Insulation test system for high-voltage switchgear

Abstract

The invention discloses an insulation test system for high-voltage switch equipment. The insulation test system comprises a power frequency voltage test module, a lightning impulse voltage test module, a direct-current voltage test module, a test wiring change-over switch and a test measurement and control system, the power frequency voltage test module is used for providing power frequency test voltage for the switch equipment sample; the lightning impulse voltage test module is used for providing lightning impulse test voltage for the switch equipment sample; the direct-current voltage test module is used for providing high-voltage direct-current test voltage for the switch equipment sample; the test wiring change-over switch comprises a plurality of switch devices, and each switch device comprises a plurality of opening and closing combination states. And the measurement and control system is used for controlling one or a combination of two of the power frequency test voltage, the lightning impulse test voltage and the high-voltage direct-current test voltage to be input to the switch equipment sample through the test wiring change-over switch so as to test the insulativity of the switch equipment sample.

Description

Technical Field

[0001] The present invention relates to the technical field of high voltage testing of high voltage switches, and more specifically, to an insulation testing system for high voltage switchgear. Background Art

[0002] Distribution network switchgear such as high-voltage switchgear, pole-mounted circuit breakers, ring network boxes, and high-voltage disconnectors are electrical equipment that open and close, control, and protect electrical equipment in the distribution network. At present, the test method for power frequency withstand voltage test of distribution network switchgear is based on GB / T 11022, and the test equipment uses a power frequency voltage test system composed of a voltage regulator, a test transformer, a voltage divider, and a measurement and control system; the test method for lightning impulse voltage test of distribution network switchgear is based on GB / T 11022, and the test equipment uses a lightning impulse voltage generator, using the principle of parallel charging and series discharge of capacitors. Since distribution network switchgear usually has three phases, and has multiple test locations between phases, relative to ground, and breaks, the lightning impulse test is divided into positive polarity test and negative polarity test. The test procedure for one test location usually needs to be performed 15 times. Therefore, the insulation test of distribution network switchgear requires the use of multiple sets of test equipment, and the equipment must be powered off, grounded, and the test wiring replaced for many times. The test time is long, which increases the safety risk of personnel operations.

[0003] Table 1 is the pressure-applying method table for the power frequency voltage test of the pole-mounted circuit breaker. It is necessary to change the wiring method for pressure-applying 9 times in total. Table 2 is the pressure-applying method table for the lightning impulse voltage test of the pole-mounted circuit breaker. It is necessary to change the wiring method for 9 times in total and change the test voltage polarity for 2 times. One test procedure is usually carried out 15 times. It is conservatively estimated that the pole-mounted circuit breaker needs to undergo 270 lightning impulse tests.

[0004] Table 1: Power frequency voltage test pressure method table for pole-mounted circuit breakers

[0005]

[0006]

[0007] Table 2 Pressure-applying method for lightning impulse voltage test of pole-mounted circuit breaker

[0008]

[0009] The first prior art is to use a power frequency voltage test system to complete the power frequency voltage test when conducting insulation tests on high-voltage switchgear, and use a lightning impulse voltage generator to complete the lightning impulse voltage test. Switching between the power frequency voltage test and the lightning impulse voltage test requires changing the test wiring, and even moving the sample to the corresponding test station. However, the first prior art requires two people to operate the switch between the power frequency voltage test and the lightning impulse voltage test. Manually changing the test wiring is slow and inefficient, and there are safety risks.

[0010] The second prior art is that when conducting insulation tests on high-voltage switchgear, there are usually 9 test pressurization methods for three-phase switchgear, and manual replacement of test wiring is required. There are 9 power frequency voltage test pressurization methods for pole-mounted circuit breakers, and there may be 15 or 18 power frequency voltage test pressurization methods for ring network cabinets; there are 9 lightning impulse voltage test pressurization methods for pole-mounted circuit breakers, and it is also necessary to switch the two voltage polarities, and there may be 15 or 18 power frequency voltage test pressurization methods for ring network cabinets, and it is also necessary to switch the two voltage polarities. However, the second prior art requires two people to operate the switching test method in the power frequency voltage test or the lightning impulse voltage test, and manual change of the test wiring is slow and inefficient, and there are safety risks. Summary of the invention

[0011] The technical solution of the present invention provides a high-voltage switchgear insulation test system to solve the problem of how to perform automated insulation tests on high-voltage switchgear.

