CN107728031A - A kind of dc circuit breaker is pressure-resistant local discharge test circuit and test method - Google Patents
A kind of dc circuit breaker is pressure-resistant local discharge test circuit and test method Download PDFInfo
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- CN107728031A CN107728031A CN201710681001.0A CN201710681001A CN107728031A CN 107728031 A CN107728031 A CN 107728031A CN 201710681001 A CN201710681001 A CN 201710681001A CN 107728031 A CN107728031 A CN 107728031A
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- circuit breaker
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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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention discloses a kind of pressure-resistant local discharge test circuit of dc circuit breaker and method, wherein circuit to include：Dc source, balancing capacitance, measurement current transform er, partial discharge tester, wherein：Dc source provides electric energy for dc circuit breaker test product to be measured；Balancing capacitance is connected in parallel with dc circuit breaker test product to be measured；Measurement current transform er gathers dc circuit breaker test product and the differential signal of balancing capacitance, is exported after being amplified to differential signal to the partial discharge tester；Partial discharge tester receives the differential signal after amplification, measures the partial discharge quantity of dc circuit breaker test product to be measured.Circuit provided by the invention and method examine dc circuit breaker module is pressure-resistant whether to meet technical requirement on design with partial discharge quantity, so as to the correct reliable apparatus insulated state for judging dc circuit breaker, being capable of the dc circuit breaker semiconductor subassembly form of the composition such as compatible half-bridge, parallel connection, series connection and independent device, it is simple and easy, there is very strong operability.
Description
Technical field
The present invention relates to direct current transportation field, and in particular to a kind of dc circuit breaker is pressure-resistant local discharge test circuit and experiment side
Method.
Background technology
Dc circuit breaker be build direct current network key equipment, quick processing and isolation for DC Line Fault, direct current
The input of current conversion station and excision, have the function that important.Dc circuit breaker is pressure-resistant local discharge test as a kind of nondestructive test,
It is the important method of Insulation monitoring and diagnosis.This is due to that breaker apparatus insulating inner is commonly present some weakness, such as is being poured
Note, extrude or layer easily occurs air gap or bubble around insulating inner.Although discharge energy is very faint, the exhausted in short-term of equipment is not influenceed
Edge intensity, but insulation ag(e)ing will be caused by accumulating over a long period, and may finally cause whole insulation to puncture under normal voltage.Mesh
The preceding test method at home and abroad not yet has related academic research, can reliably judge the apparatus insulated shape of dc circuit breaker
State.
The content of the invention
Therefore, the technical problem to be solved in the present invention is, prior art can not reliably judge setting for dc circuit breaker
Standby state of insulation, to solve the above problems, the present invention provides a kind of dc circuit breaker pipe testing circuit and test method.
The pressure-resistant local discharge test circuit of a kind of dc circuit breaker provided by the invention, including：Dc source, balancing capacitance, survey
Current transformer, partial discharge tester are measured, wherein：The dc source provides electric energy for dc circuit breaker test product to be measured；It is described flat
Weighing apparatus electric capacity is connected in parallel with the dc circuit breaker test product to be measured；The measurement current transform er gathers the dc circuit breaker examination
Product and the differential signal of the balancing capacitance, are exported to the partial discharge tester after being amplified to the differential signal；It is described
Partial discharge tester receives the differential signal after amplification, measures the partial discharge quantity of the dc circuit breaker test product to be measured.
Preferably, the pressure-resistant local discharge test circuit of described dc circuit breaker, in addition to：Current limiting safeguard resistor, the current limliting
Protective resistance is connected in series between the dc source and the dc circuit breaker test product to be measured, to by the direct current interruption
The charging current of device test product is kept within a preset range.
Preferably, the scope of the resistance value of the current limiting safeguard resistor is 100 Ω~2k Ω, and power is 100W~2kW.
Preferably, the dc source includes alternating-current voltage source, bridge rectifier and the electric capacity of voltage regulation being connected in parallel.
Preferably, the scope of the capacitance of the electric capacity of voltage regulation is the μ F of 10 μ F~300.
