CN101762773A - Detection method and detection device for ground protection of high-voltage equipment - Google Patents
Detection method and detection device for ground protection of high-voltage equipment Download PDFInfo
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- CN101762773A CN101762773A CN201010011702A CN201010011702A CN101762773A CN 101762773 A CN101762773 A CN 101762773A CN 201010011702 A CN201010011702 A CN 201010011702A CN 201010011702 A CN201010011702 A CN 201010011702A CN 101762773 A CN101762773 A CN 101762773A
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Abstract
The invention relates to a detection method and a detection device for the ground protection of high-voltage equipment, which belong to the technical field of high-voltage measurement. When protective grounding is designed, auxiliary grounding is added to form a ground protection loop; an alternating-current detection signal is injected into the ground protection loop; the alternating-current detection signal injected into the loop is collected; the collected alternating-current detection signal is filtered and amplified by a signal processing unit; reference voltage is set, and the filtered and amplified detection signal is compared with the reference voltage by a comparator; and the switching-on and the switching-off of a power supply loop are controlled by signal drive. The invention can be used for detecting whether grounding is realized or not and whether the grounding is favorable or not. A protective grounding detection technique that the power can be switched on only when the grounding is favorable is realized. The condition that the equipment and an operator are injured because of the bad grounding of the equipment can be prevented, and the safety and the reliability of the equipment are enhanced.
Description
Technical field
The utility model relates to a kind of ground protection of high-voltage equipment detection technique, belongs to the High-Voltage Measurement Technology field.Be mainly used in the whether good detection of high-tension apparatus ground connection, can be used for high-tension apparatus ground connection situation is detected.
Background technology
High-tension apparatus can induce higher voltage when work, along with the rising of product voltage, moment can produce the high pressure of volts up to ten thousand, and when using high-tension apparatus, the necessary reliable and secure ground connection of equipment is with protection equipment and operating personnel's safety.Protect and expand ground detection device.
The equipment ground system that uses all belongs to passive inspection ground connection at present.Before operation, the protection of equipment ground is connected by guide wire, be grounded operation.In use run into some problems: can't judge one, whether the ground connection situation is good, not have certain quantitative criteria to judge that ground connection is good, there are potential safety hazard in operating personnel and equipment through regular meeting; Two, in emergency circumstances, the operator ignores protective ground easily in a great rush, when operate high pressure equipment, easily operating personnel and equipment are caused certain injury and loss like this at some.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of can automatic checkout equipment the whether a kind of protective ground detection method and the device of the whether good method of ground connection, ground connection.
The technical solution adopted for the present invention to solve the technical problems is: this a kind of high-tension apparatus protective ground detection method is characterized in that:
Form the ground protection loop 1.1 when design protection ground connection, increase by an auxiliary earth;
1.2 in the ground protection loop, inject alternating-current detection signal;
1.3 the alternating-current detection signal in the collection infusion circuit;
1.4 the alternating-current detection signal of gathering is carried out filtering, amplification through signal processing unit;
1.5 set a reference voltage, the detection signal after filtering, the amplification compared with it by comparer; By signal drive controlling current supply circuit break-make.
Alternating-current detection signal is injected the ground protection loop by two-stage transformer; utilize the detection signal that injects in the current transformer acquisition circuit, detection signal and reference voltage are compared, utilize the break-make of triode in the driving circuit; the work of driving relay, the break-make of control current supply circuit.
When detection signal during greater than reference voltage, comparer is output as high level, the triode conducting in the circuit, and relay work, current supply circuit is connected; When detection signal during less than reference voltage, comparer is output as low level, and current supply circuit disconnects.
Method of the present invention is to increase by an auxiliary earth to form the ground protection loop when design protection ground connection, in the ground protection loop, inject alternating-current detection signal, the alternating-current detection signal of injecting in the acquisition circuit, the alternating-current detection signal of gathering is carried out filtering, amplification through signal processing unit, set a reference voltage, the detection signal after filtering, the amplification is compared with it by comparer; By driving circuit control current supply circuit break-make.
