CN213302350U - Metal zinc oxide arrester resistive current rapid measurement device - Google Patents
Metal zinc oxide arrester resistive current rapid measurement device Download PDFInfo
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- CN213302350U CN213302350U CN202022339816.0U CN202022339816U CN213302350U CN 213302350 U CN213302350 U CN 213302350U CN 202022339816 U CN202022339816 U CN 202022339816U CN 213302350 U CN213302350 U CN 213302350U
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Abstract
The application provides a device for quickly measuring the resistive current of a metal zinc oxide arrester, which comprises a sampling current sensor and a host, wherein the sampling current sensor comprises a first current sensor and a second current sensor; the first current sensor is arranged in a circuit of the lightning arrester to be detected and used for acquiring a leakage current signal of a grounding down lead of the lightning arrester to be detected and transmitting the leakage current signal to the host; the second current sensor is arranged in a circuit of the capacitive equipment connected with the lightning arrester to be tested on the same high-voltage bus, and is used for measuring a leakage current signal of the in-phase capacitive equipment ground down lead and transmitting the leakage current signal to the host; the host is connected with the first current sensor and the second current sensor and used for receiving leakage current signals transmitted by the first current sensor and the second current sensor and calculating and analyzing the leakage current signals to obtain the resistive current of the lightning arrester. The device that this application provided does not need complicated wiring, and is practical convenient.
Description
Technical Field
The application relates to the technical field of online monitoring of a metal zinc oxide arrester, in particular to a device for quickly measuring the resistive current of the metal zinc oxide arrester based on in-phase capacitive equipment leakage current and voltage inversion.
Background
At present, a metal zinc oxide arrester (MOA) has good nonlinear characteristics, can prevent various electric power equipment connected in parallel with the MOA from being influenced by abnormal high voltage, is widely applied to an electric power system, and is an indispensable ring for ensuring the safe and stable operation of the electric power system.
The MOA can have the phenomenon of valve plate aging or wetting in the long-term operation process, so that the protection capability of the MOA is reduced and even the MOA fails. At the initial stage of the insulation degradation of the valve block inside the lightning arrester, the resistive current under the operating voltage of the lightning arrester can be obviously increased, the capacitive current is not changed greatly, and the total current and the resistive current under the operating voltage are important parameters for judging the operating state of the lightning arrester.
The acquisition of system voltage (arrester voltage) is the basic requirement for accurately measuring the resistive current of the metal zinc oxide arrester. In the conventional art, the reference voltage measurement method includes a secondary voltage method, an induction plate method, and a compensation method. The measurement device adopting the induction plate method and the compensation method influences the precision of the resistive current of the lightning arrester due to inaccurate reference voltage; the measurement device for obtaining reference voltage from the secondary side of the voltage transformer has stable and credible test reference voltage and resistive current results, but because the secondary voltage of the voltage transformer needs to be obtained in live detection, the secondary side short circuit caused by misoperation can cause malfunction of a relay protection device, and the safety and stability of a power system are seriously influenced.
SUMMERY OF THE UTILITY MODEL
The application provides a device for quickly measuring resistive current of a metal zinc oxide arrester, which is used for quickly measuring the resistive current of the metal zinc oxide arrester in an inversion mode based on leakage current and voltage of in-phase capacitive equipment.
The technical scheme adopted by the application for solving the technical problems is as follows:
a device for quickly measuring the resistive current of a metal zinc oxide arrester comprises a sampling current sensor and a host;
the sampling current sensor comprises a first current sensor and a second current sensor;
the first current sensor is arranged in a circuit of the lightning arrester to be tested and used for acquiring a leakage current signal of a grounding down lead of the lightning arrester to be tested and transmitting the leakage current signal of the grounding down lead of the lightning arrester to be tested to the host;
the second current sensor is arranged in a circuit of the capacitive equipment connected with the lightning arrester to be tested on the same high-voltage bus, and is used for measuring a leakage current signal of the in-phase capacitive equipment ground down lead and transmitting the leakage current signal of the in-phase capacitive equipment ground down lead to the host;
the host is connected with the first current sensor and the second current sensor and used for receiving a leakage current signal of the to-be-detected lightning arrester ground down lead and a leakage current signal of the in-phase capacitive equipment ground down lead transmitted by the first current sensor and the second current sensor, and calculating and analyzing the leakage current signal of the to-be-detected lightning arrester ground down lead and the leakage current signal of the in-phase capacitive equipment ground down lead to obtain the resistive current of the lightning arrester.
