CN104391168A - System and method for inspecting grounding current of accessories of single-core cable having voltage grade above 35kV - Google Patents
System and method for inspecting grounding current of accessories of single-core cable having voltage grade above 35kV Download PDFInfo
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- CN104391168A CN104391168A CN201410736261.XA CN201410736261A CN104391168A CN 104391168 A CN104391168 A CN 104391168A CN 201410736261 A CN201410736261 A CN 201410736261A CN 104391168 A CN104391168 A CN 104391168A
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Abstract
The invention discloses a system and a method for inspecting the grounding current of accessories of a single-core cable having a voltage grade above 35kV, wherein the inspection system comprises a spot power supply device, a current sensor, a data processing device, a wireless data transmitting module and a power supply module, wherein the spot power supply device is an open-loop high-voltage sensing power supply device; the current sensor is mounted on a ground wire of a cable accessory and used for measuring the grounding current; the data processing device comprises an A/D converting circuit and a single chip; the A/D converting circuit is used for performing A/D conversion on the grounding current measured by the current sensor and transmitting the converted grounding current to the single chip; the single chip is used for processing and analyzing the data; the wireless data transmitting module is connected with the single chip and used for transmitting the data processed and analyzed by the single chip to an inspection receiving module arranged at a well opening; an input end of the power supply module is connected with a lead of a coil of the spot power supply device; an output end of the power supply module is used for providing power for other devices. A worker can measure the grounding current of an outer protective layer of the cable during route inspection by using handheld equipment without going down to the well, so the workload of operation and maintenance workers can be greatly relieved.
Description
Technical field
The present invention relates to a kind of cable Daily Round Check system and method for inspecting, specifically 35kV and above single core cable annex ground current cruising inspection system and method for inspecting.
Background technology
Current, to the measurement of 110kV and the daily tour of above cable mainly external sheath grounding current.According to regulations such as Guo Wang companies " power transmission and transformation equipment state overhauling testing regulations ", the cycle maked an inspection tour by 220kV cable is 3 months.In actual O&M, everyone administrative cable machinery is numerous, and running environment is complicated, and workload is larger.Part pipe trench ponding is serious, and testing staff cannot descend well measurements.In addition, Partial joints well location, in fast traffic lane, when carrying out DATA REASONING, needs on fast traffic lane, establish enclosing, drives a well mouth, there is certain potential safety hazard.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the object of the present invention is to provide a kind of 35kV and above single core cable annex ground current cruising inspection system and method for inspecting, staff passes through handheld device, the measurement to protective coverings of cable ground current can be realized in path is maked an inspection tour, without the need to going into the well, greatly alleviate operation maintenance personnel workload.
In order to solve the problem, 35kV provided by the invention and above single core cable annex ground current cruising inspection system, comprising:
On-the-spot electricity getting device is open loop type high voltage induction electricity getting device; This open loop type high-voltage power transmission device comprises iron core, coil; Described iron core is annular core, and this annular core is made up of two semicircle iron cores, is provided with space between two mutual corresponding end faces of semicircle iron core; Described coil is that a wire is entwined, and the two ends of wire are the head and the tail two ends of coil, and lead-in wire is drawn at the head and the tail two ends of coil;
Current sensor, for being installed in cable accessory ground wire, measures ground current;
Data processing equipment, comprises A/D change-over circuit and single-chip microcomputer, and A/D change-over circuit transfers to single-chip microcomputer after carrying out A/D conversion to the ground current that current sensor records; Single-chip microcomputer processes data and analyzes;
Wireless data transmission module, connects single-chip microcomputer, and what single-chip microcomputer process and the data after analyzing are sent to well head place patrols and examines receiver module;
Power module, input end connects the lead-in wire of the coil of on-the-spot electricity getting device; Output terminal is data processing equipment, wireless data transmission module provides power supply.
As the further technical scheme of this cruising inspection system, in described open loop type high-voltage power transmission device, the gap length between two mutual corresponding end faces of semicircle iron core is 0.3mm; The internal diameter of described annular core is 150mm, and external diameter is 220mm.