Alternating-current detection signal is to inject the ground protection loop by two-stage transformer; utilize the detection signal that injects in the current transformer acquisition circuit, detection signal and reference voltage are compared, utilize the break-make of triode in the driving circuit; the work of driving relay, the break-make of control current supply circuit.When detection signal during greater than reference voltage, comparer is output as high level, the triode conducting in the circuit, and relay work, current supply circuit is connected; When detection signal during less than reference voltage, comparer is output as low level, and current supply circuit disconnects.
High-tension apparatus protective ground detection method pick-up unit of the present invention is characterized in that:
Comprise detection signal generation unit, signal gathering unit, signal processing unit and signal driving unit; the signal gathering unit input end links to each other with protective ground; exporting an end links to each other with the detection signal generation unit; the detection signal generation unit links to each other with auxiliary earth; the signal gathering unit output other end links to each other with signal processing unit; signal processing unit links to each other with signal driving unit; signal driving unit is exported an end and is linked to each other with ground lamp, and the signal driving unit output other end links to each other with current supply circuit.
The detection signal generation unit comprises transformer 1T1,1T2 and current-limiting resistance 1R8, protective ground and auxiliary earth adopt protective ground probe and auxiliary protection grounded probe, the input end of transformer 1T1 inserts AC220V voltage, output terminal seals in resistance 1R8, receive the input end of transformer 1T2 again, the output terminal of transformer 1T2 is received between protective ground and two grounded probes of auxiliary protection ground connection;
Signal gathering unit is made up of current transformer 1S1 and filtering circuit, the output of transformer 1T2 is received between protective ground and two grounded probes of auxiliary protection ground connection, wherein line passes the center pit of current transformer 1S1, the output signal of current transformer 1S1 is linked resistance 1R2 one end, the resistance 1R2 other end is linked 3 pin of amplifier 1N1, inserts resistance 1R1, electric capacity 1C1 and electric capacity 1C2 over the ground in current transformer 1S1 output signal and resistance 1R2 common port;
Signal processing unit comprises signal amplifier 1N1 and comparer 1N2,2 pin of signal amplifier 1N1 are linked resistance 1R3, on the 1R4, the other end ground connection of resistance 1R3, the other end of resistance 1R4 is connected to 6 pin of amplifier 1N1,6 pin of amplifier 1N1 and the common port of resistance 1R4 are connected to resistance 1R9, the other end of resistance 1R9 is linked 3 pin of comparer 1N2,2 pin of comparer 1N2 are connected to resistance 1R5, on the 1R6, the other end ground connection of resistance 1R5, the other end of resistance 1R6 is received+12V, 8 pin of comparer 1N2 are connected to+12V and process electric capacity 1C7,1C8 ground connection, resistance 1R7 one end is linked 8 pin of comparer 1N2, and the other end is linked 1 pin of comparer 1N2;
Signal driving unit comprises triode 1VT1, relay 1K1, ground lamp L1, the base stage of triode 1VT1 is connected with 1 pin of comparer 1N2, the emitter of triode 1VT1 is linked-12V, the base stage of triode 1VT1 and-insert resistance 1R10, electric capacity 1C18 between the 12V, the collector of triode 1VT1 is linked 2 pin of relay 1K1, the 7 pin connection+12V working powers of relay 1K1.
A kind of protective ground detection method compared with prior art of the present invention and the beneficial effect that device had are:
Protective ground pick-up unit of the present invention received between the protective ground probe of high pressure consumer and the auxiliary earth probe form the loop; whether ground connection, ground connection is good can initiatively to judge high-tension apparatus; cross the electric current of detection signal greatly by acquisition stream; judge the connection state of protective ground; security and reliability have been improved greatly, the safety of protection operating personnel and equipment.
