CN103323751B - A kind of high pressure stub cable insulation terminal local discharge test device and using method - Google Patents

A kind of high pressure stub cable insulation terminal local discharge test device and using method Download PDF

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Publication number
CN103323751B
CN103323751B CN201310211160.6A CN201310211160A CN103323751B CN 103323751 B CN103323751 B CN 103323751B CN 201310211160 A CN201310211160 A CN 201310211160A CN 103323751 B CN103323751 B CN 103323751B
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China
Prior art keywords
cable
end
high frequency
sheath protector
frequency current
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CN201310211160.6A
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Chinese (zh)
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CN103323751A (en
Inventor
周凤争
张东斐
朱晓辉
唐庆华
齐效华
孟峥峥
郭勇
王浩鸣
李旭
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国家电网公司
天津市电力公司
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Priority to CN201310211160.6A priority Critical patent/CN103323751B/en
Publication of CN103323751A publication Critical patent/CN103323751A/en
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Publication of CN103323751B publication Critical patent/CN103323751B/en

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Abstract

The present invention relates to a kind of high pressure stub cable insulation terminal local discharge test device; the upper end of described each sheath protector connects one end of a cable; this cable middle part series connection one power resistor; the other end of this cable connects the direct earth point of each sheath protector earth terminal and each cable one end; cable interval between sheath protector earth terminal and power resistor is set with a High Frequency Current Sensor, and the output of this High Frequency Current Sensor connects measurement of partial discharge equipment. In the present invention; connect each and sheath protector upper end and the earth point of the terminal that insulate by cable; the output that gathers High Frequency Current Sensor completes the shelf depreciation band electro-detection of insulation terminal; ensureing under the prerequisite of the normal operation of circuit; realize the band electro-detection of sheath protector ground measuring cable termination shelf depreciation; test process is rapid, very convenient.

Description

A kind of high pressure stub cable insulation terminal local discharge test device and using method

Technical field

The invention belongs to high pressure stub cable insulation terminal local discharge test device field, especially a kind of high pressure stub cable insulation eventuallyEnd local discharge test device and using method.

Background technology

Power industry standard DL/T5221-2005 " urban electric power cable run designing technique regulation " and enterprise of State Grid Corporation of ChinaIndustry standard Q/GDW512-2010 " power cable line operating standard " regulation: exchange protective metal shell or the shielding of single-core cableLayer, has a bit directly ground connection at least, on the line in the safety of not taking to prevent any contacting metal sheath of personnel or screen layerWhen measure, in normal full load situation, on protective metal shell or screen layer, the normal induction voltage at the ungrounded place of any point must not be largeIn 50V.

110kV and above high pressure stub cable circuit 1, conventionally without transition joint, two ends cable termination 2 connects respectively itIts high-tension apparatus, power line as built on stilts in stub cable connection and indoor substation GIS equipment, high pressure stub cable line-to-ground sideFormula all meets afore mentioned rules, and earthing mode is one end ground connection 11, one end sheath protector 5 ground connection.

Tag is quality problems and the site operation of the weak link of high pressure stub cable circuit, particularly annex itselfThe insulation defect causing in process is the main cause of cable line fault. According to statistics, more than 95% of cable line fault be byCause in cable accessory. For the Voltage Cable Lines Construction of operation, high frequency electric shelf depreciation band electro-detection is to detect insulation hidden dangerEffective ways. By being installed on cable termination earth connection, High Frequency Current Sensor detects the high frequency partial electric discharge in earth currentPulsed current signal, the running status of evaluation cable termination. But for the sheath protector ground connection side of high pressure stub cable circuitCable termination, because no current in earth connection flows through, the method that there is no is at present carried out Partial Discharge Detection.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, provide a kind of high pressure stub cable rational in infrastructure, convenient operation exhaustedEdge terminal local discharge test device.

The technical scheme that the present invention takes is:

A kind of high pressure stub cable insulation terminal local discharge test device, comprises three high pressure stub cables, insulation terminal and sheath guarantorProtect device, the direct ground connection in one end of every high pressure stub cable, the other end of every high pressure stub cable passes through sheath protector ground connection, itsBe characterised in that: the upper end of described each sheath protector connects one end of a cable, this cable middle part series connection one power resistor, shouldThe other end of cable connects the direct earth point of each sheath protector earth terminal and each cable one end, at sheath protector earth terminalWith cable interval between power resistor is set with a High Frequency Current Sensor, the output of this High Frequency Current Sensor connects part and putsElectrical measuring device.

And described High Frequency Current Sensor connects described measurement of partial discharge equipment by coaxial signal line.

And the resistance of described power resistor is 10 ohm, power is 250 watts.

Another object of the present invention is to provide a kind of using method of high pressure stub cable insulation terminal local discharge test device, itsBe characterised in that: comprise the following steps:

(1) a tie point that one end of cable and cross interconnected case is positioned to top is connected;

(2) make the middle part of cable repeatedly be wrapped in High Frequency Current Sensor;

(3) the other end of cable and cross interconnected case are positioned at below and with step (1) described in tie point be connected same insulation indirectAnother tie point of head connects;

By the output of High Frequency Current Sensor by coaxial signal line and measurement of partial discharge equipment connection;

(5) complete the shelf depreciation band electro-detection of an insulation intermediate connector in a phase high-tension cable;

Repeating step (1)~(5), complete the shelf depreciation band electro-detection of insulation intermediate connector in all phase high-tension cables.

Advantage of the present invention and good effect are:

In the present invention, connect each and sheath protector upper end and the earth point of the terminal that insulate by cable, gather high frequency electricThe output of sensor completes the shelf depreciation band electro-detection of insulation terminal, under the prerequisite of the normal operation of guarantee circuit, has realizedThe band electro-detection of sheath protector ground measuring cable termination shelf depreciation, test process is rapid, very convenient.

