JB/T 6461-1992 AC high voltage grounding switch opening and closing induced current test
Some standard content:
Mechanical Industry Standard of the People's Republic of China
AC High Voltage Earthing Switch Opening and Closing Inductive Current Test 1 Subject Content and Scope of Application
JB/T6461~92
This standard specifies the terms, rated parameters, test methods, test criteria and type test report of the opening and closing inductive current test of AC high voltage earthing switch.
This standard applies to AC high voltage earthing switches with rated voltage of 63kV and above and rated frequency of 50Hz with opening and closing inductive current capability.
Note: Earthing switches with rated voltage below 63kV are sometimes also required to open and close inductive current, but their inductive current rated parameters and type tests are not normal requirements for such switches, and the test can be agreed upon by the user and the manufacturer. 2 Reference standards
GB2900.1 Basic terms of electrical engineering
GB2900.20 High-voltage switchgear of electrical engineering 3 Terms
The terms adopted in this standard shall be in accordance with the provisions of GB2900.1 and GB2900.20., and the following terms shall be added. 3.1 Earthing switch for opening and closing inductive current (hereinafter referred to as earthing switch) Earthing switch with rated voltage of 63kV and above may be required to close, flow through and disconnect the inductive current generated by the coupling between adjacent live lines and power-off lines when multiple circuit transmission lines are arranged on the same tower or in parallel. 3.2 Electromagnetic induction current
The live line through which the current flows is parallel and adjacent to the power-off line; when one end of the power-off line is grounded and the other end is connected or disconnected by the grounding switch to control whether it is grounded or not, the inductive current that the grounding switch must close and disconnect. Note: The magnitude of the inductive current of the power-off line with one end grounded depends on the current of the live wire and the coupling coefficient with the live line. 3.3
Electromagnetic induction voltage
When a live line with current flowing through it is parallel to and adjacent to a power-off line, and when one end of the power-off line is grounded and the other end is grounded and separated by a grounding switch, the voltage that appears after the arc of the inductive induced current between the breaks of the grounding switch is extinguished. When one end of the line is grounded, the electromagnetic induction voltage between the breaks of the grounding switch at the other end depends on the current in the live line, the length of the grounded line part adjacent to the live line, and the coupling coefficient with the live line. 3.4Static induction current
When a live line is parallel to and adjacent to a power-off line, and one end of the power-off line is not grounded, when the other end is connected or separated by a grounding switch, the capacitive induction current that the grounding switch must close and open. Note: The capacitive induction current of a power-off line with one end grounded depends on the voltage of the live line, the length of the grounding line between the grounded end and the open end, and the coupling coefficient with the live line.
3.5 Electrostatic Induction Voltage
When the live line is parallel and adjacent to the power-off line, one end of the power-off line is not grounded, and the other end is grounded and separated by the grounding switch, the voltage that appears after the capacitive induced current channel between the grounding switch breaks is extinguished. Note: When one end of the line is not grounded, the electrostatic induced voltage between the grounding switch breaks at the other end depends on the voltage of the live line and the coupling coefficient with the live line.
Approved by the Ministry of Machinery and Electronics Industry on August 6, 1992 and implemented on January 1, 1993
4 Rated Parameters
Rated parameters are related to the conditions of the line.
JB/T6461-92
For grounding switches with a rated voltage of 63kV and above, the rated induced current and voltage may be required. According to the severity of the opening and closing operation mode, grounding switches are divided into the following two categories: Class A - Grounding switches suitable for lines with relatively short lines or lines with relatively weak coupling with adjacent live lines. Class B: Grounding switches suitable for use in long lines or lines with strong coupling with adjacent live lines. Note: In certain situations (such as long sections of the power-off line adjacent to the live line, the load on the live line is large; the operating voltage of the live line is higher than that of the power-off line), the induced current and voltage may be higher than the given rated values. In this case, the rated values should be determined by the manufacturer and the user through negotiation. 4.1. Rated induced current
The rated induced current is the maximum current that the grounding switch can break and close under the rated induced voltage. The rated values of electromagnetic induction current and electrostatic induction current should be specified separately.
