CN203519773U - Portable dry-type air-core reactor turn-to-turn insulation pulse vibration test device - Google Patents
Portable dry-type air-core reactor turn-to-turn insulation pulse vibration test device Download PDFInfo
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- CN203519773U CN203519773U CN201320687491.2U CN201320687491U CN203519773U CN 203519773 U CN203519773 U CN 203519773U CN 201320687491 U CN201320687491 U CN 201320687491U CN 203519773 U CN203519773 U CN 203519773U
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 238000009413 insulation Methods 0.000 title claims abstract description 32
- 238000013016 damping Methods 0.000 claims abstract description 15
- 238000004146 energy storage Methods 0.000 claims description 40
- 235000004443 Ricinus communis Nutrition 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 abstract description 4
- 230000010355 oscillation Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000007600 charging Methods 0.000 description 3
- 239000006187 pill Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model discloses a portable dry-type air-core reactor turn-to-turn insulation pulse vibration test device, and relates to a portable pulse vibration test device. The portable dry-type air-core reactor turn-to-turn insulation pulse vibration test device can be used to solve problems of large size and inconvenient carrying of a conventional dry-type air-core reactor turn-to-turn insulation pulse vibration test device. The portable dry-type air-core reactor turn-to-turn insulation pulse vibration test device comprises a voltage regulator, an oscilloscope, a direct-current high-voltage power source, an ignition sphere gap switch, a damping resistor, a stored energy and voltage measuring device and a box. The stored energy and voltage measuring device is placed into the box. The bottom portion of the box is provided with N wheels, wherein N is an integral number which is greater than 4. The direct-current high-voltage power source operates in the half-wave rectification mode, when a voltage is outputted from the direct-current high-voltage power source, the ignition sphere gap switch is controlled to be in the switch-off state, and a main capacitor is charged by the direct-current high-voltage power source; and when no voltage is outputted from the direct-current high-voltage power source, the ignition sphere gap switch is switched on, the main capacitor is used to discharge a reactor sample to obtain an exponential oscillation attenuation wave satisfying the standard requirement. The portable dry-type air-core reactor turn-to-turn insulation pulse vibration test device of the utility model is used for dry-type air-core reactor turn-to-turn insulation detection.
Description
Technical field
The utility model relates to a kind of Portable pulse shaking test device.
Background technology
For regulating the reactive power of electrical network, in the design standards of UHV (ultra-high voltage), large electricity grid substation, require the reactor of serial or parallel connection some, in this external electrical network, reactor is also usually used in the occasions such as filtering, current limliting.Compare with traditional oil immersed type iron core reactor, dry-type air-core reactor possess reactance value linearity, simple in structure, lightweight, be difficult for the advantages such as magnetic saturation, thereby its quantity that puts into operation increases sharply.Along with dry reactor put into operation quantity and the increase of the time of putting into operation, fault also progressively increases.Coil makes moist, fault in material, local overheating, switching frequent and the fault such as local arc finally can cause the turn-to-turn short circuit of reactor to burn reactor, even causes larger accident.Tradition is for to check reactor turn-to-turn whether to have the method for defect is mainly lightning impulse voltage method, but due to lightning impulse voltage method exist fault before and after wave form varies not obvious, easily cause the shortcoming of erroneous judgement.In recent years increasing standard recommendation adopts impulse hunting voltage method to check the turn-to-turn insulation situation of dry-type air-core reactor.
Because the trial voltage of impulse hunting voltage method is higher, need larger insulation distance, so the test unit of selling in the market mostly more greatly, heavier, be only suitable for being fixed on factory or laboratory and use, can not meet the portable requirement of site test.But show according to related data, in the factory inspection process of reactor, high-frequency impulse succusion detects the probability less than 2% of turn-to-turn insulation fault, but in the process of reactor being tested at substation field, high-frequency impulse succusion detects the probability of turn-to-turn insulation fault up to 15.58%.The turn-to-turn insulation fault majority of this explanation dry-type air-core reactor forms gradually after putting into operation, also illustrate that it is very necessary that operating dry-type air-core reactor is carried out to periodic inspection, this just need to be able to conveniently move, the testing equipment that can test reactor at substation field.
