CN102738776A - Method capable of effectively avoiding power terminal misoperation and control circuit - Google Patents
Method capable of effectively avoiding power terminal misoperation and control circuit Download PDFInfo
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- CN102738776A CN102738776A CN201210199177XA CN201210199177A CN102738776A CN 102738776 A CN102738776 A CN 102738776A CN 201210199177X A CN201210199177X A CN 201210199177XA CN 201210199177 A CN201210199177 A CN 201210199177A CN 102738776 A CN102738776 A CN 102738776A
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Abstract
The invention discloses a method capable of effectively avoiding power terminal misoperation and a control circuit. A master control MCU (microprogrammed control unit) is also connected with a monostability repeatable trigger U4, and the monostability repeatable trigger U4 is connected with a bus switch relay U5 through an optocoupler. A fixed high level Q1 is outputted by the monostability repeatable trigger. When the master control MCU fails, a low level is outputted by the monostability repeatable trigger, the bus switch relay U5 is switched off, and a control loop loses power. An MCU condition monitoring circuit guarantees that the bus switch relay U5 is switched on only when the MCU operates normally, and no misoperation of a power automation terminal is guaranteed in an abnormal condition. The method capable of effectively avoiding the power terminal misoperation and the control circuit disclosed by the invention have the advantages that no misoperation of the power automation terminal can be guaranteed in the abnormal condition, the control reliability is high, the working stability of various power automation terminals is improved, the safety of a power grid is guaranteed and the like.
Description
Technical field
The present invention relates to a kind of method and the control circuit that can effectively avoid the electric power terminal misoperation.
Background technology
Power industry is related to economic security of the country and lifelines of the national economy, and huge, the miscellaneous various automatic powers of quantity terminal is the key that ensures the safe operation of electric power primary equipment.At present; The electric power primary equipment of every kind of key has at least a kind of automatization terminal that it is monitored, manages; The kind at automatic power terminal comprises all kinds such as monitoring, metering, protection; And one of typical (remote measurement, remote signalling, remote control) " three is distant " function of distant control function conduct, various terminals all generally possess.
Because various power automation terminal quantities are huge, running environment is complicated, terminal control misoperation happens occasionally, and causes the unexpected power failure of power consumer, and possibly cause great electric power accident.The Typical control loop at current various power automations terminal is as shown in Figure 3.Can find out that from the circuit of Fig. 3 the I/O mouth (MCU_IO) of CPU is as the initiation point of control section, the I/O mouth of CPU is connected with bus-tie circuit breaker relay U2 through optocoupler, has directly determined external control output.Generally is the minimum part of operating voltage from the I/O mouth of CPU to the former limit of optocoupler; Optical coupling secondary edges is generally 12VDC or 24VDC to the operating voltage between the relay, and relatively low operating voltage causes this two parts circuit and CPU to be easier to disturbed from work time ratio under comparing rugged environment.In the actual motion, CPU I/O mouth in start-up course often is in high-impedance state, when in abominable electromagnetic environment, moving; The output pickup electrode of the I/O mouth of CPU is vulnerable to disturb; On the I/O mouth, produce disturbing signal, cause externally producing misoperation, threaten the safety of electric power system.
Summary of the invention
The present invention is the weak point that exists in the above-mentioned prior art for avoiding, and a kind of method and the control circuit that can effectively avoid the electric power terminal misoperation is provided, with the job stability that improves the power automation terminal, guarantee mains supply safety.
The present invention adopts following technical scheme for the technical solution problem.
Can effectively avoid the method for electric power terminal misoperation; Be characterized in; The output of main control MCU is connected starting relay U6 and control relay U7 through optocoupler U2 respectively with optocoupler U3; But also be connected with monostable repeated trigger device U4 on the main control MCU, but monostable repeated trigger device U4 be connected with bus-tie circuit breaker relay U5 through optocoupler, control procedure comprises following step:
When a.MCU normally moved, P3.0 constantly exported rising edge pulse Pulse;
B. but monostable repeated trigger device is exported a fixing high level Q1;
C. but monostable repeated trigger device control bus-tie circuit breaker relay U5 is closed;
D. MCU exports enabling signal, and starting relay U6 is closed;
E.MCU exports control signal, and control relay U7 is closed;
F. control outlet YK_OUT externally exports control voltage;
G. after control outlet YK_OUT output pulse width reached, enabling signal and control signal were cancelled, and control procedure finishes.