The standard values of the rated induced current of the two types of grounding switches are listed in Table 1. 4.2 Rated induced voltage
Rated induced voltage The maximum power frequency voltage that the grounding switch can break and close under the rated induced current. The rated values of electromagnetic induction voltage and electrostatic induction voltage should be specified separately.
The standard values of the rated induced voltage of the two types of grounding switches are shown in Table 1. Table 1 Standard values of rated inductive current and voltage of earthing switch Electrical combination
Rated voltage
Rated electromagnetic inductive current
A (effective value)
Electromagnetic inductive voltage
kv (effective value)
Rated electrostatic inductive voltage
Rated electrostatic inductive voltage
A (effective value)
Note: Rated inductive voltage refers to single-phase or three-phase test earthing voltage value: refer to 5.4 and 5.6. 5 Test method
5.1 Arrangement and condition of the earthing switch under test
V (effective value)
The earthing switch under test shall be completely installed on its own support or on an equivalent support. Its operating mechanism shall be operated in the prescribed manner. If it is operated electrically (pneumatically, pressure reducing), it shall be operated at the lowest operating electric (pneumatic, hydraulic) pressure respectively. Before the breaking and closing tests, no-load operation should be carried out and the operating characteristics of the earthing switch, such as movement speed, opening time and closing time, should be recorded in detail.
For gas-insulated earthing switches, the test should be carried out at the lowest operating gas density. Earthing switches equipped with manual operating mechanisms can be operated by a power operating device as long as the operating speed is equal to the speed of manual operation.
If a single-phase test is carried out on one pole of a three-pole earthing switch, it must be proved that none of the following conditions is more favorable than the conditions of the complete three-pole earthing switch:
easy. Closing speed;
b. Opening speed;
JB/T6461-92
The influence of adjacent phases or adjacent live phases.
Note: If it can be proved that the range of the burn-down time electric double does not involve adjacent electric phases, the single-phase test can be sufficient to prove the breaking and closing performance of the earthing switch. If the single-phase test proves that the arc can be ejected to the adjacent live phase, the three-phase test should be carried out using the arrangement specified for the grounding switch. 5.2 Grounding of the test circuit and the grounding switch
The test circuit should be grounded through the grounding terminal of the grounding switch. 5.3 Test frequency
The grounding switch should be tested at the rated frequency, and the frequency tolerance is ±10%. 5.4 Test voltage for inductive current breaking and closing tests The test voltage before and after closing should be selected according to the appropriate power frequency recovery voltage provided on the grounding switch break. The standard value of the recovery voltage for electromagnetic induction current breaking test is shown in Table 2. For inductive breaking, the recovery voltage should be measured immediately after the current is broken; for capacitive closing, the test voltage should be measured immediately before the grounding switch contacts are connected. Generally, only single-phase tests are required. If three-phase tests are required, the difference between the test voltage of each phase and the average test voltage shall not exceed 10% of the average test voltage.
After breaking, the power recovery voltage should be maintained for at least 0.3s. Table 2 Standard values of recovery voltage for electromagnetic induction current breaking test A
Rated voltage
Working recovery voltage
(effective value)
Instantaneous recovery voltage
(peak value)
Peak time
Rated recovery voltage
(effective value)
Transient recovery voltage
(effective value)
Peak time
Recovery voltage is single-phase or three-phase test value. Note: ② The expected transient recovery voltage waveform can be a three-phase waveform or a (1-co8) waveform (see 5.6.1). The peak time is applicable to both waveforms. ④ The allowable deviation of the values in the table is: the effective value of the rated recovery voltage and the peak value of the de-energized recovery voltage are 0 to +10%, and the peak time is -10% to 0.5.5 Test current for inductive current breaking and closing tests The test current should be equal to the standard value of the rated inductive current (the allowable deviation is 0 to +10%), listed in Table 1. The breaking current should be symmetrical, and its attenuation is negligible. The contacts of the grounding switch should not be separated until the transient current caused by the closing of the circuit has decayed.
