CN211878078U - Impact grounding impedance tester - Google Patents
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- CN211878078U CN211878078U CN201921390844.6U CN201921390844U CN211878078U CN 211878078 U CN211878078 U CN 211878078U CN 201921390844 U CN201921390844 U CN 201921390844U CN 211878078 U CN211878078 U CN 211878078U
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Abstract
The utility model discloses an impulse grounding impedance tester, which is provided with a current output end used for being connected with a load connecting end of a grounding network, and a current detection end and a voltage detection end used for being connected with a signal output end of the grounding network; the impact grounding impedance tester comprises a current generator, a central controller, a voltage divider, a Rogowski coil and an acquisition card; the output end of the current generator is connected with the current output end, and the control end of the current generator is connected with the first control end of the central controller; the input end of the voltage divider is connected with the voltage detection end, and the output end of the voltage divider is connected with the first input end of the acquisition card; the input end of the Rogowski coil is connected with the current detection end, and the output end of the Rogowski coil is connected with the second input end of the acquisition card; the output end of the acquisition card is connected with the input end of the central controller, and the second control end of the central controller is connected with the control end of the acquisition card, so that an effective measuring tool is provided for measuring the impact grounding impedance, and the portable characteristic is realized.
Description
Technical Field
The utility model relates to a earthing device performance detects technical field, especially relates to an impact grounding impedance tester.
Background
In the measurement of impulse grounding resistance, because the distance between a grounding electrode and a current electrode is far (dozens of meters to hundreds of meters), the loop is long in connection, and the value of the impulse grounding resistance is generally from several ohms to hundreds of ohms, so that the inductance and the resistance in the whole loop are large, and the high voltage is needed for generating a lightning current waveform with a steep wave head and a large amplitude. However, the impulse current generator to generate such a lightning current waveform is huge both in volume and weight, and is not practical at all for field measurements. And no corresponding product exists in the market at present, so that a novel measuring instrument capable of directly measuring the impulse resistance is very necessary to be developed.
Disclosure of Invention
The embodiment of the utility model provides an impact grounding impedance tester provides effectual measuring tool for measuring impact grounding impedance, has portable's characteristics.
In order to achieve the above object, an embodiment of the present invention provides an impulse grounding impedance tester, which has a current output terminal for connecting with a load connection terminal of a grounding grid, and a current detection terminal and a voltage detection terminal for connecting with a signal output terminal of the grounding grid;
the impact grounding impedance tester comprises a current generator, a central controller, a voltage divider, a Rogowski coil and a collection card; the output end of the current generator is connected with the current output end, and the control end of the current generator is connected with the first control end of the central controller; the input end of the voltage divider is connected with the voltage detection end, and the output end of the voltage divider is connected with the first input end of the acquisition card; the input end of the Rogowski coil is connected with the current detection end, and the output end of the Rogowski coil is connected with the second input end of the acquisition card; the output end of the acquisition card is connected with the input end of the central controller, and the second control end of the central controller is connected with the control end of the acquisition card.
As an improvement of the above scheme, the current generator has a first signal control terminal, a second signal control terminal and a third signal control terminal for connecting with the control terminal of the current generator, and a first current output terminal, a second current output terminal, a current signal output terminal, a voltage signal output terminal and a measurement output terminal for connecting with the output terminal of the current generator;
the current generator comprises a switching power supply chip, a first relay, a second relay, a third relay, a first diode, a second diode, a third diode, a capacitor, a wave modulation inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;
a fourth contact of the first relay is connected with the first signal control end and the negative electrode of the first diode, a second contact of the first relay is connected with the voltage output end of the switching power supply chip, the first contact of the first relay is connected with the first end of the capacitor, the first end of the seventh resistor and the second contact of the second relay, and the third contact of the first relay and the positive electrode of the first diode are grounded;
a fourth contact of the second relay is connected with the second signal control end and the cathode of the second diode, a first contact is connected with a first end of the third resistor and a first end of the wave modulating inductor, and a third contact and the anode of the second diode are grounded;
a fourth contact of the third relay is connected with the third signal control end and the cathode of the third diode, a first contact is connected with the second end of the seventh resistor, and the second contact, the third contact and the anode of the third diode are grounded;
the second end of the wave modulating inductor is connected with the first end of the first resistor;
the current signal output end is respectively connected with a second end of the capacitor, a second end of the third resistor, a second end of the fourth resistor and a first end of the sixth resistor;
the first current output end is connected with the second end of the first resistor and the first end of the fourth resistor; the measurement output end is connected with the first end of the second resistor; the second current output end is connected with a second end of the sixth resistor and a second end of the fifth resistor; a second end of the sixth resistor and a second end of the fifth resistor are grounded;
the voltage signal output end is respectively connected with the second end of the second resistor and the first end of the fifth resistor.
