CN107991592A - Partial discharge of switchgear test platform and test method - Google Patents
Partial discharge of switchgear test platform and test method Download PDFInfo
- Publication number
- CN107991592A CN107991592A CN201711280424.8A CN201711280424A CN107991592A CN 107991592 A CN107991592 A CN 107991592A CN 201711280424 A CN201711280424 A CN 201711280424A CN 107991592 A CN107991592 A CN 107991592A
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- switchgear
- partial discharge
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- test
- pressure regulator
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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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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of partial discharge of switchgear test platform and test method, is related to shelf depreciation testing field, including：Power supply；Pressure regulator, it is connected with the power supply；Double shield isolating transformer, it is connected with the pressure regulator, and the double shield isolating transformer is used to supply voltage being depressured to consistent with the primary voltage of the pressure regulator；Full-shield room, it is used to house the switchgear；Cable termination, its one end are arranged in the full-shield room, and the other end is located at outside the full-shield room and is connected with the double shield isolating transformer, and instrument for measuring partial discharge, it is used for the partial discharge quantity for testing the switchgear.Partial discharge of switchgear test platform in the present invention more accurately can carry out shelf depreciation test to switchgear.
Description
Technical field
The present invention relates to shelf depreciation testing field, and in particular to a kind of partial discharge of switchgear test platform and test side
Method.
Background technology
In having the solid dielectric of gas or liquid, when the gas of disruptive field intensity or the local field strength of liquid reach it and hits
When wearing field strength, this portion gas or liquid start to discharge.Shelf depreciation is typically due to inside insulator or insulating surface is local
Caused by electric field is especially concentrated.Usually this electric discharge shows as the pulse for the duration being less than lus.
It is this to discharge only to cause the insulation part short circuit between conductor to be limited without forming conductive channel.It is local each time to put
Electricity can all have dielectric some influences, and influence of the slight shelf depreciation to Electric Power Equipment Insulation is smaller, dielectric strength
Decline slower；And strong shelf depreciation, then dielectric strength can be made to decline quickly.This is high-tension electricity equipment (for example is switched
Cabinet) insulation damages a key factor.Therefore, when design high-tension electricity is apparatus insulated, based on the work in long-term work voltage
Consideration under, does not allow stronger shelf depreciation occurs in insulation system.Therefore need at present one kind can to switchgear into
The platform and method of row shelf depreciation test.
The content of the invention
For defect existing in the prior art, it is an object of the invention to provide one kind more accurately to carry out switchgear
The platform of shelf depreciation test.
To achieve the above objectives, the present invention adopts the technical scheme that：
A kind of partial discharge of switchgear test platform, including：
Power supply；
Pressure regulator, it is connected with the power supply；
Double shield isolating transformer, it is connected with the pressure regulator, and the double shield isolating transformer is used for power supply electricity
Pressure drop is pressed onto consistent with the primary voltage of the pressure regulator；
Full-shield room, it is used to house the switchgear；
Cable termination, its one end are arranged in the full-shield room, the other end be located at outside the full-shield room and with it is described
Double shield isolating transformer is connected, and
Instrument for measuring partial discharge, it is used for the partial discharge quantity for testing the switchgear.
Based on the above technical solutions, the partial discharge of switchgear test platform further includes line filter, institute
State line filter one end with the pressure regulator to be connected, the other end is connected with the double shield isolating transformer.
Based on the above technical solutions, the partial discharge of switchgear test platform further includes HT testing transformer
And high voltage filter, described HT testing transformer one end are connected with the power supply, the other end is connected with the high voltage filter,
The high voltage filter is also connected with the pressure regulator.
Based on the above technical solutions, the power supply is series resonant inverter.
Based on the above technical solutions, the partial discharge of switchgear test platform further includes calibrator, the school
Quasi- device is used to calibrate the instrument for measuring partial discharge.
It is another object of the present invention to provide a kind of method that shelf depreciation test can be more accurately carried out to switchgear.
