Circuit breaker opening and closing coil protection method matched with action of relay protection device

Abstract

The invention relates to the technical field of power system automation, and provides a circuit breaker opening and closing coil protection method matched with action of a relay protection device, which comprises the following steps of: connecting a current relay in a circuit breaker opening and closing coil control loop in series, and judging the working current of the circuit breaker opening and closing coil by matching with the relay protection device; a normally-closed contact of the contactor is connected in series in a circuit breaker opening and closing coil control loop, and the relay protection device judges the working state of the circuit breaker opening and closing coil control loop based on the current relay. And when the working state of the circuit breaker opening and closing coil control loop is judged to be abnormal and protection action is needed, the circuit breaker opening and closing coil loop is disconnected through the control contactor. According to the invention, closed-loop monitoring of opening and closing output signals can be increased; when the opening and closing operation is confirmed to be abnormal, the contactor is driven to open the opening and closing coil control loop to realize circuit breaker opening and closing coil protection; three alarm forms are newly added, so that a user can solve problems in a targeted manner.

Description

Technical Field

[0001] The invention relates to the technical field of power system automation, and in particular to a circuit breaker opening and closing coil protection method coordinated with the action of a relay protection device. Background Art

[0002] In the power system automation protection technology, the circuit breaker is a key primary device of the power system, which can cut off the fault current. The normal operation of its opening and closing coil is extremely important. However, in actual engineering use, the opening and closing coil is often burned due to long-term power-on due to the failure of tripping and closing. This not only increases the time and cost of on-site maintenance, but also may have a serious impact on the safe operation of the power system, and even cause the accident to expand beyond the level. In response to this problem, the current mainstream relay protection device does not protect the circuit breaker opening and closing coil, but only provides its coil drive signal when the circuit breaker needs to open and close. It is mainly considered that adding a primary circuit device will reduce the reliability of the system, which is especially critical in high-voltage systems. In low-voltage systems, in response to this problem, the current solution is usually to add time relays, contactors, etc. to the circuit breaker operation circuit for on-off control. The former realizes timing control and the latter realizes arc extinguishing and cutting. This solution is completely independent of the protection device. When an abnormality occurs, it is impossible to provide alarm information in time to facilitate users to repair the problem. Summary of the invention

[0003] The object of the present invention is to solve at least one technical problem in the background technology and to provide a circuit breaker opening and closing coil protection method that cooperates with the action of a relay protection device.

[0004] To achieve the above object, the present invention provides a circuit breaker opening and closing coil protection method that cooperates with the action of a relay protection device, comprising:

[0005] Connect the current relay in series in the circuit breaker opening and closing coil control circuit, and cooperate with the relay protection device to realize the judgment of the circuit breaker opening and closing coil working current;

[0006] The normally closed contacts of the contactor are connected in series in the circuit breaker opening and closing coil control circuit. The relay protection device determines the working state of the circuit breaker opening and closing coil control circuit based on the current relay. When it is determined that the working state of the circuit breaker opening and closing coil control circuit is abnormal and protection action is required, the circuit breaker opening and closing coil circuit is disconnected by controlling the contactor.

[0007] According to one aspect of the present invention, the current relay is used in conjunction with the relay protection device to determine the working current of the circuit breaker opening and closing coil:

[0008] The relay protection device issues a closing and opening command to control the operation of the closing and opening coil control circuit of the circuit breaker. When the closing and opening coil control circuit of the circuit breaker is normally connected and abnormally maintained, the current relay operates. The operation information is transmitted to the relay protection device through the closing of the current relay contacts.

[0009] According to one aspect of the present invention, while the relay protection device issues a closing and opening command to control the operation of the closing and opening coil control circuit of the circuit breaker, it determines the working state of the closing and opening coil control circuit of the circuit breaker according to the time parameter of the protection action of the closing and opening coil of the circuit breaker configured therein and the feedback information of the current relay contacts, and then executes the protection action according to the determination result.