By in GB1094.6-2011 standard to dry reactor turn-to-turn superpotential test determination: the test of the turn-to-turn superpotential of dry-type air-core reactor is by repeating to discharge and recharge to electric capacity, and by ball gap, voltage is applied on tested reactor winding, test principle figure when dry reactor turn-to-turn superpotential is tested in this regulation is shown in accompanying drawing 3, L ' expression reactor wherein, C is charging capacitor, R is the damping resistance of capacitive divider, C
1for dividing potential drop electric capacity, C
2for variable capacitance; Duration of test runs 1min, the initial spike of each electric discharge should be steady state value, and response frequency is the function of winding inductance and charging capacitor, for
generally, at 100kHz and following, should comprise and be not less than 3000 superpotential that require amplitude.
Utility model content
The utility model is in order to solve traditional, problem of being not easy to carry large for dry-type air-core reactor turn-to-turn insulation impulse hunting test unit volume, to the invention provides a kind of portable dry type air reactor turn-to-turn insulation impulse hunting test unit.
Portable dry type air reactor turn-to-turn insulation impulse hunting test unit, it comprises pressure regulator, oscillograph, DC high-voltage power supply, igniting sphere gap switch, damping resistance, energy storage and voltage measuring apparatus and casing;
The voltage signal input end of described pressure regulator is used for receiving electric signal, the control signal input end of this pressure regulator is for reception control signal, the electrical signal of pressure regulator is connected with the electric signal input end of DC high-voltage power supply, the ground connection termination the earth of pressure regulator, described oscillographic electric signal input end is connected with the first electrical signal of voltage measuring apparatus with energy storage, the high pressure ground end of described DC high-voltage power supply, the first output terminal of DC high-voltage power supply, the high pressure ground end of the high pressure ground end of igniting sphere gap switch and energy storage and voltage measuring apparatus connects the earth simultaneously, the high-voltage signal output terminal of described DC high-voltage power supply is connected with the high-voltage signal input end of igniting sphere gap switch, the control signal input end of igniting sphere gap switch is used for receiving control ball gap signal, the igniting electrical signal of sphere gap switch and one end of damping resistance are connected, the other end of damping resistance is connected with the electric signal input end of voltage measuring apparatus with energy storage, the second electrical signal of energy storage and voltage measuring apparatus is for one end of linked reactor test product, the 3rd electrical signal of energy storage and voltage measuring apparatus is for the other end of linked reactor test product, described energy storage and voltage measuring apparatus are placed in casing, and the bottom of casing is provided with N wheel, and described N is more than or equal to 4 integer.
Described energy storage and voltage measuring apparatus comprise resitstance voltage divider, main capacitance and capacitive divider, the DC voltage output end of described resitstance voltage divider is for output dc voltage, described resitstance voltage divider electric signal input end is connected with the other end of damping resistance, the electrical signal of resitstance voltage divider is connected with one end of main capacitance, the high pressure ground end of resitstance voltage divider is connected with the high pressure ground end of capacitive divider, the other end of described main capacitance is connected with the electric signal input end of capacitive divider, the first electrical signal of described capacitive divider is connected with oscillographic electric signal input end, the second electrical signal of capacitive divider is connected with one end of reactor test product, the 3rd electrical signal of capacitive divider is connected with the other end of reactor test product, the high pressure ground end that the high pressure ground end of described resitstance voltage divider is energy storage and voltage measuring apparatus,
Described resitstance voltage divider electric signal input end is the electric signal input end of energy storage and voltage measuring apparatus;
The first electrical signal of described capacitive divider is the first electrical signal of energy storage and voltage measuring apparatus;
The second electrical signal of capacitive divider is the second electrical signal of energy storage and voltage measuring apparatus;
The 3rd electrical signal of capacitive divider is the 3rd electrical signal of energy storage and voltage measuring apparatus.
Described ignition pill gap switch package is in housing, and this housing bottom is provided with castor.
Described pressure regulator is with shell, and this outer casing bottom is provided with castor.
