CN208937675U - A kind of direct current cables local discharge detection device - Google Patents
A kind of direct current cables local discharge detection device Download PDFInfo
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- CN208937675U CN208937675U CN201821058325.5U CN201821058325U CN208937675U CN 208937675 U CN208937675 U CN 208937675U CN 201821058325 U CN201821058325 U CN 201821058325U CN 208937675 U CN208937675 U CN 208937675U
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Abstract
The utility model discloses a kind of direct current cables local discharge detection devices, are related to shelf depreciation onthe technology of site test field.Currently, there are no perfect detection devices for the shelf depreciation of high-tension cable under DC voltage, also without corresponding standard and special measuring instrument.The utility model includes high voltage direct current output device, load current stacking apparatus, first terminal, second terminal, conducting wire, the DC partial discharge measuring device for detecting tested cable partial discharge signal, the temperature measuring device for detecting tested cable temperature and the connector set on tested cable middle position for connecting first terminal and second terminal；The DC partial discharge measuring device, temperature measuring device are respectively arranged on the tested cable of connector two sides.By applying rated load current to cable loop, the Partial Discharge Detection for high voltage cable insulation defect under DC voltage is had effectively achieved.
Description
Technical field
The utility model relates to shelf depreciation onthe technology of site test fields more particularly to a kind of direct current cables shelf depreciation to examine
Survey device.
Background technique
Flexible HVDC transmission system is quickly grown in fields such as global long distance power transmissions, in the offshore wind farm system in Europe
Also by high voltage direct current sea cable realize on Continental Europe power generation, transmission of electricity, China also have Shantou Nan'ao, Zhoushan Of Zhejiang Province,
The representativeness flexible HVDC transmission system such as Xiamen of Fujian Province, high voltage direct current cable is its important composition component.High voltage direct current cable is such as
It is bad to there is quality in process of production, or passes through long-play, insulating layer is by external force destruction or transition joint aging etc.
It will lead to damage in insulation and cable deterioration, require to find in advance by test method.It is tested by DC break down voltage, it can be found that
The whole deterioration condition of cable insulation, however can pressure test only focuses on cable integrally completely bear the test of test voltage,
The latent defect of the cable of many types needs to find by the detection of shelf depreciation, mainly it can be found that in cable insulation medium
The local defects such as damage, and carry out field integrated diagnosis in high-voltage alternating cable and have the effect of certain, but DC voltage
There are no perfect detection devices for the shelf depreciation of lower high-tension cable, also without corresponding standard and special measuring instrument.
Utility model content
The technical problems to be solved in the utility model and the technical assignment of proposition be prior art is carried out improve with
It improves, a kind of direct current cables local discharge detection device is provided, lacked with effective realize for high-voltage cable insulating under DC voltage
For the purpose of sunken Partial Discharge Detection.For this purpose, the utility model takes following technical scheme.
A kind of direct current cables local discharge detection device, including high voltage direct current output device, load current stacking apparatus, the
One terminal, second terminal, connection first terminal and the conducting wire of second terminal, the direct current office for detecting tested cable partial discharge signal
Portion's discharge measuring device, the temperature measuring device for detecting tested cable temperature and connecing set on tested cable middle position
Head；The DC partial discharge measuring device, temperature measuring device are respectively arranged on the tested cable of connector two sides.
By applying rated load current, after being superimposed with rated load to tested cable, conductor temperature to cable loop
Degree rises, and the device of high voltage direct current output at this time provides operation DC voltage, and DC partial discharge measuring device detects tested cable
Whether circuit discharges, and has effectively achieved the Partial Discharge Detection for high voltage cable insulation defect under DC voltage.
As further improving and supplementing to above-mentioned technical proposal, the utility model further includes that following supplementary technology is special
Sign.
High voltage direct current output device includes AC boosting device, voltage doubling rectifing circuit, current-limiting resistance, and high voltage direct current exports device
Output end be connected with tested cable by first terminal；The output end of load current stacking apparatus passes through current transformer and leads
Line is connected；Conducting wire one end is connected with first terminal, and the other end of conducting wire is connected with second terminal.Current-limiting resistance is for protecting electricity
Road prevents electric current excessive.
The tested cable includes the first tested cable and the second tested cable, one end and first of the first tested cable
Terminal is connected, and the other end of the first tested cable is connected by connector with one end of the second tested cable, the second tested cable
The other end is connected with second terminal；The stress cone of connector biases on the axial position of tested cable.The stress cone of connector is in quilt
It surveys on the axial position of cable and biases, the discharge inception voltage of defect can be substantially reduced, and discharge capacity can also substantially increase,
Electric discharge also will be more stable, be more favorable for the measurement of partial discharge of direct current cables.
