1 represents the resistance value of the first resistor, R 2 represents the resistance value of the second resistor, V 2 represents the second voltage, R 3 represents the resistance value of the third resistor, and R 4 represents the resistance value of the fourth resistor.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
The embodiment of the present application further provides a terminal device, referring to fig. 10, the terminal device 300 may include at least one processor 310, a memory 320, where the memory 320 is configured to store a computer program 321, and the processor 310 is configured to invoke and execute the computer program 321 stored in the memory 320 to implement the steps in any of the foregoing method embodiments, for example, steps 101 to 104 in the embodiment shown in fig. 1. Or the processor 310, when executing the computer program, performs the functions of the modules/units in the above-described apparatus embodiments, for example, the functions of the modules shown in fig. 9.
By way of example, the computer program 321 may be partitioned into one or more modules/units that are stored in the memory 320 and executed by the processor 310 to complete the present application. The one or more modules/units may be a series of computer program segments capable of performing specific functions for describing the execution of the computer program in the terminal device 300.
It will be appreciated by those skilled in the art that fig. 10 is merely an example of a terminal device and is not limiting of the terminal device and may include more or fewer components than shown, or may combine certain components, or different components, such as input-output devices, network access devices, buses, etc.
The Processor 310 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 320 may be an internal storage unit of the terminal device, or may be an external storage device of the terminal device, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD), or the like. The memory 320 is used for storing the computer program and other programs and data required by the terminal device. The memory 320 may also be used to temporarily store data that has been output or is to be output.
The bus may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (PERIPHERAL COMPONENT, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, the buses in the drawings of the present application are not limited to only one bus or to one type of bus.
The method for measuring the insulation resistance of the power equipment, provided by the embodiment of the application, can be applied to terminal equipment such as computers, wearable equipment, vehicle-mounted equipment, tablet computers, notebook computers, netbooks and the like, and the specific type of the terminal equipment is not limited.
Embodiments of the present application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements steps in each embodiment of the above-described method for measuring insulation resistance of an electrical device.
Embodiments of the present application provide a computer program product which, when run on a mobile terminal, causes the mobile terminal to perform steps that enable the various embodiments of the method for measuring insulation resistance of electrical equipment described above to be implemented.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least any entity or device capable of carrying computer program code to a camera device/terminal equipment, a recording medium, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, and a software distribution medium. Such as a U-disk, removable hard disk, magnetic or optical disk, etc.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/network device and method may be implemented in other manners. For example, the apparatus/network device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The foregoing embodiments are merely illustrative of the technical solutions of the present application, and not restrictive, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that modifications may still be made to the technical solutions described in the foregoing embodiments or equivalent substitutions of some technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1.