When performing three-phase breaking and closing tests, the test current should be calculated according to the average value of the three-phase current. The difference between the test current of each phase and the average test current shall not exceed 10% of the average test current. For capacitive current breaking tests, the test current waveform before the contact separation of the grounding switch should be as close to a sine wave as possible. If the ratio of the effective value of the actual current to the effective value of the fundamental component does not exceed 1.2, it is considered that this test condition has been met. Before the contacts separate, the test current should only cross zero once in each half-wave of the power frequency. 5.6 The test circuit for the induced current breaking and making test can be directly tested on site or equivalently tested in the laboratory. For laboratory tests, the transmission line can be replaced by a concentrated component consisting of capacitors, inductors and resistors.
If a three-phase test is required, each phase of the three-phase test circuit should contain the same components as the single-phase test circuit to generate appropriate test voltage and test current. The neutral point of the power supply circuit should be grounded. Note: ① Other test circuits outside of this provision that can generate the required test current, test voltage and appropriate transient recovery voltage parameters may be used. ②For field tests, the required test current and test voltage deviations may not be met. After consultation between the manufacturer and the user, the deviation requirement may not be considered. It should be noted that if a voltage transformer is connected to the grounded line for opening and closing, ferromagnetic resonance may occur, which depends on the characteristics of the transformer and the length of the grounding line.
JB/T 6461-92
5.6.1 Test circuit for electromagnetic induction current breaking and closing test The single-phase test circuit is shown in Figure 1: It consists of a power supply circuit that can generate appropriate test voltage and test current. The power factor of the circuit should not be greater than 0.15. The damping resistor R can be connected in series or in parallel with the capacitor C. Test grounding switch
Figure 1 Test circuit for electromagnetic induction current breaking and closing test The power supply voltage Ui and the inductance L value can be calculated from the values given in Table 1 to obtain the appropriate test current and power frequency recovery voltage value. The expected transient recovery voltage waveform should have a triangular oscillating wave caused by the wave impedance of the connected transmission line. However, for the convenience of testing, the transient recovery voltage is allowed to adopt a (1cos) waveform. The values of R and C can be selected according to the parameters that can produce the appropriate service recovery voltage specified in Table 2. 5.6.2 Test circuit for breaking and making test of electrostatic induction current For the convenience of laboratory test, the test circuit "or" shown in Figure 2 can be selected. Because as long as the given circuit parameter relationship is satisfied, the two circuits are equivalent.
Test circuit 1
Tested object connected to
ground switch
Test circuit
Tested object connected to
ground and switched
Figure 2 Test circuit for breaking and making test of electrostatic induction current L=z×C
LL×[C,/(C,+C,),
Ue=Ir/(oC);
C,=C[(Uc/UR) 1];
In the formula, Z.-
—Line wave impedance: 63~110kV--425a220kv-380n
330kv—325a
550kv275m
—Rated electrostatic induction current in Table 1
Rated electrostatic induction voltage in Table 1
U=[C/(C,+C)J×U or 'c=U
C,=C,[1+(C/C,)]
The power factor of the test circuit should not be greater than 0.15. For the test circuit, the parameters of the components in the test circuit (L and C,) and the voltage JB/T 646192
(Uc) value. The C value given in Table 3 and the rated electrostatic induction current and rated electrostatic induction voltage given in Table 1 can be calculated using the relationship listed in Figure 2 to obtain the appropriate test current, test voltage, appropriate surge current rating and wave impedance of the test circuit. The parameter values of the components in the test circuit I can be obtained from the values calculated from the test circuit 1 using the relationship listed in Figure 2.
