Double-opening coil control method for 10KV spring energy storage mechanism type high-voltage circuit breaker

Abstract

The invention discloses a double-opening coil control method for a 10KV spring energy storage mechanism type high-voltage circuit breaker, which belongs to the technical field of circuit breakers, effectively solves the problem that the circuit breaker cannot be opened due to opening coil faults by arranging two independent opening coils Y1 and Y2, greatly improves the opening reliability, and has a wide application prospect in enterprises with high automatic production degree. For example, in iron and steel enterprises, the control method can avoid equipment accidents and logistics chaos caused by the fact that a circuit breaker cannot be switched off, safety and stability of the production process are powerfully guaranteed, economic losses caused by production interruption and equipment damage are greatly reduced, in addition, the technology is easy to implement, only existing field equipment needs to be transformed, and cost is saved. Large-scale equipment replacement is not needed, the implementation cost is low, high economical efficiency and practicability are achieved, and application and popularization in related industries are quite convenient.

Description

[0001] The present invention relates to the technical field of circuit breakers, and more particularly to a double-breaking coil control method for a 10KV spring energy storage mechanism high-voltage circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt the current under normal circuit conditions and close, carry and interrupt the current under abnormal circuit conditions within a specified time. It is mainly used for circuit distribution, protection and control.

[0003] In the existing technology, the mainstream technology for the tripping control of 10KV spring energy storage type high-voltage circuit breakers is to adopt a single tripping coil plus a spring energy storage mechanism. In production scenarios with a high degree of automation and close equipment coordination, such as steel enterprises, this control method has serious defects. Once the tripping coil has a short circuit or open circuit fault, the circuit breaker will not be able to achieve electric tripping. For example, on a steel production line, large mechanical equipment driven by multiple motors relies on circuit breakers to control the start and stop. When the circuit breaker cannot be tripped due to a tripping coil failure, the equipment control is out of sync, which will cause accidents such as collision and damage to the mechanical equipment. At the same time, the front and rear logistics control is disordered, resulting in the piling of raw materials or finished products, which not only affects production efficiency, but may also cause equipment damage and product loss, bringing huge economic losses to the enterprise. At present, when encountering such a fault, the only emergency solution is to manually press the tripping button on the circuit breaker body to trip the circuit breaker. However, manual operation in a high-voltage environment poses safety risks and cannot respond to the needs of automated production in a timely manner. Summary of the Invention

[0004] The present invention mainly provides a 10KV spring energy storage mechanism type high-voltage circuit breaker double opening coil control method, which can solve the problem of circuit breaker electric opening failure caused by opening coil failure (short circuit or open circuit) proposed in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method, comprising:

[0006] The Y1 coil operates normally, while the Y2 coil is a backup. A thermal relay KR and a time relay KT are installed in the control circuit. The tripping mechanism is also modified. During normal tripping, upon receiving a tripping command, the circuit breaker's interlocking switch and other related components operate in coordination, energizing the Y1 coil. This coil generates magnetic force, pushing the tripping mechanism and completing the circuit breaker's tripping operation. If the Y1 coil short-circuits, its operating current exceeds the rated current, and the thermal relay KR added to the Y1 line activates, cutting off the power supply to the Y1 coil. Simultaneously, KR's auxiliary contact KR1 switches the circuit to the tripping coil Y2, energizing it and completing the tripping operation. If the Y1 coil opens, the time relay KT begins operating. When the tripping voltage reaches the Y1 coil, KT begins timing. If the timing exceeds the set time, the Y1 coil is deemed abnormal and unable to trip. At this point, KT's time-delay contact closes, automatically switching the circuit to the Y2 coil, energizing it and completing the tripping operation.

[0007] Furthermore, the modification of the tripping mechanical structure is to extend the original tripping baffle and place the tripping coils Y1 and Y2 on both sides of the baffle respectively, to ensure that the two coils are flexible and reliable when operating and do not interfere with each other.

[0008] Furthermore, the operating current value of the thermal relay protection KR is accurately set according to the rated working current of the Y1 coil. When the actual working current of the Y1 coil exceeds the set rated current value, the thermal relay protection KR immediately operates to quickly cut off the power supply to the Y1 coil.

[0009] Furthermore, the setting time of the time relay KT matches the time required for the normal operation of the Y1 coil, ensuring that an open circuit fault of the Y1 coil can be accurately judged. The time is set to 2 seconds to ensure that the Y2 coil can be switched to the opening operation in time when a fault occurs.

[0010] Furthermore, the timing accuracy of the time relay KT meets the requirement for accurately judging the operating state of the Y1 coil.

[0011] Furthermore, the rated voltage, rated current, and resistance value parameters of the Y1 coil and the Y2 coil are the same, ensuring that a stable and consistent magnetic force can be provided to push the tripping mechanism during the switching process, thereby ensuring the stability and reliability of the tripping operation.

[0012] Furthermore, the auxiliary contact KR1 of the thermal relay protection KR has good electrical and mechanical properties, and can maintain a stable and reliable working state during frequent switching actions, ensuring that the circuit can be quickly and accurately switched to the Y2 coil when the Y1 coil is short-circuited.

