CN202221465U - Power capacitor tolerance blasting energy testing apparatus - Google Patents
Power capacitor tolerance blasting energy testing apparatus Download PDFInfo
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- CN202221465U CN202221465U CN2011203254073U CN201120325407U CN202221465U CN 202221465 U CN202221465 U CN 202221465U CN 2011203254073 U CN2011203254073 U CN 2011203254073U CN 201120325407 U CN201120325407 U CN 201120325407U CN 202221465 U CN202221465 U CN 202221465U
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Abstract
The utility model discloses a power capacitor tolerance blasting energy testing apparatus which comprises a charging return circuit, a capacitor bank and discharging return circuit and a measuring system, wherein the charging circuit comprises a voltage regulator, a transformer, a protective resistor, a rectifier silicon stack and a high voltage gauge; the capacitor bank and discharging return circuit comprises an energy storage capacitor bank, a discharging switch, a test sample short and a test sample connecting wire; and the measuring system comprises a resistance-capacitance divider, a Rogowski coil and a transient data recorder. According to the apparatus disclosed by the utility model, a power-frequency alternate current withstand voltage device and the rectifier silicon stack are adopted in the charging return circuit and the charging return circuit can move and does not occupy the space of the apparatus at ordinary times; due to the capacitor bank and the discharging return circuit, the frequency of a discharging current and the ratio of adjacent peaks can be ensured as required; and the measuring system has a sampling frequency of 10MS/s, and the requirement for measuring a high-frequency large-current signal is met.
Description
Technical field
The utility model relates to a kind of power capacitor tolerance blasting energy test unit, belongs to the power capacitor technical field.
Background technology
High-voltage power capacitor (like shnt capacitor, filter capacitor, series capacitor etc.) is in operation interpolar penetrability puncture short fault takes place, and punctures pilosity usually to be born near the voltage peak, and this moment, the energy storage energy of capacitor was maximum; And power current is in zero cross near; This moment, all intact capacitors of direct parallel connection discharged to the fault capacitor short-circuit with it, injected significant amount of energy in this moment, at the strong electric arc of the inner formation of fault capacitor; Inner insulating medium and the impregnant of fault capacitor decomposes rapidly under the effect of internal arc; In the extremely short time, produce a large amount of gas and high temperature, impel the pressure in the tank of power capacitor to rise suddenly, the case shell and the insulator generation brute force of capacitor are impacted; When this burst impulsive force during greater than the physical strength of case shell or insulator; Explosion will take place in the case shell or the insulator of capacitor, and fault is further enlarged, and produces serious consequence.So the test of power industry standard DL/T 840-2003 " high-voltage parallel capacitor operation technique condition " regulation capacitor tolerance blasting energy is the type approval test project, requires to inject energy and is not less than 15kW.s (full film) or 10kW.s (film paper).Because this trial voltage grade high (more than the general 5kV), current amplitude big (tens kA are to hundreds of kA), frequency high (more than the 4kHz); Requirement to discharge loop RLC parameter is very high, and therefore designing a cover charging and discharging circuit and the satisfactory device of measuring system is technological difficulties.
The utility model content
The utility model provides a kind of novel power capacitor tolerance blasting energy test unit, and its charge circuit of the utility model device adopts the industrial frequency AC pressure-resistant apparatus to add rectification silicon stack, and is removable, do not account for the device space at ordinary times; Its capacitor group and discharge loop can guarantee that the frequency of discharge current and adjacent peakedness ratio meet the requirements; Its measuring system SF satisfies the big current signal measurement requirement of high frequency up to 10MS/s.
In order to reach above-mentioned purpose, the solution of the utility model is:
A kind of power capacitor tolerance blasting energy test unit comprises that device is by charge circuit, capacitor group and discharge loop and measuring system three parts; Wherein charge circuit comprises pressure regulator, transformer, protective resistance, rectification silicon stack and high pressure gauge; Capacitor group and discharge loop comprise energy-storage capacitor group, discharge switch, test product shorting stub, test product connecting line; Measuring system comprises RC divider, Luo-coil, transient data registering instrument; Described pressure regulator links to each other with transformer, and transformer one end is connected with protective resistance and rectification silicon stack successively, other end ground connection; And described transformer is parallelly connected with high pressure gauge, energy-storage capacitor group and RC divider successively; Described transformer is connected with discharge switch and test product connecting line, and described test product connecting line is parallelly connected with the test product shorting stub.Luo-coil is sleeved on the circuit between test product connecting line and the earth point; Be connected with the transient data registering instrument between described RC divider and the Luo-coil; Industrial frequency AC pressure-resistant apparatus (input 220V AC power, output voltage 0-50kV, capacity 10kVA) is adopted in the loop, adds rectification silicon stack, is output as the negative polarity DC voltage, and is removable, do not account for the device space at ordinary times.
