CN114256817B - Improved method and system for preventing malfunction of breaker failure protection - Google Patents
Improved method and system for preventing malfunction of breaker failure protection Download PDFInfo
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- CN114256817B CN114256817B CN202111454262.1A CN202111454262A CN114256817B CN 114256817 B CN114256817 B CN 114256817B CN 202111454262 A CN202111454262 A CN 202111454262A CN 114256817 B CN114256817 B CN 114256817B
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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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- Emergency Protection Circuit Devices (AREA)
Abstract
The method and the system for improving the malfunction protection and malfunction prevention of the circuit breaker take a starting malfunction protection signal as an outlet enabling signal or an outlet control signal of the malfunction protection of the circuit breaker, so as to improve the malfunction protection opening logic of the circuit breaker; 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 the abnormality of secondary circuit interference and the like of a breaker failure protection device can be avoided by only changing the breaker failure protection logic or adding one relay or linkage switch, so that the workload and operation and maintenance cost of operation maintenance personnel are greatly reduced. The application is easy to deploy and apply to reconstruction, has wide application range and considerable expected popularization and economic benefit.
Description
Technical Field
The application belongs to the technical field of relay protection of power systems, and particularly relates to a method and a system for improving malfunction protection and misoperation prevention of a circuit breaker.
Background
The breaker failure protection is taken as an important component part 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 a short circuit is started to fail, adjacent elements cannot be removed, and then under the condition that fault current is removed, the breaker failure protection realizes isolation of fault elements or lines by cutting off the adjacent breakers of the failure breakers, and influences of short circuit faults on elements and systems are eliminated.
The breaker failure protection consists of a voltage blocking 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 operation of the whole set of protection, and is required to be safe and reliable, double judgment should be realized, and the malfunction of the circuit breaker due to single condition judgment and the false starting caused by the fact that the protection contacts are jammed and not returned or are touched by mistake, and the like are prevented. The starting loop comprises a starting element and a judging element; the 2 elements constitute and logic. The starting element usually utilizes the automatic tripping outlet circuit of the circuit breaker, and can directly use the instantaneous return outlet tripping relay contact, and also can be connected with the outlet tripping relay in parallel and an instantaneous return auxiliary intermediate relay contact, wherein the contact action is not reset to indicate the failure of the circuit breaker. The discrimination element discriminates the fault in different ways. The existing operation equipment adopts a 'current' distinguishing mode of phase current (circuit) and zero sequence current (transformer). After the protection action, current still exists in the loop, which indicates that the fault is not eliminated. The time element is an intermediate link of breaker failure protection, and in order to prevent failure protection misoperation caused by single time element failure, the time element and the starting loop should be formed into AND logic, and then the outlet relay is started. The voltage latch-up for failure protection is typically made up of bus low voltage, negative sequence voltage and zero sequence voltage relays. When the failure protection and the bus differential protection share the outlet trip loop, they also share the voltage blocking element.
In the prior art, a judging logic circuit of breaker failure protection is shown in fig. 1, and mainly relies on a start failure signal, a breaker current signal and a breaker position signal sent by relay protection to form a start logic of breaker failure protection, and after the three signals pass through an AND logic, the three signals undergo time delay to trigger the test trip failure breaker. As can be seen from fig. 1, when the judging logic circuit is in operation, when the open failure signal, the breaker current signal and the breaker position signal are simultaneously present, the breaker failure protects the open loop output signal, which is used for cutting all the corresponding breakers.
