CN114256817A - Circuit breaker failure protection misoperation prevention improvement method and system - Google Patents
Circuit breaker failure protection misoperation prevention improvement method and system Download PDFInfo
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- CN114256817A CN114256817A CN202111454262.1A CN202111454262A CN114256817A CN 114256817 A CN114256817 A CN 114256817A CN 202111454262 A CN202111454262 A CN 202111454262A CN 114256817 A CN114256817 A CN 114256817A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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Abstract
The circuit breaker failure protection misoperation prevention improvement method and the circuit breaker failure protection misoperation prevention improvement system take a starting failure protection signal as an outlet enabling signal or an outlet control signal of the circuit breaker failure protection, so that the circuit breaker failure protection output logic improvement is realized; in practical application, the improved breaker failure protection input signal is consistent with the original breaker failure protection input signal, and the occurrence of breaker failure protection misoperation caused by abnormity such as secondary circuit interference of a breaker failure protection device can be avoided only by changing the breaker failure protection logic or only adding one relay or linked switch, so that the workload and operation and maintenance cost of operation and maintenance personnel are greatly reduced. The invention is easy to deploy and apply for modification, has wide application range and considerable expected popularization and economic benefit.
Description
Technical Field
The invention belongs to the technical field of relay protection of power systems, and particularly relates to a method and a system for improving the malfunction prevention of a circuit breaker.
Background
The breaker failure protection is used as an important component of backup protection in the relay protection of the power system, and plays an important role in the safe operation of the power system. When short circuit starting failure occurs, adjacent elements cannot be cut off, and then under the condition of cutting off fault current, the circuit breaker failure protection realizes the isolation of fault elements or lines by cutting off the adjacent circuit breakers of the failed circuit breakers, and the influence of short circuit fault on the elements and the system is eliminated.
The breaker failure protection is composed of a voltage locking element, a starting loop formed by protection action and current discrimination, a time element and a tripping outlet loop. The starting loop is one of the keys for ensuring the correct work of the whole set of protection, and must be safe and reliable, double judgment should be realized, the failure of the circuit breaker is judged under a single condition, and the false starting caused by the fact that the protection contact is stuck and does not return or is mistakenly touched, mistakenly electrified and the like is prevented. The starting circuit comprises a starting element and a judging element; the 2 elements constitute an and logic. The starting element usually utilizes the circuit breaker automatic tripping outlet loop itself, and can directly use the outlet tripping relay contact which returns instantaneously, and can also use the auxiliary intermediate relay contact which is connected with the outlet tripping relay in parallel and returns instantaneously, and the contact action does not return to indicate the failure of the circuit breaker. The discrimination element discriminates in a different way that the fault is indeed not eliminated. The existing operation equipment adopts a current judging mode of phase current (line) and zero sequence current (transformer). After the protection action, the current still exists in the loop, which indicates that the fault is not eliminated. The time element is an intermediate link of the breaker failure protection, and in order to prevent the malfunction protection misoperation caused by the failure of a single time element, the time element and a starting loop form an AND logic and then an outlet relay is started. The voltage lock for failure protection is generally composed of a bus low voltage, a negative sequence voltage and a zero sequence voltage relay. When the fault protection and the bus differential protection share an outlet trip circuit, they also share a voltage blocking element.
In the prior art, a judgment logic circuit of breaker failure protection is shown in fig. 1, and an opening logic of breaker failure protection is mainly formed by a starting failure signal, a breaker current signal and a breaker position signal which are sent by relay protection, and after the three signals pass through an and logic, the three signals are subjected to time delay and then trigger a trial tripping failure breaker. As can be seen from fig. 1, when the judging logic circuit operates, when a start failure signal, a breaker current signal and a breaker position signal exist at the same time, the breaker failure protection open circuit outputs a signal, which is used for cutting off all corresponding breakers.
