CN111521903B - SPD resistive current online intelligent monitoring device and monitoring method - Google Patents
SPD resistive current online intelligent monitoring device and monitoring method Download PDFInfo
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- 238000004364 calculation method Methods 0.000 claims abstract description 19
- 238000007670 refining Methods 0.000 claims description 35
- 230000005389 magnetism Effects 0.000 claims description 32
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
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Abstract
The invention discloses an SPD resistive current online intelligent monitoring device and a monitoring method, wherein the monitoring device comprises a micro-current mutual inductance transmitter, a voltage transmitter, a resistive current calculation module, an MCU processor and a fidelity circuit, wherein the micro-current mutual inductance transmitter and the voltage transmitter are respectively used for collecting current and voltage signals flowing through each phase module of the SPD, and the resistive current calculation module is used for calculating the current and voltage signals to obtain a resistive current value and then transmitting the resistive current value to the MCU processor; and the MCU processor analyzes and processes the resistive current value and controls the fidelity circuit to perform precision fidelity on the micro-current mutual inductance transmitter. The invention can ensure the accuracy of SPD degradation monitoring by the fidelity of the precision of the micro-current mutual inductance transmitter.
Description
Technical Field
The invention relates to the field of monitoring of SPD resistive current, in particular to an SPD resistive current online intelligent monitoring device and a monitoring method.
Background
With the use of a large number of low-voltage line lightning protection devices in the industries of building electricity, railway, highway, telecommunication, electric power, petrochemical industry and the like, the lightning protection device (SPD) mainly adopts a zinc oxide varistor (MOV) element, and a large amount of experience shows that the initial resistive current of the varistor when leaving a factory has a close relationship with the service life characteristic and the safety of the varistor. The resistance current can reflect the deterioration degree of the SPD, the varistor can be heated when the resistance current is too large, the varistor can be lowered in voltage and further raised in the resistance current when the resistance current is heated, and finally the varistor can be ignited and burnt due to overhigh temperature in such a circulating way, so that great potential safety hazards are caused. Therefore, accidents caused by deterioration and failure of the SPD are increasing, most of the accidents are caused by the resistive current of the SPD, and the main accidents include failure accidents of lightning protection after failure, fire accidents caused by high temperature due to overlarge resistive current of the SPD.
At present, the leakage current detection of the SPD module mainly adopts a method of regularly off-line detection by adopting a handheld special SPD leakage current tester. According to the characteristics of large quantity of SPDs, point position dispersion and the like of the existing detection method, the consumption of manpower and material resources is large. In addition, the aging of the SPD module is accelerated along with the thermal breakdown of lightning impulse or module leakage current, and the aging is random in time, so that the deterioration progress of the SPD cannot be tracked anytime and anywhere.
The invention patent with application number 201410507470.7 discloses an SPD online intelligent monitoring device and an SPD online intelligent monitoring system, which monitor the deterioration of the SPD by monitoring voltage signals and current signals of each phase of the SPD, wherein the current signals are the total current of a piezoresistor, the total current comprises a resistive current and a capacitive current, the capacitive current is the inherent characteristic of the piezoresistor, occupies the vast majority of the total current, and has no influence on the service life and accidents of the piezoresistor. And the capacitive current generates larger distortion along with the increase of the harmonic wave of the power grid, so that the substantive problem of the piezoresistor cannot be explained. In addition, because the current sensor adopts a current mutual inductance principle device, the coil iron core generates residual magnetism in the iron core after a large current (such as lightning current) passes through the coil iron core, so that the specific difference and the angular difference of the transformer are increased, the accuracy is lost, and the deterioration condition of the SPD cannot be accurately obtained.
In summary, there is an urgent need for an SPD resistive current online intelligent monitoring device and a corresponding monitoring method for improving accuracy of monitoring deterioration condition of SPD
Disclosure of Invention
In order to solve the technical problems, the invention discloses an SPD resistive current online intelligent monitoring device, which has the following specific technical scheme:
a SPD resistive current online intelligent monitoring device comprises a micro-current mutual inductance transmitter, a voltage transmitter, a resistive current calculation module, an MCU processor and a fidelity circuit, wherein the micro-current mutual inductance transmitter and the voltage transmitter are respectively used for collecting current and voltage signals flowing through each phase module of the SPD, and the resistive current calculation module is used for calculating the current and voltage signals to obtain a resistive current value and then transmitting the resistive current value to the MCU processor; and the MCU processor analyzes and processes the resistive current value and controls the fidelity circuit to perform precision fidelity on the micro-current mutual inductance transmitter.
