Simulation circuit breaker

Abstract

The invention discloses a simulation circuit breaker which is composed of an operation panel, a control loop unit and a signal indication and output unit. The operation panel is provided with a plurality of buttons and indicating lamps and is used for control and state display. The control loop unit comprises a 1DL control loop, a 2DL control loop and a 3DL control loop, and the loops are matched with one another through relays to achieve control logic. An indicator light loop of the signal indication and output unit displays the state of a circuit breaker according to the state of a relay, and a signal output loop outputs a closing position signal, a jumping position signal and a post-closing position signal. Therefore, according to the simulation circuit breaker, the closed position, manual tripping and protection tripping loops are expanded, the action logic requirement of the spare power automatic switching device is met, the test precision and reliability of the spare power automatic switching device are improved, the spare power automatic switching device which is accurately tested can act quickly and correctly when a power system breaks down, the power supply reliability is improved, and meanwhile the reliability of the spare power automatic switching device is improved. And frequent opening and closing abrasion of the real circuit breaker can be avoided, the service life is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of power system test equipment, and particularly to an analog circuit breaker. Background Art

[0002] During the stable operation of the power system, the integrated tests of relay protection devices and complete sets of relay protection panels are important links to ensure the safe and reliable operation of the power system. In these tests, the analog circuit breaker plays an indispensable role. It is mainly used to simulate the opening and closing times of high-voltage circuit breakers, and replaces the real high-voltage circuit breaker for tripping and closing operations during the integrated test, effectively avoiding repeated opening and closing of the real circuit breaker due to repeated integrated tests, thereby reducing the loss of the circuit breaker and extending its service life.

[0003] With the continuous development and upgrading of the power system, the problem of different service lives of primary and secondary equipment in substations has gradually emerged. Due to the needs of technology updates, function expansions, etc., the frequency of transformation of secondary equipment is increasing day by day. During the secondary transformation process, minimizing the power outage time is crucial for ensuring the stability and reliability of power supply.

[0004] However, the existing analog circuit breakers have some obvious defects in practical applications. Although the currently common analog circuit breakers can simulate the open position and closed position of the switch, they cannot simulate the important state of the post-closed position in the key link of the modification of the automatic bus transfer device. This defect makes it difficult to meet the logical requirements for the operation of the automatic bus transfer device, resulting in the inability to comprehensively and accurately simulate the actual operation situation when testing and calibrating the automatic bus transfer device, and thus affecting the safe and stable operation of the power system. For example, in some complex power networks, if the automatic bus transfer device cannot make action logic judgments based on the accurate state of the analog circuit breaker, it may lead to the failure of the standby power supply to be put into operation in time when the main power supply fails, causing large-scale power outages and bringing serious impacts to social production and life. Therefore, it is of great practical significance to develop an analog circuit breaker that can effectively simulate the post-closed position and meet the logical requirements for the operation of the automatic bus transfer device. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems in the related technologies to some extent.

[0006] To this end, the first object of this application is to provide an analog circuit breaker. This analog circuit breaker successfully expands the post-closed position, clearly distinguishes the manual tripping circuit and the protection tripping circuit, can fully meet the logical requirements for the operation of the automatic bus transfer device, provides an accurate and reliable simulation environment for the test and calibration of the automatic bus transfer device, and greatly improves the test accuracy and reliability of the automatic bus transfer device.

[0007] The second object of the present application is to provide a simulated circuit breaker, which can accurately test the automatic bus transfer device, ensure that when a fault occurs in the power system, the automatic bus transfer device can act quickly and correctly, close the standby power supply in time, reduce the power outage time, effectively improve the power supply reliability of the power system, and ensure the safe and stable operation of the power system.

[0008] The third object of the present application is to provide a simulated circuit breaker. In the integrated test of the relay protection device and the complete set of relay protection panels, using this simulated circuit breaker can avoid the wear and faults caused by the frequent opening and closing of the real circuit breaker, extend the service life of the real circuit breaker, and reduce the equipment maintenance cost.