The assembly drawing of portable dry type air reactor turn-to-turn insulation impulse hunting test unit mesohigh parts described in the utility model, as shown in Figure 2, the overall work mode of test unit is for meeting the trial voltage of standard-required by controlling the buck of pressure regulator output voltage and the duty realization outputs such as break-make of igniting sphere gap switch, the utility model volume is little, easy to carry.
The effect of pressure regulator is to make the input voltage of DC high-voltage power supply meet 0～U
enter specifiedadjustable continuously, thus make DC high-voltage power supply output voltage meet 0～U
specifiedadjustable continuously, to meet the test needs of different electric pressure reactors; Oscillographic effect is to show the waveform that is applied to voltage on reactor test product of being sent back to by capacitive divider; The effect of igniting sphere gap switch is the duty that changes circuit; The effect of damping resistance is to absorb part energy in the process of reactor test product being discharged at main capacitance; The effect of the main capacitance in energy storage and voltage measuring apparatus is under the state disconnecting at igniting sphere gap switch, store certain electric charge, under the state of ignition pill gap switch connection, reactor test product is discharged, on reactor test product, be met the trial voltage of standard regulation, the effect of resitstance voltage divider is that high direct voltage is changed into the voltage that digital display meter can show, the effect of capacitive divider is that higher impulse hunting voltage is changed into the low pressure that oscillograph can show.
The size of dwindling to greatest extent each parts in the situation that of permission at compressive resistance, insulation margin; The parts that can be immersed in pressure regulator oil are immersed in pressure regulator oil, to reduce the size (dielectric strength of pressure regulator oil is much larger than the dielectric strength of air) of each parts; Can be integrated into the parts in shell is put in a shell to reduce the quantity of parts; And some parts is all installed wheel so that mobile.Each parts are easy to carry, are convenient to dismounting, and volume reduces 40%.
Accompanying drawing explanation
Fig. 1 is the elementary diagram of portable dry type air reactor turn-to-turn insulation impulse hunting test unit described in the utility model.
Fig. 2 is the assembly drawing of portable dry type air reactor turn-to-turn insulation impulse hunting test unit mesohigh parts described in the utility model.
Fig. 3 is to carrying out the dry reactor turn-to-turn superpotential principle schematic in when test in GB1094.6-2011 standard.
Embodiment
Embodiment one: present embodiment is described referring to Fig. 1, portable dry type air reactor turn-to-turn insulation impulse hunting test unit described in present embodiment, it comprises pressure regulator 1, oscillograph 2, DC high-voltage power supply 3, igniting sphere gap switch 4, damping resistance 5, energy storage and voltage measuring apparatus 9 and casing;
The voltage signal input end of described pressure regulator 1 is used for receiving electric signal, the control signal input end of this pressure regulator 1 is for reception control signal, the electrical signal of pressure regulator 1 is connected with the electric signal input end of DC high-voltage power supply 3, the ground connection termination the earth of pressure regulator 1, the electric signal input end of described oscillograph 2 is connected with the first electrical signal of voltage measuring apparatus 9 with energy storage, the high pressure ground end of described DC high-voltage power supply 3, the first output terminal of DC high-voltage power supply 3, the high pressure ground end of the high pressure ground end of igniting sphere gap switch 4 and energy storage and voltage measuring apparatus 9 connects the earth simultaneously, the high-voltage signal output terminal of described DC high-voltage power supply 3 is connected with the high-voltage signal input end of igniting sphere gap switch 4, the control signal input end of igniting sphere gap switch 4 is used for receiving control ball gap signal, the electrical signal of igniting sphere gap switch 4 is connected with one end of damping resistance 5, the other end of damping resistance 5 is connected with the electric signal input end of voltage measuring apparatus 9 with energy storage, the second electrical signal of energy storage and voltage measuring apparatus 9 is for one end of linked reactor test product, the 3rd electrical signal of energy storage and voltage measuring apparatus 9 is for the other end of linked reactor test product, described energy storage and voltage measuring apparatus 9 are placed in casing, and the bottom of casing is provided with N wheel, and described N is greater than 4 integer.
