CN114935694A - Cable line cross interconnection loop metal shielding resistor live-line detection system and method - Google Patents
Cable line cross interconnection loop metal shielding resistor live-line detection system and method Download PDFInfo
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- G—PHYSICS
- 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
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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Abstract
The invention relates to a cable line cross interconnection loop metal shielding resistance live-line detection system and a method, wherein the system comprises: voltage excitation assembly (1): the circuit is used for applying two groups of excitation voltage signals with different frequencies to a branch circuit (0) to be tested in the cross interconnection loop; current measurement assembly (2): the current signal is used for measuring the current signal generated in the branch circuit (0) to be tested to which the excitation voltage signal is currently applied; central processing unit (3): and synchronously acquiring the excitation voltage signal and the corresponding current signal waveform thereof, and automatically calculating the resistance value of each branch (0) to be detected in the cross interconnection loop according to the line equivalent impedance relation. Compared with the prior art, the method can quickly realize reliable and accurate measurement of the metal shielding resistance of the cross interconnection loop, accurately evaluate the defect state of the metal shielding and provide a reference basis for operation and maintenance of the cable line.
Description
Technical Field
The invention relates to the technical field of cable live-line detection, in particular to a system and a method for detecting a metal shielding resistor of a cable line cross interconnection loop in a live-line manner.
Background
The cross-connection loop metal shield of the cable line is an important component of a cable system and comprises the following components: the cable comprises a cable metal sleeve, an accessory copper shell or tail pipe, an intermediate joint bridging line, a grounding wire and crimping and fastening of all parts. Any poor connection, such as loose bolt, insufficient solder joint, and poor lead sealing, will cause the loop resistance to increase. Even a slight increase in resistance can have serious consequences. For example: the poor welding of cable metal covering and copper braided wire makes the return circuit resistance increase 0.1 omega, under 10kA short circuit current effect, the power of generating heat is 10MW in the twinkling of an eye in this place, makes local temperature rise, burns the cable main insulation, causes the cable to puncture near joint or tail pipe. If the resistance is further increased, the short-circuit current value is limited, and the trip time is prolonged, thereby causing fire.
In the past, attention on metal shielding of a cross interconnection loop is not enough, and operation faults and fire phenomena caused by the defect of poor connection of the metal shielding of a cable system are frequent, so that the metal shielding is a main defect influencing safe operation of a cable line. Therefore, it is very important to design a metal shielding (metal sleeve) resistance live-line detection system for a cross-connection loop of a cable line.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a live detection system for a metal shielding resistor of a cross interconnection loop of a cable line.
The purpose of the invention can be realized by the following technical scheme:
a system for detecting live metal shield resistance in a cross-linked loop of a cable run, the system comprising:
the voltage excitation component: the circuit comprises a cross interconnection loop, a voltage detection circuit and a control circuit, wherein the cross interconnection loop is used for applying two groups of excitation voltage signals with different frequencies to a branch to be detected in the cross interconnection loop;
a current measurement component: the current signal is used for measuring a current signal generated in a branch to be tested to which an excitation voltage signal is currently applied;
a central processing unit: and synchronously acquiring the excitation voltage signal and the corresponding current signal waveform thereof, and automatically calculating the resistance value of each branch to be measured in the cross interconnection loop according to the line equivalent impedance relational expression.
Preferably, the voltage excitation assembly comprises an excitation signal source for generating excitation voltage, and an excitation sensor for coupling the excitation voltage to a voltage application point of a branch to be detected and collecting voltage waveform in a voltage application point line, the excitation signal source is an alternating current voltage source, the excitation sensor is a voltage sensor, the excitation sensor is installed in a corresponding copper bar in a cross interconnection box or a direct grounding box of the branch to be detected, and the excitation sensor is a non-contact coupling sensor.
Preferably, the voltage excitation assembly further comprises a wave trap for suppressing interference of operating frequency current and voltage in the line to the excitation signal source, and the wave trap is arranged between the excitation signal source and the excitation sensor.