Since the action condition of the breaker failure protection is severe, the breaker failure protection is generally less likely to be refused, and the situation is fully verified in actual operation. However, in actual operation, a breaker failure protection malfunction event occurs. By analyzing related fault events, the main reason for the malfunction protection malfunction of the circuit breaker is found that stray signals such as interference signals are coupled into the secondary circuit, so that malfunction signals are caused in the opening link, and the malfunction protection malfunction of the circuit breaker is caused. In order to prevent malfunction of the breaker failure protection, in prior art 1 (CN 105914714B) 'method for preventing malfunction of the breaker failure protection based on current waveform recognition', a blocking signal of a breaker trip identification flag is added to original failure logic, and by rapidly recognizing trailing current, an inference is made that the breaker has tripped, the failure protection logic is rapidly blocked, and malfunction of the failure protection due to the trailing current is prevented, and meanwhile, due to short time consumption for recognizing the trailing current logic, inherent action delay of the failure protection can be further shortened when conditions allow. The method in the prior art 1 is mainly used for identifying malfunction protection and malfunction of a circuit breaker, a solution for avoiding malfunction is not proposed, and the identification method is complex and requires a large amount of calculation.
In the prior art 2 (CN 103618296B) 'breaker failure protection locking method', the relationship between the zero sequence current and the negative sequence current after single-phase or two-phase faults occur in the system and the zero sequence current and the negative sequence current of other branches is judged, the failure protection misoperation is prevented, the dependence of using voltage, namely single electric quantity, as a breaker failure protection locking element is eliminated, and the sensitivity and the reliability of the breaker failure protection locking element are improved. The method in the prior art 2 depends on the electrical quantities such as zero sequence current, negative sequence current and the like, so that on one hand, the reliability of a protection function is reduced, and on the other hand, misoperation locking can cause failure protection refusal.
In the prior art 3 (CN 106451328B) 'adaptive breaker failure protection method', the ratio of the amplitude of the direct current component to the amplitude of the fundamental current in the secondary phase current is calculated, the secondary trailing current of the current transformer is judged, the breaker protection device determines and adjusts the threshold value of the failure protection action current according to the ratio of the amplitude of the direct current component to the amplitude of the fundamental current, misoperation is prevented, the contradiction between the quick action and the reliability of the failure protection is effectively solved, the power system is enabled to work stably, and the method has the advantages of quick identification, high accuracy and high reliability. The method provided in the prior art 3 is complex in calculation, and accuracy and reliability are difficult to ensure.
Prior art 4 (CN 212811266U) "a relay protection opening control circuit for preventing malfunction and an application device thereof", where the opening control circuit includes a dual logic control circuit, the dual logic control circuit includes a relay power supply control circuit and an outlet relay control circuit, the relay power supply control circuit is a dual control signal common driving circuit, the outlet relay control circuit is a circuit for controlling a relay coil through a second MOS tube, the dual logic control circuit makes the state of each control signal clear, and in the opening control, the opening malfunction in the product operation can be effectively avoided. Prior art 4 has built a switch-out control circuit which is complicated in structure, has many components, increases construction costs, and is reduced in reliability due to the introduction of new components
To sum up, in order to improve the performance of the breaker failure protection device in the operation process, reduce the power failure accident of the transformer substation caused by the malfunction of the breaker failure protection device, and reduce the economic loss caused by the malfunction of the breaker failure protection device, an improved method for the malfunction protection of the breaker needs to be studied.
Disclosure of Invention
In order to solve the defects existing in the prior art, the application aims to provide an improved method and an improved system for preventing malfunction of a breaker, which are used for improving the opening logic of malfunction protection of the breaker, enabling malfunction protection of the breaker by using a malfunction starting signal, avoiding malfunction protection caused by internal parasitic capacitance current, external electromagnetic interference and the like of a malfunction protection device of the breaker, and being applicable to new and improved projects of the breaker, thereby being beneficial to controlling engineering cost.
The application adopts the following technical scheme.