[0010] According to one aspect of the present invention, the relay protection device determines the working state of the closing and opening coil control circuit of the circuit breaker according to the time parameter of the protection action of the closing and opening coil of the circuit breaker configured therein and the feedback information of the current relay contacts, and then executes the protection action according to the determination result, including:

[0011] Within the set time limit after the relay protection device issues a closing and opening action command, if the relay protection device receives the closing signal of the current relay contacts, it is regarded as a correct action feedback; otherwise, the relay protection device outputs an alarm message indicating that the closing and opening command action is abnormal to the user.

[0012] Under normal circumstances, the current relay loses power due to the completion of the closing and opening operation of the circuit breaker. The relay protection device receives the signal that the contacts of the current relay are separated. At this time, it is determined that the closing and opening coil control circuit of the circuit breaker is normal, and the relay protection device does not need to perform additional operations.

[0013] Under abnormal circumstances, the current relay remains powered on due to the failure of the closing and opening operation. When the relay protection device finds that the contacts of the current relay do not change position beyond the set time limit, it is determined that the closing and opening coil control circuit of the circuit breaker is abnormal, and the relay protection device executes the protection action of the closing and opening coil of the circuit breaker.

[0014] According to one aspect of the present invention, the relay protection device executes the protection action of the closing and opening coil of the circuit breaker, including:

[0015] Drive the internal relay to operate. The operation of this relay will drive the contactor to operate. The operation of the contactor separates its normally closed contacts connected in series in the closing and opening control circuit of the circuit breaker. The separation of the normally closed contacts causes the closing and opening coil of the circuit breaker to lose power, meeting the requirement of short-time power-on of the closing and opening coil of the circuit breaker and realizing the protection function of the closing and opening coil of the circuit breaker.

[0016] Output an alarm message indicating the protection action of the closing and opening coil of the circuit breaker to the user, and prevent the closing and opening action signal of the circuit breaker from appearing again.

[0017] According to an aspect of the present invention, it further includes: after the relay protection device executes the protection action for the circuit breaker closing and opening coils, it continues to monitor the contact displacement information of the current relay. When the set time limit is exceeded and the contacts of the current relay do not displace, an alarm signal indicating the failure of the protection for the circuit breaker closing and opening coils is output to the user.

[0018] To achieve the above object, the present invention further provides a protection system for a circuit breaker closing and opening coil that cooperates with the operation of a relay protection device, including:

[0019] A working current judgment module, which connects a current relay in series in the control circuit of the circuit breaker closing and opening coils to cooperate with the relay protection device to judge the working current of the circuit breaker closing and opening coils;

[0020] A protection action judgment and execution module, which connects the normally closed contacts of a contactor in series in the control circuit of the circuit breaker closing and opening coils. The relay protection device determines the working state of the control circuit of the circuit breaker closing and opening coils based on the current relay. When it is determined that the working state of the control circuit of the circuit breaker closing and opening coils is abnormal and protection action is required, the circuit breaker closing and opening coil circuit is disconnected by controlling the contactor.

[0021] To achieve the above object, the present invention further provides an electronic device, including a processor, a memory, and a computer program stored on the memory and executable on the processor. When the computer program is executed by the processor, it implements the method for protecting the circuit breaker closing and opening coils that cooperates with the operation of the relay protection device as described above.

[0022] To achieve the above object, the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the method for protecting the circuit breaker closing and opening coils that cooperates with the operation of the relay protection device as described above.

[0023] According to the solution of the present invention, the method for protecting the opening and closing coils of a circuit breaker in cooperation with the operation of a relay protection device provided by the present invention can provide users with an optional built-in form of protection function for the opening and closing coils of the circuit breaker without making hardware modifications to the existing relay protection device. This protection function on the relay protection device can be configured to be enabled or disabled. When it is not enabled, it is exactly the same as the original product and has no impact on the original functions of the protection device. After enabling this protection function and externally cooperating with two current relays and two contactors, the following can be achieved after correct wiring: 1) Add closed-loop monitoring of the opening and closing output signals; 2) When it is confirmed that the opening and closing operation is abnormal, drive the contactor to operate to disconnect the control circuit of the opening and closing coils to achieve protection for the opening and closing coils of the circuit breaker; 3) Add three new warning forms to facilitate users to solve problems targeted. Using the method of the present invention to achieve protection for the opening and closing coils of the circuit breaker can make full use of the existing hardware resources and high-precision control timing of the relay protection device, and software support can be achieved by upgrading the program of the on-site operating product; the wiring modification of the circuit breaker coil control circuit in terms of hardware wiring is very small, avoiding the use of devices such as time relays and current sensors, and correspondingly improving the overall operation reliability of the system. Brief Description of the Drawings