As an improvement of the above scheme, the central controller comprises a current generator control module, a data processing module and an acquisition card control module;
the output end of the current generator control module is connected with the first control end of the central controller;
the output end of the acquisition card control module is connected with the second control end of the central controller;
and the input end of the data processing module is connected with the input end of the central controller.
As an improvement of the above scheme, the impulse grounding impedance tester further comprises a system power supply;
the output end of the system power supply is respectively connected with the current generator, the central controller, the voltage divider and the power supply end of the acquisition card.
As an improvement of the above scheme, a voltage input terminal of the switching power supply chip is connected with a power supply terminal of the current generator.
As an improvement of the scheme, the switching power supply chip is a DC-DC-DWP 602.
As an improvement of the scheme, the acquisition card is a parallel high-speed data acquisition card for the acquisition cards of the medicines of the diseases of the patients.
Compared with the prior art, the utility model discloses an impact grounding impedance tester, through the impact grounding impedance tester have be used for with the load connection end connection of ground net current output end and be used for with the signal output part of ground net current detection end and the voltage detection end of connection; the impact grounding impedance tester comprises a current generator, a central controller, a voltage divider, a Rogowski coil and a collection card; the output end of the current generator is connected with the current output end, and the control end of the current generator is connected with the first control end of the central controller; the input end of the voltage divider is connected with the voltage detection end, and the output end of the voltage divider is connected with the first input end of the acquisition card; the input end of the Rogowski coil is connected with the current detection end, and the output end of the Rogowski coil is connected with the second input end of the acquisition card; the output end of the acquisition card is connected with the input end of the central controller, and the second control end of the central controller is connected with the control end of the acquisition card. Structure more than adopting, set for current generator's charge time and the range of collection card through central controller, and then through inserting current generator, inject the impact current signal that current generator generated into the grounding body of ground net, and then utilize the voltage divider to measure the voltage condition of grounding body, and utilize the current condition of rogowski coil measurement grounding body, and then adopt the collection card to gather and measure voltage current signal and transmit it to central controller, make this central controller can obtain impact ground resistance according to received voltage current signal, thereby realize that current generator produces the lightning current waveform that is used for impacting ground resistance measurement, provide effectual measuring tool for measuring impact ground resistance, and the device has portable's characteristics, can satisfy field measurement's demand.
Drawings
Fig. 1 is a schematic structural diagram of an impulse grounding impedance tester according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a current generator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, which is a schematic structural diagram of an impulse grounding impedance tester 1 in an embodiment of the present invention, the impulse grounding impedance tester 1 has a current output terminal for connecting with a load connection terminal of a grounding grid 2, and a current detection terminal and a voltage detection terminal for connecting with a signal output terminal of the grounding grid 2;
the impulse grounding impedance tester 1 comprises a current generator 11, a central controller 12, a voltage divider 13, a Rogowski coil 14 and an acquisition card 15; the output end of the current generator 11 is connected with the current output end, and the control end of the current generator 11 is connected with the first control end of the central controller 12; the input end of the voltage divider 13 is connected with the voltage detection end, and the output end of the voltage divider 13 is connected with the first input end of the acquisition card 15; the input end of the rogowski coil 14 is connected with the current detection end, and the output end of the rogowski coil 14 is connected with the second input end of the acquisition card 15; the output end of the acquisition card 15 is connected with the input end of the central controller 12, and the second control end of the central controller 12 is connected with the control end of the acquisition card 15.