Connect the first tested cable, the transition joint of the second tested cable deviates intermediate mounting distance on axial position and is
10~20mm.
High voltage direct current exports device parallel connection bleeder circuit, and described DC partial discharge measuring device one end passes through high-frequency electrical
Flow sensor is connected with tested cable, and the other end of DC partial discharge measuring device is connected with bleeder circuit.
DC partial discharge measuring device detects the partial discharge of the first cable；Temperature measuring device detects the temperature of the second cable
Degree.
When carrying out DC boosting in cable loop, DC voltage boosts step by step, and the duration of every level-one is not shorter than 2 points
Clock.It boosts step by step, dc voltage boost should not be too fast.
The temperature transducer of temperature measuring device uses thermocouple.Using universal, structure is simple, easily manufactured, measurement model
Enclose wide, precision height.
The utility model has the advantages that the technical program reliable operation, and measure loop structure is simple, can effectively detect that XLPE cable returns
Insulation defect present in road；The stress cone of connector biases on the axial position of tested cable, can substantially reduce defect
Discharge inception voltage, and discharge capacity can also substantially increase, and electric discharge also will be more stable, and the part for being more favorable for direct current cables is put
Electrical measurement.
Detailed description of the invention
Fig. 1 is the schematic diagram that the utility model direct current cables superposition load carries out shelf depreciation test.
Fig. 2 is the stress cone defect model schematic diagram that use is tested in the utility model.
In figure: 1- cable；2- conducting wire；3- load current stacking apparatus；4- temperature measuring device；5- DC partial discharge is surveyed
Measure device；6- high voltage direct current exports device；7-HFCT；8- connector.
Specific embodiment
The technical solution of the utility model is described in further detail below in conjunction with Figure of description.
As shown in Figure 1, a kind of direct current cables local discharge detection device, including high voltage direct current export device 6, load current
Stacking apparatus 3, first terminal, second terminal, connection first terminal and second terminal conducting wire 2, for detecting tested cable 1 innings
It the DC partial discharge measuring device 5 of discharge signal, the temperature measuring device 4 for detecting tested 1 temperature of cable and is set to tested
The connector 8 in 1 middle position of cable；The DC partial discharge measuring device 5, temperature measuring device 4 are respectively arranged on connector two
The tested cable 1 of side.
It includes AC boosting device, voltage doubling rectifing circuit, current-limiting resistance, high voltage direct current output dress that high voltage direct current, which exports device 6,
6 output end is set to be connected by first terminal with tested cable 1；The output end of load current stacking apparatus 3 passes through Current Mutual Inductance
Device is connected with conducting wire 2；2 one end of conducting wire is connected with first terminal, and the other end of conducting wire 2 is connected with second terminal.Described is tested
Cable 1 includes the first tested cable and the second tested cable, and one end of the first tested cable is connected with first terminal, and first is tested
The other end of cable is connected by connector with one end of the second tested cable, the other end and the second terminal phase of the second tested cable
Even；The stress cone of connector biases on the axial position of tested cable.Connect the centre of the first tested cable, the second tested cable
It is 15mm that connector deviates normal mounting distance on axial position.
High voltage direct current exports the bleeder circuit in parallel of device 6, and described 5 one end of DC partial discharge measuring device passes through high frequency
Current sensor is connected with tested cable 1, and the other end of DC partial discharge measuring device 5 is connected with bleeder circuit.
DC partial discharge measuring device 5 detects the partial discharge of the first cable；Temperature measuring device 4 detects the temperature of the second cable
Degree.Partial-discharge measuring device and HFCT7 are according to 7354 standard of GB/T progress circuit connection.Circuit connection specification, meets part
Discharge measuring standard.
The working method of the present apparatus is as follows:
1) it builds measurement of partial discharge platform: forming current loop with the both ends that conducting wire 2 is shorted tested cable 1, be tested electricity
Cable 1 is grounded, and the appearance arrangement temperature transducer for being tested cable 1 uses the temperature measuring device 4 of thermocouple, is connected in tested circuit
High voltage direct current exports device 6, load current stacking apparatus 3 and DC partial discharge measuring device 5, DC partial discharge measurement dress
5 are set to be tested by HFCT7 connection on the ground line of cable 1；
2) rated load is superimposed in cable loop: starting load current stacking apparatus 3, to tested cable loop superposition
Upper specified operating load electric current, and recognized after stablizing to temperature by 4 real-time monitoring cable loop temperature of temperature measuring device
Rated temperature and stable is also up to for tested cable loop conductor temperature；
3) DC boosting is carried out in cable loop: being opened high voltage direct current output device 6 to circuit and is applied DC voltage,
When carrying out DC boosting in cable loop, boost operations are carried out according to GB/T 7354, dc voltage boost should boost step by step, by
In the DC Partial Discharge the characteristics of, dc voltage boost should not be too fast, and the duration of every level-one is not shorter than 2 minutes, after boosting, operation
The DC partial discharge of cable loop in the case of on-load is tested and be recorded in DC partial discharge measuring device 5, if not detecting
It discharges to repeatability, then continues to boost, until just no longer boosting after repeatability electric discharge is recorded；
4) insulation defect judges: DC partial discharge measuring device 5 judges whether HFCT7 is coupled to local discharge signal,
When HFCT7 is coupled to signal, DC partial discharge measuring device 5 shows local discharge signal, and it is exhausted to judge that tested cable 1 exists
Edge defect is then tested cable 1 and insulation defect is not present when HFCT7 is not coupled to signal.
