CN203135401U - AC invasion protection device for DC system of transformer substation - Google Patents
AC invasion protection device for DC system of transformer substation Download PDFInfo
- Publication number
- CN203135401U CN203135401U CN 201320154130 CN201320154130U CN203135401U CN 203135401 U CN203135401 U CN 203135401U CN 201320154130 CN201320154130 CN 201320154130 CN 201320154130 U CN201320154130 U CN 201320154130U CN 203135401 U CN203135401 U CN 203135401U
- Authority
- CN
- China
- Prior art keywords
- diode
- air switch
- protection device
- direct current
- bus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides an AC invasion protection device for a DC system of a transformer substation and belongs to the protection field. The AC invasion protection device for the DC system of the transformer substation includes a first diode, a second diode, an air switch and an AC voltage meter. A negative electrode of the first diode is connected with a positive electrode of the second diode and is then connected with a ground terminal. A positive electrode of the first diode and a negative electrode of the second diode are connected with a wire outlet terminal of the air switch. A wire inlet terminal of the air switch is connected with a DC bus. By adopting a circuit structure provided with the air switch and the diodes between the DC bus and the ground, accidents caused by the AC invasion of the DC system can be avoided effectively. By utilizing a voltage clamping effect of the diodes, relative stability of ground voltage of the DC bus is guaranteed. By utilizing auxiliary contacts of the AC voltage meter for providing warning signal contact to the external, a warning function is realized. The AC invasion protection device for the DC system of the transformer substation can be widely applied to the protection field of the DC system of the transformer substation.
Description
Technical field
The utility model belongs to the protective device field, relates in particular to a kind of protective device for transformer station direct current system.
Background technology
The transformer station direct current system transformer station direct current system plays a part very important in transformer substation assisted devices, but because the particularity of transformer station, external interference such as intrusion, DC earthing are invaded, exchanged to direct current system in the transformer station than the easier lightning wave that is subjected to of other occasions, these interference not only may damage secondary device, also may cause serious accidents such as switch mis-jumping.
Existing direct current system has solved the problem of lightning wave intrusion and DC earthing searching preferably by installing means such as lightning arrester, D.C. isolation monitoring device additional, but does not still have effective solution for exchanging to invade.
Because transformer station's 110/220V direct current system is isolated neutral system, in case for a certain reason, the alternating current component of ground connection has sealed in direct current system, will make dc bus be superimposed with a very big alternating voltage over the ground.
Along with popularizing of Microcomputer Protection and integrated-type control box; all kinds of auxiliary relays miniaturization day by day on the one hand; on the other hand because Microcomputer Protection and automation equipment use the EMI(electromagnetic interference that suppresses common mode disturbances in a large number) filter; the direct-to-ground capacitance of dc bus is increased day by day; like this; the alternating current component of invading direct current system will be applied on some auxiliary relay by cable distribution electric capacity, the bus direct-to-ground capacitance of each DC loop, thereby may cause the serious accident of switch malfunction.
Owing to 50Hz alternating current component and rheology, press the secondary current that becomes, voltage with frequently, also may produce the relatively poor protective device of some antijamming capability, automation equipment and disturb in addition, cause device damage, switch malfunction.
The utility model content
Technical problem to be solved in the utility model provides a kind of transformer station direct current system and exchanges the intrusion protection device; it adopts the circuit structure that air switch and diode are set between dc bus and the earth, can effectively avoid exchanging the accident that may cause after the direct current system of invading.
The technical solution of the utility model is: provide a kind of transformer station direct current system to exchange the intrusion protection device; it is characterized in that: described interchange intrusion protection device comprises first diode, second diode, air switch and A.C. voltmeter; the negative pole of its first diode is with after the positive pole of second diode is connected; link to each other with earth terminal; the negative pole of the positive pole of described first diode and second diode; link to each other with the leading-out terminal of air switch respectively, the end of incoming cables of described air switch is connected with dc bus.
