CN212137272U - Locking system for preventing busbar differential protection misoperation caused by wrong input sequence of protection pressing plates in intelligent substation - Google Patents
Locking system for preventing busbar differential protection misoperation caused by wrong input sequence of protection pressing plates in intelligent substation Download PDFInfo
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- CN212137272U CN212137272U CN202020297463.XU CN202020297463U CN212137272U CN 212137272 U CN212137272 U CN 212137272U CN 202020297463 U CN202020297463 U CN 202020297463U CN 212137272 U CN212137272 U CN 212137272U
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- 241000272814 Anser sp. Species 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000007257 malfunction Effects 0.000 claims description 4
- 230000000754 repressing effect Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000013598 vector Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention discloses a locking system for preventing a bus bar differential protection misoperation caused by wrong input sequence of a protection pressing plate of an intelligent substation, which comprises a voltage transformer, a voltage merging unit, a current transformer, an interval intelligent terminal and a bus bar differential protection module, wherein the voltage transformer is connected with the voltage merging unit; and the bus differential protection module realizes bus differential protection action through the logic operation of the composite pressing element, the differential element and the interval GOOSE outlet pressing plate. The operation steps of the locking system are as follows: closing a voltage SV receiving pressure plate; closing an interval current SV receiving pressure plate; closing the bus differential protection function pressing plate, and judging whether the differential element acts or not and whether the repressing element acts or not; closing the GOOSE outlet pressing plates of each interval if the differential element does not act and the repressing element does not act; and after all the pressure plates are closed and put into operation, the bus differential protection device starts to work. By adopting the locking system, the probability of error in the operation sequence of the pressing plate of the operator can be reduced, so that the power failure accident of the power grid caused by human factors is reduced, and the safe and stable operation of the power grid is maintained.
Description
Technical Field
The invention relates to a background soft pressing plate control technology of an intelligent substation, in particular to a locking system for preventing misoperation of bus differential protection caused by wrong input sequence of protection pressing plates in the intelligent substation.
Background
In an intelligent substation, the pressure plates of the protection device are soft pressure plates which can be controlled at a background machine, and operators can operate the pressure plates in and out at the background machine, so that misoperation of the protection device, especially differential protection for judging multiple groups of currents, can be caused due to incorrect switching sequence of the pressure plates. When an electric power system has ever occurred, busbar differential protection is in misoperation in the process of putting busbar differential protection into a pressing plate and trips an operating line, so that accidents are caused, and the safe power utilization of users is influenced.
Disclosure of Invention
The invention aims at the problems and provides an intelligent substation locking system capable of preventing busbar differential protection misoperation.
In order to achieve the above object, the present invention provides a locking system for an intelligent substation to prevent a busbar differential protection malfunction caused by a wrong input sequence of a protection pressing plate, comprising: the voltage transformer is used for collecting analog voltage quantity at the bus side and transmitting the analog voltage quantity to the voltage merging unit, one end of the voltage transformer is connected with the voltage merging unit through a cable, and the other end of the voltage transformer is connected with the bus; the voltage merging unit collects analog voltage quantity, converts the analog voltage quantity into digital voltage quantity through the A/D conversion module and outputs the digital voltage quantity to the bus differential protection module, and is connected with the bus differential protection module through an optical cable and a voltage SV receiving pressing plate; the current transformer is used for collecting the analog current amount at the bus side and transmitting the analog current amount to the interval merging unit, one end of the current transformer is connected with the interval merging unit through a cable, and the other end of the current transformer is connected with the bus through an interval switch; the interval merging unit collects analog current quantity, converts the analog current quantity into digital current quantity through an A/D conversion module and outputs the digital current quantity to the bus differential protection module, and is connected with the bus differential protection module through an optical cable and an interval current SV receiving pressing plate; the interval intelligent terminal is connected with the interval switch through a cable and an interval tripping outlet pressing plate, the other end of the interval intelligent terminal is connected with the interval GOOSE outlet pressing plate of the bus differential protection module through an optical cable, and the interval intelligent terminal controls the on-off of the interval switch according to a received command of the interval GOOSE outlet pressing plate.