Because the action condition of the breaker failure protection is harsh, the possibility of the failure protection of the breaker to reject action is very low under the general condition, and the failure protection is fully verified in the actual operation. However, in actual operation, a circuit breaker failure protection malfunction event occurs at times. Through analyzing relevant fault events, the main reason for the malfunction protection malfunction of the circuit breaker is found to be that stray signals such as interference signals are coupled into a secondary circuit, and then the malfunction signals are caused in the opening link, so that the malfunction protection malfunction of the circuit breaker is caused. In order to prevent the malfunction of the circuit breaker failure protection, in the prior art 1(CN105914714B) "method for preventing the malfunction of the circuit breaker failure protection based on current waveform identification", a blocking signal of a circuit breaker trip identification flag is added to the original malfunction logic, and the trailing current is quickly identified to conclude that the circuit breaker has tripped, so as to quickly block the malfunction protection logic, thereby preventing the malfunction of the failure protection due to the trailing current. The method in the prior art 1 is mainly used for identifying the malfunction protection misoperation of the circuit breaker, a solution for avoiding the misoperation is not provided, and the identification method is complex and needs a large amount of calculation.
In the prior art 2(CN103618296B) "locking method for breaker failure protection", judgment is performed according to the relationship between the zero sequence current and the negative sequence current after a single-phase or two-phase fault occurs in the system and the zero sequence currents and the negative sequence currents of other branches, so as to prevent malfunction protection, get rid of the dependence of using a single electric quantity, namely voltage, as a locking element for breaker failure protection, and improve the sensitivity and reliability of the locking element for breaker failure protection. The method in the prior art 2 depends on the electric quantities such as zero sequence current, negative sequence current and the like, so that on one hand, the reliability of the protection function is reduced, and on the other hand, the malfunction protection can be rejected due to the false locking.
In the prior art 3(CN106451328B) "adaptive circuit breaker failure protection method", a ratio of a dc component amplitude to a fundamental current amplitude in a secondary phase current is calculated, a secondary trailing current of a current transformer is determined, and a circuit breaker protection device determines and adjusts a threshold value of a failure protection action current according to the ratio of the dc component amplitude to the fundamental current amplitude, so as to prevent a malfunction, effectively solve a contradiction between a quick action property and reliability of failure protection, and enable a power system to stably operate. The method provided by the prior art 3 is complex in calculation and difficult to ensure accuracy and reliability.
Prior art 4(CN212811266U) "a relay protection open control circuit for preventing malfunction and its application device", wherein open control circuit includes dual logic control circuit, dual logic control circuit includes relay power supply control circuit and export relay control circuit, relay power supply control circuit is the common drive circuit of dual control signal, export relay control circuit is the circuit through second MOS pipe control relay coil, and dual logic control circuit makes every control signal's state clear and definite, can effectively avoid the open malfunction in the product operation in the open control. Prior art 4 builds a control circuit, which is complicated in structure and many in components, and besides increases the construction cost, due to the introduction of new components, the reliability is reduced accordingly
In summary, in order to improve the performance of the breaker failure protection device in the operation process, reduce the power failure accidents of the transformer substation caused by the misoperation of the breaker failure protection device, and reduce the economic loss caused by the misoperation of the breaker failure protection device, an improvement method for the misoperation of the breaker failure protection device needs to be researched.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method and a system for improving the malfunction prevention of the circuit breaker malfunction protection, improve the open logic of the malfunction prevention malfunction of the circuit breaker, enable the malfunction protection of the circuit breaker by using a start malfunction signal, and avoid the malfunction protection malfunction of a circuit breaker malfunction protection device caused by internal parasitic capacitance current, external electromagnetic interference and the like.
The invention adopts the following technical scheme.
