Novel monitoring system of breaker locking device
By introducing a current detection module and a back-end management system into the circuit breaker interlocking device, the current signal is monitored in real time and threshold comparisons are performed. This solves the problem of unreliable operation caused by circuit breaker interlocking electromagnet failure, realizes precise control and automated management of circuit breaker status, and improves the stability and safety of the power system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 湖北能源集团襄阳宜城发电有限公司
- Filing Date
- 2025-03-24
- Publication Date
- 2026-04-17
AI Technical Summary
In existing technologies, a fault in the circuit breaker's blocking electromagnet can prevent the circuit breaker from closing properly, making it impossible to accurately control the circuit breaker's status. This affects the stable and reliable operation of the power system, and may lead to power outages and accidents, especially in important locations such as hospitals and data centers.
A novel monitoring system for circuit breaker interlocking devices is designed. By connecting a current detection module in series in the interlocking electromagnet circuit, combined with a current relay and a comparison unit, the current signal is monitored in real time and compared with a preset threshold. The signal is then sent to the back-end management module for judgment and control through a signal transmission module, thereby achieving accurate monitoring and automated management of the circuit breaker status.
It improves the reliability and safety of circuit breaker interlocking devices, enhances operation and maintenance efficiency, realizes precise control and automated management of circuit breaker status, avoids the shortcomings of manual inspection, and ensures the stable operation of the power system.
Smart Images
Figure CN224137375U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit breaker monitoring, and in particular to a novel monitoring system for a circuit breaker interlocking device. Background Technology
[0002] In power systems, circuit breakers serve two main functions: firstly, to interrupt or close the normal current in a circuit; and secondly, to automatically interrupt the fault current when a circuit fault occurs (such as a short circuit or overload), preventing the fault from escalating. A circuit breaker malfunction can lead to numerous serious consequences. For example, if a circuit breaker fails to close properly, some lines or equipment may not be energized, causing power outages. This is especially critical in locations with high requirements for power continuity, such as hospitals, data centers, and power plants. Therefore, the stable and reliable operation of circuit breakers in power systems is extremely important. Circuit breaker closing control circuits typically include interlocking electromagnets, whose main function is to ensure the circuit breaker closes at the appropriate point, achieving precise control over the closed state. If the interlocking electromagnet malfunctions, the switch may fail to close properly or may close arbitrarily, affecting the normal operation of the switch and potentially leading to production interruptions and accidents, severely impacting production safety and the economy. Traditional methods for monitoring interlocking electromagnet faults involve continuous visual observation of the electromagnet's operating status. Therefore, timely and accurate fault monitoring of the interlocking electromagnet's operating status is particularly important. Utility Model Content
[0003] The main objective of this invention is to provide a novel monitoring system for circuit breaker interlocking devices, which solves the problems in the prior art where circuit breakers cannot close properly and the circuit breaker status cannot be accurately controlled when a fault occurs in the circuit.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a novel monitoring system for a circuit breaker interlocking device, comprising: an interlocking electromagnet circuit, and a current detection module connected in series in the interlocking electromagnet circuit for detecting the current in the electromagnet circuit;
[0005] The current relay is electrically connected to the current detection unit and is used to receive the current signal detected by the current detection unit;
[0006] The current detection unit is electrically connected to the comparison unit, which is used to compare the current current value with the preset alarm threshold and the preset return threshold, and transmit the comparison result to the signal transmission module;
[0007] The signal transmission module is connected to the alarm contact of the current relay and is used to send the status signal of the alarm contact to the back-end management module based on the comparison result.
[0008] The backend management module is used to receive signals from the signal transmission module and signals from the circuit breaker in the working or test position, and to make corresponding judgments and controls.
[0009] In the preferred embodiment, the preset alarm threshold is set to be greater than the first rated current of the electromagnet, and the preset return threshold is set to the second rated current of the electromagnet, wherein the first rated current is less than the second rated current.
[0010] When the current relay has no working power, the alarm contacts are automatically in the open state;
[0011] When the power supply of the current relay is normal and the electromagnet current does not meet the alarm action current threshold, the alarm contact is in the open state.
[0012] When the current relay is powered normally and the electromagnet current exceeds the set alarm action current threshold and continues for a preset period of time, the alarm contact closes.
[0013] In a preferred embodiment, the current detection unit employs a milliampere-level current sensor.
[0014] In a preferred embodiment, the power input interface of the current relay is adapted to different specifications of operating power supplies.
