Insulation and conductivity test connecting device of insulation circuit breaker and test method

Abstract

The invention relates to the technical field of electrical engineering, and discloses an insulation and conductivity test connecting device and a test method for an insulation circuit breaker, a mode that a connecting main body, a test device connecting line and a residual current protection device are connected is adopted, and the connecting main body is compact in design and can be reasonably arranged in a limited space; the connecting line of the testing device is good in flexibility and can flexibly bypass an obstacle to connect a testing point. Meanwhile, the residual current protection device can accurately monitor the current, cut off an abnormal circuit in time, and guarantee the test safety. The three parts cooperate with each other, so that the structural integrity of the equipment is prevented from being damaged, the measurement error is effectively reduced, and the insulation and conductivity test can be efficiently and accurately completed in a narrow space.

Description

Technical Field

[0001] The invention relates to the technical field of electrical engineering, and in particular to an insulation and conductivity performance test connection device and a test method for an insulating circuit breaker. Background Art

[0002] According to the "Preventive Test Procedure for Power Equipment" (DL / T 596-2021), the conductive circuit resistance of 10kV SF6 fully insulated circuit breakers needs to be measured every 6 years or when necessary. The circuit resistance shall not exceed 110% of the acceptance test value and shall not exceed the value specified in the product technical documents. At the same time, phase comparison should be performed and there should be no obvious difference. 10kV SF6 fully insulated circuit breakers need to undergo AC withstand voltage test after Class A maintenance or when necessary. 10kV power cables also need to undergo AC withstand voltage test and partial discharge test after Class A maintenance or when necessary.

[0003] However, in the prior art, for 10kV SF6 fully insulated circuit breaker cabinets, due to its small operating space, when conducting a conductive performance test, removing the cable terminal head will cause the outlet bolts to deform, and the small contact surface between the wire clamp and the bolt will result in a large measurement error. When conducting an insulation performance test, the test wire clamp is prone to discharge the semiconductor of the cable terminal head, and it cannot be tested if the terminal head is removed. Therefore, there is an urgent need for an insulation and conductive performance test connection device for an insulated circuit breaker that can overcome the problem of small operating space and ensure the accuracy of the conductive performance test and the integrity of the insulation performance test. Summary of the invention

[0004] The present invention provides an insulation and conductivity performance test connection device and a test method for an insulated circuit breaker, which solves the technical problem that the insulation and conductivity performance test cannot be effectively completed without destroying the structural integrity of the equipment and affecting the measurement accuracy due to the small operating space of a 10kV SF6 fully insulated circuit breaker cabinet.

[0005] A first aspect of the present invention provides an insulation and conductivity performance test connection device for an insulating circuit breaker, comprising a connection body, a test device connection line and a residual current protection device;

[0006] The connecting body is connected to one end of the first test device connecting wire, and the connecting body is used to connect to the circuit breaker cabinet for the conductive performance test or the incoming and outgoing line cabinet for the insulation performance test;

[0007] The other end of the first test device connection line is connected to the test device via a clamping connection assembly;

[0008] The test device is connected to the circuit breaker cabinet via the second test device connection line, or the test device is connected to the incoming and outgoing line cabinet via the residual current protection device and the second test device connection line.

[0009] Optionally, the clamping connection assembly comprises a fork-shaped terminal;

[0010] The connecting body is an electrical contact;

[0011] The power supply side terminal in the circuit breaker cabinet is detachably connected to one end of the first test device connection line through the electrical contact;

[0012] The other end of the first test device connecting wire is connected to the test device through the fork-shaped terminal;

[0013] The test device is connected to the load-side terminal in the circuit breaker cabinet through the second test device connecting wire and the electrical contact.

[0014] Optionally, the testing device is a loop resistance tester.

[0015] Optionally, the incoming and outgoing line cabinet includes an incoming line cabinet and an outgoing line cabinet;

[0016] The connection body is an insulating connection component;

[0017] The incoming line cabinet is detachably connected to one end of the first test device connecting line through the insulating connecting assembly;

[0018] The other end of the first test device connection line is connected to the test device through the clamping connection assembly;

[0019] The test device is connected to the outlet cabinet via a residual current protection device and a second test device connecting line.

[0020] Optionally, the clamping connection assembly further comprises a clamp-type terminal;

[0021] The test device is a test transformer;

[0022] The incoming line cabinet is detachably connected to one end of the first test device connecting line through the insulating connecting assembly;

[0023] The other end of the first test device connection line is connected to the test transformer through the clamp-type terminal;

[0024] The test transformer is connected to one end of the second test device connection line through a residual current protection device;

[0025] The other end of the second test device connecting wire is connected to the outlet cabinet through the insulating connecting assembly.

[0026] Optionally, the clamping connection assembly further comprises a bolt-type terminal;

[0027] The test device is a cable oscillating wave partial discharge measuring device;

[0028] The incoming line cabinet is detachably connected to one end of the first test device connecting line through the insulating connecting assembly;

[0029] The other end of the first test device connecting wire is connected to the cable oscillation wave partial discharge measuring device through the bolt-type terminal;

[0030] The cable oscillation wave partial discharge measuring device is connected to one end of the second test device connecting line through a residual current protection device;

[0031] The other end of the second test device connecting wire is connected to the outlet cabinet through the insulating connecting assembly.

[0032] Optionally, the insulating connection assembly includes a male connector and a female connector;

[0033] The upper end surface of the male connector is provided with a threaded connecting rod, and the threaded connecting rod is threadedly connected to the lower end surface of the female connector;

[0034] The lower end surface of the male connector is provided with a connecting terminal for detachably connecting to one end of the connecting line of the testing device.

[0035] Optionally, a pressure monitoring device is provided in the male connector.

[0036] Optionally, the male connector and the female connector are both made of insulating material.

[0037] A second aspect of the present invention provides a test method for the insulation and conductivity performance test connection device of the insulating circuit breaker, comprising:

[0038] Respond to insulation and conductivity test requests;

[0039] When the insulation and conductivity test request is a conductivity test, connect the loop resistance tester to the circuit breaker cabinet and perform a loop resistance test;

[0040] When the insulation and conductivity performance test request is an insulation performance test, the test transformer is connected to the incoming and outgoing line cabinet and a cable withstand voltage test is performed, or the cable oscillation wave partial discharge measuring device is connected to the incoming and outgoing line cabinet and a cable partial discharge test is performed.