An improved method for preventing malfunction of a circuit breaker, comprising:
in a conventional transformer substation, when a current transformer acquires the current of a circuit breaker, a current signal of the circuit breaker is effective, the position of the circuit breaker acquired by a monitoring sensor of the circuit breaker is used as a circuit breaker position signal for failure protection, and a signal sent by a relay protection device is used as a failure starting signal for triggering failure protection;
in the intelligent substation, when the merging unit sends a current signal, a current signal of the circuit breaker is effective, the position of the circuit breaker acquired by the merging unit is used as a circuit breaker position signal for failure protection, and a signal sent by the relay protection device is used as a failure starting signal for triggering failure protection;
Preferably, in step 1, for a conventional substation, the breaker current collected by the current transformer is used to determine whether current flows through the breaker: when the collected breaker current is not zero, judging that the current signal of the breaker is an effective signal, and when the collected breaker current is zero, judging that the current signal of the breaker is an ineffective signal; for the intelligent substation, whether the current of the breaker flows through is judged by using the current signal sent by the merging unit: when the merging unit sends out a current signal, the current signal of the circuit breaker is judged to be an effective signal, and when the merging unit does not send out the current signal, the current signal of the circuit breaker is judged to be an ineffective signal;
for a conventional transformer substation, a circuit breaker position signal acquired by a monitoring sensor of a circuit breaker is used as a circuit breaker position signal for failure protection; for the intelligent substation, the circuit breaker position signals collected by the merging unit are used as circuit breaker position signals for failure protection;
for both a conventional transformer substation and an intelligent transformer substation, a signal sent by a relay protection device is used as a failure starting signal for triggering failure protection; the relay protection device comprises a circuit, a bus and a relay protection device of a transformer;
for a failure starting signal, a current signal of a circuit breaker and a position signal of the circuit breaker, an effective signal is at a high level, and an ineffective signal is at a low level.
Preferably, in step 2, the start failure signal, the breaker current signal and the breaker position signal are subjected to logical and operation to obtain a first logical judgment result, that is:
when the starting failure signal, the breaker current signal and the breaker position signal are all high levels, the first logic judgment result is the high level, and breaker failure protection is ready to be started;
when any one of the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker is at a low level, the first logic judgment result is at a low level, and the circuit breaker failure protection is not opened.
Preferably, in step 3, when the first logic judgment result is in a high level, the enable failure signal is used as an enable signal or a control signal output by the first logic judgment result.
Preferably, for an enable signal output by taking the start failure signal as the first logic judgment result, when the start failure signal is at a high level, the first logic judgment result is output, that is, the circuit breaker failure protection is opened;
when the starting failure signal is at a low level, the first logic judgment result is not output, namely the breaker failure protection is not opened.
Preferably, when the start failure signal is used as the control signal output by the first logic judgment result, and the start failure signal is at a high level, the first logic judgment result output circuit is turned on, that is, the circuit breaker failure protection is turned on;
when the starting failure signal is at a low level, the first logic judgment result output circuit is switched off, namely the circuit breaker failure protection is not switched off.
The circuit breaker failure protection anti-malfunction improvement system comprises: the circuit breaker failure protection switching-out logic module comprises a signal acquisition module and a circuit breaker failure protection switching-out logic module;
the signal acquisition module is used for acquiring a starting failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker;
the circuit breaker failure protection switching-out logic module is used for outputting whether the circuit breaker failure protection is switched out or not according to the switching-on failure signal, the circuit breaker current signal and the circuit breaker position signal;
the circuit breaker failure protection open logic module comprises: a first logic judgment unit and a second logic judgment unit; the first logic judgment unit takes a start failure signal, a breaker current signal and a breaker position signal as input signals, and the second logic judgment unit takes the output of the first logic judgment unit and the start failure signal as input signals;
the first logic judgment unit is used for carrying out first logic judgment on the breaker failure protection by utilizing the failure starting signal, the breaker current signal and the breaker position signal; when the starting failure signal, the breaker current signal and the breaker position signal are all effective signals, the first logic judgment unit outputs breaker failure protection to be started; if any one of the starting failure signal, the breaker current signal and the breaker position signal is an invalid signal, the first logic judgment unit does not output breaker failure protection;
when the first logic judgment unit outputs a preparation for opening the breaker failure protection, the second logic judgment unit utilizes the failure opening signal to perform second logic judgment for opening the breaker failure protection; when the starting failure signal is an effective signal, the second logic judgment unit outputs the circuit breaker failure protection to be switched out, and when the starting failure signal is an ineffective signal, the second logic judgment unit does not output the circuit breaker failure protection to be switched out.
