CN201497782U - Device for monitoring insulating property of DC operation system - Google Patents
Device for monitoring insulating property of DC operation system Download PDFInfo
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- CN201497782U CN201497782U CN2009202162236U CN200920216223U CN201497782U CN 201497782 U CN201497782 U CN 201497782U CN 2009202162236 U CN2009202162236 U CN 2009202162236U CN 200920216223 U CN200920216223 U CN 200920216223U CN 201497782 U CN201497782 U CN 201497782U
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Abstract
The utility model relates to a device for monitoring the insulating property of a DC (direct current) operation system. The device is embedded between an equipment DC switch and an equipment DC control and replay protection system, and is characterized in that a first detection unit, a second detection unit and a third detection unit are included; an input terminal of the first detection unit is connected with a positive pole of the DC switch, and an output terminal of the first detection unit is connected with a positive pole input terminal of the equipment DC control and relay protection system, so that the first detection unit can be used for detecting the insulation performance of a DC positive pole; an input terminal of the second detection unit is connected with a negative pole of the DC switch, and an output terminal of the second detection unit is connected with a negative pole input terminal of the equipment DC control and relay protection system, so that the second detection unit can be used for detecting the insulation performance of a DC negative pole; and a positive pole and a negative pole of the third detection unit are respectively connected with the positive pole and the negative pole of the DC switch, and an earthing terminal of the third detection unit is connected with an earthing bus of a control cabinet, so that the third detection unit can be used for detecting the earthing performance of the DC positive and negative poles. Therefore, with the adoption of the utility model, the DC insulation failure equipment can be automatically judged and fast found out.
Description
Technical field
The utility model relates to the electrical system monitoring device, particularly online transforming station direct current system insulating property pick-up unit.
Background technology
The direct supply of generating plant and high voltage substation is a very huge multiple-limb supply network as the emergency power supply and the control signal power supply of electric equipments, and its common faults is the one point earth fault.The dc operation system adopts the insulation against ground method of operation in the electric system; this dc operation system long-time running; often positive and negative insulation against ground all equilibrium drops to reduced levels; when one point earth takes place when; do not cause any harm, but must in time handle, otherwise; when another ground connection is taken place, might make relay protection device generation malfunction, tripping.Even can cause equipment malfunction, the tripping of adopting DC control, down to damage equipment, cause the serious consequence of large-area power-cuts, system break-down.Therefore, reduce this insulation fault, a reliable insulated monitoring method must be arranged, thereby in time pinpoint the problems, avoid the generation of major accident.
At present, known high voltage substation dc operation system direct current both positive and negative polarity insulation against ground performance monitoring device is made up of divider resistance, switch, relay, voltage table etc.Adopt voltage table to detect dc operation system both positive and negative polarity voltage-to-ground value and judge both positive and negative polarity insulation against ground performance, utilize dc operation system both positive and negative polarity voltage-to-ground difference to drive relay and send alerting signal.But such device can only detect and judge the quality of whole dc operation system insulation performance, can't search faulty equipment number and trouble spot.And in order to search the trouble spot, just must be by the direct current control system of platform stoppage in transit high-tension apparatus, perhaps segmentation stoppage in transit dc bus.When the direct current control system was stopped transport, there was serious potential safety hazard in the equipment relay protection system with ineffective concerning high-pressure system.
The utility model content
The utility model proposes in order to address the above problem, its purpose is to provide a kind of dc operation system insulation performance monitoring device, this insulating property monitoring device embeds and is arranged between equipment dc switch and equipment DC control and the relay protection system, it is characterized in that comprising: input end connects the positive pole of described dc switch, and the electrode input end of output terminal connection device DC control and relay protection system is with first detecting unit of the insulating property that are used to detect direct-flow positive pole; Input end connects the negative pole of described dc switch, and the negative input of output terminal connection device DC control and relay protection system, with second detecting unit of the insulating property that are used to detect the direct current negative pole; Both positive and negative polarity connects the both positive and negative polarity of dc switch respectively, and earth terminal connects the switch board ground strap, with the 3rd detecting unit of the ground connection performance that is used to detect the direct current both positive and negative polarity.
