CN110196383A - The method for carrying out ipsilateral high-tension apparatus Partial Discharge Detection using capacitive bottom shielding of bushing - Google Patents
The method for carrying out ipsilateral high-tension apparatus Partial Discharge Detection using capacitive bottom shielding of bushing Download PDFInfo
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- CN110196383A CN110196383A CN201910603939.XA CN201910603939A CN110196383A CN 110196383 A CN110196383 A CN 110196383A CN 201910603939 A CN201910603939 A CN 201910603939A CN 110196383 A CN110196383 A CN 110196383A
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- bushing
- capacitive
- bottom shielding
- tension apparatus
- discharge signal
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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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- 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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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention discloses a kind of methods for carrying out ipsilateral high-tension apparatus Partial Discharge Detection using capacitive bottom shielding of bushing.The present invention is premised on the capacitive casing of power transformer, using the capacitance of bushing in the capacitive casing of power transformer as coupled capacitor, and bottom shielding of bushing sensor is installed additional at the end shield end of capacitive casing, it is used for the bottom shielding of bushing sensor Z that the end shield end of capacitive casing installs additional to couple local discharge signal simultaneously, the other end is connected on instrument M simultaneously, and the detection of ipsilateral high-tension apparatus shelf depreciation is realized with this.The present invention solves the problems, such as not can increase Coupling device when online or live detection, while realizing and being not required in addition when having a power failure detection and connect high-tension coupling condenser, and the investment of test detecting equipment can be reduced with this.By the capacitance of bushing in the capacitive casing using power transformer as Partial discharge signal coupled capacitor, the Partial discharge signal for picking up power transformer itself can be coupled, and the Partial discharge signal for picking up ipsilateral high voltage electric equipment can be coupled.
Description
Technical field
The invention belongs to high pressure detection technique fields, and in particular to a kind of to be set using the ipsilateral high pressure of capacitive bottom shielding of bushing progress
The method of standby Partial Discharge Detection.
Background technique
Power transformer is the core electrical equipment in high voltage generating station, and the inlet-outlet sleeve of each side is all directly connected with bus
Then the high voltage electric equipments such as breaker, disconnecting switch, mutual inductor or GIS.
Excellent insulation performance is high voltage installation or even the basic condition that network system operates normally, insulation degradation or exhausted
The failure of edge ability is to lead to high voltage electric equipment and network system failure one of the main reasons.With detection Characteristics of Partial Discharge reflection
The state of insulation of high voltage electric equipment is known as most sensitive, most effective means by industry.
Currently, the measurement of shelf depreciation frequently be pulse current method, as shown in Figure 1, according to the base of pulse current method
Present principles need a coupled capacitor CKMake pulse current flow cycle with test product Cx composition.
But in practical applications, there are some difficulties for the increase of coupled capacitor equipment.When online or live detection, it is desirable that inspection
Survey means, which cannot run grid equipment, electric effect, cannot separately increase coupling in high pressure because detection is needed and set
It is standby, therefore the Partial Discharge Detection for causing power transformer and ipsilateral high-tension apparatus is difficult；When having a power failure detection, due to high pressure
Equipment itself does not generally have the coupling condition of local discharge signal, so generally requiring in addition and connecing high pressure coupled capacitor
Device, and this will increase the investment of test detecting equipment.
Summary of the invention
The purpose of the present invention is to the deficiencies in the prior art, provides and a kind of capacitive bottom shielding of bushing is utilized to carry out ipsilateral height
The method for pressing apparatus local discharge detection.
It is as follows that the present invention solves technical solution used by its technical problem:
The inlet-outlet line of 110kV grade and the above power transformer mainly uses capacitive casing at present, in the low pressure tail of casing
Portion can all draw the end shield end (i.e. bottom shielding of bushing) of a ground connection.
The detection device of ipsilateral high-tension apparatus shelf depreciation is carried out, using capacitive bottom shielding of bushing with the capacitive of power transformer
Premised on casing, using the capacitance of bushing in the capacitive casing of power transformer as coupled capacitor, and in the end shield of capacitive casing
End installs bottom shielding of bushing sensor Z additional for coupling local discharge signal, while the other end is connected on instrument M, is realized together with this
The detection of side high-tension apparatus shelf depreciation.The instrument M model XD56 high frequency partial discharge detector.
The bottom shielding of bushing sensor Z of the installation is built-in with ceramic ring and winds the coil composition of ceramic ring, is installing casing additional
After end shield sensor Z, the present invention couples local discharge signal by ceramic ring and coil, instead of the mutual sensing mode of original magnetic core.
Most short grounding path is formed in the case where not changing original earthing mode.
Bottom shielding of bushing sensor Z of the present invention is referring to a kind of capacitive bottom shielding of bushing signal supervisory instrument.
