CN104360219A - DC circuit ground fault auxiliary positioning device and method for power substation - Google Patents
DC circuit ground fault auxiliary positioning device and method for power substation Download PDFInfo
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- CN104360219A CN104360219A CN201410669720.7A CN201410669720A CN104360219A CN 104360219 A CN104360219 A CN 104360219A CN 201410669720 A CN201410669720 A CN 201410669720A CN 104360219 A CN104360219 A CN 104360219A
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Abstract
The invention discloses a DC circuit ground fault auxiliary positioning device and method for a power substation. A host computer and a wireless passive leakage current sensor are connected in a wireless communication mode, and the wireless passive leakage current sensor comprises a leakage current sensing module, a resistor and an SAW sensor module. The leakage current sensing module is connected with the resistor, and the resistor is connected with the SAW sensor module. The leakage current sensing module is mounted on an equipment power input wire with the insulation condition needing to be monitored. When currents of the detected wire is sensed by the leakage current sensing module, the currents flow through the resistor, the resistor is heated to generate temperature variation, the temperature variation can be transmitted to the SAW sensor module, and the SAW sensor module converts temperature variation signals to be radio frequency signals and sends the radio frequency signals to the host computer. The DC circuit ground fault auxiliary positioning device and method for the power substation have the advantages of being convenient and fast to mount, high in anti-interference capacity, reliable in working, low in cost and long in service life.
Description
Technical field
The present invention relates to electric substation's DC loop earth fault auxiliary locator and method.
Background technology
Straight-flow system adopts the Secondary Direct Electrical Resources having accumulator energy storage, and it provides working power to signal circuit, control system, relay protection and aut.eq. etc.Straight-flow system all adopts 110V or 220V Power supply, and the positive and negative bus of this system is floating to the earth, except insulation detection device, and, anyly in bus and each bar feed leg thereof to be linked with the earth not at all.When there is place's ground insulation fault in DC power-supply system, earth fault line and earth fault must be found out as early as possible, and get rid of immediately; Otherwise, if again there is second place's earth fault, probably cause the misoperation of main control loop, protective relaying device etc., thus cause great accident of power supply.
Existing DC power supply panel is equiped with type insulation monitoring system, can reacts the earth fault of DC loop, part plant equipment can also judge which feeder assembly has ground connection.The leakage current that can sense due to leakage current method grounding monitor sensor conventional is at present all very little, cannot directly power to wireless transport module and leakage current value data acquisition module, be thus all adopt active wired or active radio mode to transmit ground signalling.But, each DC feeder loop there is a lot of load branch, can cause in type insulation monitoring system, accessing a large amount of wires (comprising power consumption source line and signal transmission 485 lines) if each subbranch installs current existing grounding monitor sensor, add the risk that DC earthing occurs on the contrary.Also just because of this, till the grounding monitor sensor in current type insulation monitoring system is at most only installed to every bar DC feeder, cause being which equipment in which branch there occurs DC earthing and is just difficult to detect.Even if adopt hand-held leakage current checkout equipment, also must test one by one and could locate, also take time very much.Therefore, often adopt in straight-flow system generation DC earthing and draw road or draw the mode of DC insurance to search earth point.Draw road or draw the mode of DC insurance to search earth point, this method may cause the hidden danger of protective device misoperation.Thus a kind of can monitoring and the technology of fast finding straight-flow system insulation fault must be studied.
Summary of the invention
Technical matters to be solved by this invention just there is provided a kind of electric substation DC loop earth fault auxiliary locator and localization method, can monitor and fast finding straight-flow system insulation fault.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of electric substation DC loop earth fault auxiliary locator, comprise the main frame and wireless and passive leakage current sensor that are connected by radio communication, described wireless and passive leakage current sensor comprises leakage current induction module, resistance, SAW saw sensor module, described leakage current induction module is connected with described resistance, described resistance is connected with described SAW saw sensor module, described leakage current induction module is arranged on the device power supply (DPS) inlet wire that needs to monitor insulation situation, when tested wire leakage current induction module induces electric current, electric current flows through resistance, resistance heating produces temperature variation, temperature variation can be conducted to SAW saw sensor module, temperature variation signal is converted to radio frequency signal and is sent to main frame by described SAW saw sensor module.
