Device for automatically detecting mechanical life of circuit breaker

Abstract

The invention relates to the technical field of circuit breaker mechanical life testing devices, and discloses a circuit breaker mechanical life automatic detection device which comprises a switch S7, a time relay KT1, a time relay KT2, a counter JS, a miniature circuit breaker, a line L and a line N. The miniature circuit breaker is used for providing short circuit and overload protection, the switch S7 is a main switch for controlling an AC 220V alternating current power supply, and the time relay KT1 and the time relay KT2 are connected with the counter JS. The S7 switch is used as a conventional switch for switching on and off a circuit, the L line is directly connected to a phase line output end of an AC 220V alternating current power supply, the N line is directly connected to a neutral line end of the AC 220V alternating current power supply, and the miniature circuit breaker is respectively connected to the L line and the N line. By automatically controlling the switching-on and switching-off actions of the circuit breaker mechanism and recording the switching-off and switching-on times, the device can be used for mechanical life test experiments of various circuit breakers.

Description

Technical Field

[0001] The present invention relates to the technical field of breaker mechanical life test devices, and more specifically to an automatic detection device for breaker mechanical life. Background Art

[0002] As an important control and protection device in the power system, the mechanical characteristics of a breaker directly affect the stability of the power system and the safety of equipment. These characteristics protect the power grid and equipment from damage under rated current, ensuring the stable operation of the power grid and the safety of other equipment. Therefore, it is necessary to develop an automatic detection device for breaker mechanical life that can realize real-time monitoring of the mechanical characteristics of breakers.

[0003] The automatic detection device for breaker mechanical life is mainly used to detect the mechanical life of breakers to ensure that they can still work properly after multiple operations. This is crucial for the stable operation of the power system. In the prior art, testers need to be on duty throughout the process to complete repetitive tasks such as mechanical action monitoring and data recording. In case of abnormalities, full-process automatic interruption protection cannot be achieved. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides an automatic detection device for breaker mechanical life, which solves the problem that in the prior art, testers need to be on duty throughout the process to complete repetitive tasks such as mechanical action monitoring and data recording, and full-process automatic interruption protection cannot be achieved in case of abnormalities.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: An automatic detection device for breaker mechanical life includes an S7 switch, a time relay KT1, a time relay KT2, a counter JS, a miniature circuit breaker, an L wire, and an N wire. The miniature circuit breaker is used to provide short-circuit and overload protection. The S7 switch is the main switch for controlling the AC220V AC power supply. The S7 switch is used as a conventional switch to turn the circuit on and off. The L wire is directly connected to the phase wire output terminal of the AC220V AC power supply, and the N wire is directly connected to the neutral wire terminal of the AC220V AC power supply. The miniature circuit breaker is respectively connected to the L wire and the N wire.

[0006] By adopting the above technical solutions, a device that can automatically control the closing and opening operations of the breaker mechanism and record the number of closing and opening operations can be obtained, which can be used to test the mechanical life of various breakers. At the same time, through an automated process, it replaces traditional manual operations, avoiding problems such as low efficiency and large errors that may be caused by traditional manual testing, thereby affecting the detection results.

[0007] Preferably, the L wire is connected to the S7 switch on the closing loop, and the L wire is connected to the S7 switch on the opening loop.

[0008] Preferably, the S7 switch in the closing circuit is connected in series with the coil of the time relay KT1, and the S7 switch in the opening circuit is connected in series with the coil of the time relay KT2.

[0009] Preferably, the normally closed contact of the time relay KT2 is directly connected to the coil of the time relay KT1.

[0010] Preferably, the other end of the coil of the time relay KT1 is connected to the N line.

[0011] Preferably, a pair of normally closed contacts of the time relay KT2 and the closing coil of the time relay KT1 are connected in series in the closing circuit of the circuit breaker.

[0012] Preferably, a pair of normally closed contacts of the time relay KT1 and the opening coil of the time relay KT2 are connected in series in the opening circuit of the circuit breaker.

[0013] Preferably, the normally closed contact of the time relay KT1 and the coil of the time relay KT2 are connected in series, and the normally closed contact of the time relay KT2 and the coil of the time relay KT1 are connected in series, thus forming an interlocked connection relationship.

