CN113533828B - Detection device and power supply system of power supply circuit of three-phase motor - Google Patents
Detection device and power supply system of power supply circuit of three-phase motor Download PDFInfo
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- CN113533828B CN113533828B CN202110924859.1A CN202110924859A CN113533828B CN 113533828 B CN113533828 B CN 113533828B CN 202110924859 A CN202110924859 A CN 202110924859A CN 113533828 B CN113533828 B CN 113533828B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
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Abstract
The application discloses a detection device and a power supply system of a power supply circuit of a three-phase motor, wherein the detection device comprises a first output voltage detection module, a second output voltage detection module and a third output voltage detection module which are used for respectively detecting output voltages of the three-phase circuit of an output end of the three-phase motor, and the output states of the three-phase power supply switch are considered to be related to the on-off states of the three-phase power supply switch, so that the first processing module can determine the output end states of the three-phase power supply switch based on the three-phase output voltages acquired by the three output voltage detection modules and control instructions of the three-phase power supply switch, and reliable detection of the output end states of the three-phase power supply switch is realized.
Description
Technical Field
The application relates to the technical field of circuit detection, in particular to a detection device and a power supply system of a power supply circuit of a three-phase motor.
Background
The railway turnout of the high-speed magnetic levitation traffic system adopts an integral movable steel box girder design, and the turnout is driven by a three-phase motor to be integrally turned and removed. The safety power supply and cut-off of the three-phase motor are related to the accuracy of the turnout movement and the safety of the train operation, so how to reliably detect the power supply circuit of the three-phase motor becomes important.
Disclosure of Invention
The application aims to provide a detection device and a power supply system for a power supply circuit of a three-phase motor, which realize reliable detection of the state of an output end of a three-phase power supply switch.
In order to solve the technical problem, the present application provides a detection device for a power supply circuit of a three-phase motor, wherein an input end of the power supply circuit is connected with an ac power supply, an output end of the power supply circuit is connected with a three-phase power supply switch of the three-phase motor, and the detection device comprises:
The first output voltage detection module is connected with a first phase of the output end of the three-phase power supply switch and is used for detecting an output voltage signal of the first phase;
the second output voltage detection module is connected with a second phase of the output end of the three-phase power supply switch and is used for detecting an output voltage signal of the second phase;
the third output voltage detection module is connected with a third phase of the output end of the three-phase power supply switch and is used for detecting an output voltage signal of the third phase;
The switch control module is connected with the control end of the three-phase power supply switch and is used for outputting a control instruction to the three-phase power supply switch so as to control the three-phase power supply switch to be closed or opened;
The first processing module is used for determining the output end state of the three-phase power supply switch based on the control instruction, the output voltage signal of the first phase, the output voltage signal of the second phase and the output voltage signal of the third phase.
Preferably, the first output voltage detection module is a first output voltage detection relay, the second output voltage detection module is a second output voltage detection relay, and the third output voltage detection module is a third output voltage detection relay;
One end of a coil of the first output voltage detection relay is connected with a first phase of an output end of the three-phase power supply switch, and the other end of the coil of the first output voltage detection relay is grounded; one end of a coil of the second output voltage detection relay is connected with a second phase of the output end of the three-phase power supply switch, and the other end of the coil of the second output voltage detection relay is grounded; one end of a coil of the third output voltage detection relay is connected with a third phase of the output end of the three-phase power supply switch, and the other end of the coil of the third output voltage detection relay is grounded.
Preferably, the three-phase power supply switch is a three-phase power supply contactor, the input end of a normally open contact of the three-phase power supply contactor is connected with the alternating current power supply, and the output end of the normally open contact is connected with the three-phase motor;
the switch control module comprises a control switch, wherein the control switch is arranged on a power supply loop of a coil of the three-phase power supply contactor and is used for controlling power obtaining and losing of the coil of the three-phase power supply contactor through on-off of the control switch.
Preferably, the switch control module further comprises a coil of a control state relay connected with the control switch, and the first processing module comprises a first output detection module and a second output detection module;
The direct-current power supply positive end, the normally open contact of the first output voltage detection relay, the normally open contact of the second output voltage detection relay and the first end of the normally open contact of the third output voltage detection relay are sequentially connected in series;
The direct-current power supply positive end, the normally-closed contact of the first output voltage detection relay, the normally-closed contact of the second output voltage detection relay and the first end of the normally-closed contact of the third output voltage detection relay are sequentially connected in series;
The first output detection module is used for detecting a first output voltage between the second end of the normally open contact of the third output voltage detection relay and a grounding point;
the second output detection module is used for detecting a second output voltage between a second end of the normally-closed contact of the control state relay and a grounding point so as to determine the state of the output end of the three-phase power supply switch based on the first output voltage and the second output voltage.
