CN114966218A - Grounding resistance detection device and method for transformer substation grounding grid - Google Patents
Grounding resistance detection device and method for transformer substation grounding grid Download PDFInfo
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- CN114966218A CN114966218A CN202210169270.XA CN202210169270A CN114966218A CN 114966218 A CN114966218 A CN 114966218A CN 202210169270 A CN202210169270 A CN 202210169270A CN 114966218 A CN114966218 A CN 114966218A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention relates to a grounding resistance detection device and method of a transformer substation grounding grid, comprising a detection power supply, a grounding end and a detection end; the detection power supply is sequentially connected with a first capacitor and a second capacitor through a first step-up transformer, the second capacitor is respectively connected with a spherical gap switch and a first current-limiting resistor, the spherical gap switch is connected with a grounding end, and the first current-limiting resistor is connected with a detection end; the second capacitor, the first current-limiting resistor and the grounding grid to be tested form a capacitor discharge loop; the grounding resistance R of the grounding grid is Uc/Ic-R1, Uc and Ic are the discharge voltage and discharge current of the second capacitor, respectively, and R1 is the resistance of the first current limiting resistor. The first boosting transformer and the second capacitor form a high-voltage and high-current discharging mode to test the grounding resistance of the grounding grid, the working state of the transformer substation is met when the transformer substation is struck by lightning or has high-voltage grounding fault, the measurement is more reasonable, and meanwhile, the high-voltage and high-current discharging mode is not easily interfered by the magnetic field of electrical equipment in the transformer substation.
Description
Technical Field
The invention relates to the technical field of grounding detection, in particular to a grounding resistance detection device and method for a transformer substation grounding grid.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The transformer substation grounding grid is used for meeting the requirements of operating equipment, safety and grounding protection, and can rapidly guide fault short-circuit current or lightning current into the ground for releasing. The grounding grid is usually made of galvanized steel materials, is buried underground at the initial stage of transformer substation construction, is corroded by soil for a long time, and gradually reduces the material thinning or breaking along with the operation of the transformer substation, so that the grounding resistance is increased, the capability of guiding short-circuit current or lightning current to be led into the ground is reduced, and the personal safety and the equipment safety are threatened.
When a transformer substation is struck by lightning or has a high-voltage grounding fault, the transformer substation can directly enter a grounding grid in a high-voltage and high-current mode, the traditional resistance-to-ground test is realized through low voltage (220V) and small current (about 10A), the difference between the traditional resistance-to-ground test and the actual working state of the grounding grid is large, meanwhile, various types of electrical equipment in the transformer substation have complex electromagnetic interference, and the measurement result of the grounding resistance can be interfered to cause errors.
Disclosure of Invention
In order to solve at least one technical problem in the background technology, the invention provides a grounding resistance detection device and a grounding resistance detection method for a transformer substation grounding grid.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a grounding resistance detection device of a transformer substation grounding grid, which comprises a detection power supply, a grounding end and a detection end, wherein the detection power supply is connected with the grounding end;
the detection power supply is sequentially connected with a first capacitor and a second capacitor through a first step-up transformer, the second capacitor is respectively connected with a spherical gap switch and a first current-limiting resistor, the spherical gap switch is connected with a grounding end, and the first current-limiting resistor is connected with a detection end; the second capacitor, the first current-limiting resistor and the grounding grid to be tested form a capacitor discharge loop; the grounding resistance R of the grounding grid is Uc/Ic-R1, Uc and Ic are the discharge voltage and discharge current of the second capacitor, respectively, and R1 is the resistance of the first current limiting resistor.
The grounding end is a grounding nail driven into the ground, and the detection end is a position of a grounding grid to be tested.
A second current-limiting resistor is connected between the first boosting transformer and the first capacitor, the first capacitor is connected with the second capacitor through a second rectifying module and a third current-limiting resistor which are sequentially arranged, a first rectifying module is connected on a circuit between the first capacitor and the second rectifying module, and the first rectifying module is connected with the detection power supply.
