CN203798966U - Impact voltage-withstanding test system used for high-voltage electrical equipment insulation test - Google Patents
Impact voltage-withstanding test system used for high-voltage electrical equipment insulation test Download PDFInfo
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- CN203798966U CN203798966U CN201420081045.1U CN201420081045U CN203798966U CN 203798966 U CN203798966 U CN 203798966U CN 201420081045 U CN201420081045 U CN 201420081045U CN 203798966 U CN203798966 U CN 203798966U
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- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000009413 insulation Methods 0.000 title claims abstract description 14
- 238000004804 winding Methods 0.000 claims description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Abstract
The utility model discloses an impact voltage-withstanding test system used for a high-voltage electrical equipment insulation test. The system comprises an MCU controller; a voltage-boosting transformer with two primary coils and one secondary coil; a harmonic filter with accessing of a power grid power frequency AC signal; a relay which is connected in series between the harmonic filter and one primary coil of the voltage-boosting transformer and is connected with the MCU and controlled by the MCU; a pulse generator which is connected with the MCU and controlled by the MCU; a power amplifier which is connected in series between the pulse generator and the other primary coil of the voltage-boosting transformer; a current-limiting resistor which is connected in series between the secondary coil of the voltage-boosting transformer and the tested equipment; a resistance-capacitance voltage divider which is connected in parallel with the tested equipment; and an acquisition device which is connected in series between the resistance-capacitance voltage divider and the MCU and interacted with the resistance-capacitance voltage divider and the MCU and is responsible for acquiring voltage, current and phase information. Compared with systems in the prior art, a power grid access signal is directly utilized without internal generation of the power frequency AC signal so that system volume and control complexity can be effectively reduced, and system reliability can be enhanced.
Description
Technical field
The utility model relates to and a kind ofly produces and impact stack withstand voltage test signal and for the impulse voltage withstand test system of high voltage electric equipment Insulation test based on electrical network industrial frequency AC signal.
Background technology
Traditional impulse voltage withstand test system adopts discharging gap to amplify and exports to high-tension apparatus, does not possess power-frequency voltage output function, therefore cannot be operated in and need power-frequency voltage and shock pulse alternately or the environment of testing under acting in conjunction; Meanwhile, due to the restriction of pulse waveform, rising edge of a pulse control very flexible, the demand that cannot satisfy the demand while repeatedly adjusting flexibly rising edge of a pulse with research high voltage equipment insulation state, causes system applies to be restricted.If internal system arranges industrial frequency AC signal generator and power amplifier thereof, can make again system bulk increase, the complexity of system control raises, and causes system reliability to reduce.
Utility model content
The purpose of this utility model is exactly for the deficiencies in the prior art, a kind of impulse voltage withstand test system for high voltage electric equipment Insulation test is provided, directly utilize electrical network access signal, produce industrial frequency AC signal without internal system, only need to produce impact signal by digital control model, and realize the output of boosting of industrial frequency AC signal and impact signal in conjunction with many windings step-up transformer, thus effectively reduce system bulk and control complexity, improve system reliability.
For achieving the above object, the technical solution of the utility model is:
A kind of impulse voltage withstand test system for high voltage electric equipment Insulation Test the utility model proposes, specifically comprises: MCU controller; With the step-up transformer of two armature windings and a secondary winding; The harmonic filter of access electrical network industrial frequency AC signal; Be series between harmonic filter and step-up transformer one armature winding, be connected, be subject to simultaneously the relay of MCU controller control with MCU controller; Be connected, be subject to the pulse producer of MCU controller control with MCU controller; Be series at the power amplifier between another armature winding of pulse producer and step-up transformer; Be series at the current-limiting resistance between step-up transformer secondary winding and tested high-tension apparatus; The RC divider in parallel with tested high-tension apparatus; Be series between RC divider and MCU controller, carry out alternately with MCU controller, be responsible for the harvester that voltage, electric current and phase information gather.