[0014] Preferably, the input signal of the counter JS is connected to the normally open contact of the circuit breaker to be tested, and the counter JS is connected in parallel across the two ends of the normally closed contact of the time relay KT2.

[0015] Preferably, the two ends of the counter JS are respectively connected to the miniature circuit breaker on the L line and the miniature circuit breaker on the N line.

[0016] Working principle: First, the miniature circuit breakers on the L line and N line play the role of protecting the circuit against overload and short circuit. When there are overload or short circuit problems in the circuit, the miniature circuit breakers will trip automatically, thus cutting off the power supply of the entire circuit to protect the equipment in the circuit and prevent damage due to overcurrent. When the switch S7 on the closing loop is closed, the AC220V AC power supply will supply power to the closing loop through the L line. The normally closed contact of the time relay KT2 is closed. At this time, the counter JS is short-circuited. Whether the normally open contact of the circuit breaker is closed or not, the counter JS will not generate a count. This can reduce the misoperation of the counter JS and improve the reliability of the counting function of this circuit. Then the current passes through the normally closed contact of the time relay KT2, causing the coil of the time relay KT1 to be energized and attracted, thus forming a closing loop. After the coil of the time relay KT1 is energized, it will start timing and then have a certain time delay. After the delay time ends, the normally closed contact of the time relay KT1 disconnects, which can enable the circuit breaker to complete the closing action, thus realizing the delayed closing function of the circuit breaker. When the circuit breaker needs to perform a tripping action, the S7 switch on its tripping loop is closed, so that the AC220V AC power supply supplies power to the tripping loop through the L line. At this time, the time relay KT1 will start timing again and have a certain time delay. Its normally closed contact remains closed. Then the attracting coil of the time relay KT2 will be energized, and at the same time, the time relay KT2 is also energized, and its normally closed contact disconnects. After the normally closed contact of the time relay KT2 disconnects, since the two ends of the counter JS are respectively connected to the miniature circuit breakers on the L line and N line, this can supply power to the counter JS and play a role in protecting the counter JS in case of overload and short circuit faults in the circuit. At this time, the current will pass through the counter JS, causing the counter JS to obtain voltage and start working. At the same time, the normally open contact of the circuit breaker also needs to remain closed. The counter JS will generate a trigger count once, and at the same time, the circuit breaker can maintain the closed state. When the time relay KT1 delay ends, at this time, its normally closed contact will also disconnect, thus disconnecting the power supply of the attracting coil of the time relay KT2. The time relay KT2 will also lose power, and its normally closed contact closes, which can enable the circuit breaker to complete the tripping action, thus realizing the delayed tripping function of the circuit breaker. When the normally closed contact of the time relay KT2 disconnects again, the counter JS will count again. By counting the count of the counter JS, it can help maintenance personnel judge the service life and health status of the circuit breaker to be detected, so as to perform maintenance or replacement in time. At the same time, through this circuit design, the closing and tripping times of the circuit breaker mechanism can be automatically controlled without manual intervention.

[0017] The present invention provides an automatic detection device for the mechanical life of a circuit breaker. It has the following beneficial effects: The present invention automatically controls the closing and opening actions of the circuit breaker mechanism, and can record the number of opening and closing operations, which can be used for the mechanical life test of various circuit breakers.

[0018] Through automatic control, the present invention can achieve unattended operation, thereby replacing traditional manual operation. At the same time, it reduces manual intervention and improves the test efficiency.