Of the present invention a kind of control circuit that is used to implement said method is provided also.
Can effectively avoid the control circuit of the method for electric power terminal misoperation, its design feature is that the output of main control MCU connects starting relay U6 through optocoupler U2; The output of main control MCU connects control relay U7 through optocoupler U3; But the output P3.0 of main control MCU is connected with monostable repeated trigger device U4; But the output of monostable repeated trigger device U4 is connected with bus-tie circuit breaker relay U5 through optocoupler U1.
Said main control MCU output P1.0 is connected with the input of optocoupler U2, and said main control MCU output P1.1 is connected with another input of optocoupler U2 through resistance R 3, and the output of optocoupler U2 is connected with starting relay U6; Said main control MCU output P2.0 is connected with the input of optocoupler U3, and said main control MCU output P2.1 is connected with another input of optocoupler U3 through resistance R 4, and the output of optocoupler U3 is connected with control relay U7.
Compared with present technology, beneficial effect of the present invention is embodied in:
Method and the control circuit that can effectively avoid the electric power terminal misoperation of the present invention, but, guaranteed only just often that control bus-tie circuit breaker relay U5 just can be closed by monostable repeated trigger device U4 monitoring MCU state in the MCU operation.In order to guarantee power automation not malfunction of terminal under the abnormal conditions, the power supply of control loop is adopted the method for substep control, just under the situation of automatization terminal preparation to outer control control loop is powered up in short-term.Enabling signal (by P1.0 and P1.1 output) and control signal (by P2.0 and P2.1 output) all adopt the mode of two differential outputs of I/O mouth to drive, and have further strengthened the reliability of control.
Method and the control circuit that can effectively avoid the electric power terminal misoperation of the present invention; Have the job stability that can guarantee power automation not malfunction of terminal under the abnormal conditions, control reliability height, the various power automations of raising terminal, guarantee advantages such as power grid security.
Description of drawings
Fig. 1 is the circuit theory diagrams that can effectively avoid the control circuit of electric power terminal misoperation of the present invention.
Fig. 2 is the control flow chart that can effectively avoid the control method of electric power terminal misoperation of the present invention.
Fig. 3 is the circuit theory diagrams in the Typical control loop of prior art.
Below pass through embodiment, and combine accompanying drawing that the present invention is described further.
Embodiment
Referring to Fig. 1 and Fig. 2; Can effectively avoid the method for electric power terminal misoperation; The output of main control MCU is connected starting relay U6 and control relay U7 through optocoupler U2 respectively with optocoupler U3; But also be connected with monostable repeated trigger device U4 on the main control MCU, but monostable repeated trigger device U4 be connected with bus-tie circuit breaker relay U5 through optocoupler, control procedure comprises following step:
When a.MCU normally moved, P3.0 constantly exported rising edge pulse Pulse;
B. but monostable repeated trigger device is exported a fixing high level Q1;
C. but monostable repeated trigger device control bus-tie circuit breaker relay U5 is closed;
D. MCU exports enabling signal, and starting relay U6 is closed;
E.MCU exports control signal, and control relay U7 is closed;
F. control outlet YK_OUT externally exports control voltage;
G. after control outlet YK_OUT output pulse width reached, enabling signal (QD+, the QD-of the P1.0 of MCU and P1.1 port among Fig. 1) and control signal (YK+, the YK-of the P2.0 of MCU and P2.1 port among Fig. 1) were cancelled, and control procedure finishes.
MCU is through the state of the Pulse pin that constantly overturns, through two fixing low levels of monostable flipflops output that trigger.When MCU crashes or resets, because the Pulse pin does not overturn, this circuit will be exported a high level.Therefore, the state through the RUN pin is the state of decidable MCU.In order to guarantee power automation not malfunction of terminal under the abnormal conditions, the method that adopts substep to provide to the power supply of control loop is just only normal in the MCU operation, automatization terminal is prepared under the situation to outer control control loop to be powered up in short-term.
Can effectively avoid the output of control circuit main control MCU of the method for electric power terminal misoperation to connect starting relay U6 through optocoupler U2; The output of main control MCU connects control relay U7 through optocoupler U3; But the output P3.0 of main control MCU is connected with monostable repeated trigger device U4; But the output of monostable repeated trigger device U4 is connected with bus-tie circuit breaker relay U5 through optocoupler U1.