Description of drawings
Fig. 1 is the functional-block diagram of a kind of protective ground detection method of the present invention and device;
Fig. 2 is the generation and the injection circuit figure of detection signal;
Fig. 3 is signal acquisition circuit figure;
Fig. 4 is signal processing circuit figure;
Fig. 5 is signal drive circuit figure.
Fig. 1-the 5th, the most preferred embodiment of a kind of protective ground detection method of the present invention and device.
Wherein: 1R1～1R10 resistance, 1C1～1C10,1C17～1C18 electric capacity, 1VD3～1VD6 diode, 1VT1 triode, 1K1 relay, 1N1 amplifier, 1N2 comparer, 1T1,1T2 transformer, 1S1 current transformer, L1 pilot lamp.
Embodiment
Below in conjunction with accompanying drawing 1-5 a kind of protective ground detection method of the present invention and device are further described:
As shown in Figure 1; the pick-up unit of a kind of protective ground detection method of the present invention is by the detection signal generation unit; signal gathering unit; signal processing unit and signal driving unit are formed; the signal gathering unit input end links to each other with protective ground; exporting an end links to each other with the detection signal generation unit; the detection signal generation unit links to each other with auxiliary earth; the signal gathering unit output other end links to each other with signal processing unit; signal processing unit links to each other with signal driving unit; signal driving unit is exported an end and is linked to each other with ground lamp, and the signal driving unit output other end links to each other with current supply circuit.The protective ground detection method handles by detection signal generation, detection signal collection, detection signal and detection signal drives realizes.Protective ground probe and auxiliary earth probe all are connected to big ground, and the alternating-current detection signal that applies is by forming the loop between protective ground and two kinds of ground connection of auxiliary earth and the earth; Utilize current transformer that this signal is gathered, handles, set a reference voltage simultaneously, reference voltage is set at 3.5V in the present embodiment, with detection signal after handling and the relatively back break-make by signal drive controlling current supply circuit of this reference voltage.
As shown in Figure 2; alternating-current detection signal produces by transformer 1T1 and transformer 1T2; the input end of transformer 1T1 inserts AC220V voltage; output terminal seals in the input end that inserts transformer 1T2 behind the resistance 1R8; the input current of limiting transformer 1T2; transformer 1T2 is that no-load voltage ratio is 1: 1 a transformer; the output of transformer 1T2 is received between protective ground and two grounded probes of auxiliary earth; two probes of protective ground and auxiliary earth insert the earth, and the alternating-current detection signal of generation is by protective ground and two probes of auxiliary earth and the earth formation loop.Wherein a line passes current transformer 1S1 center pit.
As Fig. 3, Fig. 4, shown in Figure 5, current transformer 1S1 inserts in the loop, and the alternating-current detection signal that collects is passed through amplifier 1N1, comparer 1N2, triode 1VT1, drives relay 1K1 work, the break-make of control current supply circuit.
Signal gathering unit is made up of current transformer 1S1 and filtering circuit, filtered electrical routing resistance 1R1, electrochemical capacitor 1C1, capacitor I C2 and resistance 1R2 form, the output signal of current transformer 1S1 is linked resistance 1R2 one end, the resistance 1R2 other end is linked 3 pin of amplifier 1N1, inserts resistance 1R1, electric capacity 1C1 and electric capacity 1C2 over the ground in current transformer 1S1 output signal and resistance 1R2 common port.
Signal processing unit comprises signal amplifier 1N1 and comparer 1N2.2 pin of signal amplifier 1N1 are linked resistance 1R3, on the 1R4, the other end ground connection of resistance 1R3, the other end of resistance 1R4 is connected to 6 pin of amplifier 1N1,6 pin of amplifier and the common port of resistance 1R4 are connected to resistance 1R9,3 pin of the amplifier 1N1 that the other end of resistance 1R9 is linked, 2 pin of comparer 1N2 are connected to resistance 1R5, on the 1R6, the other end ground connection of resistance 1R5, the other end of resistance 1R6 is received+12V, 8 pin of comparer 1N2 are connected to+12V and process electric capacity 1C7,1C8 ground connection, resistance 1R7 one end is linked 8 pin of comparer 1N2, and the other end is linked 1 pin of comparer 1N2.Processing signals after the amplification and a reference voltage 3.5V relatively, when processing signals during greater than reference voltage 3.5V, comparer 1N2 is output as high level; When detection signal during less than reference voltage 3.5V, comparer 1N2 is output as low level.Signal after distinguishing relatively by high-low level.