The value of the resistor R should not exceed 10% of the C capacitive reactance value under the industrial load, and can be connected in series with C. However, the selected resistance value should not be greater than the wave impedance of the transmission line under test, so as not to cause non-periodic attenuation of the surge current when the grounding switch is closed. Table 3 Test circuit capacitance (C value) rated voltage for electrostatic induction current breaking and closing tests
In Table 3, the C value can be calculated using the formula C= (61)/ (xZ). Where: 1--line length, km|| tt||Z. ——Line wave impedance, a; Take: 63~110kV-425n220kv—380n
330kV3250
500kv-2750
5.7 Test operation cycle, interval and number of times Category B
For electromagnetic induction and electrostatic induction current breaking and closing tests, 10 "breaking-closing" operation cycles are carried out. Note: 10 operation cycles cannot be considered to have fully verified the electrical life. The closing operation is followed by the breaking operation, and there is at least a time interval between the two that is sufficient for the transient current to disappear. 5.8 Requirements for grounding switches during the test. The grounding switch should successfully carry out the opening and closing test without mechanical or electrical damage. During the test, sparks or metal particles are allowed to be ejected to the outside of the switch for the open-type grounding switch, but the insulation performance of the grounding switch shall not be damaged or the operator shall not be endangered; for gas-insulated grounding switches, the insulation performance of its equipment shall not be damaged. The earthing switch shall not be repaired during the test. 5.9 Requirements for earthing switches after the test
The mechanical and insulation performance of the earthing switch shall be basically the same as before the test, and the conductive circuit shall have good contact. In case of doubt, the earthing switch shall be retested for short-time withstand current and peak withstand current. As long as it does not affect the mechanical properties of the earthing switch, traces of burning and corrosion caused by arcing are allowed; the performance of the materials used for arc extinguishing (if any) is allowed to be damaged and reduced to below the normal level; the insulator is allowed to be covered with sediment caused by the decomposition of the arc extinguishing medium. Visual inspection and no-load operation of the earthing switch can usually fully verify whether the above requirements are met. After the test, the insulation between the breaks and to the ground of the gas-insulated earthing switch shall be subjected to a withstand voltage test using 80% of the rated power frequency withstand voltage or 80% of the rated operating impulse withstand voltage.
6 Test criteria
If the earthing switch under test meets the requirements specified in Articles 5.8 and 5.9 of this standard during and after the test, it shall be qualified. 7 Type test report
All type test results shall be recorded in the type test report, which shall contain sufficient data to prove that the earthing switch complies with this standard. In addition, it shall also include sufficient information to identify the main components of the earthing switch under test. The test report shall include the following information:
Test circuit;
Test current;
Test voltage;
Power frequency recovery voltage;
Expected transient recovery voltage,
Arc burning time range:
Number of breaking and closing operations;
Time when the trip line is energized (if any); Typical oscillogram or similar record;
Contact burnout.
General information on the supporting structure of the earthing switch shall also be included, and the action time of the earthing switch and the model of the operating mechanism used during the test shall be recorded.
The test report shall make a clear conclusion on whether it is qualified or not in accordance with the provisions of Chapter 6 of this standard. Additional remarks:
This standard is proposed and managed by the Quankuo High Voltage Switchgear Standardization Technical Committee. This standard is drafted by Shenyang High Voltage Switch Factory. The main drafters of this standard are Pang Shenghai, Yang Daju, Zhao Cheng, and Ke Zili.2. Test circuit for breaking and closing test of electrostatic induction current For the convenience of laboratory test, the test circuit "or" shown in Figure 2 can be selected. Because as long as the given circuit parameter relationship is satisfied, the two circuits are equivalent.
Test circuit 1
Tested object connected to
ground switch
Test circuit
Tested object connected to
ground and switched
Figure 2 Test circuit for breaking and closing test of electrostatic induction current L=z×C
LL×[C,/(C,+C,),
Ue=Ir/(oC);
C,=C[(Uc/UR)1] ;
In the formula, Z.-
—Line wave impedance: 63~110kV--425a220kv-380n
330kv—325a
550kv275m
—Rated electrostatic induction current in Table 1
Rated electrostatic induction voltage in Table 1
U=[C/(C,+C)J×U or 'c=U
C,=C,[1+(C/C,)]
The power factor of the test circuit should not be greater than 0.15. For the test circuit, the parameters of the components in the test circuit (L and C,) and the voltage JB/T 646192
(Uc) value. The C value given in Table 3 and the rated electrostatic induction current and rated electrostatic induction voltage given in Table 1 can be calculated using the relationship listed in Figure 2 to obtain the appropriate test current, test voltage, appropriate surge current rating and wave impedance of the test circuit. The parameter values of the components in the test circuit I can be obtained from the values calculated from the test circuit 1 using the relationship listed in Figure 2.
