CN203811740U - Grounding monitoring device for metal sheathes of 110 kV and more than 110 kV cables - Google Patents
Grounding monitoring device for metal sheathes of 110 kV and more than 110 kV cables Download PDFInfo
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- CN203811740U CN203811740U CN201420230661.9U CN201420230661U CN203811740U CN 203811740 U CN203811740 U CN 203811740U CN 201420230661 U CN201420230661 U CN 201420230661U CN 203811740 U CN203811740 U CN 203811740U
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- mutual inductor
- current mutual
- cable
- grounding
- sheath grounding
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Abstract
A grounding monitoring device for metal sheathes of 110 kV and more than 110 kV cables comprises an on-site monitoring terminal, a GPRS (General Packet Radio Service) wireless network and a monitoring host. The on-site monitoring terminal comprises a sheath grounding current transformer, an operation current transformer, a temperature sensor, a data collector and a GPRS module. The sheath grounding current transformer is arranged on a ground wire of a metal sheath. The operation current transformer is arranged on a cable. The temperature sensor clings to the cable. The sheath grounding current transformer, the operation current transformer and the temperature sensor are connected with a data collector. The data collector is connected with the monitoring host on the other end of the GPRS wireless network through the GPRS module. The grounding monitoring device can monitor operation state of the cable in real time to ensure reliable and stable operation of a high voltage cable line, also can reduce labor intensity of on-site measurement substantially and improve work efficiency.
Description
Technical field
The utility model relates to a kind of 110kV and above cable metal sheath grounding monitoring device.
Background technology
High-tension cable is the single-core crosslinked polyethylene insulated cable with metallic sheath, and cable metal sheath earthing mode has two kinds, and one is one end protective ground of single core cable metal sheath, the direct ground connection of the other end, and now metal sheath generation current is less than 1A left and right; The cross interconnected mode of another kind of employing is carried out ground connection, and the induction current that now cable metal sheath produces is less than 10% of running current by code General Requirements.
Chemical corrosion, the plague of rats that may occur in because of issuable mechanical damage and operational process when the oversheath of cable damage cable jacket multiple spot, cause metal sheath multipoint earthing, form circulation with the earth, the increase of shield circulating current can cause electric cable heating, loss increases severely, thereby affect the current capacity of cable, when serious, may threaten the security of operation of electric system net.On the contrary, if cable grounding system is failed effective grounding for a certain reason, the induced voltage on metal sheath will raise.The length of cable is longer, more induced voltage is higher for cable ground load current, highest induction voltage can reach volts up to ten thousand, serious threat operating maintenance personnel's personal safety, too high induced voltage also can puncture the insulation course of sheath and may cause that in breakdown point continuous discharge fire occurs, and causes grid power blackout accident.
Therefore, only have to the metal sheath electric current of 110KV and above cable monitor could be promptly and accurately discovery cable grounding system defect, guarantee the reliable and stable operation of Voltage Cable Lines Construction.
Utility model content
The purpose of this utility model is to provide a kind of 110kV and above cable metal sheath grounding monitoring device, its by the metal sheath electric current to 110KV cable monitor can be promptly and accurately discovery cable grounding system defect, guarantee the reliable and stable operation of Voltage Cable Lines Construction.
The technical scheme in the invention for solving the technical problem is: a kind of 110kV and above cable metal sheath grounding monitoring device, comprise field monitoring terminal, GPRS wireless network and monitoring host computer, described field monitoring terminal is connected by the GPRS wireless network monitoring host computer indoor with being arranged on Substation control, it is characterized in that: described field monitoring terminal comprises sheath grounding current mutual inductor, running current mutual inductor, temperature sensor, data acquisition unit and GPRS module, described sheath grounding current mutual inductor is arranged on the ground wire of metal sheath, in order to gather the ground current signal of metal sheath, described running current mutual inductor is arranged on cable, provide operating voltage in order to respond to power taking for data acquisition unit, described temperature sensor is close on cable, in order to gather cable temperature signal, described sheath grounding current mutual inductor, running current mutual inductor is connected with data acquisition unit respectively with temperature sensor, described data acquisition unit is connected with the monitoring host computer of the GPRS wireless network other end by GPRS module.
Described sheath grounding current mutual inductor and running current mutual inductor are the current transformer of magneto-optical crystal structure.
Described field monitoring terminal comprises at least 3 sheath grounding current mutual inductors, at least 3 temperature sensors and at least 1 running current mutual inductor.
Described data acquisition unit comprises current-to-voltage converting circuit, A/D convertor circuit, single-chip microcomputer, RS232 interface and induction power supply module, the input end of described current-to-voltage converting circuit is connected with sheath grounding current mutual inductor, output terminal is connected with the input end of A/D convertor circuit, the input end of described A/D convertor circuit is also connected with temperature sensor, the output terminal of A/D convertor circuit is connected with single-chip microcomputer, described single-chip microcomputer is connected with GPRS module by RS232 interface, described induction power supply module is connected with running current mutual inductor, with thinking that data acquisition unit provides operating voltage.