Signal driving unit comprises triode 1VT1, relay 1K1, ground lamp L1, the base stage of triode 1VT1 connects 1 pin of comparer 1N2, the emitter of triode 1VT1 is linked-12V, the base stage of triode 1VT1 and-insert resistance 1R10 between the 12V, electric capacity 1C18, the collector of triode 1VT1 is linked 2 pin of relay 1K1,7 pin of relay 1K1 are linked+12V, comparison signal after the processing by the triode 1VT1 in the driving circuit as driving switch, the 24V working power of pilot relay 1K1, and utilize the contact 1 of relay 1K1,4 control alternating current 220V loop and ground lamp L1.When ground connection was good, detection signal was output as high level greater than reference voltage 3.5V, triode 1VT1 conducting, and relay 1K1 action, ground lamp L1 extinguishes, and the alternating current 220V current supply circuit is connected.
Principle of work:
Device housings reliably is connected with protective ground.Before the use, protective ground is terminated to the protection ground of electric system or passes through the grounded probe reliable ground, auxiliary earth can not be connected protective grounding with the auxiliary earth end by grounded probe ground connection.Ground detection device need connect the alternating current 220V power supply, after the connection, produces detection signal, and detection signal injects the loop that protective ground, auxiliary earth and the earth form.The current conversion that current transformer 1S1 flows through the loop with detection is a voltage signal, with voltage signal amplify with filtering after send into comparer 1N2, with set reference voltage 3.5V compare, if protective grounding or auxiliary earth end be good earth not, then ground loop resistance is excessive, and the detection signal that comparer 1N2 produces is less than reference voltage 3.5V, be output as low level, the ground connection indicating circuit produces reports to the police, and pilot lamp L1 is bright, and current supply circuit disconnects simultaneously; If ground loop resistance is normal, the ground loop current conversion be behind the voltage signal greater than setting reference voltage 3.5V, be output as high level, drive relay 1K1 work, the ground connection indicating circuit disconnects, pilot lamp L1 extinguishes, power supply is connected, but the equipment operate as normal.Behind the equipment work, if protective ground or auxiliary earth and the earth disconnect, or the change of ground loop resistance is big, and the ground loop electric current is less than reference voltage value, and equipment cuts off the power supply automatically, quits work, and effectively guarantees equipment and personal safety.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment did, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (5)
1. high-tension apparatus protective ground detection method is characterized in that:
Form the ground protection loop 1.1 when design protection ground connection, increase by an auxiliary earth;
1.2 in the ground protection loop, inject alternating-current detection signal;
1.3 the alternating-current detection signal in the collection infusion circuit;
1.4 the alternating-current detection signal of gathering is carried out filtering, amplification through signal processing unit;
1.5 set a reference voltage, the detection signal after filtering, the amplification compared with it by comparer; By signal drive controlling current supply circuit break-make.
2. require 1 described a kind of high-tension apparatus protective ground detection method according to claim; alternating-current detection signal is injected the ground protection loop by two-stage transformer; utilize the detection signal that injects in the current transformer acquisition circuit; detection signal and reference voltage are compared; utilize the break-make of triode in the driving circuit; the work of driving relay, the break-make of control current supply circuit.
3. require 2 described a kind of high-tension apparatus protective ground detection methods according to claim, when detection signal during greater than reference voltage, comparer is output as high level, the triode conducting in the circuit, and relay work, current supply circuit is connected; When detection signal during less than reference voltage, comparer is output as low level, and current supply circuit disconnects.
