CN205193212U - Insulating detecting system of DC cable - Google Patents

Insulating detecting system of DC cable Download PDF

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Publication number
CN205193212U
CN205193212U CN201520857043.1U CN201520857043U CN205193212U CN 205193212 U CN205193212 U CN 205193212U CN 201520857043 U CN201520857043 U CN 201520857043U CN 205193212 U CN205193212 U CN 205193212U
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Prior art keywords
direct current
signal
monitoring host
host computer
station
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CN201520857043.1U
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Chinese (zh)
Inventor
张松光
李清波
张畅生
郭旭敏
文衍广
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Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Abstract

The utility model provides an insulating detecting system of DC cable, monitoring host in the station, and with the partial discharge collection module that monitoring host connects in standing, partial discharge collection module gathers the partial discharge signal at DC cable terminal, sends to monitoring host in standing, monitoring host is right in standing the partial discharge signal detects, and monitoring host detects in the station partial discharge in the partial discharge signal measures when being greater than predetermined partial discharge metered valve value, judges then that there is insulation fault in DC cable to the insulating degree of accuracy that detects of DC cable improves.

Description

Direct current cables Insulation Inspection System
Technical field
The utility model relates to cable insulation detection field, particularly a kind of direct current cables Insulation Inspection System.
Background technology
Along with the development of Technology of HVDC based Voltage Source Converter, the application of high voltage direct current cable in power transmission engineering is more and more extensive, is generally used for the electric power transfer between marine wind electric field and land and between continent and island.China's high voltage direct current cable insulating material research far lags behind ac cable, direct current cables Manufacturing Technology Development is immature, in addition high voltage direct current terminal is more complicated relative to cable body structure, manufacture and design difficulty larger, in whole cable system, be in insulation weak link, show according to statistics, the probability that cable accessory breaks down accounts for 70% greatly, and cable termination is as the link of key, its quality run is directly connected to the safe and stable operation of whole cable system.Direct current cables terminal is relative to traditional ac cable terminal, and its internal electric field distribution etc. all exists relatively big difference, and the detection method of ac cable can not directly apply to direct current cables Insulation monitoring.
Because China's high voltage dc transmission technology is started late, rig-site utilization experience is less, and the research being directed to direct current cables annex Insulation monitoring is relatively deficient, and the accuracy of Insulation monitoring is not ideal enough, cannot the insulation fault of detection streamer system exactly.
Utility model content
For the problem that the accuracy of the direct current cables Insulation monitoring existed in above-mentioned prior art is lower, the purpose of this utility model is to provide a kind of direct current cables Insulation Inspection System, can improve the accuracy of direct current cables Insulation monitoring.
A kind of direct current cables Insulation Inspection System, comprises monitoring host computer in station, and the partial discharge collection module be connected with monitoring host computer in described station;
Described partial discharge collection module gathers the local discharge signal of direct current cables terminal, sends monitoring host computer in described station to, and in standing, monitoring host computer detects described local discharge signal.
Direct current cables Insulation Inspection System of the present utility model, described partial discharge collection module gathers the local discharge signal of direct current cables terminal, send monitoring host computer in described station to, when the partial discharge quantity that monitoring host computer in standing detects in described local discharge signal is greater than default partial discharge quantity threshold values, then judge that direct current cables exists insulation fault, thus improve the accuracy of direct current cables Insulation monitoring.
Wherein in an embodiment, described partial discharge collection module comprises:
High Frequency Current Sensor, bandpass filter, the first signal amplifier and the first capture card, described High Frequency Current Sensor is connected with the first capture card by bandpass filter and the first signal amplifier.
Described High Frequency Current Sensor gathers the local discharge signal of direct current cables terminal, sends bandpass filter to; Described bandpass filter, by the signal within the scope of predeterminated frequency, filters the signal of other frequency ranges, thus improves the degree of accuracy of local discharge signal; The local discharge signal of band-pass filter amplifies by described first signal amplifier, is beneficial to the first capture card and gathers high-precision local discharge signal.Therefore this embodiment improves the degree of accuracy of the local discharge signal of collection.
Wherein in an embodiment, also comprise:
The temperature collect module be connected with monitoring host computer in described station, described temperature collect module gathers the analog temperature signal of direct current cables terminal, and described analog temperature signal is converted into digital temperature signal, send monitoring host computer in described station to, when in standing, monitoring host computer detects that the temperature of direct current cables terminal end surface is greater than default threshold temperature, judge that direct current cables exists insulation fault, thus improve the accuracy of direct current cables Insulation monitoring further.