[0024] Figure 1 Schematically showing a flowchart of a method for protecting the opening and closing coils of a circuit breaker in cooperation with the operation of a relay protection device according to an embodiment of the present invention;

[0025] Figure 2 The wiring diagram of the operating system for realizing protection of the opening and closing coils of a circuit breaker in cooperation with the operation of a relay protection device in Embodiment 1;

[0026] Figure 3 The timing diagrams of normal / abnormal operation of relevant relays when the protection function of the relay protection device is enabled in Embodiment 1. Detailed Embodiments

[0027] Now, the content of the present invention will be discussed with reference to exemplary embodiments. It should be understood that the discussed embodiments are only for enabling those of ordinary skill in the art to better understand and thus implement the content of the present invention, rather than implying any limitation to the scope of the present invention.

[0028] As used herein, the term "including" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "an embodiment" and "a kind of embodiment" are to be construed as "at least one embodiment".

[0029] Figure 1 Schematically showing a flowchart of a method for protecting the opening and closing coils of a circuit breaker in cooperation with the operation of a relay protection device according to an embodiment of the present invention. As Figure 1As shown, in this embodiment, a method for protecting the closing and opening coils of a circuit breaker in coordination with a relay protection device includes:

[0030] A current relay is connected in series in the control circuit of the closing and opening coils of the circuit breaker to cooperate with the relay protection device to judge the working current of the closing and opening coils of the circuit breaker;

[0031] The normally closed contact of the contactor is connected in series in the control circuit of the closing and opening coils of the circuit breaker. The relay protection device determines the working state of the control circuit of the closing and opening coils of the circuit breaker based on the current relay. When it is determined that the working state of the control circuit of the closing and opening coils of the circuit breaker is abnormal and protection action is required, the contactor is controlled to disconnect the circuit of the closing and opening coils of the circuit breaker.

[0032] Furthermore, according to an embodiment of the present invention, the cooperation between the current relay and the relay protection device to judge the working current of the closing and opening coils of the circuit breaker is as follows:

[0033] The relay protection device issues a closing and opening command to control the action of the control circuit of the closing and opening coils of the circuit breaker. The current relay operates both when the control circuit of the closing and opening coils of the circuit breaker is normally connected and when it is abnormally maintained. The action information is transmitted to the relay protection device through the closing of the contacts of the current relay.

[0034] Furthermore, according to an embodiment of the present invention, while the relay protection device issues a closing and opening command to control the action of the control circuit of the closing and opening coils of the circuit breaker, it determines the working state of the control circuit of the closing and opening coils of the circuit breaker according to the time parameter of the protection action of the closing and opening coils of the circuit breaker configured therein and the contact feedback information of the current relay, and then executes the protection action according to the determination result.

[0035] Furthermore, according to an embodiment of the present invention, the relay protection device determines the working state of the control circuit of the closing and opening coils of the circuit breaker according to the time parameter of the protection action of the closing and opening coils of the circuit breaker configured therein and the contact feedback information of the current relay, and then executes the protection action according to the determination result, including:

[0036] Within the set time limit after the relay protection device issues a closing and opening action command, if the relay protection device receives the closing signal of the contacts of the current relay, it is regarded as a correct action feedback; otherwise, the relay protection device outputs an alarm message indicating that the closing and opening command action is abnormal to the user;

[0037] Under normal circumstances, the current relay loses power due to the completion of the closing and opening operation of the circuit breaker, and the relay protection device receives the signal that the contacts of the current relay are separated. At this time, it is determined that the control circuit of the closing and opening coils of the circuit breaker is normal, and the relay protection device does not need to perform additional operations;

[0038] In the event of an abnormal situation, the current relay remains powered on continuously due to the failure of the opening and closing operations. When the relay protection device detects that the contacts of the current relay have not changed position after exceeding the set time limit, it determines that the control circuit of the breaker opening and closing coil is abnormal, and the relay protection device executes the protection action for the breaker opening and closing coil.