The improved method for preventing malfunction of the breaker failure protection comprises the following steps:
step 1, collecting a start 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 collects the current of a breaker, a current signal of the breaker is effective, the position of the breaker collected by a monitoring sensor of the breaker is used as a breaker position signal of failure protection, and a signal sent by a relay protection device is used as a failure starting signal for triggering the failure protection;
in the intelligent substation, when the merging unit sends out a current signal, the current signal of the circuit breaker is effective, the position of the circuit breaker collected 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 the failure protection;
step 2, performing first logic judgment of breaker failure protection opening by using a starting failure signal, a breaker current signal and a breaker position signal; the criteria of the first logic judgment are as follows: when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all effective signals, the circuit breaker failure protection is ready to be started, and the step 3 is entered; 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 failure protection of the circuit breaker is not started, and the step 1 is returned;
step 3, when the breaker failure protection is ready to be opened, performing second logic judgment of the breaker failure protection opening by using the failure starting signal; the criterion of the second logic judgment is as follows: when the failure starting signal is a valid signal, the breaker failure protection is started; and when the failure starting signal is an invalid signal, the failure protection of the circuit breaker is not started, and the step 1 is returned.
Preferably, in step 1, for a conventional transformer substation, it is determined whether a current flows through a breaker by using a breaker current acquired by a current transformer: when the acquired current of the circuit breaker is not zero, judging that the current signal of the circuit breaker is an effective signal, and when the acquired current of the circuit breaker is zero, judging that the current signal of the circuit breaker is an ineffective signal; for the intelligent substation, whether the circuit breaker has current to flow or not is judged by utilizing the current signal sent by the merging unit: when the merging unit sends out a current signal, judging that the current signal of the circuit breaker is an effective signal, and when the merging unit does not send out the current signal, judging that the current signal of the circuit breaker is an ineffective signal;
for a conventional transformer substation, using a breaker position signal acquired by a monitoring sensor of a breaker as a breaker position signal for failure protection; for the intelligent substation, the position signals of the circuit breakers collected by the merging unit are used as the position signals of the circuit breakers for failure protection;
for a conventional transformer substation and an intelligent transformer substation, signals sent by a relay protection device are used as starting failure signals for triggering failure protection; the relay protection device comprises a circuit, a bus and a transformer;
for the enable failure signal, the breaker current signal and the breaker position signal, the active signal is high and the inactive signal is low.
Preferably, in step 2, the start failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are logically and operated to obtain a first logic judgment result, namely:
when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all high levels, the first logic judgment result is high level, and the circuit breaker failure protection is ready to be started;
when any one of the start 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 determination result is at the high level, the enable signal or the control signal outputted as the first logic determination result is used as the enable signal or the control signal.
Preferably, for the enable signal that the enable signal outputs as the first logic judgment result, when the enable signal is at the high level, the first logic judgment result, that is, the breaker failure protection is opened, is output;
when the failure starting signal is at a low level, the first logic judgment result is not output, namely the failure protection of the circuit breaker is not started.
Preferably, when the enable failure signal is used as the control signal output by the first logic judgment result, the first logic judgment result output loop is conducted when the enable failure signal is at a high level, namely, the breaker failure protection is opened;
when the failure starting signal is in a low level, the output loop of the first logic judgment result is opened, namely the failure protection of the circuit breaker is not opened.
The malfunction protection and malfunction prevention improvement system of the circuit breaker comprises: the signal acquisition module and the breaker failure protection switching-on logic module;
the signal acquisition module is used for acquiring a start failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker;
the breaker failure protection opening logic module is used for outputting whether the breaker failure protection is opened or not according to the starting failure signal, the breaker current signal and the breaker position signal;
the breaker failure protection opening logic module includes: a first logic judgment unit and a second logic judgment unit; the first logic judging unit takes a start failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker as input signals, and the second logic judging unit takes the output of the first logic judging unit and the start failure signal as input signals;
the first logic judgment unit is used for carrying out first logic judgment of breaker failure protection opening by using a starting failure signal, a breaker current signal and a breaker position signal; when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all effective signals, the first logic judging unit outputs the circuit breaker failure protection to be ready for starting; 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 first logic judging unit does not output the protection of the circuit breaker to be started;
when the first logic judging unit outputs that the breaker failure protection is ready to be opened, the second logic judging unit utilizes the failure starting signal to carry out second logic judgment of the breaker failure protection opening; when the start failure signal is an effective signal, the second logic judging unit outputs the breaker failure protection out, and when the start failure signal is an ineffective signal, the second logic judging unit does not output the breaker failure protection out.