Preferably, the first processing module further comprises a first output detection relay with a forced guiding contact and a second output detection relay with a forced guiding contact;
A first end of a coil of the first output detection relay is connected with a second end of a normally open contact of the third output voltage detection relay, and the second end is connected with a grounding point;
The first end of the coil of the second output detection relay is connected with the second end of the normally closed contact of the control state relay, and the second end is connected with a grounding point;
The first end of the normally-closed contact of the first output detection relay is connected with the positive end of the direct-current power supply, and the second end of the normally-closed contact of the second output detection relay is connected with the first end of the normally-open contact of the second output detection relay;
the first end of the normally open contact of the first output detection relay is connected with the positive end of the direct current power supply, and the second end of the normally open contact of the first output detection relay is connected with the first end of the normally closed contact of the second output detection relay;
Correspondingly, the first output detection module is specifically configured to detect a first output voltage between a second end of a normally open contact of the second output detection relay and a ground point;
The second output detection module is used for detecting a second output voltage between a second end of a normally-closed contact of the second output detection relay and a grounding point so as to determine the output end state of the three-phase power supply switch based on the first output voltage and the second output voltage.
Preferably, the method further comprises:
the first input voltage detection module is connected with a first phase of the input end of the three-phase power supply switch and is used for detecting an input voltage signal of the first phase;
the second input voltage detection module is connected with a second phase of the input end of the three-phase power supply switch and is used for detecting an input voltage signal of the second phase;
the third input voltage detection module is connected with a third phase of the input end of the three-phase power supply switch and is used for detecting an input voltage signal of the third phase;
and the second processing module is used for determining the input end state of the three-phase power supply switch based on the input voltage signal of the first phase, the input voltage signal of the second phase and the input voltage signal of the third phase.
Preferably, the first input voltage detection module is a first input detection voltage detection relay, the second input voltage detection module is a second input detection voltage detection relay, and the third input voltage detection module is a third input detection voltage detection relay;
One end of a coil of the first input voltage detection relay is connected with a first phase of an input end of the three-phase power supply switch, and the other end of the coil of the first input voltage detection relay is grounded; one end of a coil of the second input voltage detection relay is connected with a second phase of the input end of the three-phase power supply switch, and the other end of the coil of the second input voltage detection relay is grounded; one end of a coil of the third input voltage detection relay is connected with a third phase of the input end of the three-phase power supply switch, and the other end of the coil of the third input voltage detection relay is grounded.
Preferably, the second processing module comprises a first input detection module and a second input detection module;
The direct-current power supply positive end, the normally open contact of the first input voltage detection relay, the normally open contact of the second input voltage detection relay and the first end of the normally open contact of the third input voltage detection relay are sequentially connected in series;
The direct-current power supply positive end, the normally-closed contact of the first input voltage detection relay, the normally-closed contact of the second input voltage detection relay and the first end of the normally-closed contact of the third input voltage detection relay are sequentially connected in series;
The first input detection module is used for detecting a first input voltage between the second end of the normally open contact of the third input voltage detection relay and a grounding point;
The second input detection module is used for detecting a second input voltage between a second end of a normally-closed contact of the third input voltage detection relay and a grounding point so as to determine the input end state of the three-phase power supply switch based on the first input voltage and the second input voltage.
Preferably, the second processing module further comprises a first input detection relay with a forced guiding contact and a second input detection relay with a forced guiding contact;
A first end of a coil of the first input detection relay is connected with a second end of a normally open contact of the third input voltage detection relay, and the second end is connected with a grounding point;
the first end of the coil of the second input detection relay is connected with the second end of the normally-closed contact of the third input voltage detection relay, and the second end is connected with a grounding point;
The first end of the normally closed contact of the first input detection relay is connected with the positive end of the direct current power supply, and the second end of the normally closed contact of the first input detection relay is connected with the first end of the normally open contact of the second input detection relay;
The first end of the normally closed contact of the first input detection relay is connected with the positive end of the direct current power supply, and the second end of the normally closed contact of the first input detection relay is connected with the first end of the normally open contact of the second input detection relay;
The first input detection module is used for detecting a first input voltage between a second end of a normally open contact of the second input detection relay and a grounding point;
the second input detection module is used for detecting a second input voltage between a second end of a normally-closed contact of the second input detection relay and a grounding point so as to determine the input end state of the three-phase power supply switch based on the first input voltage and the second input voltage.
In order to solve the technical problem, the application also provides a power supply system of the three-phase motor, which comprises a three-phase power supply switch, a detection device and a control device, wherein the input end of the three-phase power supply switch is connected with an alternating current power supply, and the output end of the three-phase power supply switch is connected with the three-phase motor.