Optionally, the host includes a signal receiving unit, a signal comparing unit, a resistive current solving unit, and a signal output unit, which are connected in sequence;
the signal receiving unit is used for synchronously receiving the leakage current signal of the lightning arrester grounding down lead to be tested and the leakage current signal of the in-phase capacitive equipment grounding down lead transmitted by the first current sensor and the second current sensor;
the signal comparison unit is used for comparing a time difference delta t between a leakage current signal of the grounding down conductor of the lightning arrester to be tested and a leakage current signal of the grounding down conductor of the in-phase capacitive equipment and converting the time difference delta t into a phase angle difference phi;
the resistive current solving unit is used for solving resistive current in leakage current flowing through the lightning arrester to be tested according to the phase angle difference phi and transmitting the solved resistive current result to the signal output unit;
the signal output unit is used for outputting the resistive current.
Optionally, the second current sensor is a passive zero-flux feedthrough transformer.
Optionally, the signal receiving unit includes a data signal conditioning circuit and an a/D synchronous converting circuit, and is configured to receive the leakage current signal of the lightning arrester ground down conductor to be tested and the leakage current signal of the in-phase capacitive device ground down conductor to be tested through differential amplification and filtering, and convert the leakage current signal of the lightning arrester ground down conductor to be tested and the leakage current signal of the in-phase capacitive device ground down conductor to be digital signals through the a/D synchronous converting circuit.
Optionally, the a/D synchronous conversion circuit is a high-speed a/D synchronous conversion circuit.
The technical scheme provided by the application comprises the following beneficial technical effects:
the application provides a device for quickly measuring the resistive current of a metal zinc oxide arrester, which comprises a sampling current sensor and a host, wherein the sampling current sensor comprises a first current sensor and a second current sensor; the first current sensor is arranged in a circuit of the lightning arrester to be detected and used for acquiring a leakage current signal of a grounding down lead of the lightning arrester to be detected and transmitting the leakage current signal of the grounding down lead of the lightning arrester to be detected to the host; the second current sensor is arranged in a circuit of the capacitive equipment connected with the lightning arrester to be tested on the same high-voltage bus, and is used for measuring a leakage current signal of the in-phase capacitive equipment ground down lead and transmitting the leakage current signal of the in-phase capacitive equipment ground down lead to the host; the host is connected with the first current sensor and the second current sensor and used for receiving the leakage current signal of the to-be-detected lightning arrester grounding down lead and the leakage current signal of the in-phase capacitive equipment grounding down lead transmitted by the first current sensor and the second current sensor, and calculating and analyzing the leakage current signal of the to-be-detected lightning arrester grounding down lead and the leakage current signal of the in-phase capacitive equipment grounding down lead to obtain the resistive current of the lightning arrester. The device that this application provided does not need complicated wiring, and can measure on the spot, and is practical convenient, can effectively compensate current measuring equipment's defect for metal zinc oxide arrester resistive current measures have accuracy and security concurrently, and the state aassessment to arrester in service has important meaning.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a device for rapidly measuring a resistive current of a zinc oxide arrester according to an embodiment of the present application.
Description of reference numerals:
the lightning protection device comprises a high-voltage bus 1, a lightning arrester to be tested 2, a lightning counter 3, a first current sensor 4, a capacitive device 5, a second current sensor 6, a host 7, a signal receiving unit 8, a signal comparing unit 9, a resistive current solving unit 10 and a signal output unit 11.
Detailed Description
In order to make the technical solutions in the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; it is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The lightning arrester reference voltage adopts a high-accuracy passive zero-flux straight-through transformer to acquire leakage current of capacitive equipment connected with the lightning arrester reference voltage on the same high-voltage bus, the leakage current is subjected to signal amplification and A/D conversion, then a Fourier decomposition and digital integration circuit is used for integrating the leakage current to obtain a reference signal, the reference signal is sent to a subsequent signal comparison module, and finally the reference signal is sent to an upper computer for waveform comparison and analysis, and the voltage and current signals are subjected to phase-shifting comparison to obtain the arrester resistive current.