Preferably, the first logic judgment unit includes an and gate;
performing logical AND operation on the start failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker to obtain the output of a first logic judging unit, namely:
when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all high levels, the first logic judging unit outputs the high level, and the circuit breaker failure protection is ready to be started;
when any one of the start 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 judging unit outputs the low level, and the circuit breaker failure protection is not opened.
Preferably, the second logic judging unit is an enabling signal port output by the first logic judging unit, namely an enabling signal port of the and gate;
when the failure starting signal is at a high level, the circuit breaker failure protection opening logic module outputs the circuit breaker failure protection opening; when the enable failure signal is low, the circuit breaker failure protection on-off logic module does not output a circuit breaker failure protection on-off.
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 comprises a linkage switch, the output of the first logic judging unit is connected with one end of the linkage switch, and the control signal of the linkage switch is a start failure signal; the linkage switch comprises a relay and a normally open switch;
when the failure starting signal is at a high level, the linkage switch is conducted, and if the first logic judging unit outputs the high level, the circuit breaker failure protection output by the circuit breaker failure protection output logic module is opened; if the first logic judging unit outputs a low level, the breaker failure protection opening logic module does not output the breaker failure protection opening;
when the start failure signal is at a low level, the linkage switch is turned on, and the breaker failure protection on-off logic module does not output the breaker failure protection on-off.
The application has the beneficial effects that compared with the prior art:
1. the starting logic of the breaker failure protection is formed by the starting failure signal, the breaker current signal and the breaker position signal, and a relay protection circuit and a starting logic circuit are not added; especially when facing engineering transformation, the transformation can be completed by only updating the opening logic and adding a connecting line or adding a relay or a linkage switch and a connecting line without adding any hardware facilities; the occurrence of malfunction protection of the breaker caused by the abnormality such as the interference of a secondary circuit of the malfunction protection device of the breaker is effectively avoided, and the workload and the operation and maintenance cost of operation maintenance personnel are greatly reduced;
2. the breaker failure protection starting failure signal is used as an enabling signal in breaker failure protection judging logic, and can be used as a control signal of a 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, the circuit breaker failure protection will not be exported if the starting failure signal is not present, thereby effectively preventing the misoperation of the circuit breaker failure protection; only adopts the linkage and enabling technical means, does not depend on any external electric quantity, does not need complex calculation, has high reliability, and does not introduce refusal action;
3. the improved method and the system can be adopted to effectively prevent the malfunction protection of the circuit breaker through simple operations such as improvement of a linkage switch or a logic algorithm, and the like, thereby being beneficial to controlling the engineering cost and the construction period; the application is easy to deploy and apply to reconstruction, has wide application range and considerable expected popularization and economic benefit.
Drawings
FIG. 1 is a schematic diagram of a conventional circuit breaker failure protection opening judgment logic circuit;
FIG. 2 is a block diagram of steps of the improved method for malfunction protection and malfunction prevention of a circuit breaker of the present application;
FIG. 3 is a schematic diagram of improved circuit breaker failure protection decision logic in accordance with one embodiment of the present application;
FIG. 4 is a schematic diagram of improved circuit breaker failure protection decision logic in accordance with another embodiment of the present application;
reference numerals in fig. 1 to 4 are explained as follows:
1-a relay protection device; 2-enable failure signal; 3-circuit breaker has a flow signal; 4-breaker position signal;
5-test trip failure circuit breaker; 6-tripping the adjacent circuit breaker.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
As shown in fig. 2, the method for improving malfunction protection and malfunction prevention of a circuit breaker provided by the application comprises the following steps:
step 1, a start failure signal 2, a breaker current signal 3 and a breaker position signal 4 are collected.