[0041] It can be seen from the above technical solutions that the present invention has the following advantages:

[0042] The present invention adopts a method of connecting a connecting body, a test device connecting wire and a residual current protection device. The connecting body is compact in design and can be reasonably placed in a limited space. The test device connecting wire has good flexibility and can flexibly bypass obstacles to connect to the test point. At the same time, the residual current protection device can accurately monitor the current, cut off abnormal circuits in time, and ensure the safety of the test. The three work together to avoid damaging the structural integrity of the equipment and effectively reduce measurement errors, ensuring that insulation and conductivity performance tests can be completed efficiently and accurately in a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 The structural diagram of the connection device for the insulation and conductivity performance test of the insulating circuit breaker;

[0045] Figure 2 is a schematic diagram of the structure of an electrical contact;

[0046] Figure 3 It is a schematic diagram of the connection between the electrical contacts, the test device connecting wires and the fork-shaped terminal blocks;

[0047] Figure 4 This is the wiring diagram for the loop resistance test;

[0048] Figure 5 It is a schematic diagram of the connection between the insulated connection assembly and the cable lug of the incoming and outgoing line cabinet;

[0049] Figure 6 It is a schematic diagram of the connection between the insulated connection assembly, the test device connection wire, the clamp-type terminal block and the test transformer;

[0050] Figure 7 It is a schematic diagram of the connection between the insulated connection assembly, the test device connection line and the residual current protection device;

[0051] Figure 8 This is the wiring diagram for the cable withstand voltage test;

[0052] Fig. 9 It is a schematic diagram of the connection between the bolt-type terminal and the cable oscillating wave partial discharge measuring device;

[0053] Fig.10 This is the wiring diagram for cable partial discharge test;

[0054] Fig.11It is a connection diagram of the incoming and outgoing line cabinet, the test device and the residual current protection device;

[0055] Fig.12 It is the monitoring and protection flow chart of the residual current protection device;

[0056] Fig.13 is a schematic diagram of a male connector;

[0057] Fig.14 is a schematic diagram of a female connector;

[0058] Fig.15 It is a schematic diagram of a male connector with a pressure sensor installed;

[0059] Fig.16 A flowchart for installing a male connector with a pressure sensor;

[0060] Fig.17 A flowchart of the steps of a test method for an insulation and conductivity performance test connection device applied to an insulation circuit breaker according to an embodiment of the present invention;

[0061] The meanings of the reference numerals are as follows:

[0062] 1. Connecting body; 101. Electrical contact; 1011. Voltage contact; 1012. Current contact; 102. Insulated connecting assembly; 1021. Male connector; 1022. Female connector; 1023. Threaded connecting rod; 1024. Connecting terminal; 1025. Pressure monitoring device; 2. Test device connecting wire; 3. Residual current protection device; 301. Protection device; 302. Monitoring device; 4. Fork-shaped terminal; 5. Loop resistance tester; 6. Clamp-type terminal; 7. Test transformer; 8. Bolt-type terminal; 9. Cable oscillation wave partial discharge measuring device. DETAILED DESCRIPTION

[0063] The embodiment of the present invention provides an insulation and conductivity performance test connection device and a test method for an insulated circuit breaker, which are used to solve the technical problem that the insulation and conductivity performance test cannot be effectively completed without destroying the structural integrity of the equipment and affecting the measurement accuracy due to the small operating space of the 10kV SF6 fully insulated circuit breaker cabinet.

[0064] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] When conducting the conductivity test, the conductive loop resistance of the 10kV SF6 fully insulated circuit breaker is measured using the loop resistance tester 5. It is necessary to first remove the cable terminal heads of the incoming and outgoing cables connected to the 10kV SF6 fully insulated circuit breaker cabinet, separate the cable terminal heads from the 10kV SF6 fully insulated circuit breaker cabinet, and then clamp the test wires of the loop resistance tester 5, i.e., the wire clamps of the two groups of voltage wires and current wires, on the outgoing bolts (originally connected to the cable terminal heads) of the fully insulated circuit breaker.

[0066] This wiring method has the following shortcomings: first, the lead-out bolts are easily deformed under the pressure of the clamp, which affects their mechanical properties; second, the lead-out bolts are relatively small in diameter, and when conducting a loop resistance test, the regulations require a DC current of no less than 100A, so the wire clamp is usually larger in size to meet the current carrying capacity, resulting in the contact surface between the wire clamp and the lead-out bolt being too small, so the contact resistance is seriously increased, and the error of the measured conductive loop resistance increases by 1000 times, and the test accuracy cannot meet the test requirements.

[0067] When conducting the insulation performance test, the AC withstand voltage test and partial discharge test of the incoming and outgoing cables of the 10kV SF6 fully insulated circuit breaker cabinet are carried out. According to the requirements of "Basic Technical Requirements for Power Cable Accessories of Rated Voltage 26 / 35kV and Below Cable Terminals" (GB11033.2-89): The cable terminal should undergo the specified series of test AC withstand voltage tests and partial discharge tests, and its various performances should meet the requirements. The incoming and outgoing cables on the 10kV SF6 fully insulated circuit breaker cabinet are rubber-plastic insulated power cables. According to the "Preventive Test Procedure for Power Equipment" (DL / T 596-2021): When the main insulation AC withstand voltage test of 35kV and below rubber-plastic insulated power cable lines is carried out, the applied test voltage is 1.7U0 and the duration is 60min. When the partial discharge test is carried out during a power outage, the following detection methods can be used: high-frequency current, oscillation splashing, ultrasonic, ultra-high frequency, etc. For the incoming and outgoing cables on the 10kV SF6 fully insulated circuit breaker cabinet, the cable oscillation wave partial discharge measurement system is currently used for testing. According to the "High Voltage Test Technology Partial Discharge Measurement" (GB / T 7354-2018), the partial discharge test voltage is the specified voltage applied according to the specified partial discharge test procedure. The "Guidelines for On-site AC Withstand Voltage Test of Cross-linked Polyethylene Insulated Power Cables" (T / CSEE 0231-2021) stipulates that the AC withstand voltage test voltage for power cables below 30kV is 2.5 times the rated phase voltage of the cable, the time is 15min, or the test voltage is 2 times the rated phase voltage of the cable, the time is 60min. Combined with the provisions of the above specifications, when conducting the AC withstand voltage test and partial discharge test of the incoming and outgoing cables of the 10kV SF6 fully insulated circuit breaker cabinet, it is necessary to apply a test voltage of 0-2U0 (U0 is the rated phase voltage of the cable, the same below) as specified, so the insulation strength requirements of the test equipment are relatively high.