Further technical scheme, in described open loop type high-voltage power transmission device, annular core is provided with the hold assembly for clamping cable, described hold assembly is provided with at least three groups, often organize hold assembly and comprise a base, a grip block, described base is provided with the track of the bottom plug-in mounting for grip block, the cartridge insertion direction of track is parallel with the axis of annular core; Many groups hold assembly is uniform around the circumference of annular core.
Present invention also offers the 35kV based on above-mentioned cruising inspection system and above single core cable annex ground current method for inspecting, the steps include:
Open loop high-voltage power transmission device is installed on cable, realizes induction power taking;
Current sensor, is installed on cable accessory ground wire, measures ground current;
The ground current measured transfers to single-chip microcomputer after the conversion of A/D change-over circuit, single-chip microcomputer carries out data process&analysis, be sent to well head place by wireless data transmission module again, the hand-held wireless data transmission module of operations staff can obtain ground current data at well head place.
The invention has the beneficial effects as follows: gather and emission coefficient at cable accessory installation data, staff, by handheld device, can realizing the measurement to protective coverings of cable ground current, without the need to going into the well, greatly alleviating operation maintenance personnel workload in path is maked an inspection tour.In addition, native system also can be functions such as realizing annex ground current the inquiry of historical data, data analysis and provides basis, can diagnose cable operation conditions.This equipment adopts modular design, is convenient to the access of other cable pipe trench and cable electrical comprehensive information detection system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is described further:
Fig. 1 is the circuit structure block diagram of the embodiment of the present invention;
Fig. 2 is the structural representation of open loop type high-voltage power transmission device in the embodiment of the present invention;
In figure: 1 annular core, 2 coils, 3 spaces, 4 lead-in wires, 5 hold assemblies, 51 bases, 511 tracks, 52 grip blocks.
Embodiment
As shown in Figure 1, this 35kV and above single core cable annex ground current cruising inspection system, mainly comprise on-the-spot electricity getting device, power module, current sensor, data processing equipment, wireless data transmission module, wireless data transmission module.
Described on-the-spot electricity getting device is open loop type high voltage induction electricity getting device.As shown in Figure 2, this open loop type high-voltage power transmission device comprises iron core, coil 2; Described iron core is annular core 1, and this annular core 1 is made up of two semicircle iron cores, is provided with space 3 between two mutual corresponding end faces of semicircle iron core; Described coil 2 is that a wire is entwined, and the two ends of wire are the head and the tail two ends of coil, and lead-in wire 4 is drawn at the head and the tail two ends of coil 2.Annular core 1 in this open loop high-voltage power transmission device does not close, and the magnetic resistance in space is much larger than ferromagnetic material, and the eddy current of generation is less, generates heat less, solves the problem that traditional iron core-closed heating is serious.When wherein opening part space 3 should ensure to meet dielectric voltage withstand, little as far as possible, ensure field circuit.
The further technology that this cruising inspection system is taked, in described open loop type high-voltage power transmission device, space 3 width between two mutual corresponding end faces of semicircle iron core is 0.3mm; The internal diameter of described annular core 1 is 150mm, and external diameter is 220mm.
Further technology, in described open loop type high-voltage power transmission device, annular core 1 is provided with the hold assembly 5 for clamping cable, described hold assembly 5 is provided with at least three groups, often organize hold assembly and comprise a base 51, grip block 52, described base 51 is provided with the track 511 of the bottom plug-in mounting for grip block 52, the cartridge insertion direction of track 511 is parallel with the axis of annular core; Many groups hold assembly 5 is uniform around the circumference of annular core 1.
Described current sensor, for being installed in cable accessory ground wire, measures ground current.
In native system, current sensor adopts flexible mutual inductor, coil is not containing saturation element, the linearity is good, and demarcate easily, transient response ability is given prominence to, current range to be measured is large, can from 10mA to 1MA, phase difference error is less than 0.1 degree, standard coil insulation voltage > 1000V, plus high-pressure sleeve pipe insulation voltage can reach 10kV, the dangerous and overload danger without second open circuit.
Current sensor index of correlation is as follows.