To achieve the above objectives, the present invention adopts the technical scheme that：
A kind of method using above-mentioned partial discharge of switchgear test platform test partial discharge of switchgear, this method include
Following steps：
S1. full-shield room is inserted after switchgear is closed and is connected with cable termination；
S2. one in the three-phase of switchgear is connected high pressure, in addition two phase ground；
S3. gradually boosted by pressure regulator, apply voltage U until reaching pre-, and kept for 10 seconds；
S4. voltage is dropped to by First partial discharge test voltage by pressure regulator, and is kept for 30 seconds, then using local
Discharge tester tests the partial discharge value of switchgear, judges whether partial discharge value is less than 20pc, if so, step S5 is then performed, if it is not, then
Switchgear is overhauled or is replaced；
S5. voltage is dropped to by the second local discharge test voltage by pressure regulator, and is kept for 30 seconds, then using local
Discharge tester tests the partial discharge value of switchgear, judges whether partial discharge value is less than 3pc, if so, step S6 is then performed, if it is not, then
Switchgear is overhauled or is replaced；
S6. voltage is dropped to by 0V by pressure regulator；
S7. repeat step S2 to S6, completes the test of other two-phase, terminates.
Based on the above technical solutions, the pre- voltage of applying is 1.3Un, First partial discharge test voltage is
1.1Un, the second local discharge test voltage isWherein Un is the load voltage value of switchgear.
Based on the above technical solutions, in step S3, boosted to after voltage reaches 75%U with the speed of 2%U/S
Apply voltage U in advance.
Compared with prior art, the advantage of the invention is that：
The partial discharge of switchgear test platform of the present invention includes double shield isolating transformer, full-shield room, line filter
Device and high voltage filter.Wherein, line filter and high voltage filter can suppress the interference of electric power network, double shield isolation
Transformer can prevent the interference ripple of power supply from being immersed by the stray capacitance between primary and secondary winding.Full-shield room can be with
Spatial electromagnetic wave screen is covered, prevents radiation interference.After above-mentioned measure is taken, the present invention can be more accurately to switchgear carry out office
The platform of portion's discharge test.
Brief description of the drawings
Fig. 1 is the flow chart of test method in the present invention.
Embodiment
The present invention is described in further detail below in conjunction with attached drawing.
The present invention provides a kind of partial discharge of switchgear test platform, it includes power supply, pressure regulator, double shield isolation transformation
Device, full-shield room, cable termination and instrument for measuring partial discharge.
Wherein, power supply is series resonant inverter, and it is according to electric wire, electric capacitor etc. that series resonance, which produces test voltage,
Product has the characteristics that what larger capacitance designed.
Pressure regulator, it is connected with power supply, it is mainly used for the voltage that adjustment is added on switchgear.
Partial discharge of switchgear test platform in the present invention further includes HT testing transformer and high voltage filter, high pressure
Testing transformer one end is connected with power supply, and the other end is connected with high voltage filter, and high voltage filter is also connected with pressure regulator.
High voltage filter will further suppress the interference entered from power supply and HT testing transformer shelf depreciation itself
The interference of generation.Meanwhile measure loop is kept apart with high voltage reactor branch, improve detection sensitivity.In addition also can use
To help to search the position discharged under high potential.
Double shield isolating transformer, it is connected with pressure regulator, and double shield isolating transformer is used to supply voltage being depressured to
It is consistent with the primary voltage of pressure regulator.Each own thin copper metal plate shielding of primary and secondary winding of double shield isolating transformer,
And there is insulation isolation structure to make mutual stray capacitance as small as possible between secondary winding and iron core, to prevent power supply
Interference ripple immersed by stray capacitance between primary and secondary winding.General double shield isolating transformer has more than 20dB
Suppression interference effect.
Partial discharge of switchgear test platform in the present invention further includes line filter, line filter one end and pressure regulation
Device is connected, and the other end is connected with double shield isolating transformer.The major function of line filter is also to suppress electric power network
Interference, commonly uses bamboo type Structure Filter.General line filter, which has, decays the interference filter in the range of 10kHz-1MHz
Ability minimum value reaches more than 40dB.
