CN103323751A - High-voltage short-cable insulation terminal partial discharge testing device and using method - Google Patents
High-voltage short-cable insulation terminal partial discharge testing device and using method Download PDFInfo
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- CN103323751A CN103323751A CN2013102111606A CN201310211160A CN103323751A CN 103323751 A CN103323751 A CN 103323751A CN 2013102111606 A CN2013102111606 A CN 2013102111606A CN 201310211160 A CN201310211160 A CN 201310211160A CN 103323751 A CN103323751 A CN 103323751A
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Abstract
The invention relates to a high-voltage short-cable insulation terminal partial discharge testing device. One end of each cable is connected to the upper end of each protective layer protector. A power resistor is connected to the middle portion of each cable in series. The other end of each cable is connected with a grounding end of each protective layer protector and a direct grounding point of one end of each electric cable. A high-frequency current sensor is sleeved at intervals on the cable between the grounding end of each protective layer protector and each power resistor. An output end of the high-frequency current sensor is connected with partial discharge measuring equipment. The upper ends of the protective layer protectors of an insulation terminal and the grounding points are connected through the cables, output of the high-frequency current sensor is collected to complete partial discharge live detection of the insulation terminal, under the premise that normal operation of a circuit is guaranteed, live detection in which the protective layer protector is connected to the ground to detect electric cable terminal partial discharge is achieved, a testing process is quick, and convenience is achieved.
Description
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 terminal local discharge test device and using method.
Background technology
Power industry standard DL/T5221-2005 " urban electric power cable line designing technique regulation " stipulates with the company standard Q/GDW512-2010 of State Grid Corporation of China " power cable line operating standard ": the protective metal shell or the screen layer that exchange single core cable, has on the line a bit direct ground connection at least, when not taking to prevent the safety practice of any contacting metal sheath of personnel or screen layer, in the normal full load situation, the normal induction voltage at the ungrounded place of any point must not be greater than 50V on protective metal shell or the screen layer.
110kV and above high pressure stub cable circuit 1; usually without intermediate head; two ends cable termination 2 connects respectively other high-tension apparatus; such as the built on stilts power lead of stub cable connection and indoor substation GIS equipment; high pressure stub cable line-to-ground mode all satisfies afore mentioned rules, and earthing mode is an end ground connection 11, an end sheath protector 5 ground connection.
Tag is that the insulation defect that causes in the quality problems of the weak link of high pressure stub cable circuit, particularly annex itself and the site operation process is the main cause of cable line fault.According to statistics, cable line fault causes owing to cable accessory more than 95%.For the Voltage Cable Lines Construction of operation, high-frequency current shelf depreciation band electro-detection is to detect the effective ways of insulation hidden danger.By the high frequency partial discharge pulse current signal in the High Frequency Current Sensor detection ground current is installed at the cable termination ground wire, estimate the running status of cable termination.But for the cable termination of the sheath protector ground connection side of high pressure stub cable circuit, because no current flows through in the ground wire, 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, a kind of high pressure stub cable insulation terminal local discharge test device rational in infrastructure, convenient operation is provided.
The technical scheme that the present invention takes is:
A kind of high pressure stub cable insulation terminal local discharge test device; comprise three high pressure stub cables; insulation terminal and sheath protector; the direct ground connection of one end of every high pressure stub cable; the other end of every high pressure stub cable is by sheath protector ground connection; it is characterized in that: the upper end of described each sheath protector connects an end of a cable; this cable middle part series connection one power resistor; the other end of this cable connects each sheath protector earth terminal and the direct earth point of 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 terminal of this High Frequency Current Sensor connects measurement of partial discharge equipment.
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, and power is 250 watts.
Another object of the present invention provides a kind of using method of high pressure stub cable insulation terminal local discharge test device, it is characterized in that: may further comprise the steps:
⑴ be connected an end of cable with the tie point that cross interconnected case is positioned at the top;
⑵ make the middle part of cable repeatedly be wrapped on the High Frequency Current Sensor;
⑶ another tie point that be positioned at the other end of cable and cross interconnected case in the below and be connected same insulation intermediate connector with tie point described in the step ⑴ connects;
With the output terminal of High Frequency Current Sensor by coaxial signal line and measurement of partial discharge equipment connection;
⑸ finish the shelf depreciation band electro-detection of an insulation intermediate connector in the phase high-tension cable;
⑹ repeating step ⑴～⑸ finishes 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:
Among the present invention; connect each and sheath protector upper end and the earth point of the terminal that insulate by cable; the shelf depreciation band electro-detection of insulation terminal is finished in the output that gathers High Frequency Current Sensor; under the prerequisite that guarantees the normal operation of circuit; realized the band electro-detection of sheath protector ground measuring cable termination shelf depreciation; test process is rapid, and is very convenient.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, can not limit 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; comprise three high pressure stub cables 1; insulation terminal 2 and sheath protector 5; the direct ground connection of one end of every high pressure stub cable; the other end of every high pressure stub cable is by cable 3; tie point 4 and sheath protector ground connection; innovation of the present invention is: the upper end of described each sheath protector connects an end of a cable 6; this cable middle part series connection one power resistor 7; the other end of this cable connects each sheath protector earth terminal 11 and the direct earth point 11 of each cable one end; cable interval between sheath protector earth terminal and power resistor is set with a High Frequency Current Sensor 10, and the output terminal 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.Described power 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 may further comprise the steps:
⑴ be connected an end of cable with the tie point that cross interconnected case is positioned at the top;
⑵ make the middle part of cable repeatedly be wrapped on the High Frequency Current Sensor;
⑶ another tie point that be positioned at the other end of cable and cross interconnected case in the below and be connected same insulation intermediate connector with tie point described in the step ⑴ connects;
With the output terminal of High Frequency Current Sensor by coaxial signal line and measurement of partial discharge equipment connection;
⑸ finish the shelf depreciation band electro-detection of an insulation intermediate connector in the phase high-tension cable;
⑹ repeating step ⑴～⑸ finishes the shelf depreciation band electro-detection of insulation intermediate connector in all phase high-tension cables.
