A small simulated circuit breaker fixture

Abstract

This utility model relates to the field of circuit breaker technology and discloses a small simulated circuit breaker fixture, including a signal input interface for receiving closing control signals and opening control signals; a bistable switching element electrically connected to the signal input interface; and a status output interface electrically connected to the bistable switching element, which outputs a corresponding closed or open status signal according to its current state. The electrical energy required for the fixture to switch states and operate is entirely provided by the line carrying the control signals, requiring no external power supply. This utility model, by employing a bistable switching element, accurately simulates the real operating characteristics of a circuit breaker. Its passive design makes it compact, portable, and safe to use, effectively solving the problems of inaccurate simulation, cumbersome operation, and safety risks associated with existing testing methods, significantly improving the efficiency and reliability of on-site commissioning of feeder terminals.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a tooling for a small simulated circuit breaker. Background Technology

[0002] In power systems, distribution automation is a crucial element in ensuring the safe and stable operation of the power grid. Intelligent devices such as feeder terminals and distribution terminals are widely used to monitor and control switching equipment on lines, such as pole-mounted circuit breakers and load switches. During the installation, commissioning, and subsequent maintenance of these intelligent devices, it is necessary to verify the correctness of their remote control and signaling functions, i.e., to test whether they can accurately receive closing and opening commands issued by the master station and correctly return the open or closed status of the switching equipment.

[0003] During on-site testing, directly operating the high-voltage circuit breaker itself for commissioning is usually infeasible or unsafe. This is because: firstly, frequent operation of high-voltage equipment poses safety risks and may affect the normal power supply to the line; secondly, during laboratory commissioning or some on-site construction phases, the actual circuit breaker may not yet be installed. Therefore, technicians generally require a portable simulation device to replace the actual circuit breaker in order to complete the testing of the feeder terminal control circuit.

[0004] However, existing technologies for this type of testing have significant shortcomings. A common method is to directly short-circuit the terminals using temporary jumpers or shorting wires. This method is cumbersome, inefficient, and prone to short circuits due to misoperation, potentially burning out the delicate electronic components inside the feeder terminal. A slightly improved method is to use a homemade test box containing ordinary relays and switches. However, these test boxes typically require an external power supply or a built-in battery to power the internal relays, resulting in large size, inconvenience in carrying, and limitations in field performance due to battery power constraints. More importantly, ordinary relays are monostable and require continuous power to remain engaged. This cannot accurately simulate the bistable operating characteristics of a circuit breaker's operating mechanism, which relies on mechanical self-holding after receiving a pulse signal, potentially leading to distorted test results.

[0005] Therefore, there is an urgent need for a specialized testing fixture that is compact, requires no external power supply, and can accurately simulate the real working characteristics of circuit breakers, in order to solve the problems of low efficiency, high risk, and inaccurate simulation of current testing methods. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a small simulated circuit breaker fixture, which aims to improve and solve the problems of simulation distortion, dependence on external power supply, cumbersome operation and safety risks in the existing simulated circuit breaker testing methods.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a small simulated circuit breaker fixture, comprising: The signal input interface is configured to receive closing control signals and opening control signals; A bistable switching element, the input of which is electrically connected to the signal input interface, has a first stable state and a second stable state, and is configured to switch to the first stable state in response to the closing control signal and to switch to the second stable state in response to the opening control signal. A status output interface, the input of which is electrically connected to the output of the bistable switching element, is configured to output a closed status signal when the bistable switching element is in the first stable state, and to output a separated status signal when the bistable switching element is in the second stable state.

[0008] As a further description of the above technical solution: The bistable switching element is a dual-coil magnetic latching relay; the first stable state is the set state of the dual-coil magnetic latching relay, and the second stable state is the reset state of the dual-coil magnetic latching relay.

[0009] As a further description of the above technical solution: The dual-coil magnetic latching relay includes normally open contacts and normally closed contacts; the status output interface outputs the closed status signal via the closure of the normally open contacts and outputs the open status signal via the closure of the normally closed contacts.

[0010] As a further description of the above technical solution: The signal input interface includes a remote signal input module, which has terminals for connecting to external test equipment.

[0011] As a further description of the above technical solution: The signal input interface includes a local signal input module, which is equipped with a closing button and a closing button. The closing button and the closing button are configured to generate the closing control signal and the closing control signal, respectively.

[0012] As a further description of the above technical solution: Further includes: A closed position indicator light is electrically connected to the status output interface and is used to provide a visual indication when the closed position status signal is output. The locator indicator light is electrically connected to the status output interface and is used to provide visual indication when the locator status signal is output.