In present embodiment, DC high-voltage power supply 3 takes the mode of half-wave rectification to work, and in DC high-voltage power supply 3 has the time of output, reference mark fire sphere gap switch 4, in off-state, is charged to main capacitance by DC high-voltage power supply 3; Within the time of DC high-voltage power supply 3 Non voltage outputs, sphere gap switch 4 conductings that make to light a fire, main capacitance 7 is logical to the electric discharge of reactor test product, is met the exponential oscillation decaying wave of standard-required.
The 35kV reactor test product of take is example, master gauge fixes on the interior exponential oscillation decaying wave that reactor test product is applied to 3000 160kV of time of 1min, and within the time of one minute 3000 power cycles just, so control thinking and be the specific works process that in each power cycle main capacitance 7 completes a charge and discharge process, be, after receiving control signal, DC high-voltage power supply 3 exports 160kV voltage, fire sphere gap switch 4 in reference mark, in off-state, gives main capacitance 7 chargings by DC high-voltage power supply 3 simultaneously; At DC high-voltage power supply 3 Non voltage outputs, by control box, make ignition pill gap switch conduction, the logical 7 pairs of reactor test products of main capacitance discharge, and are met the exponential oscillation decaying wave of standard-required.
Embodiment two: present embodiment is described referring to Fig. 1, the difference of the portable dry type air reactor turn-to-turn insulation impulse hunting test unit described in present embodiment and embodiment one is, described energy storage and voltage measuring apparatus 9 comprise resitstance voltage divider 6, main capacitance 7 and capacitive divider 8, the DC voltage output end of described resitstance voltage divider 6 is for output dc voltage, described resitstance voltage divider 6 electric signal input ends are connected with the other end of damping resistance 5, the electrical signal of resitstance voltage divider 6 is connected with one end of main capacitance 7, the high pressure ground end of resitstance voltage divider 6 is connected with the high pressure ground end of capacitive divider 8, the other end of described main capacitance 7 is connected with the electric signal input end of capacitive divider 8, the first electrical signal of described capacitive divider 8 is connected with the electric signal input end of oscillograph 2, the second electrical signal of capacitive divider 8 is connected with one end of reactor test product, the 3rd electrical signal of capacitive divider 8 is connected with the other end of reactor test product,
The high pressure ground end that the high pressure ground end of described resitstance voltage divider 6 is energy storage and voltage measuring apparatus 9;
Described resitstance voltage divider 6 electric signal input ends are the electric signal input end of energy storage and voltage measuring apparatus 9;
The first electrical signal of described capacitive divider 8 is the first electrical signal of energy storage and voltage measuring apparatus 9;
The second electrical signal of capacitive divider 8 is the second electrical signal of energy storage and voltage measuring apparatus 9;
The 3rd electrical signal of capacitive divider 8 is the 3rd electrical signal of energy storage and voltage measuring apparatus 9.
In present embodiment, the DC voltage output end output dc voltage of described resitstance voltage divider 6 is for detection of the output voltage of DC high-voltage power supply 3.
Embodiment three: referring to Fig. 1, present embodiment is described, the difference of the portable dry type air reactor turn-to-turn insulation impulse hunting test unit described in present embodiment and embodiment one or two is, described N is greater than 4 and be less than 10 integer.
Embodiment four: present embodiment is described referring to Fig. 1, the difference of the portable dry type air reactor turn-to-turn insulation impulse hunting test unit described in present embodiment and embodiment one or two is, described igniting sphere gap switch 4 is encapsulated in housing, and this housing bottom is provided with castor.
Embodiment five: present embodiment is described referring to Fig. 1, the difference of the portable dry type air reactor turn-to-turn insulation impulse hunting test unit described in present embodiment and embodiment four is, described pressure regulator 1 is with shell, and this outer casing bottom is provided with castor.
Embodiment six: present embodiment is described referring to Fig. 1, the difference of the portable dry type air reactor turn-to-turn insulation impulse hunting test unit described in present embodiment and embodiment three is, the length of described casing is X centimetre, wide is Y centimetre, height is Z centimetre, and the scope of X for be greater than 150 and the scope that is less than 180, Y for be greater than 40 and the scope that is less than 60, Z for being greater than 130 and be less than 160.