[0009] To achieve the above object, an embodiment of the first aspect of the present application provides a simulated circuit breaker, including an operation panel, a control loop unit, and a signal indication and output unit. Among them, a power switch, a manual closing button SB1, a protection tripping button SB2, a manual closing button SB3, a protection tripping button SB4, a manual closing button SB5, a protection tripping button SB6, and indicator lights LD1, HD1, LD2, HD2, LD3 are provided on the operation panel. Among them, the power switch is used to control the power on and off of the simulated circuit breaker, the manual closing button is used to issue a manual closing operation instruction, the protection tripping button is used to issue a protection tripping operation instruction, and the indicator light is used to display the circuit breaker status; the control loop unit includes a plurality of control loops, namely 1DL control loop, 2DL control loop, and 3DL control loop. Among them, in the 1DL control loop, a closing coil relay KA1, a tripping coil relay KA2, a protection tripping relay KA3, and a closing-after relay KA4 are provided. Among them, the manual closing button SB1 is connected in series with the closing coil relay KA1, the protection tripping button SB2 is connected in series with the protection tripping relay KA3, and the normally closed contact of the tripping coil relay KA2 cooperates with the normally open contacts of the closing coil relay KA1, the protection tripping relay KA3, and the closing-after relay KA4 to form a control logic; in the 2DL control loop, a closing coil relay KA5, a tripping coil relay KA6, a protection tripping relay KA7, and a closing-after relay KA8 are provided. Among them, the manual closing button SB3 is connected in series with the closing coil relay KA5, the protection tripping button SB4 is connected in series with the protection tripping relay KA7, and the normally closed contact of the tripping coil relay KA6 cooperates with the normally open contacts of the closing coil relay KA5, the protection tripping relay KA7, and the closing-after relay KA8 to form a control logic; in the 3DL control loop, a closing coil relay KA9, a tripping coil relay KA10, a protection tripping relay KA11, and a closing-after relay KA12 are provided. Among them, the manual closing button SB5 is connected in series with the closing coil relay KA9, the protection tripping button SB6 is connected in series with the protection tripping relay KA11, and the normally closed contact of the tripping coil relay KA10 cooperates with the normally open contacts of the closing coil relay KA9, the protection tripping relay KA11, and the closing-after relay KA12 to form a control logic; the signal indication and output unit includes an indicator light loop and a signal output loop. Among them, in the indicator light loop, the normally open contact of the closing coil relay KA1 controls the indicator lights HD1 and LD1, the normally open contact of the closing coil relay KA5 controls the indicator lights HD2 and LD2, and the normally open contact of the closing coil relay KA9 controls the indicator lights HD3 and LD3;In the signal output circuit, the normally open contact of the closing coil relay KA1 outputs the closed position signal of 1DL, its normally closed contact outputs the tripped position signal of 1DL, the normally open contact of the post-closing relay KA4 outputs the post-closed position signal of 1DL, the normally open contact of the closing coil relay KA5 outputs the closed position signal of 2DL, its normally closed contact outputs the tripped position signal of 2DL, the normally open contact of the post-closing relay KA8 outputs the post-closed position signal of 2DL, the normally open contact of the closing coil relay KA9 outputs the closed position signal of 3DL, its normally closed contact outputs the tripped position signal of 3DL, and the normally open contact of the post-closing relay KA12 outputs the post-closed position signal of 3DL.;

[0010] An analog circuit breaker according to an embodiment of the present application. This analog circuit breaker expands the post-closed position, differentiates the manual tripping and protection tripping circuits, meets the action logic requirements of the backup power supply automatic switching device, improves its test accuracy and reliability. The accurately tested backup power supply automatic switching device can operate quickly and correctly during power system faults, enhancing power supply reliability. At the same time, it can also avoid frequent opening and closing wear of the real circuit breaker, extend its life, and reduce maintenance costs.

[0011] In addition, an analog circuit breaker according to the above-mentioned present application may also have the following additional technical features:

[0012] In an embodiment of the present application, the operation panel is located on the front surface of the analog circuit breaker, facilitating manual operation and status viewing by the operator. The control circuit unit is arranged inside the analog circuit breaker and is connected to the buttons, indicators, and signal output circuit on the operation panel through wires. Some components of the signal indication and output unit are integrated with the control circuit unit, and the indicator lights are partially arranged on the operation panel.

[0013] In an embodiment of the present application, the relays in each control circuit are electromagnetic relays, and the closing and opening of the contacts are realized through the principle of electromagnetic induction, thereby controlling the on-off of the circuit and the transmission of signals.

[0014] In an embodiment of the present application, the indicator lights LD1, HD1, LD2, HD2, LD3 are light-emitting diodes, which have the characteristics of low power consumption, long life, and fast response speed, and are used to intuitively display the closed and tripped positions of the circuit breaker.

[0015] In an embodiment of the present application, the closed position, tripped position, and post-closed position signals output by the signal output circuit are passive dry contact signals, which can be conveniently connected and communicated with external relay protection devices and backup power supply automatic switching devices.

[0016] The power switch uses a Schneider NSX100N 3P switch.

[0017] The manual closing button and the protection tripping button adopt Siemens 3SE3 series self - reset push - button switches, such as 3SE3220 - 0AA00 (normally open contact type, meeting the button operation requirements in electrical control).

[0018] The indicator lights LD1, HD1, LD2, HD2, LD3 adopt OSRAM L - 732F green (for LD series, indicating the tripping state) and red (for HD series, indicating the closing state) light - emitting diodes, with a voltage specification of DC24V (adapting to the common power system control voltage, high brightness, long life).

[0019] The closing coil relays KA1, KA5, KA9 adopt Omron G6B series relays, such as G6B - 1174P - US (coil voltage DC24V, contact capacity meeting the circuit control requirements, high reliability).

[0020] The tripping coil relays KA2, KA6, KA10 adopt Panasonic A5 series relays, such as A5C - RY - 1 (DC24V coil, capable of quickly responding to the tripping action signal).