[0013] As a further description of the above technical solution: Further includes: An unstorable signal analog circuit has an unstorable signal input terminal and an unstorable signal lamp configured to be illuminated in response to an unstorable analog signal applied to the unstorable signal input terminal.

[0014] As a further description of the above technical solution: The electrical energy required for the bistable switching element to switch to the first stable state or the second stable state is provided entirely by the line carrying the closing control signal or the opening control signal, without the need for an external independent power supply.

[0015] This utility model has the following beneficial effects: 1. In this invention, a dual-coil magnetic latching relay is used as a bistable switching element. This element can switch and permanently maintain its state in response to an instantaneous closing or opening control signal, without the need for continuous application of a control signal. It reproduces the physical characteristics of a real circuit breaker's single-operation, mechanically held state. Compared to ordinary relay solutions that require continuous energization to maintain the state, the simulation results of this solution are more realistic and the state is more stable, ensuring the accuracy of the test.

[0016] 2. This invention achieves passive operation. The power required for the operation of its internal bistable switching elements and indicator lights is entirely provided by the circuit of the device under test via the closing or opening control signal. This eliminates the need for a separate internal battery or external power interface, greatly reducing the overall size and weight of the device, making it very portable and particularly suitable for mobile operations in complex outdoor environments such as utility poles.

[0017] 3. In this utility model, the fixture is equipped with both a remote signal input module for connecting to external testing equipment and a local signal input module for local manual operation. Test personnel can verify the remote control function of the feeder terminal through the remote interface, or, without the terminal, directly simulate circuit breaker operation using the local close and open buttons to verify the functionality of the fixture itself or the downstream circuit. This dual-mode operation greatly facilitates fault location and functional verification. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a voltage conversion module for a small simulated circuit breaker fixture proposed in this utility model; Figure 2 This is a schematic diagram of the current conversion module of a small simulated circuit breaker fixture proposed in this utility model; Figure 3 This is a schematic diagram of the input and output signal module 1 of a small analog circuit breaker fixture proposed in this utility model. Figure 4 This is a schematic diagram of the input and output signal module 2 of a small analog circuit breaker fixture proposed in this utility model. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Reference Figures 1-4 One embodiment of this utility model provides a small simulated circuit breaker fixture, specifically including the following: The functions of the eight pins in the attached diagram are defined as follows: HZ+: Receives the closing control signal from the feeder terminal.

[0021] FZ+: Receives the trip control signal from the feeder terminal.

[0022] CN+: Common terminal for closing / opening control signals.

[0023] HW: Outputs the on / off status signal to the feeder terminal.

[0024] FW: Output position status signal to feeder terminal.

[0025] WCN: Receives or outputs unpowered analog signals.

[0026] YXCOM: Common terminal for status signals (HW, FW).

[0027] YKCOM: Common terminal for remote control circuits and indicator lights Specifically, a bistable switching element is used to accurately simulate the electrical and mechanical holding characteristics of a real circuit breaker. Through integrated input / output interfaces and indicator units, a fully functional, portable testing tool requiring no external power supply is achieved. First, a closing or opening control signal is received via the signal input interface. Then, this signal excites the bistable switching element to switch to the corresponding first stable state (closing) or second stable state (opening) and maintains it. Finally, the state change of the bistable switching element is linked to the status output interface to generate a corresponding closed or open status signal for feedback, illuminating the corresponding status indicator light. The entire process requires no external power supply, achieving miniaturization and portability of the device.

[0028] The above principle is achieved through the following structure. The signal input interface of this fixture consists of a remote signal input module and a local signal input module connected in parallel. The remote signal input module uses a set of 8-pin pluggable terminal blocks (female connector model ZX-GDVC-5.08-8P, plug model ZX-DGK-5.08-8P), while the local signal input module uses three TS-1109-6026 buttons: the first button is connected to CN+ and HZ+ at both ends, used to generate a closing control signal locally; the second button is connected to CN+ and FZ+ at both ends, used to generate a opening control signal locally; and the third button is connected to WCN and YXCOM at both ends, used to simulate an unstored energy state.