[0039] Further, according to an embodiment of the present invention, the relay protection device executing the protection action for the breaker opening and closing coil includes:

[0040] Driving the internal relay to act, and the action of this relay will drive the contactor to act. The action of the contactor separates the normally closed contacts connected in series in the breaker opening and closing control circuit. The separation of the normally closed contacts causes the breaker opening and closing coil to lose power, realizing the requirement of short-time power-on for the breaker opening and closing coil and achieving the protection function of the breaker opening and closing coil;

[0041] Outputting an alarm message of the protection action for the breaker opening and closing coil to the user and preventing the breaker opening and closing action signal from appearing again.

[0042] Further, according to an embodiment of the present invention, it further includes: after the relay protection device executes the protection action for the breaker opening and closing coil, it continues to monitor the contact position change information of the current relay. When the set time limit is exceeded and the contacts of the current relay have not changed position, an alarm signal indicating the failure of the protection for the breaker opening and closing coil is output to the user.

[0043] According to the above solution of the present invention, the method for protecting the breaker opening and closing coil in cooperation with the relay protection device provided by the present invention can provide an optional built-in form of the protection function for the breaker opening and closing coil to the user without making hardware modifications to the existing relay protection device. This protection function on the relay protection device can be configured to be enabled or disabled. When it is not enabled, it is exactly the same as the original product and does not have any impact on the original functions of the protection device; after enabling this protection function, with two external current relays and two contactors properly wired, the following can be achieved: 1) increasing the closed-loop monitoring of the opening and closing output signals; 2) driving the contactor to act to disconnect the opening and closing coil control circuit when it is confirmed that the opening and closing operation is abnormal, realizing the protection of the breaker opening and closing coil; 3) adding three new alarm forms to facilitate the user to solve problems targeted. Using the method of the present invention to achieve the protection of the breaker opening and closing coil can make full use of the existing hardware resources and high-precision control timing of the relay protection device, and software support can be achieved by upgrading the program of the on-site operating product; the wiring modification of the breaker coil control circuit in terms of hardware connection is very small, avoiding the use of devices such as time relays and current sensors, and correspondingly improving the overall operation reliability of the system.

[0044] Further, to achieve the above object, the present invention also provides a system for protecting the breaker opening and closing coil in cooperation with the relay protection device, including:

[0045] The working current judgment module connects the current relay in series in the control circuit of the breaker closing and opening coils, and cooperates with the relay protection device to judge the working current of the breaker closing and opening coils;

[0046] The protection action judgment and execution module connects the normally closed contact of the contactor in series in the control circuit of the breaker closing and opening coils. The relay protection device judges the working state of the control circuit of the breaker closing and opening coils based on the current relay. When it is determined that the working state of the control circuit of the breaker closing and opening coils is abnormal and protection action is required, the breaker closing and opening coil circuit is disconnected by controlling the contactor.

[0047] The breaker closing and opening coil protection system that works with the relay protection device according to the present invention can implement the breaker closing and opening coil protection method that cooperates with the relay protection device to act. The specific process steps are as described above and will not be repeated.

[0048] Furthermore, to achieve the above object, the present invention also provides an electronic device, including a processor, a memory, and a computer program stored on the memory and executable on the processor. When the computer program is executed by the processor, it implements the breaker closing and opening coil protection method that works with the relay protection device as described above.

[0049] Furthermore, to achieve the above object, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by the processor, it implements the breaker closing and opening coil protection method that works with the relay protection device as described above.