Table 3 current sensor index
Described data processing equipment, comprises A/D change-over circuit and single-chip microcomputer, and A/D change-over circuit transfers to single-chip microcomputer after carrying out A/D conversion to the ground current that current sensor records; Single-chip microcomputer processes data and analyzes.
Described wireless data transmission module, connects single-chip microcomputer, and what single-chip microcomputer process and the data after analyzing are sent to well head place patrols and examines receiver module.
Send mode can be response formula or respond to from trigger-type, response formula is exactly arrive assigned address patrol officer to assign a data transmission instruction to wireless data transmission module, wireless data transmission module upon receipt of the instructions, data (such as, data, the instantly instant data etc. in a nearest week) are sent according to the requirement of instruction; Responding to from triggering mode is exactly that when patrolling and examining, it hand-held patrol and examine receiver module and automatically can be identified by wireless data transmission module patrol officer, and connects, once successful connection, wireless data transmission module will be patrolled and examined receiver module from trend and be sent data.
Patrol and examine the terminal device that receiving trap is built-in receiving antenna, generally secondary development can form on panel computer, onboard data displaying, inquiry, statistical software.
Described power module, input end connects the lead-in wire of the coil of on-the-spot electricity getting device; Output terminal is data processing equipment, wireless data transmission module provides power supply.
Based on 35kV and the above single core cable annex ground current method for inspecting of above-mentioned cruising inspection system, the steps include:
Open loop high-voltage power transmission device is installed on cable, realizes induction power taking;
Current sensor, is installed on cable accessory ground wire, measures ground current;
The ground current measured transfers to single-chip microcomputer after the conversion of A/D change-over circuit, single-chip microcomputer carries out data process&analysis, be sent to well head place by wireless data transmission module again, the hand-held wireless data transmission module of operations staff can obtain ground current data at well head place.
Comparatively traditional cable outer jacket ground current monitoring mode, this cruising inspection system mainly contains following characteristics.
1. maintenance work amount greatly reduces, and can realize measuring cable grounding electric current and load current without the need to going into the well, and improves operation maintenance personnel work efficiency, shortens measuring period, improves cable operational monitoring rate.
2. data processing function is powerful, can realize the prediction and evaluation to protective coverings of cable operation conditions.Process the outer jacket ground current obtained, generating run condition curve, sets up cable running state data storehouse, for the operation management of cable provides data supporting.
3. modular design, flexibility ratio is high.According to the needs of operations staff, system can be customized.As, by increasing sensor, can realize measuring the integrated information of cable pipe trench, as pipe trench composition of gases within, the measurement of the information such as temperature.
4. measurement data contains geography and temporal information, and patrol and detection personnel put in place situation.
Claims (4)
1.35kV and above single core cable annex ground current cruising inspection system, is characterized in that, comprising:
On-the-spot electricity getting device is open loop type high voltage induction electricity getting device; This open loop type high-voltage power transmission device comprises iron core, coil; Described iron core is annular core, and this annular core is made up of two semicircle iron cores, is provided with space between two mutual corresponding end faces of semicircle iron core; Described coil is that a wire is entwined, and the two ends of wire are the head and the tail two ends of coil, and lead-in wire is drawn at the head and the tail two ends of coil;
Current sensor, for being installed in cable accessory ground wire, measures ground current;
Data processing equipment, comprises A/D change-over circuit and single-chip microcomputer, and A/D change-over circuit transfers to single-chip microcomputer after carrying out A/D conversion to the ground current that current sensor records; Single-chip microcomputer processes data and analyzes;
Wireless data transmission module, connects single-chip microcomputer, and what single-chip microcomputer process and the data after analyzing are sent to well head place patrols and examines receiver module;
Power module, input end connects the lead-in wire of the coil of on-the-spot electricity getting device; Output terminal is data processing equipment, wireless data transmission module provides power supply.
2. the 35kV as requested described in 1 and above single core cable annex ground current cruising inspection system, is characterized in that, in described open loop type high-voltage power transmission device, the gap length between two mutual corresponding end faces of semicircle iron core is 0.3mm; The internal diameter of described annular core is 150mm, and external diameter is 220mm.