[0068] Since the 10kV SF6 fully insulated circuit breaker cabinet is narrow and the test space is small, when the AC withstand voltage test and partial discharge test of the incoming and outgoing cables are conducted, when the test voltage does not rise to the rated value, the test wire clamp discharges to the semiconductor of the cable terminal head, making it impossible to continue the test. If the test personnel need to continue the AC withstand voltage test and partial discharge test of the incoming and outgoing cables, the cable terminal head needs to be removed to prevent the test wire clamp from discharging to the semiconductor of the cable terminal head under high voltage. However, this method cannot perform AC withstand voltage test and partial discharge test on the cable terminal head, and does not meet the test requirements.

[0069] It can be seen that in the prior art, the conductive loop resistance of the 10kV SF6 fully insulated circuit breaker cannot be accurately measured, and the measurement result has a large error. Because when using the loop resistance tester 5 to measure the conductive loop resistance of the 10kV SF6 fully insulated circuit breaker, it is necessary to first remove the cable terminal heads of the incoming and outgoing cables connected to the 10kV SF6 fully insulated circuit breaker cabinet, separate the cable terminal heads from the 10kV SF6 fully insulated circuit breaker cabinet, and then clamp the test wires of the loop resistance tester 5, i.e., the wire clamps of the two sets of voltage wires and current wires, on the outgoing bolts (originally connected to the cable terminal heads) of the fully insulated circuit breaker. This wiring method has the following shortcomings: first, the lead-out bolts are easily deformed under the pressure of the clamp, which affects their mechanical properties; second, the lead-out bolts are relatively small in diameter, and when conducting a loop resistance test, the regulations require a DC current of no less than 100A, so the wire clamp is usually larger in size to meet the current carrying capacity, resulting in the contact surface between the wire clamp and the lead-out bolt being too small, so the contact resistance is seriously increased, and the error of the measured conductive loop resistance increases by 1000 times, and the test accuracy cannot meet the test requirements.

[0070] In the prior art, it is impossible to perform AC withstand voltage test and partial discharge test on the incoming and outgoing cables and their cable terminals of 10kV SF6 fully insulated circuit breaker cabinets. This is because when the test voltage value is 0.7U0-1.1U0, the test wire clamp will immediately discharge the semiconductor of the cable terminal, the overcurrent protection of the test equipment will be activated, and the power supply of the test equipment will be disconnected. As a result, the test voltage cannot be increased to the specified voltage value, and the test cannot be completed.

[0071] In the existing technology, the AC withstand voltage test and partial discharge test can only be performed on the incoming and outgoing cables of the 10kV SF6 fully insulated circuit breaker cabinet when the cable terminal head is removed, but the cable terminal head cannot be tested. It is impossible to meet the requirements of the "Basic Technical Requirements for Power Cable Accessories of Rated Voltage 26 / 35kV and Below Cable Terminal Heads" (GB11033.2-89) for the series of tests of AC withstand voltage test and partial discharge test on the cable terminal head, and it is impossible to meet the requirements of regular inspection of distribution equipment according to operation regulations.

[0072] In the prior art, when the incoming or outgoing cables of a 10kV SF6 fully insulated circuit breaker cabinet are subjected to an AC withstand voltage test and a partial discharge test, when the test voltage rises to a certain value, due to the small cabinet space, it is easy for the opposite side cable to discharge to the cabinet, causing personal electric shock injury.

[0073] The purpose of the present invention is to provide an insulation and conductivity performance test connection device and a test method for an insulated circuit breaker, which are used for the loop resistance test, the withstand voltage and partial discharge test of the incoming and outgoing cables of a 10kV SF6 fully insulated circuit breaker cabinet, effectively connect the test instrument and the tested equipment, and eliminate the difficulties such as a sharp increase in the resistance value of the conductive circuit due to poor contact between the test instrument and the tested equipment, and the inability to normally increase the voltage due to insufficient insulation strength, so as to solve the problem that the prior art cannot effectively, reliably, safely and efficiently perform the conductive circuit resistance test of the 10kV SF6 fully insulated circuit breaker, the AC withstand voltage test and the partial discharge test of the incoming and outgoing cables and their terminal heads of the 10kV SF6 fully insulated circuit breaker cabinet.

[0074] See also Figure 1 , the present invention provides an insulation and conductivity performance test connection device for an insulation circuit breaker, comprising a connection body 1, a test device connection line 2 and a residual current protection device 3;

[0075] The connecting body 1 is connected to one end of the first test device connecting line 2, and the connecting body 1 is used to connect to the circuit breaker cabinet for the conductive performance test or the incoming and outgoing line cabinet for the insulation performance test;

[0076] The other end of the first test device connection line 2 is connected to the test device via a clamping connection assembly;

[0077] The test device is connected to the circuit breaker cabinet via the second test device connecting line 2 , or the test device is connected to the incoming and outgoing line cabinet via the residual current protection device 3 and the second test device connecting line 2 .

[0078] Furthermore, the connection body 1 is connected to the circuit breaker cabinet for the conductive performance test or the incoming and outgoing line cabinet for the insulation performance test through the test device connection line 2. The connection body 1 adopts a compact structural design. When conducting the conductive performance test, the compactly designed electrical contact 101 is connected to the circuit breaker cabinet. When conducting the insulation performance test, the compactly designed insulating connection assembly 102 is connected to the incoming and outgoing line cabinet. The compactly designed connection body 1 can be easily placed in a limited operating space, avoiding the problem of being unable to be installed or inconvenient to operate due to being too large.

