CN216929577U - Intelligent substation protection clamp plate order system of puting into with signal identification - Google Patents
Intelligent substation protection clamp plate order system of puting into with signal identification Download PDFInfo
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- CN216929577U CN216929577U CN202122931115.0U CN202122931115U CN216929577U CN 216929577 U CN216929577 U CN 216929577U CN 202122931115 U CN202122931115 U CN 202122931115U CN 216929577 U CN216929577 U CN 216929577U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention discloses an intelligent substation protection pressing plate sequential input system with signal identification, which is characterized by comprising a bus, a voltage transformer, a current transformer and a breaker, wherein the bus is connected with the voltage transformer; wherein, the effect of generating line does: connecting the current-carrying branch circuits of the power distribution devices in the power system together so as to collect, distribute and transmit electric energy; the voltage transformer has the following functions: the high voltage is converted into standard secondary voltage of 100V or lower level according to the proportional relation, and the standard secondary voltage is used for protecting, metering and instrument devices, so that the high voltage is isolated from electrical workers; the current transformer acts as a voltage transformer; the circuit breaker has the following functions: the relay protection device is used for switching on and switching off a circuit under the condition of normal operation of a power system, automatically switching off fault equipment and the circuit under the control of the relay protection device during fault, and also has an automatic reclosing function.
Description
Technical Field
The invention relates to a technology for controlling a flexible pressing plate of an intelligent transformer substation, in particular to a system for putting bus differential protection pressing plates of the intelligent transformer substation into use in sequence.
Background
The intelligent substation protection device pressing plates are soft pressing plates which can be controlled at a background machine, and operators can operate the pressing plates in the background machine. Incorrect switching sequence of the pressure plates can cause malfunction of the protection device, especially for differential protection for judging multiple groups of currents. When a bus differential protection switching process occurs in an electric power system, bus differential protection misoperation is caused by wrong switching sequence of the pressing plates, so that an operating line is tripped, accidents are caused, and safe and reliable electricity utilization of users is influenced. Therefore, in order to prevent protection misoperation caused by wrong input sequence of the protection pressing plates, a protection pressing plate sequential input system for the intelligent substation is urgently needed.
Disclosure of Invention
Aiming at the problems, the invention provides a system for sequentially putting protection pressing plates into an intelligent substation.
In order to achieve the aim, the invention provides an intelligent substation protection pressing plate sequential switching system with signal identification, which comprises a bus, a voltage transformer, a current transformer and a circuit breaker, wherein the bus is connected with the voltage transformer; wherein, the effect of generating line does: connecting the current-carrying branch circuits of the power distribution devices in the power system together so as to collect, distribute and transmit electric energy; the voltage transformer has the following functions: the high voltage is converted into standard secondary voltage of 100V or lower level according to a proportional relation, and the standard secondary voltage is used for protecting, metering and instrument devices, and the high voltage is isolated from electrical workers; the current transformer acts as a voltage transformer; the circuit breaker has the following functions: the relay protection device is used for switching on and switching off a circuit under the condition of normal operation of a power system, automatically switching off fault equipment and the circuit under the control of the relay protection device during fault, and also has an automatic reclosing function.
According to the intelligent substation protection pressing plate with the signal identification, in an optimal mode, 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 and converts the analog voltage quantity into digital voltage quantity through the A/D conversion module to be output to the bus differential protection module, the voltage merging unit is connected with a re-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 re-pressing element is filtered through a sequential component and then subjected to logic OR gate operation, and when an OR gate condition is met, the re-pressing element acts to open the re-pressing locking element.
According to the intelligent substation protection pressing plate with the signal identification, in an optimal mode, the current transformer is used for collecting the analog current quantity of the bus side and transmitting the analog current quantity to the interval merging unit; the interval combination 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, the interval combination 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 differential element performs logic operation on the received digital current quantity, and when the differential element action criterion is met, the differential element acts.
In the above system, preferably, the differential starting element also performs logic operation on the received digital current amount, and when any phase difference current is greater than a phase difference starting value, the differential starting element acts; when the differential starting element acts for a long time and the voltage recovery element does not act, the differential current sensed by the bus differential protection is not caused by the actual fault of the bus, but is caused by other abnormalities.
The invention has the beneficial effects that: by adopting the system, the correctness of the operation sequence of the pressing plates of operators can be ensured, and the error probability of the operation sequence of the pressing plates is reduced, so that the power failure accidents of the power grid caused by human factors are reduced, and the safe and stable operation of the power grid is maintained.