Described energy-storage capacitor group two-layer symmetry, level up and down is the fan-shaped distribution, guarantees that the parameter of all single capacitor to points of common connection is consistent; Energy-storage capacitor group C can select the serial or parallel connection mode according to electric pressure, also can adjust parallelly connected platform number (1-40 of parallel connections) according to desired volume;
Described discharge switch adopts ball crack mode.
Described test product shorting stub resistance can be ignored; The test product connecting line is short as far as possible, and adopts and to be flexible coupling, and cannula tip is born extra electric power and impacted when avoiding discharging.
Described RC divider is measured the energy-storage capacitor voltage signal, and measurement range is 0-50kV.
Described Luo-coil is measured impulse discharge current signal, its measurement range 20-200kA, Frequency Response scope 130Hz-200kHz.
Described transient data registering instrument recording voltage current waveform, high sampling rate reaches 10MS/s.
The beneficial effect of the utility model is: a kind of power capacitor tolerance blasting energy test unit of the utility model, and its charge circuit adopts the industrial frequency AC pressure-resistant apparatus to add rectification silicon stack, and is removable, do not account for the device space at ordinary times; Its capacitor group and discharge loop, electric capacity is adjustable at 0-800uF, loop equivalent resistance m Ω level, equivalent inductance uH level, the frequency of discharge current and adjacent peakedness ratio meet the requirements during warranty test; Its measuring system SF satisfies the big current signal measurement requirement of high frequency up to 10MS/s.
Description of drawings
Fig. 1 is the utility model test unit key wiring diagram;
Fig. 2 is the utility model benchmark discharge test equivalent circuit diagram;
Fig. 3 is the utility model exemplary voltages current waveform figure.
Embodiment
A kind of power capacitor tolerance blasting energy test unit of present embodiment is as shown in Figure 1, comprises that device is by charge circuit, capacitor group and discharge loop and measuring system three parts; Wherein charge circuit comprises pressure regulator T1, transformer T2, protective resistance R, rectification silicon stack D and high pressure gauge V; Capacitor group and discharge loop comprise energy-storage capacitor group C, discharge switch K, test product shorting stub J1, test product connecting line J2; Measuring system comprises RC divider Fr, Luo-coil M, transient data registering instrument L; Described pressure regulator T1 links to each other with transformer T2, and transformer T2 one end is connected with protective resistance R and rectification silicon stack D successively, other end ground connection G; And described transformer T2 is parallelly connected with high pressure gauge V, energy-storage capacitor group C and RC divider Fr successively; Described transformer T2 connects with discharge switch K and test product connecting line J2, and described test product connecting line J2 is parallelly connected with test product shorting stub J1; Luo-coil M is sleeved on the circuit between test product connecting line J2 and the ground connection G point; Be connected with transient data registering instrument L between described RC divider Fr and the Luo-coil M.Industrial frequency AC pressure-resistant apparatus (input 220V AC power, output voltage 0-50kV, capacity 10kVA) is adopted in the loop, adds rectification silicon stack, is output as the negative polarity DC voltage,, removable, do not account for the device space at ordinary times.
Wherein two-layer symmetry, level are the fan-shaped distribution about the energy-storage capacitor group C, guarantee that the parameter of all single capacitor to points of common connection is consistent; The capacitor group can be selected the serial or parallel connection mode according to electric pressure, also can adjust parallelly connected platform number (1-40 of parallel connections) according to desired volume.
Discharge switch K adopts ball crack mode.
The connecting line J3 in whole loop adopts hard the connection, reduces the loop inductance parameter as far as possible.
Test product shorting stub J1 resistance can be ignored; Test product connecting line J2 is short as far as possible, and adopts and to be flexible coupling, and cannula tip is born extra electric power and impacted when avoiding discharging.