[0021] The protection tripping relays KA3, KA7, KA11 adopt Hongfa HF115F series relays, such as HF115F - 005 - 1ZS (with high sensitivity, capable of quickly responding to the protection tripping signal).

[0022] The post - closing relays KA4, KA8, KA12 adopt 1217 series relays of TE Connectivity, such as 1217 - 012 - 01 (DC24V, capable of stably holding the post - closing position signal).

[0023] The advantages of this application compared with the existing technology are as follows:

[0024] (1) This simulated circuit breaker successfully expands the post - closing position, clearly distinguishes the manual tripping circuit and the protection tripping circuit, can fully meet the logical requirements of the standby power - supply automatic - switching device, provides an accurate and reliable simulation environment for the test and calibration of the standby power - supply automatic - switching device, and greatly improves the test accuracy and reliability of the standby power - supply automatic - switching device.

[0025] (2) By accurately testing the standby power - supply automatic - switching device, it is ensured that when a fault occurs in the power system, the standby power - supply automatic - switching device can act quickly and correctly, close the standby power supply in time, reduce the power outage time, effectively improve the power supply reliability of the power system, and ensure the safe and stable operation of the power system.

[0026] (3) In the integrated test of the relay protection device and the complete relay protection panel, using this simulated circuit breaker can avoid the wear and faults of the real circuit breaker caused by frequent opening and closing, extend the service life of the real circuit breaker, and reduce the equipment maintenance cost.

[0027] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be learned through the practice of the present application. Description of the Drawings

[0028] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0029] Figure 1 Schematic diagram of the 1DL control loop of a simulated circuit breaker according to an embodiment of the present application;

[0030] Figure 2 Schematic diagram of the 2DL control loop of a simulated circuit breaker according to an embodiment of the present application;

[0031] Figure 3 Schematic diagram of the control loop of a simulated circuit breaker according to an embodiment of the present application;

[0032] Figure 4 Schematic diagram of the signal lamp of a simulated circuit breaker according to an embodiment of the present application;

[0033] Figure 5 Schematic diagram of the signal output circuit of a simulated circuit breaker according to an embodiment of the present application;

[0034] Figure 6 Drilling drawing of a simulated circuit breaker according to an embodiment of the present application.

[0035] As shown in the figure: Operating panel 1: Power switch 11; Manual closing button SB1; Protection trip button SB2; Manual closing button SB3; Protection trip button SB4; Manual closing button SB5; Protection trip button SB6; Indicator lamp LD1; Indicator lamp HD1; Indicator lamp LD2; Indicator lamp HD2; Indicator lamp LD3.

[0036] Control loop unit 2: 1DL control loop; 2DL control loop; 3DL control loop; Closing coil relay KA1; Tripping coil relay KA2; Protection trip relay KA3; After-closing relay KA4; Closing coil relay KA5; Tripping coil relay KA6; Protection trip relay KA7; After-closing relay KA8; Closing coil relay KA9; Tripping coil relay KA10; Protection trip relay KA11; After-closing relay KA12.

[0037] Signal indication and output unit 3: Indicator lamp HD3; Closing coil relay KA1; Closing coil relay KA5; Closing coil relay KA9; After-closing relay KA4; After-closing relay KA8; After-closing relay KA12. Detailed implementation manners

[0038] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. On the contrary, the embodiments of the present application include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0039] A simulated circuit breaker according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0040] As Figures 1 - 6 shown, a simulated circuit breaker according to an embodiment of the present application may include an operation panel 1, a control loop unit 2, and a signal indication and output unit 3.

[0041] In an actual application scenario, the working process of this simulated circuit breaker is as follows:

[0042] Operation process of the operation panel 1: The operation panel 1 is the first thing that the operator contacts. When it is necessary to start the simulated circuit breaker, the power switch 11 is closed to supply power to the entire simulated circuit breaker system, enabling it to enter an operable state.

[0043] Manual closing operation: If a manual closing operation is to be performed, the operator presses the manual closing button. For example, when the manual closing button SB1 is pressed, current flows through the manual closing button SB1 into the closing coil relay KA1, triggering a closing instruction. Similarly, when the manual closing button SB3 or SB5 is pressed, closing instructions will be sent to the closing coil relays KA5 and KA9 respectively.

[0044] Protection tripping operation: When the system detects an abnormal situation and needs to perform a protection trip, the protection trip button will be triggered. For example, when the protection trip button SB2 is pressed, current flows through the protection trip button SB2 into the protection trip relay KA3, triggering a protection trip instruction. Similarly, when the protection trip buttons SB4 and SB6 are pressed, protection trip instructions will be sent to the protection trip relays KA7 and KA11 respectively.

[0045] Status indication viewing: The indicator lights LD1, HD1, LD2, HD2, LD3 are used to display the circuit breaker status in real time. When the closing coil relay KA1 is energized, its normally open contacts close, and the indicator light HD1 lights up and LD1 goes out, indicating that the 1DL simulated circuit breaker is in the closed state; conversely, when the closing coil relay KA1 loses power, its normally open contacts open, HD1 goes out and LD1 lights up, indicating that the 1DL simulated circuit breaker is in the tripped state. HD2 and LD2, HD3 and LD3 display the status of the 2DL and 3DL simulated circuit breakers respectively in the same principle.