[0079] It should be noted that the test device connecting wire 2 is made of a low-resistance, high-flexibility material in the embodiment of the present invention. Its high flexibility enables the connecting wire to be flexibly arranged in a small space, making it convenient for operators to connect the electrical contact 101 to the test instrument. Whether facing the complex wiring environment inside the circuit breaker cabinet or the inlet and outlet cabinet, or the limited operating space, the test device connecting wire 2 can easily cope with it. It does not need to destroy the structure of the circuit breaker cabinet or the inlet and outlet cabinet to create wiring space, and can ensure the accuracy of the test connection, thereby ensuring the measurement accuracy, avoiding the inconvenience of operation and measurement errors caused by the test device connecting wire 2 being too hard or too long.

[0080] It should be noted that a residual current protection device 3 is provided between the test device and the incoming and outgoing line cabinet. When conducting the insulation performance test, if the incoming and outgoing line cabinet or the test device has insulation damage or other faults, leakage may occur, resulting in abnormal residual current. The residual current protection device 3 can monitor the residual current in the circuit in real time. Once it is detected that the residual current exceeds the set threshold, it can quickly cut off the circuit in a very short time (usually tens of milliseconds) to ensure the personal safety of the test personnel and prevent the expansion of equipment damage. At the same time, the residual current generated by leakage may interfere with the measurement results of the insulation performance test, resulting in inaccurate measurement values. For example, when measuring insulation resistance, the additional current generated by leakage will make the measurement value smaller. After the residual current protection device 3 is activated, the measurement result can be closer to the actual insulation resistance value, avoiding the interference of residual current on the test data. This allows operators to effectively complete insulation and conductivity performance tests.

[0081] The present invention adopts a method of connecting a connection body 1, a test device connection line 2 and a residual current protection device 3. The connection body 1 is compact in design and can be reasonably placed in a limited space; the test device connection line 2 has good flexibility and can flexibly bypass obstacles to connect the test point. At the same time, the residual current protection device 3 can accurately monitor the current, cut off abnormal circuits in time, and ensure the safety of the test. The three work together to avoid damaging the structural integrity of the equipment and effectively reduce measurement errors, ensuring that insulation and conductivity performance tests can be completed efficiently and accurately in a small space.

[0082] See also Figure 2-Figure 4 , the present invention provides an insulation and conductivity performance test connection device for an insulating circuit breaker, the clamping connection assembly includes a fork-shaped terminal 4;

[0083] The connecting body 1 is an electrical contact 101;

[0084] The power supply side terminal in the circuit breaker cabinet is detachably connected to one end of the first test device connection line 2 via the electrical contact 101;

[0085] The other end of the first test device connecting wire 2 is connected to the test device via a fork-shaped terminal 4;

[0086] The test device is connected to the load-side terminal in the circuit breaker cabinet via the second test device connecting wire 2 and the electrical contact 101 .

[0087] The test device is a loop resistance tester 5.

[0088] It should be noted that when conducting the conductivity test, the connection body 1 used is an electrical contact 101, and the electrical contact 101 is specifically an electrical contact 101 with a voltage and current contact 1012. The electrical contact 101 with a voltage and current contact 1012 fully considers the mechanical characteristics of the outlet bolt in design, has good elasticity and adaptability, and does not need to apply excessive pressure like a traditional wire clamp to ensure the connection stability when connected to the outlet bolt. The voltage contact 1011 and the current contact 1012 can contact the outlet bolt in a relatively gentle manner, evenly disperse the contact force, and avoid the deformation of the outlet bolt caused by excessive local pressure. At the same time, during the measurement process, the voltage and current signals can be collected more accurately, reducing the voltage measurement error caused by the contact resistance, thereby improving the accuracy of the conductive loop resistance measurement.

[0089] Furthermore, when conducting a conductive performance test, in a circuit breaker cabinet with a small operating space, the connection between the electrical contact 101 and the test instrument can be successfully completed using the test device connecting wire 2, thereby solving the connection problem caused by the small operating space.

[0090] It should be noted that the test device connecting wire 2 is specifically a test device connecting wire 2 with push-in terminals at both ends, one end of which is connected to the electrical contact 101 with voltage and current contacts 1012 for connecting to the circuit breaker cabinet, and the other end is connected to the fork-shaped terminal 4 for connecting to the loop resistance tester 5.

[0091] Furthermore, the fork-shaped terminal block 4 is used in the embodiment of the present invention, specifically a terminal block with two crescent shapes (i.e., fork-shaped). The operator only needs to accurately insert the fork-shaped terminal block 4 into the corresponding connection port of the tester to complete the connection without complicated switching and debugging. This not only saves operation time, but also reduces the risk of connection errors caused by improper operation; at the same time, according to the law of resistance, the increase in contact area effectively reduces the contact resistance, and when the fork-shaped terminal block 4 with two crescent shapes is directly connected to the loop resistance tester 5, its unique fork-shaped design can achieve a large area of ​​close fit with the connection port of the tester, and the contact resistance can be reduced to close to the theoretical minimum value, which greatly reduces the measurement error caused by the contact resistance and makes the measurement result closer to the actual conductive loop resistance value.

[0092] See also Figure 5-Figure 8 , the present invention provides an insulation and conductivity performance test connection device for an insulating circuit breaker, the incoming and outgoing line cabinets include an incoming line cabinet and an outgoing line cabinet;

[0093] The connection body 1 is an insulating connection component 102;

[0094] The incoming line cabinet is detachably connected to one end of the first test device connecting line 2 via the insulating connecting assembly 102;

[0095] The other end of the first test device connection line 2 is connected to the test device via a clamping connection assembly;

[0096] The test device is connected to the outgoing line cabinet via the residual current protection device 3 and the second test device connecting line 2 .