RC divider Fr measures the energy-storage capacitor voltage signal, and measurement range is 0-50kV.
Luo-coil M measures the impulse discharge current signal, makes tested electric current pass from the coil centermost as far as possible, its measurement range 20-200kA, Frequency Response scope 130Hz-200kHz.
Transient data registering instrument L recording voltage current waveform, high sampling rate reaches 10MS/s.
Test method: the test of capacitor tolerance blasting energy comprises benchmark discharge test and test product discharge test, and the former is used for verification and adjusts loop parameter, after the latter detects test product injection energy, and shell and insulator distortion situation.At first confirm rechargeable energy, energy-storage capacitor group desired volume and adjust the capacitor series-parallel system and the platform number, calculate charging voltage according to the specified blasting energy of test product.
1, benchmark discharge test.With test product shorting stub J1 short circuit test product Cx, through charge circuit energy-storage capacitor group C is charged, U reaches setting value when charging voltage, stops charging.Simultaneously, the discharge switch K that closes carries out pulsed discharge, its pulsed discharge equivalent circuit diagram as shown in Figure 2 (among the figure, C
0Energy-storage capacitor group electric capacity, K discharge switch, R
0The loop equivalent resistance, L
0The loop equivalent inductance, U charging voltage, I discharge current).Measure energy-storage capacitor group C charging voltage (close be sparking voltage when K switch) with RC divider Fr, Luo-coil M measures discharge current, adopts transient data registering instrument L to write down benchmark sparking voltage U and current waveform I, and its waveform is as shown in Figure 3.Calculate the frequency and the adjacent peakedness ratio of discharge current, require frequency to be not less than 4kHZ, adjacent peakedness ratio is not less than 0.8.
2, test product discharge test.Remove test product shorting stub J1, insert test product Cx, carry out capacitor group charge and discharge process equally, record test product sparking voltage current waveform.
Injecting energy calculates and the test findings criterion: according to energy Joule integral method or RLC cyclic current method, calculate test product and inject energy.Judge that test product injects energy and whether reaches specified blasting energy requirement, and whether test product shell and insulator explosion or leakage of oil appear.If energy does not reach requirement, then change test product, the adjustment loop parameter is tested again, if energy meets the requirements, explosion or leakage of oil do not appear in test product, think that then this test product is through test.
The above is merely the specific embodiment of the utility model, does not limit the protection domain of the utility model with this.Any equivalent transformation circuit of doing based on the utility model all belongs to the utility model protection domain.
Claims (7)
1. a power capacitor tolerance blasting energy test unit is characterized in that: comprise that device is by charge circuit, capacitor group and discharge loop and measuring system three parts; Wherein charge circuit comprises pressure regulator (T1), transformer (T2), protective resistance (R), rectification silicon stack (D) and high pressure gauge (V); Capacitor group and discharge loop comprise energy-storage capacitor group (C), discharge switch (K), test product shorting stub (J1), test product connecting line (J2); Measuring system comprises RC divider (Fr), Luo-coil (M), transient data registering instrument (L); Described pressure regulator (T1) links to each other with transformer (T2), and transformer (T2) end is connected with protective resistance (R) and rectification silicon stack (D) successively, other end ground connection (G); And described transformer (T2) is parallelly connected with high pressure gauge (V), energy-storage capacitor group (C) and RC divider (Fr) successively; Described transformer (T2) is connected with discharge switch (K) and test product connecting line (J2), and described test product connecting line (J2) is parallelly connected with test product shorting stub (J1); Luo-coil (M) is sleeved on the circuit between test product connecting line (J2) and ground connection (G) point; Be connected with transient data registering instrument (L) between described RC divider (Fr) and the Luo-coil (M).
2. a kind of power capacitor tolerance blasting energy test unit as claimed in claim 1; It is characterized in that: the two-layer up and down symmetry of described energy-storage capacitor group (C), level are fan-shaped and distribute; Energy-storage capacitor group (C) is selected the serial or parallel connection mode, and parallelly connected 1-40.
3. a kind of power capacitor tolerance blasting energy test unit as claimed in claim 1, it is characterized in that: described discharge switch (K) adopts ball crack mode.
4. a kind of power capacitor tolerance blasting energy test unit as claimed in claim 1, it is characterized in that: described test product shorting stub (J1) is short as far as possible with test product connecting line (J2), and employing is flexible coupling.