[0012] In order to solve the above problems, the present invention provides a high-voltage switchgear insulation test system, the system comprising: a power frequency voltage test module, a lightning impulse voltage test module, a DC voltage test module, a test wiring switch and a test measurement and control system;

[0013] The power frequency voltage test module is used to provide a power frequency test voltage to the switchgear sample;

[0014] The lightning impulse voltage test module is used to provide a lightning impulse test voltage to the switchgear sample;

[0015] The DC voltage test module is used to provide a high-voltage DC test voltage to the switchgear sample;

[0016] The test wiring switch includes a plurality of switch devices, and the switch devices include a plurality of opening and closing combination states;

[0017] The measurement and control system is used to control the input of one of the power frequency test voltage, the lightning impulse test voltage, the high voltage DC test voltage, or a combination of two thereof into the switchgear sample via the test wiring switching switch to test the insulation of the switchgear sample.

[0018] Preferably, the test mode of the measurement and control system includes a manual test mode and an automatic test mode;

[0019] When the test mode is the manual test mode, the test wiring switch is set to the manual switch test mode;

[0020] When the test mode is the automatic test mode, the test wiring switching switch is set to the automatic switch test mode.

[0021] Preferably, the test wiring switch includes a plurality of primary switches, a plurality of secondary switch combinations and a grounding switch combination; the number of the primary switches is consistent with the number of the secondary switch combinations; the secondary switch combination includes a plurality of switch devices;

[0022] Respectively connect the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, the lightning impulse voltage test module and the DC voltage test module; respectively connect the second end of each of the plurality of primary switches to the first end of each switch device in the corresponding secondary switch combination;

[0023] Two ends of the A phase, the B phase and the C phase of the switch device sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination;

[0024] The second end of each switch device in the grounding switch assembly is connected to the grounding line.

[0025] Preferably, it also includes:

[0026] The test wiring switch includes a plurality of primary switches, a secondary switch combination and a grounding switch combination; the number of the primary switches is greater than the number of the secondary switch combination; the secondary switch combination includes a plurality of switch devices;

[0027] Respectively connecting the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, the lightning impulse voltage test module and the DC voltage test module;

[0028] The second end of one or two of the plurality of primary switches is connected to the first end of each switch device in the secondary switch combination;

[0029] Two ends of the A phase, the B phase and the C phase of the switch device sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination;

[0030] The second end of each switch device in the grounding switch assembly is connected to the grounding line.

[0031] Preferably, it also includes an auxiliary power frequency voltage test module;

[0032] The test wiring switch includes a plurality of primary switches, a plurality of secondary switch combinations and a grounding switch combination; the number of the primary switches is consistent with the number of the secondary switch combinations; the secondary switch combination includes a plurality of switch devices;

[0033] Respectively connect the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, the lightning impulse voltage test module, the DC voltage test module and the auxiliary power frequency voltage test module; the second end of each of the plurality of primary switches is respectively connected to the first end of each switch device in the corresponding secondary switch combination;

[0034] Two ends of the A phase, the B phase and the C phase of the switch device sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination;

[0035] The second end of each switch device in the grounding switch assembly is connected to the grounding line.

[0036] Preferably, it also includes an auxiliary power frequency voltage test module;

[0037] The test wiring switch includes a plurality of primary switches, a secondary switch combination and a grounding switch combination; the number of the primary switches is greater than the number of the secondary switch combination; the secondary switch combination includes a plurality of switch devices;

[0038] Respectively connect the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, the lightning impulse voltage test module, the DC voltage test module and the auxiliary power frequency voltage test module;

[0039] The second end of one or two of the plurality of primary switches is connected to the first end of each switch device in the secondary switch combination;

[0040] Two ends of the A phase, the B phase and the C phase of the switch device sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination;

[0041] The second end of each switch device in the grounding switch assembly is connected to the grounding line.

[0042] Preferably, it also includes: setting the opening and closing states of the switch devices in the primary switch, the secondary switch combination and the grounding switch combination.

[0043] Preferably, the power frequency voltage test module provides the power frequency test voltage through a voltage regulator or a power electronic power supply plus a step-up transformer.

[0044] Preferably, the lightning impulse voltage test module provides a lightning impulse test voltage based on parallel charging and series discharging of capacitors.