Concrete, described air switch is the bipolar system air switch, the electrode input end of described bipolar system air switch is connected with first dc bus, the negative input of described bipolar system air switch is connected with second dc bus, the output of described bipolar system air switch positive and negative electrode is respectively with corresponding connection of negative pole of positive pole with second diode of first diode.
Measure input for one of its described A.C. voltmeter and link to each other with the negative or positive electrode leading-out terminal of air switch, another measurement input links to each other with earth terminal, and the power end of A.C. voltmeter links to each other with the leading-out terminal of described air switch.
Its described A.C. voltmeter is the numeric type A.C. voltmeter that adopts the output of band contact.
Its described air switch is deferred action type air switch.
Described first diode or second diode are made of more than one rectifier diode series connection.
Compared with the prior art, the utility model has the advantages that:
1. between dc bus and the earth, the serial connection diode utilizes the unidirectional conducting effect of diode, constitutes the alternating current component passage between intelligence dc bus and the earth, thereby has avoided the injury of alternating current component to direct current system;
2. utilize the voltage clamping action of diode, guarantee the relatively stable of dc bus voltage to earth, so that the high-voltage alternating component of invasion no longer flows into other loops;
3. utilize the auxiliary contact of A.C. voltmeter, the alarm signal contact externally is provided, realize warning function.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the utility model circuit theory schematic diagram.
1 is first diode among the figure, and 2 is second diode, and 3 is air switch, and 4 is A.C. voltmeter.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
Among Fig. 1, the interchange intrusion protection device of the technical program comprises first diode 1, second diode 2, air switch 3 and A.C. voltmeter 4.
The negative pole of its first diode is with after the positive pole of second diode is connected, link to each other with earth terminal, the negative pole of the positive pole of described first diode and second diode links to each other with the leading-out terminal of air switch respectively, and the end of incoming cables of described air switch is connected with dc bus.
Concrete, described air switch is the bipolar system air switch, the electrode input end of described bipolar system air switch is connected with first dc bus, the negative input of described bipolar system air switch is connected with second dc bus, the output of described bipolar system air switch positive and negative electrode is respectively with corresponding connection of negative pole of positive pole with second diode of first diode.
Measure input for one of its described A.C. voltmeter and link to each other with the negative or positive electrode leading-out terminal of air switch, another measurement input links to each other with earth terminal, and the power end of A.C. voltmeter links to each other with the leading-out terminal of described air switch.
Its described A.C. voltmeter is the numeric type A.C. voltmeter that adopts the output of band contact.
Its described air switch is deferred action type air switch.
Described first diode or second diode are made of more than one rectifier diode series connection.
Among Fig. 2, when normally moving, the direct voltage of dc bus is added between first diode 1, second diode 2 and the earth by air switch 3.
When direct current system just often because due to the triangular electric potential relation of positive bus-bar, the earth, negative busbar of dc bus, two diodes 1 and 2 all not conductings.
When the bus DC earthing takes place when, also can not occur bearing female current potential be higher than the earth or just mother be lower than the phenomenon of the earth, so still not conducting of diode can be regarded as and not exist.
After alternating current component is scurried into direct current system, if scurry into negative busbar (abbreviation negative pole) part of direct current system, then the positive half cycle of alternating current will be by diode 1 short circuit, if scurry into positive bus-bar (the being called for short anodal) part of direct current system, in like manner the negative half period of alternating current will be by 2 short circuits, thereby force the air switch of this ac circuit or direct current branch to trip rapidly, the alternating current component of excision invasion.
If the alternating current component amplitude very big (for example, high pressure " counterattack " is scurried into) of invading because the voltage clamping action of diode can guarantee the relatively stable of dc bus voltage to earth, can make the high-voltage alternating of invasion no longer flow into other loops at least.
The technical program makes the voltage of direct current positive bus be higher than ground potential all the time, negative busbar voltage is lower than ground potential all the time, no matter when dc bus voltage to earth deviation range is controlled in the scope when conventional DC earthing always, effectively guaranteed the stable of dc bus voltage to earth, significantly reduced because exchanging the probability that invasion causes the auxiliary relay malfunction.