The application provides a detection device and a power supply system of a power supply circuit of a three-phase motor, wherein the detection device comprises a first output voltage detection module, a second output voltage detection module and a third output voltage detection module which are used for respectively detecting output voltages of the three-phase circuit of an output end of the three-phase motor, and the output states of the three-phase power supply switch are considered to be related to the on or off states of the three-phase power supply switch, so that the first processing module can determine the output end states of the three-phase power supply switch based on the three-phase output voltages acquired by the three output voltage detection modules and control instructions of the three-phase power supply switch, and reliable detection of the output end states of the three-phase power supply switch is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a detection device of a power supply circuit of a three-phase motor according to the present application;
Fig. 2 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor according to the present application;
fig. 3 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor when a three-phase power supply switch is closed;
Fig. 4 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor when a three-phase power supply switch provided by the application is disconnected;
Fig. 5 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor when three-phase power sources exist in the application;
fig. 6 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor when no three-phase power supply exists.
Detailed Description
The application provides a detection device and a power supply system of a power supply circuit of a three-phase motor, which realize reliable detection of the state of an output end of a three-phase power supply switch.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a detection device for a power supply circuit of a three-phase motor according to the present application.
The detection device comprises a three-phase power supply switch KM, wherein an input end of the three-phase power supply switch KM is arranged on a power supply circuit and connected with an alternating current power supply, and an output end of the three-phase power supply switch KM is connected with a three-phase motor, and the detection device comprises:
the first output voltage detection module L1B is connected with a first phase of the output end of the three-phase power supply switch KM and is used for detecting an output voltage signal of the first phase;
the second output voltage detection module L2B is connected with a second phase of the output end of the three-phase power supply switch KM and is used for detecting an output voltage signal of the second phase;
The third output voltage detection module L3B is connected with a third phase of the output end of the three-phase power supply switch KM and is used for detecting an output voltage signal of the third phase;
the switch control module 1 is connected with the control end of the three-phase power supply switch KM and is used for outputting a control instruction to the three-phase power supply switch KM so as to control the three-phase power supply switch KM to be closed or opened;
the first processing module 2 is configured to determine an output terminal state of the three-phase power supply switch KM based on the control instruction, the output voltage signal of the first phase, the output voltage signal of the second phase, and the output voltage signal of the third phase.
The three-phase power supply supplies power to the three-phase motor through the three-phase power supply switch KM, and the three-phase motor is powered and drives the turnout to move when receiving a motor control instruction.
Specifically, considering that a circuit in which the three-phase power supply switch KM is located is a large-voltage and large-current circuit, in order to avoid the problem of low safety caused by manual direct control of the three-phase power supply switch KM, in the application, the detection device comprises a switch control module 1, and the three-phase power supply switch KM is controlled through the switch control module 1. The switch control module 1 is configured to output a corresponding control instruction to the three-phase power supply switch KM according to a user instruction, where the control instruction includes a closing control instruction and an opening control instruction, and the three-phase power supply switch KM is closed when receiving the closing control instruction and opened when receiving the opening control instruction. When the three-phase power supply switch KM is closed, theoretically, three phases of the output end of the three-phase power supply switch KM are provided with alternating current; when the three-phase power supply switch KM is turned off, theoretically, there is no ac power on three phases at the output end of the three-phase power supply switch KM. It can be seen that the output state of the three-phase power supply switch KM may be determined based on the control command, the output voltage signal of the first phase, the output voltage signal of the second phase, and the output voltage signal of the third phase.
Based on this, in the present application, the detection device further includes a first output voltage detection module L1B, a second output voltage detection module L2B, a third output voltage detection module L3B, and a first processing module 2, where the first output voltage detection module L1B is configured to detect an output voltage signal of the first phase, the second output voltage detection module L2B is configured to detect an output voltage signal of the second phase, the third output voltage detection module L3B is configured to detect an output voltage signal of the third phase, and the first processing module 2 ultimately determines an output end state of the three-phase power supply switch KM based on the control command, the output voltage signal of the first phase, the output voltage signal of the second phase, and the output voltage signal of the third phase, where the output end state includes that three-phase power is all present (at this time, the three-phase power supply switch KM is closed), that the power supply fault or the lack of equality is not present (at this time).
Therefore, the detection device and the power supply system of the power supply circuit of the three-phase motor can determine the output end state of the three-phase power supply switch KM based on the three-phase output voltages collected by the three output voltage detection modules and the control instruction of the three-phase power supply switch KM, and realize reliable detection of the output end state of the three-phase power supply switch KM.
Based on the above embodiments:
Referring to fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, fig. 2 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor according to the present application, fig. 3 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor according to the present application when a three-phase power supply switch is turned on, fig. 4 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor according to the present application when a three-phase power supply switch is turned off, fig. 5 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor according to the present application when a three-phase power supply is present, and fig. 6 is a schematic diagram of a part of a detection device of a power supply circuit of a three-phase motor according to the present application when a three-phase power supply is not present.