4. a kind of high-tension apparatus protective ground detection method pick-up unit according to claim 1; it is characterized in that: comprise the detection signal generation unit; signal gathering unit; signal processing unit and signal driving unit; the signal gathering unit input end links to each other with protective ground; exporting an end links to each other with the detection signal generation unit; the detection signal generation unit links to each other with auxiliary earth; the signal gathering unit output other end links to each other with signal processing unit; signal processing unit links to each other with signal driving unit; signal driving unit is exported an end and is linked to each other with ground lamp, and the signal driving unit output other end links to each other with current supply circuit.
5. a kind of high-tension apparatus protective ground detection method pick-up unit according to claim 4 is characterized in that:
The detection signal generation unit comprises transformer 1T1,1T2 and current-limiting resistance 1R8, protective ground and auxiliary earth adopt protective ground probe and auxiliary protection grounded probe, the input end of transformer 1T1 inserts AC220V voltage, output terminal seals in resistance 1R8, receive the input end of transformer 1T2 again, the output terminal of transformer 1T2 is received between protective ground and two grounded probes of auxiliary protection ground connection;
Signal gathering unit is made up of current transformer 1S1 and filtering circuit, the output of transformer 1T2 is received between protective ground and two grounded probes of auxiliary protection ground connection, wherein line passes the center pit of current transformer 1S1, the output signal of current transformer 1S1 is linked resistance 1R2 one end, the resistance 1R2 other end is linked 3 pin of amplifier 1N1, inserts resistance 1R1, electric capacity 1C1 and electric capacity 1C2 over the ground in current transformer 1S1 output signal and resistance 1R2 common port;
Signal processing unit comprises signal amplifier 1N1 and comparer 1N2,2 pin of signal amplifier 1N1 are linked resistance 1R3, on the 1R4, the other end ground connection of resistance 1R3, the other end of resistance 1R4 is connected to 6 pin of amplifier 1N1,6 pin of amplifier 1N1 and the common port of resistance 1R4 are connected to resistance 1R9, the other end of resistance 1R9 is linked 3 pin of comparer 1N2,2 pin of comparer 1N2 are connected to resistance 1R5, on the 1R6, the other end ground connection of resistance 1R5, the other end of resistance 1R6 is received+12V, 8 pin of comparer 1N2 are connected to+12V and process electric capacity 1C7,1C8 ground connection, resistance 1R7 one end is linked 8 pin of comparer 1N2, and the other end is linked 1 pin of comparer 1N2;
Signal driving unit comprises triode 1VT1, relay 1K1, ground lamp L1, the base stage of triode 1VT1 is connected with 1 pin of comparer 1N2, the emitter of triode 1VT1 is linked-12V, the base stage of triode 1VT1 and-insert resistance 1R10, electric capacity 1C18 between the 12V, the collector of triode 1VT1 is linked 2 pin of relay 1K1, the 7 pin connection+12V working powers of relay 1K1.