Furthermore, the resistive current calculation module comprises a filtering and amplifying circuit, a phase angle operation module and a resistive current calculation module, wherein the phase angle operation module is used for acquiring a voltage signal of the voltage transducer, acquiring a current signal of the micro-current mutual inductance transducer through the filtering and amplifying circuit, and calculating a phase angle of the current signal and the voltage signal; and the resistive current calculation module calculates the resistive current of each phase module of the SPD according to the phase angle.
Furthermore, the fidelity circuit comprises a magnetism refining circuit and a calibration circuit which are connected with a power supply, the magnetism refining circuit is connected with two ends of a coil of the micro-current mutual inductance transmitter, and the calibration circuit penetrates through the coil of the micro-current mutual inductance transmitter; and a first switch and a second switch which are connected with a time controller are respectively arranged on the input lines of the magnetic refining circuit and the calibration circuit, and the time controller is connected with the MCU controller.
Furthermore, the input circuit of the magnetic circuit and the input circuit of the calibration circuit are respectively provided with a magnetic circuit resistance and a calibration resistance.
And furthermore, the lightning stroke counting device also comprises an action counting module for counting lightning strokes, one end of the action counting module is connected with the resistive current calculating module, the other end of the action counting module is connected with the MCU processor, and when the resistive current is larger than 1mA, the action counting module counts the lightning strokes.
Further, the MCU processor is in communication connection with an upper monitoring data server, and transmits data for analyzing and processing the resistive current value to the upper monitoring data server.
In addition, the invention also discloses a monitoring method of the resistive current of the SPD, which specifically comprises the following steps:
firstly, performing initial precision fidelity on a micro-current mutual inductance transmitter before initial monitoring;
collecting current and voltage signals flowing through each phase module of the SPD through a micro-current mutual inductance transmitter and a voltage transmitter;
thirdly, filtering and amplifying the current signals acquired in the second step, and calculating the phase angle of the voltage signals and the phase angle of the current signals according to the voltage signals and the filtered and amplified current signals;
step four, calculating to obtain resistive current according to the filtered and amplified current signal and the phase angle in the step three;
and fifthly, judging whether the resistive current is larger than 1mA, counting by the action counting module when the resistive current is larger than 1mA, and performing process precision fidelity on the micro-current mutual inductance transmitter through a fidelity circuit.
Further, the initial accuracy fidelity process of the first step includes:
a. electrifying the SPD resistive current online intelligent monitoring device to work until components in a circuit board of the SPD resistive current online intelligent monitoring device reach a normal and stable working state; such as the state of stable charging of the capacitive device and stable temperature drift of the resistive device;
b. the MCU processor is used for controlling the first switch to be closed and the second switch to be opened, the magnetism refining circuit is used for refining magnetism for the reverse current of the micro-current mutual inductance transmitter coil, and the magnetism refining time is 1-2 minutes;
c. after the magnetic field is changed, the MCU processor controls the first switch to be switched off and the second switch to be switched on, the calibration circuit gives the calibration current of the micro-current mutual inductance transmitter to carry out acquisition, measurement and calibration, the acquisition, measurement and calibration time is 1 minute, and the second switch is switched off after the acquisition, measurement and calibration are finished. The factory can collect and calibrate the SPD before leaving the factory, but the installation site does not know what factory the SPD is, and when the characteristics are different, the SPD is calibrated on site, so that the monitoring universality of the product is improved.
Further, the process accuracy fidelity process in the fifth step includes: the MCU processor controls the first switch to be closed and the second switch to be opened, and the magnetism refining circuit refines magnetism to the reverse current of the micro-current mutual inductance transmitter coil.