Specifically, in step 1, for a conventional transformer substation, judging whether a current flows through a breaker by using a breaker current acquired by a current transformer: when the acquired current of the circuit breaker is not zero, judging that the current signal of the circuit breaker is an effective signal, and when the acquired current of the circuit breaker is zero, judging that the current signal of the circuit breaker is an ineffective signal; for the intelligent substation, whether the circuit breaker has current to flow or not is judged by utilizing the current signal sent by the merging unit: when the merging unit sends out a current signal, judging that the current signal of the circuit breaker is an effective signal, and when the merging unit does not send out the current signal, judging that the current signal of the circuit breaker is an ineffective signal;
for a conventional transformer substation, using a breaker position signal acquired by a monitoring sensor of a breaker as a breaker position signal for failure protection; for the intelligent substation, the position signals of the circuit breakers collected by the merging unit are used as the position signals of the circuit breakers for failure protection;
for a conventional transformer substation and an intelligent transformer substation, signals sent by a relay protection device are used as starting failure signals for triggering failure protection; the relay protection device comprises a circuit, a bus and a transformer;
for the enable failure signal, the breaker current signal and the breaker position signal, the active signal is high and the inactive signal is low.
Step 2, performing first logic judgment of breaker failure protection opening by using a starting failure signal, a breaker current signal and a breaker position signal; the criteria of the first logic judgment are as follows: when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all effective signals, the circuit breaker failure protection is ready to be started, and the step 3 is entered; and 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 failure protection of the circuit breaker is not started, and the step 1 is returned.
Specifically, in step 2, a logic and operation is performed on the start failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker to obtain a first logic judgment result, namely:
when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all high levels, the first logic judgment result is high level, and the circuit breaker failure protection is ready to be started;
when any one of the start 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.
Step 3, when the breaker failure protection is ready to be opened, performing second logic judgment of the breaker failure protection opening by using the failure starting signal; the criterion of the second logic judgment is as follows: when the failure starting signal is a valid signal, the breaker failure protection is started; and when the failure starting signal is an invalid signal, the failure protection of the circuit breaker is not started, and the step 1 is returned.
Specifically, in step 3, when the first logic determination result is at the high level, the enable signal or the control signal outputted as the first logic determination result is used as the enable signal or the control signal.
Specifically, for the enable signal that the enable signal outputs as the first logic judgment result, when the enable signal is at the high level, the first logic judgment result, that is, the breaker failure protection is opened, is output;
when the failure starting signal is at a low level, the first logic judgment result is not output, namely the failure protection of the circuit breaker is not started.
Specifically, when the start failure signal is used as a control signal output by the first logic judgment result, the first logic judgment result output loop is conducted when the start failure signal is at a high level, namely, the breaker failure protection is opened;
when the failure starting signal is in a low level, the output loop of the first logic judgment result is opened, namely the failure protection of the circuit breaker is not opened.
The application provides an improved method for malfunction protection and misoperation prevention of a circuit breaker, which comprises two open judgment logic circuits when in specific implementation, and comprises the following steps:
1. as shown in fig. 3, using the enable signal as an enable signal for the breaker failure protection can be accomplished by modifying the software logic such that the breaker failure protection will issue a high level of the action signal if and only if the enable signal is present;
2. as shown in figure 4, the scheme of controlling the opening of the failure protection action quantity by using the linkage switch is utilized, if and only if a breaker failure protection opening failure signal exists, the breaker failure protection opening loop is complete, the action quantity can be normally opened, otherwise, no matter any abnormal signal appears in the interior, the opening cannot be realized, and the tripping of the breaker caused by the breaker failure protection misoperation is avoided.