The spherical gap switch comprises an upper hemisphere and a lower hemisphere which are arranged in parallel and have a gap, the upper hemisphere is connected with the second capacitor, and the lower hemisphere is connected with the grounding end; the middle part of the lower hemisphere is provided with a hole, the needle electrode is connected in the hole through an insulating layer, and the needle electrode is positioned in the center of the hole.
The ball gap switch is a discharge trigger switch of a capacitance discharge loop, and the discharge is realized by generating a trigger signal through a signal generating circuit.
The signal generating circuit comprises a phase inverter, an input port of the phase inverter is connected with the direct-current power supply sequentially through a fifth resistor and a fourth resistor, the phase inverter is connected with the fourth resistor sequentially through a third capacitor and a switch, and the phase inverter is further connected with the direct-current power supply through a diode.
The output port of the inverter is connected with the gate G of the IGBT, when the trigger signal is output, the collector C and the emitter E of the IGB T are conducted, and a circuit between the fourth rectifying module and the fourth capacitor is connected with the detection power supply through the conducted IGBT.
The detection power supply is connected with a fourth capacitor through a second step-up transformer, a sixth current-limiting resistor and a fourth rectifying module in sequence, and the fourth capacitor is connected with the lower hemisphere of the spherical gap switch through a seventh resistor.
The second aspect of the present invention provides a working method for the above device to realize the detection of the ground resistance of the ground grid, comprising the following steps:
when the voltage of the first boosting transformer reaches a positive half cycle, the first capacitor is charged, and when the voltage of the first boosting transformer reaches a negative half cycle, the first capacitor and the first boosting transformer charge the second capacitor simultaneously;
after the second capacitor is charged, and the ball gap switch is triggered and conducted, the second capacitor, the first current limiting resistor and the grounding grid to be tested form a conducted capacitor discharging loop, and the second capacitor discharges the capacitor discharging loop;
and acquiring the discharge voltage Uc and the discharge current Ic of the second capacitor, wherein the grounding resistance R of the grounding grid is Uc/Ic-R1, and R1 is the resistance value of the first current-limiting resistor R1.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
the first step-up transformer and the second capacitor form a high-voltage and high-current discharging mode to test the grounding resistance of the grounding grid, the working state of the transformer substation when the transformer substation is struck by lightning or has high-voltage grounding faults is met, the measurement is more reasonable, and meanwhile, the high-voltage and high-current discharging mode is not easily interfered by the magnetic field of electrical equipment in the transformer substation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a charging and discharging circuit of a second capacitor C2 of a detection apparatus according to one or more embodiments of the present invention;
FIG. 2 is a circuit diagram of an initial trigger signal generation circuit of a detection apparatus according to one or more embodiments of the present invention;
fig. 3 is a schematic structural diagram of a ball gap switch of a detection device according to one or more embodiments of the present invention;
FIG. 4 is a schematic diagram of a ball gap switch triggering circuit of a detection apparatus according to one or more embodiments of the present invention;
in the figure: 1. a needle electrode; 2. an insulating layer.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, when a substation is struck by lightning or has a high-voltage ground fault, the substation directly enters a ground grid in a high-voltage and high-current manner, while a traditional resistance-to-ground test is realized through low voltage (220V) and low current (about 10A), various types of electrical equipment in the substation have complex electromagnetic interference, and the measurement result of the ground resistance can be interfered, so that an error exists.
Therefore, the following embodiments provide a device and a method for detecting a ground resistance of a transformer substation grounding grid, so as to achieve the purpose of directly testing the ground resistance by using high voltage and large current.