[0050] To make the object, technical solution, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only the best embodiments of the present invention, only used to explain the present invention, and do not limit the protection scope of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0051] Embodiment 1

[0052] Figure 2 The operating system wiring diagram for implementing the breaker closing and opening coil protection by cooperating with the relay protection device in Embodiment 1. The relay protection device is connected to the current relay, contactor, and breaker operating mechanism circuit as Figure 2As shown in the figure, the newly added components and wiring in the design are within the dashed box. J1 and J3 are current relays, and J1a and J3a are the normally open contacts of the corresponding relays; J2 and J4 are contactors, and J2a and J4a are the normally closed contacts of the corresponding contactors. CKJ1 and CKJ2 are the redundant standby output contacts inside the relay protection device, which are used for the protection action output of the breaker closing and opening coils at this time.

[0053] The current relays and contactors can be purchased as industrial-grade components on the market. When selecting, it is necessary to pay attention to their rated working current and working voltage information and confirm that they meet the working scenario.

[0054] The action time for the breaker closing and opening operating mechanism to complete the action is generally 40 - 200 ms, that is Figure 2 in which DL1 and DL2 are disconnected within this time after the closing and opening operations start. Here, it is assumed to be 200 ms; the continuous power-on time that the breaker closing and opening coils can withstand is generally 2 - 4 s. Here, it is assumed to be 2 s, corresponding to Figure 2 in which TQ and HQ are considered to have burned out when the continuous power-on exceeds 2 s.

[0055] The operating software of the relay protection device has a parameter configuration function. According to the action time of 200 ms and the maximum tolerable time of 2 s for the protection object (breaker closing and opening coils), two parameters are set:

[0056] The protection action time for the closing and opening mechanism is 1.1 s (taking the average of 200 ms and 2 s);

[0057] The abnormal alarm time for the operation instruction is 200 ms (1.1 s plus 200 ms does not exceed the maximum tolerable time of 2 s for the closing and opening coils).

[0058] The control circuit structures of the breaker opening operation and closing operation are similar. Here, the opening operation is used for illustration.

[0059] The relay protection device enables the protection function of the breaker closing and opening coils through the configuration function pressure plate. After this protection function is enabled, the relay protection device realizes the protection work process for closing and opening as follows:

[0060] Normal non-action state of the circuit: At this time, the breaker is in the closed position (it can trip), and the DL1 position switch is in the closed state; since TJ is open, the TQ coil is not energized, and this state can be maintained continuously when there are no other situations;

[0061] Trip initiation: When the relay protection device detects an abnormality, it makes TJ closed, that is, issues a trip signal;

[0062] The TJ contact closes briefly (about 100 ms) according to the configured duration of the relay protection device. The starting moment is counted as the 0 moment, and the time sequence reference is Figure 3 ;

[0063] Since the normally closed contact of J2a and the contact of DL1 are both closed, ignoring the action delay of the relay contact, the coil of TBJ, the coil of J1 and the trip coil TQ are also energized simultaneously at time 0;

[0064] The energization of the TBJ coil causes its contact TBJa to close, and the control circuit of TQ can also be self - held after the contact TJ is separated;

[0065] After the trip coil TQ is energized, the breaker tripping mechanism operates to attempt to disconnect the primary line of the power system to achieve the protection function;

[0066] The energization of the J1 coil causes its contact J1a to close. The relay protection device determines whether the trip signal TJ is correctly sent and whether the trip coil circuit is normally connected by detecting whether the contact J1a changes its position. This closed - loop detection is only available when the relay protection device enables the protection function for the breaker closing and tripping coils. This is the first new warning state;

[0067] The DL1 position switch is normally open: When the breaker tripping mechanism operates normally, the originally closed DL1 position switch turns to the open state at 200 ms and completes the arc extinguishing operation;

[0068] The disconnection of DL1 causes the coils of TBJ, J1 and the trip coil TQ to lose power simultaneously at 200 ms;

[0069] The loss of power of the TBJ coil causes its contact TBJa to separate, and the control circuit of the trip coil TQ is no longer self - held;

[0070] The loss of power of the J1 coil causes its contact J1a to separate. The relay protection device detects this position change information, confirms that the closing and tripping operations are completed normally, and there is no need for additional operations of the breaker closing and tripping coil protection in the follow - up. That is, the breaker closing and tripping coil protection only exists as a backup form;