If alternating current component seals in by transition resistance, may can't trip by the too for a short time air switch that makes of the short circuit current of diode, but because the fluctuation of bus voltage to earth is limited in the small range always, still can significantly reduce the probability of relay misoperation.
Measure input for one of A.C. voltmeter 4 and link to each other with the negative or positive electrode leading-out terminal of air switch 3, another links to each other with earth terminal, and the power end of A.C. voltmeter 4 links to each other with the leading-out terminal of described air switch 3.
The technical program adopts the numeric type A.C. voltmeter of band output contact, be used for monitoring that dc bus is to the alternating current component of the earth, in case bigger alternating voltage occurs, i.e. explanation has the invasion of interchange direct current system, alarm contact in the A.C. voltmeter is the timely outputting alarm signal of energy just, reminds the operations staff to note.
Its described first diode 1 and second diode 2 can adopt the series connection of more than one rectifier diode and constitute, and are used for preventing the DC earthing that diode breakdown causes.
When two diodes all damaged puncture, air switch 3 meeting tripping operation isolated faults were to guarantee the normal operation of direct current system.
The enforcement of the technical program, the direct current system that makes transformer station is isolated neutral system for DC component, but is grounding system for alternating current component, has improved the anti-interchange invasive ability of direct current system on the whole.
In addition, diode high-power, high back-pressure is cheap, and the reliability height makes this scheme possess better practicability.
Another characteristics of the technical program are, seal in for the alternating current component of amplitude less than the direct current system voltage to earth, and diode is inoperative, therefore can not disturb the work of adopting the DC earthing sniffer that exchanges injection mode.
Generally speaking, invade for low-voltage alternating-currents such as station electricity consumption, pressure changes, adopt the clamp diode scheme can avoid the accident potential that may bring preferably, invade for high-voltage alternating, the clamp diode scheme is by keeping the stable of bus voltage to earth, stop the high voltage that imports on the fault branch to puncture other direct current branch again, can effectively avoid exchanging the accident that may cause behind the direct current of invading.
The utility model can be widely used in the protection field of transformer and distribution power station direct current system.
Claims (6)
1. a transformer station direct current system exchanges the intrusion protection device, it is characterized in that:
Described interchange intrusion protection device comprises first diode, second diode, air switch and A.C. voltmeter; the negative pole of its first diode is with after the positive pole of second diode is connected; link to each other with earth terminal; the negative pole of the positive pole of described first diode and second diode; link to each other with the leading-out terminal of air switch respectively, the end of incoming cables of described air switch is connected with dc bus.
2. exchange the intrusion protection device according to the described transformer station direct current system of claim 1; it is characterized in that described air switch is the bipolar system air switch; the electrode input end of described bipolar system air switch is connected with first dc bus; the negative input of described bipolar system air switch is connected with second dc bus; the output of described bipolar system air switch positive and negative electrode is respectively with corresponding connection of negative pole of positive pole with second diode of first diode.
3. exchange the intrusion protection device according to the described transformer station direct current system of claim 1; a measurement input that it is characterized in that described A.C. voltmeter links to each other with the negative or positive electrode leading-out terminal of air switch; another measurement input links to each other with earth terminal, and the power end of A.C. voltmeter links to each other with the leading-out terminal of described air switch.
4. exchange the intrusion protection device according to the described transformer station direct current system of claim 1, it is characterized in that described A.C. voltmeter is the numeric type A.C. voltmeter that adopts the output of band contact.
5. exchange the intrusion protection device according to the described transformer station direct current system of claim 1, it is characterized in that described air switch is deferred action type air switch.
