CN110780175A - Multifunctional high-voltage electrical equipment insulation testing device - Google Patents
Multifunctional high-voltage electrical equipment insulation testing device Download PDFInfo
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- CN110780175A CN110780175A CN201911245228.6A CN201911245228A CN110780175A CN 110780175 A CN110780175 A CN 110780175A CN 201911245228 A CN201911245228 A CN 201911245228A CN 110780175 A CN110780175 A CN 110780175A
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- 238000012360 testing method Methods 0.000 title claims abstract description 66
- 238000009413 insulation Methods 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000002955 isolation Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses an insulation test device of multifunctional high-voltage electrical equipment, which comprises a measuring circuit, a variable frequency power supply, a step-up transformer, a control panel, a Cx reverse wiring current detection module, a Cx forward wiring current detection module and a resistance test module, wherein the input end of the variable frequency power supply is connected with a main power supply, the output end of the variable frequency power supply is connected with the step-up transformer, the step-up transformer is sequentially connected with a CVT isolation module and the Cx reverse wiring current detection module, the step-up transformer is also connected with a CVT low-voltage output end, the high-voltage output end of the step-up transformer is connected to the measuring circuit through a CVT reverse wiring and an internal capacitor Cn which are connected in parallel, the measuring circuit is connected to the C x reverse wiring current detection module, the C. The invention can realize insulation resistance test and dielectric loss multi-channel test, and reduce the operation time and operation risk while ensuring the accuracy of test data.
Description
Technical Field
The invention belongs to the technical field of electrical equipment insulation test equipment, and relates to a multifunctional high-voltage electrical equipment insulation test device.
Background
At present, in transformer substation equipment maintenance and test, dielectric loss and insulation resistance test are required to be carried out on each equipment, a dielectric loss tester and an insulation resistance tester are required to be carried, and respective wiring is required to be carried out, wiring on a test site is complicated, the test working time is long, the efficiency is low, and the repeated wiring dismantling can cause some damage to tested equipment.
In order to solve the existing problems, the dielectric loss and insulation resistance testing function of one instrument is realized, the insulation resistance testing function is added on the basis of a dielectric loss tester, and the instrument has the dielectric loss multi-channel test function, can measure the dielectric loss, the insulation resistance, the absorption ratio and the polarization index of various high-voltage electrical equipment (such as a transformer, an electric reactor, a capacitor, a circuit breaker, a mutual inductor and the like), and is simultaneously suitable for measuring the dielectric loss and the insulation resistance of a power cable. The operation personnel only need a equipment to carry out single wiring, just can accomplish and be situated between and decrease test and insulation resistance test work, when guaranteeing test data accuracy, reduces activity duration and operation risk.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a multi-functional high voltage electrical equipment insulation test device to solve the problem that exists among the prior art.
The technical scheme adopted by the invention is as follows: a multifunctional insulation test device for high-voltage electrical equipment comprises a measuring circuit, a variable-frequency power supply, and a step-up transformer, control panel, C x reverse wiring current detection module, Cx forward wiring current detection module and resistance test module, the total power is connected to the variable frequency power supply input, the output connects step up transformer, step up transformer's high voltage output end connects gradually to CVT isolation module and C x reverse wiring current detection module, step up transformer's low voltage output end still is connected with CVT low voltage output end, step up transformer's high voltage output end is connected to measuring circuit through parallelly connected CVT rewiring and internal capacitance Cn, measuring circuit is connected to C x reverse wiring current detection module through digital isolation communication module, Cx forward wiring current detection module and resistance test module are connected to measuring circuit, measuring circuit is connected to control panel, control panel is connected to display and button.
Preferably, the C x reverse connection current detection module, the Cx positive connection current detection module, the output end of the resistance test module, and the low voltage output end of the CVT are all provided with sockets, and the sockets are installed on the tester casing.
Preferably, the variable frequency power supply adopts an SPWM switching circuit to generate high-power sine wave voltage-stabilizing output.
Preferably, the control panel is further connected with a printer and a communication interface.