As a preferred embodiment, the first output voltage detection module L1B is a first output voltage detection relay, the second output voltage detection module L2B is a second output voltage detection relay, and the third output voltage detection module L3B is a third output voltage detection relay;
One end of a coil of the first output voltage detection relay is connected with a first phase of an output end of the three-phase power supply switch KM, and the other end of the coil is grounded; one end of a coil of the second output voltage detection relay is connected with a second phase of the output end of the three-phase power supply switch KM, and the other end of the coil is grounded; one end of a coil of the third output voltage detection relay is connected with a third phase of the output end of the three-phase power supply switch KM, and the other end of the coil is grounded.
Specifically, in the application, the first output voltage detection module L1B, the second output voltage detection module L2B and the third output voltage detection module L3B are all relays, when alternating current exists on a three-phase circuit at the output end of the three-phase power supply switch KM, the coil of the relay is electrified, the contact of the relay performs corresponding actions, when no alternating current exists on the three-phase circuit at the output end of the three-phase power supply switch KM, the coil of the relay is electrified, and the contact of the relay performs corresponding actions.
Therefore, whether the three-phase circuit at the output end of the three-phase power supply switch KM has alternating current or not can be reflected through the action of the contact of the relay, and reliable detection of whether the three-phase circuit at the output end of the three-phase power supply switch KM has alternating current or not is realized.
As a preferred embodiment, the three-phase power supply switch KM is a three-phase power supply contactor, an input end of a normally open contact of the three-phase power supply contactor is connected with an ac power supply, and an output end of the normally open contact is connected with a three-phase motor;
The switch control module 1 comprises a control switch N, wherein the control switch N is arranged on a power supply loop of a coil of the three-phase power supply contactor and is used for controlling power loss of the coil of the three-phase power supply contactor through on-off of the control switch N.
First, in the present application, the normally open contact refers to a contact in which a corresponding coil is in an open state in a normal state (not energized), and the normally closed contact refers to a contact in which a corresponding coil is in a closed state in a normal state (not energized).
In the application, the control of the three-phase power supply contactor is realized through the control switch N, specifically, the control switch N is arranged in a power supply loop of a coil of the three-phase power supply contactor, when the control switch N is closed, the coil of the three-phase power supply contactor is electrified, a normally open contact of the three-phase power supply contactor is closed, and the three-phase motor is electrified; when the control switch N is opened, the coil of the three-phase power supply contactor is powered off, the normally open contact of the three-phase power supply contactor is opened, and the three-phase motor is powered off.
In this way, the three-phase power supply switch KM can be controlled safely and controllably.
As a preferred embodiment, the switch control module 1 further comprises a coil of a control state relay RA connected to the control switch N, and the first processing module 2 comprises a first output detection module and a second output detection module;
The direct current power supply DC positive end, the normally open contact of the first output voltage detection relay, the normally open contact of the second output voltage detection relay and the first end of the normally open contact of the third output voltage detection relay are sequentially connected in series;
the direct current power supply DC positive end, the normally closed contact of the first output voltage detection relay, the normally closed contact of the second output voltage detection relay and the first end of the normally closed contact of the third output voltage detection relay are sequentially connected in series;
The first output detection module is used for detecting a first output voltage between the second end of the normally open contact of the third output voltage detection relay and a grounding point;
The second output detection module is used for detecting a second output voltage between a second end of the normally closed contact of the control state relay RA and a grounding point so as to determine the output end state of the three-phase power supply switch KM based on the first output voltage and the second output voltage.
In the application, the first output voltage detection relay, the second output voltage detection relay and the third output voltage detection relay all comprise normally open contacts and normally closed contacts. Specifically, the normally open contact of the first output voltage detection relay, the normally open contact of the second output voltage detection relay and the normally open contact of the third output voltage detection relay are sequentially connected in series, and the normally closed contact of the first output voltage detection relay, the normally closed contact of the second output voltage detection relay, the normally closed contact of the third output voltage detection relay and the normally closed contact of the control state relay RA are sequentially connected in series.
The method comprises the steps that when a three-phase power supply, a first output voltage detection relay, a second output voltage detection relay and a third output voltage detection relay are normal and have no faults, if a three-phase power supply switch KM is closed, normally open contacts of the first output voltage detection relay, the second output voltage detection relay and the third output voltage detection relay are closed, normally closed contacts are opened, at the moment, the first output voltage detected by a first output detection module is the direct current voltage of a direct current power supply DC, and the second output voltage detected by a second output detection module is 0V; if the three-phase power supply switch KM is turned off, at this time, the normally open contacts of the first output voltage detection relay, the second output voltage detection relay and the third output voltage detection relay are turned off, the normally closed contacts are turned on, the normally closed contacts of the control state relay RA are turned on, at this time, the first output voltage detected by the first output detection module is 0V, and the second output voltage detected by the second output detection module is the direct current voltage of the direct current power supply DC.