[0015] In the preferred embodiment, the signal transmission module uses wired or wireless communication to send the status signal of the alarm contact to the back-end management module.
[0016] In the preferred embodiment, the back-end management module has a data storage unit and a monitoring unit, which are used to record information data such as the electromagnet current status, alarm information, and circuit breaker position, and can monitor and control based on the information data.
[0017] In the preferred embodiment, the alarm information from the backend management module is transmitted through audible and visual alarms, SMS notifications, or system pop-ups, allowing relevant personnel to promptly obtain abnormal information.
[0018] In the preferred embodiment, the backend management module is equipped with an operation permission management function, which restricts the operation to only personnel with the corresponding permissions.
[0019] In the preferred embodiment, a voltage detection unit is also provided, which uses a voltage sensor and presets a voltage threshold, and combines it with a current sensor to accurately monitor the current and voltage of the locking electromagnet.
[0020] The current and voltage detection unit has a self-calibration function, which is used to periodically calibrate its own detection accuracy.
[0021] In the preferred embodiment, the back-end management module automatically adjusts the preset alarm threshold, preset return threshold, and voltage threshold based on historical monitoring data to adapt to the normal operating range of the electromagnet under different working conditions.
[0022] This invention provides a novel monitoring system for a circuit breaker interlocking device. A current detection module is connected in series in the interlocking electromagnet circuit to monitor the current signal in real time and transmit it to the subsequent current relay and comparison unit. The current relay is connected to the current detection module and receives the detected current signal in real time. It compares the detected current signal with preset alarm thresholds and return thresholds. The comparison result is transmitted to the signal transmission module. After receiving the alarm signal from the signal transmission module and the current status signal of the circuit breaker (operating position or test position), the back-end management module makes judgments and controls, improving the reliability and safety of the circuit breaker interlocking device, increasing operation and maintenance efficiency, and realizing automated management. Attached Figure Description
[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0024] Figure 1 This is a schematic diagram of the overall closing circuit of the circuit breaker monitoring system used in this utility model;
[0025] Figure 2 This is a schematic diagram of the locking electromagnet monitoring device of this utility model. Detailed Implementation
[0026] Example 1
[0027] like Figure 1-2 As shown, a novel monitoring system for a circuit breaker interlocking device includes: an interlocking electromagnet (Y1) circuit, and a current detection module connected in series in the interlocking electromagnet (Y1) circuit for detecting the current in the electromagnet circuit.
[0028] The current relay is electrically connected to the current detection unit (L1, L2) and is used to receive the current signal detected by the current detection unit.
[0029] The current detection units (L1, L2) are electrically connected to the comparison unit and are used to compare the current current value with the preset alarm threshold and the preset return threshold, and transmit the comparison result to the signal transmission module.
[0030] The signal transmission module is connected to the alarm contact of the current relay and is used to send the status signal of the alarm contact to the back-end management module based on the comparison result.
[0031] The backend management module is used to receive signals from the signal transmission module and signals from the circuit breaker in the working or test position, and to make corresponding judgments and controls.
[0032] In this embodiment, the current detection module is connected in series in the interlocking electromagnet circuit to monitor the current signal in real time and transmit it to the subsequent current relay and comparison unit. The current relay is connected to the current detection module and receives the detected current signal in real time. It compares the detected current signal with the preset alarm threshold and return threshold. The comparison result is transmitted to the signal transmission module. After receiving the alarm signal from the signal transmission module and the current status signal of the circuit breaker (working position or test position), the back-end management module makes judgments and controls, which improves the working reliability and safety of the circuit breaker interlocking device, improves the operation and maintenance efficiency, and realizes automated management.
[0033] In the preferred embodiment, the preset alarm threshold is set to be greater than the first rated current of the electromagnet, and the preset return threshold is set to the second rated current of the electromagnet, wherein the first rated current is less than the second rated current; the first rated current is 80% of the rated current, and the second rated current is 90% of the rated current.
[0034] 1) When the current relay has no working power, the alarm contact will automatically be in the open state.
[0035] The alarm contact is disconnected, the system cannot detect the current, and therefore cannot trigger the alarm.
[0036] 2) When the power supply of the current relay is normal and the electromagnet current does not meet the alarm action current threshold, the alarm contact is in the open state; the system is in normal state.
[0037] 3) When the power supply of the current relay is normal, and the electromagnet current exceeds the set alarm action current threshold and continues for a preset period of time, the alarm contact closes.
