CN109861179A - A kind of bus protection voltage-switching method suitable for powering mode of handing in hand - Google Patents
A kind of bus protection voltage-switching method suitable for powering mode of handing in hand Download PDFInfo
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- CN109861179A CN109861179A CN201910211385.9A CN201910211385A CN109861179A CN 109861179 A CN109861179 A CN 109861179A CN 201910211385 A CN201910211385 A CN 201910211385A CN 109861179 A CN109861179 A CN 109861179A
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Abstract
The invention discloses a kind of bus protection voltage-switching methods suitable for powering mode of handing in hand; under powering mode hand in hand; bus PT is not installed generally on 110kV substation high-voltage side bus; bus protection accesses respectively back into the position of the switch of line, voltage, current information; judged according to the position of the switch and voltage and current characteristic synthetic, chooses the PT voltage of operation inlet wire as the busbar voltage in Protection criteria.After certain work inlet wire breaks down tripping switch; according to the safety control strategy of power supply hand in hand; standby inlet switch are closed a floodgate, and restore the power supply to bus, the busbar voltage that Protection criteria uses can be switched to spare inlet wire from original operation inlet wire automatically by bus protection at this time.Precise and reliable of the present invention, switching quickly, can adapt to the powering mode hand in hand that load frequently turns to supply completely, improve power supply reliability.
Description
Technical field
The present invention relates to a kind of bus protection voltage-switching methods suitable for powering mode of handing in hand, and belong to electric system
Field of automation technology.
Background technique
Currently, economic development, electric power is leading, and electric power is the basis of national economy and social development.Power grid security is society
The important component of public safety, it is ensured that power grid security and electric power are orderly supplied, and are the bases built a harmonious socialist society
This requirement.
More demanding to power supply reliability in some developed areas, 110kV power distribution network can be using power supply mould hand in hand
Formula improves power supply reliability, improves power supply quality, promotes operation of power networks efficiency, further increases the economy of power grid operation management
Benefit and social benefit.
Under powering mode hand in hand, any point breaks down, and self-healing system can all be born according to safety control strategy
Lotus turns to supply, therefore a plurality of inlet wire on 110kV substation high-voltage side bus can have the switching that investment exits in the process of running
Process.And hand in hand under powering mode, high-voltage side bus does not often configure bus PT, and bus protection can only obtain the electricity of inlet wire PT
Pressure differentiates for relay protective scheme.During switching is moved back in inlet wire throwing, if bus protection cannot correctly quickly finish voltage
Switching, it will the action behavior for directly affecting protection has the risk according to dynamic and malfunction.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the present invention provides a kind of suitable for powering mode hand in hand
Bus protection voltage-switching method.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of bus protection voltage-switching method suitable for powering mode of handing in hand, includes the following steps:
Step 1: bus protection acquires the position of the first inlet wire, the incoming switch C1 of the second inlet wire, incoming switch C2 on bus, the
CT1 electric current, PT1 voltage on one inlet wire, CT2 electric current, PT2 voltage on the second inlet wire；
Step 2: judging the operating condition of the first inlet wire, the second inlet wire respectively；
Step 3: when the first inlet wire or the second inlet wire put into operation, bus protection takes PT1 voltage or PT2 as busbar voltage.
Preferably, if the step 2 include: on the first inlet wire CT1 have stream, incoming switch C1 quartile, and
Bus protection do not receive the first incoming relay-protection sending trip signal, incoming switch C1 auxiliary contact broken string cause it is collected into
The position wiretap C1 is quartile, and it is coincidence that incoming switch C1 is practical, judges that the first inlet wire puts into operation.
Preferably, if the step 2 include: on the second inlet wire CT2 have stream, incoming switch C2 quartile, and
Bus protection do not receive the second incoming relay-protection sending trip signal, incoming switch C2 auxiliary contact broken string cause it is collected into
The position wiretap C2 is quartile, and it is coincidence that incoming switch C2 is practical, judges that the second inlet wire puts into operation.