At present, the operating voltage of primary equipment of a transformer substation is generally 10kV, 35kV, 110kV, 220kV and above, and the lightning voltage can reach thousands of kilovolts above. When high-voltage equipment of a transformer substation is grounded or is struck by lightning, the grounding grid is responsible for leading grounding current or lightning current into the ground, and the damage to people or equipment is prevented. The method for testing the resistance of the grounding grid by adopting the high-voltage and high-current high-voltage capacitor discharging method is closer to the actual working state, and the measurement is more reasonable.
The first embodiment is as follows:
as shown in fig. 1 to 4, the object of the present embodiment is to provide a ground resistance detection device for a substation grounding grid, which includes a detection power supply, a grounding terminal G1 and a detection terminal G2;
the detection power supply is sequentially connected with a first capacitor C1 and a second capacitor C2 through a first step-up transformer T1, the second capacitor C2 is respectively connected with a spherical gap switch Q and a first current-limiting resistor R1, the spherical gap switch Q is connected with a grounding terminal G1, and the first current-limiting resistor R1 is connected with a detection terminal G2; the second capacitor C2, the first current-limiting resistor R1 and the grounding grid to be tested form a capacitor discharge loop; the grounding resistance R of the grounding grid is Uc/Ic-R1, and Uc and Ic are the discharge voltage and discharge current of the second capacitor C2, respectively.
Ground terminal G1 should be a ground nail driven into the ground, and test terminal G2 is the location where the ground net is to be tested.
A second current-limiting resistor R2 is connected between the first boosting transformer T1 and the first capacitor C1, the first capacitor C1 is connected with a second capacitor C2 through a second rectifying module D2 and a third current-limiting resistor R3 which are sequentially arranged, a first rectifying module D1 is connected on a line between the first capacitor C1 and the second rectifying module D2, and the first rectifying module D1 is connected with a detection power supply.
The ball gap switch Q comprises two metal hemispheres (an upper hemisphere B1 and a lower hemisphere B2) which are arranged in parallel and have a gap, the upper hemisphere B1 is connected with a second capacitor C2, the lower hemisphere is connected with a grounding terminal G1, a hole is formed in the middle of the lower hemisphere B1, a needle electrode 1 is connected in the hole through an insulating layer 2, and the needle electrode 1 is located in the center of the hole.
The ball gap switch Q is a discharge trigger switch of a capacitor discharge loop, and the discharge is realized by generating a trigger signal through a signal generating circuit.
The signal generating circuit comprises an inverter, an input port of the inverter is connected with a direct current power supply +5V through a fifth resistor R5 and a fourth resistor R4 in sequence, the inverter is connected with a fourth resistor R4 through a third capacitor C3 and a switch in sequence, and the inverter is further connected with the direct current power supply +5V through a diode D3.
The output port of the inverter is connected with the gate G of the IGBT, when the trigger signal is output, the collector C and the emitter E of the IGBT are conducted, and the circuit between the fourth rectifying module D4 and the fourth capacitor C4 is connected with the detection power supply through the conducted IGBT
The detection power supply is connected with a fourth capacitor C4 through a second step-up transformer T2, a sixth current-limiting resistor R6 and a fourth rectifying module D4 in sequence, and the fourth capacitor C4 is connected with a lower hemisphere B2 of the ball gap switch Q through a seventh resistor R7.
The output port of the inverter triggers a signal, the fourth capacitor C4 discharges, the gap between the pin electrode and the lower hemisphere B2 breaks down, plasma is generated to distort the electric field between the upper hemisphere and the lower hemisphere of the spherical gap switch Q, so that the two hemispheric break-down spherical gap switch Q triggers, the second capacitor C2 is communicated with the grounding terminal G1 at the moment, and the second capacitor C2 discharges.
Specifically, the method comprises the following steps:
the step-up transformer is charged for the high-voltage capacitor through the charging circuit after getting electricity from the transformer substation maintenance power box, and after the capacitor is fully charged and the design circuit controls the capacitor to discharge, the instantaneous voltage and current of the capacitor discharge are recorded, namely the ground resistance can be calculated.