Full-shield room, it is used to house switchgear.Full-shield room is a kind of measure, and screened room is made of steel plate.It is main to make
With being to cover spatial electromagnetic wave screen, radiation interference is prevented.The typical arrangement in full-shield room is will to be placed on production line same in examination area
In one workshop.Interconnected system is extruded when cable core passes through, and after shielding, stranding, sheath manufacture craft, you can with driving handling
Prepare experiment to examination area's stripping test terminal.Progress Partial Discharge Detection can run into many great electromagnetism and do in this environment
Disturb：Such as various heavy-duty motor, driving, arc lamp and protective relaying devices.Various interference are likely to form spatial electromagnetic ripple
Directly it is radiated in test loop, or is closed from electric power incoming line and entered by transformer induction lotus root, it is also possible to is coupled to by electrostatic
On concrete floor bar-mat reinforcement, examination area underground is directly transferred to through reinforcing bar, again is coupled in test loop.Full-shield room is its main feature is that examination
Test area isolate with factory terrace mutually insulated, single-point grounding, electromagnetic shielding, power filter and equipment discharge off etc..
Cable termination, its one end are arranged in full-shield room, the other end be located at outside full-shield room and with the double shield every
It is connected from transformer.When carrying out partial discharge test, local put must not occur under test voltage for used cable termination
Electricity.Because existing frequently-used is mostly direct method measure loop, if there occurs shelf depreciation (no matter inside insulator on cable termination
Or along face), often with being measured as on cable occurring, and also relatively it is difficult to differentiate in waveform characteristic.So reliable side
Method is the cable termination using no shelf depreciation.
Instrument for measuring partial discharge, it is used for the shelf depreciation for testing switchgear.Instrument for measuring partial discharge in the present invention can
To be ICM compact PD testers.
In addition, the partial discharge of switchgear test platform in the present invention is also equipped with calibrator periodically to instrument for measuring partial discharge
Calibrated, to ensure the accurate of test.The voltage pulse rise time tr of calibrator<60ns, calibrates rated value error<+/-
5% or<+/- lpc (skin coulomb).
Shown in Figure 1, the present invention also provides one kind to utilize above-mentioned partial discharge of switchgear test platform test switchgear
The method of shelf depreciation, this method comprise the following steps：
S1. full-shield room is inserted after switchgear is closed and is connected with cable termination；
S2. one in the three-phase of switchgear is connected high pressure, in addition two phase ground；
S3. gradually boosted by pressure regulator, apply voltage U until reaching pre-, and kept for 10 seconds；
, should be since sufficiently low numerical value, to prevent caused by operation transient process when applying voltage to switchgear
The influence of overvoltage, then should slowly raise voltage, but can not rise too slow, in order to avoid cause to apply voltage U's in advance close
Pressure-resistant time is long.Boosted in the present invention after voltage reaches 75%U with the speed of 2%U/S and pre- apply voltage U.
S4. voltage is dropped to by First partial discharge test voltage by pressure regulator, and is kept for 30 seconds, then using local
Discharge tester tests the partial discharge value of switchgear, judges whether partial discharge value is less than 20pc, if so, step S5 is then performed, if it is not, then
Switchgear is overhauled or is replaced；
Applying voltage U in advance should be kept for the stipulated time, then rapid decompression, but cannot sudden shut off, in order to avoid it is likely to occur transition
Process and cause failure or cause incorrect test result.
S5. voltage is dropped to by the second local discharge test voltage by pressure regulator, and is kept for 30 seconds, then using local
Discharge tester tests the partial discharge value of switchgear, judges whether partial discharge value is less than 3pc, if so, step S6 is then performed, if it is not, then
Switchgear is overhauled or is replaced；
It is 1.3U to apply voltage in the present invention in advancen, First partial discharge test voltage is 1.1Un, the second local discharge test electricity
Press and beWherein UnFor the load voltage value of switchgear.
S6. voltage is dropped to by 0V by pressure regulator；
S7. repeat step S2 to S6, completes the test of other two-phase, terminates.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to the prior art known to professional and technical personnel in the field.
Claims (8)
- A kind of 1. partial discharge of switchgear test platform, it is characterised in that including：Power supply；Pressure regulator, it is connected with the power supply；Double shield isolating transformer, it is connected with the pressure regulator, and the double shield isolating transformer is used to drop supply voltage It is pressed onto consistent with the primary voltage of the pressure regulator；Full-shield room, it is used to house the switchgear；Cable termination, its one end are arranged in the full-shield room, the other end be located at outside the full-shield room and with the double screen Isolating transformer is covered to be connected, andInstrument for measuring partial discharge, it is used for the partial discharge quantity for testing the switchgear.