[0046] Working process of the control loop unit 2: The control loop unit 2 includes the 1DL control loop, 2DL control loop, and 3DL control loop. Their working principles are similar. Taking the 1DL control loop as an example:

[0047] Working process of the 1DL control loop: In the 1DL control loop, when the manual closing button SB1 is pressed, the closing coil relay KA1 is energized, and its normally open contacts close. On the one hand, it provides a path for the closing operation, enabling the simulated circuit breaker to perform the closing operation; on the other hand, the signal of the closed normally open contacts is used for subsequent control. At this time, the normally closed contacts of the tripping coil relay KA2 remain closed to ensure the smooth progress of the closing operation. After the closing is completed, the post-closing relay KA4 is energized, and its normally open contacts close, indicating that the simulated circuit breaker is in the post-closing position.

[0048] When the protection tripping button SB2 is pressed, the protection tripping relay KA3 is energized, and its normally open contacts close, triggering the tripping action. At the same time, the normally closed contacts of the tripping coil relay KA2 open, cutting off the power supply circuit of the closing coil relay KA1, causing the simulated circuit breaker to trip, and the post-closing relay KA4 loses power, and the normally open contacts open, canceling the post-closing position indication.

[0049] Working process of the 2DL and 3DL control loops: In the 2DL control loop, the manual closing button SB3 is in series with the closing coil relay KA5, and the protection tripping button SB4 is in series with the protection tripping relay KA7. When SB3 is pressed, KA5 is energized for closing; when SB4 is pressed, KA7 is energized to trip the simulated circuit breaker. The cooperation logic of each relay is the same as that of the 1DL control loop. Similarly, in the 3DL control loop, the manual closing button SB5 is in series with the closing coil relay KA9, and the protection tripping button SB6 is in series with the protection tripping relay KA11, realizing the corresponding closing, tripping, and post-closing position indication functions.

[0050] Working process of the signal indication and output unit 3: The signal indication and output unit 3 includes an indicator light loop and a signal output loop.

[0051] Working process of the indicator light loop: In the indicator light loop, the normally open contacts of the closing coil relay KA1 control the indicator lights HD1 and LD1. When KA1 is energized, the normally open contacts close, HD1 lights up, and LD1 goes out, indicating that the 1DL simulated circuit breaker is closed; when KA1 loses power, the normally open contacts open, HD1 goes out, and LD1 lights up, indicating tripping. The closing coil relays KA5 and KA9 control the indicator lights HD2 and LD2, HD3 and LD3 in the same way respectively, indicating the states of the 2DL and 3DL simulated circuit breakers.

[0052] Signal output circuit working process: The signal output circuit is used to output the status signal of the analog circuit breaker to external devices. When the 1DL analog circuit breaker is closed, the normally open contact of the closing coil relay KA1 closes, and the 1DL closed position signal is output; when tripping, the normally closed contact closes, and the 1DL tripped position signal is output. When the normally open contact of the post-closing relay KA4 closes, the 1DL post-closing position signal is output. The principle of the status signal output of the 2DL and 3DL analog circuit breakers is the same as that of the 1DL. The closing coil relays KA5, KA9 and the post-closing relays KA8, KA12 respectively output the closed position, tripped position and post-closing position signals of the 2DL and 3DL. These signals are passive dry contact signals, which are convenient for connecting and communicating with external relay protection devices and automatic standby power supply devices.

[0053] In an embodiment of the present application, as Figures 1 - 6 shown, the operation panel 1 is located on the front surface of the analog circuit breaker, which is convenient for the operator to perform manual operations and view the status. The control circuit unit 2 is arranged inside the analog circuit breaker and is connected to the buttons, indicator lights and signal output circuit on the operation panel 1 through wires. Some components of the signal indication and output unit 3 are integrally arranged with the control circuit unit 2, and the indicator light part is arranged on the operation panel 1.

[0054] It can be understood that the operation panel 1 is arranged on the front surface of the analog circuit breaker, which greatly facilitates the operator to perform manual operations and view the status. The operator can easily touch the power switch 11 on the operation panel 1 and control the power on and off of the analog circuit breaker through a simple opening and closing action. Similarly, the manual closing buttons SB1, SB3, SB5 and the protection tripping buttons SB2, SB4, SB6 are also located at prominent positions on the operation panel 1. When the operator needs to perform manual closing or protection tripping operations, he can quickly find and press the corresponding buttons. Moreover, the indicator lights LD1, HD1, LD2, HD2, LD3 are also intuitively displayed on the operation panel 1. The operator can observe the closed position and tripped position status of the analog circuit breaker in real time. For example, when HD1 is on and LD1 is off, it means that the 1DL analog circuit breaker is in the closed state; when HD1 is off and LD1 is on, it means that the 1DL analog circuit breaker is in the tripped state.