The main wiring diagram is as shown in fig. 1, the 220V voltage of the inspection power box is connected to a step-up transformer T1, when the voltage of a transformer T1 reaches the positive half cycle, a capacitor C1 is charged through a current-limiting resistor R2, and when the voltage reaches the negative half cycle, the capacitor C1 and the transformer T1 simultaneously charge a capacitor C2 through a current-limiting resistor R3, so that the charging time is shortened. After the voltage of the capacitor C2 is increased to a sufficiently high voltage (such as 30kV), the ball gap switch Q is triggered, after the ball gap switch Q is conducted, the left end of the capacitor C2 is equivalent to be directly connected with G1, the potential is changed into the ground, and then the right end of the capacitor C2 is at a negative high potential, so that the capacitor C2, the current-limiting resistor R1 and the grounding grid R form a capacitor discharge loop.
The grounding terminal G1 is a grounding nail driven into the ground to a proper depth, G2 is used for connecting the grounding terminal to be tested, and R is a grounding resistor. And recording the discharge voltage Uc and the discharge current Ic of the capacitor C2 by using an oscilloscope or a data acquisition card, and measuring the resistance R according to the values of the discharge voltage Uc and the discharge current Ic at the same moment. The grounding resistance R is Uc/Ic-R1, wherein Uc/Ic can be averaged by multiple measurements to reduce error.
The types and parameters of the devices are selected according to the actual situation on site, for example, the transformation ratio of the transformer T1 is 220:21000, the capacity is 1kVA, the type 2CL130/0.5 is selected for the rectifier silicon stack D1 (the first rectifier module D1), namely the maximum reverse withstand voltage value of 130kV, the maximum current is 0.5A, the type 2CL70/0.1 is selected for the rectifier silicon stack D2 (the second rectifier module D2), namely the maximum reverse withstand voltage value of 70kV, the maximum current is 0.1A, and the current limiting resistors R2 and R3 are both 2M omega, so that the charging current is limited, the power of a charging loop is not too high, the transformer with lower capacity can be selected to reduce the cost of the device, and the charging time is prolonged. The capacitor C1 is an electrolytic capacitor with rated voltage of 30kV and capacity of 0.1 uF. The C2 is preferably selected to be a capacitor (high-voltage capacitor) with larger capacity, the larger the capacity is, the longer the discharge time of the C2 is, the more convenient the measurement is to be carried out on the voltage and the current at the moment of discharge, the more accurate the calculation result is, and the pulse capacitor with the model of HZ MJ50kv-2uF can be selected through calculation.
The generation of the initial trigger signal uses a signal generation circuit whose main chip is an inverter 74LS 14. As shown in fig. 2, when the manual switch is open, the input port 1 of the inverter 74LS14 is connected to the +5V dc power supply through the resistors R4 and R5 to be at high level, and when the switch is closed, the input port 1 of the inverter is grounded through the small resistor R5 to be at low level. When the switch is closed once manually, a step signal is generated at input port 1 of inverter 74LS 14. After the phase inversion of the inverter, an initial trigger signal is generated and output by the output end 2 port. In fig. 2, a diode D3 and a capacitor C3 play roles of protection and voltage stabilization, the model of D3 can be selected to be IS1500, C3 IS only required to be 0.1uF common capacitor, and current-limiting resistors R4 and R5 play roles of current-limiting protection, and the resistance values are 7.4k Ω and 100 Ω respectively.
The main discharge circuit adopts a ball gap switch Q as a discharge trigger switch. As shown in fig. 3, the ball gap switch Q is composed of two metal hemispheres (an upper hemisphere B1 and a lower hemisphere B2) with a certain distance, the upper hemisphere B1 is connected to the left end of a capacitor C2, when the capacitor C2 is charged, the upper hemisphere B1 is at a high voltage potential, and the lower hemisphere is grounded G1. The lower hemisphere B1 has a hole with a diameter of about 1mm in the middle, and the insulating layer 2 (e.g., Teflon) fixes the needle electrode 1 (e.g., tungsten needle) in the hole, and the needle electrode 1 is located in the middle of the hole.