- 2. partial discharge of switchgear test platform as claimed in claim 1, it is characterised in that：The partial discharge of switchgear is surveyed Examination platform further includes line filter, and described line filter one end is connected with the pressure regulator, the other end and the double shield Isolating transformer is connected.
- 3. partial discharge of switchgear test platform as claimed in claim 1, it is characterised in that：The partial discharge of switchgear is surveyed Examination platform further includes HT testing transformer and high voltage filter, and described HT testing transformer one end is connected with the power supply, The other end is connected with the high voltage filter, and the high voltage filter is also connected with the pressure regulator.
- 4. partial discharge of switchgear test platform as claimed in claim 1, it is characterised in that：The power supply is series resonance electricity Source.
- 5. partial discharge of switchgear test platform as claimed in claim 1, it is characterised in that：The partial discharge of switchgear is surveyed Examination platform further includes calibrator, and the calibrator is used to calibrate the instrument for measuring partial discharge.
- 6. a kind of method of partial discharge of switchgear test platform test partial discharge of switchgear using described in claim 1, It is characterized in that, this method comprises the following steps：S1. full-shield room is inserted after switchgear is closed and is connected with cable termination；S2. one in the three-phase of switchgear is connected high pressure, in addition two phase ground；S3. gradually boosted by pressure regulator, apply voltage U until reaching pre-, and kept for 10 seconds；S4. voltage is dropped to by First partial discharge test voltage by pressure regulator, and is kept for 30 seconds, then utilize shelf depreciation Tester tests the partial discharge value of switchgear, judges whether partial discharge value is less than 20pc, if so, step S5 is then performed, if it is not, then split Cabinet is closed to be overhauled or replaced；S5. voltage is dropped to by the second local discharge test voltage by pressure regulator, and is kept for 30 seconds, then utilize shelf depreciation Tester tests the partial discharge value of switchgear, judges whether partial discharge value is less than 3pc, if so, step S6 is then performed, if it is not, then split Cabinet is closed to be overhauled or replaced；S6. voltage is dropped to by 0V by pressure regulator；S7. repeat step S2 to S6, completes the test of other two-phase, terminates.
- 7. method as claimed in claim 6, it is characterised in that：The pre- voltage of applying is 1.3Un, First partial discharge test electricity Press as 1.1Un, the second local discharge test voltage isWherein UnFor the load voltage value of switchgear.
- 8. method as claimed in claim 6, it is characterised in that：In step S3, with the speed of 2%U/S after voltage reaches 75%U Rate, which boosts to, pre- applies voltage U.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711280424.8A CN107991592A (en) | 2017-11-27 | 2017-11-27 | Partial discharge of switchgear test platform and test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711280424.8A CN107991592A (en) | 2017-11-27 | 2017-11-27 | Partial discharge of switchgear test platform and test method |
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| CN107991592A true CN107991592A (en) | 2018-05-04 |
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| CN201711280424.8A Pending CN107991592A (en) | 2017-11-27 | 2017-11-27 | Partial discharge of switchgear test platform and test method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646158A (en) * | 2018-08-16 | 2018-10-12 | 国网山西省电力公司临汾供电公司 | Partial discharge detecting system for the experiment of high-tension switch cabinet ac voltage withstanding |
| CN109507555A (en) * | 2018-12-27 | 2019-03-22 | 益和电气集团股份有限公司 | A kind of partial discharge test system and test method |
| CN109541360A (en) * | 2018-12-27 | 2019-03-29 | 益和电气集团股份有限公司 | A kind of ring network cabinet assembly line |
| CN111880059A (en) * | 2020-07-31 | 2020-11-03 | 国网重庆市电力公司电力科学研究院 | Partial discharge test platform and method for high-voltage switch cabinet insulating part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108646158A (en) * | 2018-08-16 | 2018-10-12 | 国网山西省电力公司临汾供电公司 | Partial discharge detecting system for the experiment of high-tension switch cabinet ac voltage withstanding |
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| CN109541360A (en) * | 2018-12-27 | 2019-03-29 | 益和电气集团股份有限公司 | A kind of ring network cabinet assembly line |
| CN111880059A (en) * | 2020-07-31 | 2020-11-03 | 国网重庆市电力公司电力科学研究院 | Partial discharge test platform and method for high-voltage switch cabinet insulating part |
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