[0097] The clamping connection assembly also includes a clamp-type terminal 6;

[0098] The test device is a test transformer 7;

[0099] The incoming line cabinet is detachably connected to one end of the first test device connecting line 2 via the insulating connecting assembly 102;

[0100] The other end of the first test device connecting wire 2 is connected to the test transformer 7 through the clamp-type terminal 6;

[0101] The test transformer 7 is connected to one end of the second test device connection line 2 through the residual current protection device 3;

[0102] The other end of the second test device connecting line 2 is connected to the outlet cabinet through the insulating connecting assembly 102 .

[0103] It should be noted that the insulation performance test includes a cable withstand voltage test and a cable partial discharge test. When conducting the cable withstand voltage test, the connection body 1 used is an insulating connection component 102, and the clamping connection component uses a clamp-type terminal 6, specifically an crocodile head clamp-type terminal 6.

[0104] In the embodiment of the present invention, the incoming line cabinet is detachably connected to one end of the first test device connection line 2 through the insulating connection component 102. The insulating connection component 102 is made of a material with high insulation performance, such as insulating plastic or rubber, which can effectively isolate the test voltage, prevent current leakage and breakdown, and ensure that when the incoming line cabinet is connected to the test device connection line 2, even if the test voltage is high, there will be no safety hazards such as leakage. At the same time, the design of the detachable connection facilitates the installation and disassembly of the equipment before and after the test, which improves the convenience of the test operation.

[0105] The other end of the first test device connection line 2 is connected to the test transformer 7 through a clamp-type terminal 6, specifically an alligator head clamp-type terminal 6. The surface of the alligator head clamp-type terminal 6 has been specially insulated to prevent leakage when connecting the cable and the test circuit. The unique alligator head shape design can tightly clamp the connection between the test device connection line 2 and the test transformer 7 like the sharp teeth of an alligator tightly biting its prey, ensuring good electrical contact. Even during a long test process, a stable connection state can be maintained to ensure that the test voltage can be applied normally and the test results will not be affected by insulation problems at the contact part.

[0106] As the core device for providing the test voltage in the entire test system, the test transformer 7 has good insulation performance and stability. The test transformer 7 is connected to one end of the second test device connection line 2 through the residual current protection device 3. The residual current protection device 3 plays a vital role in safety protection, and it can monitor the residual current in the circuit in real time. During the test, if the insulation damage or other faults occur in the incoming and outgoing line cabinets or the test device, resulting in abnormal residual current, the residual current protection device 3 can quickly cut off the circuit in a very short time to avoid electric shock to personnel and prevent further damage to the equipment. At the same time, it can also prevent leakage from interfering with the test results.

[0107] The other end of the second test device connection line 2 is connected to the outlet cabinet through the insulating connection component 102. Similarly, the insulating connection component 102 here can effectively isolate the test voltage, ensure that the test voltage and current are transmitted along the predetermined path, prevent current leakage and external interference, and ensure a safe connection between the outlet cabinet and the entire test system.

[0108] In the entire connection structure, the insulating connection assembly 102, the test device connection line 2, the crocodile head clamp type terminal block 6, the test transformer 7, and the residual current protection device 3 match and work together to ensure that the AC withstand voltage test of the incoming and outgoing cables of the 10kV SF6 fully insulated circuit breaker cabinet can be carried out safely, accurately and smoothly under the premise of meeting the requirements of the specifications.

[0109] See also Figure 5 , Figure 7 , Fig. 9 and Fig.10 , the present invention provides an insulation and conductivity performance test connection device for an insulating circuit breaker, the clamping connection assembly also includes a bolt-type terminal 8;

[0110] The test device is a cable oscillating wave partial discharge measuring device 9;

[0111] The incoming line cabinet is detachably connected to one end of the first test device connecting line 2 via the insulating connecting assembly 102;

[0112] The other end of the first test device connecting line 2 is connected to the cable oscillation wave partial discharge measuring device 9 through the bolt-type terminal 8;

[0113] The cable oscillation wave partial discharge measuring device 9 is connected to one end of the second test device connecting line 2 through the residual current protection device 3;

[0114] The other end of the second test device connecting line 2 is connected to the outlet cabinet through the insulating connecting assembly 102 .

[0115] In the embodiment of the present invention, the incoming line cabinet is detachably connected to one end of the first test device connection line 2 through the insulating connection component 102. The insulating connection component 102 is made of a material with high insulation performance, such as high-performance insulating rubber or a special insulating plastic, and has extremely high insulation resistance and good voltage resistance, which can effectively prevent current leakage. Even in a high-voltage test environment, it can ensure electrical isolation between the incoming line cabinet and the test device connection line 2 to avoid safety accidents such as short circuits or leakage. The design of detachable connection facilitates equipment installation before the test and equipment disassembly and maintenance after the test, thereby improving work efficiency.

[0116] The other end of the first test device connecting wire 2 is connected to the cable oscillation wave partial discharge measuring device 9 through a bolt-type terminal 8. The bolt-type terminal 8 has the advantages of firm connection and low contact resistance. During the installation process, by tightening the bolts, the terminal can be tightly connected to the connecting wire and the measuring device to ensure good electrical conductivity. At the same time, the terminal itself has also undergone special insulation treatment, and its surface is covered with a layer of insulating coating, which can effectively prevent current leakage and further improve the insulation performance of the connection part. This reliable connection method ensures that the test voltage can be accurately transmitted from the incoming cabinet to the cable oscillation wave partial discharge measuring device 9, providing a basis for the accurate conduct of the test.

[0117] The cable oscillation wave partial discharge measuring device 9 is connected to one end of the second test device connecting line 2 through the residual current protection device 3. The residual current protection device 3 is one of the key devices to ensure the safety of the test. It can monitor the residual current in the circuit in real time. Once it detects an abnormal increase in residual current caused by insulation damage and other reasons, it will quickly cut off the circuit to prevent electric shock to personnel and damage to equipment. During the test, even if an unexpected situation occurs, the residual current protection device 3 can react in a very short time to protect the safety of the entire test system.