The value of the resistor R should not exceed 10% of the C capacitive reactance value under the industrial load, and can be connected in series with C. However, the selected resistance value should not be greater than the wave impedance of the transmission line under test, so as not to cause non-periodic attenuation of the surge current when the grounding switch is closed. Table 3 Test circuit capacitance (C value) rated voltage for electrostatic induction current breaking and closing tests
In Table 3, the C value can be calculated using the formula C= (61)/ (xZ). Where: 1--line length, km|| tt||Z. ——Line wave impedance, a; Take: 63~110kV-425n220kv—380n
330kV3250
500kv-2750
5.7 Test operation cycle, interval and number of times Category B
For electromagnetic induction and electrostatic induction current breaking and closing tests, 10 "breaking-closing" operation cycles are carried out. Note: 10 operation cycles cannot be considered to have fully verified the electrical life. The closing operation is followed by the breaking operation, and there is at least a time interval between the two that is sufficient for the transient current to disappear. 5.8 Requirements for grounding switches during the test. The grounding switch should successfully carry out the opening and closing test without mechanical or electrical damage. During the test, sparks or metal particles are allowed to be ejected to the outside of the switch for the open-type grounding switch, but the insulation performance of the grounding switch shall not be damaged or the operator shall not be endangered; for gas-insulated grounding switches, the insulation performance of its equipment shall not be damaged. The earthing switch shall not be repaired during the test. 5.9 Requirements for earthing switch after the test
The mechanical and insulation performance of the earthing switch shall be basically the same as before the test, and the conductive circuit shall have good contact. In case of doubt, the earthing switch shall be re-tested for short-time withstand current and peak withstand current. As long as it does not affect the mechanical properties of the earthing switch, burns and corrosion caused by arcs are allowed; the performance of the materials used for arc extinguishing (if any) is allowed to be damaged and reduced to below the normal level; the insulator is allowed to be covered with sediment caused by the decomposition of the arc extinguishing medium. Visual inspection and no-load operation of the earthing switch can usually fully verify whether the above requirements are met. After the test, the insulation between the breaks and to the ground of the gas-insulated earthing switch shall be subjected to a withstand voltage test using 80% of the rated power frequency withstand voltage or 80% of the rated operating impulse withstand voltage.
6 Test criterion
If the earthing switch under test meets the requirements specified in Articles 5.8 and 5.9 of this standard during and after the test, it shall be qualified. 7 Type test report
All type test results shall be recorded in the type test report, which shall contain sufficient data to prove that the earthing switch complies with this standard. In addition, it shall also include sufficient information to identify the main components of the earthing switch under test. The test report shall include the following information:
Test circuit;
Test current;
Test voltage;
Power frequency recovery voltage;
Expected transient recovery voltage,
Arc burning time range:
Number of breaking and closing operations;
Time when the trip line is energized (if any); Typical oscillogram or similar record;
Contact burnout.
General information on the supporting structure of the earthing switch shall also be included, and the action time of the earthing switch and the model of the operating mechanism used during the test shall be recorded.
The test report shall make a clear conclusion on whether it is qualified or not in accordance with the provisions of Chapter 6 of this standard. Additional remarks:
This standard is proposed and managed by the Quankuo High Voltage Switchgear Standardization Technical Committee. This standard is drafted by Shenyang High Voltage Switch Factory. The main drafters of this standard are Pang Shenghai, Yang Daju, Zhao Cheng, and Ke Zili.2. Test circuit for breaking and closing test of electrostatic induction current For the convenience of laboratory test, the test circuit "or" shown in Figure 2 can be selected. Because as long as the given circuit parameter relationship is satisfied, the two circuits are equivalent.