The present invention is specifically that realization process is as follows:
The present invention is specifically that realization process is as follows:
Step 1, as shown in Fig. 2, using equipment under test as test product Cxn, by the casing in the capacitive casing of power transformer
Capacitor is as Partial discharge signal coupled capacitor CK, from without separately and connecing Coupling device；The end shield end of capacitive casing is installed additional
Bottom shielding of bushing sensor Z is for coupling local discharge signal, while the other end is connected on instrument M by coil；The examination
Product CxnIt can be power transformer itself, be also possible to ipsilateral high-tension apparatus, as Fig. 2 test product is denoted as Cx respectively1、Cx2、
Cx3……CxnDeng.The high-tension apparatus is attached by bus and power transformer.
Step 2, as test product CxnWhen generating shelf depreciation, pulse current passes through coupled capacitor CKIn bottom shielding of bushing sensor Z
Both ends generate an instantaneous voltage change, i.e. pulse voltage；Bottom shielding of bushing sensor Z, which can be coupled, reads shelf depreciation
Signal, and local discharge signal is transferred on instrument M；
Above-mentioned local discharge signal is acquired, amplifies and shows by step 3, instrument M, can measure shelf depreciation
Basic parameter.
The present invention has the beneficial effect that:
The problem of present invention not can increase Coupling device when not only can solve online or live detection, may be implemented in simultaneously
Have a power failure and be not required in addition when detecting and connect high-tension coupling condenser, the investment of test detecting equipment can be reduced with this.
In addition, by the capacitance of bushing in the capacitive casing using power transformer as Partial discharge signal coupled capacitor, not only
The Partial discharge signal for picking up power transformer itself can be coupled, and the partial discharge letter for picking up ipsilateral high voltage electric equipment can be coupled
Number.
Detailed description of the invention
Fig. 1 is pulse current method basic principle schematic；
Fig. 2 is basic principle schematic of the invention；
Fig. 3 is the example schematic that the present invention carries out partial discharge detection test.
Specific embodiment
The present invention is described in detail below in conjunction with attached drawing, it is noted that described embodiment is only convenient for pair
Understanding of the invention, and do not play any restriction effect to it.
In high voltage generating station other than core electrical equipment power transformer, the inlet-outlet sleeve of each side is straight with bus
Then high voltage electric equipments such as breaker, disconnecting switch, mutual inductor or GIS in succession.By by the capacitive set of power transformer
Capacitance of bushing in pipe can not only couple the Partial discharge signal for picking up power transformer itself as Partial discharge signal coupled capacitor,
And the Partial discharge signal for picking up ipsilateral high voltage electric equipment can be coupled.
As shown in figure 3, it includes high-pressure side, medium voltage side and low-pressure side that the transformer, which is three-phase power transformer, and high-pressure side
Connection is GIS, and medium voltage side connection is mutual inductor, and low-pressure side connection is breaker.
By taking Fig. 3 as an example, specific step is as follows for the method for the present invention:
Step (1) assumes that product to be tested Cx is GIS, then the electric power of same side should be selected to become to improve detection sensitivity
Capacitance of bushing in the capacitive casing of depressor is as coupled capacitor CK, and install bottom shielding of bushing sensor additional on the bottom shielding of bushing
Z, while the other end is connected on instrument M.
Step (2) can be coupled by sensor Z when test product GIS generates shelf depreciation and read local discharge signal,
And local discharge signal is transferred on instrument M.
Step (3) instrument M is acquired above-mentioned local discharge signal, amplifies and shows, to measure shelf depreciation
Amount.
The bottom shielding of bushing sensor Z of the installation is built-in with ceramic ring and winds the coil composition of ceramic ring, senses installing additional
After device Z, the present invention couples local discharge signal by ceramic ring and coil, instead of the mutual sensing mode of original magnetic core.
Pass through examples detailed above, it can be seen that using using the capacitance of bushing in capacitive casing as the side of Partial discharge signal coupled capacitor
Formula, the method for carrying out ipsilateral high-tension apparatus Partial Discharge Detection using capacitive bottom shielding of bushing can solve online or with electric-examination
The problem of Coupling device cannot separately be increased when survey, can also be reduced when having a power failure detection separately and the equipment that connects high-tension coupling condenser
Investment.Meanwhile the Partial discharge signal for picking up power transformer itself can not only be coupled, and can couple and pick up ipsilateral high-voltage electricity
The Partial discharge signal of gas equipment.