The beneficial effects of the utility model are: the utility model is monitored by the metal sheath electric current to 110KV cable, the defect of discovery cable grounding system that can be promptly and accurately, get final product the running status of Real-Time Monitoring cable, prevent the generation of cable insulation accident, guarantee the reliable and stable operation of Voltage Cable Lines Construction.In addition, data acquisition unit of the present utility model sends to monitoring host computer by GPRS wireless network in real time by the field data of collection, has greatly alleviated the labour intensity of in-site measurement, has improved work efficiency.
Brief description of the drawings
By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, it is more obvious that other features, objects and advantages of the present utility model will become:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of field monitoring terminal described in the utility model;
Fig. 3 is the circuit diagram of current-to-voltage converting circuit described in the utility model;
In figure: 1 sheath grounding current mutual inductor, 2 running current mutual inductors, 3 temperature sensors, 4 data acquisition units, 5 GPRS modules, 6 GPRS wireless networks, 7 monitoring host computers, 8 metallic shield grounding lines, 9 cables.
Embodiment
Disclosing below provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter the parts to specific examples and setting are described.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and object clearly, itself do not indicate the relation between discussed various embodiment and/or setting.It should be noted that illustrated parts are not necessarily drawn in proportion in the accompanying drawings.The utility model has omitted the description of known assemblies and treatment technology and technique to avoid unnecessarily limiting the utility model.
As shown in Figure 1 to Figure 3, a kind of 110kV of the present utility model and above cable metal sheath grounding monitoring device, comprise field monitoring terminal, GPRS wireless network 6 and monitoring host computer 7, described field monitoring terminal is connected by GPRS wireless network 6 monitoring host computer 7 indoor with being arranged on Substation control.Described field monitoring terminal comprises sheath grounding current mutual inductor 1, running current mutual inductor 2, temperature sensor 3, data acquisition unit 4 and GPRS module 5, described sheath grounding current mutual inductor 1, running current mutual inductor 2 is connected with data acquisition unit 4 respectively with temperature sensor 3, described sheath grounding current mutual inductor 1 is arranged on metallic shield grounding line 8, in order to gather the ground current signal of metal sheath, described running current mutual inductor 2 is arranged on cable 9, provide operating voltage in order to respond to power taking for data acquisition unit, described temperature sensor 3 is close on cable 9, in order to gather cable temperature signal, described data acquisition unit 4 is connected with the monitoring host computer 7 of GPRS wireless network 6 other ends by GPRS module 5, in order to the field data of collection is sent to monitoring host computer by GPRS wireless network in real time.
Described sheath grounding current mutual inductor 1 and running current mutual inductor 2 all adopt the current transformer of magneto-optical crystal structure.
Described field monitoring terminal comprises 1, at least 3 temperature sensors 3 of at least 3 sheath grounding current mutual inductors and at least 1 running current mutual inductor 2, at least 3 described sheath grounding current mutual inductors 1 and at least 3 temperature sensors 3 are in order to carry out grounding monitor to the metal sheath of every cable, described running current mutual inductor 2 can adopt one or in parallel multiple, is used to data acquisition unit induction power taking.
As shown in Figure 2, data acquisition unit 4 described in the utility model comprises current-to-voltage converting circuit, A/D convertor circuit, single-chip microcomputer, RS232 interface and induction power supply module, the input end of described current-to-voltage converting circuit is connected with the secondary terminals of sheath grounding current mutual inductor 1, output terminal is connected with the input end of A/D convertor circuit, the input end of described A/D convertor circuit is also connected with temperature sensor 3, the output terminal of A/D convertor circuit is connected with single-chip microcomputer, described single-chip microcomputer is connected with GPRS module by RS232 interface, described induction power supply module is connected with the secondary terminals of running current mutual inductor 2, after 2 power takings of running current mutual inductor after described induction power supply resume module with thinking that data acquisition unit provides operating voltage.
In the utility model, A/D convertor circuit is selected AD7894AR mono-10 moulds/number conversion chip, AD7894AR 1 is a low-power consumption, low cost, high performance quick 14 A/D converters, adopt 5V single power supply, sample/hold amplifier, 1 sheet internal clock and 1 HSSI High-Speed Serial Interface in built-in 1 gradual approaching/number converter, 1 sheet.Single-chip microcomputer is selected DSPTMS320F2812 chip, and RS232 interface is selected MAX232 chip.As shown in Figure 3, current-to-voltage converting circuit is made up of five resistance, electric capacity and voltage comparator UA741.