As shown in fig. 4, the 220kV power supply is boosted by the voltage regulator T2, and then passes through the current limiting resistor R6 and the rectifying silicon stack D4 to charge the capacitor C4. The voltage regulator T2 can select a transformation ratio of 220:3000 and a capacity of 0.5kVA, the resistance value of the current limiting resistor R6 is1 Komega, the model of the rectifier silicon stack D4 is 2CL10/0.1, and the model of the capacitor C4 is 0.1 uF. The input end 2 port of the inverter 74LS14 is connected with the gate G of the IGBT, after the switch is manually opened and closed, namely the input end 2 port of the inverter 74LS14 outputs a trigger signal, the collector C and the emitter E of the IGBT are conducted, the upper end of the charged capacitor C4 is grounded, the lower end of the charged capacitor C4 forms negative high voltage, the lower end of the capacitor C4 is connected with the metal needle electrode of the lower hemisphere of the ball gap switch after passing through R7, thus the negative high voltage is also formed on the metal needle electrode, the gap between the metal needle electrode and the lower hemisphere B2 (grounded) is broken down, plasma is generated to distort the electric field between the upper hemisphere and the lower hemisphere of the ball gap switch Q, so that the two hemispheres are broken down, the left end of the capacitor C2 is grounded, and further the main circuit in the figure 1 is discharged.
It should be noted that the breakdown voltage of the ball gap is dependent on the distance, and the appropriate ball gap distance should be selected according to the voltage level of the capacitor discharge. According to the reference, the electric field strength E of air breakdown is generally considered to be 30 kv/cm.
The device adopts a high-voltage and high-current discharging mode to test the resistance of the grounding grid, is closer to the actual working state of the grounding grid, is more reasonable in measurement, and meanwhile, is less prone to interference generated by the magnetic field of the electrical equipment in the transformer substation.
C2 among the above-mentioned device is high-voltage capacitor, and high-voltage capacitor charges the back through the long time, stores the electric energy, and although the electric energy of storage is less, triggers high-voltage capacitor to discharge and can produce instantaneous current in very short time, and this electric current satisfies the requirement of high-voltage, heavy current, when according with transformer substation and suffer thunderbolt or take place high-pressure earth fault, the operating condition of ground net, and single electric capacity is small, the price is low, convenient to use.
Example two:
the working method for realizing the detection of the grounding resistance of the grounding grid by the device comprises the following steps:
when the voltage of the first boosting transformer reaches a positive half cycle, the first capacitor is charged, and when the voltage of the first boosting transformer reaches a negative half cycle, the first capacitor and the first boosting transformer simultaneously charge the second capacitor;
after the second capacitor is charged and the ball gap switch is triggered and conducted, the second capacitor, the first current limiting resistor R1 and the grounding grid to be tested form a capacitor discharge loop;
and acquiring the discharge voltage Uc and the discharge current Ic of the second capacitor, and acquiring the grounding resistance R of the grounding grid which is Uc/Ic-R1.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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 (10)
1. The utility model provides a ground resistance detection device of transformer substation's ground net which characterized in that: the device comprises a detection power supply, a grounding end and a detection end;
the detection power supply is sequentially connected with a first capacitor and a second capacitor through a first step-up transformer, the second capacitor is respectively connected with a spherical gap switch and a first current-limiting resistor, the spherical gap switch is connected with a grounding end, and the first current-limiting resistor is connected with a detection end; the second capacitor, the first current-limiting resistor and the grounding grid to be tested form a capacitor discharge loop; the grounding resistance R of the grounding grid is Uc/Ic-R1, Uc and Ic are the discharge voltage and discharge current of the second capacitor, respectively, and R1 is the resistance of the first current limiting resistor.