[0045] Preferably, the connection mode between the measurement and control system and the power frequency voltage test module, the lightning impulse voltage test module and the DC voltage test module includes: communication cable connection and control cable connection.

[0046] Preferably, the switch device includes a high-voltage disconnector, a high-voltage circuit breaker, a high-voltage contactor and a vacuum switch.

[0047] Preferably, the switch device is enclosed in a gas box filled with sulfur hexafluoride gas.

[0048] The technical solution of the present invention provides a high-voltage switchgear insulation test system, the system includes: a power frequency voltage test module, a lightning impulse voltage test module, a DC voltage test module, a test wiring switch and a test measurement and control system; the power frequency voltage test module is used to provide a power frequency test voltage to the switchgear sample; the lightning impulse voltage test module is used to provide a lightning impulse test voltage to the switchgear sample; the DC voltage test module is used to provide a high-voltage DC test voltage to the switchgear sample; the test wiring switch includes a plurality of switch devices, and the switch devices include a plurality of opening and closing combination states; the measurement and control system is used to control the input of one of the power frequency test voltage, the lightning impulse test voltage, and the high-voltage DC test voltage, or a combination of two thereof, to the switchgear sample via the test wiring switch to test the insulation of the switchgear sample. The technical solution of the present invention provides a high-voltage switchgear insulation test system, which improves the automation level of the high-voltage switchgear insulation test and solves the problem that a large amount of manual operation is required to switch between different test pressurization methods when the high-voltage switchgear is subjected to insulation testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0050] Figure 1 A structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention;

[0051] Figure 2 A structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention;

[0052] Figure 3 A structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention;

[0053] Figure 4 A structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention; and

[0054] Figure 5The figure is a structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0055] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0056] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0057] Figure 1 The figure is a structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention.

[0058] The present invention solves the problem that when high-voltage switchgear needs to undergo both power frequency voltage test and lightning impulse voltage test, samples need to be manually moved to different test stations, and testers need to change test wiring during the test. It also solves the problem that switching between different test pressurization modes when the high-voltage switchgear undergoes insulation test requires a large amount of manual operation.

[0059] The purpose of the present invention is to provide a high-voltage switchgear insulation test system to improve the automation level of the high-voltage switchgear insulation test.

[0060] The present invention provides a high-voltage switchgear insulation test system, the system comprising: a power frequency voltage test module, a lightning impulse voltage test module, a DC voltage test module, a test wiring switching switch, and a test measurement and control system;

[0061] The power frequency voltage test module is used to provide power frequency test voltage to the switchgear samples;

[0062] The lightning impulse voltage test module is used to provide lightning impulse test voltage to the switchgear samples;

[0063] The DC voltage test module is used to provide high-voltage DC test voltage to the switchgear samples;

[0064] The test wiring transfer switch includes a plurality of switch devices, and the switch devices include a plurality of opening and closing combination states;

[0065] The measurement and control system is used to control the input of one of the power frequency test voltage, lightning impulse test voltage, high voltage DC test voltage, or a combination of two of them into the switchgear sample via the test wiring switching switch to test the insulation of the switchgear sample.

[0066] Preferably, the test mode of the measurement and control system includes a manual test mode and an automatic test mode;

[0067] When the test mode is manual test mode, the test wiring switch is set to manual switch test mode;

[0068] When the test mode is automatic test mode, the test wiring switch is set to automatic switch test mode.

[0069] The invention provides a high-voltage switchgear insulation test system, comprising a power frequency voltage test module, a lightning impulse voltage test module, a DC voltage test module, a test wiring switching switch, and a test measurement and control system.

[0070] The present invention provides a high-voltage switchgear insulation test system, wherein the power frequency voltage test module is used to provide the power frequency test voltage. The power frequency voltage test module, the lightning impulse voltage test module and the DC voltage test module can be independently dispersed and arranged nearby, or can be integrated on a base. The power frequency voltage test module can adopt the technical solution of a voltage regulator or a power electronic power supply plus a step-up transformer.

[0071] The invention provides a high-voltage switchgear insulation test system, wherein the lightning impulse voltage test module is used to provide a lightning impulse test voltage. The lightning impulse voltage test module can adopt the principle of parallel charging and series discharging of capacitors, or can adopt a solid-state electronic circuit to generate a lightning high voltage.