[0038] When the alarm contact is closed, an alarm signal is sent to the backend management module, triggering corresponding protection measures.
[0039] In this embodiment, the alarm contacts are normally open contacts (3 and 4 are NO contacts), which remain open when the alarm conditions are not met, and close to output an alarm signal when the alarm conditions are met.
[0040] Taking the classic design circuit of a medium-voltage circuit breaker as an example, such as Figure 1 As shown, in the classic design circuit of a medium-voltage circuit breaker (within the red box), the switch opening and closing control circuit is connected to an auxiliary contact of a locking electromagnet (Y1). When the working position contact and the test position contact are closed, the locking electromagnet is activated, and the circuit breaker control circuit can open and close. Its main function is to prevent the switch from being closed when it is not in the working or test position, and to avoid the switch being mistakenly sent to the working position when it is closed, which could lead to equipment accidents.
[0041] The existing technology has the following problems: First, if the electromagnet fails to operate when it should, the remote operator may make an incorrect judgment and perform an incorrect operation, especially in the power plant auxiliary power switching system. One operating mode is the series switching mode, in which the standby switch is in the open position and the working switch is in the closed position. During switching, the working switch is opened and the standby switch is closed. If the electromagnet of the standby switch is not operating normally, the standby switch cannot be closed after the working switch trips during the switching process, which will lead to the loss of power to the auxiliary power plant and cause serious accidents. The consequences of such events are quite serious, especially during the generator startup process, which can cause significant economic losses. Second, electromagnet contact failure can lead to the switch being closed accidentally if the operator makes a mistake. Pushing the switch into the working position can cause the switch to explode.
[0042] This embodiment improves the system's intelligence level by real-time detection of current signals, setting reasonable alarm thresholds, transmitting alarm information to the backend management system, and making decisions based on equipment status signals. This not only provides effective support for equipment maintenance and troubleshooting, but also enhances security, improves operational efficiency, and enables automated management.
[0043] In the preferred embodiment, the current detection unit uses a sensor with a current in the milliampere range to ensure high-precision monitoring of the current of the locking electromagnet.
[0044] In the preferred solution, such as Figure 2 As shown, the power input interfaces (A1, A2) can be adapted to different specifications of working power supplies to improve the versatility and applicability of the equipment.
[0045] In this embodiment, the operating voltage specifications supported by the power input interfaces (A1, A2) are as follows:
[0046] 1) AC voltage: Supports common AC voltages, such as 110V, 220V, and 380V.
[0047] 2) AC voltage: Supports different DC voltage specifications, such as 12V, 24V, 48V, etc., to adapt to different electrical systems.
[0048] In the preferred embodiment, the signal transmission module uses wired or wireless communication to stably and reliably send the status signal of the alarm contact to the back-end management module.
[0049] In this embodiment, the signal transmission module may use communication methods such as Ethernet, Wi-Fi, Zigbee, or LoRa.
[0050] In the preferred embodiment, the backend management module has a data storage unit and a monitoring unit, which are used to record the electromagnet current status, alarm information and circuit breaker position information, and can monitor and control the information data.
[0051] In the preferred solution, alarm information from the backend management module is sent out via audible and visual alarms, SMS notifications, or system pop-ups, enabling relevant personnel to obtain abnormal information in a timely manner.
[0052] In the preferred embodiment, the backend management module is equipped with an operation permission management function, which restricts the access to only personnel with the corresponding permissions to lift the prohibition status.
[0053] In this embodiment, the back-end management module receives signals from the signal transmission module and signals from the circuit breaker in the working or test position. When the signals from the circuit breaker in the working or test position and the signals from the signal transmission module appear simultaneously on the back-end management module, the electromagnet operates normally. When the above conditions are not met, the electromagnet malfunctions, and the back-end management module immediately issues an abnormal alarm signal and prohibits personnel from operating it.
[0054] In the preferred embodiment, a voltage detection unit is also provided, which uses a combination of voltage and current sensors and presets a voltage threshold for accurate monitoring of the current and voltage of the locking electromagnet.
[0055] The current and voltage detection units have a self-calibration function, which is used to periodically calibrate their own detection accuracy.
[0056] In the preferred embodiment, the backend management module automatically adjusts the preset alarm threshold, preset return threshold, and voltage threshold based on historical monitoring data to adapt to the normal operating range of the electromagnet under different working conditions.