In practical application, if the situation that the first output voltage detected by the first output detection module and the second output voltage detected by the second output detection module are both direct-current voltages occurs, it is indicated that a relay fault, such as contact damage, may occur at this time. If the first output voltage detected by the first output detection module and the second output voltage detected by the second output detection module are both 0V, the situation that three-phase power failure, such as phase failure or relay failure, occurs at the moment is indicated.
Therefore, the output end state of the three-phase power supply switch KM can be reliably detected in this way.
As a preferred embodiment, the first processing module 2 further comprises a first output detection relay KB1 with forced guiding contacts and a second output detection relay KB2 with forced guiding contacts;
the first end of the coil of the first output detection relay KB1 is connected with the second end of the normally open contact of the third output voltage detection relay, and the second end is connected with a grounding point;
the first end of the coil of the second output detection relay KB2 is connected with the second end of the normally closed contact of the control state relay RA, and the second end is connected with a grounding point;
The first end of the normally closed contact of the first output detection relay KB1 is connected with the DC positive end of the direct current power supply, and the second end of the normally open contact of the second output detection relay KB2 is connected with the first end of the normally open contact;
the first end of the normally open contact of the first output detection relay KB1 is connected with the DC positive end of the direct current power supply, and the second end of the normally closed contact of the second output detection relay KB2 is connected with the first end of the normally closed contact;
Correspondingly, the first output detection module is specifically configured to detect a first output voltage between the second end of the normally open contact of the second output detection relay KB2 and the ground point;
The second output detection module is used for detecting a second output voltage between a second end of the normally-closed contact of the second output detection relay KB2 and a grounding point so as to determine the output end state of the three-phase power supply switch KM based on the first output voltage and the second output voltage.
In order to further improve the safety and reliability of the detection of the power supply circuit, in the present application, the first processing module 2 further includes a first output detection relay KB1 with forced guiding contacts and a second output detection relay KB2 with forced guiding contacts. The first output voltage detected by the first output detection module and the second output voltage detected by the second output detection module are as follows:
TABLE 1 output side State logic Table
It should be noted that, when the first output voltage detected by the first output detection module is a dc voltage, sd_b is high, and when the first output voltage detected by the first output detection module is 0V, sd_b is low; when the second output voltage detected by the second output detection module is a direct current voltage,/sd_b is high, and when the second output voltage detected by the second output detection module is 0V,/sd_b is low.
Therefore, the output end state of the three-phase power supply switch KM can be reliably detected in the mode, in addition, as the normally open contact and the normally closed contact of the common relay cannot ensure that the states are always opposite, if the common relay generates faults, misjudgment can be caused on detection, and in the application, the first output detection relay KB1 and the second output detection relay KB2 are provided with forced guide contacts, and after the logic of the relay with the fault guide contacts is added, most misjudgment can be shielded, so that the result accuracy is higher and the safety is high.
As a preferred embodiment, further comprising:
The first input voltage detection module L1A is connected with a first phase of the input end of the three-phase power supply switch KM and is used for detecting an input voltage signal of the first phase;
The second input voltage detection module L2A is connected with a second phase of the input end of the three-phase power supply switch KM and is used for detecting an input voltage signal of the second phase;
The third input voltage detection module L3A is connected with a third phase of the input end of the three-phase power supply switch KM and is used for detecting an input voltage signal of the third phase;
The second processing module is used for determining the input end state of the three-phase power supply switch KM based on the input voltage signal of the first phase, the input voltage signal of the second phase and the input voltage signal of the third phase.
In the present application, the detection device further includes a first input voltage detection module L1A, a second input voltage detection module L2A, a third input voltage detection module L3A, and a second processing module, where the first input voltage detection module L1A is configured to detect an input voltage signal of a first phase, the second input voltage detection module L2A is configured to detect an input voltage signal of a second phase, the third input voltage detection module L3A is configured to detect an input voltage signal of a third phase, and the second processing module ultimately determines an input end state of the three-phase power supply switch KM based on the input voltage signal of the first phase, the input voltage signal of the second phase, and the input voltage signal of the third phase. The input end states comprise three-phase power, wherein the three-phase power does not exist, power supply faults or defects are equal, and reliable detection of the input end states of the three-phase power supply switch KM is achieved.
As a preferred embodiment, the first input voltage detection module L1A is a first input detection voltage detection relay, the second input voltage detection module L2A is a second input detection voltage detection relay, and the third input voltage detection module L3A is a third input detection voltage detection relay;
One end of a coil of the first input voltage detection relay is connected with a first phase of an input end of the three-phase power supply switch KM, and the other end of the coil is grounded; one end of a coil of the second input voltage detection relay is connected with a second phase of the input end of the three-phase power supply switch KM, and the other end of the coil is grounded; one end of a coil of the third input voltage detection relay is connected with a third phase of the input end of the three-phase power supply switch KM, and the other end of the coil is grounded.