In order to solve the above problems, the present invention also provides a kind of dc circuit breaker pressure-resistant partial discharge method of testing, including：Pre-
If in the time, the voltage of dc circuit breaker test product to be measured is kept within a preset range；Gather the dc circuit breaker examination to be measured
Differential signal between product and balancing capacitance；The part that the dc circuit breaker test product to be measured is obtained according to the differential signal is put
Electricity.
Preferably, after the differential signal between the dc circuit breaker test product to be measured and balancing capacitance is gathered, basis
Before the differential signal obtains the partial discharge quantity of the dc circuit breaker test product to be measured, in addition to：To the differential signal
It is amplified.
Technical solution of the present invention, have the following advantages that：The semiconductor and its module for forming dc circuit breaker are tested,
Every grade of module is pressure-resistant and whether partial discharge quantity meets technical requirement on design to examine, so as to correctly reliably judge direct current interruption
The apparatus insulated state of device, circuit of the invention and method being capable of the direct current interruptions such as compatible half-bridge, parallel connection, series connection and independent device
The device semiconductor subassembly form of the composition, it is simple and easy, there is very strong operability.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of composition of a specific example of the pressure-resistant local discharge test circuit of dc circuit breaker in the embodiment of the present invention
Figure；
Fig. 2 is a kind of flow of a specific example of the pressure-resistant local discharge test method of dc circuit breaker in the embodiment of the present invention
Figure.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to which explanation, unless otherwise clearly defined and limited, term " connected ", " connects
Connect " it should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or it is integrally connected；It can be machine
Tool connects or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can also be two
The connection of element internal, can be wireless connection or wired connection.For the ordinary skill in the art,
The concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It is be combined with each other into conflict can.
The present embodiment provides a kind of pressure-resistant local discharge test circuit of dc circuit breaker, being capable of compatible full-bridge, half-bridge, parallel connection, string
The dc circuit breaker semiconductor subassembly form of the composition such as connection and independent device, in the present embodiment, is adopted with dc circuit breaker test product
With being illustrated exemplified by full bridge formation, but the present invention is not limited thereto.
As shown in figure 1, the pressure-resistant local discharge test circuit of the dc circuit breaker includes：Dc source 1, balancing capacitance 2, measurement electricity
Current transformer 3, partial discharge tester 4.
Wherein, dc source 1 is that dc circuit breaker test product 5 to be measured provides electric energy.
In the present embodiment, the dc source 1 includes the bridge rectifier 12 of alternating-current voltage source 11, the voltage stabilizing being connected in parallel
Electric capacity 13.After AC power (AC) 11 is by bridge rectifier 12 in the present embodiment, AC power is converted into direct current
Source.In the present embodiment, the scope of the capacitance of electric capacity of voltage regulation 13 is the μ F of 10 μ F~300.
Balancing capacitance 2 is connected in parallel with dc circuit breaker test product 5 to be measured；In test process, the balancing capacitance 2 can be with
Dc circuit breaker test product 5 to be measured forms discharge path.
Measurement current transform er 5 gathers the differential signal of dc circuit breaker test product 5 to be measured and balancing capacitance 2, and difference is believed
Output is to partial discharge tester 4 after number being amplified；Measurement current transform er 3 referred to as measures CT, and in the present embodiment, its primary side is adopted
The differential signal of sample dc circuit breaker test product 5 to be measured and balancing capacitance 2, after secondary amplifies the signal, input to partial discharge and test
Instrument 4.
Partial discharge tester 4 receives the differential signal after amplification, measures the partial discharge quantity of dc circuit breaker test product 5 to be measured.
By the relational expression between electric current and electric charge, the current difference signal of measurement is calculated as electric charge, that is, shelf depreciation
Amount.
In a preferred embodiment, dc circuit breaker is pressure-resistant, and local discharge test circuit also includes：Current limiting safeguard resistor 6, limit
Stream protective resistance 6 is connected in series between dc source 1 and dc circuit breaker test product 5 to be measured, to by dc circuit breaker to be measured
The charging current of test product 5 is kept within a preset range, so as to prevent power supply excessive to the charging current of test product, so as in time to examination
Product fill energy, prevent DC voltage from falling.Preferably, the scope of the resistance value of current limiting safeguard resistor 6 is 100 Ω~2k Ω, power
For 100W~2kW, the preset range that charging current is kept is 0~5A.