Preferably, the bus differential protection module comprises a composite pressing element, a differential element and a GOOSE outlet pressing plate; the voltage merging unit is connected with a composite pressing element of the bus differential protection module through an optical cable and a voltage SV receiving pressing plate; the digital voltage quantity received by the complex voltage element is divided into positive, negative and zero sequence voltage components after being filtered by the sequence component and is subjected to logic OR gate operation: when the positive, negative and zero sequence voltage components meet the OR gate condition, the re-pressing element acts; when the positive, negative and zero sequence voltage components do not meet the OR condition, the repressing element does not act.
Preferably, the interval merging unit is connected with the differential element of the bus differential protection module through an optical cable and an interval current SV receiving pressing plate; the digital current amount received by the differential element is logically operated as follows: when the digital current magnitude is larger than the current setting value of the differential element, the differential element acts; when the digital current amount is smaller than the current setting value of the differential element, the differential element does not act; and (3) carrying out logic AND gate operation on the interval GOOSE outlet pressing plate by using a differential element, a complex voltage element and a bus differential protection function pressing plate of the bus differential protection module: when the AND gate condition is met, the interval GOOSE outlet pressure plate sends a tripping command to the interval intelligent terminal; and when the AND gate condition is not met, the interval GOOSE outlet pressure plate does not send a tripping command to the interval intelligent terminal.
The invention has the beneficial effects that: by adopting the locking system, the probability of error in the operation sequence of the pressing plate of the operator can be reduced, so that the power failure accident of the power grid caused by human factors is reduced, and the safe and stable operation of the power grid is maintained.
Drawings
FIG. 1 is a schematic diagram of a busbar differential protection pressure plate of an intelligent substation;
FIG. 2 is a logic diagram of a switching sequence of a bus differential protection pressing plate of the intelligent substation;
FIG. 3 is a working schematic diagram of a busbar differential protection composite voltage element of an intelligent substation;
FIG. 4 is a schematic diagram of the operation of the differential element of the bus differential protection of the intelligent substation;
fig. 5 is a working principle diagram of a bus differential protection interval GOOSE outlet pressing plate of the intelligent substation.
Detailed Description
Fig. 1 shows a schematic diagram of a bus differential protection pressure plate of an intelligent substation, wherein 1, 2, and 3 are interval trip outlet pressure plates of a #1 line, a #2 line, and a #3 line, respectively, the interval trip outlet pressure plate is a hard pressure plate, 4 is a voltage SV receiving pressure plate, 5, 6, and 7 are interval current SV receiving pressure plates of the #1 line, the #2 line, and the #3 line, 8, 9, and 10 are interval GOOSE outlet pressure plates of the #1 line, the #2 line, and the #3 line, respectively, and 11 is a bus differential protection function pressure plate; the other press plates except the hard press plate are soft press plates which can be operated on a back-end machine, and each interval trip outlet press plate must be put into operation when each interval is in operation. In addition, the system also comprises a bus, a voltage transformer, a current transformer and a circuit breaker; the functions are respectively as follows: in an electric power system, a bus connects all current-carrying branch circuits in a distribution device together and plays a role in collecting, distributing and transmitting electric energy; the voltage transformer is used for converting high voltage into standard secondary voltage of 100V or lower level in proportion for protection, metering and instrument devices. Meanwhile, the high voltage can be isolated from the electrical workers by using the voltage transformer; the current transformer acts as a voltage transformer, but only converts the current into the current; the circuit breakers, namely #1, #2 and #3 interval switches, are used for switching on and switching off a circuit under the condition of normal operation of a power system, automatically switch off fault equipment and the circuit under the control of an electromechanical protection device during fault, and also have an automatic reclosing function.
As shown in fig. 3, the operation principle of the repressing element is as follows: the voltage transformer is used for collecting the analog voltage quantity of the bus side and transmitting the analog voltage quantity to the voltage merging unit, and the voltage transformer is connected with the voltage merging unit through a cable; the voltage merging unit collects analog voltage quantity, converts the analog voltage quantity into digital voltage quantity through an A/D conversion module and outputs the digital voltage quantity to the bus differential protection module, and is connected with a composite pressing element of the bus differential protection module through an optical cable and a voltage SV receiving pressing plate; the digital voltage quantity received by the complex voltage element is divided into positive, negative and zero sequence voltage components after being filtered by the sequence component and is subjected to logic OR gate operation: when the positive, negative and zero sequence voltage components meet the OR gate condition, the re-pressing element acts; when the positive, negative and zero sequence voltage components do not meet the OR condition, the repressing element does not act.