[0057] The technical solution in this embodiment is: Figure 1 The part outside the red box, ( Figure 1 A type of CS interlocking device, Figure 2(This is a schematic diagram of the CS device.) Its main function is to monitor the electromagnet's operation by monitoring the current in the electromagnet circuit. Taking the current design as an example, A1 and A2 are the power inputs for the relay; L1 and L2 are the current detection units; 3 and 4 are the NO contacts. This design requires monitoring current in the milliampere range, demanding high accuracy. The alarm current threshold is set to be greater than 80% of the electromagnet's rated current, and the return current value is set to 90% of the electromagnet's rated current. When the current relay has no power supply, the alarm contacts automatically open; when the current relay has a normal power supply and the electromagnet current does not meet the alarm current threshold... When the current relay is in a normal operating state and the electromagnet current exceeds the set alarm action current threshold, and this exceeds the threshold for 3 seconds, the alarm contact will close, outputting an alarm signal to a remote control. The remote control screen will then execute a logic check to determine if the circuit breaker's electromagnet is functioning correctly, as follows: if the circuit breaker's signal in the operating or test position and this signal appear simultaneously on the control panel, the electromagnet is considered to be operating normally. If no such condition occurs, the electromagnet is considered abnormal, and an abnormal alarm will be immediately issued to personnel, prohibiting further operation. Technicians can then quickly resolve the fault, ensuring the circuit breaker's reliable and stable operation. This completely avoids the significant drawbacks of relying solely on manual inspections, which required highly skilled personnel and real-time problem detection.
[0058] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.
Claims
1. A novel monitoring system for a circuit breaker lockout device, comprising: include: A current detection module is connected in series in the locked electromagnet circuit to detect the current in the electromagnet circuit. The current relay is electrically connected to the current detection unit and is used to receive the current signal detected by the current detection unit; The current detection unit is electrically connected to the comparison unit and is used to compare the current current value with the preset alarm threshold and the preset return threshold, and transmit the comparison result to the signal transmission module. The signal transmission module is connected to the alarm contact of the current relay and is used to send the status signal of the alarm contact to the back-end management module based on the comparison result. The backend management module is used to receive signals from the signal transmission module and signals from the circuit breaker in the working or test position, and to make corresponding judgments and controls.
2. The novel monitoring system of a circuit breaker lockout device according to claim 1, wherein, The preset alarm threshold is set to be greater than the first rated current of the electromagnet, and the preset return threshold is set to the second rated current of the electromagnet, wherein the first rated current is less than the second rated current. When the current relay has no working power, the alarm contacts are automatically in the open state; When the power supply of the current relay is normal and the electromagnet current does not meet the alarm action current threshold, the alarm contact is in the open state. When the current relay is powered normally and the electromagnet current exceeds the set alarm action current threshold and continues for a preset period of time, the alarm contact closes.
3. The novel monitoring system for the circuit breaker interlocking device according to claim 1, characterized in that, The current detection unit uses a milliampere-level current sensor.
4. The novel monitoring system for the circuit breaker interlocking device according to claim 1, characterized in that, The power input interface of the current relay is compatible with different specifications of operating power supplies.
5. The novel monitoring system for the circuit breaker interlocking device according to claim 1, characterized in that, The signal transmission module uses wired or wireless communication to send the status signal of the alarm contact to the backend management module.
6. The novel monitoring system for the circuit breaker interlocking device according to claim 1, characterized in that, The backend management module has a data storage unit and a monitoring unit, which are used to record the electromagnet current status, alarm information and circuit breaker position information, and can monitor and control based on the information data.
7. The novel monitoring system for the circuit breaker interlocking device according to claim 6, characterized in that, The alarm information from the backend management module is promptly obtained by relevant personnel through audible and visual alarms, SMS notifications, or system pop-ups.
8. The novel monitoring system for the circuit breaker interlocking device according to claim 7, characterized in that, The backend management module is equipped with an operation permission management function, which restricts the operation to only personnel with the corresponding permissions.
9. The novel monitoring system for the circuit breaker interlocking device according to claim 8, characterized in that, It is also equipped with a voltage detection unit, which uses a voltage sensor and presets a voltage threshold. Combined with a current sensor, it is used to accurately monitor the current and voltage of the locking electromagnet. The current and voltage detection unit has a self-calibration function, which is used to periodically calibrate its own detection accuracy.
10. The novel monitoring system for the circuit breaker interlocking device according to claim 9, characterized in that, The backend management module automatically adjusts the preset alarm threshold, preset return threshold, and voltage threshold based on historical monitoring data to adapt to the normal operating range of the electromagnet under different working conditions.