[0055] The control loop unit 2 is arranged inside the analog circuit breaker. This arrangement not only ensures the safety and stability of the internal circuit but also enables effective connection with external operating components and signal output components. The control loop unit 2 is closely connected to the buttons on the operation panel 1 through wires. For example, when the operator presses the manual closing button SB1 on the operation panel 1, an electrical signal is quickly transmitted through the wire to the 1DL control loop in the control loop unit 2, causing the closing coil relay KA1 connected in series with the manual closing button SB1 to be energized, thereby triggering the closing operation of the 1DL analog circuit breaker. Similarly, when the protection tripping button SB2 is pressed, the electrical signal is also transmitted through the wire to the protection tripping relay KA3 in the 1DL control loop, triggering the tripping action.

[0056] The control loop unit 2 is also connected to the indicator lights on the operation panel 1 through wires. Taking the 1DL control loop as an example, after the closing coil relay KA1 is energized and operates, the state change of its normally open contacts is fed back through the wire to the indicator lights HD1 and LD1 on the operation panel 1, controlling their on / off states, thereby accurately showing the state of the 1DL analog circuit breaker to the operator.

[0057] In addition, the control loop unit 2 is also connected to the signal output circuit through wires. In the 1DL control loop, the normally open contacts and normally closed contacts of the closing coil relay KA1 respectively output the 1DL closed position signal and the 1DL tripped position signal. These signals are transmitted through the wire to the signal output circuit, and then the signal output circuit outputs the signals to external devices such as relay protection devices and automatic standby power supply devices, enabling the external devices to obtain the state information of the analog circuit breaker in real time.

[0058] Some components of the signal indication and output unit 3 are integrally arranged with the control loop unit 2. In the indicator light loop, closing coil relays KA1, KA5, KA9, etc. are key components for controlling the indicator lights and are closely related to the corresponding control loops in the control loop unit 2. For example, after the closing coil relay KA1 in the 1DL control loop is energized and operates in the control loop unit 2, its normally open contacts control the indicator lights HD1 and LD1 in the indicator light loop of the signal indication and output unit 3, determining their on / off states.

[0059] The indicator light part is arranged on the operation panel 1. This arrangement combines signal indication with the operation interface, enabling the operator to intuitively obtain the state information of the analog circuit breaker while performing operations. Without additional equipment or operations, the operator can clearly understand the closed and tripped states of the 1DL, 2DL, and 3DL analog circuit breakers from the indicator lights on the operation panel 1, greatly improving the convenience of operation and the real-time monitoring of the equipment state.

[0060] In an embodiment of the present application, as Figures 1 - 6As shown, the relays in each control loop are electromagnetic relays. The closing and opening of the contacts are achieved through the principle of electromagnetic induction, thereby controlling the on-off of the circuit and the transmission of signals.

[0061] It can be understood that the relays in each control loop (1DL control loop, 2DL control loop, and 3DL control loop), including closing coil relays (KA1, KA5, KA9), tripping coil relays (KA2, KA6, KA10), protection tripping relays (KA3, KA7, KA11), and post-closing relays (KA4, KA8, KA12), all adopt electromagnetic relays.

[0062] Taking the 1DL control loop as an example, when the operator presses the manual closing button SB1 on the operation panel 1, the current flows through the circuit in series with the manual closing button SB1 and the closing coil relay KA1. There is a coil inside the electromagnetic closing coil relay KA1. When the current passes through the coil, a magnetic field will be generated. According to the principle of electromagnetic induction, this magnetic field will cause the armature inside the relay to act. When the magnetic force is large enough, the armature drives the contacts to act, making the normally open contacts closed and the circuit conducting. At this time, the closing current can pass through the closed contacts of the closing coil relay KA1, triggering the closing operation of the 1DL analog circuit breaker.

[0063] In the protection tripping scenario, when the protection tripping button SB2 is pressed, the current flows into the coil of the protection tripping relay KA3. Similarly based on electromagnetic induction, the coil generates a magnetic field to make the armature act, causing the normally open contacts of the protection tripping relay KA3 to close. This closing action triggers the tripping circuit, and the normally closed contacts of the tripping coil relay KA2 open, cutting off the power supply circuit of the closing coil relay KA1, causing the 1DL analog circuit breaker to trip.

[0064] After the 1DL analog circuit breaker is closed, the coil of the post-closing relay KA4 is energized. Electromagnetic induction comes into play again, making the normally open contacts of the post-closing relay KA4 closed, thereby indicating that the analog circuit breaker is in the post-closing position.

