CN203827060U - Electrical protection system for power plant - Google Patents
Electrical protection system for power plant Download PDFInfo
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- CN203827060U CN203827060U CN201420250393.7U CN201420250393U CN203827060U CN 203827060 U CN203827060 U CN 203827060U CN 201420250393 U CN201420250393 U CN 201420250393U CN 203827060 U CN203827060 U CN 203827060U
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- bus
- external power
- service entrance
- switch
- entrance switch
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Abstract
The utility model relates to an electrical protection system for a power plant. The electrical protection system comprises a bus A, a bus B, an external power source A and an external power source B, wherein the bus A is connected with the external power source A through a wire incoming switch DL1, the bus B is connected with the external power source B through a wire incoming switch DL2, the bus A and the bus B are connected through a bus tie switch DL3, an automatic switching device used for controlling closing of the bus tie switch L3 is further comprised, a protection device circuit of the wire incoming switch DL1 is connected with a locking interface of the automatic switching device, a protection device circuit of the wire incoming switch DL2 is connected with the locking interface of the automatic switching device, and a fixed protection value of the wire incoming switch DL1 and the wire incoming switch DL2 is identical to a fixed value for bus tie overcurrent protection. The electrical protection system realizes locking of the automatic switching device through protection motions of the wire incoming switch, solves a problem of automatic switching locking incapability caused by a non-corresponding interface or non-easy laying of a control cable and protects a bus in a fault from being re-impacted because of locking incapability of the automatic switching device.
Description
Technical field
The utility model relates to a kind of guard system, particularly a kind of power plant electricity consumption guard system.
Background technology
In the electrical network of each electric pressure, the automatic used device of stand-by power supply (abbreviation prepared auto restart) is widely applied as the effective means that improves power consumption equipment fail safe.Prepared auto restart equipment time should consider whether be the dead electricity that busbar fault causes in application, busbar fault if, and prepared auto restart equipment answers locking to avoid the impact again to fault bus.
Prior art as shown in Figure 1, bus A and bus B are connected respectively external power supply A and the external power supply B of main power house with DL2 by service entrance switch DL1, between bus A and bus B, by bus connection switch DL3, connect, and backup auto-activating device 1 is controlled the combined floodgate of bus connection switch DL3.Under normal circumstances, the load of bus A is powered by external power supply A, and the load of bus B is powered by external power supply B, and bus-tie circuit breaker DL3 is in normally open.When other faults beyond busbar fault occur, a bus loss of pressure, backup auto-activating device 1 action, bus-tie circuit breaker DL3 closes a floodgate, and by a power supply, is two load supplyings on bus; When busbar fault causes bus loss of pressure; electric current increases; protective device 5 actions of the protective device 4 of the mains switch DL4 of external power supply A or the mains switch DL5 of external power supply B; make external power supply A or external power supply B trip and transmit block signal; block signal is transferred to backup auto-activating device 1 by main power house; backup auto-activating device 1 locking, the impact again to bus of avoiding the action because of backup auto-activating device 1 to cause.Yet because electric power system and the unit electricity consumption region of main power house is respectively different designing unit's designs, there is interface problem between the two, block signal cannot be transferred to electricity consumption region from main power house, and the control circuit that lays in addition longer distance from main power house is very difficult with transmission block signal, so be badly in need of proposing more rational prepared auto restart closedown mode.
Utility model content
The utility model main purpose is to propose a kind of power plant electricity consumption guard system, solves above-mentioned deficiency of the prior art.
For achieving the above object, the technical solution of the utility model is:
A kind of power plant electricity consumption guard system, comprise bus A and bus B, external power supply A and external power supply B, described bus A is connected with external power supply A by service entrance switch DL1, described bus B is connected with external power supply B by service entrance switch DL2, described bus A is connected by bus connection switch DL3 with bus B, also comprise the backup auto-activating device closing a floodgate for controlling described bus connection switch DL3, the protective device circuit of described service entrance switch DL1 connects the locking interface of described backup auto-activating device, the protective device circuit of described service entrance switch DL2 connects the locking interface of described backup auto-activating device, the protection definite value of described service entrance switch DL1 and service entrance switch DL2 is identical with mother overcurrent protection definite value.
Further, the voltage of external power supply A and external power supply B is 10KV.
Further, the voltage of external power supply A and external power supply B is 6KV.
Further, the model of backup auto-activating device is DACP-3232.
Further, the protective device of service entrance switch DL1 is for being only not used in for locking backup auto-activating device the protective device that makes service entrance switch DL1 tripping operation.
Further, the protective device that carries out switch DL2 is for being only not used in for locking backup auto-activating device the protective device that makes service entrance switch DL2 tripping operation.
Content to sum up; a kind of power plant described in the utility model electricity consumption guard system; by what change service entrance switch protection action, be used for realizing locking backup auto-activating device; do not solved because interface is corresponding or control cable and be difficult for laying the problem that brought prepared auto restart cannot locking, avoided because of backup auto-activating device cannot locking to the impact again of the bus in busbar fault.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art;
Fig. 2 is structural representation of the present utility model.