The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:
1) the invention solves the problems of complex wiring for testing dielectric loss and insulation resistance and inconvenient carrying of instruments; the testing device saves time and labor, and the testing personnel can simultaneously measure dielectric loss and insulation resistance through one-time wiring, so that the field workload is reduced, the cost is reduced, and the efficiency is improved;
2) the invention has the function of dielectric loss multi-channel test, and can simultaneously test the positive wiring dielectric loss data of 4 test articles; if the dielectric loss of the transformer bushing is tested, four bushing dielectric loss tests can be completed by one-time wiring; the trouble of frequently replacing the test wire when climbing up and down is reduced. Meanwhile, the safety of personnel and equipment is also guaranteed;
3) the instrument has a data printing and storing function, and is convenient for management and analysis of test data.
The temperature in the waste gas pipe reaches 150-.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a schematic flow diagram of the operation of the control software;
FIG. 3 is a schematic block diagram of AC/DC conversion;
FIG. 4 is a multi-pass test function wiring diagram;
fig. 5 is a wiring diagram of insulation resistance test function.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 1-5, an insulation testing device for multifunctional high-voltage electrical equipment comprises a measuring circuit, a variable-frequency power supply, a step-up transformer, a control panel, C x reverse wiring current detection module, Cx forward wiring current detection module and a resistance test module, wherein the input end of the variable-frequency power supply is connected with a main power supply, the output end is connected with the step-up transformer, the high-voltage output end of the step-up transformer is sequentially connected with a CVT isolation module and a C x reverse wiring current detection module, the low-voltage output end of the step-up transformer is further connected with a CVT low-voltage output end, the high-voltage output end of the step-up transformer is connected to the measuring circuit through parallel CVT reverse wiring and an internal capacitor Cn, the measuring circuit is connected to a C x reverse wiring current detection module through a digital isolation communication module, the Cx forward wiring current detection module and the, the control panel is connected to the display and the keys.
Preferably, the C x reverse connection current detection module, the Cx positive connection current detection module, the output end of the resistance test module, and the low voltage output end of the CVT are all provided with sockets, and the sockets are installed on the tester casing.
Preferably, the variable frequency power supply adopts an SPWM switching circuit to generate high-power sine wave voltage-stabilizing output.
Preferably, the control panel is further connected with a printer and a communication interface.
The invention adds the insulation resistance test function on the basis of the dielectric loss tester, has dielectric loss multi-channel test, can measure the dielectric loss, the insulation resistance, the absorption ratio and the polarization index of various high-voltage electrical equipment (such as a transformer, an electric reactor, a capacitor, a circuit breaker, a mutual inductor and the like), and is simultaneously suitable for measuring the dielectric loss and the insulation resistance of a power cable. The operation personnel only need a equipment to carry out single wiring, just can accomplish and be situated between and decrease test and insulation resistance test work, when guaranteeing test data accuracy, reduces activity duration and operation risk.
The instrument of the invention can automatically switch dielectric loss and insulation resistance tests. The clear panel operation and LCD display make the measurement very convenient and fast.
The output short circuit current can be directly measured without the need for on-load measurement for estimation. The device has the functions of quick measurement time and continuous test. The realization function is as follows:
1. the device has the functions of measuring insulation resistance/absorption ratio/polarization index, measuring dielectric loss Cx and tg delta and measuring CVT transformation ratio;
2. has the functions of 4-channel positive connection and 1-channel reverse connection;
3. the wiring of the insulation resistor is completely the same as the wiring for dielectric loss measurement, the shielding mode suitable for dielectric loss measurement is also suitable for the insulation resistor, and when the insulation resistor is measured, the workload of wiring is not increased;
4. the device has a plurality of working modes of positive/negative wiring, internal/external standard capacitance, internal/external high voltage and an integrated structure, can be used for various conventional dielectric loss tests, and does not need any external auxiliary equipment;
the specific contents are as follows:
(one) hardware circuit principle structure, as shown in FIG. 1
The digital high-voltage insulation resistance test consists of a medium-large scale integrated circuit. The device has the characteristics of large output power, high short-circuit current value and multiple output voltage grades, can meet the test requirements of various field devices, and has the following working principle:
1. the design of a stable and high-power direct-current high-voltage power supply comprises the following steps: the high voltage power supply output by the built-in dielectric loss test generates direct current voltage through AC/DC conversion, and the direct current voltage is output from the E pole and reaches the L pole through the tested object.