[0065] The working principles of the 2DL control loop and the 3DL control loop are similar to that of the 1DL control loop. In the 2DL control loop, when the manual closing button SB3 is pressed, the coil of the closing coil relay KA5 is energized, and electromagnetic induction prompts its contacts to act to achieve closing; when the protection tripping button SB4 is pressed, the coil of the protection tripping relay KA7 is energized, and the contacts act to trigger tripping. The post-closing relay KA8 indicates the post-closing position after closing. In the 3DL control loop, the manual closing button SB5 corresponds to the closing coil relay KA9, the protection tripping button SB6 corresponds to the protection tripping relay KA11, and the post-closing relay KA12 is used to indicate the post-closing position. They all rely on the principle of electromagnetic induction to control the on-off of the circuit and the transmission of signals, ensuring the normal operation of the 2DL and 3DL analog circuit breakers.

[0066] In an embodiment of the present application, as Figures 1 - 6 shown, the indicating lamps LD1, HD1, LD2, HD2, and LD3 are light-emitting diodes, which have the characteristics of low power consumption, long service life, and fast response speed, and are used to intuitively display the closed position and tripped position states of the circuit breaker.

[0067] It can be understood that taking the state indication of 1DL simulating the circuit breaker as an example, when the closing coil relay KA1 in the 1DL control loop in the control loop unit 2 is energized and operates, its normally open contact closes. The electrical signal generated by this closing action is quickly transmitted through the wire to the circuits where the indicating lamps HD1 and LD1 are located on the operation panel 1. Since HD1 and LD1 are light-emitting diodes, their internal structures determine their operating characteristics when receiving appropriate electrical signals. When the circuit corresponding to HD1 is turned on, the HD1 light-emitting diode lights up, intuitively showing the operator that the 1DL simulating circuit breaker is in the closed state; at the same time, the circuit where the LD1 light-emitting diode is located is in an open state due to the closing of the normally open contact of the closing coil relay KA1, and LD1 goes out. Due to the fast response speed of the light-emitting diode, the change from receiving the electrical signal to the state display is almost instantaneous, and the operator can obtain the closing state information of the 1DL simulating circuit breaker in a timely manner.

[0068] When the 1DL simulating circuit breaker is in the tripped state, the closing coil relay KA1 in the 1DL control loop loses power, its normally open contact opens, and its normally closed contact closes. This change causes the circuit where the HD1 light-emitting diode is located to be open, and HD1 goes out; while the circuit where the LD1 light-emitting diode is located is turned on, and LD1 lights up, clearly indicating that the 1DL simulating circuit breaker has tripped.

[0069] For the 2DL simulating circuit breaker, when the closing coil relay KA5 in the 2DL control loop is energized, its normally open contact control signal is transmitted to the indicating lamps HD2 and LD2 on the operation panel 1. The HD2 light-emitting diode lights up, and LD2 goes out, indicating that the 2DL simulating circuit breaker is closed. Conversely, when KA5 loses power, HD2 goes out and LD2 lights up, indicating that the 2DL simulating circuit breaker has tripped. Similarly, the state of the 3DL simulating circuit breaker is displayed by the HD3 and LD3 light-emitting diodes on the operation panel 1. When the closing coil relay KA9 is energized, HD3 is on and LD3 is off, indicating closing; when KA9 loses power, HD3 is off and LD3 is on, indicating tripping.

[0070] In an embodiment of the present application, as Figures 1 - 6 shown, the closed position, tripped position, and post-closing position signals output by the signal output circuit are passive dry contact signals, which can be conveniently connected and communicated with external relay protection devices and automatic standby power supply devices.

[0071] It is understandable that taking the 1DL analog circuit breaker as an example, in the 1DL control circuit of the control circuit unit 2, the closing coil relay KA1 plays an important role. When the analog circuit breaker performs a closing operation, the closing coil relay KA1 is energized, and its normally open contacts close. At this time, the 1DL closing position signal output from the normally open contacts of the closing coil relay KA1 is output in the form of a passive dry contact signal. The so-called passive dry contact signal means that the signal itself does not carry a power supply, but only the change in the closed or open state of a pair of contacts. When actually connecting, this pair of normally open contacts can be connected to the corresponding signal input terminals of external relay protection devices or automatic bus transfer devices. When the normally open contacts close, the external device can receive the signal that the 1DL analog circuit breaker is in the closing state, and make corresponding logical judgments and operations based on this.

[0072] When the 1DL analog circuit breaker trips, the closing coil relay KA1 loses power, and its normally closed contacts close, outputting the 1DL tripping position signal. This is also a passive dry contact signal. By connecting this normally closed contact to an external device, the external device can thereby know that the 1DL analog circuit breaker is already in the tripping state.

[0073] And the normally open contacts of the post-closing relay KA4 close after the 1DL analog circuit breaker completes closing, outputting the 1DL post-closing position signal, which is also a passive dry contact signal. After receiving this signal, external relay protection devices and automatic bus transfer devices can clearly know that the 1DL analog circuit breaker has completed the closing operation and is in the post-closing state.

[0074] For the 2DL analog circuit breaker, in the 2DL control circuit of the control circuit unit 2, when the closing coil relay KA5 is energized, its normally open contacts output the 2DL closing position signal (passive dry contact signal); when it loses power, its normally closed contacts output the 2DL tripping position signal (passive dry contact signal); when the normally open contacts of the post-closing relay KA8 close, it outputs the 2DL post-closing position signal (passive dry contact signal). These signals are respectively connected to corresponding external devices to realize the transmission of the state information of the 2DL analog circuit breaker.