Further, the time length of magnetic refining in the process accuracy fidelity is equal to the time length of magnetic refining in the initial accuracy fidelity. The length of the magnetism refining time in the fidelity process fidelity and the initial precision fidelity is the same, so that the coil of the micro-current mutual inductance transmitter after the process precision fidelity is the same as the magnetism remaining after the initial precision fidelity, the distortion of the micro-current mutual inductance transmitter is avoided, and the precision of the micro-current mutual inductance transmitter is further improved.
Has the advantages that: 1. according to the invention, the current and voltage signals are monitored by the micro-current mutual inductance transmitter, the current and voltage signals are collected by the voltage transmitter, then the phase angle is calculated by the current and voltage signals, and the resistive current is obtained by the phase angle, so that the deterioration degree of the SPD can be accurately monitored.
2. According to the invention, the fidelity of the process precision of the coil of the micro-current mutual inductance transmitter is carried out through the fidelity circuit, so that the micro-current mutual inductance transmitter can be restored to the magnetic conduction parameter before delivery even being influenced by lightning stroke, the acquisition precision of a current signal is improved, and the accuracy of monitoring the deterioration of the SPD is further ensured.
3. Before the micro-current mutual inductance transmitter is used, the invention adopts the fidelity circuit to carry out magnetism refining and calibration on the micro-current mutual inductance transmitter, so that the magnetic conduction parameters of the micro-current mutual inductance transmitter are solidified, thereby ensuring the measurement precision of the micro-current mutual inductance transmitter.
4. According to the invention, the MCU processor receives the signal of the resistive current of the piezoresistor in the SPD and transmits the signal to the upper monitoring data server, so that the module with deteriorated failure can be alarmed in time, a user is prompted to replace the corresponding lightning protection module in time, and the lightning protection failure and secondary disasters are avoided.
Drawings
FIG. 1 is a schematic view of a monitoring device according to the present invention;
FIG. 2 is a schematic diagram of a fidelity circuit of the present invention;
FIG. 3 is a schematic diagram of a calibration circuit passing through a micro-current transformer coil.
Reference numerals: 1-a voltage transmitter; 2-micro-current mutual inductance transmitter; 3-a filtering and amplifying circuit; 4-phase angle operation module; 5-resistive current calculation module; 6-a fidelity circuit; 7-MCU processor; 8-an action counting module; 9-a communication interface module; 10-a network communication interface; 11-485 communication interface; 12-a magnetic refining circuit; 13-a calibration circuit; 14-a power supply loop; 15-a first switch; 16-smelting magneto resistance; 17-a second switch; 18-calibrating the resistance; 19-time controller.
Detailed Description
In order to make the objects, principles and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments of lightning intrusion probability. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses an SPD resistive current online intelligent monitoring device which comprises a micro-current mutual inductance transmitter, a voltage transmitter, a resistive current calculation module, an MCU (microprogrammed control unit) processor and a fidelity circuit, wherein the micro-current mutual inductance transmitter and the voltage transmitter are respectively used for collecting current and voltage signals flowing through each phase module of the SPD, and the resistive current calculation module is used for calculating the current and voltage signals to obtain a resistive current value and then transmitting the resistive current value to the MCU processor; and the MCU processor analyzes and processes the resistive current value and controls the fidelity circuit to perform precision fidelity on the micro-current mutual inductance transmitter.
The micro-current mutual inductance transmitter acquires the total current flowing through the SPD, namely the leakage current comprises the resistive current and the capacitive current, so that the resistive current flowing through the SPD needs to be acquired through the resistive current calculation module, and the total current is acquired through the micro-current mutual inductance transmitter, so that the magnetic residue is generated in the coil iron core after the large current passes through the coil iron core, the specific difference and the angular difference of the transformer are increased, the accuracy is lost, and the micro-current mutual inductance transmitter is distorted when being struck by lightning and cannot accurately acquire the deterioration condition of the SPD. According to the invention, the precision fidelity is carried out on the micro-current mutual inductance transmitter through the fidelity circuit, so that the working accuracy of the micro-current mutual inductance transmitter is ensured, and the deterioration condition of the SPD is accurately obtained.