Preferably, described main frame is provided with the radio frequency signal that wireless receiving transmitter module receives SAW saw sensor module.
Preferably, 433MHz frequency range is adopted to carry out communication between described SAW saw sensor module and wireless receiving transmitter module.
Present invention also offers a kind of electric substation DC loop earth fault assisted location method, when tested wire makes leakage current induction module induce electric current, electric current flows through resistance, resistance heating produces temperature variation, temperature variation can be conducted to SAW saw sensor module, temperature variation signal is converted to radio frequency signal and is sent to main frame by described SAW saw sensor module, main frame obtains temperature data and judges whether leakage current induction module senses the size of leakage current and leakage current by the change of temperature data, thus find earth fault.
The technical solution used in the present invention, leakage current induction module is arranged on the device power supply (DPS) inlet wire that needs to monitor insulation situation, when tested wire induces electric current, electric current flows through resistance, resistance heating produces temperature variation, temperature variation can be conducted to SAW saw sensor module, and temperature variation signal is converted to radio frequency signal and is sent to main frame by SAW saw sensor module.
Therefore, its beneficial effect brought is:
1. the application of SAW saw sensor module and wireless receiving transmitter module is passed through, by main frame and the isolation of wireless and passive leakage current sensor;
2. avoided the use of circumscripted power line or internal battery by the use of SAW surface acoustic wave techniques, have and be not electrically connected with straight-flow system, also without the trouble that the later stage is changed battery;
3. leakage current induction module is that open and close type annular realizes wire to be monitored to be placed in annular interstitial hole without the need to having a power failure;
4. the application of wireless and passive technology is grounded monitoring sensor each subbranch loop or the distributed installation of DC load end on each DC feeder loop of direct current, thus can monitor and fast finding straight-flow system insulation fault;
5. quick and easy for installation, antijamming capability is strong, and reliable operation, cost is low, the feature of long service life.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the structural representation of wireless and passive leakage current sensor;
Fig. 3 is the theory diagram of main frame.
Embodiment
As depicted in figs. 1 and 2, a kind of electric substation DC loop earth fault auxiliary locator, comprises the main frame 1 wireless and passive leakage current sensor 2 connected by radio communication.Described wireless and passive leakage current sensor comprises leakage current induction module 21, resistance 22, SAW saw sensor module 23, described leakage current induction module is connected with described resistance, described resistance is connected with described SAW saw sensor module, and described leakage current induction module is arranged on the device power supply (DPS) inlet wire that needs to monitor insulation situation.Leakage current induction module 21, resistance 22, SAW saw sensor module 23 are installed in box body 20, and box body 20 is fixed by screw 24.
As shown in Figure 3, main frame 1 comprises single chip control module 14, key-press module 11, display module 10, power module 15, wireless receiving transmitter module 16, RS485 or RJ45 communication module 12 and GPRS module 13.Power module is single chip control module, display module, RS485 or RJ45 communication module and GPRS module provide power supply.Single chip control module is connected with key-press module, display module, wireless receiving transmitter module, RS485 or RJ45 communication module and GPRS module respectively.
Described main frame is provided with the radio frequency signal that wireless receiving transmitter module receives SAW saw sensor module.433MHz frequency range is adopted to carry out communication between described SAW saw sensor module and wireless receiving transmitter module.The use of 433MHz frequency range does not need application, makes the use of wireless active Leakage Method insulation monitoring and warning device more for convenience.Carrying out communication by means of GPRS network can make the distance between main frame and other monitor terminals be expanded greatly, by means of the ripe and GPRS network of low cost, makes the cost of wireless active Leakage Method insulation monitoring and warning device have also been obtained effective control.