Preferably, the first logic judgment unit comprises an and gate;
and (2) carrying out logic AND operation on the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker to obtain the output of the first logic judgment unit, namely:
when the starting failure signal, the breaker current signal and the breaker position signal are all high levels, the first logic judgment unit outputs the high levels, and breaker failure protection is ready to be started;
when any one of the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker is at a low level, the first logic judgment unit outputs the low level, and the circuit breaker failure protection is not opened.
Preferably, the second logic judgment unit is an enable signal port output by the first logic judgment unit, that is, an enable signal port of the and gate;
when the starting failure signal is high level, the circuit breaker failure protection opening logic module outputs a circuit breaker failure protection opening; when the starting failure signal is low level, the circuit breaker failure protection opening logic module does not output a circuit breaker failure protection opening.
Preferably, the second logic judgment unit is a control signal port output by the first logic judgment unit; one end of the second logic unit, which comprises a linked switch, is connected with the output of the first logic judgment unit, and a control signal of the linked switch is a start failure signal; wherein, the linked switch comprises a relay and a normally open switch;
when the starting failure signal is at a high level, the linked switch is conducted, and if the first logic judgment unit outputs the high level, the circuit breaker failure protection output logic module outputs the circuit breaker failure protection output; if the first logic judgment unit outputs a low level, the circuit breaker failure protection opening logic module does not output a circuit breaker failure protection opening;
when the starting failure signal is at a low level, the linked switch is switched off, and the circuit breaker failure protection switching-off logic module does not output a circuit breaker failure protection switching-off.
Compared with the prior art, the invention has the beneficial effects that:
1. the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are still adopted to form the opening logic of the failure protection of the circuit breaker, and a relay protection circuit and an opening logic circuit cannot be added; particularly, when the engineering transformation is oriented, the transformation can be completed only by updating the logic and adding a connecting line or adding a relay or a linked switch and a connecting line without adding any hardware facilities; the occurrence of circuit breaker failure protection misoperation caused by the abnormality such as secondary circuit interference of a circuit breaker failure protection device is effectively avoided, and the workload and the operation and maintenance cost of operation and maintenance personnel are greatly reduced;
2. the circuit breaker failure protection starting failure signal is used as an enabling signal in the circuit breaker failure protection judging logic and can also be used as a control signal of the circuit breaker failure protection starting function; even if the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all satisfied, if the starting failure signal does not exist, the circuit breaker failure protection cannot be exported, and the misoperation of the circuit breaker failure protection is effectively prevented; only the technical means of linkage and enabling are adopted, no external electric quantity is relied on, no complex calculation is needed, the reliability is high, and no refusal action is introduced;
3. the improved method and the improved system can be adopted no matter the breaker is newly built or the breaker which is put into operation is subjected to failure protection transformation, and the misoperation of the breaker failure protection can be effectively prevented by simple operations such as improvement of a linkage switch or a logic algorithm, so that the construction cost and the construction period can be controlled; the invention is easy to deploy and apply for modification, has wide application range and considerable expected popularization and economic benefit.