2. The grounding resistance detection device of the transformer substation grounding grid of claim 1, characterized in that: the grounding end is a grounding nail driven into the ground, and the detection end is a position to be detected of the grounding grid.
3. The grounding resistance detection device of the transformer substation grounding grid of claim 1, characterized in that: and a second current-limiting resistor is connected between the first boosting transformer and the first capacitor, and the first capacitor is connected with a second capacitor through a second rectifying module and a third current-limiting resistor which are sequentially arranged.
4. The grounding resistance detection device of the substation grounding grid of claim 3, characterized in that: and a first rectifying module is connected on a line between the first capacitor and the second rectifying module and is connected with the detection power supply.
5. The grounding resistance detection device of the transformer substation grounding grid of claim 1, characterized in that: the spherical gap switch comprises an upper hemisphere and a lower hemisphere which are arranged in parallel and have a gap, the upper hemisphere is connected with the second capacitor, and the lower hemisphere is connected with the grounding end; the middle part of the lower hemisphere is provided with a hole, the needle electrode is connected in the hole through an insulating layer, and the needle electrode is positioned in the center of the hole.
6. The grounding resistance detection device of the transformer substation grounding grid of claim 1, characterized in that: the ball gap switch is a discharge trigger switch of a capacitance discharge loop, and the discharge is realized by generating a trigger signal through a signal generating circuit.
7. The grounding resistance detection device of the transformer substation grounding grid of claim 6, characterized in that: the signal generating circuit comprises an inverter, an input port of the inverter is connected with the direct-current power supply sequentially through a fifth resistor and a fourth resistor, the inverter is connected with the fourth resistor sequentially through a third capacitor and a switch, and the inverter is further connected with the direct-current power supply through a diode.
8. The grounding resistance detection device of the substation grounding grid of claim 7, characterized in that: the output port of the inverter is connected with the gate G of the IGBT, when the trigger signal is output, the collector C and the emitter E of the IGBT are conducted, and a circuit between the fourth rectifying module and the fourth capacitor is connected with the detection power supply through the conducted IGBT.
9. The grounding resistance detection device of the substation grounding grid of claim 8, characterized in that: the detection power supply is connected with a fourth capacitor through a second step-up transformer, a sixth current-limiting resistor and a fourth rectifying module in sequence, and the fourth capacitor is connected with the lower hemisphere of the spherical gap switch through a seventh resistor.
10. The working method for realizing the detection of the grounding resistance of the grounding grid based on the device of any one of claims 1 to 9 comprises the following steps:
when the voltage of the first boosting transformer reaches a positive half cycle, the first capacitor is charged, and when the voltage of the first boosting transformer reaches a negative half cycle, the first capacitor and the first boosting transformer charge the second capacitor simultaneously;
after the second capacitor is charged, the ball gap switch is triggered to be conducted, the second capacitor, the first current limiting resistor and the grounding grid to be tested form a conducted capacitor discharging loop, and the second capacitor discharges the capacitor discharging loop;
and acquiring the discharge voltage Uc and the discharge current Ic of the second capacitor, wherein the grounding resistance R of the grounding grid is Uc/Ic-R1, and R1 is the resistance value of the first current-limiting resistor.
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| CN202210169270.XA CN114966218A (en) | 2022-02-23 | 2022-02-23 | Grounding resistance detection device and method for transformer substation grounding grid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117269619A (en) * | 2023-09-29 | 2023-12-22 | 国网江苏省电力有限公司宿迁供电分公司 | On-line monitoring device and method for grounding resistance based on charge-discharge characteristics of resistance-capacitance loop |
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2022
- 2022-02-23 CN CN202210169270.XA patent/CN114966218A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117269619A (en) * | 2023-09-29 | 2023-12-22 | 国网江苏省电力有限公司宿迁供电分公司 | On-line monitoring device and method for grounding resistance based on charge-discharge characteristics of resistance-capacitance loop |
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