一种电力设备绝缘电阻测量方法，其特征在于，应用于连接有惠斯登电桥的待测量电力设备中，所述惠斯登电桥的上桥臂与所述待测量电力设备的正端绝缘电阻连接，所述惠斯登电桥的下桥臂与所述待测量电力设备的负端绝缘电阻连接；将所述待测量电力设备的正端绝缘电阻与负端绝缘电阻连接点作为参考点，所述方法包括：1. A method for measuring the insulation resistance of an electric power device, characterized in that the method is applied to an electric power device to be measured which is connected to a Wheatstone bridge, wherein the upper bridge arm of the Wheatstone bridge is connected to the positive insulation resistance of the electric power device to be measured, and the lower bridge arm of the Wheatstone bridge is connected to the negative insulation resistance of the electric power device to be measured; the connection point between the positive insulation resistance and the negative insulation resistance of the electric power device to be measured is used as a reference point, and the method comprises: 获取所述惠斯登电桥的上桥臂采样点到所述参考点的电压和下桥臂采样点到所述参考点的电压，分别记作第一电压和第二电压；Obtaining a voltage from an upper bridge arm sampling point to the reference point and a voltage from a lower bridge arm sampling point to the reference point of the Wheatstone bridge, which are recorded as a first voltage and a second voltage respectively; 基于所述第一电压和所述第二电压，计算所述正端绝缘电阻的电压和所述负端绝缘电阻的电压的数值之和，记作总电压；Based on the first voltage and the second voltage, calculating the sum of the voltage of the positive end insulation resistor and the voltage of the negative end insulation resistor, and recording it as a total voltage; 判断所述第一电压和所述第二电压是否为零，得到判断结果；Determine whether the first voltage and the second voltage are zero, and obtain a determination result; 结合所述判断结果，基于所述第一电压和/或所述第二电压，以及所述总电压，计算所述正端绝缘电阻的阻值和所述负端绝缘电阻的阻值。In combination with the judgment result, based on the first voltage and/or the second voltage, and the total voltage, the resistance value of the positive terminal insulation resistance and the resistance value of the negative terminal insulation resistance are calculated. 2.如权利要求1所述的电力设备绝缘电阻测量方法，其特征在于，所述惠斯登电桥包括：第一电阻、第二电阻、第三电阻、第四电阻、第一开关和第二开关；所述正端绝缘电阻的第一端与所述负端绝缘电阻的第一端连接；2. The method for measuring the insulation resistance of electric power equipment according to claim 1, wherein the Wheatstone bridge comprises: a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch and a second switch; the first end of the positive insulation resistor is connected to the first end of the negative insulation resistor; 所述第一电阻的第一端与所述正端绝缘电阻的第二端连接，所述第一电阻的第二端与所述第一开关的第一端连接，所述第一开关的第二端与所述第二电阻的第一端连接，所述第二电阻的第二端与所述第三电阻的第一端连接，所述第三电阻的第二端与所述第二开关的第一端连接，所述第二开关的第二端与所述第四电阻的第一端连接，所述第四电阻的第二端与所述负端绝缘电阻的第二端连接；The first end of the first resistor is connected to the second end of the positive-end insulation resistor, the second end of the first resistor is connected to the first end of the first switch, the second end of the first switch is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the second switch, the second end of the second switch is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the second end of the negative-end insulation resistor; 所述参考点接地，所述参考点还与所述第二电阻的第二端连接。The reference point is grounded and is also connected to the second end of the second resistor. 3.如权利要求2所述的电力设备绝缘电阻测量方法，其特征在于，所述基于所述第一电压和所述第二电压，计算所述正端绝缘电阻的电压和所述负端绝缘电阻的电压的数值之和，记作总电压，包括：3. The method for measuring the insulation resistance of electric power equipment according to claim 2, characterized in that the sum of the voltage of the positive terminal insulation resistance and the voltage of the negative terminal insulation resistance is calculated based on the first voltage and the second voltage, and recorded as the total voltage, comprising: 控制所述第一开关和所述第二开关闭合，基于所述第一电压和所述第二电压，结合第一公式，计算所述正端绝缘电阻的电压和所述负端绝缘电阻的电压的数值之和，记作总电压；Control the first switch and the second switch to be closed, and based on the first voltage and the second voltage, calculate the sum of the voltage of the positive end insulation resistor and the voltage of the negative end insulation resistor in combination with a first formula, and record it as a total voltage; 所述第一公式为：The first formula is: 其中，V总表示所述总电压，V1表示所述第一电压，R1表示所述第一电阻的阻值，R2表示所述第二电阻的阻值，V2表示所述第二电压，R3表示所述第三电阻的阻值，R4表示所述第四电阻的阻值。Among them, Vtotal represents the total voltage, V1 represents the first voltage, R1 represents the resistance value of the first resistor, R2 represents the resistance value of the second resistor, V2 represents the second voltage, R3 represents the resistance value of the third resistor, and R4 represents the resistance value of the fourth resistor. 4.