Brief description of the drawings

Fig. 1 is structural representation of the present invention.

Detailed description of the invention

Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, can notLimit protection scope of the present invention with following embodiment.

A kind of high pressure stub cable insulation terminal local discharge test device, as shown in Figure 1, comprises three high pressure stub cables 1, insulationTerminal 2 and sheath protector 5, the direct ground connection in one end of every high pressure stub cable, the other end of every high pressure stub cable passes through lineCable 3, tie point 4 and sheath protector ground connection, innovation of the present invention is: the upper end of described each sheath protector connects oneOne end of cable 6, this cable middle part series connection one power resistor 7, the other end of this cable connects each sheath protector earth terminal11 and the direct earth point 11 in each cable one end, the cable interval between sheath protector earth terminal and power resistor is set with a heightFrequently current sensor 10, the output of this High Frequency Current Sensor connects measurement of partial discharge equipment 8.

In the present embodiment, described High Frequency Current Sensor connects described measurement of partial discharge equipment by coaxial signal line 9. DescribedPower resistor is that 50V calculates according to the voltage of tie point, and its resistance is 10 ohm, and power is 250 watts.

The using method of above-mentioned high pressure stub cable insulation terminal local discharge test device, comprises the following steps:

(1) a tie point that one end of cable and cross interconnected case is positioned to top is connected;

(2) make the middle part of cable repeatedly be wrapped in High Frequency Current Sensor;

(3) the other end of cable and cross interconnected case are positioned at below and with step (1) described in tie point be connected same insulation indirectAnother tie point of head connects;

By the output of High Frequency Current Sensor by coaxial signal line and measurement of partial discharge equipment connection;

(5) complete the shelf depreciation band electro-detection of an insulation intermediate connector in a phase high-tension cable;

Repeating step (1)~(5), complete the shelf depreciation band electro-detection of insulation intermediate connector in all phase high-tension cables.

In the present invention, connect each and sheath protector upper end and the earth point of the terminal that insulate by cable, gather high frequency electricThe output of sensor completes the shelf depreciation band electro-detection of insulation terminal, under the prerequisite of the normal operation of guarantee circuit, has realizedThe band electro-detection of sheath protector ground measuring cable termination shelf depreciation, test process is rapid, very convenient.

Claims (1)

1. a using method for high pressure stub cable insulation terminal local discharge test device, comprises three high pressure stub cables, insulationTerminal and sheath protector, the direct ground connection in one end of every high pressure stub cable, the other end of every high pressure stub cable is protected by sheathProtect device ground connection, it is characterized in that: the upper end of described each sheath protector connects one end of a cable, this cable middle part series connection onePower resistor, the other end of this cable connects the direct earth point of each sheath protector earth terminal and each cable one end, at sheathCable interval between protector earth terminal and power resistor is set with a High Frequency Current Sensor, the output of this High Frequency Current SensorEnd connects measurement of partial discharge equipment;
Described High Frequency Current Sensor connects described measurement of partial discharge equipment by coaxial signal line;
The resistance of described power resistor is 10 ohm, and power is 250 watts;
Described using method comprises the following steps:
(1) one end of cable is connected with a tie point of sheath protector upper end;
(2) cable middle part connects power resistor, then through High Frequency Current Sensor;
By the output of High Frequency Current Sensor by coaxial signal line and measurement of partial discharge equipment connection;
(4) the other end of cable is connected with the direct earth point of each sheath protector earth terminal and each cable one end;
(5) complete the shelf depreciation band electro-detection of the terminal that insulate in a phase high-tension cable;
(6) one end of cable is connected with a tie point of another sheath protector upper end, repeating step (2)~(5), complete instituteThere is the shelf depreciation band electro-detection of the terminal that insulate in phase high-tension cable.
CN201310211160.6A 2013-05-31 2013-05-31 A kind of high pressure stub cable insulation terminal local discharge test device and using method CN103323751B (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN201310211160.6A CN103323751B (en) 2013-05-31 2013-05-31 A kind of high pressure stub cable insulation terminal local discharge test device and using method

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CN103323751B true CN103323751B (en) 2016-06-08

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CN104113005B (en) * 2014-06-18 2017-01-18 国家电网公司 High-voltage cable multifunctional grounding device
CN104113004B (en) * 2014-06-18 2016-08-24 国家电网公司 A kind of high tension cable protective grounding system switching device
CN104104029B (en) * 2014-06-18 2016-10-19 国家电网公司 A kind of multifunctional grounded device of high tension cable monitoring load condition
CN105717428B (en) * 2016-02-19 2018-09-04 西安交通大学 A kind of cable partial discharge live correction method based on HFCT
CN106054098B (en) * 2016-08-16 2019-01-15 国网天津市电力公司 Voltage Cable Lines Construction GIS terminal shelf depreciation field calibration method
CN108344927A (en) * 2017-01-24 2018-07-31 中国石油化工股份有限公司 A kind of power cable partial discharge monitoring device and method
CN108344925A (en) * 2017-01-24 2018-07-31 中国石油化工股份有限公司 A kind of power cable partial discharge monitoring device and method
CN108344926A (en) * 2017-01-24 2018-07-31 中国石油化工股份有限公司 A kind of power cable local discharge on-line monitoring device and method
CN108344928A (en) * 2017-01-24 2018-07-31 中国石油化工股份有限公司 A kind of power cable local discharge on-line monitoring device and method

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CN102879716A (en) * 2012-09-24 2013-01-16 哈尔滨理工大学 Method and device for monitoring main insulation of three phases of cables under intersection and interconnection of metal protective layers on line

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