Specifically, in order to monitor the change of resistive current, resistive current calculation module includes filtering and amplifier circuit, phase angle operation module, resistive current calculation module, phase angle operation module is used for gathering voltage transmitter's voltage signal, and the current signal of the mutual inductance transmitter of little current through filtering and amplifier circuit collection, and calculates the phase angle of current signal and voltage signal, phase angle operation module carries with the IC chip that specific model is ATT7022, and voltage signal and current signal are gathered to phase angle operation moduleAnd after the phase angle is signed, obtaining a specific value of a phase angle α through the operation of an IC chip, calculating the resistive current of each phase module of the SPD by the resistive current calculating module according to the phase angle, and calculating the resistive current by the resistive current calculating module through a built-in algorithm, wherein the specific calculation formula is IRI × cos α wherein IRAnd the resistive current I is a current signal after passing through the filtering and amplifying circuit.
Under a normal working state, the resistive current obtained by the resistive current calculating module is far less than 1mA, when the module is impacted by lightning current, the SPD module instantly becomes a low resistance state according to the voltage value V1mA characteristic of the piezoresistor of the SPD, and the resistive current obtained by the resistive current calculating module is far more than 1 mA. The invention determines whether to carry out precision fidelity by judging whether the resistive current is greater than 1mA, namely when the resistive current value received by the MCU processor exceeds 1mA, the MCU processor controls the fidelity circuit to carry out magnetism refining on a reverse current for the coil of the micro-current mutual inductance transmitter. The coil magnetic core of the micro-current mutual inductance transmitter is restored to the magnetic refining characteristic when leaving the factory, and the original detection precision when leaving the factory is kept.
The reason why the magnetism needs to be reduced in the present invention is: when current passes through a conductive material (namely the micro-current mutual inductance transmitter coil), hysteresis can be generated in the magnetic conductive material under the action of an alternating magnetic field and an alternating electric field, so that the change of the ferromagnetic magnetic flux density B value lags behind the change of the magnetic field strength H value, and thus, a larger error exists in the measurement precision, and therefore, when the SPD is struck by lightning, the monitoring result of the micro-current mutual inductance transmitter is possibly distorted, and a fidelity circuit is required to conduct magnetic refining fidelity on the coil of the micro-current mutual inductance transmitter.
Specifically, the fidelity circuit comprises a magnetism refining circuit and a calibration circuit, wherein the magnetism refining circuit is connected with a power supply, the magnetism refining circuit is connected with two ends of a coil of the micro-current mutual inductance transmitter, and the calibration circuit penetrates through the coil of the micro-current mutual inductance transmitter; the input circuit of the magnetic circuit and the input circuit of the calibration circuit are respectively provided with a first switch and a second switch which are connected with a time controller, the time controller is connected with an MCU (microprogrammed control unit), and the input circuit of the magnetic circuit and the input circuit of the calibration circuit are respectively provided with a magnetic circuit resistor and a calibration resistor.
When the coil of the micro-current mutual inductance transmitter needs to be magnetized, the MCU processor controls the first switch to be closed and the second switch to be opened, the magnetizing circuit, the micro-current transmitter and the power supply circuit form a complete loop, 500mA reverse current is applied to the coil of the micro-current mutual inductance transmitter to be magnetized, after the work of the magnetizing circuit is completed, the first switch is controlled to be opened and the second switch is controlled to be closed, the current in the circuit is collected, measured and calibrated through 0.5mA, and the current collection precision is ensured by solidifying and conducting magnetic parameters when the micro-current transmitter leaves a factory through the process.
Furthermore, in order to count the lightning stroke, the monitoring device further comprises an action counting module for counting the lightning stroke, one end of the action counting module is connected with the resistive current calculating module, the other end of the action counting module is connected with the MCU processor, and when the resistive current is larger than 1mA, the action counting module counts the lightning stroke.
Furthermore, the MCU processor is connected with an upper monitoring data server through a communication interface module, and transmits data for analyzing and processing the resistive current value to the upper monitoring data server, wherein the communication interface module comprises a network communication interface and a 485 communication interface. Data for analyzing and processing the resistive current value are transmitted to an upper monitoring data server through the MCU processor, a module with deteriorated failure can be timely alarmed, a user is prompted to timely replace a corresponding lightning protection module, and the generation of lightning protection failure and secondary disasters is avoided.