Power supply of the present utility model is supplied with and can be adopted in two ways, in the time that monitoring field can provide AC220V or DC24V, can directly utilize the power supply that scene provides to power.In the time that scene can not provide power supply, native system adopt from operation cable additional get can CT(running current mutual inductor) method carry out power taking.Get that can CT adopt can folding clamping structure current transformer, can directly be sleeved on cable, not only can directly respond to power taking from operation cable, and on operation cable without any damaging and impact.
The above is preferred implementation of the present utility model; for those skilled in the art; not departing under the prerequisite of the utility model principle, can also make some improvements and modifications, these improvements and modifications are also regarded as protection domain of the present utility model.
Claims (4)
1. a 110kV and above cable metal sheath grounding monitoring device, comprise field monitoring terminal, GPRS wireless network and monitoring host computer, described field monitoring terminal is connected by the GPRS wireless network monitoring host computer indoor with being arranged on Substation control, it is characterized in that: described field monitoring terminal comprises sheath grounding current mutual inductor, running current mutual inductor, temperature sensor, data acquisition unit and GPRS module, described sheath grounding current mutual inductor is arranged on the ground wire of metal sheath, described running current mutual inductor is arranged on cable, described temperature sensor is close on cable, described sheath grounding current mutual inductor, running current mutual inductor is connected with data acquisition unit respectively with temperature sensor, described data acquisition unit is connected with the monitoring host computer of the GPRS wireless network other end by GPRS module.
2. a kind of 110kV according to claim 1 and above cable metal sheath grounding monitoring device, is characterized in that: described sheath grounding current mutual inductor and running current mutual inductor are the current transformer of magneto-optical crystal structure.
3. a kind of 110kV according to claim 1 and above cable metal sheath grounding monitoring device, is characterized in that: described field monitoring terminal comprises at least 3 sheath grounding current mutual inductors, at least 3 temperature sensors and at least 1 running current mutual inductor.
4. according to a kind of 110kV described in claim 1-3 any one and above cable metal sheath grounding monitoring device, it is characterized in that: described data acquisition unit comprises current-to-voltage converting circuit, A/D convertor circuit, single-chip microcomputer, RS232 interface and induction power supply module, the input end of described current-to-voltage converting circuit is connected with sheath grounding current mutual inductor, output terminal is connected with the input end of A/D convertor circuit, the input end of described A/D convertor circuit is also connected with temperature sensor, the output terminal of A/D convertor circuit is connected with single-chip microcomputer, described single-chip microcomputer is connected with GPRS module by RS232 interface, described induction power supply module is connected with running current mutual inductor, with thinking that data acquisition unit provides operating voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420230661.9U CN203811740U (en) | 2014-05-07 | 2014-05-07 | Grounding monitoring device for metal sheathes of 110 kV and more than 110 kV cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420230661.9U CN203811740U (en) | 2014-05-07 | 2014-05-07 | Grounding monitoring device for metal sheathes of 110 kV and more than 110 kV cables |
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| Publication Number | Publication Date |
|---|---|
| CN203811740U true CN203811740U (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420230661.9U Expired - Fee Related CN203811740U (en) | 2014-05-07 | 2014-05-07 | Grounding monitoring device for metal sheathes of 110 kV and more than 110 kV cables |
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| CN (1) | CN203811740U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807179A (en) * | 2014-12-31 | 2016-07-27 | 保定华电电气有限公司 | Insulation monitoring device for high-voltage cable sheath |
| CN106405348A (en) * | 2016-08-30 | 2017-02-15 | 合肥智博电气有限公司 | Electric cable insulation detection apparatus collection system |
| CN109298268A (en) * | 2018-11-09 | 2019-02-01 | 深圳供电局有限公司 | A kind of high-tension cable monitoring device |
| CN109445357A (en) * | 2018-12-17 | 2019-03-08 | 江苏久创电气科技有限公司 | High voltage cable smart grounding box device |
| CN110095698A (en) * | 2019-06-18 | 2019-08-06 | 山东钢铁股份有限公司 | A kind of metallic shield grounding monitoring system and method for single-core cable |
-
2014
- 2014-05-07 CN CN201420230661.9U patent/CN203811740U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807179A (en) * | 2014-12-31 | 2016-07-27 | 保定华电电气有限公司 | Insulation monitoring device for high-voltage cable sheath |
| CN106405348A (en) * | 2016-08-30 | 2017-02-15 | 合肥智博电气有限公司 | Electric cable insulation detection apparatus collection system |
| CN109298268A (en) * | 2018-11-09 | 2019-02-01 | 深圳供电局有限公司 | A kind of high-tension cable monitoring device |
| CN109445357A (en) * | 2018-12-17 | 2019-03-08 | 江苏久创电气科技有限公司 | High voltage cable smart grounding box device |
| CN110095698A (en) * | 2019-06-18 | 2019-08-06 | 山东钢铁股份有限公司 | A kind of metallic shield grounding monitoring system and method for single-core cable |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20170507 |
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| CF01 | Termination of patent right due to non-payment of annual fee |