3. the 35kV as requested described in 1 or 2 and above single core cable annex ground current cruising inspection system, it is characterized in that, in described open loop type high-voltage power transmission device, annular core is provided with the hold assembly for clamping cable, described hold assembly is provided with at least three groups, often organize hold assembly and comprise a base, a grip block, described base is provided with the track of the bottom plug-in mounting for grip block, the cartridge insertion direction of track is parallel with the axis of annular core; Many groups hold assembly is uniform around the circumference of annular core.
4.35kV and above single core cable annex ground current method for inspecting, is characterized in that:
Open loop high-voltage power transmission device is installed on cable, realizes induction power taking;
Current sensor, is installed on cable accessory ground wire, measures ground current;
The ground current measured transfers to single-chip microcomputer after the conversion of A/D change-over circuit, single-chip microcomputer carries out data process&analysis, be sent to well head place by wireless data transmission module again, the hand-held wireless data transmission module of operations staff can obtain ground current data at well head place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410736261.XA CN104391168A (en) | 2014-12-04 | 2014-12-04 | System and method for inspecting grounding current of accessories of single-core cable having voltage grade above 35kV |
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| CN201410736261.XA CN104391168A (en) | 2014-12-04 | 2014-12-04 | System and method for inspecting grounding current of accessories of single-core cable having voltage grade above 35kV |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808048A (en) * | 2015-04-24 | 2015-07-29 | 河海大学常州校区 | Device and method for detecting operation state of road caution lamp |
| CN104880598A (en) * | 2015-06-17 | 2015-09-02 | 江苏省电力公司苏州供电公司 | Induced current monitor for cable sheath |
| CN105301346A (en) * | 2015-11-30 | 2016-02-03 | 国网山东省电力公司烟台供电公司 | High-voltage power transmission cable earth current automatic detection device |
| CN105448048A (en) * | 2015-12-31 | 2016-03-30 | 国网浙江省电力公司绍兴供电公司 | Grounding pile alarm device |
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| CN2472324Y (en) * | 2001-04-16 | 2002-01-16 | 上海市嘉定互感器厂 | Openable current mutual inductor |
| CN201886618U (en) * | 2010-11-19 | 2011-06-29 | 宁波电业局 | High-voltage cable metal sheath earth circulating current monitoring terminal and system |
| CN202887969U (en) * | 2012-07-26 | 2013-04-17 | 北京中凯科电电力技术有限公司 | Current transformer |
| CN103971859A (en) * | 2014-05-26 | 2014-08-06 | 国家电网公司 | Design method for cable sheath circulating-current compensation device |
| CN204479647U (en) * | 2014-12-04 | 2015-07-15 | 国家电网公司 | 35kV and above single core cable annex ground current cruising inspection system |
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Patent Citations (5)
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| CN2472324Y (en) * | 2001-04-16 | 2002-01-16 | 上海市嘉定互感器厂 | Openable current mutual inductor |
| CN201886618U (en) * | 2010-11-19 | 2011-06-29 | 宁波电业局 | High-voltage cable metal sheath earth circulating current monitoring terminal and system |
| CN202887969U (en) * | 2012-07-26 | 2013-04-17 | 北京中凯科电电力技术有限公司 | Current transformer |
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| CN204479647U (en) * | 2014-12-04 | 2015-07-15 | 国家电网公司 | 35kV and above single core cable annex ground current cruising inspection system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808048A (en) * | 2015-04-24 | 2015-07-29 | 河海大学常州校区 | Device and method for detecting operation state of road caution lamp |
| CN104880598A (en) * | 2015-06-17 | 2015-09-02 | 江苏省电力公司苏州供电公司 | Induced current monitor for cable sheath |
| CN105301346A (en) * | 2015-11-30 | 2016-02-03 | 国网山东省电力公司烟台供电公司 | High-voltage power transmission cable earth current automatic detection device |
| CN105448048A (en) * | 2015-12-31 | 2016-03-30 | 国网浙江省电力公司绍兴供电公司 | Grounding pile alarm device |
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Application publication date: 20150304 |