Preferably, if the step 2 include: on the first inlet wire CT1 without stream, PT1 have pressure, switch C1 coincidence,
First inlet wire operates normally but load current has been unable to reach stream and has differentiated threshold, judges that the first inlet wire puts into operation；
Preferably, if the step 2 include: on the second inlet wire CT2 without stream, PT2 have a pressure, switch C2 coincidence, second
Inlet wire operates normally but load current has been unable to reach stream and has differentiated threshold, judges that the second inlet wire puts into operation.
Preferably, further include step 4: if the step 4 include: on the first inlet wire CT1 have stream, incoming switch
C1 quartile, and bus protection receives the trip signal of the first incoming relay-protection sending, if the first inlet wire is in shape out of service
State, but bus dead zone is broken down, switch C1 has electric current to flow through, the movement of the first inlet wire route protection, judgement do not choose first into
Line voltage is as busbar voltage.
Preferably, further include step 4: if the step 4 include: on the second inlet wire CT2 have stream, incoming switch
C2 quartile, and bus protection receives the trip signal of the second incoming relay-protection sending, if the second inlet wire is in shape out of service
State, but bus dead zone is broken down, switch C2 has electric current to flow through, the movement of the second inlet wire route protection, judgement do not choose second into
Line voltage is as busbar voltage.
The utility model has the advantages that a kind of bus protection voltage-switching method suitable for powering mode of handing in hand provided by the invention,
Complete interval information is acquired, criterion considers various operating conditions, precise and reliable, and switching quickly, is conducive to improve power supply reliability,
Advantage is as follows:
1, the method different from only carrying out voltage switching only in accordance with disconnecting link position, voltage-switching method of the invention consider to open simultaneously
Off position and voltage and current acquire the complete information at inlet wire interval, multi information judgement and verification, effectively promote voltage switching
Reliability.
2, criterion is arranged according to the practical operation situation at inlet wire interval, such as auxiliary contact broken string, inlet wire load current connect
Closely without stream etc., situation that can be not corresponding with voltage and current condition in the position of the switch judges whether inlet wire puts into operation, effectively
Promote the accuracy of voltage switching.
3, the method for only carrying out voltage switching only in accordance with disconnecting link position, in order to reduce probability of miscarriage of justice, disconnecting link location confirmation is prolonged
When it is longer.
4, the present invention uses multiple information synthesis criterion, there is verification between multi information, and the variation of voltage and current condition compared with
Fastly, position of the switch confirmation delay, the whole rapidity for promoting voltage switching can be shortened.
Detailed description of the invention
Fig. 1 is Connection Mode system construction drawing of handing in hand；
Fig. 2 is that bus protection acquires information content schematic diagram；
Fig. 3 is voltage transfer criterion flow chart of the present invention.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
As shown in Figure 1, the electric power incoming line of 110kV substation is from two 220kV power transformations hand in hand under powering mode
It stands, each electric power incoming line forms " hand in hand " statements based on collusion mode.There are open loop points for system when normal operation, such as 110kV-C stands in figure
Switch C2 and C5, when 110kV power circuit or certain station are broken down, main station system can be according to Self healing Strategy pair
The station C, D, E part incoming switch of 110kV carries out breaking-closing operating, to achieve the purpose that maximum magnitude restores electricity.It is pulling
Under hand powering mode, 110kV substation high-voltage side bus does not configure bus PT, voltage analog needed for bus protection need from into
Line PT is introduced.
As shown in Fig. 2, the station C high-voltage side bus accesses two electric power incoming lines, respectively 1 He of inlet wire so that 110kV-C stands as an example
Inlet wire 2, inlet wire 1 and inlet wire 2 configure CT and route PT, and bus does not configure PT, and bus protection logical operation required voltage measures
From PT1 or PT2.