Preferably, the voltage driving component further includes a power control circuit for dynamically controlling the output power of the driving signal source and a frequency selective switch for selecting the output frequency of the driving signal source, and both the power control circuit and the frequency selective switch are connected to the driving signal source and the central processor.
Preferably, the current measuring assembly comprises a measuring sensor, a filter and a current waveform collecting circuit which are connected in sequence, the measuring sensor is arranged on a corresponding copper bar in a branch cross interconnection box or a direct grounding box to be measured, the measuring sensor is a non-contact coupling sensor, and the filter and the current waveform collecting circuit are connected to the central processing unit.
Preferably, the voltage excitation assembly and the current measurement assembly are arranged in a group, and the branch to be measured is replaced in a manual adjustment mode.
Preferably, the voltage excitation assembly and the current measurement assembly are provided with three groups, and are respectively connected with the A, B and C three-phase branches to be tested, and during testing, the three-phase branches to be tested are tested phase by phase.
Preferably, the system further comprises a wireless transmission module, and the central processing unit is connected with the mobile intelligent terminal through the wireless transmission module.
Preferably, the system further comprises an alarm module for alarming when the resistance of the branch to be tested is abnormal and alarming when the branch to be tested is over-voltage or over-current, wherein the alarm module comprises an acousto-optic alarm.
A method for detecting the electrification of a metal shielding resistor of a cable line cross interconnection loop is based on a detection system and comprises the following steps:
testing the three-phase test branches A, B and C of the cable line cross interconnection loop phase by phase;
after all excitation voltage signals and current signal waveforms corresponding to the excitation voltages of the three-phase branches to be tested are obtained, a line equivalent impedance equation set is constructed, and the resistance value of each branch to be tested is solved;
and evaluating the defect state of the metal shielding resistance of each branch to be tested according to the cross interconnection metal shielding resistance criterion, and providing operation and maintenance strategies and measures of the cable line.
Compared with the prior art, the invention has the following advantages:
(1) the measuring system and the method provided by the invention are nondestructive testing, and the normal running state of the cable is not influenced in the whole testing process;
(2) according to the measuring system provided by the invention, an excitation voltage signal is injected into the metal shield through the excitation sensor in a coupling manner, the current and voltage parameters of the corresponding loop are synchronously acquired, the equivalent impedance equation group is constructed to calculate the resistance value of the branch to be measured, the loop metal shield resistance can be quickly and reliably detected in the cable running state, the defect state is evaluated, and the operation and maintenance strategy and measures of the cable line are provided;
(3) the excitation sensor can measure the voltage waveform in a voltage application point line, control the output power of an excitation signal source through the power control circuit, select the output frequency of the excitation signal source through the frequency selection switch, dynamically adjust the power and the frequency of the excitation signal according to the power frequency current and interference signal conditions in the measured line by the detection system, improve the output energy of the excitation signal, and avoid and inhibit external interference to the maximum extent by matching with the filter circuit, thereby realizing the reliable and accurate measurement of the resistance in a charged state;
(4) the invention has stronger anti-interference power inhibition capability, and can realize the high-precision measurement of milliohm (m omega) level alternating current resistance under the interference of up to 300V power frequency induction voltage and hundreds of amperes (A) power frequency current;
(5) the detection system provided by the invention can alarm in time and act quickly under external overvoltage or overcurrent, so that the safety of measuring personnel and the detection system is guaranteed;
(6) the excitation sensor and the measurement sensor are both arranged in the cross interconnection box of the branch to be measured or on the copper bar in the direct grounding box in a non-contact coupling mode, and are not directly electrically connected with the copper bar, so that the personal safety in the process of measuring and wiring is ensured, and meanwhile, the electrical connection mode of the metal shielding of a cable line is not changed;
(7) the invention has the remote telemetering function, and the system is in wireless connection with the intelligent mobile terminal, thereby realizing remote control, measurement and data storage, and being safer and more convenient.