Wherein in an embodiment, described temperature collect module comprises:
First temperature sensor, described first temperature sensor is arranged on the surface of described direct current cables terminal, gather the analog temperature signal of direct current cables terminal end surface, and the analog temperature signal on described surface is converted into the first digital temperature signal, send monitoring host computer in described station to.
Be arranged on the first temperature sensor of described direct current cables terminal end surface, the analog temperature signal of the direct current cables terminal end surface collected is more accurate.
Wherein in an embodiment, the quantity of described first temperature sensor is at least two, is arranged on the diverse location of described direct current cables terminal end surface.
At least two the first temperature sensors are arranged on the diverse location of described direct current cables terminal end surface, gather the temperature signal of diverse location, thus improve the degree of accuracy of temperature signal further.
Wherein in an embodiment, described temperature collect module also comprises:
Second temperature sensor, described second temperature sensor is arranged in the environment near described direct current cables terminal end surface, gathers the temperature signal in environment near described direct current cables terminal end surface.
Wherein in an embodiment, also comprise:
Hydraulic pressure acquisition module, described hydraulic pressure acquisition module comprises interconnective hydraulic pressure transducer and analog to digital converter further;
Described hydraulic pressure transducer is arranged in direct current cables terminating insulation oil-piping, and gather the simulation fuel injection pressure signal of direct current cables terminal, described simulation fuel injection pressure signal is converted into digital fuel injection pressure signal by described analog to digital converter, and sends monitoring host computer in described station to.
When the oil pressure that monitoring host computer in standing detects in direct current cables terminating insulation oil-piping is greater than default oil pressure threshold values, judges that direct current cables exists insulation fault, thus improve the accuracy of direct current cables Insulation monitoring further.
Wherein in an embodiment, also comprise:
The DC current acquisition module be connected with monitoring host computer in described station, described DC current acquisition module gathers the direct current leakage current signal of direct current cables terminal, sends monitoring host computer in described station to.
When monitoring host computer detects that the direct current leakage electric current of direct current cables terminal is greater than default direct current leakage current threshold in standing, judge that direct current cables exists insulation fault, thus improve the accuracy of direct current cables Insulation monitoring further.
Wherein in an embodiment, described DC current acquisition module comprises:
DC current sensor, low-pass filter, secondary signal amplifier and the second capture card, described DC current sensor is connected with the second capture card by low-pass filter and secondary signal amplifier.
Described DC current sensor gathers the direct current leakage current signal of direct current cables terminal, and described low-pass filter effectively can filter the high frequency harmonic components in direct current leakage current signal, thus improves the degree of accuracy of direct current leakage current signal; The direct current leakage current signal filtered through low-pass filter amplifies by described secondary signal amplifier, is beneficial to the second capture card and gathers high-precision direct current leakage current signal.Therefore this embodiment improves the degree of accuracy of the direct current leakage current signal of collection.
Wherein in an embodiment, also comprise:
Alarm equipment, described alarm equipment is connected with monitoring host computer in station, sends alarm when the various detection data in monitoring host computer in described station exceed corresponding preset value;
Query facility, described query facility is connected with monitoring host computer in station, inquires about the various detection data of monitoring host computer in described station.
Accompanying drawing explanation
Fig. 1 is the structural representation of the direct current cables Insulation Inspection System of embodiment;
Fig. 2 is the structural representation of the direct current cables Insulation Inspection System of embodiment;
Fig. 3 is the structural representation of the direct current cables Insulation Inspection System of embodiment;
Fig. 4 is the structural representation of the DC current acquisition module of embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
Refer to the structural representation of the direct current cables Insulation Inspection System of the embodiment of Fig. 1.
A kind of direct current cables Insulation Inspection System, comprises monitoring host computer 101 in station, and the partial discharge collection module 100 be connected with monitoring host computer in described station;
Described partial discharge collection module 100 gathers the local discharge signal of direct current cables terminal, sends monitoring host computer 101 in described station to, and in standing, monitoring host computer 101 detects described local discharge signal.
In the present embodiment, described partial discharge collection module 100 gathers the local discharge signal of direct current cables terminal, send monitoring host computer 101 in described station to, when the partial discharge quantity that monitoring host computer 101 in standing detects in described local discharge signal is greater than default partial discharge quantity threshold values, then judge that direct current cables exists insulation fault, thus improve the accuracy of direct current cables Insulation monitoring.
Refer to the structural representation of the direct current cables Insulation Inspection System of embodiment in Fig. 2.