The utility model also comprises the switch of the both positive and negative polarity of the both positive and negative polarity of connection device dc switch respectively and equipment DC control and relay protection system.
The utility model also comprises and is used to connect described first detecting unit or described second detecting unit and the direct supply input panel of described equipment dc switch and the direct supply output wiring board that is used to be connected described first detecting unit or described second detecting unit and described equipment DC control and relay protection system.
Described first detecting unit and second detecting unit comprise the light emitting diode that relay and series connection with it connect respectively, and when the current value by relay during greater than 8mA, described light emitting diode is lighted.
Described first detecting unit and second detecting unit comprise the overcurrent protective circuit of voltage regulation respectively.
Can judge quickly and accurately according to dc operation system insulation performance monitoring device of the present utility model and to find out the direct current faulty equipment; can avoid in the past straight-flow system when searching fault; whole section bus institute carrying device control system is out of service, and relay protection system is ineffective and high-pressure system is caused serious potential safety hazard.
Description of drawings
By the description of carrying out below in conjunction with the accompanying drawing that an example exemplarily is shown, above-mentioned and other purposes of the present invention and characteristics will become apparent, wherein:
Fig. 1 is the simplified diagram according to dc operation system insulation performance monitoring device of the present utility model;
Fig. 2 is the concise and to the point circuit diagram according to dc operation system insulation performance monitoring device of the present utility model.
Main symbol description: 100 is the equipment dc switch; 110 is first detecting unit; 120 is second detecting unit; 130 is the 3rd detecting unit; 140a is first switch; 140b is second switch; 150 is equipment DC control and relay protection system; J1, J2, J3 are relay; D3, D7 are light emitting diode; D9 is a pilot lamp.
Embodiment
Below, describe preferred embodiment of the present utility model in detail with reference to accompanying drawing.Those skilled in the art should know: embodiment that this instructions is put down in writing and accompanying drawing only are preferred embodiment of the present utility model, do not represent whole technological thought of the present utility model, therefore also have alternative various embodiment.
Dc operation system insulation performance monitoring device of the present utility model is arranged in the high-tension apparatus switch board of straight-flow system; as shown in Figures 1 and 2; this dc operation system insulation monitoring device is arranged between equipment dc switch 100 and equipment DC control and the relay protection system 150, comprises shell (not shown), first detecting unit 110, second detecting unit 120, the 3rd detecting unit 130 and first, second switch 140a, 140b.Described first detecting unit 110 is arranged in the described shell (not shown); its input end connects the positive pole of described equipment dc switch 100; and the positive pole of its output terminal connection device DC control and relay protection system 150, to be used to detect the insulating property of direct-flow positive pole.Described second detecting unit 120 is arranged in the described shell (not shown); its input end connects the negative pole of described equipment dc switch 100; and the negative pole of its output terminal connection device DC control and relay protection system 150, to be used to detect the insulating property of direct current negative pole.Described the 3rd detecting unit 130 is arranged in the described shell (not shown), and its both positive and negative polarity connects the both positive and negative polarity of dc switch 100 respectively, and earth terminal connection switch board ground strap, to be used to detect the ground connection performance of direct current both positive and negative polarity.The both positive and negative polarity of described first, second switch 140a, 140b difference connection device dc switch 100 and the both positive and negative polarity of equipment DC control and relay protection system 150 are to be used for optionally using described first detecting unit 110 or second detecting unit 120 to detect.So, when the described first switch 140a disconnects, and during the described second switch 140b conducting, described first detecting unit 110 and described the 3rd detecting unit work; When the described first switch 140a conducting, and the described second switch 140b is when disconnecting, described second detecting unit 120 and the 3rd detecting unit work.Hence one can see that, and disconnection by switch 140a, 140b and conducting can be controlled dc operation system insulation performance monitoring device of the present utility model and devote oneself to work or withdraw from use.Those skilled in the art should know: only keep any one detecting unit in described first, second, third detecting unit, this detecting unit still can be worked.The utility model also comprises direct supply input panel and direct supply output wiring board (not shown), and described thus first detecting unit 110 and second detecting unit 120 can be connected by described direct supply input panel and described direct supply output wiring board and equipment dc switch 100 and equipment DC control and relay protection system 150.At this; those skilled in the art should know; first detecting unit 110 and second detecting unit 120 are connected with the terminal block that passes through that the connected mode of described equipment dc switch 100 and equipment DC control and relay protection system is not restricted in the present embodiment, can adopt various connected modes as required.