如权利要求2所述的电力设备绝缘电阻测量方法，其特征在于，所述结合所述判断结果，基于所述第一电压和/或所述第二电压，以及所述总电压，计算所述正端绝缘电阻的阻值和所述负端绝缘电阻的阻值，包括：4. The method for measuring insulation resistance of electric power equipment according to claim 2, characterized in that the step of calculating the resistance value of the positive terminal insulation resistance and the resistance value of the negative terminal insulation resistance based on the first voltage and/or the second voltage and the total voltage in combination with the judgment result comprises: 若所述第一电压和所述第二电压均等于零，则所述正端绝缘电阻的阻值无穷大，所述负端绝缘电阻的阻值无穷大；If the first voltage and the second voltage are both equal to zero, the resistance value of the positive terminal insulation resistance is infinite, and the resistance value of the negative terminal insulation resistance is infinite; 若所述第一电压等于零，所述第二电压不等于零，则所述负端绝缘电阻的阻值无穷大；控制所述第一开关断开，所述第二开关闭合，基于所述总电压和所述第二电压，计算所述正端绝缘电阻的阻值；If the first voltage is equal to zero and the second voltage is not equal to zero, the resistance value of the negative terminal insulation resistance is infinite; control the first switch to be opened and the second switch to be closed, and calculate the resistance value of the positive terminal insulation resistance based on the total voltage and the second voltage; 若所述第一电压不等于零，所述第二电压等于零，则所述正端绝缘电阻的阻值无穷大；控制所述第一开关闭合，所述第二开关断开，基于所述总电压和所述第一电压，计算所述负端绝缘电阻的阻值；If the first voltage is not equal to zero and the second voltage is equal to zero, the resistance value of the positive terminal insulation resistance is infinite; the first switch is controlled to be closed and the second switch is opened, and the resistance value of the negative terminal insulation resistance is calculated based on the total voltage and the first voltage; 若所述第一电压和所述第二电压均不等于零，则基于所述正端绝缘电阻的电压、所述负端绝缘电阻的电压、所述第一电压和所述第二电压，计算所述正端绝缘电阻的阻值和所述负端绝缘电阻的阻值。If both the first voltage and the second voltage are not equal to zero, the resistance value of the positive end insulation resistor and the resistance value of the negative end insulation resistor are calculated based on the voltage of the positive end insulation resistor, the voltage of the negative end insulation resistor, the first voltage and the second voltage. 5.如权利要求4所述的电力设备绝缘电阻测量方法，其特征在于，所述基于所述总电压和所述第二电压，计算所述正端绝缘电阻的阻值，包括：5. The method for measuring insulation resistance of electric power equipment according to claim 4, wherein the calculation of the resistance value of the positive terminal insulation resistance based on the total voltage and the second voltage comprises: 基于所述总电压和所述第二电压，结合第二公式，计算所述正端绝缘电阻的阻值；Based on the total voltage and the second voltage, in combination with a second formula, calculating the resistance value of the positive terminal insulation resistance; 所述第二公式为：The second formula is: 其中，R+表示所述正端绝缘电阻的阻值，V总表示所述总电压，V2表示所述第二电压，R3表示所述第三电阻的阻值，R4表示所述第四电阻的阻值。Among them, R + represents the resistance of the positive end insulation resistor, Vtotal represents the total voltage, V2 represents the second voltage, R3 represents the resistance of the third resistor, and R4 represents the resistance of the fourth resistor. 6.如权利要求4所述的电力设备绝缘电阻测量方法，其特征在于，所述基于所述总电压和所述第一电压，计算所述负端绝缘电阻的阻值，包括：6. The method for measuring insulation resistance of electric power equipment according to claim 4, wherein the step of calculating the resistance value of the negative terminal insulation resistance based on the total voltage and the first voltage comprises: 基于所述总电压和所述第一电压，结合第三公式，计算所述负端绝缘电阻的阻值；Based on the total voltage and the first voltage, in combination with a third formula, calculating the resistance value of the negative terminal insulation resistance; 所述第三公式为：The third formula is: 其中，R-表示所述负端绝缘电阻的阻值，V总表示所述总电压，V1表示所述第一电压，R1表示所述第一电阻的阻值，R2表示所述第二电阻的阻值。Wherein, R- represents the resistance value of the negative end insulation resistor, Vtotal represents the total voltage, V1 represents the first voltage, R1 represents the resistance value of the first resistor, and R2 represents the resistance value of the second resistor. 7.