Specifically, in the application, the first output voltage detection module L1B, the second input voltage detection module L2A and the third input voltage detection module L3A are all relays, when alternating current exists on a three-phase circuit at the input end of the three-phase power supply switch KM, the coil of the relay is electrified, the contact of the relay performs corresponding actions, when no alternating current exists on the three-phase circuit at the input end of the three-phase power supply switch KM, the coil of the relay is electrified, and the contact of the relay performs corresponding actions.
Therefore, whether the three-phase circuit at the input end of the three-phase power supply switch KM has alternating current or not can be reflected through the action of the contact of the relay, and reliable detection of whether the three-phase circuit at the input end of the three-phase power supply switch KM has alternating current or not is realized.
As a preferred embodiment, the second processing module includes a first input detection module and a second input detection module;
the direct current power supply DC positive end, the normally open contact of the first input voltage detection relay, the normally open contact of the second input voltage detection relay and the first end of the normally open contact of the third input voltage detection relay are sequentially connected in series;
The direct current power supply DC positive end, the normally closed contact of the first input voltage detection relay, the normally closed contact of the second input voltage detection relay and the first end of the normally closed contact of the third input voltage detection relay are sequentially connected in series;
The first input detection module is used for detecting a first input voltage between the second end of the normally open contact of the third input voltage detection relay and a grounding point;
the second input detection module is used for detecting a second input voltage between a second end of the normally-closed contact of the third input voltage detection relay and a grounding point so as to determine the input end state of the three-phase power supply switch KM based on the first input voltage and the second input voltage.
In the application, the first input voltage detection relay, the second input voltage detection relay and the third input voltage detection relay all comprise normally open contacts and normally closed contacts. Specifically, the normally open contact of the first input voltage detection relay, the normally open contact of the second input voltage detection relay and the normally open contact of the third input voltage detection relay are sequentially connected in series, and the normally closed contact of the first input voltage detection relay, the normally closed contact of the second input voltage detection relay and the normally closed contact of the third input voltage detection relay are sequentially connected in series.
The method comprises the steps that when a three-phase power supply, a first input voltage detection relay, a second input voltage detection relay and a third input voltage detection relay are normal and have no faults, if three-phase alternating current exists, normally open contacts of the first input voltage detection relay, the second input voltage detection relay and the third input voltage detection relay are closed, normally closed contacts are opened, at the moment, the first input voltage detected by a first input detection module is the direct current voltage of a direct current power supply DC, and the second input voltage detected by a second input detection module is 0V; if the three-phase alternating current does not exist, at the moment, the normally open contacts of the first input voltage detection relay, the second input voltage detection relay and the third input voltage detection relay are opened, the normally closed contacts are closed, the normally closed contacts of the control state relay RA are closed, at the moment, the first output voltage detected by the first input detection module is 0V, and the second output voltage detected by the second input detection module is the direct current voltage of the direct current power supply DC.
In practical application, if the situation that the first output voltage detected by the first input detection module and the second input voltage detected by the second input detection module are both direct-current voltages occurs, it is indicated that a relay fault, such as contact damage, may occur at this time. If the first input voltage detected by the first input detection module and the second input voltage detected by the second input detection module are both 0V, the situation that three-phase power failure, such as phase failure or relay failure, occurs at the moment is indicated.
In this way, the input state of the three-phase power supply switch KM can be reliably detected.
As a preferred embodiment, the second processing module further comprises a first input detection relay KA1 with forced guiding contacts and a second input detection relay KA2 with forced guiding contacts;
The first end of the coil of the first input detection relay KA1 is connected with the second end of the normally open contact of the third input voltage detection relay, and the second end is connected with a grounding point;
the first end of the coil of the second input detection relay KA2 is connected with the second end of the normally closed contact of the third input voltage detection relay, and the second end is connected with a grounding point;
the first end of the normally closed contact of the first input detection relay KA1 is connected with the DC positive end of the direct current power supply, and the second end of the normally closed contact of the second input detection relay KA2 is connected with the first end of the normally open contact;
the first end of the normally closed contact of the first input detection relay KA1 is connected with the DC positive end of the direct current power supply, and the second end of the normally closed contact of the second input detection relay KA2 is connected with the first end of the normally open contact;
The first input detection module is used for detecting a first input voltage between the second end of the normally open contact of the second input detection relay KA2 and a grounding point;
The second input detection module is used for detecting a second input voltage between a second end of the normally-closed contact of the second input detection relay KA2 and a grounding point so as to determine the input end state of the three-phase power supply switch KM based on the first input voltage and the second input voltage.