[0029] In this embodiment, the bistable switching element is specifically a dual-coil magnetic latching relay of model HFD2 / 012-S-LS. The HZ+ signal introduced from the signal input interface is connected to the set coil pin 1 of the relay after passing through a 10K resistor, and the FZ+ signal is connected to the reset coil pin 2 after passing through a 10K resistor. A set of status output contacts of the relay constitutes the core of the status output interface: its common terminal pin 4 is connected to YXCOM, normally closed contact pin 6 is connected to FW, and normally open contact pin 8 is connected to HW. When a closing control signal is received, the relay is set, pins 4 and 8 are connected, and HW outputs a closed status signal; when a opening control signal is received, the relay is reset, pins 4 and 6 are connected, and FW outputs an open status signal. In addition, another set of auxiliary contacts of the relay (pins 11, 16, 13, 15, 9) is connected in series to YKCOM to simulate the electrical interlocking circuit of a real circuit breaker.

[0030] To provide intuitive visual feedback, the fixture is also equipped with status indicator lights. The HW, FW, CN+, and WCN pins are each connected in parallel to the common terminal YKCOM via a 10K resistor and an XL-502SURD LED. Thus, when the HW pin outputs a closed status signal, the corresponding closed indicator light illuminates; when the FW pin outputs a closed status signal, the closed indicator light illuminates; and when the WCN pin receives a signal input or the corresponding button is pressed, the uncharged indicator light illuminates. Throughout operation, the power required for relay operation and the illumination of all indicator lights is supplied by the external feeder terminal via control signal lines, achieving a passive design and significantly enhancing the device's portability and ease of use in the field.

[0031] Working Principle: This device utilizes a bistable switching element to accurately simulate the electrical and mechanical holding characteristics of a real circuit breaker, thus creating a fully functional, stable, and portable testing tool that requires no external power supply. Specifically, the tool receives instantaneous closing or opening control signals through its signal input interface. These signals can originate from external testing equipment or be generated by a local button on the tool. This instantaneous signal is sufficient to excite the bistable switching element to switch to its corresponding first stable state (simulated closing) or second stable state (simulated opening). Due to the element's magnetic self-holding characteristic, it stably maintains this new state without the continuous application of a control signal. This state change then drives the status output interface to generate a stable and continuous closed or open status signal, used to provide feedback on the current simulated state to external equipment and simultaneously illuminate the status indicator light on the tool, providing intuitive visual confirmation for on-site operation. Throughout the entire process, all the electrical energy required to drive the bistable switching element and illuminate the indicator light is provided by the energy carried by the input control signal itself. This enables the tool to achieve a passive design, greatly improving its portability and ease of use in the field.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A small scale analog circuit breaker tooling, characterized by, include: The signal input interface is configured to receive closing control signals and opening control signals; A bistable switching element, the input of which is electrically connected to the signal input interface, has a first stable state and a second stable state, and is configured to switch to the first stable state in response to the closing control signal and to switch to the second stable state in response to the opening control signal. A status output interface, the input of which is electrically connected to the output of the bistable switching element, is configured to output a closed status signal when the bistable switching element is in the first stable state, and to output a separated status signal when the bistable switching element is in the second stable state.

2. A small size analog circuit breaker tooling according to claim 1, characterized in that: The bistable switching element is a dual-coil magnetic latching relay; the first stable state is the set state of the dual-coil magnetic latching relay, and the second stable state is the reset state of the dual-coil magnetic latching relay.

3. The tooling for a miniature simulated circuit breaker according to claim 2, characterized in that: The dual-coil magnetic latching relay includes normally open contacts and normally closed contacts; the status output interface outputs the closed status signal via the closure of the normally open contacts and outputs the open status signal via the closure of the normally closed contacts.

4. The tooling for a miniature simulated circuit breaker according to claim 1, characterized in that: The signal input interface includes a remote signal input module, which has terminals for connecting to external test equipment.

5. The tooling for a miniature simulated circuit breaker according to claim 1, characterized in that: The signal input interface includes a local signal input module, which is equipped with a closing button and a closing button. The closing button and the closing button are configured to generate the closing control signal and the closing control signal, respectively.

6. The tooling for a miniature simulated circuit breaker according to claim 1, characterized in that: Further includes: A closed position indicator light is electrically connected to the status output interface and is used to provide a visual indication when the closed position status signal is output. The locator indicator light is electrically connected to the status output interface and is used to provide visual indication when the locator status signal is output.

7. The tooling for a miniature simulated circuit breaker according to claim 1, characterized in that: Further includes: An unstorable signal analog circuit has an unstorable signal input terminal and an unstorable signal lamp configured to be illuminated in response to an unstorable analog signal applied to the unstorable signal input terminal.

8. The tooling for a miniature simulated circuit breaker according to claim 1, characterized in that: The electrical energy required for the bistable switching element to switch to the first stable state or the second stable state is provided entirely by the line carrying the closing control signal or the opening control signal, without the need for an external independent power supply.

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