[0118] The other end of the second test device connection line 2 is connected to the outgoing cabinet through the insulating connection component 102. Like the insulating connection component 102 of the incoming cabinet connection part, the insulating connection component 102 here also has excellent insulation performance, which can ensure that the test voltage and current are transmitted from the cable oscillation wave partial discharge measurement device 9 to the outgoing cabinet according to the predetermined path, avoiding the impact of current leakage on the surrounding environment and other equipment. At the same time, it can also withstand the high voltage during the test to ensure the stability and reliability of the connection.

[0119] Through the cooperation of the insulating connection assembly 102, the bolt-type terminal 8, the cable oscillating wave partial discharge measuring device 9 and the residual current protection device 3, a complete and reliable test system is formed. In this system, each component plays an important role, and together ensures that the test equipment has sufficient insulation strength when applying the 0-2U0 test voltage. The insulation design of the insulating connection assembly 102 and the bolt-type terminal 8 effectively isolates the high voltage and prevents current leakage; the cable oscillating wave partial discharge measuring device 9 can accurately perform test measurements; and the residual current protection device 3 provides safety protection for the test process. This connection method not only meets the requirements of the relevant specifications for the application of test voltage, but also ensures the safety of the test process and the accuracy of the test results, providing a reliable solution for the partial discharge test of the incoming and outgoing cables of the 10kV SF6 fully insulated circuit breaker cabinet.

[0120] It is worth mentioning that the end of the test device connecting wire 2 connected to the test device adopts a detachable terminal (such as a fork-shaped terminal 4, a clamp-type terminal 6 and a bolt-type terminal 8), which can ensure that the test device is firmly connected. At the same time, the end of the test device connecting wire 2 and the circuit breaker cabinet or the incoming and outgoing line cabinet adopts a plug-in connection structure (such as an electrical contact 101 and an insulating connection assembly 102), which can avoid the phenomenon of the tested equipment discharging to other parts, instruments, and air.

[0121] Specifically, see Figure 11-Figure 12 When conducting the insulation performance test, the test device is connected to the incoming and outgoing line cabinet through the residual current protection device 3 and the second test device connecting wire 2. When the AC withstand voltage test and partial discharge test are performed on the incoming and outgoing cables and their terminal heads of the 10kV SF6 fully insulated circuit breaker cabinet, the threaded connecting rod 1023 on the male connector 1021 passes through the wire ear of the cable head, and then the female connector 1022 is connected to the male connector 1021. Figure 5 As shown, the test device connecting wire 2 is then inserted into the male connector 1021, and then the test device connecting wire 2 is connected to the residual current protection device 3, so that the opposite side cable head is insulated and protected to prevent the opposite side cable head from discharging to the cabinet when the test voltage is increased, causing the overcurrent protection of the test device to be activated.

[0122] In addition, by connecting the residual current protection device 3 to the male connector 1021, it is possible to monitor in real time whether the connected incoming and outgoing line cabinet casing is energized during the test. If it is monitored that the residual current of the connected incoming and outgoing line cabinet casing exceeds the threshold, although at this time it has not reached the overcurrent protection action value of the connected incoming and outgoing line cabinet, it has exceeded the allowable value of "Effects of Electric Current on Humans and Livestock Part 1 General Part" (GB / T 13870.1-2022), so the residual current protection device 3 is activated and the power supply is cut off to ensure the personal safety of the test personnel and prevent surrounding personnel from accidentally touching the connected incoming and outgoing line cabinet casing and causing electric shock injuries.

[0123] It should be noted that the residual current protection device 3 includes a monitoring device 302 and a protection device 301. The monitoring device 302 and the protection device 301 transmit data by wireless signals, so they are not affected by the geographical location of the site, and the protection is reliable and safe. The monitoring device 302 and the protection device 301 transmit data by wireless. Since the length of the test cable is sometimes over one kilometer, the incoming cabinet and the outgoing cabinet are more than one kilometer apart. When the outgoing cabinet detects a residual current exceeding the allowable value, the protection device 301 will disconnect the power supply connected to the incoming cabinet like a circuit breaker, so that the entire circuit is powered off.

[0124] It is worth mentioning that the residual current protection device 3 ensures personal safety during the test.

[0125] See also Fig.13 and Fig.14 , the present invention provides an insulation and conductivity performance test connection device for an insulation circuit breaker, the insulation connection assembly 102 includes a male connector 1021 and a female connector 1022;

[0126] The upper end surface of the male connector 1021 is provided with a threaded connecting rod 1023, and the threaded connecting rod 1023 is threadedly connected to the lower end surface of the female connector 1022;

[0127] The lower end surface of the male connector 1021 is provided with a connecting terminal 1024 for detachably connecting to one end of the test device connecting line 2 .

[0128] The male connector 1021 and the female connector 1022 are both made of insulating material.

[0129] It should be noted that the male connector 1021 and the female connector 1022 are made of materials with high insulation properties, such as high-performance insulating rubber or special insulating plastics, which have extremely high insulation resistance and good voltage resistance, and can effectively prevent current leakage. The lower end face of the male connector 1021 is provided with a connecting terminal 1024 for detachable connection to one end of the test device connecting line 2, and the female connector 1022 does not need to be connected to the test device, so it does not have the test device connecting terminal 1024, saving costs.

[0130] Furthermore, the threaded connecting rod 1023 can be made of copper material. When the copper threaded connecting rod 1023 is threadedly connected with the female connector 1022, it can form a stable electrical contact. For applications with extremely high electrical performance requirements such as the incoming and outgoing cable tests of 10kV SF6 fully insulated circuit breaker cabinets, the copper threaded connecting rod 1023 can ensure the stable and accurate transmission of voltage and current during the test, avoiding voltage drop and signal distortion caused by excessive resistance, thereby ensuring the accuracy and reliability of the test results.

[0131] See also Fig.15 and Fig.16 The present invention provides an insulation and conductivity performance test connection device for an insulating circuit breaker, wherein a pressure monitoring device 1025 is provided in a male connector 1021 .

