CN103647306B - A kind of automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate - Google Patents
A kind of automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate Download PDFInfo
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- CN103647306B CN103647306B CN201310673778.4A CN201310673778A CN103647306B CN 103647306 B CN103647306 B CN 103647306B CN 201310673778 A CN201310673778 A CN 201310673778A CN 103647306 B CN103647306 B CN 103647306B
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Abstract
The invention discloses a kind of automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate, for non-Switching Synchronization accident under the various generator automatic presynchronization modes occurred in electric power system, by increasing part components and parts and computer supervisory control system PLC modification of program, corresponding locking contact is increased in automatic presynchronization closing circuit, and adopt two different control cables to make each locking contact in the series connection of synchronizing switch side, thus generator automatic presynchronization closing circuit is made to be able to perfect.Present invention efficiently solves occurred at present do not start synchronous device time combined floodgate misoperation, start synchronous device after the synchronous device problem of non-Switching Synchronization accident that opens by mistake out, cause in the situation such as asynchronous switch-on return cable fault, ensure that the correct action message that generator automatic presynchronization is grid-connected.
Description
Technical field
The invention belongs to electric system generator simultaneous interconnecting technical field, relate to a kind of automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate proposed for generator asynchronous Closing fault phenomenon.
Background technology
Non-Switching Synchronization phenomenon of the failure is there is in electric system generator automatic presynchronization making process, be summed up the problem that major part is synchronous device, but also there is the problem of control loop, the reliability of the synchronous device often that people pay close attention to itself, and ignore combined floodgate control loop is optimized, do not take measures to prevent misoperation or false switching from control loop aspect.
In the non-Switching Synchronization accident occurred, as certain factory's outlet breaker control loop secondary cable insulation damages that Shanxi Province in 1997 occurs, cause between cable core and puncture instantaneously, closing circuit is connected, and result in generator asynchronous and to close a floodgate grid-connected accident; Misoperation that the operation that Inner Mongol power plant in 2010 occurs " starts the button same period " causes generator asynchronous to close a floodgate grid-connected accident etc. for " switch switch knob ", is all close a floodgate after order is directly closed a floodgate without any locking to cause.
Therefore, start with from generator automatic presynchronization shutting-brake control loop, by improving barring condition, optimal control logic, is reached by the optimization in shutting-brake control loop and prevents generator asynchronous combined floodgate to be worth exploring.
Summary of the invention
The object of the invention is to the deficiency for existing generator synchronous closing circuit, propose the automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate that a kind of equipment investment cost is low and safe and reliable.
To achieve these goals, present invention employs following technical scheme:
The automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate, wherein, sets up two locking contacts in the asynchronous switch-on loop of computer supervisory control system dish cabinet side, and namely synchronizing checking relay closes contact TJJ and opens contact KA1 with the startup relay same period; Described synchronizing checking relay close contact TJJ, synchronous device outputs order of closing a floodgate opens contact KA3 and start same period relay and open contact KA1 and connect successively; Close contact TJJ and the synchronous device of described synchronizing checking relay are outputed the contact KA3 that opens made that closes a floodgate and after connecting in monitoring panel cabinet side, are opened contact KA1 again with the startup relay same period connect in generator outlet circuit breaker control cabinet side; Be specially:
Described synchronous device output order of closing a floodgate drive contact KA3 and described synchronizing checking relay close after contact TJJ connects, lay to generator outlet circuit breaker control cabinet by independently cable I; The described startup relay same period open contact KA1 be in supervisory control system the original startup relay same period often open spare contact, lay to generator outlet circuit breaker control cabinet by independently cable II;
In generator outlet circuit breaker control cabinet side, cable I and cable II are connected; The other end that contact KA1 opened by the other end closing contact TJJ of described synchronizing checking relay and the startup relay same period accesses closing circuit of circuit breaker respectively, forms the automatic presynchronization closing circuit of perfect latching logic.
The starting-up later time of synchronizing checking relay is provided with two isolating transformers and one output relay; The former limit of two isolating transformers access respectively power system voltage, the same period object voltage, what secondary connected that access outputs relay respectively opens contact KA2, then accesses synchronizing checking relay.Output relay checks relay operating state for control synchronization, prevent synchronizing checking relay charged for a long time.