Drawings
FIG. 1 is a schematic diagram of a bus differential protection basic diagram of an intelligent substation;
FIG. 2 is a working schematic diagram of a busbar differential protection composite voltage element of an intelligent substation;
FIG. 3 is a schematic diagram of the operation of the differential element of the bus differential protection of the intelligent substation;
fig. 4 is a working schematic diagram of an intelligent substation bus differential protection GOOSE trip module;
fig. 5 is a schematic diagram of the identification of the bus differential protection signal by the intelligent substation background machine;
fig. 6 is a logic diagram of sequential switching of bus differential protection pressing plates of the intelligent substation.
Detailed Description
As shown in fig. 1, it is a fundamental diagram of bus differential protection of an intelligent substation. In the figure, a bus, a voltage transformer, a current transformer and a breaker (switch) are all primary devices. Wherein, the effect of generating line does: individual current-carrying branch circuits of power distribution devices in an electrical power system are connected together to collect, distribute, and transfer electrical energy. The voltage transformer has the following functions: the high voltage is converted into standard secondary voltage of 100V or lower level according to the proportional relation, and the standard secondary voltage is used for protecting, metering and instrument devices; isolating the high voltage from the electrical personnel. The current transformer acts like a voltage transformer but converts the amount of current. The circuit breakers (#1, #2, #3 switches) function as: the relay protection device is used for switching on and switching off a circuit under the condition of normal operation of a power system, automatically switching off fault equipment and the circuit under the control of the relay protection device during fault, and also has an automatic reclosing function.
In fig. 1, 2, and 3 are #1 line, #2 line, #3 line interval trip exit clamps (hard clamps), 4 is a voltage SV receiving clamp, 5, 6, and 7 are #1 line, #2 line, #3 line interval current SV receiving clamps, 8, 9, and 10 are #1 line, #2 line, #3 line interval GOOSE exit clamps, and 11 is a bus differential protection function clamp. Except for hard pressure plates of each interval trip outlet, other pressure plates are soft pressure plates which can be operated on a background machine, and when the interval operation is carried out, the trip outlet pressure plates of the interval trip outlet pressure plates are required to be put into use.
In fig. 1, the operation principle of the repressing element is shown in fig. 2: 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 and converts the analog voltage quantity into digital voltage quantity through the A/D conversion module to be output to the bus differential protection module, the voltage merging unit is connected with a re-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 re-pressing element is filtered through a sequential component and then subjected to logic OR gate operation, and when an OR gate condition is met, the re-pressing element acts to open the re-pressing locking element.
In fig. 1, the operating principle of the differential element is shown in fig. 3: the current transformer is used for collecting the analog current magnitude of the bus side and transmitting the analog current magnitude to the interval merging unit; the interval combination 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, the interval combination 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 differential element performs logic operation on the received digital current quantity, and when the differential element action criterion is met, the differential element acts.
The process of receiving the amount of digital current by the differential start-up element is the same as that of the differential element, as in fig. 3. The differential starting element also performs logic operation on the received digital current amount, and operates when any phase difference current is larger than the phase difference starting value. When the differential starting element acts for a long time and the voltage restoring element does not act, the differential current sensed by the bus differential protection is not caused by the actual fault of the bus but is caused by other abnormalities (such as polarity inversion of a current transformer, abnormality of a secondary circuit and the like). At this time, if the bus bar protection is put into operation, the bus bar protection malfunctions when the composite voltage element is abnormally opened (for example, when the voltage transformer is disconnected secondarily). Thus, long-term actuation of the differential start element will signal a "differential long-term start" alarm to the background engine. This patent can discern backstage machine bus differential protection "differential long-term start" alarm signal to regard it as the shutting condition, shutting bus differential protection GOOSE export clamp plate and drop into the function. The "differential long-term start" signal received by the background machine belongs to the prior art, and uses the original equipment and network of the substation automation system, and the schematic diagram is shown in fig. 5: an alarm signal generated by the bus differential protection is sent to the background machine through a station control layer network built by a station control layer switch, the background machine monitors and identifies a differential long-term starting signal transmitted by the bus differential protection through an alarm window, and the differential long-term starting signal is used as one of the judgment conditions for opening the input functions of GOOSE outlet pressing plates of all intervals.
In fig. 1, the operation principle of the GOOSE trip module is shown in fig. 4: one end of 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 bus differential protection module through an optical cable and an interval GOOSE outlet pressing plate, and the interval intelligent terminal is used for controlling the on-off of the interval switch; and carrying out logic AND gate operation on the GOOSE tripping module by a differential element, a repressing element and a bus differential protection function pressure plate of the bus differential protection module, and when the AND gate condition is met, the GOOSE tripping module acts. 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; each interval intelligent terminal is connected with the bus differential protection through an optical fiber; 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.