[0071] The DL1 position switch cannot be normally disconnected: After TJ operates, due to an abnormality, the breaker opening mechanism operates abnormally. After 200 ms, the DL1 position switch is still in the closed state and remains so. Refer to Figure 3 the orange part; The coils of TBJ, J1 and the trip coil TQ are powered on continuously at 200 ms due to the closure and maintenance of TBJa and DL1. The relay protection device enters the starting state of the breaker closing and tripping coil protection by monitoring that the contact J1a has not separated continuously. This is the second new warning state;

[0072] The trip coil protection operates: At 1.1 s, the relay protection device detects that the contact J1a has not separated and makes the contact CKJ1 close;

[0073] The closing of the CKJ1 contact powers on the J2 relay;

[0074] When J2 is powered on, its normally closed contact J2a is separated, and at the same time, it undertakes the arc extinguishing function of the opening circuit;

[0075] The separation of the normally closed contact J2a causes the TBJ coil, J1 coil, and trip coil TQ to lose power at 1.1 s, avoiding TQ being energized for more than 2 s;

[0076] The loss of power of the TBJ coil causes its TBJa contact to separate, and the TQ operating circuit is no longer self - held;

[0077] The relay protection device sends out the protection action information of the breaker closing and opening coils to inform the user that a fault has occurred.

[0078] Confirmation of the protection action of the trip coil: After the relay protection device closes the CKJ1 contact, it continuously monitors the state of the J1a contact. If it does not separate within the subsequent 200 ms, it sends out the information that the protection action of the breaker closing and opening coils fails. This is the newly added third warning state. Refer to Figure 3 The red part means that both disconnection operations of the coil control circuit have failed, prompting the user to solve the problem.

[0079] In summary, the breaker closing and opening coil protection method cooperating with the relay protection device provided in this embodiment includes the parameter configuration and action logic of the relay protection device, two current relays, two contactors, and correct wiring. The normally closed contacts of the current relays and contactors are connected in series to the original closing and opening control circuits. The current relays are used to judge the working current of the closing and opening circuits, and the normally closed contacts of the contactors disconnect the closing and opening control circuits when needed. After the relay protection device issues the closing and opening action instructions, combined with the configuration parameters and the contact state feedback of the current relays, it real - time judges the working state of the breaker closing and opening coil circuits. When the relay protection device with the breaker closing and opening coil protection function adopts this method, it can provide three newly added warning states for the user, can increase the closed - loop monitoring of the closing and opening output signals, and can drive the contactor to act to disconnect the closing and opening coil control circuits when it is confirmed that the closing and opening operations are abnormal, avoiding the risk of the breaker closing and opening coils being powered on for a long time.

[0080] Those of ordinary skill in the art can realize that the modules and algorithm steps described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0081] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the devices and equipment described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0082] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or modules can be in electrical, mechanical or other forms.

[0083] The modules described as separate components may or may not be physically separated. The components shown as modules may or may not be physical modules, that is, they may be located in one place, or may be distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present invention.

[0084] In addition, in the embodiments of the present invention, the various functional modules can be integrated in a processing module, or each module can exist physically alone, or two or more modules can be integrated in one module.

[0085] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method for sending / receiving energy-saving signals in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs that can store program codes.

[0086] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

[0087] It should be understood that the magnitudes of the sequence numbers of the steps in the content and implementation manners of the present invention do not absolutely mean the sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Claims

1. A circuit breaker opening and closing coil protection method in cooperation with a relay protection device, characterized in that: include: Connect the current relay in series in the circuit breaker opening and closing coil control circuit, and cooperate with the relay protection device to realize the judgment of the circuit breaker opening and closing coil working current; The normally closed contacts of the contactor are connected in series in the circuit breaker opening and closing coil control circuit. The relay protection device determines the working state of the circuit breaker opening and closing coil control circuit based on the current relay. When it is determined that the working state of the circuit breaker opening and closing coil control circuit is abnormal and protection action is required, the circuit breaker opening and closing coil circuit is disconnected by controlling the contactor.