[0072] The present invention provides a high-voltage switchgear insulation test system, wherein a DC voltage test module is used to provide a high-voltage DC test voltage. When the DC voltage test module and the power frequency voltage test module are used together, a combined voltage test system of power frequency superimposed DC is formed. When the DC voltage test module and the lightning impulse voltage test module are used together, a combined voltage test system of lightning superimposed DC is formed.

[0073] The present invention provides a high-voltage switchgear insulation test system, wherein the test wiring switch is used to change the test wiring mode during the test. The test wiring switch is composed of a plurality of switch devices, and a high-voltage isolating switch, a high-voltage circuit breaker, a high-voltage contactor, a vacuum switch, etc. can be used. Alternatively, a plurality of switch devices can be encapsulated in a gas box filled with sulfur hexafluoride gas, and the internal wiring of the gas box is led out through a high-voltage bushing.

[0074] The present invention provides a high-voltage switchgear insulation test system. The test measurement and control system is used to measure test parameters, record data waveforms, generate test reports and records, and control the test process.

[0075] The present invention provides a high-voltage switchgear insulation test system, and the test control can be set to automatic and manual. When set to manual test, the test measurement and control system adjusts the test wiring switch to a mode suitable for manual test. When set to manual test, the power frequency voltage test module, the lightning impulse voltage test module, and the DC voltage test module can be used as independent power frequency voltage test devices, lightning impulse voltage test devices, and DC voltage test devices, respectively. When set to automatic test, the test measurement and control system adjusts the test wiring switch to a mode suitable for automatic test.

[0076] Preferably, the test wiring switch includes a plurality of primary switches, a secondary switch combination and a grounding switch combination; the number of primary switches is consistent with the number of secondary switch combinations; the secondary switch combination includes a plurality of switch devices;

[0077] Respectively connect the first end of each of the multiple primary switches to the corresponding power frequency voltage test module, lightning impulse voltage test module and DC voltage test module; respectively connect the second end of each of the multiple primary switches to the first end of each switch device in the corresponding secondary switch combination;

[0078] Two ends of the A phase, the B phase and the C phase of the switchgear sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination;

[0079] The second end of each switch device in the grounding switch assembly is connected to the grounding line.

[0080] Preferably, it also includes:

[0081] The test wiring transfer switch includes a plurality of primary switches, a secondary switch combination and a grounding switch combination; the number of primary switches is greater than the number of secondary switch combinations; the secondary switch combination includes a plurality of switch devices;

[0082] Respectively connect the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, lightning impulse voltage test module and DC voltage test module;

[0083] The second end of one or two of the plurality of primary switches is connected to the first end of each switch device in the secondary switch combination;

[0084] Two ends of the A phase, the B phase and the C phase of the switchgear sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination;

[0085] The second end of each switch device in the grounding switch assembly is connected to the grounding line.

[0086] Preferably, it also includes: setting the opening and closing states of the switch devices in the primary switch, the secondary switch combination and the grounding switch combination.

[0087] Preferably, the power frequency voltage test module provides the power frequency test voltage through a voltage regulator or a power electronic power supply plus a step-up transformer.

[0088] Preferably, the lightning impulse voltage test module provides the lightning impulse test voltage based on parallel charging and series discharging of capacitors.

[0089] Preferably, the connection mode between the measurement and control system and the power frequency voltage test module, the lightning impulse voltage test module and the DC voltage test module includes: communication cable connection and control cable connection.

[0090] Preferably, the switch device includes a high-voltage disconnector, a high-voltage circuit breaker, a high-voltage contactor and a vacuum switch.

[0091] Preferably, the switch device is enclosed in a gas box filled with sulfur hexafluoride gas.

[0092] The present invention supplies power to a power frequency voltage module, a lightning impulse voltage module and a direct current voltage test module respectively through three isolation transformers.

[0093] The test measurement and control system uses electromagnetic method to control the test wiring switch. Communication cables and control cables are connected between the test measurement and control system and the power frequency voltage module, lightning impulse voltage module and DC voltage test module. The test measurement and control system is connected through cables and voltage dividers to measure the test voltage.