In a power system, an accident of malfunction due to an error in the order of the press plates put in has occurred. The accident is passed: 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 bus differential protection function pressure plate, a GOOSE outlet pressure plate and a #1 line interval current SV receiving pressure plate are closed by an operator, at the moment, the bus differential protection only receives partial interval current, so that the sum of calculated current vectors (namely differential current) is not zero and is greater than a bus differential protection fixed value, and a differential element acts; and because no input voltage SV receiving pressure plate exists, 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 recovery element, so that the busbar differential protection sends a tripping command to each line switch through each interval GOOSE outlet pressure plate and each interval tripping outlet pressure plate, and accidents are caused.
According to the analysis of the accident reasons, the correct operation sequence of the operation of the bus differential protection 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 pressure plate, and judging whether the differential element acts or not and whether the composite pressure element acts or not after time delay and whether a differential long-term starting alarm exists or not;
s4: if the differential element does not act, the repressing element does not act and no 'differential long-term starting' alarm exists, the input function of each interval GOOSE outlet pressure plate is opened;
s5: and after the pressing plates are closed and put into operation, the bus differential protection device starts to work.
As shown in fig. 6, after the closed voltage SV receiving pressing plate, the closed interval current SV receiving pressing plate and the closed bus differential protection function pressing plate are output by the and gate for 10s, the and gate outputs the condition of no differential long-term start alarm, no action of the differential element and no action of the composite pressing element, and then the input of the interval GOOSE outlet pressing plate is allowed. The logic requires that after the closed voltage SV receiving pressure plate, the closed interval current SV receiving pressure plates and the closed bus differential protection function pressure plate are delayed, the input function of each interval GOOSE outlet pressure plate is opened only when the conditions of no differential long-term starting alarm, no action of a differential element and no action of a composite pressure element are met, because the reasons are as follows: only the closing voltage SV receives the pressure plate can judge whether the composite pressure element acts; only when every interval current SV receiving pressure plate is closed, the bus differential protection can correctly calculate the differential current; only the bus differential protection function pressing plate is closed, whether the differential element and the differential starting element act can be judged; after time delay, whether a differential long-term starting alarm exists or not and whether a differential element and a repressing element act or not are judged, so that the protection device can not malfunction before functions of every interval outlet are put into operation, and the phenomenon that the switch is tripped by mistake due to the fact that an outlet pressing plate is put into operation 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 (4)
1. An intelligent substation protection pressing plate sequential input system with signal identification is characterized by comprising a bus, a voltage transformer, a current transformer and a circuit breaker; wherein, the effect of generating line does: connecting the current-carrying branch circuits of the power distribution devices in the power system together so as to collect, distribute and transmit electric energy; the voltage transformer has the following functions: the high voltage is converted into standard secondary voltage of 100V or lower level according to the proportional relation, and the standard secondary voltage is used for protecting, metering and instrument devices, so that the high voltage is isolated from electrical workers; the current transformer acts as a voltage transformer; the circuit breaker has the following functions: the relay protection device is used for switching on and switching off a circuit under the condition of normal operation of a power system, automatically switching off fault equipment and the circuit under the control of the relay protection device during fault, and also has an automatic reclosing function.
2. The intelligent substation protection pressing plate sequential input system with the signal identification function according to claim 1, wherein the voltage transformers are used for collecting analog voltage quantity at a bus side and transmitting the analog voltage quantity to the voltage merging unit, and are connected with the voltage merging unit through cables; the voltage merging unit collects analog voltage quantity and converts the analog voltage quantity into digital voltage quantity through the A/D conversion module to be output to the bus differential protection module, the voltage merging unit is connected with a re-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 re-pressing element is filtered through a sequential component and then subjected to logic OR gate operation, and when an OR gate condition is met, the re-pressing element acts to open the re-pressing locking element.
3. The intelligent substation protection pressing plate sequential input system with signal identification as claimed in claim 2, wherein the current transformer is used for collecting the analog current amount of the bus side and transmitting the analog current amount to the interval merging unit; the interval combination unit collects analog current magnitude, converts the analog current magnitude into digital current magnitude through the A/D conversion module and outputs the digital current magnitude to the bus differential protection module, the interval combination 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 differential element performs logic operation on the received digital current magnitude, and when the differential element action criterion is met, the differential element acts.
4. The intelligent substation protection pressing plate sequential switching system with signal identification as claimed in claim 3, wherein the differential starting element also performs logic operation on the received digital current amount, and when any phase differential current is larger than a phase differential starting value, the differential starting element acts; when the differential starting element acts for a long time and the voltage recovery element does not act, the differential current sensed by the bus differential protection is not caused by the actual fault of the bus, but is caused by other abnormalities.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| 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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