Leakage current induction module is arranged on the device power supply (DPS) inlet wire that needs to monitor insulation situation, when tested wire induces electric current, electric current flows through resistance, and resistance heating produces temperature variation, and temperature variation can be conducted to the piezoelectric in SAW saw sensor module.Radiofrequency signal is transmitted into the surface of the piezoelectric in SAW saw sensor module by the wireless receiving transmitter module on main frame as pumping signal, this radio frequency signal activates a surface acoustic wave by the inverse piezoelectric effect of interdigital transducer at substrate surface, surface acoustic wave is propagated along substrate, reflected to form resonance by two, left and right periodic reflective grid, the resonance frequency of this resonator is relevant with the temperature of substrate.The radio frequency signal being subject to reflected sound surface wave that temperature have impact on and being transformed into response is sent to wireless receiving transmitter module and obtains temperature data and then obtain leakage current signal by piezoelectric effect by interdigital transducer, namely judge whether leakage current induction module has the size sensing leakage current and leakage current by the change of temperature data, thus find earth fault.
Display module is for showing the leakage current signal after single chip control module process.Key-press module is used for arranging leakage current, communication and display parameter and changing.Leakage current signal can pass to other-end by RS485 or RJ45 communication module, single chip control module also by the information that RS485 or RJ45 communication module reception other-end sends over, realizes the networking of wireless and passive leakage current method DC loop earth fault aided positioning system.
Claims (4)
1. electric substation's DC loop earth fault auxiliary locator, it is characterized in that: comprise the main frame and wireless and passive leakage current sensor that are connected by radio communication, described wireless and passive leakage current sensor comprises leakage current induction module, resistance, SAW saw sensor module, described leakage current induction module is connected with described resistance, described resistance is connected with described SAW saw sensor module, described leakage current induction module is arranged on the device power supply (DPS) inlet wire that needs to monitor insulation situation, when tested wire makes leakage current induction module induce electric current, electric current flows through resistance, resistance heating produces temperature variation, temperature variation can be conducted to SAW saw sensor module, temperature variation signal is converted to radio frequency signal and is sent to main frame by described SAW saw sensor module.
2. a kind of electric substation according to claim 1 DC loop earth fault auxiliary locator, is characterized in that: described main frame is provided with the radio frequency signal that wireless receiving transmitter module receives SAW saw sensor module.
3. a kind of electric substation according to claim 2 DC loop earth fault auxiliary locator, is characterized in that: adopt 433MHz frequency range to carry out communication between described SAW saw sensor module and wireless receiving transmitter module.
4. electric substation's DC loop earth fault assisted location method, it is characterized in that: when tested wire makes leakage current induction module induce electric current, electric current flows through resistance, resistance heating produces temperature variation, temperature variation can be conducted to SAW saw sensor module, temperature variation signal is converted to radio frequency signal and is sent to main frame by described SAW saw sensor module, main frame obtains temperature data and judges whether leakage current induction module senses the size of leakage current and leakage current by the change of temperature data, thus find earth fault.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410669720.7A CN104360219A (en) | 2014-11-20 | 2014-11-20 | DC circuit ground fault auxiliary positioning device and method for power substation |
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| CN201410669720.7A CN104360219A (en) | 2014-11-20 | 2014-11-20 | DC circuit ground fault auxiliary positioning device and method for power substation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105447231A (en) * | 2015-11-15 | 2016-03-30 | 复旦大学 | Method for quickly extracting threshold voltage of field effect transistor with passive drain triple-gate structure |
| CN114062963A (en) * | 2021-10-19 | 2022-02-18 | 广西电网有限责任公司防城港供电局 | Direct current system insulation monitoring device capable of finding specific grounding point |
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| CN204177904U (en) * | 2014-11-20 | 2015-02-25 | 国家电网公司 | A kind of electric substation DC loop earth fault auxiliary locator |
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| CN1764340A (en) * | 2004-10-20 | 2006-04-26 | 中国海洋大学 | Intelligent road lamp detecting system formed by novel digital current detection sensor |
| WO2009138506A1 (en) * | 2008-05-16 | 2009-11-19 | Areva T&D Sas | Measuring the temperature inside housings of powered electric equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105447231A (en) * | 2015-11-15 | 2016-03-30 | 复旦大学 | Method for quickly extracting threshold voltage of field effect transistor with passive drain triple-gate structure |
| CN114062963A (en) * | 2021-10-19 | 2022-02-18 | 广西电网有限责任公司防城港供电局 | Direct current system insulation monitoring device capable of finding specific grounding point |
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