Referring to fig. 1, fig. 1 is a diagram illustrating a device for rapidly measuring a resistive current of a zinc oxide arrester according to an embodiment of the present application, as shown in fig. 1, the device includes a sampling current sensor and a host 7;
the sampling current sensor comprises a first current sensor 4 and a second current sensor 6;
the first current sensor 4, i.e. CT1 in the figure, is installed in the circuit of the lightning arrester 2 to be tested and is used for acquiring the leakage current signal I of the grounding down conductor of the lightning arrester 2 to be testedXAnd the leakage current signal I of the grounding down lead of the lightning arrester to be testedXTo the host 7;
the second current sensor 6, shown as CT2, is installed in the circuit of the capacitive device 5 connected to the same high-voltage bus 1 as the lightning arrester 2 to be tested, and is used to measure the leakage current signal I of the grounded down conductor of the capacitive device 5 in phaseCAnd the leakage current signal I of the in-phase capacitance type equipment grounding down lead is connectedCTo the host 7;
the host 7 is connected with the first current sensor 4 and the second current sensor 6 and used for receiving a leakage current signal I of a grounding down lead of the lightning arrester 2 to be detected transmitted by the first current sensor 4 and the second current sensor 6XAnd leakage current signal I of in-phase capacitive device grounding down conductorCAnd the leakage current signal I of the grounding down lead of the lightning arrester to be testedXAnd leakage current signal I of in-phase capacitive device grounding down conductorCAnd calculating and analyzing to obtain the resistive current of the lightning arrester.
The device that this application provided does not need complicated wiring, and can measure on the spot, and is practical convenient, can effectively compensate current measuring equipment's defect for metal zinc oxide arrester resistive current measures have accuracy and security concurrently, and the state aassessment to arrester in service has important meaning.
As an embodiment, the host 7 includes a signal receiving unit 8, a signal comparing unit 9, a resistive current solving unit 10, and a signal output unit 11, which are connected in sequence;
the signal receiving unit 8 is configured to synchronously receive the leakage current signal I of the lightning arrester ground down lead to be tested transmitted by the first current sensor 4 and the second current sensor 6XAnd leakage current signal I of in-phase capacitive device grounding down conductorC；
The signal comparison unit 9 is used for comparing the leakage current signal I of the grounding down lead of the lightning arrester 2 to be testedXAnd leakage current signal I of in-phase capacitive device grounding down conductorCTime difference betweenΔ t and converting said time difference Δ t into a phase angle difference Φ, wherein the conversion may be calculated according to:
the resistive current solving unit 10 is configured to solve a resistive current in the leakage current flowing through the arrester according to the phase angle difference Φ, and transmit a result of the solved resistive current to the signal output unit 11, where the solving process may be completed by the following equation:
IR＝Ix×sinΦ；
the signal output unit 11 is configured to output the resistive current.
The signal receiving unit 8 comprises a data signal conditioning circuit and an A/D synchronous conversion circuit, and is used for receiving the leakage current signal I of the grounding down lead of the lightning arrester 2 to be detected through differential amplification and filteringXAnd leakage current signal I of in-phase capacitive device grounding down conductorCAnd the leakage current signal I of the grounding down lead of the lightning arrester to be testedXAnd leakage current signal I of in-phase capacitive device grounding down conductorCConverted into digital signals by an A/D synchronous conversion circuit.
The A/D synchronous conversion circuit is a high-speed A/D synchronous conversion circuit.
In one embodiment, the second current sensor 6 is a passive zero flux feedthrough transformer.