The current generator 11 may be a device or a circuit chip having an impulse current waveform that generates a lightning current waveform close to a standard one. In this embodiment, the central controller 12 obtains the charging amplitude and the charging time of the current generator 11 according to the charging voltage set by the user, so as to control the current generator 11 to charge. The acquisition card 15 may be a device and a chip with data acquisition function, and is used for acquiring the voltage and current signals sent by the voltage divider 13 and the rogowski coil 14 and transmitting the signals to the central controller 12. Preferably, the acquisition card 15 is a m SB2800 parallel high-speed data acquisition card. In this embodiment, the acquisition card 15 sets the range of the acquisition card 15 through the central controller 12, preferably, the range of the μm SB2800 parallel high speed data acquisition card is ± 100mV, ± 200mV, ± 500mV, ± 1.0V, ± 2.0V, ± 5.0V, ± 10.0V. The voltage divider 13 may be a device having a function of measuring a high voltage for measuring a voltage of a ground body in the ground net 2. The rogowski coil 14 may be a device having a function of measuring current for measuring the current of the earth in the earth grid 2.
Referring to fig. 1, in an alternative embodiment, the central controller 12 includes a current generator control module 121, a data processing module 123 and an acquisition card control module 122;
the output end of the current generator control module 121 is connected to the first control end of the central controller 12;
the output end of the acquisition card control module 122 is connected with the second control end of the central controller 12;
the input end of the data processing module 123 is connected with the input end of the central controller 12.
In order to realize the functions of the central controller 12, such as controlling the current generator 11 and the acquisition card 15, and storing and processing data, the central controller 12 of this embodiment includes a current generator control module 121, a data processing module 123, and an acquisition card control module 122. The current generator control module 121 may be a device or a chip having functions of generating a charging amplitude and a charging time. In this embodiment, the current generator control module 121 generates the charging amplitude and the charging time of the current generator 11 according to the charging voltage set by the user, so as to control the current generator 11. The acquisition card control module 122 may be a device or chip having functions of controlling the range of the acquisition card 15, etc. In this embodiment, the acquisition card control module 122 sets the range of the acquisition card 15 according to the current generator parameters such as the charging voltage, the charging amplitude, and the like, so that the measured voltage and current values do not exceed the range of the range. The data processing module 123 may be a device and a chip having functions of data acquisition, storage, processing, and the like. In this embodiment, the data processing module 123 reads and stores the measured voltage and current signals sent by the acquisition card 15, and further obtains the response voltage under the impulse current by convolution, thereby obtaining the impulse grounding impedance.
For a linear time-invariant system, the ratio of the response image function R(s) to the excitation image function E(s) in the zero state is defined as the system function (also called network function), i.e. the ratio
When the excitation image function E(s) and the response image function R(s) are taken from the same port of the system, the system function has input impedance meaning, i.e.
For a linear time-invariant system, the system function is unique and does not change with the change of the excitation signal characteristic. If the system function is used as the input impedance, the following formula (3) holds:
wherein, I1(s) and I2(s) are respectively system-excited Laplace transformation, U1(s) and U2(s) for the response under the corresponding stimulus, the result is obtained by working up equation (3):
U2(s)I1(s)＝U1(s)I2(s) (4)
and (4) performing inverse Laplace transform on two sides of the formula (4) simultaneously to obtain a time domain convolution equation. By definition of convolution, the convolution of a continuous time domain can be discretized when the sampling time interval is sufficiently small. Discretizing the above formula yields the following form:
wherein, T is the sampling time interval, the above formula (5) is arranged, and T is set as the time unit, the convolution formula of the discrete time domain is obtained:
u2(n)*i1(n)＝u1(n)*i2(n) (6)
when n is 0, it can be obtained from formula (6):
when n is 1, it can be obtained from formula (6):
wherein i1(n)，u1(n) and i2(n) are sample value sequences in the time domain, and u can be obtained by combining the formula (7) and the formula (8)2(n)And (4) sequencing.