Drawings
FIG. 1 is a schematic diagram of a prior art circuit breaker failure protection open judgment logic;
FIG. 2 is a block diagram of the steps of the improved method of circuit breaker failure protection against unwanted operation of the present invention;
fig. 3 is a schematic diagram of a circuit breaker malfunction protection open judgment logic circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a circuit breaker malfunction protection open judgment logic circuit according to another embodiment of the present invention;
the reference numerals in fig. 1 to 4 are explained as follows:
1-a relay protection device; 2-start failure signal; 3-current signal of breaker; 4-circuit breaker position signal;
5-trial tripping of a malfunctioning circuit breaker; 6-trip adjacent circuit breakers.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Referring to fig. 2, the invention provides a method for improving the malfunction prevention of a circuit breaker, comprising the following steps:
Specifically, in step 1, for a conventional substation, the breaker current collected by the current transformer is used for judging whether the current flows through the breaker: when the collected breaker current is not zero, judging that the current signal of the breaker is an effective signal, and when the collected breaker current is zero, judging that the current signal of the breaker is an ineffective signal; for the intelligent substation, whether the current of the breaker flows through is judged by using the current signal sent by the merging unit: when the merging unit sends out a current signal, the current signal of the circuit breaker is judged to be an effective signal, and when the merging unit does not send out the current signal, the current signal of the circuit breaker is judged to be an ineffective signal;
for a conventional transformer substation, a circuit breaker position signal acquired by a monitoring sensor of a circuit breaker is used as a circuit breaker position signal for failure protection; for the intelligent substation, the circuit breaker position signals collected by the merging unit are used as circuit breaker position signals for failure protection;
for both a conventional transformer substation and an intelligent transformer substation, a signal sent by a relay protection device is used as a failure starting signal for triggering failure protection; the relay protection device comprises a circuit, a bus and a relay protection device of a transformer;
for a failure starting signal, a current signal of a circuit breaker and a position signal of the circuit breaker, an effective signal is at a high level, and an ineffective signal is at a low level.
Specifically, in step 2, the start failure signal, the breaker current signal and the breaker position signal are subjected to logical and operation to obtain a first logical judgment result, that is:
when the starting failure signal, the breaker current signal and the breaker position signal are all high levels, the first logic judgment result is the high level, and breaker failure protection is ready to be started;
when any one of the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker is at a low level, the first logic judgment result is at a low level, and the circuit breaker failure protection is not opened.
Specifically, in step 3, when the first logic determination result is at a high level, the start-up failure signal is used as an enable signal or a control signal output by the first logic determination result.
Specifically, for an enable signal which is output by taking a start failure signal as a first logic judgment result, when the start failure signal is at a high level, a first logic judgment result is output, namely, the circuit breaker failure protection is started;
when the starting failure signal is at a low level, the first logic judgment result is not output, namely the breaker failure protection is not opened.
Specifically, when the start failure signal is used as the control signal output by the first logic judgment result, and the start failure signal is at a high level, the first logic judgment result output circuit is switched on, that is, the circuit breaker failure protection is switched on;
when the starting failure signal is at a low level, the first logic judgment result output circuit is switched off, namely the circuit breaker failure protection is not switched off.
The invention provides a method for improving the malfunction prevention of the circuit breaker, which comprises two open judgment logic circuits in specific implementation, and comprises the following steps:
1. as shown in fig. 3, the use of the start failure signal as the enable signal for the breaker failure protection can be implemented by modifying the software logic, and the breaker failure protection will send out a high-level action signal if and only if the start failure signal exists;
2. if and only if a circuit breaker failure protection starting failure signal exists, the circuit breaker failure protection starting loop is complete, the action amount can be normally started, otherwise, the circuit breaker failure protection starting loop cannot be started no matter any abnormal signal occurs inside the circuit breaker failure protection starting failure signal, and circuit breaker tripping caused by circuit breaker failure protection misoperation is avoided.
When the starting failure signal, the switch position signal and the switch current signal are all satisfied, the starting failure signal enables the circuit breaker failure protection function or the starting function at the same time, and then the circuit breaker failure protection is started and the corresponding circuit breaker is cut off; when the secondary circuit of the breaker failure protection device is abnormal, the signals after the judgment of the starting failure signal, the switch position signal and the switch current signal are abnormally shifted, at the moment, if the starting failure signal does not exist, the breaker failure protection device still cannot be exported, and the misoperation of the breaker failure protection device is effectively prevented.