As shown in fig. 4, the current transformer is configured to collect an analog current amount at a bus side and transmit the analog current amount to the interval combination unit; the interval merging unit collects analog current quantity and converts the analog current quantity into digital current quantity through an A/D conversion module to be output to the bus differential protection module, and the interval merging unit is connected with a differential element of the bus differential protection module through an optical cable and an interval current SV receiving pressing plate; the digital current amount received by the differential element is logically operated as follows: when the digital current magnitude is larger than the current setting value of the differential element, the differential element acts; and when the digital current amount is smaller than the current setting value of the differential element, the differential element does not act.
As shown in fig. 5, one end of the bay intelligent terminal is connected with the bay switch through a cable and a bay trip outlet pressing plate, the other end of the bay intelligent terminal is connected with the bay GOOSE outlet pressing plate through an optical cable, and the bay intelligent terminal is used for controlling on-off of the bay switch; the differential element, the complex voltage element and the bus differential protection function pressure plate of the bus differential protection module perform logic AND operation on the interval GOOSE outlet pressure plate, and when the AND condition is met, the interval GOOSE outlet pressure plate sends a tripping command to the interval intelligent terminal; and when the AND gate condition is not met, the interval GOOSE outlet pressure plate does not send a tripping command to the interval intelligent terminal. When three conditions of differential protection function pressing plate input, differential element action and re-pressing locking element opening are simultaneously met, the bus differential protection module meets the action, and a switch tripping command is sent to each interval under the control of each interval GOOSE outlet pressing plate; the interval intelligent terminal receives a digital GOOSE tripping command, converts digital quantity into electric quantity through D/A conversion, and then drives a relay to act, and a relay contact passes through an interval tripping outlet pressing plate and then forms a loop with a tripping coil in the interval switch through a cable; when the trip contact is closed, the trip coil of the interval switch is excited and trips the interval switch.
The accident that the power system has misoperation caused by the wrong sequence of the input pressing plates occurs, and the accident is as follows: the operators carry out bus differential protection and throw-in work, and the pressing plate throwing-in sequence is as follows: and closing the bus differential protection function pressure plate, closing the GOOSE outlet pressure plates at intervals and putting in a #1 line interval current SV receiving pressure plate, wherein at the moment, the bus differential protection action trips each line switch to cause the power failure accident of all lines.
Analyzing accident causes: the bus differential protection action principle is that when a bus differential protection input pressure plate is switched in, each interval running current is received by each interval current SV receiving pressure plate, the vector sum of each interval current quantity is calculated according to the kirchhoff current law and is called differential current, the differential current is close to 0A and is smaller than a bus differential protection fixed value in normal running, a differential element cannot act, meanwhile, the bus voltage received by the voltage SV receiving pressure plate is normal, a re-pressing element cannot act, and therefore the bus differential protection cannot act. When the time difference current is larger than the bus differential protection fixed value when the bus has a fault, the differential element acts, the bus voltage is reduced, the voltage recovery element acts, the bus differential protection sends a tripping command, and the tripping command is sent to each line switch through each interval GOOSE outlet pressing plate and each interval tripping outlet pressing plate.
The cause of malfunction: firstly, a running person closes a bus differential protection function pressure plate, closes each interval GOOSE outlet pressure plate and closes a #1 line interval current SV receiving pressure plate, at the moment, the bus differential protection only receives partial interval current, so that the sum of calculated current vectors is greater than a bus differential protection fixed value, and a differential element acts; and because no input voltage SV receiving pressing plate is provided, the busbar differential protection causes the busbar differential protection voltage to be opened due to no voltage, namely, the busbar differential protection is equal to the action of a voltage resetting element, so that the busbar differential protection sends a tripping command to each line switch through each interval GOOSE outlet pressing plate and each interval tripping outlet pressing plate, and accidents are caused.
According to the analysis of the accident reasons, the bus differential protection is put into operation, and the correct operation sequence is as follows:
s1: in the bus differential protection device, firstly, a voltage SV receiving pressure plate is closed;
s2: closing a #1 line interval current SV receiving pressing plate, a #2 line interval current SV receiving pressing plate and a #3 line interval current SV receiving pressing plate;
s3: closing the bus differential protection function pressing plate, and judging whether the differential element acts or not and whether the repressing element acts or not;
s4: if the differential element does not act and the repressing element does not act, closing the #1 line interval GOOSE outlet pressing plate, the #2 line interval GOOSE outlet pressing plate and the #3 line interval GOOSE outlet pressing plate;
s5: and after the pressing plates are closed and put into operation, the bus differential protection device starts to work.