In this embodiment, the data processing module 123 is configured to pass the collected impulse current i with a relatively slow wave head1(n) and its response voltage u1(n) obtaining a standard lightning current i with a steep wave head through convolution transformation2(n) response voltage u of the earth network2(n) and thereby u2Maximum value of (n) and i2The maximum value ratio of (n) is the impulse grounding resistance Rch. In particular, the current generator 11 is used to generate an impact incidence current i1(t)，i1(t) flowing through the earth to generate a response voltage u1(t), further to i1(t) and u1(t) sampling to obtain a sampling value sequence i1(nT) and u1(nT) stored in the dual port RAM, and i2(t) the value of the sampling sequence is pre-calculated i2(nT) and stored in the program memory area, thereby obtaining a sequence u from the formula (7) and the formula (8)2(nT) and obtaining a ballistic grounding resistance Rch。
Referring to fig. 2, in an alternative embodiment, the current generator 11 has a first signal control terminal V11, a second signal control terminal V12 and a third signal control terminal V13 for connecting with the control terminal of the current generator 11, and a first current output terminal VOUT +, a second current output terminal VOUT-, a current signal output terminal V31, a voltage signal output terminal V21 and a measurement output terminal VHOUT + connected with the output terminal of the current generator 11;
the current generator 11 comprises a switching power supply chip U1, a first relay K1, a second relay K2, a third relay K3, a first diode D1, a second diode D2, a third diode D3, a capacitor C, a wave-modulating inductor L, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7;
a fourth contact of the first relay K1 is connected with the first signal control end V11 and the negative electrode of the first diode D1, a second contact is connected with the voltage output end of the switching power supply chip U1, the first contact is connected with the first end of the capacitor C, the first end of the seventh resistor R7 and the second contact of the second relay K2, and the third contact and the positive electrode of the first diode D1 are grounded;
a fourth contact of the second relay K2 is connected to the second signal control terminal V12 and the negative electrode of the second diode D2, a first contact is connected to the first end of the third resistor R3 and the first end of the wave-modulating inductor L, and a third contact and the positive electrode of the second diode D2 are grounded;
a fourth contact of the third relay K3 is connected to the third signal control terminal V13 and the cathode of the third diode D3, a first contact is connected to the second terminal of the seventh resistor R7, and the second contact, the third contact and the anode of the third diode D3 are grounded;
the second end of the wave modulating inductor L is connected with the first end of the first resistor R1;
the current signal output terminal V31 is respectively connected with the second terminal of the capacitor C, the second terminal of the third resistor R3, the second terminal of the fourth resistor R4 and the first terminal of the sixth resistor R6;
the first current output terminal VOUT + is connected with the second end of the first resistor R1 and the first end of the fourth resistor R4; the measurement output end VHOUT + is connected with a first end of a second resistor R2; the second current output terminal VOUT-is connected with a second terminal of the sixth resistor R6 and a second terminal of the fifth resistor R5; a second end of the sixth resistor R6 and a second end of the fifth resistor R5 are grounded;
the voltage signal output terminal V21 is respectively connected to the second terminal of the second resistor R2 and the first terminal of the fifth resistor R5.