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| CN201010011702A CN101762773B (en) | 2010-01-19 | 2010-01-19 | Detection method and detection device for ground protection of high-voltage equipment |
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| CN201010011702A CN101762773B (en) | 2010-01-19 | 2010-01-19 | Detection method and detection device for ground protection of high-voltage equipment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608485A (en) * | 2012-03-23 | 2012-07-25 | 云南电网公司 | Detection method for zero-sequence current loops of transformer substations |
| CN102928730A (en) * | 2012-10-31 | 2013-02-13 | 华东光电集成器件研究所 | Grounding detection device |
| CN103855677A (en) * | 2014-01-17 | 2014-06-11 | 凯迈(洛阳)电子有限公司 | Ground fault protection circuit of controller of eddy current retarder |
| CN106483349A (en) * | 2016-11-23 | 2017-03-08 | 国网重庆市电力公司江津供电分公司 | A kind of transformer secondary side earthing detection protection system |
| CN106707087A (en) * | 2017-02-04 | 2017-05-24 | 山西全安新技术开发有限公司 | Grounding monitoring and controlling method and system for underground electric equipment |
| CN109444635A (en) * | 2018-11-15 | 2019-03-08 | 珠海格力电器股份有限公司 | A kind of equipment ground real time monitoring apparatus |
| CN109521331A (en) * | 2018-12-18 | 2019-03-26 | 国网重庆市电力公司电力科学研究院 | A kind of power distribution network applies the automatization test system of signal generation apparatus outside |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4809123A (en) * | 1986-04-14 | 1989-02-28 | Isco, Inc. | Ground fault detector for high-voltage DC power supplies |
| IL109607A (en) * | 1994-05-10 | 1997-04-15 | Hayim Nevo | Grounding fault detection system |
| CN2232589Y (en) * | 1995-08-10 | 1996-08-07 | 苏州市四通电器厂 | Test instrument for protecting earth circuit continuous |
| CN101419265B (en) * | 2008-12-05 | 2011-04-06 | 韩俊 | Signal generating circuit for detecting protective earthing connecting status |
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2010
- 2010-01-19 CN CN201010011702A patent/CN101762773B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102608485A (en) * | 2012-03-23 | 2012-07-25 | 云南电网公司 | Detection method for zero-sequence current loops of transformer substations |
| CN102608485B (en) * | 2012-03-23 | 2014-06-11 | 云南电网公司 | Detection method for zero-sequence current loops of transformer substations |
| CN102928730A (en) * | 2012-10-31 | 2013-02-13 | 华东光电集成器件研究所 | Grounding detection device |
| CN102928730B (en) * | 2012-10-31 | 2016-01-27 | 华东光电集成器件研究所 | A kind of ground detection device |
| CN103855677A (en) * | 2014-01-17 | 2014-06-11 | 凯迈(洛阳)电子有限公司 | Ground fault protection circuit of controller of eddy current retarder |
| CN103855677B (en) * | 2014-01-17 | 2016-08-17 | 凯迈(洛阳)电子有限公司 | A kind of ground fault protection circuit of the controller of current vortex retarder |
| CN106483349A (en) * | 2016-11-23 | 2017-03-08 | 国网重庆市电力公司江津供电分公司 | A kind of transformer secondary side earthing detection protection system |
| CN106483349B (en) * | 2016-11-23 | 2019-01-22 | 国网重庆市电力公司江津供电分公司 | A kind of mutual inductor secondary side earthing detection protection system |
| CN106707087A (en) * | 2017-02-04 | 2017-05-24 | 山西全安新技术开发有限公司 | Grounding monitoring and controlling method and system for underground electric equipment |
| CN106707087B (en) * | 2017-02-04 | 2024-04-05 | 山西全安新技术开发有限公司 | Underground electrical equipment grounding monitoring method and system |
| CN109444635A (en) * | 2018-11-15 | 2019-03-08 | 珠海格力电器股份有限公司 | A kind of equipment ground real time monitoring apparatus |
| CN109521331A (en) * | 2018-12-18 | 2019-03-26 | 国网重庆市电力公司电力科学研究院 | A kind of power distribution network applies the automatization test system of signal generation apparatus outside |
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| CN101762773B (en) | 2012-09-19 |
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Owner name: SHANDONG KEHUI POWER AUTOMATION CO., LTD. Free format text: FORMER NAME: SHANDONG KEHUI ELECTRIC CO., LTD. |
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Address after: 255087 Shandong Province, Zibo city Zhangdian District Road No. 16 win Department of science and Technology Park Patentee after: SHANDONG KEHUI POWER AUTOMATION CO., LTD. Address before: 255087 Shandong Province, Zibo city Zhangdian District Fang Zhen win Road No. 16 Patentee before: Shandong Kehui Electric Co., Ltd. |