In summary, the device for rapidly measuring the resistive current of the metal zinc oxide arrester provided in the embodiment of the present application includes a sampling current sensor and a host 7, wherein the sampling current sensor includes a first current sensor 4 and a second current sensor 6; the first current sensor 4 is installed in a circuit of the lightning arrester 2 to be tested and used for acquiring a leakage current signal of a grounding down lead of the lightning arrester 2 to be tested and transmitting the leakage current signal of the grounding down lead of the lightning arrester 2 to be tested to the host 7; the second current sensor 6 is installed in a circuit of the capacitive equipment 5 connected with the lightning arrester 2 to be tested on the same high-voltage bus, and is used for measuring a leakage current signal of the in-phase capacitive equipment 5 grounded down lead and transmitting the leakage current signal of the in-phase capacitive equipment 5 grounded down lead to the host 7; the host 7 is connected with the first current sensor 4 and the second current sensor 6, and is configured to receive the leakage current signal of the ground down conductor of the lightning arrester 2 to be tested and the leakage current signal of the ground down conductor of the in-phase capacitive device 5 transmitted by the first current sensor 4 and the second current sensor 6, and perform calculation analysis on the leakage current signal of the ground down conductor of the lightning arrester 2 to be tested and the leakage current signal of the ground down conductor of the in-phase capacitive device 5, so as to obtain the resistive current of the lightning arrester. The device that this application provided does not need complicated wiring, and can measure on the spot, and is practical convenient, can effectively compensate current measuring equipment's defect for metal zinc oxide arrester resistive current measures have accuracy and security concurrently, and the state aassessment to arrester in service has important meaning.
It is noted that relational terms such as "first" and "second," and the like, may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice 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.
It will be understood that the present application is not limited to what has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (5)
1. A device for quickly measuring the resistive current of a metal zinc oxide arrester is characterized by comprising a sampling current sensor and a host;
the sampling current sensor comprises a first current sensor and a second current sensor;
the first current sensor is arranged in a circuit of the lightning arrester to be tested and used for acquiring a leakage current signal of a grounding down lead of the lightning arrester to be tested and transmitting the leakage current signal of the grounding down lead of the lightning arrester to be tested to the host;
the second current sensor is arranged in a circuit of the capacitive equipment connected with the lightning arrester to be tested on the same high-voltage bus, and is used for measuring a leakage current signal of the in-phase capacitive equipment ground down lead and transmitting the leakage current signal of the in-phase capacitive equipment ground down lead to the host;
the host is connected with the first current sensor and the second current sensor and used for receiving a leakage current signal of the to-be-detected lightning arrester ground down lead and a leakage current signal of the in-phase capacitive equipment ground down lead transmitted by the first current sensor and the second current sensor, and calculating and analyzing the leakage current signal of the to-be-detected lightning arrester ground down lead and the leakage current signal of the in-phase capacitive equipment ground down lead to obtain the resistive current of the lightning arrester.
2. The device for rapidly measuring the resistive current of the metal zinc oxide arrester according to claim 1, wherein the host comprises a signal receiving unit, a signal comparing unit, a resistive current solving unit and a signal output unit which are connected in sequence;
the signal receiving unit is used for synchronously receiving the leakage current signal of the lightning arrester grounding down lead to be tested and the leakage current signal of the in-phase capacitive equipment grounding down lead transmitted by the first current sensor and the second current sensor;
the signal comparison unit is used for comparing a time difference delta t between a leakage current signal of the grounding down conductor of the lightning arrester to be tested and a leakage current signal of the grounding down conductor of the in-phase capacitive equipment and converting the time difference delta t into a phase angle difference phi;
the resistive current solving unit is used for solving resistive current in leakage current flowing through the lightning arrester to be tested according to the phase angle difference phi and transmitting the solved resistive current result to the signal output unit;
the signal output unit is used for outputting the resistive current.
3. The device of claim 1, wherein the second current sensor is a passive zero flux feedthrough transformer.
4. The device of claim 2, wherein the signal receiving unit comprises a data signal conditioning circuit and an a/D synchronous conversion circuit, and is configured to differentially amplify and filter the received leakage current signal of the lightning arrester ground down conductor to be tested and the leakage current signal of the in-phase capacitive device ground down conductor, and convert the leakage current signal of the lightning arrester ground down conductor to be tested and the leakage current signal of the in-phase capacitive device ground down conductor into digital signals through the a/D synchronous conversion circuit.
5. The device of claim 4, wherein the A/D synchronous conversion circuit is a high-speed A/D synchronous conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022339816.0U CN213302350U (en) | 2020-10-20 | 2020-10-20 | Metal zinc oxide arrester resistive current rapid measurement device |
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|---|---|---|---|
| CN202022339816.0U CN213302350U (en) | 2020-10-20 | 2020-10-20 | Metal zinc oxide arrester resistive current rapid measurement device |
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| CN213302350U true CN213302350U (en) | 2021-05-28 |
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