In this embodiment, the current generator 11 boosts the lower dc voltage to a higher dc voltage through the switching power supply chip U1, and then charges the capacitor C, so as to discharge in a very short time, thereby forming an instantaneous large current. The switching power supply chip U1 is used to raise the dc voltage provided by the system power supply to a high voltage. Preferably, the switching power supply chip U1 is a DC-DC-DWP 602. Illustratively, the first pin of the switching power supply chip U1 is a voltage input terminal V4, the sixth pin is a voltage output terminal for boosting the dc voltage provided by the system power supply to 1000V to charge the capacitor C, the second pin, the third pin and the seventh pin are grounded, the fourth pin is a voltage regulating terminal, and the fifth pin is a reference voltage input terminal. The capacitor C is a high voltage capacitor and is used for charging the current generator 11, and the first end of the capacitor C is a positive end and the second end is a negative end. And the wave modulation inductor L is used for adjusting the waveform characteristics to generate a double-exponential wave. The first signal control terminal V11, the second signal control terminal V12, and the third signal control terminal V13 are respectively used for controlling the first relay K1, the second relay K2, and the third relay K3. The first relay K1, the second relay K2 and the third relay K3 are single-pole single-throw relays. First relay K1 realizes the charging to condenser C, treats that condenser C charges and accomplishes the back, realizes discharging through second relay K2, and then forms step pulse through wave modulation inductance L, first resistance R1, third resistance R3 and fourth resistance R4 to the realization is to the impulse current output of measurement object, and the grounding body of ground net 2 connects between first current output end VOUT + and second current output end VOUT-promptly. Further, the sixth resistor R6 may be a small non-inductive resistor, which extracts the current signal flowing through the tested object, and outputs the current signal through the current signal output terminal V31, and converts the current signal into a voltage signal. Further, the second resistor R2 and the fifth resistor R5 in this embodiment form a voltage divider to extract a voltage signal of the object to be tested and output the voltage signal through the voltage signal output terminal V21, and the voltage signal output terminal V21 may connect the voltage signal to an instrument for displaying the voltage signal, or may transmit the voltage signal to a voltage secondary processing element. By adopting the structure, the current generator 11 can realize that the amplitude of the incident impact current reaches tens of amperes so as to meet the signal-to-noise ratio required during measurement. Secondly, a lightning current waveform with steep wave head and large amplitude is formed by adjusting the capacitor C and the wave adjusting inductor L, the time ratio of the wave head to the wave tail is 5s/20s, then the amplitude of the impact current is adjustable to save the electric energy of the battery and ensure the measurement precision, and then the charging loop and the discharging loop can be respectively controlled to be switched on and switched off.
In an alternative embodiment, the impulse grounding impedance tester 1 further comprises a system power supply;
the output end of the system power supply is respectively connected with the power ends of the current generator 11, the central controller 12, the voltage divider 13 and the acquisition card 15.
Preferably, the voltage input terminal V4 of the switching power supply chip U1 is connected to the power supply terminal of the current generator 11.
It should be noted that the impulse grounding impedance tester 1 is a portable measuring device, and a self-contained power supply is necessary in field operation, and the power supply voltage is required to be relatively stable and reliable, and preferably 8-section number 2 1.5V nickel-hydrogen batteries can be adopted, and the output voltage and the capacity are 12V/3500 mAh.
The utility model provides a pair of impact grounding impedance tester has following beneficial effect: the impulse grounding impedance tester is provided with a current output end connected with a load connecting end of a grounding grid, a current detection end and a voltage detection end which are connected with a signal output end of the grounding grid; the impact grounding impedance tester comprises a current generator, a central controller, a voltage divider, a Rogowski coil and a collection card; the output end of the current generator is connected with the current output end, and the control end of the current generator is connected with the first control end of the central controller; the input end of the voltage divider is connected with the voltage detection end, and the output end of the voltage divider is connected with the first input end of the acquisition card; the input end of the Rogowski coil is connected with the current detection end, and the output end of the Rogowski coil is connected with the second input end of the acquisition card; the output end of the acquisition card is connected with the input end of the central controller, and the second control end of the central controller is connected with the control end of the acquisition card. Structure more than adopting, set for current generator's charge time and the range of collection card through central controller, and then through inserting current generator, inject the impact current signal that current generator generated into the grounding body of ground net, and then utilize the voltage divider to measure the voltage condition of grounding body, and utilize the current condition of rogowski coil measurement grounding body, and then adopt the collection card to gather and measure voltage current signal and transmit it to central controller, make this central controller can obtain impact ground resistance according to received voltage current signal, thereby realize that current generator produces the lightning current waveform that is used for impacting ground resistance measurement, provide effectual measuring tool for measuring impact ground resistance, and the device has portable's characteristics, can satisfy field measurement's demand.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (7)
1. The impulse grounding impedance tester is characterized by comprising a current output end connected with a load connecting end of a grounding network, a current detection end and a voltage detection end, wherein the current detection end and the voltage detection end are connected with a signal output end of the grounding network;
the impact grounding impedance tester comprises a current generator, a central controller, a voltage divider, a Rogowski coil and a collection card; the output end of the current generator is connected with the current output end, and the control end of the current generator is connected with the first control end of the central controller; the input end of the voltage divider is connected with the voltage detection end, and the output end of the voltage divider is connected with the first input end of the acquisition card; the input end of the Rogowski coil is connected with the current detection end, and the output end of the Rogowski coil is connected with the second input end of the acquisition card; the output end of the acquisition card is connected with the input end of the central controller, and the second control end of the central controller is connected with the control end of the acquisition card.