The invention also provides a breaker failure protection misoperation prevention improvement system, which comprises: the circuit breaker failure protection switching-out logic module comprises a signal acquisition module and a circuit breaker failure protection switching-out logic module;
the signal acquisition module is used for acquiring a starting failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker;
the circuit breaker failure protection switching-out logic module is used for outputting whether the circuit breaker failure protection is switched out or not according to the switching-on failure signal, the circuit breaker current signal and the circuit breaker position signal;
the circuit breaker failure protection open logic module comprises: a first logic judgment unit and a second logic judgment unit; the first logic judgment unit takes a start failure signal, a breaker current signal and a breaker position signal as input signals, and the second logic judgment unit takes the output of the first logic judgment unit and the start failure signal as input signals;
the first logic judgment unit is used for carrying out first logic judgment on the breaker failure protection by utilizing the failure starting signal, the breaker current signal and the breaker position signal; when the starting failure signal, the breaker current signal and the breaker position signal are all effective signals, the first logic judgment unit outputs breaker failure protection to be started; if any one of the starting failure signal, the breaker current signal and the breaker position signal is an invalid signal, the first logic judgment unit does not output breaker failure protection;
when the first logic judgment unit outputs a preparation for opening the breaker failure protection, the second logic judgment unit utilizes the failure opening signal to perform second logic judgment for opening the breaker failure protection; when the starting failure signal is an effective signal, the second logic judgment unit outputs the circuit breaker failure protection to be switched out, and when the starting failure signal is an ineffective signal, the second logic judgment unit does not output the circuit breaker failure protection to be switched out.
Specifically, the first logic judgment unit comprises an and gate;
and (2) carrying out logic AND operation on the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker to obtain the output of the first logic judgment unit, namely:
when the starting failure signal, the breaker current signal and the breaker position signal are all high levels, the first logic judgment unit outputs the high levels, and breaker failure protection is ready to be started;
when any one of the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker is at a low level, the first logic judgment unit outputs the low level, and the circuit breaker failure protection is not opened.
Specifically, the second logic judgment unit is an enable signal port output by the first logic judgment unit, that is, an enable signal port of the and gate;
when the starting failure signal is high level, the circuit breaker failure protection opening logic module outputs a circuit breaker failure protection opening; when the starting failure signal is low level, the circuit breaker failure protection opening logic module does not output a circuit breaker failure protection opening.
Specifically, the second logic judgment unit is a control signal port output by the first logic judgment unit; one end of the second logic unit, which comprises a linked switch, is connected with the output of the first logic judgment unit, and a control signal of the linked switch is a start failure signal; wherein, the linked switch comprises a relay and a normally open switch;
when the starting failure signal is at a high level, the linked switch is conducted, and if the first logic judgment unit outputs the high level, the circuit breaker failure protection output logic module outputs the circuit breaker failure protection output; if the first logic judgment unit outputs a low level, the circuit breaker failure protection opening logic module does not output a circuit breaker failure protection opening;
when the starting failure signal is at a low level, the linked switch is switched off, and the circuit breaker failure protection switching-off logic module does not output a circuit breaker failure protection switching-off.
Compared with the prior art, the invention has the beneficial effects that:
1. the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are still adopted to form the opening logic of the failure protection of the circuit breaker, and a relay protection circuit and an opening logic circuit cannot be added; particularly, when the engineering transformation is oriented, the transformation can be completed only by updating the logic and adding a connecting line or adding a relay or a linked switch and a connecting line without adding any hardware facilities; the occurrence of circuit breaker failure protection misoperation caused by the abnormality such as secondary circuit interference of a circuit breaker failure protection device is effectively avoided, and the workload and the operation and maintenance cost of operation and maintenance personnel are greatly reduced;
2. the circuit breaker failure protection starting failure signal is used as an enabling signal in the circuit breaker failure protection judging logic and can also be used as a control signal of the circuit breaker failure protection starting function; even if the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all satisfied, if the starting failure signal does not exist, the circuit breaker failure protection cannot be exported, and the misoperation of the circuit breaker failure protection is effectively prevented; only the technical means of linkage and enabling are adopted, no external electric quantity is relied on, no complex calculation is needed, the reliability is high, and no refusal action is introduced;