[0132] It should be noted that the pressure monitoring device 1025 uses a pressure sensor to collect torque data, which is used to collect torque data at the connection between the insulating connection assembly 102 and the incoming and outgoing line cabinet. The pressure sensor is a cylindrical pressure sensor, which is coaxially arranged with the threaded connecting rod 1023. The pressure sensor can sense the pressure evenly along the axial direction of the threaded connecting rod 1023. When the male connector 1021 and the female connector 1022 are connected by the threaded connecting rod 1023, the pressure generated will be transmitted along the axial direction. Since the two are coaxial, the pressure sensor can directly and evenly receive these pressure signals, avoiding measurement errors caused by uneven force. At the same time, the coaxial setting allows the pressure sensor to mainly bear axial pressure, which can effectively eliminate the interference of lateral forces and improve the accuracy and stability of the measurement.

[0133] Furthermore, the torque data specifically refers to the torque of the outlet bolts of the incoming and outgoing line cabinet (originally connected to the cable terminal head) and the cable head wire ear. Since the cable head and the incoming and outgoing line cabinet terminals have strict requirements on the installation torque, the insulating connection component 102 is equipped with a pressure monitoring device 1025 to monitor the wiring installation torque in real time to prevent deformation or other irreversible mechanical damage caused by uneven force on the connection points of the tested equipment when the insulating connection component 102 is used to mechanically connect the tested equipment.

[0134] See also Fig.16The pressure monitoring device 1025 uses a pressure sensor to collect torque data. The pressure sensor is arranged under the insulation layer of the male connector 1021, so it does not affect the overall insulation performance of the insulating connection component 102. The data receiving device is used on site to receive the torque data collected by the pressure sensor. After the data processor processes the data, the data is displayed on the display terminal for the test personnel to monitor the data. When the torque exceeds the threshold, a warning will be issued to remind the operator that the operating force and angle are incorrect and the operation should be stopped to prevent deformation of the tested equipment.

[0135] It is worth mentioning that the insulating connection assembly 102, which is composed of a threaded connecting rod 1023 made of copper, a male connector 1021 and a female connector 1022 made of insulating material, and a built-in pressure monitoring device 1025 under the insulating layer, can withstand high test voltage while ensuring that the lead-out bolts are not deformed.

[0136] It should be noted that before testing the connection between the insulating connection assembly 102 and the incoming and outgoing line cabinet, the cable head should be removed and then the connection can be made.

[0137] See also Fig.17 The present invention provides a test method for an insulation and conductivity performance test connection device for an insulation circuit breaker, comprising:

[0138] Step 101: respond to an insulation and conductivity performance test request.

[0139] In the embodiment of the present invention, the insulation and conductivity test request refers to a request instruction for performing a loop resistance test, a cable withstand voltage test and a cable partial discharge test, in response to a received insulation and conductivity test request.

[0140] Step 102: When the insulation and conductivity test request is a conductivity test, the loop resistance tester 5 is connected to the circuit breaker cabinet and a loop resistance test is performed.

[0141] In the embodiment of the present invention, please refer to Figure 4 , the specific process of loop resistance test is as follows:

[0142] 1. Connect the electrical contact 101 to the terminal on the A-phase power supply side of the switch ( Figure 4 In the left side cabinet), electrical contact 101 connects the load side terminal of phase A of the switch ( Figure 4 The wiring is secure.

[0143] 2. Turn on the loop resistance tester 5 correctly, select the correct current range (100A), select the default test time or 10S, and click to start the test; after the test is completed, save the data, and record or print the test data on paper.

[0144] 3. Repeat the above two steps to test the loop resistance of phases B and C. After all tests are completed, turn off the instrument and remove the connecting wires.

[0145] Step 103, when the insulation and conductivity performance test request is an insulation performance test, the test transformer 7 is connected to the incoming and outgoing line cabinet and a cable withstand voltage test is performed, or the cable oscillation wave partial discharge measurement device 9 is connected to the incoming and outgoing line cabinet and a cable partial discharge test is performed.

[0146] In the embodiment of the present invention, please refer to Figure 8 , the specific process of cable withstand voltage test is as follows:

[0147] 1. Check the phase of the cable to ensure that the phase at both ends of the cable is consistent with the phase of the power grid.

[0148] Use a megohmmeter to measure the insulation resistance of each core wire and sheath of the multi-core cable to confirm that the cable insulation performance is good.

[0149] 2. Connect all components and the tested cables. Figure 8 as shown, and ensure that the ground wire is correct.

[0150] 3. Operate the series resonance device to raise the voltage to a predetermined value (e.g. 52 kV), and then start the withstand voltage test. Observe the current and voltage changes during the cable test and record the relevant data.

[0151] 4. After the voltage test is completed, cut off the power supply and measure the insulation resistance of the cable again.

[0152] In the embodiment of the present invention, please refer to Fig.10 , the specific process of cable partial discharge test is as follows:

[0153] 1. Check the cable oscillation wave partial discharge measuring device 9 to ensure that it is intact and connected normally. Calibrate according to the standard to ensure accurate and reliable measurement. Check whether there are defects in the cable sheath, terminals and intermediate joints. Use a megohmmeter to measure the insulation resistance to ensure that it meets the standards. If it is too low, further inspection is required. Perform a phase check to ensure that the phases at both ends are consistent with the power grid.

[0154] 2. Connect all components and the tested cables. Fig.10 as shown, and ensure that the ground wire is correct.

[0155] 3. Determine the test voltage according to the rated voltage, insulation type and standard requirements of the cable. For example, the test voltage for 10kV cross-linked polyethylene insulated cable is generally about 2 times the rated phase voltage. The test duration is specified, usually 15 - 60 minutes, depending on the cable type and standard.

[0156] 4. Start the equipment according to the operating instructions, increase the voltage slowly, observe the operation closely, stop increasing the voltage in case of abnormality and find the cause, start the test after the voltage reaches the preset value, monitor the partial discharge with the measurement system, record the starting voltage, extinction voltage, discharge amount and other data, and continuously monitor the test voltage and discharge amount.

[0157] 5. After the test, slowly reduce the voltage to zero, turn off the equipment, avoid voltage mutations, process, analyze and record the data, and judge whether the cable partial discharge performance is qualified according to the standard. If it is unqualified, further inspection is required.