In addition, the invention also discloses a monitoring method of the SPD resistive current, which specifically comprises the following steps:
firstly, performing initial precision fidelity on a micro-current mutual inductance transmitter before initial monitoring;
collecting current and voltage signals flowing through each phase module of the SPD through a micro-current mutual inductance transmitter and a voltage transmitter;
thirdly, filtering and amplifying the current signals acquired in the second step, and calculating the phase angle of the voltage signals and the phase angle of the current signals according to the voltage signals and the filtered and amplified current signals;
step four, calculating to obtain resistive current according to the filtered and amplified current signal and the phase angle in the step three;
and fifthly, judging whether the resistive current is larger than 1mA, counting by the action counting module when the resistive current is larger than 1mA, and performing process precision fidelity on the micro-current mutual inductance transmitter through a fidelity circuit.
The calculation formula of the resistive current in the fourth step is IRI × cos α wherein IRResistive current, I is the full current amplified in step two, and α is the phase angle;
the measurement precision of the micro-current mutual inductance transmitter cannot be guaranteed because the hysteresis parameter of the micro-current mutual inductance transmitter when the micro-current mutual inductance transmitter leaves a factory cannot be determined, and in order to improve the measurement precision, primary precision fidelity is carried out on all the micro-current transmitters before leaving the factory.
Specifically, the initial fidelity of precision process includes:
a. electrifying the SPD resistive current online intelligent monitoring device for more than 5 minutes to ensure that components in a circuit board of the SPD resistive current online intelligent monitoring device reach a normal and stable working state;
b. the MCU processor is used for controlling the first switch to be closed and the second switch to be opened, the magnetism refining circuit is used for refining magnetism for the reverse current of the micro-current mutual inductance transmitter coil, and the magnetism refining time is 1-2 minutes;
c. after the magnetic field is changed, the MCU processor controls the first switch to be switched off and the second switch to be switched on, the calibration circuit gives the calibration current of the micro-current mutual inductance transmitter to carry out acquisition, measurement and calibration, the acquisition, measurement and calibration time is 1 minute, and the second switch is switched off after the acquisition, measurement and calibration are finished.
In order to ensure the accuracy of the micro-current mutual inductance transmitter in the monitoring process, when the monitored resistive current is larger than 1mA, the MCU processor controls the fidelity circuit to perform process precision fidelity on the micro-current mutual inductance transmitter, and because the resistive current of the SPD is far smaller than 1mA under the normal working condition, when the resistive current is larger than 1mA, lightning stroke usually occurs.
Specifically, the process fidelity includes: the MCU processor controls the first switch to be switched on and the second switch to be switched off, and the magnetism refining circuit refines magnetism for the reverse current of the coil of the micro-current mutual inductance transmitter, so that the coil magnetic core of the micro-current mutual inductance transmitter is restored to the magnetism refining characteristic when the micro-current mutual inductance transmitter leaves a factory, and the original detection precision when the micro-current mutual inductance transmitter leaves the factory is maintained. And when the process precision is ensured to be true, the magnetism refining time length in the process precision is equal to the magnetism refining time length in the initial precision fidelity.
In the present invention, in the process of determining whether the resistive current is greater than 1mA to determine whether the lightning is struck, 1mA is only a reference value for distinguishing whether the lightning is struck, and may also be set to other current values capable of distinguishing whether the lightning is struck, which are described above only as preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The SPD resistive current online intelligent monitoring device is characterized by comprising a micro-current mutual inductance transmitter, a voltage transmitter, a resistive current calculation module, an MCU (microprogrammed control unit) processor and a fidelity circuit, wherein the micro-current mutual inductance transmitter and the voltage transmitter are respectively used for collecting current and voltage signals flowing through each phase module of the SPD; the MCU processor analyzes and processes the resistive current value and controls a fidelity circuit to perform precision fidelity on the micro-current mutual inductance transmitter;
the fidelity circuit comprises a magnetism refining circuit and a calibration circuit which are connected with a power supply, the magnetism refining circuit is connected with two ends of a coil of the micro-current mutual inductance transmitter, and the calibration circuit penetrates through the coil of the micro-current mutual inductance transmitter; a first switch and a second switch which are connected with a time controller are respectively arranged on input lines of the magnetic refining circuit and the calibration circuit, and the time controller is connected with an MCU controller; and the magnetism refining circuit is used for refining magnetism for the reverse current of the micro-current mutual inductance transmitter coil.