Said main control MCU output P1.0 is connected with the input of optocoupler U2, and said main control MCU output P1.1 is connected with another input of optocoupler U2 through resistance R 3, and the output of optocoupler U2 is connected with starting relay U6; Said main control MCU output P2.0 is connected with the input of optocoupler U3, and said main control MCU output P2.1 is connected with another input of optocoupler U3 through resistance R 4, and the output of optocoupler U3 is connected with control relay U7.By the unexpected driving of interference signal, adopt adjacent two the I/O mouth differential drivings of MCU for fear of optocoupler with port.
Move under the normal situation at MCU, bus-tie circuit breaker relay U5 can be closed, and the assurance subsequent operation can normally be carried out; , otherwise bus-tie circuit breaker relay U5 breaks off.If bus-tie circuit breaker relay U5 breaks off, follow-up startup, control loop can't get electric, and control loop can not get driving power, and so final power automation terminal is the output control signal externally.When the automatization terminal decision moves just often outer control output and MCU, through the differential output of I/O mouth QD+, the QD-of MCU, starting relay U6 closure, otherwise control relay U7 can't get.At last, by I/O mouth differential output YK+ and the YK-of MCU, finally to outer control output, after output pulse width was enough, QD+, QD-, YK+, YK-control signal were returned, and the I/O mouth of relevant MCU changes input state into.
Hardware circuit is as shown in Figure 1, comprises MCU running state monitoring circuit and relay drive circuit two parts.
1, MCU status monitor circuit
When MCU was in abnormality or the reseting procedure, the I/O mouth of MCU was in nondeterministic statement and produces misoperation, need monitor the running status of MCU.As shown in Figure 1, but MCU running state monitoring circuit is made up of CD4098B monostable repeated trigger device and MCU jointly.The work period of trigger can be adjusted through the size that changes resistance R 1 and capacitor C 1.Setting the work period among Fig. 1 is T=0.1uF*100K=10ms.Like this, as long as the I/O mouth (Pulse) of MCU is regularly exported rising edge, just can make fixing high level Run of CD4098B output, guarantee that control bus-tie circuit breaker relay U5 is closed, control loop gets.Otherwise MCU is not if export rising edge in one-period, and control bus-tie circuit breaker relay U5 will break off the control loop dead electricity.Like this, just guaranteed that MCU moves when normal control loop and gets electricly, the control loop dead electricity has effectively improved the fail safe to outer control when unusual.Wherein, but the work period of monostable repeated trigger device is short more, and the fail safe of control loop is high more.
2, relay drive circuit
The MCU status monitor circuit has guaranteed that only in the MCU operation just often control bus-tie circuit breaker relay U5 just can be closed.In order to guarantee power automation not malfunction of terminal under the abnormal conditions, the power supply of control loop is adopted the method for substep control, just under the situation of automatization terminal preparation to outer control control loop is powered up in short-term.Concrete control procedure is following:
(1) the MCU operation is just often controlled bus-tie circuit breaker relay (U5) closure.
When (2) automatization terminal was prepared outer control, MCU exported enabling signal (QD+, QD-), starting relay (U6) closure.
(3) during the final export abroad of automatization terminal, MCU exports control signal (YK+, YK-), control relay (U7) closure.Control outlet (YK_OUT) is output control voltage externally.
(4) after control outlet (YK_OUT) output pulse width reached, enabling signal (QD+, QD-), control signal (YK+, YK-) were cancelled, and control procedure finishes.
Enabling signal (output port is P1.0, P1.1) and control signal (output port is P2.0, P2.1) signal all adopt the mode of two differential outputs of I/O mouth to drive, and have further strengthened the reliability of control.
Control method of the present invention and circuit can avoid controlling misoperation through the status monitoring to core MCU with fixing operation logic, and when realizing that through wave generator circuit MCU stops the rollover states signal, control loop can not get.Give to start the loop when MCU normally moves and power up, start circuit closed in the time of need be to outer control and power up to control loop, startup loop, back is accomplished in control output and control loop returns.