Described output relay output the original startup relay same period in logical AND supervisory control system to output logic consistent.That is to say, output relay monitoring PLC program output action logic and to start same period relay logic consistent.
Start same period relay to open contact and to ensure that when not starting synchronous device that automatic presynchronization loop can not conducting, ensure that and there will not be false switching when not starting synchronous device to operate; Synchronizing checking relay phase angle difference setting value is set to 20 °, namely only have when system voltage, the same period, object phase difference of voltage was less than 20 °, it is just closed that synchronizing checking relay TJJ closes contact, thus phase angle difference when ensure that combined floodgate can not be greater than 20 °, therefore when even if synchronous device opens by mistake out, when also can not cause combined floodgate, phase angle difference deviation is excessive, there will not be non-Switching Synchronization.
Advantage of the present invention:
(1) the present invention by increasing synchronizing checking relay and starting relay locking same period contact in generator automatic presynchronization closing circuit, and adopt two independently cable carry out the loop blocking method of Signal transmissions, efficiently solve combined floodgate misoperation when not starting synchronous device, start the situations such as synchronous device after synchronous device opens by mistake out, asynchronous switch-on return cable fault under the non-Switching Synchronization accident that causes, ensure that the correct action message that generator automatic presynchronization is grid-connected.
(2) the invention process is simple, security reliability is high, has very large on-the-spot practical application promotional value.
(3) equipment that the present invention increases is 1 synchronous blocking relay, relay and stube cable are outputed in 2 isolating transformers, 1 monitoring, and equipment investment cost is low.
Accompanying drawing explanation
Fig. 1 is that in the present invention, involved supervisory control system PLC outputs schematic diagram.
Fig. 2 is the control principle drawing of involved synchronizing checking relay starting-up later time in the present invention.
Fig. 3 is that in the present invention, schematic diagram is outputed in involved synchronous device combined floodgate order.
Fig. 4 is that in the present invention, involved original generator outlet breaker closing makes schematic diagram.
Fig. 5 is that in the present invention, after involved improvement, generator outlet breaker closing makes schematic diagram.
Fig. 6 is involved circuit breaker automatic presynchronization closing circuit schematic diagram in the present invention.
In figs. 1-6: DO1 and DO2 represents that measuring point outputed by computer supervisory control system respectively, KA1 represents the startup relay same period and contact thereof, KA2 represents and outputs relay and contact thereof, KA3 represents that synchronous device is outputed combined floodgate and made relay and contact thereof, TJJ represents synchronizing checking relay and contact thereof, and TQ, HZ, GCB represent connecting terminal block.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment:
The automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate, wherein sets up two locking contacts in the asynchronous switch-on loop of computer supervisory control system dish cabinet side, and namely synchronizing checking relay closes contact TJJ and opens contact KA1 with the startup relay same period; Described synchronizing checking relay close contact TJJ, synchronous device outputs order of closing a floodgate opens contact KA3 and start same period relay and open contact KA1 and connect successively; Close contact TJJ and the synchronous device of described synchronizing checking relay are outputed the contact KA3 that opens made that closes a floodgate and after connecting in monitoring panel cabinet side, are opened contact KA1 again with the startup relay same period connect in generator outlet circuit breaker control cabinet side; Be specially:
Described synchronous device output order of closing a floodgate drive contact KA3 and described synchronizing checking relay close after contact TJJ connects, lay to generator outlet circuit breaker control cabinet by independently cable I; The described startup relay same period open contact KA1 be in supervisory control system the original startup relay same period often open spare contact, lay to generator outlet circuit breaker control cabinet by independently cable II;
In generator outlet circuit breaker control cabinet side, cable I and cable II are connected; The other end that contact KA1 opened by the other end closing contact TJJ of described synchronizing checking relay and the startup relay same period accesses closing circuit of circuit breaker respectively, forms the automatic presynchronization closing circuit of perfect latching logic.
The starting-up later time of synchronizing checking relay is provided with two isolating transformers and one output relay; The former limit of two isolating transformers access respectively power system voltage, the same period object voltage, what secondary connected that access outputs relay respectively opens contact KA2, then accesses synchronizing checking relay.
Described output relay output the original startup relay same period in logical AND supervisory control system to output logic consistent.