3. the improved method and the improved system can be adopted no matter the breaker is newly built or the breaker which is put into operation is subjected to failure protection transformation, and the misoperation of the breaker failure protection can be effectively prevented by simple operations such as improvement of a linkage switch or a logic algorithm, so that the construction cost and the construction period can be controlled; the invention is easy to deploy and apply for modification, has wide application range and considerable expected popularization and economic benefit.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. An improved method for preventing misoperation in the failure protection of a circuit breaker, which is suitable for a conventional transformer substation and an intelligent transformer substation, is characterized in that,
the method comprises the following steps:
step 1, collecting a starting failure signal, a current signal of a circuit breaker and a position signal of the circuit breaker;
in a conventional transformer substation, when a current transformer acquires the current of a circuit breaker, a current signal of the circuit breaker is effective, the position of the circuit breaker acquired by a monitoring sensor of the circuit breaker is used as a circuit breaker position signal for failure protection, and a signal sent by a relay protection device is used as a failure starting signal for triggering failure protection;
in the intelligent substation, when the merging unit sends a current signal, a current signal of the circuit breaker is effective, the position of the circuit breaker acquired by the merging unit is used as a circuit breaker position signal for failure protection, and a signal sent by the relay protection device is used as a failure starting signal for triggering failure protection;
step 2, performing first logic judgment of breaker failure protection by using the failure starting signal, the breaker current signal and the breaker position signal; the criterion of the first logic judgment is as follows: when the starting failure signal, the breaker current signal and the breaker position signal are all effective signals, the breaker failure protection is ready to be started, and the step 3 is carried out; if any one of the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker is an invalid signal, the circuit breaker failure protection is not started, and the step 1 is returned;
step 3, when the breaker failure protection is ready to be opened, a second logic judgment of the breaker failure protection opening is carried out by using the opening failure signal; the criterion of the second logic judgment is as follows: when the starting failure signal is an effective signal, the failure protection of the circuit breaker is opened; and when the starting failure signal is an invalid signal, the breaker failure protection is not started, and the step 1 is returned.
2. The improved method of circuit breaker malfunction protection against malfunction as claimed in claim 1,
in the step 1, for a conventional transformer substation, whether current flows through the breaker is judged by using the breaker current collected by the current transformer: when the collected breaker current is not zero, judging that the current signal of the breaker is an effective signal, and when the collected breaker current is zero, judging that the current signal of the breaker is an ineffective signal; for the intelligent substation, whether the current of the breaker flows through is judged by using the current signal sent by the merging unit: when the merging unit sends out a current signal, the current signal of the circuit breaker is judged to be an effective signal, and when the merging unit does not send out the current signal, the current signal of the circuit breaker is judged to be an ineffective signal;
for a conventional transformer substation, the position of a circuit breaker acquired by a monitoring sensor of the circuit breaker is used as a circuit breaker position signal for failure protection; for the intelligent substation, the position of the breaker acquired by the merging unit is used as a breaker position signal for failure protection;
for both a conventional transformer substation and an intelligent transformer substation, a signal sent by a relay protection device is used as a failure starting signal for triggering failure protection; the relay protection device comprises a circuit, a bus and a relay protection device of a transformer;
for a failure starting signal, a current signal of a circuit breaker and a position signal of the circuit breaker, an effective signal is at a high level, and an ineffective signal is at a low level.
3. The improved method of circuit breaker malfunction protection against malfunction as claimed in claim 2,
in step 2, performing logical AND operation on the start failure signal, the breaker current signal and the breaker position signal to obtain a first logical judgment result, namely:
when the starting failure signal, the breaker current signal and the breaker position signal are all high levels, the first logic judgment result is the high level, and breaker failure protection is ready to be started;
when any one of the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker is at a low level, the first logic judgment result is at a low level, and the circuit breaker failure protection is not opened.
4. The improved method of circuit breaker malfunction protection against malfunction according to claim 3,
in step 3, when the first logic judgment result is at a high level, the start-up failure signal is used as an enable signal or a control signal output by the first logic judgment result.
5. The improved method of circuit breaker malfunction protection against malfunction according to claim 4,
when the start failure signal is in a high level, a first logic judgment result is output, namely the circuit breaker failure protection is started;
when the starting failure signal is at a low level, the first logic judgment result is not output, namely the breaker failure protection is not opened.