[0094] like Figure 1As shown. The power frequency voltage module of the present invention is connected with switch devices K11, K12, K13, K14, K15, and K16 through switch device K1, the lightning impulse voltage module is connected with switch devices K21, K22, K23, K24, K25, and K26 through switch device K2, and the DC voltage module is connected with switch devices K31, K32, K33, K34, K35, and K36 through switch device K3. The grounding wire is connected with switch devices K41, K42, K43, K44, K45, and K46. One end of the A phase of the switch device sample KA is connected to K11, K21, K31, and K41; the other end of the A phase of the switch device sample KA is connected to K16, K26, K36, and K46; one end of the B phase of the switch device sample KA is connected to K12, K22, K32, and K42; the other end of the B phase of the switch device sample KA is connected to K15, K25, K35, and K45; one end of the C phase of the switch device sample KA is connected to K13, K23, K33, and K43; the other end of the C phase of the switch device sample KA is connected to K14, K24, K34, and K44.

[0095] The power frequency voltage test module, lightning impulse voltage test module and DC voltage test module of the present invention can be used independently in a manual test mode, and can form power frequency superimposed DC, lightning superimposed DC, and lightning superimposed power frequency.

[0096] The present invention uses a pole-mounted circuit breaker as an example to perform a power frequency withstand voltage test. The test wiring switch state in the high-voltage switchgear insulation test system is shown in Table 3.

[0097] Table 3 Test wiring switch status during power frequency withstand voltage test of pole-mounted circuit breaker

[0098]

[0099] Table 4 Test wiring switch status during the lightning impulse voltage test of the pole-mounted circuit breaker

[0100]

[0101] During the test process of the present invention, the circuit breaker on the sample column needs to change the closing and opening state. In the automatic test mode, manual operation can be adopted, and the test system can also be used to automatically control the closing and opening. When in the automatic test mode, if the program is set to manually operate the sample opening and closing, when the test program is carried out to the point where the sample needs to be opened, the test measurement and control system will ground the sample, pop up a prompt "Please manually open the sample", and there will be a voice prompt. After the manual operation of the opening, click to close the prompt box, and then automatically carry out subsequent tests. The test system automatically controls the closing and opening, and it is necessary to connect the secondary cable of the sample before the start of the test, and confirm that the sample secondary circuit test wiring is correct through the closing and opening operation. When in the automatic test mode, if the program is set to automatically operate the sample opening and closing, the test program will continue to execute after the test system gives the sample an opening instruction during the test.

[0102] Figure 2 The figure is a structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention.

[0103] like Figure 2 As shown, the power frequency voltage module is connected to the switch devices K11, K12, K13, K14, K15, and K16 through the switch device K1, the lightning impulse voltage module is connected to the switch devices K11, K12, K13, K14, K15, and K16 through the switch device K2, and the DC voltage module is connected to the switch devices K31, K32, K33, K34, K35, and K36 through the switch device K3. The grounding wire is connected to the switch devices K41, K42, K43, K44, K45, and K46. One end of the A phase of the switch device sample KA is connected to K11, K31, and K41; the other end of the A phase of the switch device sample KA is connected to K16, K36, and K46; one end of the B phase of the switch device sample KA is connected to K12, K32, and K42; the other end of the B phase of the switch device sample KA is connected to K15, K35, and K45; one end of the C phase of the switch device sample KA is connected to K13, K33, and K43; the other end of the C phase of the switch device sample KA is connected to K14, K34, and K44.

[0104] The present invention can form power frequency superimposed direct current and lightning superimposed direct current. Figure 1 Compared with the traditional electric power converter, it saves 6 switching devices and 1 set of voltage divider.

[0105] Figure 3 The figure is a structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention.

[0106] See Figure 3As shown. The auxiliary power frequency voltage module is connected to the switch devices K11, K12, K13, K14, K15, and K16 through the switch device K1, the power frequency voltage module is connected to the switch devices K21, K22, K23, K24, K25, and K26 through the switch device K2, and the lightning impulse voltage module is connected to the switch devices K31, K32, K33, K34, K35, and K36 through the switch device K3. The DC voltage module is connected to the switch devices K61, K62, K63, K64, K65, and K66 through the switch device K6.