Claims (6)
1. portable dry type air reactor turn-to-turn insulation impulse hunting test unit, it is characterized in that, it comprises pressure regulator (1), oscillograph (2), DC high-voltage power supply (3), igniting sphere gap switch (4), damping resistance (5), energy storage and voltage measuring apparatus (9) and casing;
The voltage signal input end of described pressure regulator (1) is used for receiving electric signal, the control signal input end of this pressure regulator (1) is for reception control signal, the electrical signal of pressure regulator (1) is connected with the electric signal input end of DC high-voltage power supply (3), the ground connection termination the earth of pressure regulator (1), the electric signal input end of described oscillograph (2) is connected with the first electrical signal of voltage measuring apparatus (9) with energy storage, the high pressure ground end of described DC high-voltage power supply (3), the first output terminal of DC high-voltage power supply (3), the high pressure ground end of the high pressure ground end of igniting sphere gap switch (4) and energy storage and voltage measuring apparatus (9) connects the earth simultaneously, the high-voltage signal output terminal of described DC high-voltage power supply (3) is connected with the high-voltage signal input end of igniting sphere gap switch (4), the control signal input end of igniting sphere gap switch (4) is used for receiving control ball gap signal, the electrical signal of igniting sphere gap switch (4) is connected with one end of damping resistance (5), the other end of damping resistance (5) is connected with the electric signal input end of voltage measuring apparatus (9) with energy storage, the second electrical signal of energy storage and voltage measuring apparatus (9) is for one end of linked reactor test product, the 3rd electrical signal of energy storage and voltage measuring apparatus (9) is for the other end of linked reactor test product,
Described energy storage and voltage measuring apparatus (9) are placed in casing, and the bottom of casing is provided with N wheel, and described N is more than or equal to 4 integer.
2. portable dry type air reactor turn-to-turn insulation impulse hunting test unit according to claim 1, it is characterized in that, described energy storage and voltage measuring apparatus (9) comprise resitstance voltage divider (6), main capacitance (7) and capacitive divider (8), the DC voltage output end of described resitstance voltage divider (6) is for output dc voltage, described resitstance voltage divider (6) electric signal input end is connected with the other end of damping resistance (5), the electrical signal of resitstance voltage divider (6) is connected with one end of main capacitance (7), the high pressure ground end of resitstance voltage divider (6) is connected with the high pressure ground end of capacitive divider (8), the other end of described main capacitance (7) is connected with the electric signal input end of capacitive divider (8), the first electrical signal of described capacitive divider (8) is connected with the electric signal input end of oscillograph (2), the second electrical signal of capacitive divider (8) is connected with one end of reactor test product, the 3rd electrical signal of capacitive divider (8) is connected with the other end of reactor test product,
The high pressure ground end that the high pressure ground end of described resitstance voltage divider (6) is energy storage and voltage measuring apparatus (9);
Described resitstance voltage divider (6) electric signal input end is the electric signal input end of energy storage and voltage measuring apparatus (9);
The first electrical signal of described capacitive divider (8) is the first electrical signal of energy storage and voltage measuring apparatus (9);
The second electrical signal of capacitive divider (8) is the second electrical signal of energy storage and voltage measuring apparatus (9);
The 3rd electrical signal of capacitive divider (8) is the 3rd electrical signal of energy storage and voltage measuring apparatus (9).
3. portable dry type air reactor turn-to-turn insulation impulse hunting test unit according to claim 1 and 2, is characterized in that, described N is greater than 4 and be less than 10 integer.
4. portable dry type air reactor turn-to-turn insulation impulse hunting test unit according to claim 1 and 2, is characterized in that, described igniting sphere gap switch (4) is encapsulated in housing, and this housing bottom is provided with castor.
5. portable dry type air reactor turn-to-turn insulation impulse hunting test unit according to claim 4, is characterized in that, described pressure regulator (1) is with shell, and this outer casing bottom is provided with castor.
6. portable dry type air reactor turn-to-turn insulation impulse hunting test unit according to claim 3, it is characterized in that, the length of described casing is X centimetre, wide is Y centimetre, height is Z centimetre, and the scope of X for be greater than 150 and the scope that is less than 180, Y for be greater than 40 and the scope that is less than 60, Z for being greater than 130 and be less than 160.