When the station C is as liaison station operation, the inlet wire 1 on high-voltage side bus puts into operation, and inlet wire 2 is out of service, the station C at
For the open loop point in system.When route troubles inside the sample space occurs for K1 point, the route protection that inlet wire 1 configures acts tripping route two sides
A1 and C1 switch, C stand 1# become institute's on-load all have a power failure.In order to guarantee power supply reliability, self-healing system is according to tactful instantaneous
It is switched to C1 and trip signal occurs, it is ensured that then fault point isolation closes the switch C2 of inlet wire 2, restore to become 1# and power.?
During failure removal and service restoration, inlet wire 1 is switched to by investment to be exited, and inlet wire 2 is switched to investment by exiting；Failure it
Preceding bus protection takes 1 voltage PT1 of inlet wire as busbar voltage, after failure removal service restoration, the PT1 out of service of inlet wire 1 without
Pressure, bus protection must take 2 voltage PT2 of inlet wire as busbar voltage.Inlet wire 1 be withdrawn into inlet wire 2 put into during, two into
The position of the switch of line and voltage and current change, and bus protection acquires the complete interval information of two inlet wires, are rapidly completed
Voltage switching.
As shown in Figures 2 and 3, a kind of bus protection voltage-switching method suitable for powering mode of handing in hand, acquire into
The position of the switch, voltage, electric current and the trip signal at line interval, include the following steps:
Step 1: bus protection acquires the position of the first inlet wire, the incoming switch C1 of the second inlet wire, incoming switch C2 on bus, the
CT1 electric current, PT1 voltage on one inlet wire, CT2 electric current, PT2 voltage on the second inlet wire；
Step 2: if CT1 has stream, incoming switch C1 quartile on the first inlet wire, and bus protection does not receive the first incoming relay-protection
The trip signal of sending, incoming switch C1 auxiliary contact broken string causes the position collected incoming switch C1 to be quartile, and inlet wire
Switch C1 practical is coincidence, judges that the first inlet wire puts into operation；
Step 3: if CT2 has stream, incoming switch C2 quartile on the second inlet wire, and bus protection does not receive the second incoming relay-protection
The trip signal of sending, incoming switch C2 auxiliary contact broken string causes the position collected incoming switch C2 to be quartile, and inlet wire
Switch C2 practical is coincidence, judges that the second inlet wire puts into operation；
Step 4: if CT1 has stream, incoming switch C1 quartile on the first inlet wire, and bus protection receives the first incoming relay-protection hair
Trip signal out, if the first inlet wire is in state out of service, but bus dead zone is broken down, and switch C1 has electric current stream
It crosses, the first inlet wire route protection movement, judgement does not choose the first primary voltage as busbar voltage；
Step 5: if CT2 has stream, incoming switch C2 quartile on the second inlet wire, and bus protection receives the second incoming relay-protection hair
Trip signal out, if the second inlet wire is in state out of service, but bus dead zone is broken down, and switch C2 has electric current stream
It crosses, the second inlet wire route protection movement, judgement does not choose the second primary voltage as busbar voltage；
Step 6: if CT1 without stream, PT1 has a pressure, switch C1 coincidence on the first inlet wire, the first inlet wire normal operation but load current
It has been unable to reach stream and has differentiated threshold, judged that the first inlet wire puts into operation；
Step 7: if CT2 without stream, PT2 has a pressure, switch C2 coincidence on the second inlet wire, the second inlet wire normal operation but load current
It has been unable to reach stream and has differentiated threshold, judged that the second inlet wire puts into operation.
Above-mentioned criterion comprehensively considers inlet wire under various operating conditions, correspondence that the position of the switch and voltage and current are likely to occur or not
Corresponding situation, can be accurately judged to whether inlet wire puts into operation, and voltage switching is rapidly completed, and the voltage for running inlet wire is made
For busbar voltage.