The two switching-out judging logic circuits can be realized, when the starting failure signal, the switch position signal and the switch current signal are all satisfied, the starting failure signal enables the breaker failure protection function or the switching-out function, and then the breaker failure protection is switched out and the corresponding breaker is switched off; when the secondary circuit of the breaker failure protection device is abnormal, the signals after the starting failure signal, the switch position signal and the switch current signal are judged are abnormal and shifted, and at the moment, if no starting failure signal exists, the breaker failure protection will not be exported, and the misoperation of the breaker failure protection is effectively prevented.
The application also provides a malfunction protection and malfunction prevention improvement system of the circuit breaker, which comprises: the signal acquisition module and the breaker failure protection switching-on logic module;
the signal acquisition module is used for acquiring a start failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker;
the breaker failure protection opening logic module is used for outputting whether the breaker failure protection is opened or not according to the starting failure signal, the breaker current signal and the breaker position signal;
the breaker failure protection opening logic module includes: a first logic judgment unit and a second logic judgment unit; the first logic judging unit takes a start failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker as input signals, and the second logic judging unit takes the output of the first logic judging unit and the start failure signal as input signals;
the first logic judgment unit is used for carrying out first logic judgment of breaker failure protection opening by using a starting failure signal, a breaker current signal and a breaker position signal; when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all effective signals, the first logic judging unit outputs the circuit breaker failure protection to be ready for starting; 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 first logic judging unit does not output the protection of the circuit breaker to be started;
when the first logic judging unit outputs that the breaker failure protection is ready to be opened, the second logic judging unit utilizes the failure starting signal to carry out second logic judgment of the breaker failure protection opening; when the start failure signal is an effective signal, the second logic judging unit outputs the breaker failure protection out, and when the start failure signal is an ineffective signal, the second logic judging unit does not output the breaker failure protection out.
Specifically, the first logic judgment unit includes an and gate;
performing logical AND operation on the start failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker to obtain the output of a first logic judging unit, namely:
when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all high levels, the first logic judging unit outputs the high level, and the circuit breaker failure protection is ready to be started;
when any one of the start 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 judging unit outputs the low level, and the circuit breaker failure protection is not opened.
Specifically, the second logic judging unit is an enabling signal port output by the first logic judging unit, namely an enabling signal port of the AND gate;
when the failure starting signal is at a high level, the circuit breaker failure protection opening logic module outputs the circuit breaker failure protection opening; when the enable failure signal is low, the circuit breaker failure protection on-off logic module does not output a circuit breaker failure protection on-off.
Specifically, the second logic judging unit is a control signal port output by the first logic judging unit; one end of the second logic unit comprises a linkage switch, the output of the first logic judging unit is connected with one end of the linkage switch, and the control signal of the linkage switch is a start failure signal; the linkage switch comprises a relay and a normally open switch;
when the failure starting signal is at a high level, the linkage switch is conducted, and if the first logic judging unit outputs the high level, the circuit breaker failure protection output by the circuit breaker failure protection output logic module is opened; if the first logic judging unit outputs a low level, the breaker failure protection opening logic module does not output the breaker failure protection opening;
when the start failure signal is at a low level, the linkage switch is turned on, and the breaker failure protection on-off logic module does not output the breaker failure protection on-off.
The application has the beneficial effects that compared with the prior art:
1. the starting logic of the breaker failure protection is formed by the starting failure signal, the breaker current signal and the breaker position signal, and a relay protection circuit and a starting logic circuit are not added; especially when facing engineering transformation, the transformation can be completed by only updating the opening logic and adding a connecting line or adding a relay or a linkage switch and a connecting line without adding any hardware facilities; the occurrence of malfunction protection of the breaker caused by the abnormality such as the interference of a secondary circuit of the malfunction protection device of the breaker is effectively avoided, and the workload and the operation and maintenance cost of operation maintenance personnel are greatly reduced;
2. the breaker failure protection starting failure signal is used as an enabling signal in breaker failure protection judging logic, and can be used as a control signal of a 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, the circuit breaker failure protection will not be exported if the starting failure signal is not present, thereby effectively preventing the misoperation of the circuit breaker failure protection; only adopts the linkage and enabling technical means, does not depend on any external electric quantity, does not need complex calculation, has high reliability, and does not introduce refusal action;
3. the improved method and the system can be adopted to effectively prevent the malfunction protection of the circuit breaker through simple operations such as improvement of a linkage switch or a logic algorithm, and the like, thereby being beneficial to controlling the engineering cost and the construction period; the application is easy to deploy and apply to reconstruction, has wide application range and considerable expected popularization and economic benefit.