2. The circuit breaker opening and closing coil protection method in cooperation with the relay protection device according to claim 1 is characterized in that: The current relay is used in conjunction with the relay protection device to determine the working current of the circuit breaker opening and closing coil: The relay protection device sends out opening and closing instructions to control the operation of the circuit breaker opening and closing coil control circuit. The current relay operates when the circuit breaker opening and closing coil control circuit is normally connected and maintained abnormally, and the operation information is transmitted to the relay protection device through the current relay contact closure.

3. The circuit breaker opening and closing coil protection method in cooperation with the relay protection device according to claim 2 is characterized in that: When the relay protection device issues an opening and closing command to control the operation of the circuit breaker opening and closing coil control circuit, it determines the working state of the circuit breaker opening and closing coil control circuit according to the time parameters of the circuit breaker opening and closing coil protection action configured by it and the current relay contact feedback information, and then executes the protection action according to the determination result.

4. The circuit breaker opening and closing coil protection method in cooperation with the relay protection device according to claim 3 is characterized in that: The relay protection device determines the working state of the circuit breaker opening and closing coil control circuit according to the time parameter of the circuit breaker opening and closing coil protection action configured by it and the current relay contact feedback information, and then performs the protection action according to the determination result, including: Within the set time limit after the relay protection device issues the opening and closing action command, the relay protection device receives the current relay contact closure signal, which is regarded as correct action feedback; otherwise, the relay protection device outputs an alarm message of abnormal opening and closing action to the user; Under normal circumstances, the current relay loses power due to the completion of the circuit breaker opening and closing operations, and the relay protection device receives the current relay contact separation signal. At this time, it is determined that the circuit breaker opening and closing coil control circuit is normal, and the relay protection device does not need to perform additional operations; Under abnormal circumstances, the current relay continues to be energized due to the failure of the opening and closing operation. The relay protection device finds that the current relay contacts have not changed position when the set time limit is exceeded. It is determined that the circuit breaker opening and closing coil control circuit is abnormal, and the relay protection device executes the circuit breaker opening and closing coil protection action.

5. The circuit breaker opening and closing coil protection method in cooperation with the relay protection device according to claim 4 is characterized in that: The relay protection device performs the circuit breaker opening and closing coil protection action, including: The internal relay is driven to operate, and the operation of the relay drives the contactor to operate. The operation of the contactor causes the normally closed contacts connected in series in the circuit breaker opening and closing control circuit to separate. The separation of the normally closed contacts causes the circuit breaker opening and closing coil to lose power, thereby achieving the short-term power-on requirement of the circuit breaker opening and closing coil, and realizing the protection function of the circuit breaker opening and closing coil; Output the alarm information of the circuit breaker opening and closing coil protection action to the user, and avoid the circuit breaker opening and closing action signal from appearing again.

6. The circuit breaker opening and closing coil protection method in cooperation with the relay protection device according to any one of claims 1 to 5, characterized in that: Also includes: After the relay protection device executes the circuit breaker opening and closing coil protection action, it continues to monitor the current relay contact change information. When the set time limit is exceeded and the current relay contact has not changed, an alarm signal of circuit breaker opening and closing coil protection failure is output to the user.

7. A circuit breaker opening and closing coil protection system that cooperates with the relay protection device is characterized in that: include: The working current judgment module connects the current relay in series in the circuit breaker opening and closing coil control circuit, and cooperates with the relay protection device to realize the judgment of the working current of the circuit breaker opening and closing coil; The protection action judgment execution module connects the normally closed contact of the contactor in series in the circuit breaker opening and closing coil control circuit. The relay protection device determines the working state of the circuit breaker opening and closing coil control circuit based on the current relay. When it is determined that the working state of the circuit breaker opening and closing coil control circuit is abnormal and protection action is required, the circuit breaker opening and closing coil circuit is disconnected by controlling the contactor.

8. An electronic device, characterized in that The invention comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, the circuit breaker opening and closing coil protection method cooperating with the action of a relay protection device as described in any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the circuit breaker opening and closing coil protection method in cooperation with the action of the relay protection device as described in any one of claims 1 to 6 is implemented.

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