Test circuit 1
Tested object connected to
ground switch
Test circuit
Tested object connected to
ground and switchedwwW.bzxz.Net
Figure 2 Test circuit for breaking and closing test of electrostatic induction current L=z×C
LL×[C,/(C,+C,),
Ue=Ir/(oC);
C,=C[(Uc/UR)1] ;
In the formula, Z.-
—Line wave impedance: 63~110kV--425a220kv-380n
330kv—325a
550kv275m
—Rated electrostatic induction current in Table 1
Rated electrostatic induction voltage in Table 1
U=[C/(C,+C)J×U or 'c=U
C,=C,[1+(C/C,)]
The power factor of the test circuit should not be greater than 0.15. For the test circuit, the parameters of the components in the test circuit (L and C,) and the voltage JB/T 646192
(Uc) value. The C value given in Table 3 and the rated electrostatic induction current and rated electrostatic induction voltage given in Table 1 can be calculated using the relationship listed in Figure 2 to obtain the appropriate test current, test voltage, appropriate surge current rating and wave impedance of the test circuit. The parameter values of the components in the test circuit I can be obtained from the values calculated from the test circuit 1 using the relationship listed in Figure 2.
The value of the resistor R should not exceed 10% of the C capacitive reactance value under the industrial load, and can be connected in series with C. However, the selected resistance value should not be greater than the wave impedance of the transmission line under test, so as not to cause non-periodic attenuation of the surge current when the grounding switch is closed. Table 3 Test circuit capacitance (C value) rated voltage for electrostatic induction current breaking and closing tests
In Table 3, the C value can be calculated using the formula C= (61)/ (xZ). Where: 1--line length, km|| tt||Z. ——Line wave impedance, a; Take: 63~110kV-425n220kv—380n
330kV3250
500kv-2750
5.7 Test operation cycle, interval and number of times Category B
For electromagnetic induction and electrostatic induction current breaking and closing tests, 10 "breaking-closing" operation cycles are carried out. Note: 10 operation cycles cannot be considered to have fully verified the electrical life. The closing operation is followed by the breaking operation, and there is at least a time interval between the two that is sufficient for the transient current to disappear. 5.8 Requirements for grounding switches during the test. The grounding switch should successfully carry out the opening and closing test without mechanical or electrical damage. During the test, sparks or metal particles are allowed to be ejected to the outside of the switch for the open-type grounding switch, but the insulation performance of the grounding switch shall not be damaged or the operator shall not be endangered; for gas-insulated grounding switches, the insulation performance of its equipment shall not be damaged. The earthing switch shall not be repaired during the test. 5.9 Requirements for earthing switch after the test
The mechanical and insulation performance of the earthing switch shall be basically the same as before the test, and the conductive circuit shall have good contact. In case of doubt, the earthing switch shall be re-tested for short-time withstand current and peak withstand current. As long as it does not affect the mechanical properties of the earthing switch, burns and corrosion caused by arcs are allowed; the performance of the materials used for arc extinguishing (if any) is allowed to be damaged and reduced to below the normal level; the insulator is allowed to be covered with sediment caused by the decomposition of the arc extinguishing medium. Visual inspection and no-load operation of the earthing switch can usually fully verify whether the above requirements are met. After the test, the insulation between the breaks and to the ground of the gas-insulated earthing switch shall be subjected to a withstand voltage test using 80% of the rated power frequency withstand voltage or 80% of the rated operating impulse withstand voltage.
6 Test criterion
If the earthing switch under test meets the requirements specified in Articles 5.8 and 5.9 of this standard during and after the test, it shall be qualified. 7 Type test report
All type test results shall be recorded in the type test report, which shall contain sufficient data to prove that the earthing switch complies with this standard. In addition, it shall also include sufficient information to identify the main components of the earthing switch under test. The test report shall include the following information:
Test circuit;
Test current;
Test voltage;
Power frequency recovery voltage;
Expected transient recovery voltage,
Arc burning time range:
Number of breaking and closing operations;
Time when the trip line is energized (if any); Typical oscillogram or similar record;
Contact burnout.
General information on the supporting structure of the earthing switch shall also be included, and the action time of the earthing switch and the model of the operating mechanism used during the test shall be recorded.