Wherein in an embodiment, described partial discharge collection module 100 comprises:
High Frequency Current Sensor 200, bandpass filter 201, first signal amplifier 202 and the first capture card 203, described High Frequency Current Sensor 200 is connected with the first capture card 203 by bandpass filter 201 and the first signal amplifier 202.
Described High Frequency Current Sensor 200 gathers the local discharge signal of direct current cables terminal, sends bandpass filter 201 to; Described bandpass filter 201, by the signal within the scope of predeterminated frequency, filters the signal of other frequency ranges, thus improves the degree of accuracy of local discharge signal; The local discharge signal filtered through bandpass filter 201 amplifies by described first signal amplifier 202, is beneficial to the first capture card 203 and gathers high-precision local discharge signal, send monitoring host computer 101 in described station to.Therefore this embodiment improves the degree of accuracy of the local discharge signal of collection.
Further, described High Frequency Current Sensor 200 is clamp type structure, is sleeved on the ground wire of described direct current cables terminal, can when not power-off, just can be gathered local discharge signal by shirtsleeve operation, improve the convenience and operability that gather local discharge signal.
Further, the predeterminated frequency scope of described bandpass filter 201 is 100 KHz to 20 megahertzes, filters out the signal of other frequency ranges, improves the degree of accuracy of the local discharge signal gathered further.
Further, described first capture card 203 is high-speed collection card, improves the collecting efficiency of described local discharge signal, is connected with monitoring host computer 101 in station by pci interface, there is higher signaling rate, thus improve the receiving efficiency of monitoring host computer 101 pairs of local discharge signal data in station.
Refer to the structural representation of the direct current cables Insulation Inspection System of embodiment in Fig. 3.
Wherein in an embodiment, described direct current cables Insulation Inspection System also comprises:
The temperature collect module 303 be connected with monitoring host computer 101 in described station, described temperature collect module 303 gathers the analog temperature signal of direct current cables terminal, and described analog temperature signal is converted into digital temperature signal, send monitoring host computer 101 in described station to, when in standing, monitoring host computer 101 detects that the temperature of direct current cables terminal end surface is greater than default threshold temperature, judge that direct current cables exists insulation fault, thus improve the accuracy of direct current cables Insulation monitoring further.
Wherein in an embodiment, described temperature collect module 303 comprises:
First temperature sensor 304, described first temperature sensor 304 is arranged on the surface of described direct current cables terminal, gather the analog temperature signal of direct current cables terminal end surface, and the analog temperature signal on described surface is converted into the first digital temperature signal, send monitoring host computer 101 in described station to.
Be arranged on the first temperature sensor 304 of described direct current cables terminal end surface, make the analog temperature signal of the direct current cables terminal end surface collected more accurate.
Wherein in an embodiment, the quantity of described first temperature sensor 304 is at least two, is arranged on the diverse location of described direct current cables terminal end surface.
At least two the first temperature sensors 304 are arranged on the diverse location of described direct current cables terminal end surface, gather the temperature signal of diverse location, thus improve the degree of accuracy of temperature signal further.
Wherein in an embodiment, described temperature collect module 303 also comprises:
Second temperature sensor, described second temperature sensor is arranged in the environment near described direct current cables terminal end surface, gathers the temperature signal in environment near described direct current cables terminal end surface.
Because temperature detection is larger by extraneous thermal effect, second temperature sensor is set in the environment therefore near direct current cables terminal end surface for detecting the environment temperature near direct current cables terminal end surface, when the difference of direct current cables terminal temperature and environment temperature is greater than default transformation temperature threshold values, judge that direct current cables exists insulation fault, reduce the impact of environment temperature on result of determination, thus improve the accuracy of direct current cables Insulation monitoring further.
Further, described first temperature sensor and the second temperature sensor are DS18B20 temperature sensing module.The temperature measurement range of described DS18B20 temperature sensing module is-55 DEG C ~+125 DEG C, 9 ~ 12 A/D conversion accuracies able to programme, and thermometric resolution can reach 0.0625 DEG C, 16 bit digital quantity mode Serial output of dut temperature sign extended; Its working power both can be introduced at far-end, and parasite power mode also can be adopted to produce; Multiple described DS18B20 temperature sensing module can be parallel on 3 or 2 lines, data processor only needs a root port line just can communicate with multiple described DS18B20 temperature sensing module, the port taking data processor is less, can save a large amount of lead-in wires and logical circuit.
Further, described first temperature sensor 304 sends the digital temperature signal of conversion in described station monitoring host computer 101 by RS232 interface.