As shown in Figure 2, described first detecting unit 110 comprises relay J 1, resistance R 1, R2, controllable silicon T1, stabilivolt D4, commutation diode D1, D2, light emitting diode D3.Described relay J 1 is for doing yellow relay, the positive pole of its anodal connection device dc switch 100, when the electric current that passes through during greater than predetermined value, it often opens the output contact closure and turning circuit, and when the electric current that passes through during less than predetermined value, it is often opened output contact and remains unchanged and continue disconnecting circuit.Described resistance R 1 is connected in series with described relay J 1, as the current-limiting resistance of circuit.Described light emitting diode D3 connects with described resistance R 1, and when the electric current that passes through caused relay J 1 turning circuit greater than predetermined value, it was lighted, and gives the user to report to the police.Described stabilivolt D4 and described relay J 1, resistance R 1, light emitting diode D3 are connected in parallel.Described commutation diode D1, D2 and resistance R 2 are connected in series, and described commutation diode D1, D2, resistance R 2 and described stabilivolt D4 are connected in parallel.Described silicon controlled positive pole is connected in the positive pole of described commutation diode D1, and negative pole is connected in the negative pole of described stabilivolt D4, and the control utmost point is connected in an end of resistance R 2.Described resistance R 2 is the current-limiting resistance of thyristor gating circuit.Thus, described commutation diode D1, D2, stabilivolt D4, resistance R 2, controllable silicon T1 form overcurrent, the protective circuit of voltage regulation of first detecting unit 110.When isolating switch suits lock when operation, the electric current that the observation circuit both positive and negative polarity passes through is big (generally greater than 5A), might damage relay J 1 this moment or causes the misoperation of relay J 1 and report to the police.The utility model utilizes overcurrent, protective circuit of voltage regulation to carry out bypass by the big electric current that installs overcurrent, protective circuit of voltage regulation additional and will produce when suiting lock, has improved the stability of equipment thus.
As shown in Figure 2, described second detecting unit 120 comprises relay J 2, resistance R 3, R4, controllable silicon T2, stabilivolt D8, commutation diode D5, D6, light emitting diode D7.Described relay J 2 is for doing yellow relay; the negative pole of its anodal connection device dc switch 100 equipment DC control and relay protection system 150; when the electric current that passes through during greater than predetermined value; it often opens the output contact closure and turning circuit; and when the electric current that passes through during less than predetermined value, it is often opened output contact and remains unchanged and continue disconnecting circuit.Described resistance R 4 is connected in series with described relay J 2, as the current-limiting resistance of circuit.Described light emitting diode D7 connects with described resistance R 4, and when the electric current that passes through caused relay J 2 turning circuits greater than predetermined value, it was lighted, and gives the user to report to the police.Described stabilivolt D8 and described relay J 2, resistance R 4, light emitting diode D7 are connected in parallel.Described commutation diode D5, D6 and resistance R 3 are connected in series, and described commutation diode D5, D6, resistance R 3 and described stabilivolt D8 are connected in parallel.The positive pole of described controllable silicon T2 is connected in the positive pole of described commutation diode D5, and negative pole is connected in the negative pole of described stabilivolt D8, and the control utmost point is connected in an end of resistance R 3.Described resistance R 3 is the current-limiting resistance of thyristor gating circuit.Thus, described commutation diode D5, D6, stabilivolt D8, resistance R 3, controllable silicon T2 form overcurrent, the protective circuit of voltage regulation of second detecting unit 120.When isolating switch suits lock when operation, the electric current that the observation circuit both positive and negative polarity passes through is big (generally greater than 5A), might damage relay J 2 this moment or causes the misoperation of relay J 2 and report to the police.The utility model utilizes overcurrent, protective circuit of voltage regulation to carry out bypass by the big electric current that installs overcurrent, protective circuit of voltage regulation additional and will produce when suiting lock, has improved the stability of equipment thus.
