CN109738769A - A kind of pressurizing device of the current transformer local discharge test based on series resonance - Google Patents
A kind of pressurizing device of the current transformer local discharge test based on series resonance Download PDFInfo
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- CN109738769A CN109738769A CN201910011673.XA CN201910011673A CN109738769A CN 109738769 A CN109738769 A CN 109738769A CN 201910011673 A CN201910011673 A CN 201910011673A CN 109738769 A CN109738769 A CN 109738769A
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- partial discharge
- current transformer
- pressurizing device
- series resonance
- discharge test
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Abstract
A kind of pressurizing device of current transformer local discharge test based on series resonance proposed by the present invention, comprising: no partial discharge frequency conversion power cabinet, without partial discharge exciting transformer, resonance reactance and capacitive divider；Secondary side one end of no partial discharge exciting transformer is grounded, and the other end is grounded after resonance reactance and capacitive divider is connected in series；Respectively as HV Terminal and ground terminal, HV Terminal is used to connect the first winding after subject current transformer is shorted at the both ends of capacitive divider, and ground terminal is used to connect the secondary winding after subject current transformer is shorted.In the present invention, pass through the series resonance reactance in subject current transformer local discharge test circuit, resonant tank is constituted to boost, current transformer local discharge test is reduced to no partial discharge frequency conversion power cabinet and the demand of the large capacity without partial discharge exciting transformer, advantageously reduces current transformer local discharge test to no partial discharge frequency conversion power cabinet and without the selection cost of partial discharge exciting transformer.
Description
Technical field
The present invention relates to pressure build-up technique field more particularly to a kind of current transformer local discharge tests based on series resonance
Pressurizing device.
Background technique
The number of components of the pressurizing device of present current transformer local discharge test is more, cost is high, weight is heavy, volume is big,
The problem of taking up a large area, and will cause the large labor intensity of testing crew, is also unable to satisfy that field test capacity is big, voltage
The high demand of grade.
Summary of the invention
Technical problems based on background technology, the Current Mutual Inductance general ability based on series resonance that the invention proposes a kind of
Put the pressurizing device of test.
The pressurizing device of a kind of current transformer local discharge test based on series resonance proposed by the present invention, comprising: without office
Put variable-frequency power sources cabinet, without partial discharge exciting transformer, resonance reactance and capacitive divider；
The input terminal of no partial discharge frequency conversion power cabinet accesses AC three-phase working power, the single-phase electricity of no partial discharge frequency conversion power cabinet
Source output terminal connects the primary side without partial discharge exciting transformer；Secondary side one end of no partial discharge exciting transformer is grounded, the other end
It is grounded after resonance reactance and capacitive divider is connected in series；
Respectively as HV Terminal and ground terminal, HV Terminal is mutual for connecting subject electric current at the both ends of capacitive divider
Sensor be shorted after first winding, ground terminal is used to connect the secondary winding after subject current transformer short circuit, when test, quilt
It is in parallel with capacitive divider to try current transformer.
Preferably, no partial discharge frequency conversion power cabinet output voltage is 0~350V.
Preferably, no partial discharge frequency conversion power cabinet input voltage is 380V, and output voltage is 0~350V.
Preferably, it is 50kVA without partial discharge exciting transformer that no partial discharge exciting transformer, which uses rated capacity,.
Preferably, no partial discharge exciting transformer primary side input voltage be 0~350V, secondary side output voltage be 0~
12.5kV。
Preferably, the frequency of no partial discharge exciting transformer secondary side output voltage is 0Hz~100Hz.
Preferably, resonance reactance is used is connected the current-limiting reactor formed by more piece reactor.
Preferably, resonance reactance is made of two section reactors, and the voltage rating of single-unit reactor is 250kV, rated current
For 1A.
Preferably, capacitive divider uses the capacitor of 3000pF.
Preferably, capacitive divider is composed in series by two capacitors.
A kind of pressurizing device of current transformer local discharge test based on series resonance proposed by the present invention is applied to electric current
When mutual inductor local discharge test, by no partial discharge frequency conversion power cabinet and the application without partial discharge exciting transformer, it is suppressed that power supply power supply
Interference in network；Then, it is connected to the capacitor of secondary winding with resonance reactor by being tested current transformer first winding
Resonant excitation resonant tank boosts.
In the present invention, by the series resonance reactance in subject current transformer local discharge test circuit, resonant tank is constituted
It boosts, reduces current transformer local discharge test to no partial discharge frequency conversion power cabinet and large capacity without partial discharge exciting transformer
Demand reduces no partial discharge frequency conversion power cabinet and capacity, weight and volume without partial discharge exciting transformer, advantageously reduces electric current
Mutual inductor local discharge test is to no partial discharge frequency conversion power cabinet and without the selection cost of partial discharge exciting transformer.