Drawings
Fig. 1 is a schematic structural diagram of a live detection system for a metal shielding resistor of a cross-connection loop of a cable line according to the present invention;
fig. 2 is a schematic view of a metallic shield (metallic sheath) of a cross-connect loop of a cable run in an embodiment of the invention;
FIG. 3 is a schematic diagram of a metal socket of a cable according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a detection system for detecting live metal shielding resistance of a cross-connection loop of a cable line.
In the figure, 0 is a test branch, 1 is a voltage excitation component, 2 is a current measurement component, 3 is a central processing unit, 4 is an early warning module, 5 is a wireless transmission module, 6 is a mobile intelligent terminal, 11 is an excitation signal source, 12 is a wave trap, 13 is an excitation sensor, 14 is a power control/frequency selection module, 21 is a measurement sensor, 22 is a filter, 23 is a current waveform acquisition circuit, 131 is a first excitation sensor, 132 is a second excitation sensor, 133 is a third excitation sensor, 211 is a first measurement sensor, 212 is a second measurement sensor, and 213 is a third measurement sensor.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Examples
The embodiment provides a cable run alternately electrified detecting system of interconnected loop metallic shield resistance, is a portable equipment, including high protection engineering plastics box and built-in measurement system, intelligent Mobile terminal and APP measurement analysis software.
As shown in fig. 1, the system for detecting live metal shielding resistance of a cross-connected loop of a cable line provided in this embodiment includes:
voltage excitation assembly 1: the device is used for applying two groups of excitation voltage signals with different frequencies to a branch circuit 0 to be tested in the cross interconnection loop;
current measurement assembly 2: the current signal is used for measuring the current signal generated in the branch circuit 0 to be tested to which the excitation voltage is currently applied;
the central processing unit 3: and synchronously acquiring excitation voltage signals and corresponding current signal waveforms including parameters such as amplitude, phase and the like, and automatically calculating the resistance value of each branch circuit to be detected 0 in the cross interconnection loop according to the line equivalent impedance relational expression.
The following is a detailed description of the various components of the system:
the voltage excitation assembly 1 comprises an excitation signal source 11 for generating excitation voltage, and an excitation sensor 13 for coupling the excitation voltage to a voltage application point of a branch circuit 0 to be detected and collecting voltage waveform in a voltage application point circuit, wherein the excitation signal source 11 is an alternating current voltage source, the excitation sensor 13 is a voltage sensor, the excitation sensor 13 is installed on a corresponding copper bar in a cross interconnection box or a direct grounding box of the branch circuit 0 to be detected, the excitation sensor 13 is a non-contact coupling sensor, and the excitation sensor 13 adopts a non-contact coupling mode to couple signals and is not directly electrically connected with the copper bar. The voltage excitation assembly 1 further comprises a wave trap 12 for suppressing interference of operating frequency current and voltage in the line to the excitation signal source 11, and the wave trap 12 is arranged between the excitation signal source 11 and the excitation sensor 13. The voltage excitation assembly 1 further includes a power control/frequency selection module 14, which specifically includes a power control circuit for controlling the output power of the excitation signal source 11 and a frequency selection switch for selecting the output frequency of the excitation signal source 11, and the power control circuit and the frequency selection switch are both connected to the excitation signal source 11 and the central processing unit 3. Therefore, the system has the function of dynamically adjusting the power and the frequency of the excitation signal, the output power adjustment range is 1W-3W, and the output frequency adjustment range is 10 Hz-1000 Hz; the system firstly outputs an excitation signal with default power and frequency, and automatically adjusts the output power according to the initial resistance value of the tested loop; and automatically adjusting the output frequency according to the working frequency current and the interference signal condition of the tested loop until the finally measured resistance value is stable. The characteristics of the output excitation signal are adjusted according to the current detected loop condition, impedance matching is continuously carried out, and the accuracy of resistance measurement can be greatly improved.