As shown in Figure 2, described the 3rd detecting unit 130 comprises relay J 3, pilot lamp D9, resistance R 5, R6.Described relay J 3 is a direct current die mould relay, and the J3a among the figure represents often to open auxiliary contact, and J3b represents coil.The described auxiliary contact J3a closure of often opening when the positive pole of straight-flow system or the arbitrary electrode grounding in the negative pole is sent a switch alerting signal, and the user is given in pilot lamp D9 flicker thus to report to the police.Described pilot lamp D9 and the described auxiliary contact J3a that often opens are connected in series, by being lighted or glimmering and report to the police to the user, i.e. and turn-on power and lighted or glimmer when this often opens auxiliary contact J3a closure.Resistance R 5 is connected in series with resistance R 6, and R5 and R6 and describedly often open auxiliary contact J3a and pilot lamp D9 is connected in parallel.Described resistance R 5, R6 and described resistance R 1, R4 are used to be provided with current threshold, therefore can just can change threshold values by the resistance that changes described resistance as required.The resistance of described resistance R 1, R4, R5, R6 can select for use resistance potentiometer to regulate.In the present embodiment, described threshold values is respectively 4mA and 8mA, and wherein 4mA is that normal operation of straight-flow system and primary cut-out do not have the maximum threshold values of working current when suiting the lock operation, the minimum current threshold values when 8mA is the low or ground connection of straight-flow system insulating property.Thus, when the insulating property of the negative or positive electrode of straight-flow system were good, by current value＜4mA of relay J 1 or J2, light emitting diode D3 or D7, light emitting diode D3 or D7 can not lighted, and relay J 1 or J2 do not work; When the insulating property variation of the positive pole of straight-flow system or negative pole or ground connection, during the current value by relay J 1 or J2, light emitting diode D3 or D7＞8mA, light emitting diode D3 or D7 are lighted, and the normally opened contact closure of relay J 1 or J2 is sent an alerting signal thus.
Below, in conjunction with Fig. 1 and Fig. 2 the course of work according to embodiment of the present utility model is described.
Dc operation system insulation performance monitoring device according to the utility model embodiment is arranged in the high-tension apparatus switch board of straight-flow system, wherein, the input end of first detecting unit 110 is connected in the positive pole of equipment dc switch 100 by the direct current input panel, and output terminal is connected in the positive pole of equipment DC control and relay protection system by the direct current output wiring board; The input end of second detecting unit 120 is connected in the negative pole of equipment dc switch 100 by the direct current input panel, and output terminal is connected in the negative pole of equipment DC control and relay protection system by the direct current output wiring board; The both positive and negative polarity of the 3rd detecting unit 130 connects the both positive and negative polarity of dc switch 100 respectively, and earth terminal connects the switch board ground strap.The both positive and negative polarity of first, second switch 140a, 140b difference connection device dc switch 100 and the both positive and negative polarity of equipment DC control and relay protection system 150.
At first, by disconnecting described first, second switch 140a, 140b simultaneously dc operation system insulation performance monitoring device is started working.At this moment, if only disconnecting the first switch 140a then has only first detecting unit 110 can carry out work, otherwise, then have only second detecting unit can carry out work if only disconnect the second switch 140b.
Then, when the anodal insulating property of straight-flow system were good, by current value＜4mA of relay J 1, light emitting diode D3, light emitting diode D3 can not lighted, and relay J 1 can not made action yet; When the anodal insulating property variation of straight-flow system or ground connection, by current value＞8mA of relay J 1, light emitting diode D3, light emitting diode D3 is lighted, and relay J 1 is made action, and its normally opened contact closure is sent the switch alerting signal.Simultaneously, relay J 3 actions of the 3rd detecting unit 130, its normally opened contact closure, pilot lamp D9 is lighted thus.At this moment, because light emitting diode D3 and pilot lamp D3 are lighted simultaneously, the user just can judge the insulating property variation or the ground connection of straight-flow system positive pole in view of the above.