2. Designing a high-precision measurement circuit: the current from E to L pole is converted by A/D and sent to the measuring system of the dielectric loss instrument, after the CPU completes the operation, the test result is displayed by LCD or output by printer.
3. Measurement range: short circuit current is greater than 100 mA; the output voltage is 250-10000V, and the measuring resistance is 100K omega-1T omega
A measurement circuit: fourier transform, complex operation and other calculations, range switching, variable frequency power control and the like.
A control panel: printer, keyboard, display and communication relay.
Variable frequency power supply: the SPWM switching circuit is adopted to generate high-power sine wave voltage-stabilizing output.
A step-up transformer: and boosting the output of the variable frequency power supply to a measurement voltage, and outputting the maximum reactive power of 2kVA/1 min.
Dielectric loss forward test: cx positive wire current detection: only for positive wire measurements.
Cx reverse wiring current detection: only for reverse wire measurements.
And (3) resistance testing: the measurement control circuit converts alternating-current high voltage into direct-current voltage signals to realize the insulation resistance test function.
Reverse wiring digital isolation communication: the reverse wiring current signal is sent to the low voltage side by a high speed digital isolation communication circuit.
After the measurement is started, a high-voltage set value is sent to the variable-frequency power supply, the output slow speed of the variable-frequency power supply is adjusted to the set value through a PID algorithm, the measured high voltage is sent to the variable-frequency power supply through the measuring circuit, the low voltage is finely adjusted, and accurate high-voltage output is achieved. According to the arrangement of the positive/reverse connection wire and the internal/external standard capacitor, the measuring circuit automatically selects input and switches measuring ranges according to test current, the measuring circuit filters interference by adopting Fourier transform, signal fundamental waves are separated, vector operation is carried out on the standard current and the test current, the amplitude value calculates capacitance, and the angular difference calculates tg delta. The measurements are repeated a number of times and an intermediate result is selected by sorting. And after the measurement is finished, the measurement circuit sends a voltage reduction instruction to slowly reduce the voltage of the variable frequency power supply to 0.
(II) host software design idea, as shown in FIG. 2.
The main program is divided into three parts of initialization, measurement, display and key processing.
(1) Initialization:
initializing a system: the hardware interface comprises basic interface, display, Bluetooth and the like, and simultaneously reads information such as factory parameters, current menu setting, stored data and the like.
Starting up a picture: the instrument will detect the key operation simultaneously and enter as required: factory parameter setting pictures (mainly factory calibration data), common setting pictures (calendar clock, serial port address and the like),
(2) Measurement:
AD sampling: and after receiving the synchronous code, starting sampling, taking charge of sampling voltage and current data, and then obtaining phasor data through FFT. The latter calculation will select the data as required and the data that is not used will be ignored.
And (4) data storage: here waiting for data to merge together. And simultaneously, relevant preset parameters (measuring mode, Ku and Ku) are stored together.
Averaging: for reducing data fluctuations. The instrument averages the data with 8 measurements and the data has a settling time of about 5 seconds.
(3) Display and key processing
And (3) displaying data: the instrument selects the original data and calculates the result to display according to the requirement (different measurement settings and data picture formats).
And (3) key processing: including setting measurement parameters and the like.
Storing the printing communication: under the control of the key, entering a data storage picture or printing data. The communication is to read the received command according to the inquiry mode, and execute the command or send back the data according to the requirement of the communication protocol.
Main technical difficult point and solution
The output voltage of the dielectric loss testing instrument is a stable positive sine wave alternating current signal, and the insulation resistance testing needs direct current voltage testing, so that the problem of converting alternating current voltage into direct current voltage needs to be solved. The high-power rectification is adopted to convert alternating-current voltage into stable direct-current voltage through output filtering. The step-by-step sampling is carried out for voltage rectification filtering, so that the stability of output voltage is ensured, the problem of heat generation and heat dissipation of a high-power rectifier tube can be reduced, other components in the instrument are protected from being stable, and the testing precision of the instrument is ensured, as shown in fig. 3.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.