While the applicant has described and illustrated the embodiments of the present application in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present application, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present application, and not to limit the scope of the present application, but any improvements or modifications based on the spirit of the present application should fall within the scope of the present application.
Claims (10)
1. The improved method for preventing misoperation of breaker failure protection is suitable for conventional substations and intelligent substations and is characterized in that,
the method comprises the following steps:
step 1, collecting a start 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 collects the current of a breaker, a current signal of the breaker is effective, the position of the breaker collected by a monitoring sensor of the breaker is used as a breaker position signal of failure protection, and a signal sent by a relay protection device is used as a failure starting signal for triggering the failure protection;
in the intelligent substation, when the merging unit sends out a current signal, the current signal of the circuit breaker is effective, the position of the circuit breaker collected 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 the failure protection;
step 2, performing first logic judgment of breaker failure protection opening by using a starting failure signal, a breaker current signal and a breaker position signal; the criteria of the first logic judgment are as follows: when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all effective signals, the circuit breaker failure protection is ready to be started, and the step 3 is entered; 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 failure protection of the circuit breaker is not started, and the step 1 is returned;
step 3, when the breaker failure protection is ready to be opened, performing second logic judgment of the breaker failure protection opening by using the failure starting signal; the criterion of the second logic judgment is as follows: when the failure starting signal is a valid signal, the breaker failure protection is started; and when the failure starting signal is an invalid signal, the failure protection of the circuit breaker is not started, and the step 1 is returned.
2. The improvement method for malfunction protection and malfunction prevention of a circuit breaker according to claim 1, characterized in that,
in step 1, for a conventional transformer substation, judging whether a current flows through a breaker by using the breaker current acquired by a current transformer: when the acquired current of the circuit breaker is not zero, judging that the current signal of the circuit breaker is an effective signal, and when the acquired current of the circuit breaker is zero, judging that the current signal of the circuit breaker is an ineffective signal; for the intelligent substation, whether the circuit breaker has current to flow or not is judged by utilizing the current signal sent by the merging unit: when the merging unit sends out a current signal, judging that the current signal of the circuit breaker is an effective signal, and when the merging unit does not send out the current signal, judging that the current signal of the circuit breaker is an ineffective signal;
for a conventional transformer substation, using a breaker position acquired by a monitoring sensor of a breaker as a breaker position signal for failure protection; for the intelligent substation, the position of the circuit breaker collected by the merging unit is used as a circuit breaker position signal for failure protection;
for a conventional transformer substation and an intelligent transformer substation, signals sent by a relay protection device are used as starting failure signals for triggering failure protection; the relay protection device comprises a circuit, a bus and a transformer;
for the enable failure signal, the breaker current signal and the breaker position signal, the active signal is high and the inactive signal is low.
3. The improvement method for malfunction protection and malfunction prevention of a circuit breaker according to claim 2, characterized in that,
in step 2, performing logical and operation on the start failure signal, the current signal of the breaker and the position signal of the breaker to obtain a first logical judgment result, namely:
when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all high levels, the first logic judgment result is high level, and the circuit breaker failure protection is ready to be started;
when any one of the start 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 improvement of malfunction protection and malfunction prevention for circuit breaker according to claim 3, characterized in that,
in step 3, when the first logic determination result is at the high level, the enable signal or the control signal outputted by the first logic determination result is used as the enable signal or the control signal.