The utility model directly utilizes one of them armature winding of electrical network industrial frequency AC signal access step-up transformer, the another one armature winding of the high-frequency percussion signal access step-up transformer that simultaneity factor internal pulses generator and power amplifier thereof produce, the impact stack withstand voltage test signal of the output of then boosting after step-up transformer stack is by step-up transformer secondary winding coupling output.Two armature windings and a secondary winding of described step-up transformer share an iron core.When test, first MCU controller pilot relay is connected the input of electrical network industrial frequency AC signal, now the primary and secondary of step-up transformer is all charged, and secondary winding has had boost signal, and at this moment the low voltage signal of extraction is directly offered harvester by RC divider; MCU controller obtains the now low voltage value of RC divider by controlling harvester, and is converted into the output voltage of step-up transformer by the intrinsic standoff ratio of RC divider; MCU controller is analyzed the power frequency voltage waveform that harvester gathers, and obtains the time response of power-frequency voltage, the time that crest voltage, zero-point voltage occur, and calculate accordingly the phase characteristic of current time power frequency ac voltage; MCU controller, according to the superposition phase feature of artificial input, finds after the phase place that current power-frequency voltage is corresponding, immediately the work of trigger generator; Pulse producer outputs to step-up transformer armature winding through power amplifier after producing shock pulse signal, after superposeing, forms at step-up transformer secondary winding the impact stack withstand voltage test signal that meets Phase Stacking requirement with electrical network industrial frequency AC signal; MCU controller obtains the phase information of impacting stack by the low voltage signal of controlling harvester Real-time Collection RC divider, and compare with the phase parameter of input, if there are differences, slightly adjust time delay or the phase characteristic of pulse producer, play correcting action.
Described harvester can obtain output load current by the mode of punching mutual inductor or the coupling of half opening clamp, then the current information of collection is sent to MCU controller, processed amplitude and the phase information of output voltage and output load current by MCU controller synthesis.Described current-limiting resistance plays the effect of overcurrent protection, in the time that output terminal impedance reduces or is put to the test voltage effect generation puncture short, can play the effect of protection step-up transformer.Simultaneously; MCU controller control harvester Real-time Obtaining output load current value; once exceed setting current value; and after continuing for some time; MCU controller pilot relay disconnects, and guarantees that the AC signal of step-up transformer input end is cut off, and the stop pulse generator work of giving an order; make step-up transformer other end armature winding without input signal, thereby played the object of system short-circuit protection.Equally, when output terminal occurs that, after superpotential phenomenon, MCU controller is ordered equally, disconnect the work of AC power frequency input and pulse producer.
The frequency of described pulse producer is 0.1-100MHz, after power amplification, can produce the shock pulse high pressure that tens of volts arrive tens of kilovolts.The output phase of described pulse producer, output frequency, output pulse width are all subject to the control of MCU controller.The output terminal of described power amplifier can also, with the rectification branch road change-over switch that is subject to the control of MCU controller, can be realized the output of positive shock pulse or negative shock pulse by this switch.
Described pilot system can also be provided with the communication interface being connected with described MCU controller, can be USB interface, or VGA interface, or RS232 interface, or WIFI interface, etc.Can also be provided with the display and the keyboard that are connected with described MCU controller.
Compared with prior art, the beneficial effects of the utility model are: directly utilize the industrial frequency AC signal of electrical network access to enter an armature winding of step-up transformer, can save industrial frequency AC signal generator and the power amplifier thereof of internal system, can effectively reduce system bulk, the complexity of reduction system control, improves system reliability; The pattern that adopts the stack of many windings step-up transformer direct-coupling, stack velocity is fast, manufactures and designs simply, can realize flexibly different Voltage-outputs by adjusting transformer voltage ratio.The utility model both can be used for independent shock pulse withstand voltage test, also can be used for independent power-frequency withstand voltage test, also can be used for the withstand voltage test under power frequency and shock pulse acting in conjunction.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is further described.