5. a kind of power capacitor tolerance blasting energy test unit as claimed in claim 1, it is characterized in that: described RC divider (Fr) is measured energy-storage capacitor (C) voltage signal, and measurement range is 0-50kV.
6. a kind of power capacitor tolerance blasting energy test unit as claimed in claim 1, it is characterized in that: described Luo-coil (M) is measured impulse discharge current signal, its measurement range 20-200kA, Frequency Response scope 130Hz-200kHz.
7. a kind of power capacitor tolerance blasting energy test unit as claimed in claim 1 is characterized in that: described transient data registering instrument (L) recording voltage current waveform, high sampling rate reaches 10MS/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203254073U CN202221465U (en) | 2011-09-01 | 2011-09-01 | Power capacitor tolerance blasting energy testing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203254073U CN202221465U (en) | 2011-09-01 | 2011-09-01 | Power capacitor tolerance blasting energy testing apparatus |
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| CN202221465U true CN202221465U (en) | 2012-05-16 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879683A (en) * | 2012-09-29 | 2013-01-16 | 中国西电电气股份有限公司 | Withstand explosion detection device and method for power capacitor |
| CN103558536A (en) * | 2013-11-01 | 2014-02-05 | 国家电网公司 | Circuit for testing overload tolerance capacity of series capacitor and working method of circuit |
| CN104034973A (en) * | 2014-05-06 | 2014-09-10 | 国家电网公司 | Electronic current transformer testing system and testing method |
| CN104166079A (en) * | 2014-08-29 | 2014-11-26 | 国家电网公司 | Method for detecting capacitor element frequency impact current in capacitor voltage transformer |
| CN108490299A (en) * | 2018-05-31 | 2018-09-04 | 中国工程物理研究院电子工程研究所 | A kind of high pressure detonation component parameter automatic test approach and equipment |
| CN108646098A (en) * | 2018-08-06 | 2018-10-12 | 无锡赛晶电力电容器有限公司 | A kind of test method of detection self-healing metallized dielectric capacitor capacitor internal ESL |
| CN108761289A (en) * | 2018-06-07 | 2018-11-06 | 哈尔滨理工大学 | A kind of high density capacitors quality and Withstand test device |
| CN112083303A (en) * | 2020-07-30 | 2020-12-15 | 中国电力科学研究院有限公司 | Device and method for measuring discharge current of capacitor element during breakdown |
-
2011
- 2011-09-01 CN CN2011203254073U patent/CN202221465U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879683A (en) * | 2012-09-29 | 2013-01-16 | 中国西电电气股份有限公司 | Withstand explosion detection device and method for power capacitor |
| CN102879683B (en) * | 2012-09-29 | 2014-12-24 | 中国西电电气股份有限公司 | Withstand explosion detection device and method for power capacitor |
| CN103558536A (en) * | 2013-11-01 | 2014-02-05 | 国家电网公司 | Circuit for testing overload tolerance capacity of series capacitor and working method of circuit |
| CN103558536B (en) * | 2013-11-01 | 2016-06-22 | 国家电网公司 | The circuit of test series capacitor tolerance capability of overload and method of work thereof |
| CN104034973A (en) * | 2014-05-06 | 2014-09-10 | 国家电网公司 | Electronic current transformer testing system and testing method |
| CN104166079A (en) * | 2014-08-29 | 2014-11-26 | 国家电网公司 | Method for detecting capacitor element frequency impact current in capacitor voltage transformer |
| CN108490299A (en) * | 2018-05-31 | 2018-09-04 | 中国工程物理研究院电子工程研究所 | A kind of high pressure detonation component parameter automatic test approach and equipment |
| CN108761289A (en) * | 2018-06-07 | 2018-11-06 | 哈尔滨理工大学 | A kind of high density capacitors quality and Withstand test device |
| CN108646098A (en) * | 2018-08-06 | 2018-10-12 | 无锡赛晶电力电容器有限公司 | A kind of test method of detection self-healing metallized dielectric capacitor capacitor internal ESL |
| CN112083303A (en) * | 2020-07-30 | 2020-12-15 | 中国电力科学研究院有限公司 | Device and method for measuring discharge current of capacitor element during breakdown |
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Granted publication date: 20120516 |
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