[0107] The grounding wire is connected to the switch devices K41, K42, K43, K44, K45, and K46. One end of the A phase of the switch device sample KA is connected to K11, K31, and K41; the other end of the A phase of the switch device sample KA is connected to K16, K36, and K46; one end of the B phase of the switch device sample KA is connected to K12, K32, and K42; the other end of the B phase of the switch device sample KA is connected to K15, K35, and K45; one end of the C phase of the switch device sample KA is connected to K13, K33, and K43; the other end of the C phase of the switch device sample KA is connected to K14, K34, and K44.

[0108] Figure 3 The invention shown can form power frequency superimposed on direct current, lightning superimposed on direct current, or power frequency superimposed on power frequency, lightning superimposed on power frequency.

[0109] Figure 4 The figure is a structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention.

[0110] See Figure 4As shown. The power frequency voltage module is connected to the switch devices K11, K12, K13, K14, K15, and K16 through the switch device K1, the lightning impulse voltage module is connected to the switch devices K11, K12, K13, K14, K15, and K16 through the switch device K2, the auxiliary power frequency voltage module is connected to the switch devices K21, K22, K23, K24, K25, and K26 through the switch device K3, and the DC voltage module is connected to the switch devices K21, K22, K23, K24, K25, and K26 through the switch device K4. The grounding wire is connected to the switch devices K41, K42, K43, K44, K45, and K46. One end of the A phase of the switch device sample KA is connected to K11, K31, and K41; the other end of the A phase of the switch device sample KA is connected to K16, K36, and K46; one end of the B phase of the switch device sample KA is connected to K12, K32, and K42; the other end of the B phase of the switch device sample KA is connected to K15, K35, and K45; one end of the C phase of the switch device sample KA is connected to K13, K33, and K43; the other end of the C phase of the switch device sample KA is connected to K14, K34, and K44.

[0111] Figure 4 The invention shown can form power frequency superimposed on direct current, lightning superimposed on direct current, or power frequency superimposed on power frequency, lightning superimposed on power frequency.

[0112] Figure 5 The figure is a structural diagram of a high-voltage switchgear insulation test system according to a preferred embodiment of the present invention.

[0113] See Figure 5As shown. The lightning impulse voltage module is connected to the switch devices K11, K12, K13, K14, K15, and K16 through the switch device K1, the power frequency voltage module is connected to the switch devices K11, K12, K13, K14, K15, and K16 through the switch device K2, the DC voltage module is formed by the power frequency voltage rectification, the DC voltage module is connected to the switch devices K21, K22, K23, K24, K25, and K26 through the switch device K3, and the auxiliary power frequency voltage module is connected to the switch devices K21, K22, K23, K24, K25, and K26 through the switch device K4. The grounding wire is connected to the switch devices K41, K42, K43, K44, K45, and K46. One end of the A phase of the switch device sample KA is connected to K11, K31, and K41; the other end of the A phase of the switch device sample KA is connected to K16, K36, and K46; one end of the B phase of the switch device sample KA is connected to K12, K32, and K42; the other end of the B phase of the switch device sample KA is connected to K15, K35, and K45; one end of the C phase of the switch device sample KA is connected to K13, K33, and K43; the other end of the C phase of the switch device sample KA is connected to K14, K34, and K44.

[0114] Figure 5 The invention can form lightning superimposed DC and power frequency superimposed power frequency, lightning superimposed power frequency. Taking the pole-mounted circuit breaker as an example, the present invention calculates the power frequency voltage test and lightning impulse voltage test time comparison under the traditional manual test and automatic test, see Table 5 and Table 6.

[0115] Table 5 Comparison of power frequency voltage test time of pole-mounted circuit breakers

[0116]

[0117] Table 6 Comparison of lightning impulse voltage test time of pole-mounted circuit breakers

[0118]

[0119] It can be seen from Tables 5 and 6 that the application of the high-voltage switchgear insulation test system in the present invention can significantly improve the test efficiency and shorten the total test time; one tester can be saved in the automatic test process, only one tester is required to be on duty, and the labor intensity of the test is reduced; the automatic test reduces the risk of sample damage and equipment damage caused by irregular operation.

[0120] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0121] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0122] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0123] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0124] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0125] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0126] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0127] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of the means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A high voltage switchgear insulation test system, the system comprising: Power frequency voltage test module, lightning impulse voltage test module, DC voltage test module, test wiring switch and test measurement and control system; The power frequency voltage test module is used to provide a power frequency test voltage to the switchgear sample; The lightning impulse voltage test module is used to provide a lightning impulse test voltage to the switchgear sample; The DC voltage test module is used to provide a high-voltage DC test voltage to the switchgear sample; The test wiring switch includes a plurality of switch devices, and the switch devices include a plurality of opening and closing combination states; The measurement and control system is used to control the input of one of the power frequency test voltage, the lightning impulse test voltage, the high voltage DC test voltage, or a combination of two thereof into the switchgear sample via the test wiring switching switch to test the insulation of the switchgear sample.