6. exchange the intrusion protection device according to the described transformer station direct current system of claim 1, it is characterized in that described first diode or second diode, constituted by more than one rectifier diode series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320154130 CN203135401U (en) | 2013-03-30 | 2013-03-30 | AC invasion protection device for DC system of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320154130 CN203135401U (en) | 2013-03-30 | 2013-03-30 | AC invasion protection device for DC system of transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203135401U true CN203135401U (en) | 2013-08-14 |
Family
ID=48943341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320154130 Expired - Lifetime CN203135401U (en) | 2013-03-30 | 2013-03-30 | AC invasion protection device for DC system of transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203135401U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140882A (en) * | 2015-08-27 | 2015-12-09 | 国网上海市电力公司 | Substation direct current system alternating current intrusion protection device |
| CN105356408A (en) * | 2015-10-29 | 2016-02-24 | 国网福建省电力有限公司 | Method for preventing incorrect tripping of circuit breaker, caused by secondary circuit alternating current being serially connected with direct current |
| CN107681648A (en) * | 2017-11-13 | 2018-02-09 | 国家电网公司 | A kind of power of alterating and direct current partition method for the test of substation secondary short circuit |
-
2013
- 2013-03-30 CN CN 201320154130 patent/CN203135401U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140882A (en) * | 2015-08-27 | 2015-12-09 | 国网上海市电力公司 | Substation direct current system alternating current intrusion protection device |
| CN105140882B (en) * | 2015-08-27 | 2018-03-16 | 国网上海市电力公司 | A kind of transformer station direct current system exchanges intrusion protection device |
| CN105356408A (en) * | 2015-10-29 | 2016-02-24 | 国网福建省电力有限公司 | Method for preventing incorrect tripping of circuit breaker, caused by secondary circuit alternating current being serially connected with direct current |
| CN107681648A (en) * | 2017-11-13 | 2018-02-09 | 国家电网公司 | A kind of power of alterating and direct current partition method for the test of substation secondary short circuit |
| CN107681648B (en) * | 2017-11-13 | 2019-06-14 | 国家电网公司 | A kind of power of alterating and direct current partition method being shorted test for substation secondary |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zou et al. | A fast protection scheme for VSC based multi-terminal DC grid | |
| CN203312781U (en) | Integrated anti-islanding protection system for distributed power generation | |
| CN104767194B (en) | A kind of high voltage power transmission current conversion station over-pressure safety device | |
| CN203135401U (en) | AC invasion protection device for DC system of transformer substation | |
| CN205051199U (en) | Multi -functional safe block terminal | |
| CN209167865U (en) | A kind of On-off signal detection circuit and monitoring system | |
| CN202678082U (en) | Electronic transformer collector with overcurrent and overvoltage prevention function | |
| CN204333940U (en) | A kind of intelligence revises nonlinear resistance type resonance eliminator | |
| CN105529685B (en) | A kind of interim IT grounded system switching method of frequency conversion load with TT grounded systems low-pressure system under leak current fault | |
| CN102064528A (en) | Transformer neutral point earth protection device | |
| CN203191443U (en) | Lightning arrester leakage current on-line monitoring device | |
| CN202550476U (en) | Comprehensive protective device of coal mine power center | |
| CN102148490A (en) | Three-phase combined type voltage zero sequence transformer | |
| CN204992527U (en) | Circuit breaker and system that opens circuit with disconnected zero -sum open -phase protection | |
| CN201015166Y (en) | Signal lightning protection type automatic reclosed switch | |
| CN107561406A (en) | It is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method | |
| CN209119804U (en) | Electric furnace overvoltage energy absorption protective device | |
| CN202042879U (en) | Three-phase combined voltage zero sequence transformer | |
| CN103199495B (en) | Method of preventing maloperation of generator power frequency zero sequence current protection | |
| CN202710647U (en) | Monitoring device for direct current system | |
| CN201199633Y (en) | Neutral point great current earthing DC insulation control cabinet | |
| CN205901262U (en) | Can protect SPD wiring pattern of power frequency overvoltage | |
| CN206542181U (en) | Intelligent non-pressure release coil controller | |
| CN205811535U (en) | A kind of anti-interference thunder resisting equipment | |
| CN215498243U (en) | Leakage protection system of block terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
|
| CX01 | Expiry of patent term |