The current measuring assembly 2 comprises a measuring sensor 21, a filter 22 and a current waveform collecting circuit 23 which are connected in sequence, the measuring sensor 21 is installed on a copper bar corresponding to the branch circuit 0 to be measured in a cross interconnection box or a direct grounding box, the measuring sensor 21 is a non-contact coupling sensor, the measuring sensor 21 adopts a non-contact mode to sample signals, the copper bar is not directly electrically connected, and the filter 22 and the current waveform collecting circuit 23 are both connected to the central processing unit 3.
In this embodiment, as the most preferred embodiment, three groups of voltage excitation components 1 and three groups of current measurement components 2 are arranged, and are respectively connected to the three-phase branch to be tested 0, B, and C, and during testing, the three-phase branch to be tested 0 is tested phase by phase. That is to say: the system is provided with 3 excitation sensors 13 and 3 measuring sensors 21, wherein the 3 excitation sensors 13 and the 3 measuring sensors 21 are respectively arranged on A, B, C interconnected copper bars in a cross interconnection box, the excitation sensors 13 are coupled to output pilot frequency excitation voltage signals, and the measuring sensors 21 are coupled to sample pilot frequency current signals.
In other embodiments, the voltage excitation component 1 and the current measurement component 2 are provided in a group, and the branch 0 to be measured is replaced by a manual adjustment mode. That is, the whole system can be configured with only 1 excitation sensor 13 and 1 measurement sensor 21, and during testing, the installation positions of the excitation sensor 13 and the measurement sensor 21 are manually changed, so as to realize testing in different branches to be tested 0.
In the embodiment, the inner diameters of the excitation sensor 13 and the measurement sensor 21 are not less than 50mm, and the excitation sensor 13 is connected with the wave trap 12 to inhibit the influence of power frequency current and voltage on the excitation signal source 11; the measuring sensor 21 is connected with a filter 22 for filtering power frequency and other interference signals in the effective signal. Due to the fact that the wave trapper 12 is arranged, the system has a wave trapping function, interference of hundreds of amperes (A) power frequency current in a loop on the excitation signal source 11 is effectively restrained, and safe and reliable operation and accurate output of excitation signals are achieved. In addition, because the filter 22 is arranged, the system has a filtering function, the power frequency current and interference signals of hundreds of amperes (A) are restrained, and accurate measurement of specific frequency signals is realized.
The central processing unit 3 adopts a common microprocessor with a digital processing function on the market, such as an ARM or a DSP, the central processing unit 3 controls the excitation signal source 11 to output excitation signals of default power and frequency, the central processing unit 3 sends power and frequency instructions to the power control circuit and the frequency selection switch, adjusts the power and frequency of the excitation signals to output again according to the state of the branch circuit 0 to be tested, and records the waveform of the excitation voltage signal at the moment, including the amplitude and the phase parameter, so as to perform test calculation, and obtain the resistance value of the branch circuit 0 to be tested.
In addition, the system also comprises a wireless transmission module 5, the central processing unit 3 is connected with a mobile intelligent terminal 6 through the wireless transmission module 5, so that the system has a remote telemetry function, the system is in wireless connection with the intelligent mobile terminal, remote control, measurement and data storage are realized, and the operation is safer and more convenient.
In addition, the system also comprises an alarm module 4 which is used for the abnormal resistance test alarm of the branch circuit 0 to be tested and the over-voltage or over-current alarm in the branch circuit 0 to be tested, wherein the alarm module 4 comprises an acousto-optic early warning device and the like. When external overvoltage or overcurrent occurs, the device can act quickly, and the safety of a measuring system, a measured cable and measuring personnel is ensured.
Based on the above detection system, this embodiment further provides a method for detecting the live state of the metal shielding resistor in the cross-connection loop of the cable line, where the method is based on the detection system and includes the following steps:
testing the three-phase branch circuit to be tested 0 of the cross interconnection loops A, B and C of the cable line phase by phase;
after all voltage signals and current signal waveforms corresponding to the excitation voltage of the three-phase branch (0) to be tested are obtained, characteristic parameters including amplitude, phase and the like are included, a line equivalent impedance equation set is constructed, and the resistance value of each branch (0) to be tested is solved;
evaluating the defect state of the metal shielding resistor of each branch (0) to be tested according to the criterion of the cross interconnection metal shielding resistor, and providing operation and maintenance strategies and measures of the cable line, specifically, determining the defect state of the metal shielding resistor according to the set resistance range of the cross interconnection metal shielding resistor, and providing the operation and maintenance strategies and measures of the cable line.