[0075] Similarly, the closing position, tripping position, and post-closing position signals of the 3DL analog circuit breaker are controlled and output by the closing coil relay KA9, tripping coil relay KA10, and post-closing relay KA12 in the 3DL control circuit of the control circuit unit 2. They are all passive dry contact signals and are connected to external devices, enabling external relay protection devices and automatic bus transfer devices to obtain the state information of the 3DL analog circuit breaker in real time and accurately. Furthermore, it ensures that the entire power system can make precise logical judgments and operations based on the state of the analog circuit breaker in various situations, improving the stability and reliability of the power system operation.

[0076] It should be noted that the control method of this application can be automatically controlled by a controller. The control method of the controller can be implemented by simple programming by those skilled in the art and belongs to the common general knowledge in this field. Moreover, this application is mainly used to protect the mechanical structure, so the control method and circuit connection will not be explained in detail in this application.

[0077] Specifically, when actually using this simulated circuit breaker, assume that technicians in the power system need to test the relay protection device of a certain regional power grid to ensure that the protection function is normal under various fault conditions. The following is the detailed usage process and working flow:

[0078] 1. Equipment preparation and startup: The technician comes to the simulated circuit breaker and first checks the operation panel 1. To start the simulated circuit breaker, the technician closes the power switch 11 on the operation panel 1. At this time, the entire simulated circuit breaker system is powered on and enters the operable state.

[0079] 2. Simulate manual closing operation: The technician plans to simulate the closing operation under normal conditions to test the response of the relay protection device to the closed state. The technician presses the manual closing button SB1 on the operation panel 1, and the current immediately flows through the manual closing button SB1 into the closing coil relay KA1 of the 1DL control circuit in the control circuit unit 2. After the coil of the electromagnetic closing coil relay KA1 is energized, a magnetic field is generated. Under the action of electromagnetic induction, the armature in the relay moves, driving the normally open contact to close. This closing action allows the closing current to pass through, triggering the closing operation of the 1DL simulated circuit breaker. At the same time, the indicator light HD1 on the operation panel 1 lights up and LD1 goes out, intuitively showing the technician that the 1DL simulated circuit breaker is in the closed state.

[0080] 3. Simulate protection tripping operation: Next, the technician simulates a fault in the power system and needs to trigger protection tripping. The technician presses the protection trip button SB2 on the operation panel 1, and the current flows through the protection trip button SB2 into the protection trip relay KA3 in the 1DL control circuit. Similarly, based on the principle of electromagnetic induction, the coil of the protection trip relay KA3 generates a magnetic field, causing its normally open contact to close. This closing action triggers the tripping circuit, causing the normally closed contact of the tripping coil relay KA2 to open, cutting off the power supply circuit of the closing coil relay KA1, and tripping the 1DL simulated circuit breaker. At the same time, the indicator light HD1 on the operation panel 1 goes out and LD1 lights up, indicating that the 1DL simulated circuit breaker has tripped.

[0081] 4. Signal Output and Interaction with External Devices: During the above operation process, the signal indication and output unit 3 keeps working. Taking the closing of the 1DL simulated circuit breaker as an example, when the normally open contact of the closing coil relay KA1 closes, a closing position signal (passive dry contact signal) of 1DL is output. Technicians connect the corresponding signal input terminal of the external relay protection device to the normally open contact of the closing coil relay KA1 in the signal output circuit of the simulated circuit breaker. When the normally open contact closes, the external relay protection device receives the signal that the 1DL simulated circuit breaker is in the closing state, and then conducts corresponding logical judgment and operation. Similarly, when the 1DL simulated circuit breaker trips, the normally closed contact of the closing coil relay KA1 closes, and a tripping position signal (passive dry contact signal) of 1DL is output to the external device to let it know the tripping state of the 1DL simulated circuit breaker. After the closing of the 1DL simulated circuit breaker is completed, the normally open contact of the post-closing relay KA4 closes, and a post-closing position signal (passive dry contact signal) of 1DL is output. The external relay protection device and the automatic standby power supply device receive this signal to clarify that the 1DL simulated circuit breaker has completed the closing operation and is in the post-closing state. For the 2DL and 3DL simulated circuit breakers, if technicians press the manual closing buttons SB3, SB5 or the protection tripping buttons SB4, SB6, their operation process and signal output principle are the same as those of the 1DL simulated circuit breaker. By controlling the corresponding relay actions in the control circuit unit 2, the closing and tripping operations of the simulated circuit breaker are realized, and the closing position, tripping position, and post-closing position signals (passive dry contact signals) of the 2DL and 3DL simulated circuit breakers are output to the external devices to ensure that in various simulated situations of the entire power system, accurate logical judgment and operation are carried out based on the state of the simulated circuit breaker, improving the stability and reliability of the power system operation.