如权利要求4所述的电力设备绝缘电阻测量方法，其特征在于，所述基于所述正端绝缘电阻的电压、所述负端绝缘电阻的电压、所述第一电压和所述第二电压，计算所述正端绝缘电阻的阻值和所述负端绝缘电阻的阻值，包括：7. The method for measuring the insulation resistance of electric power equipment according to claim 4, characterized in that the calculation of the resistance value of the positive terminal insulation resistance and the resistance value of the negative terminal insulation resistance based on the voltage of the positive terminal insulation resistance, the voltage of the negative terminal insulation resistance, the first voltage and the second voltage comprises: 基于所述正端绝缘电阻的电压、所述负端绝缘电阻的电压、所述第一电压和所述第二电压，结合第四公式计算所述正端绝缘电阻的阻值，结合第五公式计算所述负端绝缘电阻的阻值；Based on the voltage of the positive terminal insulation resistor, the voltage of the negative terminal insulation resistor, the first voltage and the second voltage, the resistance value of the positive terminal insulation resistor is calculated in combination with the fourth formula, and the resistance value of the negative terminal insulation resistor is calculated in combination with the fifth formula; 所述第四公式为：The fourth formula is: 所述第五公式为：The fifth formula is: 其中，R+表示所述正端绝缘电阻的阻值，R-表示所述负端绝缘电阻的阻值，V+表示所述正端绝缘电阻的电压，V-表示所述负端绝缘电阻的电压，V1表示所述第一电压，R1表示所述第一电阻的阻值，R2表示所述第二电阻的阻值，V2表示所述第二电压，R3表示所述第三电阻的阻值，R4表示所述第四电阻的阻值。Among them, R + represents the resistance of the positive end insulation resistor, R- represents the resistance of the negative end insulation resistor, V + represents the voltage of the positive end insulation resistor, V- represents the voltage of the negative end insulation resistor, V1 represents the first voltage, R1 represents the resistance of the first resistor, R2 represents the resistance of the second resistor, V2 represents the second voltage, R3 represents the resistance of the third resistor, and R4 represents the resistance of the fourth resistor. 8.一种电力设备绝缘电阻测量装置，其特征在于，应用于连接有惠斯登电桥的待测量电力设备中，所述惠斯登电桥的上桥臂与所述待测量电力设备的正端绝缘电阻连接，所述惠斯登电桥的下桥臂与所述待测量电力设备的负端绝缘电阻连接；将所述待测量电力设备的正端绝缘电阻与负端绝缘电阻连接点作为参考点，所述装置包括：8. An insulation resistance measuring device for electric power equipment, characterized in that it is applied to an electric power equipment to be measured connected with a Wheatstone bridge, wherein the upper bridge arm of the Wheatstone bridge is connected to the positive insulation resistance of the electric power equipment to be measured, and the lower bridge arm of the Wheatstone bridge is connected to the negative insulation resistance of the electric power equipment to be measured; the connection point between the positive insulation resistance and the negative insulation resistance of the electric power equipment to be measured is used as a reference point, and the device comprises: 数据获取模块，用于获取所述惠斯登电桥的上桥臂采样点到所述参考点的电压和下桥臂采样点到所述参考点的电压，分别记作第一电压和第二电压；A data acquisition module, used to acquire a voltage from a sampling point of an upper bridge arm to the reference point and a voltage from a sampling point of a lower bridge arm to the reference point of the Wheatstone bridge, which are recorded as a first voltage and a second voltage respectively; 数据计算模块，用于基于所述第一电压和所述第二电压，计算所述正端绝缘电阻的电压和所述负端绝缘电阻的电压的数值之和，记作总电压；A data calculation module, used for calculating the sum of the voltage of the positive end insulation resistance and the voltage of the negative end insulation resistance based on the first voltage and the second voltage, and recording it as a total voltage; 数据判断模块，用于判断所述第一电压和所述第二电压是否为零，得到判断结果；A data judgment module, used for judging whether the first voltage and the second voltage are zero, and obtaining a judgment result; 结果输出模块，用于结合所述判断结果，基于所述第一电压和/或所述第二电压，以及所述总电压，计算所述正端绝缘电阻的阻值和所述负端绝缘电阻的阻值。A result output module is used to calculate the resistance value of the positive terminal insulation resistance and the resistance value of the negative terminal insulation resistance based on the first voltage and/or the second voltage and the total voltage in combination with the judgment result. 9.一种终端设备，包括：处理器和存储器，所述存储器中存储有可在所述处理器上运行的计算机程序，其特征在于，所述处理器执行所述计算机程序时实现如权利要求1至7任一项所述的电力设备绝缘电阻测量方法。9. A terminal device, comprising: a processor and a memory, wherein the memory stores a computer program that can be run on the processor, wherein when the processor executes the computer program, the method for measuring the insulation resistance of an electric power equipment as described in any one of claims 1 to 7 is implemented. 10.一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，其特征在于，所述计算机程序被处理器执行时实现如权利要求1至7任一项所述的电力设备绝缘电阻测量方法。10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the method for measuring insulation resistance of electric power equipment according to any one of claims 1 to 7.
CN202411174143.4A 2024-08-26 2024-08-26 Method, device, equipment and storage medium for measuring insulation resistance of power equipment Pending CN119044605A (en)

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CN108614158A (en) * 2018-06-15 2018-10-02 郑州轻工业学院 A kind of electric automobile insulation resistance detection control circuit and its detection method
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