The following describes the specific process of the detection system:
fig. 2 is a schematic diagram of a metal shield (metal sheath) of a cross-connection loop of a cable line, and only a schematic diagram of a connection of the metal sheath of the cable is shown in order to make a model clearer, as shown in fig. 3.
The arrangement of the excitation sensor 13 and the measurement sensor 21 when performing a test using the above-described test system is shown in fig. 4.
Definition A 1 B 2 C 3 Branch 1, branch 1 impedance Z 1 ＝R 1 +jwL 1 ； (1)
Definition B 1 C 2 A 3 Branch 2, branch 2 impedance Z 2 ＝R 2 +jwL 2 ； (2)
Definition ofC 1 A 2 B 3 Branch 3, branch 3 impedance Z 3 ＝R 3 +jwL 3 ； (3)
When the first excitation sensor 131 and the first measurement sensor 211 detect in the branch 1, the branch 2 and the branch 3 are connected in parallel to form a detection current loop with the branch 1, that is:
the detection at 2 different frequencies results in the following different equations (4), (5), namely:
when second excitation sensor 132 and second measurement sensor 212 detect in branch 2, branch 1 and branch 3 are connected in parallel to form a detection current loop with branch 2, that is:
the detection at 2 different frequencies results in the following 2 different equations (6), (7), namely:
when the third excitation sensor 133 and the third measurement sensor 213 detect in the branch 3, the branch 1 and the branch 2 are connected in parallel and then form a detection current loop with the branch 3, that is:
the detection at 2 different frequencies results in the following 2 different equations (8), (9), namely:
solving simultaneous equations (1) - (9) to respectively obtain resistance values R of the branch 1, the branch 2 and the branch 3 1 、R 2 、R 3 The connection state of the metal shield (metal sleeve) is judged according to the resistance value.
If necessary, the potential defect position of the defect phase can be accurately fixed (such as on a tail pipe, a joint lead sealing position and the like).
Finally, it is to be noted that: the system and the method are not limited to the live detection of the metal shielding (metal sleeve) resistor of the cable line cross interconnection loop, and can also be used for power failure detection.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. A cable run cross-connect loop metal-shield resistance live detection system, the system comprising:
voltage excitation assembly (1): the circuit is used for applying two groups of excitation voltage signals with different frequencies to a branch circuit (0) to be tested in the cross interconnection loop;
current measurement assembly (2): the current signal is used for measuring the current signal generated in the branch circuit (0) to be tested to which the excitation voltage signal is currently applied;
central processor (3): and synchronously acquiring the excitation voltage signal and the corresponding current signal waveform thereof, and automatically calculating the resistance value of each branch (0) to be detected in the cross interconnection loop according to the line equivalent impedance relation.
2. The system for detecting the live line of the metal shielding resistor of the cross-connection loop of the cable line according to claim 1, wherein the voltage excitation assembly (1) comprises an excitation signal source (11) for generating an excitation voltage, and an excitation sensor (13) for coupling the excitation voltage to a voltage application point of a branch (0) to be detected and collecting a voltage waveform in a line of the voltage application point, the excitation signal source (11) is an alternating current voltage source, the excitation sensor (13) is a voltage sensor, the excitation sensor (13) is installed in a cross-connection box of the branch (0) to be detected or on a corresponding copper bar in a direct grounding box, and the excitation sensor (13) is a non-contact type coupling sensor.