As depicted in figs. 1 and 2, backup auto-activating device 1, external power supply A; external power supply B, bus A, bus B; service entrance switch DL1, the protective device 2 of service entrance switch DL1, service entrance switch DL2; the protective device 3 of service entrance switch DL2; bus connection switch DL3, mains switch DL4, the protective device 4 of mains switch DL4; mains switch DL5, the protective device 5 of mains switch DL5.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail:
As shown in Figure 2, in the present embodiment, a kind of power plant electricity consumption guard system comprises bus A and the bus B in unit electricity consumption region, the external power supply A of main power house and external power supply B, bus A is connected with external power supply A by service entrance switch DL1, bus B is connected with external power supply B by service entrance switch DL2, bus A is connected by bus connection switch DL3 with bus B, also comprise the backup auto-activating device 1 closing a floodgate for controlling described bus connection switch DL3, load during normal operation on bus A and bus B is respectively separately from external power supply A and external power supply B power taking, and bus connection switch DL3 often opens.Protective device 2 circuit of service entrance switch DL1 connect the locking interface of backup auto-activating device 1; protective device 3 circuit of service entrance switch DL2 connect the locking interface of backup auto-activating device 1, and the protection definite value of service entrance switch DL1 and service entrance switch DL2 is identical with mother overcurrent protection definite value.
The protective device 2 of service entrance switch DL1 is the coil that is connected service entrance switch DL1 and service entrance switch DL2 with the protective device 3 of service entrance switch DL2 conventional using method in the prior art; when protective device moves; service entrance switch DL1 or service entrance switch DL2 tripping operation; in the present embodiment; the protective device 2 of service entrance switch DL1 and the protective device 3 of service entrance switch DL2 connect locking interface XA2-13 and the XA2-14 of backup auto-activating device 1 for the protective device of 1, two service entrance switch of locking backup auto-activating device.The protection definite value of service entrance switch DL1 and service entrance switch DL2 is identical with mother overcurrent protection definite value; by protection definite value is set like this; can make the protective device 2 of service entrance switch DL1 and the protective device 3 of service entrance switch DL2 determine whether busbar fault, guarantee that the protective device 2 of service entrance switch DL1 and the protective device 3 of service entrance switch DL2 only just move when bus breaks down.
When other faults beyond busbar fault occur; for example main power house breaks down to a cable between electricity consumption region; now bus A or bus B dead electricity; owing to not surpassing protection definite value; the protective device 2 of service entrance switch DL1 and the protective device 3 of service entrance switch DL2 are failure to actuate; backup auto-activating device 1 starts, and bus connection switch DL3 is closed a floodgate, and by an external power supply, to bus A and bus B, is powered simultaneously.
When a bus breaks down; for example bus A breaks down; electric current increases; because the protection definite value of the protective device 2 of service entrance switch DL1 is identical with mother overcurrent protection definite value; the protective device 2 of service entrance switch DL1 moves because of overcurrent protection; locking backup auto-activating device 1, does not close a floodgate bus connection switch DL3, has avoided because the impact again to bus A that bus connection switch DL3 closes a floodgate and causes.
In the present embodiment, the voltage of external power supply A and external power supply B is 10KV or 6KV.The model of backup auto-activating device 1 is DACP-3232.
A kind of power plant described in the utility model electricity consumption guard system, has utilized the defencive function locking backup auto-activating device 1 of existing service entrance switch DL1, DL2, and backup auto-activating device 1 is not started when busbar fault, avoids the secondary pulse to bus.Owing to having used ready-made equipment, thus without the control cable that lays in addition longer distance from main power house to electricity consumption region, saved cost, properly settled in prior art because main power house and unit electricity consumption region interface do not mate brought problem.
As mentioned above, given scheme content, can derive similar technical scheme by reference to the accompanying drawings.In every case be the content that does not depart from technical solutions of the utility model, any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (6)
1.Yi Zhong power plant electricity consumption guard system, comprise bus A and bus B, external power supply A and external power supply B, described bus A is connected with external power supply A by service entrance switch DL1, described bus B is connected with external power supply B by service entrance switch DL2, described bus A is connected by bus connection switch DL3 with bus B, also comprise the backup auto-activating device closing a floodgate for controlling described bus connection switch DL3, it is characterized in that: the protective device circuit of described service entrance switch DL1 connects the locking interface of described backup auto-activating device, the protective device circuit of described service entrance switch DL2 connects the locking interface of described backup auto-activating device, the protection definite value of described service entrance switch DL1 and service entrance switch DL2 is identical with mother overcurrent protection definite value.
2. a kind of power plant according to claim 1 electricity consumption guard system, is characterized in that: the voltage of described external power supply A and external power supply B is 10KV.
3. a kind of power plant according to claim 1 electricity consumption guard system, is characterized in that: the voltage of described external power supply A and external power supply B is 6KV.
4. a kind of power plant according to claim 1 electricity consumption guard system, is characterized in that: the model of described backup auto-activating device is DACP-3232.
5. a kind of power plant according to claim 1 electricity consumption guard system, is characterized in that: the protective device of described service entrance switch DL1 is for being only not used in for locking backup auto-activating device the protective device that makes service entrance switch DL1 tripping operation.
6. a kind of power plant according to claim 1 electricity consumption guard system, is characterized in that: the protective device of described service entrance switch DL2 is for being only not used in for locking backup auto-activating device the protective device that makes service entrance switch DL2 tripping operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420250393.7U CN203827060U (en) | 2014-05-15 | 2014-05-15 | Electrical protection system for power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420250393.7U CN203827060U (en) | 2014-05-15 | 2014-05-15 | Electrical protection system for power plant |
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| Publication Number | Publication Date |
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| CN203827060U true CN203827060U (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420250393.7U Active CN203827060U (en) | 2014-05-15 | 2014-05-15 | Electrical protection system for power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362735A (en) * | 2014-11-06 | 2015-02-18 | 山东中实易通集团有限公司 | Method for narrowing outage range of power station |
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2014
- 2014-05-15 CN CN201420250393.7U patent/CN203827060U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362735A (en) * | 2014-11-06 | 2015-02-18 | 山东中实易通集团有限公司 | Method for narrowing outage range of power station |
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