Further, described second temperature sensor 304 sends the digital temperature signal of conversion in described station monitoring host computer 101 by RS232 interface.
Wherein in an embodiment, described direct current cables Insulation Inspection System also comprises:
Hydraulic pressure acquisition module 300, described hydraulic pressure acquisition module 300 comprises interconnective hydraulic pressure transducer 301 and analog to digital converter 302 further;
Described hydraulic pressure transducer 301 is arranged in direct current cables terminating insulation oil-piping, gather the simulation fuel injection pressure signal of direct current cables terminal, described simulation fuel injection pressure signal is converted into digital fuel injection pressure signal by described analog to digital converter 302, and sends monitoring host computer 101 in described station to.
When the oil pressure that monitoring host computer 101 in standing detects in direct current cables terminating insulation oil-piping is greater than default oil pressure threshold values, judges that direct current cables exists insulation fault, thus improve the accuracy of direct current cables Insulation monitoring further.
Further, described analog to digital converter 302 is ND-6017 analog-to-digital conversion module.
Further, described analog to digital converter 302 sends the digital fuel injection pressure signal of conversion in described station monitoring host computer 101 by RS485 interface.
Wherein in an embodiment, described direct current cables Insulation Inspection System also comprises:
The DC current acquisition module 305 be connected with monitoring host computer 101 in described station, described DC current acquisition module 305 gathers the direct current leakage current signal of direct current cables terminal, sends monitoring host computer 101 in described station to.
When monitoring host computer 101 detects that the direct current leakage electric current of direct current cables terminal is greater than default direct current leakage current threshold in standing, judge that direct current cables exists insulation fault, thus improve the accuracy of direct current cables Insulation monitoring further.
Refer to the structural representation of the DC current acquisition module of embodiment in Fig. 4.
Wherein in an embodiment, described DC current acquisition module 305 comprises:
DC current sensor 400, low-pass filter 401, secondary signal amplifier 402 and the second capture card 403, described DC current sensor 400 is connected with the second capture card 403 by low-pass filter 401 and secondary signal amplifier 402.
Described DC current sensor 400 gathers the direct current leakage current signal of direct current cables terminal, and described low-pass filter 401 effectively can filter the high frequency harmonic components in direct current leakage current signal, thus improves the degree of accuracy of direct current leakage current signal; The direct current leakage current signal filtered through low-pass filter amplifies by described secondary signal amplifier 402, is beneficial to the second capture card 403 and gathers high-precision direct current leakage current signal.Therefore this embodiment improves the degree of accuracy of the direct current leakage current signal of collection.
Further, described DC current sensor 400 is the DC current sensor based on Hall effect principle, and current measuring range is 0 to 200mA.
Further, described DC current sensor 400 is clamp type structure, is sleeved on the ground wire of described direct current cables terminal.
The DC current sensor 400 of described clamp type structure, directly be sleeved on the ground wire of described direct current cables terminal, when not power-off, just can be gathered direct current leakage current signal by shirtsleeve operation, improve the convenience and operability that gather direct current leakage current signal.
Further, described second capture card 403 is high-speed collection card, improves the collecting efficiency of described direct current leakage current signal, is connected, has higher signaling rate by pci interface with monitoring host computer 102 in station.
Wherein in an embodiment, described direct current cables Insulation Inspection System also comprises:
Alarm equipment, described alarm equipment is connected with monitoring host computer in station, sends alarm when the various detection data in monitoring host computer in described station exceed corresponding preset value;
Query facility, described query facility is connected with monitoring host computer in station, inquires about the various detection data of monitoring host computer in described station.
Further, described direct current cables Insulation Inspection System also comprises display device, and described display device is connected with monitoring host computer in station, shows the various detection data of monitoring host computer in described station.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.

Claims (10)

1. a direct current cables Insulation Inspection System, is characterized in that, comprises monitoring host computer in station, and the partial discharge collection module be connected with monitoring host computer in described station;
Described partial discharge collection module gathers the local discharge signal of direct current cables terminal, sends monitoring host computer in described station to, and in standing, monitoring host computer detects described local discharge signal.
2. direct current cables Insulation Inspection System according to claim 1, is characterized in that, described partial discharge collection module comprises:
High Frequency Current Sensor, bandpass filter, the first signal amplifier and the first capture card, described High Frequency Current Sensor is connected with the first capture card by bandpass filter and the first signal amplifier.
3. direct current cables Insulation Inspection System according to claim 1, is characterized in that, also comprise:
The temperature collect module be connected with monitoring host computer in described station, described temperature collect module gathers the analog temperature signal of direct current cables terminal, and described analog temperature signal is converted into digital temperature signal, sends monitoring host computer in described station to.