Claims (3)
1. can effectively avoid the method for electric power terminal misoperation; It is characterized in that; The output of main control MCU is connected starting relay U6 and control relay U7 through optocoupler U2 respectively with optocoupler U3; But also be connected with monostable repeated trigger device U4 on the main control MCU, but monostable repeated trigger device U4 be connected with bus-tie circuit breaker relay U5 through optocoupler, control procedure comprises following step:
When a.MCU normally moved, P3.0 constantly exported rising edge pulse Pulse;
B. but monostable repeated trigger device is exported a fixing high level Q1;
C. but monostable repeated trigger device control bus-tie circuit breaker relay U5 is closed;
D. MCU exports enabling signal, and starting relay U6 is closed;
E.MCU exports control signal, and control relay U7 is closed;
F. control outlet YK_OUT externally exports control voltage;
G. after control outlet YK_OUT output pulse width reached, enabling signal and control signal were cancelled, and control procedure finishes.
2. be used to implement the control circuit that can effectively avoid the method for electric power terminal misoperation of claim 1, it is characterized in that, the output of main control MCU connects starting relay U6 through optocoupler U2; The output of main control MCU connects control relay U7 through optocoupler U3; But the output P3.0 of main control MCU is connected with monostable repeated trigger device U4; But the output of monostable repeated trigger device U4 is connected with bus-tie circuit breaker relay U5 through optocoupler U1.
3. control circuit according to claim 2; It is characterized in that; Said main control MCU output P1.0 is connected with the input of optocoupler U2; Said main control MCU output P1.1 is connected with another input of optocoupler U2 through resistance R 3, and the output of optocoupler U2 is connected with starting relay U6; Said main control MCU output P2.0 is connected with the input of optocoupler U3, and said main control MCU output P2.1 is connected with another input of optocoupler U3 through resistance R 4, and the output of optocoupler U3 is connected with control relay U7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199177XA CN102738776A (en) | 2012-06-15 | 2012-06-15 | Method capable of effectively avoiding power terminal misoperation and control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199177XA CN102738776A (en) | 2012-06-15 | 2012-06-15 | Method capable of effectively avoiding power terminal misoperation and control circuit |
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| CN102738776A true CN102738776A (en) | 2012-10-17 |
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| CN201210199177XA Pending CN102738776A (en) | 2012-06-15 | 2012-06-15 | Method capable of effectively avoiding power terminal misoperation and control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226329A (en) * | 2013-03-20 | 2013-07-31 | 中国航天科技集团公司第四研究院第四十一研究所 | Multiple-switch signal interlock circuit for testing and controlling device |
| CN108347040A (en) * | 2017-12-20 | 2018-07-31 | 国网浙江省电力公司湖州供电公司 | Intelligent intermediate relay, protective relaying device and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11177731A (en) * | 1997-12-05 | 1999-07-02 | Canon Inc | Communication terminal equipment with computer interface |
| CN2641896Y (en) * | 2003-04-28 | 2004-09-15 | 上海协同科技股份有限公司 | False acting proof and action rejecting proof remote control circuit with redundant coding and self-checking feedback |
| CN1917319A (en) * | 2006-09-01 | 2007-02-21 | 清华大学 | Device for preventing unwanted operation of relay based on pulse transfer |
-
2012
- 2012-06-15 CN CN201210199177XA patent/CN102738776A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11177731A (en) * | 1997-12-05 | 1999-07-02 | Canon Inc | Communication terminal equipment with computer interface |
| CN2641896Y (en) * | 2003-04-28 | 2004-09-15 | 上海协同科技股份有限公司 | False acting proof and action rejecting proof remote control circuit with redundant coding and self-checking feedback |
| CN1917319A (en) * | 2006-09-01 | 2007-02-21 | 清华大学 | Device for preventing unwanted operation of relay based on pulse transfer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226329A (en) * | 2013-03-20 | 2013-07-31 | 中国航天科技集团公司第四研究院第四十一研究所 | Multiple-switch signal interlock circuit for testing and controlling device |
| CN103226329B (en) * | 2013-03-20 | 2016-06-15 | 中国航天科技集团公司第四研究院第四十一研究所 | A kind of switch signal interlock circuit of many groups for measuring and controlling equipment |
| CN108347040A (en) * | 2017-12-20 | 2018-07-31 | 国网浙江省电力公司湖州供电公司 | Intelligent intermediate relay, protective relaying device and system |
| CN108347040B (en) * | 2017-12-20 | 2019-07-23 | 国网浙江省电力公司湖州供电公司 | Intelligent intermediate relay, protective relaying device and system |
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Application publication date: 20121017 |