3. The metal-shielded resistance live detection system for the cross-connection loop of the cable line as claimed in claim 2, wherein the voltage excitation assembly (1) further comprises a wave trap (12) for suppressing interference of an operating frequency current and a voltage in the cable line with the excitation signal source (11), and the wave trap (12) is disposed between the excitation signal source (11) and the excitation sensor (13).
4. The system for detecting the live wire of the metal shielding resistor of the cross-linked loop of the cable line as claimed in claim 2, wherein the voltage excitation assembly (1) further comprises a power control circuit for dynamically controlling the output power of the excitation signal source (11) and a frequency selective switch for selecting the output frequency of the excitation signal source (11), and the power control circuit and the frequency selective switch are both connected to the excitation signal source (11) and the central processor (3).
5. The electrified detection system of cable run cross-connection loop metal shielding resistance of claim 1, characterized in that, the current measurement assembly (2) comprises a measurement sensor (21), a filter (22) and a current waveform acquisition circuit (23) which are connected in sequence, the measurement sensor (21) is installed on a corresponding copper bar in a cross-connection box or a direct grounding box of a branch (0) to be measured, the measurement sensor (21) is a non-contact coupling sensor, and the filter (22) and the current waveform acquisition circuit (23) are both connected to the central processing unit (3).
6. The live detection system for the metal shielding resistor of the cross-connection loop of the cable line as claimed in claim 1, wherein the voltage excitation component (1) and the current measurement component (2) are provided in a group, and the branch (0) to be detected is replaced in a manual adjustment mode.
7. The electrified detection system of the metal shielding resistor of the cross-connection interconnection loop of the cable line as claimed in claim 1, wherein the voltage excitation assembly (1) and the current measurement assembly (2) are arranged in three groups and respectively connected with the three-phase branches (0) to be tested, and during testing, the three-phase branches (0) to be tested are tested phase by phase.
8. The system for detecting the live wire of the metal shielding resistor of the cross-connection loop of the cable line as claimed in claim 1, further comprising a wireless transmission module (5), wherein the central processing unit (3) is connected with the mobile intelligent terminal (6) through the wireless transmission module (5).
9. The live detection system for the metal shielding resistor of the cross-connection loop of the cable line as claimed in claim 1, further comprising an alarm module (4) for alarming the abnormal resistance test of the branch (0) to be tested, and alarming the overvoltage or overcurrent in the branch (0), wherein the alarm module (4) comprises an audible and visual alarm.
10. A method for detecting the live state of a metal shielding resistor of a cross interconnection loop of a cable line is characterized in that the method is based on the detection system of any one of claims 1 to 9 and comprises the following steps:
testing the three-phase test branch circuits (0) of the cross interconnection loops A, B and C of the cable line phase by phase;
after all excitation voltage signals and current signal waveforms corresponding to the excitation voltage of the three-phase branch (0) to be tested are obtained, a line equivalent impedance equation set is constructed, and the resistance value of each branch (0) to be tested is solved;
and evaluating the defect state of the metal shielding resistance of each branch (0) to be tested according to the cross interconnection metal shielding resistance criterion, and providing operation and maintenance strategies and measures of the cable line.
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| CN202210459617.4A CN114935694A (en) | 2022-04-28 | 2022-04-28 | Cable line cross interconnection loop metal shielding resistor live-line detection system and method |
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| CN202210459617.4A CN114935694A (en) | 2022-04-28 | 2022-04-28 | Cable line cross interconnection loop metal shielding resistor live-line detection system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115656630A (en) * | 2022-09-29 | 2023-01-31 | 江苏省电力试验研究院有限公司 | High-precision testing method and device for loop resistance of cable cross-connection grounding system |
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2022
- 2022-04-28 CN CN202210459617.4A patent/CN114935694A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115656630A (en) * | 2022-09-29 | 2023-01-31 | 江苏省电力试验研究院有限公司 | High-precision testing method and device for loop resistance of cable cross-connection grounding system |
| CN115656630B (en) * | 2022-09-29 | 2024-02-13 | 江苏省电力试验研究院有限公司 | High-precision testing method and device for loop resistance of cable cross-connection grounding system |
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