When the negative pole insulating property of straight-flow system were good, by current value＜4mA of relay J 2, light emitting diode D7, light emitting diode D7 can not lighted, and relay J 2 can not made action yet; When the negative pole insulating property variation of straight-flow system or ground connection, by current value＞8mA of relay J 2, light emitting diode D7, light emitting diode D7 is lighted, and relay J 2 is made action, and its normally opened contact closure is sent the switch alerting signal.Simultaneously, relay J 3 actions of the 3rd detecting unit 130, its normally opened contact closure, pilot lamp D9 is lighted thus.At this moment, because light emitting diode D3 and pilot lamp D3 are lighted simultaneously, the user just can judge the insulating property variation or the ground connection of straight-flow system positive pole in view of the above.
Hence one can see that, by the pilot lamp D9 that is lighted or glimmer, the user can know that the insulativity fault appears in straight-flow system, this moment, whether the user was lighted by further affirmation light emitting diode D3 or D7, it still is that the insulativity fault appears in the negative pole of straight-flow system that the insulativity fault appears in the positive pole that can judge straight-flow system rapidly, or breaks down during the positive and negative electrodes in same of straight-flow system.Those skilled in the art should know: can realize insulating monitoring with being arranged in each DC equipment according to dc operation system insulation performance monitoring device of the present utility model, and make the relay J 1 of the detecting unit in each pick-up unit, J2 signal insert PLC and controller backstage, realize in real time alert detecting and report printing automatically thus.
More than Shuo Ming embodiment only is an illustrative, rather than restrictive, and any equivalent modifications that does not break away from spirit of the present utility model and carry out or change all are contained within the claim scope of the present utility model.
Claims (5)
1. dc operation system insulation performance monitoring device, this insulating property monitoring device embeds and is arranged between equipment dc switch and equipment DC control and the relay protection system, it is characterized in that comprising:
Input end connects the positive pole of described dc switch, and the electrode input end of output terminal connection device DC control and relay protection system, with first detecting unit of the insulating property that are used to detect direct-flow positive pole;
Input end connects the negative pole of described dc switch, and the negative input of output terminal connection device DC control and relay protection system, with second detecting unit of the insulating property that are used to detect the direct current negative pole;
Both positive and negative polarity connects the both positive and negative polarity of dc switch respectively, and earth terminal connects the switch board ground strap, with the 3rd detecting unit of the ground connection performance that is used to detect the direct current both positive and negative polarity.
2. dc operation system insulation performance monitoring device according to claim 1 is characterized in that also comprising the switch of the both positive and negative polarity of the both positive and negative polarity of connection device dc switch respectively and equipment DC control and relay protection system.
3. dc operation system insulation performance monitoring device according to claim 1 is characterized in that also comprising and is used to connect described first detecting unit or described second detecting unit and the direct supply input panel of described equipment dc switch and the direct supply output wiring board that is used to be connected described first detecting unit or described second detecting unit and described equipment DC control and relay protection system.
4. dc operation system insulation performance monitoring device according to claim 1, it is characterized in that described first detecting unit and second detecting unit comprise the light emitting diode of relay and series connection with it connection respectively, when the current value by relay during greater than 8mA, described light emitting diode is lighted.
5. dc operation system insulation performance monitoring device according to claim 1 is characterized in that described first detecting unit and second detecting unit comprise the overcurrent protective circuit of voltage regulation respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202162236U CN201497782U (en) | 2009-09-17 | 2009-09-17 | Device for monitoring insulating property of DC operation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202162236U CN201497782U (en) | 2009-09-17 | 2009-09-17 | Device for monitoring insulating property of DC operation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201497782U true CN201497782U (en) | 2010-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202162236U Expired - Fee Related CN201497782U (en) | 2009-09-17 | 2009-09-17 | Device for monitoring insulating property of DC operation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201497782U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830322A (en) * | 2012-08-08 | 2012-12-19 | 重庆市电力公司万州供电局 | Voltage relay based bus grounding alarm device and alarm method thereof |
-
2009
- 2009-09-17 CN CN2009202162236U patent/CN201497782U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830322A (en) * | 2012-08-08 | 2012-12-19 | 重庆市电力公司万州供电局 | Voltage relay based bus grounding alarm device and alarm method thereof |
| CN102830322B (en) * | 2012-08-08 | 2015-12-09 | 国家电网公司 | Based on busbar grounding warning device and the alarm method thereof of voltage relay |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100602 Termination date: 20150917 |
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| EXPY | Termination of patent right or utility model |