Meanwhile in the present invention, is boosted by resonant tank, simplified the composition of partial discharge circuit, reduced circuit
Component number reduces the volume and weight of hookup, and the area of occupancy is smaller, convenient transportation.And adding in the present invention
Pressure device, in-site installation is convenient, flexible, safe and reliable, light, substantially reduces test labor intensity, is conducive to improve test
Efficiency.
Detailed description of the invention
Fig. 1 is that a kind of pressurizing device circuit of current transformer local discharge test based on series resonance proposed by the present invention is former
Reason figure.
Specific embodiment
Referring to Fig.1, the pressurizing device of a kind of current transformer local discharge test based on series resonance proposed by the present invention, packet
It includes: no partial discharge frequency conversion power cabinet 1, without partial discharge exciting transformer 2, resonance reactance 3 and capacitive divider 4.
The input terminal of no partial discharge frequency conversion power cabinet 1 accesses AC three-phase working power, no partial discharge frequency conversion power cabinet 1 it is single-phase
Power output end connects the primary side without partial discharge exciting transformer 2.Secondary side one end of no partial discharge exciting transformer 2 is grounded, separately
One end is grounded after resonance reactance 3 and capacitive divider 4 is connected in series.
It is short to be tested 5 first winding of current transformer respectively as HV Terminal and ground terminal for the both ends of capacitive divider 4
Connect with 4 HV Terminal of capacitive divider after connecing, after 5 secondary winding of current transformer short circuit with 4 ground terminal of capacitive divider
Connection, in this way, realizing subject current transformer 5 access pressurization circuit in parallel with capacitive divider 4.
In this way, in present embodiment, by no partial discharge frequency conversion power cabinet and the application without partial discharge exciting transformer, it is suppressed that
Interference in power supply power supply network；Then, the capacitor by examination 5 first winding of current transformer to secondary winding and resonance reactance
3 series resonance of device excitation resonant tank boosts.
In this way, passing through the series resonance reactance 3 in subject 5 local discharge test circuit of current transformer, structure in present embodiment
It boosts at resonant tank, reduces by 5 local discharge test of current transformer to no partial discharge frequency conversion power cabinet and without partial discharge excitation transformation
The demand of the large capacity of device reduces no partial discharge frequency conversion power cabinet and capacity, weight and volume without partial discharge exciting transformer, has
Conducive to reduction current transformer local discharge test to no partial discharge frequency conversion power cabinet and without the selection cost of partial discharge exciting transformer.
Meanwhile in present embodiment, boosted by resonant tank, has simplified the composition of partial discharge circuit, reduced
Circuit components quantity reduces the volume and weight of hookup, and the area of occupancy is smaller, convenient transportation.And this implementation mentions
The pressurizing device of confession, in-site installation is convenient, flexible, safe and reliable, light, substantially reduces test labor intensity, is conducive to mention
High test efficiency.
Specifically, in present embodiment, according to the specification of subject current transformer 5 and test demand, no partial discharge frequency conversion electricity
Cabinet 1 input voltage in source is 380V, and output voltage is 0~350V.
In present embodiment, resonance reactance 3 is connected the current-limiting reactor formed using by more piece reactor, so as to according to examination
Demand is tested, adjusts 3 parameter of resonance reactance by adjusting concatenated reactor quantity, that is, improves the flexible of resonance reactance work
Property, and be conducive to expand the range of choice of reactor, reduce cost needs.
When it is implemented, the application of capacitive divider 4 has taken into account coupling and partial pressure.In present embodiment, capacitive divider
It is composed in series by two capacitors.
Specifically, it is 50kVA without partial discharge excitation that no partial discharge exciting transformer 2, which uses rated capacity, in present embodiment
Transformer.No 2 primary side input voltage of partial discharge exciting transformer is 0~350V, and secondary side output voltage is 0~12.5kV.Tool
Body, the frequency of no 2 secondary side output voltage of partial discharge exciting transformer is 0Hz~100Hz.In present embodiment, resonance reactance 3
It is made of two section reactors, the voltage rating of single-unit reactor is 250kV, rated current 1A.Capacitive divider 4 uses
The capacitor of 3000pF.
The pressurizing device for the current transformer local discharge test based on series resonance that present embodiment provides is applied to partial discharge
When test, the background partial discharge amount of a whole set of pressurizing device is less than 2pC.
Specifically, it is mutual to carry out electric current by the pressurizing device of the above-mentioned current transformer local discharge test based on series resonance
The method and step of sensor local discharge test is as follows:
Firstly, subject current transformer to be accessed to the pressurizing device of above-mentioned current transformer local discharge test.That is, subject electricity
5 first winding of current transformer be shorted after connect with 4 HV Terminal of capacitive divider, 5 secondary winding of current transformer be shorted after and
The connection of 4 ground terminal of capacitive divider, subject current transformer 5 is in parallel with capacitive divider 4.