Claims (3)
1. the automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate, it is characterized in that: in the asynchronous switch-on loop of computer supervisory control system dish cabinet side, set up two locking contacts, namely synchronizing checking relay closes contact TJJ and opens contact KA1 with the startup relay same period; Described synchronizing checking relay close contact TJJ, synchronous device outputs order of closing a floodgate opens contact KA3 and start same period relay and open contact KA1 and connect successively; Close contact TJJ and the synchronous device of described synchronizing checking relay are outputed the contact KA3 that opens made that closes a floodgate and after connecting in monitoring panel cabinet side, are opened contact KA1 again with the startup relay same period connect in generator outlet circuit breaker control cabinet side; Be specially:
Described synchronous device output order of closing a floodgate drive contact KA3 and described synchronizing checking relay close after contact TJJ connects, lay to generator outlet circuit breaker control cabinet by independently cable I; The described startup relay same period open contact KA1 be in computer supervisory control system the original startup relay same period often open spare contact, lay to generator outlet circuit breaker control cabinet by independently cable II;
In generator outlet circuit breaker control cabinet side, cable I and cable II are connected; The other end that contact KA1 opened by the other end closing contact TJJ of described synchronizing checking relay and the startup relay same period accesses closing circuit of circuit breaker respectively, forms the automatic presynchronization closing circuit of perfect latching logic.
2. the automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate according to claim 1, is characterized in that: on the starting-up later time of synchronizing checking relay, be provided with two isolating transformers and one output relay; The former limit of two isolating transformers access respectively power system voltage, the same period object voltage, what secondary connected that access outputs relay respectively opens contact KA2, then accesses synchronizing checking relay.
3. the automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate according to claim 2, is characterized in that: described output relay output the original startup relay same period in logical AND computer supervisory control system to output logic consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310673778.4A CN103647306B (en) | 2013-12-10 | 2013-12-10 | A kind of automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310673778.4A CN103647306B (en) | 2013-12-10 | 2013-12-10 | A kind of automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate |
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| Publication Number | Publication Date |
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| CN103647306A CN103647306A (en) | 2014-03-19 |
| CN103647306B true CN103647306B (en) | 2015-08-12 |
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| CN201310673778.4A Active CN103647306B (en) | 2013-12-10 | 2013-12-10 | A kind of automatic presynchronization closing circuit preventing generator asynchronous from closing a floodgate |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182156B (en) * | 2015-09-05 | 2018-02-16 | 国家电网公司 | Based on waveform visualization synchronous loop device for detecting polarity and detection method |
| CN107134809B (en) * | 2017-05-19 | 2023-06-02 | 山东中实易通集团有限公司 | Automatic synchronization grid-connection system and grid-connection method for power plant |
| CN110707753B (en) * | 2019-09-23 | 2023-06-23 | 大唐陕西发电有限公司西安热电厂 | Synchronous device closing loop for three-half main wiring |
| CN111030186A (en) * | 2019-12-20 | 2020-04-17 | 广西桂冠电力股份有限公司 | Prevent to mistake and close return circuit of generator outlet switch |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201226446Y (en) * | 2007-12-13 | 2009-04-22 | 天津天铁冶金集团有限公司 | Electric control device for preventing generator from non-synchronization parallel |
| CN202332019U (en) * | 2011-09-15 | 2012-07-11 | 宁波市鄞州供电局 | Simulation circuit breaker |
| CN202888865U (en) * | 2012-07-27 | 2013-04-17 | 大唐华银电力股份有限公司 | Unit synchronization system provided with synchronization block relay |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05344656A (en) * | 1992-06-09 | 1993-12-24 | Mitsubishi Electric Corp | Synchronizer connecting device for generator facility |
| JPH0888938A (en) * | 1994-09-13 | 1996-04-02 | Toshiba Corp | Synchronous closing device |
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- 2013-12-10 CN CN201310673778.4A patent/CN103647306B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201226446Y (en) * | 2007-12-13 | 2009-04-22 | 天津天铁冶金集团有限公司 | Electric control device for preventing generator from non-synchronization parallel |
| CN202332019U (en) * | 2011-09-15 | 2012-07-11 | 宁波市鄞州供电局 | Simulation circuit breaker |
| CN202888865U (en) * | 2012-07-27 | 2013-04-17 | 大唐华银电力股份有限公司 | Unit synchronization system provided with synchronization block relay |
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| CN103647306A (en) | 2014-03-19 |
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