Claims (6)
1. carrying out the detection device of ipsilateral high-tension apparatus shelf depreciation using capacitive bottom shielding of bushing, it is characterised in that with power transformer
Premised on the capacitive casing of device, using the capacitance of bushing in the capacitive casing of power transformer as coupled capacitor, and in capacitive set
The end shield end of pipe installs sensor Z additional for coupling local discharge signal, while the other end is connected on instrument M, is realized together with this
The detection of side high-tension apparatus shelf depreciation.
2. the detection device according to claim 1 that ipsilateral high-tension apparatus shelf depreciation is carried out using capacitive bottom shielding of bushing,
It is characterized in that the instrument M model XD56 high frequency partial discharge detector.
3. the detection according to claim 1 or 2 for carrying out ipsilateral high-tension apparatus shelf depreciation using capacitive bottom shielding of bushing fills
It sets, it is characterised in that the sensor Z of the installation is built-in with ceramic ring and winds the coil composition of ceramic ring, passes through ceramic ring and coil
Local discharge signal is coupled, forms most short grounding path in the case where not changing original earthing mode.
4. the detection device according to claim 3 for carrying out ipsilateral high-tension apparatus shelf depreciation using capacitive bottom shielding of bushing
Implementation method, it is characterised in that include the following steps:
Step 1, using equipment under test as test product CxN,Using the capacitance of bushing in the capacitive casing of power transformer as Partial discharge signal
Coupled capacitor CK, from without separately and connecing Coupling device；The bottom shielding of bushing sensor Z that the end shield end of capacitive casing is installed additional is used
In coupling local discharge signal, while the other end is connected on instrument M；
Step 2, as test product CxnWhen generating shelf depreciation, pulse current passes through coupled capacitor CKThe two of bottom shielding of bushing sensor Z
End generates an instantaneous voltage change, i.e. pulse voltage；Bottom shielding of bushing sensor Z, which can be coupled, reads shelf depreciation letter
Number, and local discharge signal is transferred on instrument M；
Above-mentioned local discharge signal is acquired, amplifies and shows by step 3, instrument M, can measure the basic of shelf depreciation
Parameter.
5. the detection device according to claim 4 for carrying out ipsilateral high-tension apparatus shelf depreciation using capacitive bottom shielding of bushing
Implementation method, it is characterised in that the test product CxnFor power transformer itself or ipsilateral high-tension apparatus.
6. the detection device according to claim 5 for carrying out ipsilateral high-tension apparatus shelf depreciation using capacitive bottom shielding of bushing
Implementation method, it is characterised in that the high-tension apparatus is attached by bus and power transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910603939.XA CN110196383A (en) | 2019-07-05 | 2019-07-05 | The method for carrying out ipsilateral high-tension apparatus Partial Discharge Detection using capacitive bottom shielding of bushing |
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| CN201910603939.XA CN110196383A (en) | 2019-07-05 | 2019-07-05 | The method for carrying out ipsilateral high-tension apparatus Partial Discharge Detection using capacitive bottom shielding of bushing |
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| CN110196383A true CN110196383A (en) | 2019-09-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557845A (en) * | 2020-11-27 | 2021-03-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Capacitive bushing partial discharge positioning method |
| CN113466637A (en) * | 2021-06-08 | 2021-10-01 | 国网宁夏电力有限公司电力科学研究院 | Phase synchronization measurement method, device and system for partial discharge of transformer |
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| CN103558522A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for detecting partial discharge of transformer under surge voltage |
| 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 |
| CN105403818A (en) * | 2015-11-19 | 2016-03-16 | 北京邦瑞智能电网技术有限公司 | Method and system for detecting transformer partial discharge based on transformer bushing |
| CN207281235U (en) * | 2017-09-09 | 2018-04-27 | 广西电网有限责任公司电力科学研究院 | A kind of partial discharge intensity's detection circuit based on series process |
| 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 |
| CN210626597U (en) * | 2019-07-05 | 2020-05-26 | 杭州西湖电子研究所 | Detection apparatus for utilize capacitive sleeve pipe end screen to carry out homonymy high-tension apparatus partial discharge |
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2019
- 2019-07-05 CN CN201910603939.XA patent/CN110196383A/en active Pending
Patent Citations (6)
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| CN103558522A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for detecting partial discharge of transformer under surge voltage |
| 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 |
| CN105403818A (en) * | 2015-11-19 | 2016-03-16 | 北京邦瑞智能电网技术有限公司 | Method and system for detecting transformer partial discharge based on transformer bushing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557845A (en) * | 2020-11-27 | 2021-03-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Capacitive bushing partial discharge positioning method |
| CN112557845B (en) * | 2020-11-27 | 2022-05-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Capacitive bushing partial discharge positioning method |
| CN113466637A (en) * | 2021-06-08 | 2021-10-01 | 国网宁夏电力有限公司电力科学研究院 | Phase synchronization measurement method, device and system for partial discharge of transformer |
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