As shown in Figure 1.Carry out industrial frequency AC and the coefficient Insulation Test of shock pulse for 35kV transformer, adopt impulse voltage withstand test system of the present utility model to carry out.Described impulse voltage withstand test system comprises: MCU controller; Step-up transformer, no-load voltage ratio is 1:10, is with two armature windings and a secondary winding, armature winding and secondary winding share an iron core; Harmonic filter, access 50Hz electrical network industrial frequency AC signal; Relay, is series between harmonic filter and step-up transformer one armature winding, is connected, is subject to the control of MCU controller with MCU controller simultaneously; Pulse producer, frequency is 0.1-100MHz, and output amplitude is 500V, and pulse width is 10uS, and pulse duty factor is 1uS, is connected, is subject to the control of MCU controller with MCU controller; Power amplifier, is series between another armature winding of pulse producer and step-up transformer; Current-limiting resistance, is series between step-up transformer secondary winding and tested 35kV transformer; RC divider, intrinsic standoff ratio is 1000:1, with tested 35kV transformers connected in parallel; Harvester is double-channel analog/digital modular converter, and high sampling rate is 200MHz, is series between RC divider and MCU controller, carries out alternately with MCU controller, responsible voltage, electric current and phase information collection.Described impulse voltage withstand test system is also provided with the USB interface (can be also RS232 interface or WIFI interface), display and the keyboard that are connected with MCU controller.The superposition phase of described impulse voltage withstand test system is the two-way stack of peak value, realizes stack output when power-frequency voltage 90 degree and 270 are spent; Output over-voltage thresholding is 3kV, and excess current is 1A,, in the time that output voltage exceedes 3kV or output current and exceedes 1A, automatically disconnects input electrical network industrial frequency AC signal, and the work of stop pulse generator.
When test, first system output terminal is connected with tested 35kV transformer, then MCU controller pilot relay is connected the input of electrical network industrial frequency AC signal, and the low voltage signal of extraction is directly offered harvester by RC divider; The low-voltage that MCU controller obtains RC divider by harvester is 2.23V, and the magnitude of voltage that is converted into output terminal is 2230V, compound predetermined output requirement; MCU controller is analyzed the power frequency voltage waveform that harvester gathers, and calculates the time that peak phase occurs, the moment occurring in next crest voltage, starting impulse generator work immediately; Pulse producer outputs to step-up transformer armature winding through power amplifier after producing shock pulse signal; Now, the secondary composite wave-shape being output as under power frequency ac voltage and pulse voltage acting in conjunction of step-up transformer; MCU controller is that 2.730V, output load current are 2mA by the low-voltage of controlling harvester Real-time Obtaining RC divider, and the magnitude of voltage that is converted into output terminal is that the resistance of 2730V, output load is 2730V/2mA=1.365Mohm; Because output current and voltage are all in protection thresholding, therefore the transformer insulated intensity of tested 35kV is within acceptability limit, and the protection system of impulse voltage withstand test system is failure to actuate, and can continue output and impact stack withstand voltage test signal.
Claims (6)
1. for an impulse voltage withstand test system for high voltage electric equipment Insulation Test, it is characterized in that, described impulse voltage withstand test system comprises: MCU controller; With the step-up transformer of two armature windings and a secondary winding; The harmonic filter of access electrical network industrial frequency AC signal; Be series between harmonic filter and step-up transformer one armature winding, be connected, be subject to simultaneously the relay of MCU controller control with MCU controller; Be connected, be subject to the pulse producer of MCU controller control with MCU controller; Be series at the power amplifier between another armature winding of pulse producer and step-up transformer; Be series at the current-limiting resistance between step-up transformer secondary winding and tested high-tension apparatus; The RC divider in parallel with tested high-tension apparatus; Be series between RC divider and MCU controller, carry out alternately with MCU controller, be responsible for the harvester that voltage, electric current and phase information gather.