[0158] The present invention has the following advantages:

[0159] 1. Solve the voltage resistance problem. The insulating connection assembly 102 composed of the copper threaded connecting rod 1023 and the male connector 1021 and the female connector 1022 of insulating material has good electrical conductivity and can withstand high test voltage.

[0160] 2. Cost saving: The male connector 1021 has a connection terminal 1024 of a test instrument, while the female connector 1022 does not need to be connected to a test instrument and therefore does not have a connection terminal 1024 of a test instrument.

[0161] 3. Ensure personal safety. The residual current protection device 3 can monitor in real time whether the shell of the incoming and outgoing cabinet is energized during the test. If the residual current of the shell of the incoming and outgoing cabinet is detected to exceed the threshold, it will act reliably to ensure the personal safety of the test personnel.

[0162] 4. Ensure equipment safety and solve the problem in the prior art that the lead-out bolts are easily deformed under the pressure of the clamp. The device is equipped with a pressure monitoring device 1025 to monitor the wiring installation torque in real time to prevent deformation or other irreversible mechanical damage caused by uneven force on the connection point of the tested device when the tested device is mechanically connected using the connection device.

[0163] 5. Fast and reliable. The plug-in insulating connection assembly 102 is designed to solve the problem of the prior art that the wire clamp used to connect the tested device is not firmly connected and the connection is not tight, which causes the wire clamp position and angle to be constantly adjusted during the test, thus wasting a lot of time. At the same time, the insulating connection assembly 102 is made of full insulating material, and there is no air gap between the device and the tested device, which eliminates the phenomenon of the tested device discharging to other parts, instruments, and air during the test, thereby improving the safety of the test.

[0164] In summary, the testing method of the present invention has more advantages than the current prior art, and can complete the 10kV SF6 fully insulated circuit breaker cabinet loop resistance test, incoming and outgoing cable withstand voltage and partial discharge test more quickly, accurately and reliably.

[0165] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0166] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0167] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An insulation and conductivity performance test connection device for an insulating circuit breaker, characterized in that: It includes a connection body, a test device connection line and a residual current protection device; The connecting body is connected to one end of the first test device connecting wire, and the connecting body is used to connect to the circuit breaker cabinet for the conductive performance test or the incoming and outgoing line cabinet for the insulation performance test; The other end of the first test device connection line is connected to the test device via a clamping connection assembly; The test device is connected to the circuit breaker cabinet via the second test device connecting wire, or the test device is connected to the incoming and outgoing line cabinet via the residual current protection device and the second test device connecting wire.

2. The insulation and conductivity performance test connection device of the insulating circuit breaker according to claim 1, characterized in that: The clamping connection assembly includes a fork-shaped terminal; The connecting body is an electrical contact; The power supply side terminal in the circuit breaker cabinet is detachably connected to one end of the first test device connection line through the electrical contact; The other end of the first test device connecting wire is connected to the test device through the fork-shaped terminal; The test device is connected to the load-side terminal in the circuit breaker cabinet through the second test device connecting wire and the electrical contact.

3. The insulation and conductivity performance test connection device of the insulating circuit breaker according to claim 2, characterized in that: The testing device is a loop resistance tester.

4. The insulation and conductivity performance test connection device of the insulating circuit breaker according to claim 1, characterized in that: The incoming and outgoing line cabinets include an incoming line cabinet and an outgoing line cabinet; The connection body is an insulating connection component; The incoming line cabinet is detachably connected to one end of the first test device connecting line through the insulating connecting assembly; The other end of the first test device connection line is connected to the test device through the clamping connection assembly; The test device is connected to the outlet cabinet via a residual current protection device and a second test device connecting line.

5. The insulation and conductivity performance test connection device for an insulating circuit breaker according to claim 4, characterized in that: The clamping connection assembly also includes a clamp-type terminal; The test device is a test transformer; The incoming line cabinet is detachably connected to one end of the first test device connecting line through the insulating connecting assembly; The other end of the first test device connection line is connected to the test transformer through the clamp-type terminal; The test transformer is connected to one end of the second test device connection line through a residual current protection device; The other end of the second test device connecting wire is connected to the outlet cabinet through the insulating connecting assembly.

6. The insulation and conductivity performance test connection device for an insulating circuit breaker according to claim 4, characterized in that: The clamping connection assembly also includes a bolt-type terminal; The test device is a cable oscillating wave partial discharge measuring device; The incoming line cabinet is detachably connected to one end of the first test device connecting line through the insulating connecting assembly; The other end of the first test device connecting wire is connected to the cable oscillation wave partial discharge measuring device through the bolt-type terminal; The cable oscillation wave partial discharge measuring device is connected to one end of the second test device connecting line through a residual current protection device; The other end of the second test device connecting wire is connected to the outlet cabinet through the insulating connecting assembly.

7. The insulation and conductivity performance test connection device of the insulating circuit breaker according to any one of claims 4 to 6, characterized in that: The insulating connection assembly includes a male connector and a female connector; The upper end surface of the male connector is provided with a threaded connecting rod, and the threaded connecting rod is threadedly connected to the lower end surface of the female connector; The lower end surface of the male connector is provided with a connecting terminal for detachably connecting to one end of the connecting line of the testing device.

8. The insulation and conductivity performance test connection device for an insulating circuit breaker according to claim 7, characterized in that: A pressure monitoring device is arranged in the male connector.

9. The insulation and conductivity performance test connection device for an insulating circuit breaker according to claim 7, characterized in that: The male connector and the female connector are both made of insulating material.

10. A test method for the insulation and conductivity performance test connection device of the insulating circuit breaker according to any one of claims 1 to 9, characterized in that: include: Respond to insulation and conductivity test requests; When the insulation and conductivity test request is a conductivity test, connect the loop resistance tester to the circuit breaker cabinet and perform a loop resistance test; When the insulation and conductivity performance test request is an insulation performance test, the test transformer is connected to the incoming and outgoing line cabinet and a cable withstand voltage test is performed, or the cable oscillation wave partial discharge measuring device is connected to the incoming and outgoing line cabinet and a cable partial discharge test is performed.

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