4. direct current cables Insulation Inspection System according to claim 3, is characterized in that, described temperature collect module comprises:
First temperature sensor, described first temperature sensor is arranged on the surface of described direct current cables terminal, gather the analog temperature signal of direct current cables terminal end surface, and the analog temperature signal on described surface is converted into the first digital temperature signal, send monitoring host computer in described station to.
5. direct current cables Insulation Inspection System according to claim 4, is characterized in that, the quantity of described first temperature sensor is at least two, is arranged on the diverse location of described direct current cables terminal end surface.
6. direct current cables Insulation Inspection System according to claim 4, is characterized in that, described temperature collect module also comprises:
Second temperature sensor, described second temperature sensor is arranged in the environment near described direct current cables terminal end surface, gathers the temperature signal in environment near described direct current cables terminal end surface.
7. direct current cables Insulation Inspection System according to claim 1, is characterized in that, also comprise:
Hydraulic pressure acquisition module, described hydraulic pressure acquisition module comprises interconnective hydraulic pressure transducer and analog to digital converter;
Described hydraulic pressure transducer is arranged in direct current cables terminating insulation oil-piping, and gather the simulation fuel injection pressure signal of direct current cables terminal, described simulation fuel injection pressure signal is converted into digital fuel injection pressure signal by described analog to digital converter, and sends monitoring host computer in described station to.
8. direct current cables Insulation Inspection System according to claim 1, is characterized in that, also comprise:
The DC current acquisition module be connected with monitoring host computer in described station, described DC current acquisition module gathers the direct current leakage current signal of direct current cables terminal, sends monitoring host computer in described station to.
9. direct current cables Insulation Inspection System according to claim 8, is characterized in that, described DC current acquisition module comprises:
DC current sensor, low-pass filter, secondary signal amplifier and the second capture card, described DC current sensor is connected with the second capture card by low-pass filter and secondary signal amplifier.
10. the direct current cables Insulation Inspection System according to claim 1 to 9 any one, is characterized in that, also comprise:
Alarm equipment, described alarm equipment is connected with monitoring host computer in station, sends alarm when the various detection data of monitoring host computer in described station exceed corresponding preset value;
Query facility, described query facility is connected with monitoring host computer in station, inquires about the various detection data of monitoring host computer in described station.
CN201520857043.1U 2015-10-28 2015-10-28 Insulating detecting system of DC cable Active CN205193212U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106199362A (en) * 2016-09-18 2016-12-07 广东电网有限责任公司电力科学研究院 A kind of GIS device rapid abnormal method for detecting
CN106353657A (en) * 2016-11-28 2017-01-25 国网福建省电力有限公司 High-voltage direct current cable partial discharge intelligent monitoring device and monitoring method
CN107462815A (en) * 2017-06-26 2017-12-12 全球能源互联网欧洲研究院 A kind of cable insulation thermal breakdown voltage determines method and apparatus
CN108318786A (en) * 2017-01-18 2018-07-24 中国电力科学研究院 A kind of discrimination method and device of power distribution network cable run insulation ag(e)ing risk
CN108983048A (en) * 2018-06-01 2018-12-11 广东电网有限责任公司 Direct current cables terminating insulation performance on-line monitoring system
CN109975663A (en) * 2017-12-28 2019-07-05 西门子公司 Direct current arc fault detection method, device and system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106199362A (en) * 2016-09-18 2016-12-07 广东电网有限责任公司电力科学研究院 A kind of GIS device rapid abnormal method for detecting
CN106353657A (en) * 2016-11-28 2017-01-25 国网福建省电力有限公司 High-voltage direct current cable partial discharge intelligent monitoring device and monitoring method
CN108318786A (en) * 2017-01-18 2018-07-24 中国电力科学研究院 A kind of discrimination method and device of power distribution network cable run insulation ag(e)ing risk
CN107462815A (en) * 2017-06-26 2017-12-12 全球能源互联网欧洲研究院 A kind of cable insulation thermal breakdown voltage determines method and apparatus
CN107462815B (en) * 2017-06-26 2020-02-07 全球能源互联网欧洲研究院 Cable insulation thermal breakdown voltage determining method and device
CN109975663A (en) * 2017-12-28 2019-07-05 西门子公司 Direct current arc fault detection method, device and system
CN108983048A (en) * 2018-06-01 2018-12-11 广东电网有限责任公司 Direct current cables terminating insulation performance on-line monitoring system

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