2. the impulse voltage withstand test system for high voltage electric equipment Insulation Test according to claim 1, is characterized in that: two armature windings and a secondary winding of described step-up transformer share an iron core.
3. the impulse voltage withstand test system for high voltage electric equipment Insulation Test according to claim 1, is characterized in that: the frequency of described pulse producer is 0.1-100MHz.
4. according to the arbitrary described impulse voltage withstand test system for high voltage electric equipment Insulation Test of claim 1-3, it is characterized in that: be provided with the communication interface being connected with described MCU controller.
5. the impulse voltage withstand test system for high voltage electric equipment Insulation Test according to claim 4, is characterized in that: described communication interface is USB interface, or RS232 interface, or WIFI interface.
6. according to the arbitrary described impulse voltage withstand test system for high voltage electric equipment Insulation Test of claim 1-3, it is characterized in that: be provided with the display and the keyboard that are connected with described MCU controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420081045.1U CN203798966U (en) | 2014-02-25 | 2014-02-25 | Impact voltage-withstanding test system used for high-voltage electrical equipment insulation test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420081045.1U CN203798966U (en) | 2014-02-25 | 2014-02-25 | Impact voltage-withstanding test system used for high-voltage electrical equipment insulation test |
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| CN203798966U true CN203798966U (en) | 2014-08-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301459A (en) * | 2015-11-24 | 2016-02-03 | 国网安徽省电力公司芜湖供电公司 | High-voltage power-frequency AC voltage-withstanding system measuring platform |
| CN105606978A (en) * | 2016-03-17 | 2016-05-25 | 国网辽宁省电力有限公司电力科学研究院 | Mixed gas breakdown voltage detector, and mixed gas breakdown voltage prediction method using the same |
| CN111239469A (en) * | 2018-11-28 | 2020-06-05 | 安徽美芝精密制造有限公司 | Impact signal detection circuit and alternating current power supply equipment |
| CN111751604A (en) * | 2020-07-01 | 2020-10-09 | 国网江苏省电力有限公司营销服务中心 | Steady-state test method and system for transient voltage overshoot value of direct-current voltage divider |
| CN113985227A (en) * | 2021-10-27 | 2022-01-28 | 云南电网有限责任公司电力科学研究院 | System and method for testing natural frequency of electromagnetic voltage transformer of distribution network |
-
2014
- 2014-02-25 CN CN201420081045.1U patent/CN203798966U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301459A (en) * | 2015-11-24 | 2016-02-03 | 国网安徽省电力公司芜湖供电公司 | High-voltage power-frequency AC voltage-withstanding system measuring platform |
| CN105301459B (en) * | 2015-11-24 | 2018-03-30 | 国网安徽省电力公司芜湖供电公司 | High pressure industrial frequency AC pressurized system measuring table |
| CN105606978A (en) * | 2016-03-17 | 2016-05-25 | 国网辽宁省电力有限公司电力科学研究院 | Mixed gas breakdown voltage detector, and mixed gas breakdown voltage prediction method using the same |
| CN105606978B (en) * | 2016-03-17 | 2018-08-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of mixed gas breakdown voltage detection device and prediction technique |
| CN111239469A (en) * | 2018-11-28 | 2020-06-05 | 安徽美芝精密制造有限公司 | Impact signal detection circuit and alternating current power supply equipment |
| CN111751604A (en) * | 2020-07-01 | 2020-10-09 | 国网江苏省电力有限公司营销服务中心 | Steady-state test method and system for transient voltage overshoot value of direct-current voltage divider |
| CN111751604B (en) * | 2020-07-01 | 2022-12-13 | 国网江苏省电力有限公司营销服务中心 | Steady-state test method and system for transient voltage overshoot value of direct-current voltage divider |
| CN113985227A (en) * | 2021-10-27 | 2022-01-28 | 云南电网有限责任公司电力科学研究院 | System and method for testing natural frequency of electromagnetic voltage transformer of distribution network |
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Granted publication date: 20140827 |
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