[0019] Through the control method of electrical interlock, the present invention can realize fully automatic and highly reliable mechanical life test, and at the same time achieve the effect of double circuit isolation protection to prevent misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the circuit structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to the attached Figure 1 The present invention provides an automatic detection device for the mechanical life of a circuit breaker, including an S7 switch, a time relay KT1, a time relay KT2, a counter JS, a miniature circuit breaker, an L wire and an N wire. The miniature circuit breaker is used to provide short-circuit and overload protection. The S7 switch is the main switch for controlling the AC220V AC power supply. The S7 switch is used as a conventional switch to turn on and off the circuit. The L wire is directly connected to the phase wire output terminal of the AC220V AC power supply, and the N wire is directly connected to the neutral wire terminal of the AC220V AC power supply. The miniature circuit breaker is respectively connected to the L wire and the N wire; Specifically, the L wire is the live wire and can be connected to the output terminal of the AC220V AC power supply. As the live conductor in the AC circuit, it is responsible for delivering the 220V voltage from the power supply to the required time relay or counter JS device, so that the required device can operate. The N wire is the neutral wire, which can form a closed loop with the L wire to provide a path for the current to return to the power supply, thereby ensuring that the circuit can work normally. The miniature circuit breaker can simultaneously disconnect the L wire and the N wire to ensure that the test device is completely isolated from the power supply. At the same time, the connection between the L wire and the miniature circuit breaker can play a role in protecting the main circuit when there are overload and short-circuit faults in the circuit. The connection between the N wire and the miniature circuit breaker can prevent the N wire from overheating or insulation damage due to abnormal current. By operating the miniature circuit breaker to open and close, the test process can be quickly reset. Please refer to the attached Figure 1, the L line is connected to the S7 switch on the closing circuit, and the L line is connected to the S7 switch on the opening circuit; Specifically, by pressing the S7 switch on the closing circuit, the power supply on the L line can be controlled to be delivered or cut off to the closing circuit, and by pressing the S7 switch on the opening circuit, the power supply on the L line can be controlled to be delivered or cut off to the opening circuit.

[0023] Please refer to the appendix Figure 1 , the S7 switch in the closing circuit is connected in series with the coil of the time relay KT1, and the S7 switch in the opening circuit is connected in series with the coil of the time relay KT2; Specifically, through the S7 switch, it can be controlled whether the current on the L line flows into the coil of the time relay KT1, and at the same time, through the S7 switch, it can be controlled whether the current on the L line flows into the coil of the time relay KT2.

[0024] Please refer to the appendix Figure 1 , the normally closed contact of the time relay KT2 is directly connected to the coil of the time relay KT1; Specifically, through the connection between the normally closed contact of the time relay KT2 and the coil of the time relay KT1, a certain degree of interlock can be carried out between the two time relays to prevent the time relay KT1 and the time relay KT2 from being energized and working at the same time, resulting in equipment failure.

[0025] Please refer to the appendix Figure 1 , the other end of the coil of the time relay KT1 is connected to the N line; Specifically, through the connection between the coil of the time relay KT1 and the N line, a complete current loop can be formed when the coil of the time relay KT1 is energized, so that it can work normally and complete its delay function.

[0026] Please refer to the appendix Figure 1 , a pair of normally closed contacts of the time relay KT2 and the suction coil of the time relay KT1 are connected in series in the closing circuit of the circuit breaker; Specifically, when the normally closed contact of the time relay KT2 is closed and there is a closing signal, the current can flow into the coil of the time relay KT1 to be energized and attracted, and then a certain delay time is generated. When the time relay KT1 delay ends, its normally closed contact disconnects, thereby forcibly cutting off the power supply circuit of the time relay KT1. Thus, the timed power-off protection function and the delayed automatic closing function of the circuit breaker can be realized.

[0027] Please refer to the appendix Figure 1 , a pair of normally closed contacts of the time relay KT1 and the suction coil of the time relay KT2 are connected in series in the opening circuit of the circuit breaker; Specifically, when the circuit breaker needs to trip, the AC 220V AC power supply is connected to the tripping circuit through the L wire. At this time, the normally closed contact of the time relay KT1 remains closed, so that the suction coil of the time relay KT2 can be energized. When KT1 reaches the set delay time, its normally closed contact disconnects, cutting off the power supply of the suction coil of KT2, triggering the circuit breaker to trip, thus realizing the delayed automatic tripping function of the circuit breaker.

[0028] Please refer to the appendix Figure 1 , the normally closed contact of the time relay KT1 and the coil of the time relay KT2 are connected in series, and the normally closed contact of the time relay KT2 and the coil of the time relay KT1 are connected in series, thus forming an interlocked connection relationship; Specifically, through this series connection, an interlock function can be achieved, realizing the mutual restriction of the operating states between the two time relays KT1 and KT2, preventing the time relay KT2 from starting suddenly when the conditions are not met, ensuring the safe and stable operation of the circuit. Through this interlock control method, it is ensured that the time relays KT1 and KT2 will not be energized simultaneously, thus avoiding the risk of power short - circuit.