Step 8: when the first inlet wire or the second inlet wire put into operation, bus protection takes PT1 voltage or PT2 as bus electricity
Pressure.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of bus protection voltage-switching method suitable for powering mode of handing in hand, characterized by the following steps:
Step 1: bus protection acquires the position of the first inlet wire, the incoming switch C1 of the second inlet wire, incoming switch C2 on bus, the
CT1 electric current, PT1 voltage on one inlet wire, CT2 electric current, PT2 voltage on the second inlet wire；
Step 2: judging the operating condition of the first inlet wire, the second inlet wire respectively；
Step 3: when the first inlet wire or the second inlet wire put into operation, bus protection takes PT1 voltage or PT2 as busbar voltage.
2. a kind of bus protection voltage-switching method suitable for powering mode of handing in hand according to claim 1, special
Sign is: if the step 2 include: on the first inlet wire CT1 have stream, incoming switch C1 quartile, and bus protection does not receive
The trip signal that first incoming relay-protection issues, incoming switch C1 auxiliary contact broken string cause the position collected incoming switch C1 to be
Quartile, and it is coincidence that incoming switch C1 is practical, judges that the first inlet wire puts into operation.
3. a kind of bus protection voltage-switching method suitable for powering mode of handing in hand according to claim 1, special
Sign is: if the step 2 include: on the second inlet wire CT2 have stream, incoming switch C2 quartile, and bus protection does not receive
The trip signal that second incoming relay-protection issues, incoming switch C2 auxiliary contact broken string cause the position collected incoming switch C2 to be
Quartile, and it is coincidence that incoming switch C2 is practical, judges that the second inlet wire puts into operation.
4. a kind of bus protection voltage-switching method suitable for powering mode of handing in hand according to claim 1, special
Sign is: if the step 2 include: on the first inlet wire CT1 without stream, PT1 have pressure, switch C1 coincidence, the first inlet wire is normally transported
Row but load current have been unable to reach stream and have differentiated threshold, judge that the first inlet wire puts into operation.
5. a kind of bus protection voltage-switching method suitable for powering mode of handing in hand according to claim 1, special
Sign is: if the step 2 include: on the second inlet wire CT2 without stream, PT2 have pressure, switch C2 coincidence, the second inlet wire is normally transported
Row but load current have been unable to reach stream and have differentiated threshold, judge that the second inlet wire puts into operation.
6. a kind of bus protection voltage-switching method suitable for powering mode of handing in hand according to claim 1, special
Sign is: further include step 4: if the step 4 include: on the first inlet wire CT1 have stream, incoming switch C1 quartile, and it is female
Line protection receives the trip signal of the first incoming relay-protection sending, if the first inlet wire is in state out of service, but bus dead zone
It breaks down, switch C1 has electric current to flow through, and the first inlet wire route protection movement, judgement does not choose the first primary voltage as bus
Voltage.
7. a kind of bus protection voltage-switching method suitable for powering mode of handing in hand according to claim 1, special
Sign is: further include step 4: if the step 4 include: on the second inlet wire CT2 have stream, incoming switch C2 quartile, and it is female
Line protection receives the trip signal of the second incoming relay-protection sending, if the second inlet wire is in state out of service, but bus dead zone
It breaks down, switch C2 has electric current to flow through, and the second inlet wire route protection movement, judgement does not choose the second primary voltage as bus
Voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910211385.9A CN109861179B (en) | 2019-03-20 | 2019-03-20 | Bus protection voltage switching method suitable for hand-in-hand power supply mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910211385.9A CN109861179B (en) | 2019-03-20 | 2019-03-20 | Bus protection voltage switching method suitable for hand-in-hand power supply mode |
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| CN109861179B CN109861179B (en) | 2020-07-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389239A (en) * | 2021-12-21 | 2022-04-22 | 国电南瑞科技股份有限公司 | Bus protection voltage determination method and device in hand-in-hand wiring mode and storage medium |
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| CN109861179B (en) | 2020-07-24 |
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