Claims (4)
1. The utility model provides a multi-functional high voltage electrical equipment insulation test device which characterized in that: the device comprises a measuring circuit, a variable frequency power supply, a step-up transformer, a control panel, C x reverse wiring current detection module, Cx forward wiring current detection module and a resistance test module, a main power supply is connected to the input end of the variable frequency power supply, the output end is connected with the step-up transformer, the high-voltage output end of the step-up transformer is sequentially connected to a CVT isolation module and a C x reverse wiring current detection module, the low-voltage output end of the step-up transformer is further connected with a CVT low-voltage output end, the high-voltage output end of the step-up transformer is connected to the measuring circuit through a parallel CVT reverse wiring and an internal capacitor Cn, the measuring circuit is connected to the C x reverse wiring current detection module through a digital isolation communication module, the Cx forward wiring current detection module and the resistance test module are.
2. The multifunctional insulation test device for high-voltage electrical equipment according to claim 1, wherein: c x the reverse wiring current detection module, the Cx positive wiring current detection module, the output end of the resistance test module and the low voltage output end of the CVT are all provided with a socket which is arranged on the shell of the tester.
3. The multifunctional insulation test device for high-voltage electrical equipment according to claim 1, wherein: the variable frequency power supply adopts an SPWM switching circuit to generate high-power sine wave voltage-stabilizing output.
4. The multifunctional insulation test device for high-voltage electrical equipment according to claim 1, wherein: the control panel is also connected with a printer and a communication interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911245228.6A CN110780175A (en) | 2019-12-06 | 2019-12-06 | Multifunctional high-voltage electrical equipment insulation testing device |
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| CN201911245228.6A CN110780175A (en) | 2019-12-06 | 2019-12-06 | Multifunctional high-voltage electrical equipment insulation testing device |
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| CN110780175A true CN110780175A (en) | 2020-02-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111751587A (en) * | 2020-07-15 | 2020-10-09 | 武汉启亦电气有限公司 | Dielectric loss test power supply based on high-frequency power electronic transformation technology |
| CN112630532A (en) * | 2020-03-24 | 2021-04-09 | 济南高试电力设备有限公司 | Intelligent voice type anti-interference insulation resistance tester |
| CN113325305A (en) * | 2021-06-03 | 2021-08-31 | 贵州电网有限责任公司 | 500kV circuit breaker high-voltage electrical test wiring device and use method thereof |
| CN115291029A (en) * | 2022-10-10 | 2022-11-04 | 北京理工大学 | Device and method for detecting boosting performance of capacitor and transformer |
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| CN103018576A (en) * | 2012-12-03 | 2013-04-03 | 杭州西湖电子研究所 | Method for measuring dielectric loss factor and insulation resistance of power transformer |
| CN206497158U (en) * | 2017-02-13 | 2017-09-15 | 任守华 | A kind of dielectric loss tester for possessing insulation measurement function |
| CN107356815A (en) * | 2017-07-14 | 2017-11-17 | 国网福建省电力有限公司 | The automatic detection instrument of Transformer Winding insulaion resistance and dielectric loss |
| CN208224387U (en) * | 2018-05-17 | 2018-12-11 | 西安锐驰电器有限公司 | Integrated power transformation integrated test system |
| CN109142881A (en) * | 2018-08-11 | 2019-01-04 | 国网湖南省电力有限公司电力科学研究院 | Intelligent switching wire device for electrical test of power transformer |
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2019
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102508087A (en) * | 2011-12-26 | 2012-06-20 | 石家庄供电公司 | Integrated test stand for transformers |
| CN103018576A (en) * | 2012-12-03 | 2013-04-03 | 杭州西湖电子研究所 | Method for measuring dielectric loss factor and insulation resistance of power transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630532A (en) * | 2020-03-24 | 2021-04-09 | 济南高试电力设备有限公司 | Intelligent voice type anti-interference insulation resistance tester |
| CN111751587A (en) * | 2020-07-15 | 2020-10-09 | 武汉启亦电气有限公司 | Dielectric loss test power supply based on high-frequency power electronic transformation technology |
| CN113325305A (en) * | 2021-06-03 | 2021-08-31 | 贵州电网有限责任公司 | 500kV circuit breaker high-voltage electrical test wiring device and use method thereof |
| CN115291029A (en) * | 2022-10-10 | 2022-11-04 | 北京理工大学 | Device and method for detecting boosting performance of capacitor and transformer |
| CN115291029B (en) * | 2022-10-10 | 2022-12-30 | 北京理工大学 | Device and method for detecting boosting performance of capacitor and transformer |
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