As shown in fig. 2, the bus differential protection function pressing plate is closed, the voltage SV receiving pressing plate is closed, the interval current SV receiving pressing plate is closed, the differential element does not operate, the no-operation condition of the composite pressing element is output through the and gate, the order of closing the intervals GOOSE outlet is output through the and gate, and then the interval GOOSE outlet pressing plate can be put into operation. The reason that the logic requires that the bus differential protection function pressing plate, the voltage SV receiving pressing plate, the interval current SV receiving pressing plates, the differential element does not act and the composite pressing element does not act meet the conditions, and then the interval GOOSE outlet pressing plates can be switched in is that whether the differential element acts or not can be judged only by closing the bus differential protection function pressing plate; only the closing voltage SV receives the pressure plate can judge whether the composite pressure element acts; only when each interval current SV receiving pressure plate is closed, the bus differential protection can correctly calculate the differential current, and prevent each interval current SV receiving pressure plate from causing false operation after the bus differential trip outlet is put into operation; meanwhile, whether the differential element and the repressing element act or not is judged, so that the protection device cannot malfunction before the pressure plate is put into the outlet, and the switch tripping caused by the pressure plate is prevented.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (3)
1. The utility model provides an intelligent substation prevents that protection clamp plate from putting into the locking system that sequence error caused busbar differential protection malfunction which characterized in that includes: the voltage transformer is used for collecting analog voltage quantity at the bus side and transmitting the analog voltage quantity to the voltage merging unit, one end of the voltage transformer is connected with the voltage merging unit through a cable, and the other end of the voltage transformer is connected with the bus; the voltage merging unit collects analog voltage quantity, converts the analog voltage quantity into digital voltage quantity through the A/D conversion module and outputs the digital voltage quantity to the bus differential protection module, and is connected with the bus differential protection module through an optical cable and a voltage SV receiving pressing plate; the current transformer is used for collecting the analog current amount at the bus side and transmitting the analog current amount to the interval merging unit, one end of the current transformer is connected with the interval merging unit through a cable, and the other end of the current transformer is connected with the bus through an interval switch; the interval merging unit collects analog current quantity, converts the analog current quantity into digital current quantity through an A/D conversion module and outputs the digital current quantity to the bus differential protection module, and is connected with the bus differential protection module through an optical cable and an interval current SV receiving pressing plate; the interval intelligent terminal is connected with the interval switch through a cable and an interval tripping outlet pressing plate, the other end of the interval intelligent terminal is connected with the interval GOOSE outlet pressing plate of the bus differential protection module through an optical cable, and the interval intelligent terminal controls the on-off of the interval switch according to a received command of the interval GOOSE outlet pressing plate.
2. The intelligent substation of claim 1, wherein the busbar differential protection module comprises a composite pressure element, a differential element and a spacing GOOSE outlet pressure plate; the voltage merging unit is connected with a composite pressure element of the bus differential protection module through an optical cable and a voltage SV receiving pressure plate.
3. The intelligent substation locking system for preventing busbar differential protection misoperation caused by wrong switching sequence of protection pressing plates according to claim 1 or 2 is characterized in that the interval merging unit is connected with a differential element of the busbar differential protection module through an optical cable and an interval current SV receiving pressing plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020297463.XU CN212137272U (en) | 2020-03-11 | 2020-03-11 | Locking system for preventing busbar differential protection misoperation caused by wrong input sequence of protection pressing plates in intelligent substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020297463.XU CN212137272U (en) | 2020-03-11 | 2020-03-11 | Locking system for preventing busbar differential protection misoperation caused by wrong input sequence of protection pressing plates in intelligent substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114520498A (en) * | 2021-11-26 | 2022-05-20 | 国网辽宁省电力有限公司大连供电公司 | Intelligent substation protection pressing plate sequential input system with signal identification function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114520498A (en) * | 2021-11-26 | 2022-05-20 | 国网辽宁省电力有限公司大连供电公司 | Intelligent substation protection pressing plate sequential input system with signal identification function |
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