5. The improvement of malfunction protection and malfunction prevention for circuit breaker according to claim 4, characterized in that,
for an enabling signal which is output by taking the starting failure signal as a first logic judgment result, when the starting failure signal is at a high level, outputting the first logic judgment result, namely, the breaker failure protection is started;
when the failure starting signal is at a low level, the first logic judgment result is not output, namely the failure protection of the circuit breaker is not started.
6. The improvement of malfunction protection and malfunction prevention for circuit breaker according to claim 4, characterized in that,
when the start failure signal is used as a control signal output by the first logic judgment result, the first logic judgment result output loop is conducted when the start failure signal is at a high level, namely, the breaker failure protection is opened;
when the failure starting signal is in a low level, the output loop of the first logic judgment result is opened, namely the failure protection of the circuit breaker is not opened.
7. A malfunction protection and malfunction prevention improvement system for a circuit breaker, which is realized by the malfunction protection and malfunction prevention improvement method for a circuit breaker according to any one of claims 1 to 6,
the system comprises: the signal acquisition module and the breaker failure protection switching-on logic module;
the signal acquisition module is used for acquiring a start failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker;
the breaker failure protection opening logic module is used for outputting whether the breaker failure protection is opened or not according to the starting failure signal, the breaker current signal and the breaker position signal;
the breaker failure protection opening logic module includes: a first logic judgment unit and a second logic judgment unit; the first logic judging unit takes a start failure signal, a current signal of the circuit breaker and a position signal of the circuit breaker as input signals, and the second logic judging unit takes the output of the first logic judging unit and the start failure signal as input signals;
the first logic judgment unit is used for carrying out first logic judgment of breaker failure protection opening by using a starting failure signal, a breaker current signal and a breaker position signal; when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all effective signals, the first logic judging unit outputs the circuit breaker failure protection to be ready for starting; 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 first logic judging unit does not output the protection of the circuit breaker to be started;
when the first logic judging unit outputs that the breaker failure protection is ready to be opened, the second logic judging unit utilizes the failure starting signal to carry out second logic judgment of the breaker failure protection opening; when the start failure signal is an effective signal, the second logic judging unit outputs the breaker failure protection out, and when the start failure signal is an ineffective signal, the second logic judging unit does not output the breaker failure protection out.
8. The improved system for protecting against malfunction of a circuit breaker as recited in claim 7, wherein,
the first logic judging unit comprises an AND gate;
performing logical AND operation on the start failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker to obtain the output of a first logic judging unit, namely:
when the starting failure signal, the current signal of the circuit breaker and the position signal of the circuit breaker are all high levels, the first logic judging unit outputs the high level, and the circuit breaker failure protection is ready to be started;
when any one of the start 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 judging unit outputs the low level, and the circuit breaker failure protection is not opened.
9. The improved system for protecting against malfunction of a circuit breaker as recited in claim 8, wherein,
the second logic judging unit is an enabling signal port output by the first logic judging unit, namely an enabling signal port of the AND gate;
when the failure starting signal is at a high level, the circuit breaker failure protection opening logic module outputs the circuit breaker failure protection opening; when the enable failure signal is low, the circuit breaker failure protection on-off logic module does not output a circuit breaker failure protection on-off.
10. The improved system for protecting against malfunction of a circuit breaker as recited in claim 8, wherein,
the second logic judging unit is a control signal port output by the first logic judging unit; one end of the second logic unit comprises a linkage switch, the output of the first logic judging unit is connected with one end of the linkage switch, and the control signal of the linkage switch is a start failure signal; the linkage switch comprises a relay and a normally open switch;
when the failure starting signal is at a high level, the linkage switch is conducted, and if the first logic judging unit outputs the high level, the circuit breaker failure protection output by the circuit breaker failure protection output logic module is opened; if the first logic judging unit outputs a low level, the breaker failure protection opening logic module does not output the breaker failure protection opening;
when the start failure signal is at a low level, the linkage switch is turned on, and the breaker failure protection on-off logic module does not output the breaker failure protection on-off.
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