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|---|---|---|---|
| CN201320687491.2U CN203519773U (en) | 2013-11-01 | 2013-11-01 | Portable dry-type air-core reactor turn-to-turn insulation pulse vibration test device |
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| CN201320687491.2U CN203519773U (en) | 2013-11-01 | 2013-11-01 | Portable dry-type air-core reactor turn-to-turn insulation pulse vibration test device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237582A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Oscillatory wave generation system and method and partial discharge detection system and method |
| CN105259488A (en) * | 2015-11-26 | 2016-01-20 | 云南电网有限责任公司电力科学研究院 | 500kV high-voltage parallel electric reactor turn-to-turn insulation performance testing platform |
| CN105675933A (en) * | 2016-01-25 | 2016-06-15 | 国网浙江省电力公司嘉兴供电公司 | Ignition circuit of controllable discharge sphere gap in reactor inter-turn insulation detector |
| CN105738776A (en) * | 2014-12-08 | 2016-07-06 | 华北电力科学研究院有限责任公司 | Detection system and method of turn-to-turn defects of series reactor |
| CN105974290A (en) * | 2016-07-22 | 2016-09-28 | 国网河南省电力公司电力科学研究院 | Dry type air reactor turn-to-turn insulation performance detection system and method |
| CN106501696A (en) * | 2016-10-19 | 2017-03-15 | 云南电网有限责任公司电力科学研究院 | A kind of 500kV high-voltage shunt reactors scene local discharge test system and method |
| CN106646155A (en) * | 2016-11-24 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Small-capacity 35kV dry type hollow parallel reactor interturn voltage-withstand test circuit |
| CN109375078A (en) * | 2018-11-30 | 2019-02-22 | 中国电力科学研究院有限公司 | It is a kind of for detecting the system and method for dry-type reactor interturn insulation |
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2013
- 2013-11-01 CN CN201320687491.2U patent/CN203519773U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237582A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Oscillatory wave generation system and method and partial discharge detection system and method |
| CN105738776A (en) * | 2014-12-08 | 2016-07-06 | 华北电力科学研究院有限责任公司 | Detection system and method of turn-to-turn defects of series reactor |
| CN105738776B (en) * | 2014-12-08 | 2018-09-07 | 华北电力科学研究院有限责任公司 | A kind of detecting system and method for current-limiting reactor turn-to-turn defect |
| CN105259488A (en) * | 2015-11-26 | 2016-01-20 | 云南电网有限责任公司电力科学研究院 | 500kV high-voltage parallel electric reactor turn-to-turn insulation performance testing platform |
| CN105675933A (en) * | 2016-01-25 | 2016-06-15 | 国网浙江省电力公司嘉兴供电公司 | Ignition circuit of controllable discharge sphere gap in reactor inter-turn insulation detector |
| CN105675933B (en) * | 2016-01-25 | 2019-06-04 | 国网浙江省电力公司嘉兴供电公司 | The firing circuit of controlled discharge ball gap in reactor turn to turn insulation test device |
| CN105974290A (en) * | 2016-07-22 | 2016-09-28 | 国网河南省电力公司电力科学研究院 | Dry type air reactor turn-to-turn insulation performance detection system and method |
| CN105974290B (en) * | 2016-07-22 | 2018-12-04 | 国网河南省电力公司电力科学研究院 | A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method |
| CN106501696A (en) * | 2016-10-19 | 2017-03-15 | 云南电网有限责任公司电力科学研究院 | A kind of 500kV high-voltage shunt reactors scene local discharge test system and method |
| CN106646155A (en) * | 2016-11-24 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Small-capacity 35kV dry type hollow parallel reactor interturn voltage-withstand test circuit |
| CN109375078A (en) * | 2018-11-30 | 2019-02-22 | 中国电力科学研究院有限公司 | It is a kind of for detecting the system and method for dry-type reactor interturn insulation |
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Granted publication date: 20140402 |
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| CX01 | Expiry of patent term |