As shown in Fig. 2, being detected by making 8 stress cone dislocation defects of connector, to misplace, 15mm is tested, superposition
Load current carries out the measurement of shelf depreciation under DC voltage, can substantially reduce the discharge inception voltage of defect as the result is shown,
And discharge capacity can also substantially increase, and electric discharge also will be more stable, be more favorable for the measurement of partial discharge of direct current cables 1.
Figure 1 above, a kind of direct current cables local discharge detection device is specific embodiment of the utility model shown in 2,
The utility model in essence feature and progress have been embodied, needs can have been used according to actual, in the enlightenment of the utility model
Under, the equivalent modifications of shape, structure etc., the column in the protection scope of this programme are carried out to it.
Claims (5)
1. a kind of direct current cables local discharge detection device, it is characterised in that: including high voltage direct current output device (6), load electricity
Flow stacking apparatus (3), first terminal, second terminal, connection first terminal and second terminal conducting wire (2), tested for detecting
The DC partial discharge measuring device (5) of cable (1) Partial discharge signal, the temperature for detecting tested cable (1) temperature measure dress
The connector (8) set (4) and be set to tested cable (1) middle position；The DC partial discharge measuring device (5), temperature are surveyed
Amount device (4) is respectively arranged on the tested cable (1) of connector two sides；It includes AC boosting device, multiplication of voltage that high voltage direct current, which exports device (6),
The output end of rectification circuit, current-limiting resistance, high voltage direct current output device (6) is connected by first terminal with tested cable (1)；It is negative
The output end of charged current stacking apparatus (3) is connected by current transformer with conducting wire (2)；Conducting wire (2) one end and first terminal phase
Even, the other end of conducting wire (2) is connected with second terminal；The tested cable (1) includes that the first tested cable and second are tested
One end of cable, the first tested cable is connected with first terminal, and the other end of the first tested cable is tested by connector and second
One end of cable is connected, and the other end of the second tested cable is connected with second terminal；Axis of the stress cone of connector in tested cable
It is biased on position.
2. a kind of direct current cables local discharge detection device according to claim 1, it is characterised in that: connection first is tested
It is 10~20mm that the transition joint of cable, the second tested cable deviates intermediate mounting distance on axial position.
3. a kind of direct current cables local discharge detection device according to claim 2, it is characterised in that: high voltage direct current output
Device (6) parallel connection bleeder circuit, described DC partial discharge measuring device (5) one end is by High Frequency Current Sensor and is tested
Cable (1) is connected, and the other end of DC partial discharge measuring device (5) is connected with bleeder circuit.
4. a kind of direct current cables local discharge detection device according to claim 3, it is characterised in that: DC partial discharge
Measuring device (5) detects the partial discharge of the first cable；Temperature measuring device (4) detects the temperature of the second cable.
5. a kind of direct current cables local discharge detection device according to claim 1, it is characterised in that: temperature measuring device
(4) temperature transducer uses thermocouple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821058325.5U CN208937675U (en) | 2018-07-05 | 2018-07-05 | A kind of direct current cables local discharge detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821058325.5U CN208937675U (en) | 2018-07-05 | 2018-07-05 | A kind of direct current cables local discharge detection device |
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| Publication Number | Publication Date |
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| CN208937675U true CN208937675U (en) | 2019-06-04 |
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| CN201821058325.5U Active CN208937675U (en) | 2018-07-05 | 2018-07-05 | A kind of direct current cables local discharge detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624445A (en) * | 2020-04-29 | 2020-09-04 | 珠海一多监测科技有限公司 | Partial discharge detection method and system based on infrared temperature measurement sensor |
-
2018
- 2018-07-05 CN CN201821058325.5U patent/CN208937675U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624445A (en) * | 2020-04-29 | 2020-09-04 | 珠海一多监测科技有限公司 | Partial discharge detection method and system based on infrared temperature measurement sensor |
| CN111624445B (en) * | 2020-04-29 | 2023-06-09 | 珠海一多监测科技有限公司 | Partial discharge detection method and system based on infrared temperature sensor |
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