In order to further improve the safety and reliability of the detection of the power supply circuit, in the present application, the second processing module further includes a first input detection relay KA1 with a forced guiding contact and a second input detection relay KA2 with a forced guiding contact. The first input voltage detected by the first input detection module and the second input voltage detected by the second input detection module are as follows:
Table 2 input side logic table
| Sd_A | /Sd_A | Input side state |
| Low and low | Low and low | Failure of power supply or loss of phase or failure of relay |
| Low and low | High height | All three phases exist |
| High height | Low and low | Three phases are not present |
| High height | High height | Faults (short-circuit of joint or damage of contact, etc) |
It should be noted that, when the first input voltage detected by the first input detection module is a dc voltage, sd_a is high, and when the first input voltage detected by the first input detection module is 0V, sd_b is low; when the second input voltage detected by the second input detection module is a direct current voltage,/sd_a is high, and when the second input voltage detected by the second input detection module is 0V,/sd_a is low.
Therefore, the input end state of the three-phase power supply switch KM can be reliably detected in the mode, and in addition, the first input detection relay KA1 and the second input detection relay KA2 are provided with forced guide contacts, so that the safety is high.
The application also provides a power supply system of the three-phase motor, which comprises a three-phase power supply switch KM, and a detection device of the power supply circuit of the three-phase motor, wherein the input end of the three-phase power supply switch KM is connected with an alternating current power supply, and the output end of the three-phase power supply switch KM is connected with the three-phase motor.
For the description of the detection device for the power supply circuit of the three-phase motor in the power supply system provided by the application, reference is made to the embodiment of the device, and the description of the detection device is omitted herein.
It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides a detection device of power supply circuit of three-phase motor, its characterized in that is provided with the input and is connected with alternating current power supply on the power supply circuit, and the output is with the three-phase power supply switch that three-phase motor is connected, detection device includes:
The first output voltage detection module is connected with a first phase of the output end of the three-phase power supply switch and is used for detecting an output voltage signal of the first phase;
the second output voltage detection module is connected with a second phase of the output end of the three-phase power supply switch and is used for detecting an output voltage signal of the second phase;
the third output voltage detection module is connected with a third phase of the output end of the three-phase power supply switch and is used for detecting an output voltage signal of the third phase;
The switch control module is connected with the control end of the three-phase power supply switch and is used for outputting a control instruction to the three-phase power supply switch so as to control the three-phase power supply switch to be closed or opened;
The first processing module is used for determining the output end state of the three-phase power supply switch based on the control instruction, the output voltage signal of the first phase, the output voltage signal of the second phase and the output voltage signal of the third phase;
The first output voltage detection module is a first output voltage detection relay, the second output voltage detection module is a second output voltage detection relay, and the third output voltage detection module is a third output voltage detection relay;
One end of a coil of the first output voltage detection relay is connected with a first phase of an output end of the three-phase power supply switch, and the other end of the coil of the first output voltage detection relay is grounded; one end of a coil of the second output voltage detection relay is connected with a second phase of the output end of the three-phase power supply switch, and the other end of the coil of the second output voltage detection relay is grounded; one end of a coil of the third output voltage detection relay is connected with a third phase of the output end of the three-phase power supply switch, and the other end of the coil of the third output voltage detection relay is grounded;
the three-phase power supply switch is a three-phase power supply contactor, the input end of a normally open contact of the three-phase power supply contactor is connected with the alternating current power supply, and the output end of the normally open contact is connected with the three-phase motor;
the switch control module comprises a control switch, wherein the control switch is arranged on a power supply loop of a coil of the three-phase power supply contactor and is used for controlling power obtaining and losing of the coil of the three-phase power supply contactor through on-off of the control switch;
the switch control module further comprises a coil of a control state relay connected with the control switch, and the first processing module comprises a first output detection module and a second output detection module;
The direct-current power supply positive end, the normally open contact of the first output voltage detection relay, the normally open contact of the second output voltage detection relay and the first end of the normally open contact of the third output voltage detection relay are sequentially connected in series;
The direct-current power supply positive end, the normally-closed contact of the first output voltage detection relay, the normally-closed contact of the second output voltage detection relay and the first end of the normally-closed contact of the third output voltage detection relay are sequentially connected in series;
The first output detection module is used for detecting a first output voltage between the second end of the normally open contact of the third output voltage detection relay and a grounding point;
the second output detection module is used for detecting a second output voltage between a second end of the normally-closed contact of the control state relay and a grounding point so as to determine the state of the output end of the three-phase power supply switch based on the first output voltage and the second output voltage.