During experiment, the dc circuit breaker is pressure-resistant, and local discharge test circuit is needed the safe and reliable ground connection in test product end, is prevented
Only during local discharge test, due to overtension, cause personal electric shock.
The present embodiment also provides a kind of dc circuit breaker pressure-resistant partial discharge method of testing, as shown in Fig. 2 the dc circuit breaker is resistance to
Pressure partial discharge method of testing mainly includes the following steps that：
S1：In preset time, the voltage of dc circuit breaker test product to be measured is kept within a preset range；
S2：Gather the differential signal between dc circuit breaker test product to be measured and balancing capacitance；
S3：The partial discharge quantity of dc circuit breaker test product to be measured is obtained according to differential signal.
In actual applications, during on-test, the voltage of raising direct voltage source progressively, until the voltage reaches pressure-resistant
The required value of local discharge test, the desired partial discharge testing time is kept at this voltage.The required value of pressure-resistant experiment is technology rule
Model requirement, the difference of test product may be variant, and the time is also equally to have differences.Usually, voltage can 2kV~4kV it
Between, the time is between 2min~30min.If test product has shelf depreciation, the discharge pulse can be by between test product and balancing capacitance
Difference, sensed hence into test magnet ring, the differential signal for sensing generation enters partial discharge tester, so as to according to the difference
Signal obtains the partial discharge quantity of test product.When applying DC voltage in outside, external voltage source charges to the capacitor in test product,
When capacitance voltage is charged to the peak value of external voltage source, capacitor does not recharge, due to the capacitor of the full-bridge modules circuit
It can charge, but can not externally discharge, can only be released energy by resistance in parallel therewith, because the resistance of parallel connection is very big,
Its discharge process is relatively slow.In the present embodiment, experiment power supply voltage is about 2.63kV, on the voltage and electric capacity at test product both ends
Voltage be respectively 2.548kV and 2.546kV, about 0.04A electric current in test product test loop always be present, test product both ends
The voltage difference of voltage and electric capacity is mainly the tube voltage drop of diode.
In a preferred embodiment, upon step s 2 with also including step S2 ' before step S3, direct current to be measured is broken
Differential signal between road device test product and balancing capacitance is amplified, and can preferably be gathered differential signal and be obtained part with this
Discharge capacity.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (7)
- A kind of 1. pressure-resistant local discharge test circuit of dc circuit breaker, it is characterised in that including：Dc source, balancing capacitance, measurement electricity Current transformer, partial discharge tester, wherein：The dc source provides electric energy for dc circuit breaker test product to be measured；The balancing capacitance is connected in parallel with the dc circuit breaker test product to be measured；The measurement current transform er gathers the dc circuit breaker test product and the differential signal of the balancing capacitance, to the difference Sub-signal is exported to the partial discharge tester after being amplified；The partial discharge tester receives the differential signal after amplification, measures the shelf depreciation of the dc circuit breaker test product to be measured Amount.
- 2. the pressure-resistant local discharge test circuit of dc circuit breaker according to claim 1, it is characterised in that also include：Current limliting is protected Resistance is protected, the current limiting safeguard resistor is connected in series between the dc source and the dc circuit breaker test product to be measured, is used So that the charging current of the dc circuit breaker test product to be kept within a preset range.
- 3. the pressure-resistant local discharge test circuit of dc circuit breaker according to claim 2, it is characterised in that the current-limiting protection electricity The scope of the resistance value of resistance is 100 Ω~2k Ω, and power is 100W~2kW.
- 4. the pressure-resistant local discharge test circuit of dc circuit breaker according to claim 1, it is characterised in that the dc source bag Include：Alternating-current voltage source, bridge rectifier and the electric capacity of voltage regulation being connected in parallel.
- 5. the pressure-resistant local discharge test circuit of dc circuit breaker according to claim 4, it is characterised in that the electric capacity of voltage regulation The scope of capacitance is the μ F of 10 μ F~300.