Then, resonance frequency is calculated according to resonance reactance value and resonance capacitance.In this step, resonance reactance value is resonance
The reactance parameter of reactance 3, resonant capacitance value are to be tested current transformer first winding to the equivalent capacitance value of secondary winding.
Finally, high pressure is applied to no partial discharge exciting transformer 2 by no partial discharge frequency conversion power cabinet 1, meanwhile, it adjusts without partial discharge
The output frequency of variable-frequency power sources cabinet 1, either automatically or manually pressurizes；By the output electricity of no partial discharge exciting transformer 2 after pressurization
Pressure drop is 0, then terminates to test.
The above, preferable specific embodiment only of the present invention, but protection scope of the present invention not office
Be limited to this, anyone skilled in the art in the technical scope disclosed by the present invention, technology according to the present invention
Scheme and its inventive concept are subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of pressurizing device of the current transformer local discharge test based on series resonance characterized by comprising no partial discharge becomes
Frequency power cabinet (1), without partial discharge exciting transformer (2), resonance reactance (3) and capacitive divider (4)；
The input terminal of no partial discharge frequency conversion power cabinet (1) accesses AC three-phase working power, no partial discharge frequency conversion power cabinet (1) it is single-phase
Power output end connects the primary side without partial discharge exciting transformer (2)；The secondary side one of no partial discharge exciting transformer (2) terminates
Ground, resonance reactance (3) are connected in series in the other end and capacitive divider (4) is grounded afterwards；
Respectively as HV Terminal and ground terminal, HV Terminal is mutual for connecting subject electric current at the both ends of capacitive divider (4)
Sensor be shorted after first winding, ground terminal is used to connect the secondary winding after subject current transformer short circuit, when test, quilt
It is in parallel with capacitive divider to try current transformer.
2. the pressurizing device of the current transformer local discharge test based on series resonance as described in claim 1, which is characterized in that
No partial discharge frequency conversion power cabinet (1) output voltage is 0~350V.
3. the pressurizing device of the current transformer local discharge test based on series resonance as claimed in claim 2, which is characterized in that
No partial discharge frequency conversion power cabinet (1) input voltage is 380V, and output voltage is 0~350V.
4. the pressurizing device of the current transformer local discharge test based on series resonance as described in claim 1, which is characterized in that
It is 50kVA without partial discharge exciting transformer that no partial discharge exciting transformer (2), which uses rated capacity,.
5. the pressurizing device of the current transformer local discharge test based on series resonance as described in claim 1, which is characterized in that
No partial discharge exciting transformer (2) primary side input voltage is 0~350V, and secondary side output voltage is 0~12.5kV.
6. the pressurizing device of the current transformer local discharge test described in claim 5 based on series resonance, which is characterized in that nothing
The frequency of partial discharge exciting transformer (2) secondary side output voltage is 0Hz~100Hz.
7. the pressurizing device of the current transformer local discharge test based on series resonance as described in claim 1, which is characterized in that
Resonance reactance (3) is connected the current-limiting reactor formed using by more piece reactor.
8. the pressurizing device of the current transformer local discharge test based on series resonance as claimed in claim 7, which is characterized in that
Resonance reactance (3) You Liangjie reactor composition, the voltage rating of single-unit reactor are 250kV, rated current 1A.
9. the pressurizing device of the current transformer local discharge test based on series resonance as described in claim 1, which is characterized in that
Capacitive divider (4) uses the capacitor of 3000pF.
10. the pressurizing device of the current transformer local discharge test based on series resonance, feature exist as claimed in claim 9
In capacitive divider is composed in series by two capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910011673.XA CN109738769A (en) | 2019-01-07 | 2019-01-07 | A kind of pressurizing device of the current transformer local discharge test based on series resonance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910011673.XA CN109738769A (en) | 2019-01-07 | 2019-01-07 | A kind of pressurizing device of the current transformer local discharge test based on series resonance |
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| CN109738769A true CN109738769A (en) | 2019-05-10 |
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| CN201910011673.XA Pending CN109738769A (en) | 2019-01-07 | 2019-01-07 | A kind of pressurizing device of the current transformer local discharge test based on series resonance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
| CN112649730A (en) * | 2020-12-04 | 2021-04-13 | 国网新疆电力有限公司电力科学研究院 | Simulated load device and series resonance simulation test system based on same |
-
2019
- 2019-01-07 CN CN201910011673.XA patent/CN109738769A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
| CN112649730A (en) * | 2020-12-04 | 2021-04-13 | 国网新疆电力有限公司电力科学研究院 | Simulated load device and series resonance simulation test system based on same |
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