2. The apparatus for detecting a power supply circuit of a three-phase motor according to claim 1, wherein the first processing module further includes a first output detection relay with a forced guiding contact and a second output detection relay with a forced guiding contact;
A first end of a coil of the first output detection relay is connected with a second end of a normally open contact of the third output voltage detection relay, and the second end is connected with a grounding point;
The first end of the coil of the second output detection relay is connected with the second end of the normally closed contact of the control state relay, and the second end is connected with a grounding point;
The first end of the normally-closed contact of the first output detection relay is connected with the positive end of the direct-current power supply, and the second end of the normally-closed contact of the second output detection relay is connected with the first end of the normally-open contact of the second output detection relay;
the first end of the normally open contact of the first output detection relay is connected with the positive end of the direct current power supply, and the second end of the normally open contact of the first output detection relay is connected with the first end of the normally closed contact of the second output detection relay;
Correspondingly, the first output detection module is specifically configured to detect a first output voltage between a second end of a normally open contact of the second output detection relay and a ground point;
The second output detection module is used for detecting a second output voltage between a second end of a normally-closed contact of the second output detection relay and a grounding point so as to determine the output end state of the three-phase power supply switch based on the first output voltage and the second output voltage.
3. The detection device of a power supply circuit of a three-phase motor according to any one of claims 1 to 2, further comprising:
the first input voltage detection module is connected with a first phase of the input end of the three-phase power supply switch and is used for detecting an input voltage signal of the first phase;
the second input voltage detection module is connected with a second phase of the input end of the three-phase power supply switch and is used for detecting an input voltage signal of the second phase;
the third input voltage detection module is connected with a third phase of the input end of the three-phase power supply switch and is used for detecting an input voltage signal of the third phase;
and the second processing module is used for determining the input end state of the three-phase power supply switch based on the input voltage signal of the first phase, the input voltage signal of the second phase and the input voltage signal of the third phase.
4. A detecting device for a power supply circuit of a three-phase motor according to claim 3, wherein the first input voltage detecting module is a first input detecting voltage detecting relay, the second input voltage detecting module is a second input detecting voltage detecting relay, and the third input voltage detecting module is a third input detecting voltage detecting relay;
One end of a coil of the first input voltage detection relay is connected with a first phase of an input end of the three-phase power supply switch, and the other end of the coil of the first input voltage detection relay is grounded; one end of a coil of the second input voltage detection relay is connected with a second phase of the input end of the three-phase power supply switch, and the other end of the coil of the second input voltage detection relay is grounded; one end of a coil of the third input voltage detection relay is connected with a third phase of the input end of the three-phase power supply switch, and the other end of the coil of the third input voltage detection relay is grounded.
5. The detecting device for a power supply circuit of a three-phase motor according to claim 4, wherein the second processing module includes a first input detecting module and a second input detecting module;
The direct-current power supply positive end, the normally open contact of the first input voltage detection relay, the normally open contact of the second input voltage detection relay and the first end of the normally open contact of the third input voltage detection relay are sequentially connected in series;
The direct-current power supply positive end, the normally-closed contact of the first input voltage detection relay, the normally-closed contact of the second input voltage detection relay and the first end of the normally-closed contact of the third input voltage detection relay are sequentially connected in series;
The first input detection module is used for detecting a first input voltage between the second end of the normally open contact of the third input voltage detection relay and a grounding point;
The second input detection module is used for detecting a second input voltage between a second end of a normally-closed contact of the third input voltage detection relay and a grounding point so as to determine the input end state of the three-phase power supply switch based on the first input voltage and the second input voltage.
6. The apparatus for detecting a power supply circuit of a three-phase motor according to claim 5, wherein the second processing module further includes a first input detection relay with a forced guiding contact and a second input detection relay with a forced guiding contact;
A first end of a coil of the first input detection relay is connected with a second end of a normally open contact of the third input voltage detection relay, and the second end is connected with a grounding point;
the first end of the coil of the second input detection relay is connected with the second end of the normally-closed contact of the third input voltage detection relay, and the second end is connected with a grounding point;
The first end of the normally closed contact of the first input detection relay is connected with the positive end of the direct current power supply, and the second end of the normally closed contact of the first input detection relay is connected with the first end of the normally open contact of the second input detection relay;
The first end of the normally closed contact of the first input detection relay is connected with the positive end of the direct current power supply, and the second end of the normally closed contact of the first input detection relay is connected with the first end of the normally open contact of the second input detection relay;
The first input detection module is used for detecting a first input voltage between a second end of a normally open contact of the second input detection relay and a grounding point;
the second input detection module is used for detecting a second input voltage between a second end of a normally-closed contact of the second input detection relay and a grounding point so as to determine the input end state of the three-phase power supply switch based on the first input voltage and the second input voltage.
7. A power supply system for a three-phase motor, characterized by comprising a three-phase power supply switch with an input connected to an ac power supply and an output connected to the three-phase motor, and by further comprising a detection device for a power supply circuit of the three-phase motor as claimed in any one of claims 1 to 6.
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