[0029] Please refer to the appendix Figure 1 , the input signal of the counter JS is connected to the normally open contact of the circuit breaker under test, and the counter JS is connected in parallel across the two ends of the normally closed contact of the time relay KT2; Specifically, by connecting the counter JS in parallel across the normally closed contact of the time relay KT2, when the contact of the time relay KT2 is closed, the counter JS is short - circuited and does not count. After the time relay KT2 operates and its contact disconnects, and when the normally open contact of the circuit breaker under test is closed, the counter JS is energized and counts once through the power supply loop. Thus, the counter JS realizes the counting function by monitoring the number of operations of the normally closed contact of the time relay KT2 and the operating state of the circuit breaker, thereby performing counting statistics on the operations of the circuit breaker within a specific time period, which helps to analyze its operating conditions in different delay time periods. Please refer to the appendix Figure 1 , both ends of the counter JS are respectively connected to the miniature circuit breaker on the L wire and the miniature circuit breaker on the N wire; Specifically, through this connection method, power can be supplied to the counter JS, enabling the counter JS to count. At the same time, the miniature circuit breaker can provide a protection function for the counter JS in case of short - circuit or overload in the circuit.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Automatic mechanical life detection device for circuit breakers, comprising an S7 switch, a time relay KT1, a time relay KT2, a counter JS, a miniature circuit breaker, an L wire and an N wire, characterized in that: The miniature circuit breaker is used to provide short - circuit and overload protection. The S7 switch is the main switch for controlling the AC220V AC power supply. The S7 switch is used as a conventional switch to turn the circuit on and off. The L wire is directly connected to the phase - wire output terminal of the AC220V AC power supply, and the N wire is directly connected to the neutral - wire terminal of the AC220V AC power supply. The miniature circuit breaker is respectively connected to the L wire and the N wire.

2. The automatic mechanical life detection device for a circuit breaker according to claim 1, wherein: The L wire is connected to the S7 switch on the closing circuit and the L wire is connected to the S7 switch on the opening circuit.

3. The automatic mechanical life detection device for a circuit breaker according to claim 1, wherein: The S7 switch in the closing circuit is connected in series with the coil of the time relay KT1, and the S7 switch in the opening circuit is connected in series with the coil of the time relay KT2.

4. The automatic mechanical life detection device for a circuit breaker according to claim 1, wherein: The normally - closed contact of the time relay KT2 is directly connected to the coil of the time relay KT1.

5. The automatic mechanical life detection device for a circuit breaker according to claim 1, characterized in that: The other end of the coil of the time relay KT1 is connected to the N wire.

6. The automatic mechanical life detection device for a circuit breaker according to claim 1, wherein: A pair of normally - closed contacts of the time relay KT2 and the suction coil of the time relay KT1 are connected in series in the closing circuit of the circuit breaker.

7. The automatic detection device for the mechanical life of a circuit breaker according to claim 1, characterized in that: A pair of normally - closed contacts of the time relay KT1 and the suction coil of the time relay KT2 are connected in series in the opening circuit of the circuit breaker.

8. The automatic mechanical life detection device for a circuit breaker according to claim 1, characterized in that: The normally - closed contact of the time relay KT1 and the coil of the time relay KT2 are connected in series, and the normally - closed contact of the time relay KT2 and the coil of the time relay KT1 are connected in series, thus forming an interlocked connection relationship.

9. The automatic mechanical life detection device for circuit breakers according to claim 1, characterized in that: The input signal of the counter JS is connected to the normally - open contact of the circuit breaker under test, and the counter JS is connected in parallel across the two ends of the normally - closed contact of the time relay KT2.

10. The automatic mechanical life detection device for a circuit breaker according to claim 1, wherein: The two ends of the counter JS are respectively connected to the miniature circuit breaker on the L wire and the miniature circuit breaker on the N wire.

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