2. The SPD resistive current online intelligent monitoring device of claim 1, characterized in that: the resistive current calculation module comprises a filtering and amplifying circuit, a phase angle operation module and a resistive current calculation module, wherein the phase angle operation module is used for acquiring a voltage signal of a voltage transmitter, acquiring a current signal of the micro-current mutual inductance transmitter through the filtering and amplifying circuit and calculating a phase angle of the current signal and the voltage signal; and the resistive current calculation module calculates the resistive current of each phase module of the SPD according to the phase angle.
3. The SPD resistive current on-line intelligent monitoring device according to claim 1, characterized in that the input lines of the magneto-resistive circuit and the calibration circuit are respectively provided with a magneto-resistive resistor and a calibration resistor.
4. The SPD resistive current online intelligent monitoring device according to claim 1 or 2, characterized in that: the lightning stroke counting device is characterized by further comprising an action counting module for counting lightning strokes, one end of the action counting module is connected with the resistive current calculating module, the other end of the action counting module is connected with the MCU processor, and when the resistive current is larger than 1mA, the action counting module counts the lightning strokes.
5. The SPD resistive current online intelligent monitoring device according to claim 1 or 2, wherein the MCU processor is in communication connection with an upper monitoring data server, and transmits data for analyzing and processing the resistive current value to the upper monitoring data server.
6. A monitoring method of SPD resistive current is characterized by comprising the following steps:
firstly, performing initial precision fidelity on a micro-current mutual inductance transmitter before initial monitoring;
collecting current and voltage signals flowing through each phase module of the SPD through a micro-current mutual inductance transmitter and a voltage transmitter;
thirdly, filtering and amplifying the current signals acquired in the second step, and calculating the phase angle of the voltage signals and the phase angle of the current signals according to the voltage signals and the filtered and amplified current signals;
step four, calculating to obtain resistive current according to the filtered and amplified current signal and the phase angle in the step three;
judging whether the resistive current is larger than 1mA, counting by the action counting module when the resistive current is larger than 1mA, and performing process precision fidelity on the micro-current mutual inductance transmitter through a fidelity circuit;
the initial accuracy fidelity process of the first step comprises the following steps:
a. electrifying the SPD resistive current online intelligent monitoring device to work until components in a circuit board of the SPD resistive current online intelligent monitoring device reach a normal and stable working state;
b. the MCU processor controls the first switch to be closed and the second switch to be opened, and the magnetism refining circuit refines magnetism to the reverse current of the micro-current mutual inductance transmitter coil;
c. after the magnetic refining is finished, the MCU processor controls the first switch to be switched off and the second switch to be switched on, and the calibration circuit gives the calibration current of the micro-current mutual inductance transmitter for collection, measurement and calibration.
7. The SPD resistive current monitoring method of claim 6, characterized in that: the process precision fidelity process in the fifth step comprises the following steps: the MCU processor controls the first switch to be closed and the second switch to be opened, and the magnetism refining circuit refines magnetism to the reverse current of the micro-current mutual inductance transmitter coil.
8. The method of monitoring SPD resistive current according to claim 7, characterized by: the length of the magnetic refining time in the process accuracy fidelity is equal to the length of the magnetic refining time in the initial accuracy fidelity.
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| CN114188918A (en) * | 2021-12-07 | 2022-03-15 | 长沙润迅通信设备有限公司 | SPD degradation intelligent monitoring protection device and method |
| CN114545125A (en) * | 2022-02-25 | 2022-05-27 | 揭阳空港经济区弘新电子有限公司 | Piezoresistor testing device |
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