2. The impulse grounding impedance tester of claim 1, wherein said current generator has a first signal control terminal, a second signal control terminal and a third signal control terminal for connection to a control terminal of said current generator, and a first current output terminal, a second current output terminal, a current signal output terminal, a voltage signal output terminal and a measurement output terminal connected to an output terminal of said current generator;
the current generator comprises a switching power supply chip, a first relay, a second relay, a third relay, a first diode, a second diode, a third diode, a capacitor, a wave modulation inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;
a fourth contact of the first relay is connected with the first signal control end and the negative electrode of the first diode, a second contact of the first relay is connected with the voltage output end of the switching power supply chip, the first contact of the first relay is connected with the first end of the capacitor, the first end of the seventh resistor and the second contact of the second relay, and the third contact of the first relay and the positive electrode of the first diode are grounded;
a fourth contact of the second relay is connected with the second signal control end and the cathode of the second diode, a first contact is connected with a first end of the third resistor and a first end of the wave modulating inductor, and a third contact and the anode of the second diode are grounded;
a fourth contact of the third relay is connected with the third signal control end and the cathode of the third diode, a first contact is connected with the second end of the seventh resistor, and the second contact, the third contact and the anode of the third diode are grounded;
the second end of the wave modulating inductor is connected with the first end of the first resistor;
the current signal output end is respectively connected with a second end of the capacitor, a second end of the third resistor, a second end of the fourth resistor and a first end of the sixth resistor;
the first current output end is connected with the second end of the first resistor and the first end of the fourth resistor; the measurement output end is connected with the first end of the second resistor; the second current output end is connected with a second end of the sixth resistor and a second end of the fifth resistor; a second end of the sixth resistor and a second end of the fifth resistor are grounded;
the voltage signal output end is respectively connected with the second end of the second resistor and the first end of the fifth resistor.
3. The impulse grounding impedance tester of claim 1, wherein said central controller comprises a current generator control module, a data processing module and an acquisition card control module;
the output end of the current generator control module is connected with the first control end of the central controller;
the output end of the acquisition card control module is connected with the second control end of the central controller;
and the input end of the data processing module is connected with the input end of the central controller.
4. The apparatus of claim 2, wherein the apparatus further comprises a system power supply;
the output end of the system power supply is respectively connected with the current generator, the central controller, the voltage divider and the power supply end of the acquisition card.
5. The apparatus according to claim 4, wherein the voltage input terminal of the switching power supply chip is connected to the power supply terminal of the current generator.
6. The impulse grounding impedance tester of claim 2, wherein the switching power supply chip is a DC-DWP 602.
7. The impulse grounding impedance tester as claimed in claim 1, wherein the acquisition card is a m SB2800 parallel high speed data acquisition card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921390844.6U CN211878078U (en) | 2019-08-23 | 2019-08-23 | Impact grounding impedance tester |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921390844.6U CN211878078U (en) | 2019-08-23 | 2019-08-23 | Impact grounding impedance tester |
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| CN201921390844.6U Expired - Fee Related CN211878078U (en) | 2019-08-23 | 2019-08-23 | Impact grounding impedance tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608031A (en) * | 2021-08-04 | 2021-11-05 | 北京英瑞来科技有限公司 | Method and device for monitoring impulse impedance of transformer substation lightning arrester |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608031A (en) * | 2021-08-04 | 2021-11-05 | 北京英瑞来科技有限公司 | Method and device for monitoring impulse impedance of transformer substation lightning arrester |
| CN113608031B (en) * | 2021-08-04 | 2024-02-02 | 北京英瑞来科技有限公司 | Impact impedance monitoring method and device for substation lightning arrester |
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