Among the present invention; connect each and sheath protector upper end and the earth point of the terminal that insulate by cable; the shelf depreciation band electro-detection of insulation terminal is finished in the output that gathers High Frequency Current Sensor; under the prerequisite that guarantees the normal operation of circuit; realized the band electro-detection of sheath protector ground measuring cable termination shelf depreciation; test process is rapid, and is very convenient.
Claims (4)
1. high pressure stub cable insulation terminal local discharge test device; comprise three high pressure stub cables; insulation terminal and sheath protector; the direct ground connection of one end of every high pressure stub cable; the other end of every high pressure stub cable is by sheath protector ground connection; it is characterized in that: the upper end of described each sheath protector connects an end of a cable; this cable middle part series connection one power resistor; the other end of this cable connects each sheath protector earth terminal and the direct earth point of 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 terminal of this High Frequency Current Sensor connects measurement of partial discharge equipment.
2. a kind of high pressure stub cable insulation terminal local discharge test device according to claim 1, it is characterized in that: described High Frequency Current Sensor connects described measurement of partial discharge equipment by coaxial signal line.
3. a kind of high pressure stub cable insulation terminal local discharge test device according to claim 1, it is characterized in that: the resistance of described power resistor is 10 ohm, power is 250 watts.
4. it is characterized in that: may further comprise the steps according to claim 1 and 2 or the using method of 3 or 4 described a kind of high pressure stub cables insulation terminal local discharge test devices:
⑴ be connected an end of cable with a tie point of sheath protector upper end;
⑵ cable middle part connects power resistor, then passes High Frequency Current Sensor;
With the output terminal of High Frequency Current Sensor by coaxial signal line and measurement of partial discharge equipment connection;
With the other end of cable and each sheath protector earth terminal be connected the direct earth point of cable one end and be connected;
⑸ finish the shelf depreciation band electro-detection of insulation terminal in the phase high-tension cable;
⑹ is connected an end of a cable tie point with another sheath protector upper end, and repeating step ⑵～⑸ finishes the shelf depreciation band electro-detection of the terminal that insulate in all phase high-tension cables.
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| 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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| 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 CN103323751B (en) | 2016-06-08 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104029A (en) * | 2014-06-18 | 2014-10-15 | 国家电网公司 | Multifunctional high-voltage cable earthing device capable of monitoring load state |
| CN104113004A (en) * | 2014-06-18 | 2014-10-22 | 国家电网公司 | High-voltage cable protection grounding system transfer device |
| CN104113005A (en) * | 2014-06-18 | 2014-10-22 | 国家电网公司 | High-voltage cable multifunctional grounding device |
| CN106054098A (en) * | 2016-08-16 | 2016-10-26 | 国网天津市电力公司 | Partial discharge on-site calibration method for high-voltage cable line GIS terminal |
| 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 |
| 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 |
| CN109428502A (en) * | 2017-08-22 | 2019-03-05 | 许继集团有限公司 | A kind of electricity getting device and method of cable sheath earthed system |
| CN111585060A (en) * | 2020-04-29 | 2020-08-25 | 昆明理工大学 | Novel single-core power cable metal sheath grounding mode |
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| JPH05153718A (en) * | 1991-11-26 | 1993-06-18 | Showa Electric Wire & Cable Co Ltd | Test cable terminal |
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| CN102565588A (en) * | 2012-01-14 | 2012-07-11 | 天津大学 | On-line monitoring method used for high-voltage XLPE (Cross Linked Polyethylene) cable |
| 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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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113004A (en) * | 2014-06-18 | 2014-10-22 | 国家电网公司 | High-voltage cable protection grounding system transfer device |
| CN104113005A (en) * | 2014-06-18 | 2014-10-22 | 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 |
| CN104104029A (en) * | 2014-06-18 | 2014-10-15 | 国家电网公司 | Multifunctional high-voltage cable earthing device capable of monitoring load state |
| CN104113005B (en) * | 2014-06-18 | 2017-01-18 | 国家电网公司 | High-voltage cable multifunctional grounding device |
| 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 |
| CN106054098A (en) * | 2016-08-16 | 2016-10-26 | 国网天津市电力公司 | Partial discharge on-site calibration method for high-voltage cable line GIS terminal |
| 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 |
| 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 |
| CN108344925B (en) * | 2017-01-24 | 2021-04-06 | 中国石油化工股份有限公司 | Power cable partial discharge monitoring device and method |
| CN109428502A (en) * | 2017-08-22 | 2019-03-05 | 许继集团有限公司 | A kind of electricity getting device and method of cable sheath earthed system |
| CN111585060A (en) * | 2020-04-29 | 2020-08-25 | 昆明理工大学 | Novel single-core power cable metal sheath grounding mode |
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