2. The system according to claim 1, wherein the test mode of the measurement and control system comprises a manual test mode and an automatic test mode; When the test mode is the manual test mode, the test wiring switch is set to the manual switch test mode; When the test mode is the automatic test mode, the test wiring switching switch is set to the automatic switch test mode.

3. The system according to claim 1, wherein the test wiring switch comprises a plurality of primary switches, a plurality of secondary switch combinations and a grounding switch combination; the number of the primary switches is consistent with the number of the secondary switch combinations; the secondary switch combination comprises a plurality of switch devices; Respectively connect the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, the lightning impulse voltage test module and the DC voltage test module; respectively connect the second end of each of the plurality of primary switches to the first end of each switch device in the corresponding secondary switch combination; Two ends of the A phase, the B phase and the C phase of the switch device sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination; The second end of each switch device in the grounding switch assembly is connected to the grounding line.

4. The system according to claim 1, further comprising: The test wiring switch includes a plurality of primary switches, a secondary switch combination and a grounding switch combination; the number of the primary switches is greater than the number of the secondary switch combination; the secondary switch combination includes a plurality of switch devices; Respectively connecting the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, the lightning impulse voltage test module and the DC voltage test module; The second end of one or two of the plurality of primary switches is connected to the first end of each switch device in the secondary switch combination; Two ends of the A phase, the B phase and the C phase of the switch device sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination; The second end of each switch device in the grounding switch assembly is connected to the grounding line.

5. The system according to claim 1, further comprising an auxiliary power frequency voltage test module; The test wiring switch includes a plurality of primary switches, a plurality of secondary switch combinations and a grounding switch combination; the number of the primary switches is consistent with the number of the secondary switch combinations; the secondary switch combination includes a plurality of switch devices; Respectively connect the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, the lightning impulse voltage test module, the DC voltage test module and the auxiliary power frequency voltage test module; the second end of each of the plurality of primary switches is respectively connected to the first end of each switch device in the corresponding secondary switch combination; Two ends of the A phase, the B phase and the C phase of the switch device sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination; The second end of each switch device in the grounding switch assembly is connected to the grounding line.

6. The system according to claim 1, further comprising an auxiliary power frequency voltage test module; The test wiring switch includes a plurality of primary switches, a secondary switch combination and a grounding switch combination; the number of the primary switches is greater than the number of the secondary switch combination; the secondary switch combination includes a plurality of switch devices; Respectively connect the first end of each of the plurality of primary switches to the corresponding power frequency voltage test module, the lightning impulse voltage test module, the DC voltage test module and the auxiliary power frequency voltage test module; The second end of one or two of the plurality of primary switches is connected to the first end of each switch device in the secondary switch combination; Two ends of the A phase, the B phase and the C phase of the switch device sample are respectively connected to the second end of a switch device in the secondary switch combination, and to the first end of a switch device in the grounding switch combination; The second end of each switch device in the grounding switch assembly is connected to the grounding line.

7. The system according to any one of claims 3, 4, 5 or 6, further comprising: The opening and closing states of the switch devices in the primary switch, secondary switch combination and grounding switch combination are set.

8. The system according to claim 1, wherein the power frequency voltage test module provides the power frequency test voltage through a voltage regulator or a power electronic power supply plus a step-up transformer. 9 . The system according to claim 1 , wherein the lightning impulse voltage test module provides a lightning impulse test voltage based on parallel charging and series discharging of capacitors.

10. The system according to claim 1, wherein the connection between the measurement and control system and the power frequency voltage test module, the lightning impulse voltage test module and the DC voltage test module comprises: Communication cable connection and control cable connection.

11. The system according to claim 1, wherein the switch device comprises a high voltage disconnector, a high voltage circuit breaker, a high voltage contactor and a vacuum switch.

12. The system according to claim 1, wherein the switch device is enclosed in a gas box filled with sulfur hexafluoride gas.

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