6. The improved method of circuit breaker malfunction protection against malfunction according to claim 4,
when the start failure signal is used as a control signal output by the first logic judgment result, and the start failure signal is at a high level, the first logic judgment result output loop is conducted, namely the circuit breaker failure protection is started;
when the starting failure signal is at a low level, the first logic judgment result output circuit is switched off, namely the circuit breaker failure protection is not switched off.
7. A circuit breaker malfunction protection malfunction prevention improvement system realized by the circuit breaker malfunction protection malfunction prevention improvement method according to any one of claims 1 to 6,
the system comprises: the circuit breaker failure protection switching-out logic module comprises a signal acquisition module and a circuit breaker failure protection switching-out logic module;
the signal acquisition module is used for acquiring a starting failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker;
the circuit breaker failure protection switching-out logic module is used for outputting whether the circuit breaker failure protection is switched out or not according to the switching-on failure signal, the circuit breaker current signal and the circuit breaker position signal;
the circuit breaker failure protection open logic module comprises: a first logic judgment unit and a second logic judgment unit; the first logic judgment unit takes a start failure signal, a breaker current signal and a breaker position signal as input signals, and the second logic judgment unit takes the output of the first logic judgment unit and the start failure signal as input signals;
the first logic judgment unit is used for carrying out first logic judgment on the breaker failure protection by utilizing the failure starting signal, the breaker current signal and the breaker position signal; when the starting failure signal, the breaker current signal and the breaker position signal are all effective signals, the first logic judgment unit outputs breaker failure protection to be started; if any one of the starting failure signal, the breaker current signal and the breaker position signal is an invalid signal, the first logic judgment unit does not output breaker failure protection;
when the first logic judgment unit outputs a preparation for opening the breaker failure protection, the second logic judgment unit utilizes the failure opening signal to perform second logic judgment for opening the breaker failure protection; when the starting failure signal is an effective signal, the second logic judgment unit outputs the circuit breaker failure protection to be switched out, and when the starting failure signal is an ineffective signal, the second logic judgment unit does not output the circuit breaker failure protection to be switched out.
8. The circuit breaker malfunction protection malfunction prevention improvement system in accordance with claim 7,
the first logic judgment unit comprises an AND gate;
and (2) carrying out logic AND operation on the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker to obtain the output of the first logic judgment unit, namely:
when the starting failure signal, the breaker current signal and the breaker position signal are all high levels, the first logic judgment unit outputs the high levels, and breaker failure protection is ready to be started;
when any one of the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker is at a low level, the first logic judgment unit outputs the low level, and the circuit breaker failure protection is not opened.
9. The circuit breaker malfunction protection malfunction prevention improvement system in accordance with claim 8,
the second logic judgment unit is an enable signal port output by the first logic judgment unit, namely an enable signal port of the AND gate;
when the starting failure signal is high level, the circuit breaker failure protection opening logic module outputs a circuit breaker failure protection opening; when the starting failure signal is low level, the circuit breaker failure protection opening logic module does not output a circuit breaker failure protection opening.
10. The circuit breaker malfunction protection malfunction prevention improvement system in accordance with claim 8,
the second logic judgment unit is a control signal port output by the first logic judgment unit; one end of the second logic unit, which comprises a linked switch, is connected with the output of the first logic judgment unit, and a control signal of the linked switch is a start failure signal; wherein, the linked switch comprises a relay and a normally open switch;
when the starting failure signal is at a high level, the linked switch is conducted, and if the first logic judgment unit outputs the high level, the circuit breaker failure protection output logic module outputs the circuit breaker failure protection output; if the first logic judgment unit outputs a low level, the circuit breaker failure protection opening logic module does not output a circuit breaker failure protection opening;
when the starting failure signal is at a low level, the linked switch is switched off, and the circuit breaker failure protection switching-off logic module does not output a circuit breaker failure protection switching-off.
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