- 6. a kind of pressure-resistant partial discharge method of testing of dc circuit breaker, it is characterised in that comprise the following steps：In preset time, the voltage of dc circuit breaker test product to be measured is kept within a preset range；Gather the differential signal between the dc circuit breaker test product to be measured and balancing capacitance；The partial discharge quantity of the dc circuit breaker test product to be measured is obtained according to the differential signal.
- 7. the pressure-resistant partial discharge method of testing of dc circuit breaker according to claim 6, it is characterised in that described to be measured gathering The direct current to be measured is obtained after differential signal between dc circuit breaker test product and balancing capacitance, according to the differential signal to break Before the partial discharge quantity of road device test product, in addition to：The differential signal is amplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710681001.0A CN107728031A (en) | 2017-08-10 | 2017-08-10 | A kind of dc circuit breaker is pressure-resistant local discharge test circuit and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710681001.0A CN107728031A (en) | 2017-08-10 | 2017-08-10 | A kind of dc circuit breaker is pressure-resistant local discharge test circuit and test method |
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| CN107728031A true CN107728031A (en) | 2018-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710681001.0A Pending CN107728031A (en) | 2017-08-10 | 2017-08-10 | A kind of dc circuit breaker is pressure-resistant local discharge test circuit and test method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557354A (en) * | 2018-10-17 | 2019-04-02 | 全球能源互联网研究院有限公司 | A kind of wideband voltage transformer containing capacitance-resistance mixed connection topology unit |
| CN109655744A (en) * | 2019-01-07 | 2019-04-19 | 国家电网有限公司 | A kind of dc circuit breaker test voltage generative circuit and generation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101004436A (en) * | 2007-01-22 | 2007-07-25 | 西南交通大学 | High senitive system for detecting local discharging of high voltage electric power equipment with large capacity |
| CN103675663A (en) * | 2013-12-05 | 2014-03-26 | 南方电网科学研究院有限责任公司 | Performance test device of mixed-type direct-current solid-state breaker |
| CN103913681A (en) * | 2014-03-24 | 2014-07-09 | 华北电力大学 | System and method for detecting partial discharge under high-frequency voltage |
| CN207067331U (en) * | 2017-08-10 | 2018-03-02 | 全球能源互联网研究院有限公司 | A kind of pressure-resistant local discharge test circuit of dc circuit breaker |
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2017
- 2017-08-10 CN CN201710681001.0A patent/CN107728031A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101004436A (en) * | 2007-01-22 | 2007-07-25 | 西南交通大学 | High senitive system for detecting local discharging of high voltage electric power equipment with large capacity |
| CN103675663A (en) * | 2013-12-05 | 2014-03-26 | 南方电网科学研究院有限责任公司 | Performance test device of mixed-type direct-current solid-state breaker |
| CN103913681A (en) * | 2014-03-24 | 2014-07-09 | 华北电力大学 | System and method for detecting partial discharge under high-frequency voltage |
| CN207067331U (en) * | 2017-08-10 | 2018-03-02 | 全球能源互联网研究院有限公司 | A kind of pressure-resistant local discharge test circuit of dc circuit breaker |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557354A (en) * | 2018-10-17 | 2019-04-02 | 全球能源互联网研究院有限公司 | A kind of wideband voltage transformer containing capacitance-resistance mixed connection topology unit |
| CN109557354B (en) * | 2018-10-17 | 2023-11-07 | 全球能源互联网研究院有限公司 | Broadband voltage transformer containing resistance-capacitance series-parallel topological unit |
| CN109655744A (en) * | 2019-01-07 | 2019-04-19 | 国家电网有限公司 | A kind of dc circuit breaker test voltage generative circuit and generation method |
| CN109655744B (en) * | 2019-01-07 | 2021-02-09 | 国家电网有限公司 | Direct current breaker test voltage generation circuit and generation method |
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Address after: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Applicant after: Global energy Internet Institute, Inc. Applicant after: State Grid Corporation of China Applicant after: State Grid Liaoning Electric Power Co., Ltd. Address before: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Applicant before: Global energy Internet Institute, Inc. Applicant before: State Grid Corporation of China Applicant before: State Grid Liaoning Electric Power Co., Ltd. |
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