[0082] In summary, for a simulated circuit breaker according to an embodiment of the present application, this simulated circuit breaker expands the post-closing position, distinguishes the manual tripping and protection tripping circuits, meets the action logic requirements of the automatic standby power supply device, improves its test accuracy and reliability. The accurately tested automatic standby power supply device can act quickly and correctly when a power system fault occurs, improving the power supply reliability. At the same time, it can also avoid the frequent opening and closing wear of the real circuit breaker, extend its service life, and reduce the maintenance cost.

[0083] In the description of this specification, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0084] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0085] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A simulated circuit breaker, characterized in that, It includes an operation panel 1, a control loop unit 2, and a signal indication and output unit 3. Among them, on the operation panel 1, there are a power switch 11, a manual closing button SB1, a protection trip button SB2, a manual closing button SB3, a protection trip button SB4, a manual closing button SB5, a protection trip button SB6, and indicator lights LD1, HD1, LD2, HD2, LD3. Among them, the power switch 11 is used to control the power on and off of the analog circuit breaker. The manual closing button is used to send a manual closing operation instruction. The protection trip button is used to send a protection trip operation instruction. The indicator light is used to display the circuit breaker status; the control loop unit 2 includes multiple control loops, namely the 1DL control loop, the 2DL control loop, and the 3DL control loop. Among them, in the 1DL control loop, there are a closing coil relay KA1, a tripping coil relay KA2, a protection trip relay KA3, and a closed after relay KA4. Among them, the manual closing button SB1 is in series with the closing coil relay KA1. The protection trip button SB2 is in series with the protection trip relay KA3. The normally closed contact of the tripping coil relay KA2 cooperates with the normally open contacts of the closing coil relay KA1, the protection trip relay KA3, and the closed after relay KA4 to form a control logic; in the 2DL control loop, there are a closing coil relay KA5, a tripping coil relay KA6, a protection trip relay KA7, and a closed after relay KA8. Among them, the manual closing button SB3 is in series with the closing coil relay KA5. The protection trip button SB4 is in series with the protection trip relay KA7. The normally closed contact of the tripping coil relay KA6 cooperates with the normally open contacts of the closing coil relay KA5, the protection trip relay KA7, and the closed after relay KA8 to form a control logic; in the 3DL control loop, there are a closing coil relay KA9, a tripping coil relay KA10, a protection trip relay KA11, and a closed after relay KA12. Among them, the manual closing button SB5 is in series with the closing coil relay KA9. The protection trip button SB6 is in series with the protection trip relay KA11. The normally closed contact of the tripping coil relay KA10 cooperates with the normally open contacts of the closing coil relay KA9, the protection trip relay KA11, and the closed after relay KA12 to form a control logic; the signal indication and output unit 3 includes an indicator light loop and a signal output loop. Among them, in the indicator light loop, the normally open contact of the closing coil relay KA1 controls the indicator lights HD1 and LD1. The normally open contact of the closing coil relay KA5 controls the indicator lights HD2 and LD2. The normally open contact of the closing coil relay KA9 controls the indicator lights HD3 and LD3; In the signal output circuit, the normally open contact of the closing coil relay KA1 outputs the closed position signal of 1DL, its normally closed contact outputs the tripped position signal of 1DL, the normally open contact of the post-closing relay KA4 outputs the post-closed position signal of 1DL, the normally open contact of the closing coil relay KA5 outputs the closed position signal of 2DL, its normally closed contact outputs the tripped position signal of 2DL, the normally open contact of the post-closing relay KA8 outputs the post-closed position signal of 2DL, the normally open contact of the closing coil relay KA9 outputs the closed position signal of 3DL, its normally closed contact outputs the tripped position signal of 3DL, and the normally open contact of the post-closing relay KA12 outputs the post-closed position signal of 3DL.

2. The analog circuit breaker according to claim 1, wherein The operation panel 1 is located on the front surface of the analog circuit breaker, facilitating manual operation and status viewing by the operator. The control circuit unit 2 is arranged inside the analog circuit breaker and is connected to the buttons, indicators, and signal output circuit on the operation panel 1 through wires. Some components of the signal indication and output unit 3 are integrally arranged with the control circuit unit 2, and the indicator part is arranged on the operation panel 1.

3. The analog circuit breaker according to claim 1, wherein The relays in each control circuit are electromagnetic relays, which achieve the closing and opening of contacts through the principle of electromagnetic induction, thereby controlling the on-off of the circuit and the transmission of signals.

4. The analog circuit breaker according to claim 1, characterized in that, The indicators LD1, HD1, LD2, HD2, and LD3 are light-emitting diodes, which have the characteristics of low power consumption, long lifespan, and fast response speed, and are used to visually display the closed and tripped positions of the circuit breaker.

5. The analog circuit breaker according to claim 1, characterized in that, The closed position, tripped position, and post-closed position signals output by the signal output circuit are passive dry contact signals, which can be conveniently connected and communicated with external relay protection devices and automatic standby power supply devices.

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