The test report shall make a clear conclusion on whether it is qualified or not in accordance with the provisions of Chapter 6 of this standard. Additional remarks:
This standard is proposed and managed by the Quankuo High Voltage Switchgear Standardization Technical Committee. This standard is drafted by Shenyang High Voltage Switch Factory. The main drafters of this standard are Pang Shenghai, Yang Daju, Zhao Cheng, and Ke Zili.9 Requirements for earthing switches after the test
The mechanical and insulation performance of the earthing switch should be basically the same as before the test, and the conductive circuit should have good contact. In case of doubt, the earthing switch should be re-tested for short-time withstand current and peak withstand current. As long as it does not affect the mechanical properties of the earthing switch, traces of burning and corrosion caused by arcing are allowed; the performance of the materials used for arc extinguishing (if any) is allowed to be damaged and reduced to below the normal level; the insulator is allowed to be covered with sediment caused by the decomposition of the arc extinguishing medium. Visual inspection and no-load operation of the earthing switch can usually fully verify whether the above requirements are met. After the test, the insulation between the breaks and to the ground of the gas-insulated earthing switch should be subjected to a withstand voltage test using 80% of the rated power frequency withstand voltage or 80% of the rated operating impulse withstand voltage.
6 Test criteria
If the tested earthing switch meets the requirements of Articles 5.8 and 5.9 of this standard during and after the test, it is considered to have passed the test. 7 Type test report
All type test results shall be recorded in the type test report, which shall contain sufficient data to prove that the earthing switch complies with this standard. In addition, it shall also include sufficient information to identify the main components of the earthing switch under test. The test report shall include the following information:
Test circuit;
Test current;
Test voltage;
Power frequency recovery voltage;
Expected transient recovery voltage,
Arc burning time range:
Number of breaking and closing operations;
Time when the trip line is energized (if any); Typical oscillogram or similar record;
Contact burnout.
General information on the supporting structure of the earthing switch shall also be included, and the action time of the earthing switch and the model of the operating mechanism used during the test shall be recorded.
The test report shall make a clear conclusion on whether it is qualified or not in accordance with the provisions of Chapter 6 of this standard. Additional remarks:
This standard is proposed and managed by the Quankuo High Voltage Switchgear Standardization Technical Committee. This standard is drafted by Shenyang High Voltage Switch Factory. The main drafters of this standard are Pang Shenghai, Yang Daju, Zhao Cheng, and Ke Zili.9 Requirements for earthing switches after the test
The mechanical and insulation performance of the earthing switch should be basically the same as before the test, and the conductive circuit should have good contact. In case of doubt, the earthing switch should be re-tested for short-time withstand current and peak withstand current. As long as it does not affect the mechanical properties of the earthing switch, burns and corrosion caused by arcs are allowed; the performance of the materials used for arc extinguishing (if any) is allowed to be damaged and reduced to below the normal level; the insulator is allowed to be covered with sediment caused by the decomposition of the arc extinguishing medium. Visual inspection and no-load operation of the earthing switch can usually fully verify whether the above requirements are met. After the test, the insulation between the breaks and to the ground of the gas-insulated earthing switch should be subjected to a withstand voltage test using 80% of the rated power frequency withstand voltage or 80% of the rated operating impulse withstand voltage.
6 Test criteria
If the tested earthing switch meets the requirements of Articles 5.8 and 5.9 of this standard during and after the test, it is considered to have passed the test. 7 Type test report
All type test results shall be recorded in the type test report, which shall contain sufficient data to prove that the earthing switch complies with this standard. In addition, it shall also include sufficient information to identify the main components of the earthing switch under test. The test report shall include the following information:
Test circuit;
Test current;
Test voltage;
Power frequency recovery voltage;
Expected transient recovery voltage,
Arc burning time range:
Number of breaking and closing operations;
Time when the trip line is energized (if any); Typical oscillogram or similar record;
Contact burnout.
General information on the supporting structure of the earthing switch shall also be included, and the action time of the earthing switch and the model of the operating mechanism used during the test shall be recorded.
The test report shall make a clear conclusion on whether it is qualified or not in accordance with the provisions of Chapter 6 of this standard. Additional remarks:
This standard is proposed and managed by the Quankuo High Voltage Switchgear Standardization Technical Committee. This standard is drafted by Shenyang High Voltage Switch Factory. The main drafters of this standard are Pang Shenghai, Yang Daju, Zhao Cheng, and Ke Zili.
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