[0013] The beneficial effects of the double-opening coil control method of a 10KV spring energy storage mechanism high-voltage circuit breaker of the present invention are as follows:

[0014] By setting up two independent tripping coils Y1 and Y2, the problem of circuit breaker failure resulting from tripping coil failure is effectively solved, greatly improving the tripping reliability. In enterprises with a high degree of automated production, such as steel enterprises, this control method can avoid equipment accidents and logistics chaos caused by circuit breaker failure, effectively ensuring the safety and stability of the production process, and significantly reducing the economic losses caused by production interruptions and equipment damage. In addition, the technology is simple to implement and only requires the modification of existing on-site equipment without the need for large-scale equipment replacement. The implementation cost is low, and it is highly economical and practical, making it very easy to promote and apply in related industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0016] Figure 1 This is a flow chart of a method for controlling a double-opening coil of a 10KV spring energy storage mechanism high-voltage circuit breaker according to the present invention;

[0017] Figure 2 This is a prior art working principle diagram of a 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method of the present invention;

[0018] Figure 3 This is a double breaking coil control principle diagram of a double breaking coil control method for a 10KV spring energy storage mechanism type high-voltage circuit breaker according to the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] like Figure 1-Figure 3 As shown, a technical solution is provided: a 10KV spring energy storage mechanism type high-voltage circuit breaker double opening coil control method, comprising:

[0022] Equipment modification:

[0023] Mechanical Structure Modification: Based on the requirements of the dual-trip coil control method, the original high-voltage circuit breaker tripping mechanism was modified. The original tripping baffle was extended, and the installation positions of the tripping coils Y1 and Y2 were carefully adjusted to be located on either side of the baffle. After the modification was completed, multiple rounds of debugging ensured that the two coils operated flexibly and reliably without interfering with each other, laying the foundation for subsequent stable tripping operations.

[0024] Control circuit adjustment: Install thermal relay protection KR and time relay KT in the control circuit. Thermal relay protection KR uses bimetallic strip as the sensing element. According to the rated working current of Y1 coil, use professional electrical testing equipment to accurately set the operating current value of thermal relay protection KR. When Y1 coil is working normally, the heat generated by the current passing through the bimetallic strip keeps the bimetallic strip in its original shape. Thermal relay protection KR is in monitoring state. Once Y1 coil is short-circuited, the current exceeds the rated value. The excessive current causes the bimetallic strip to generate too much heat. Due to the different thermal expansion coefficients of the two metals, the bimetallic strip will bend and deform. This deformation will trigger the mechanical mechanism inside thermal relay protection KR, quickly cut off the power supply of Y1 coil, and switch to Y2 coil through auxiliary contact KR1. Figure 3 (Double opening coil control principle diagram), through Figure 3 The connection relationship between the thermal relay protection KR, time relay KT, Y1 coil, Y2 coil and other related components in the control circuit can be clearly seen, and the changes in the current path under normal and fault conditions can be clearly seen. This helps to understand how the current is switched to the Y2 coil through the auxiliary contact KR1 after the thermal relay protection KR is activated, as well as the working logic of the entire control circuit;

[0025] Among them, the time relay KT uses a high-precision crystal oscillator as the timing reference. The crystal oscillator can generate a stable high-frequency oscillation signal. The high-frequency signal is divided into a suitable timing pulse through the frequency division circuit. When the trip voltage reaches the Y1 coil, the timing circuit is started, and the counter begins to count the timing pulses. The setting time of the time relay KT is set to 2 seconds (or within 2 seconds) to match the time required for the normal operation of the Y1 coil, and to ensure that KT has the timing accuracy required to accurately judge the operating state of the Y1 coil. By comparing the count value of the counter with the preset value, the time relay KT is automatically reset. In comparison, when the count value reaches the preset value, that is, when the timing reaches the set time, if the Y1 coil is open, KT determines that Y1 is abnormal and switches to the Y2 coil. In addition, Y1 coil and Y2 coil with exactly the same parameters such as rated voltage, rated current, and resistance value are selected to ensure that a stable and consistent magnetic force can be provided to push the opening mechanism during the switching process, thereby ensuring the stability and reliability of the opening operation. At the same time, the auxiliary contact KR1 of the thermal relay protection KR is strictly tested to ensure that it has good electrical and mechanical properties, and can maintain a stable and reliable working state during frequent switching actions.

[0026] Normal opening operation:

[0027] Instruction issuance: During the production process, when the production line needs to be stopped, the operator issues a trip instruction to the high-voltage circuit breaker through the central control system;

[0028] Tripping execution: The circuit breaker's interlocking switch and other related components quickly coordinate to energize the normally working Y1 coil. The Y1 coil generates a strong magnetic force, which smoothly pushes the tripping mechanism to trip the circuit breaker, promptly cutting off the power supply to the production line and causing the equipment to stop running smoothly. The entire tripping process is smooth and efficient.

[0029] Simulate fault tripping operation:

[0030] Y1 coil short-circuit fault handling: In a simulated experimental environment, a Y1 coil short-circuit fault was artificially created. In an instant, the operating current of the Y1 coil sharply exceeded the rated current. The thermal relay protection KR responded quickly and immediately cut off the power supply to the Y1 coil according to the set operating current value. At the same time, KR's auxiliary contact KR1 operated, quickly switching the circuit to the tripping coil Y2. After the Y2 coil was energized, it generated magnetic force to push the tripping mechanism, successfully completing the tripping operation. This avoided the situation where the circuit breaker could not be opened due to the Y1 coil short-circuit, effectively ensuring the safety of production equipment and personnel.

[0031] Y1 coil open circuit fault handling: Simulating the Y1 coil open circuit fault scenario, when the trip voltage reaches the Y1 coil, the Y1 coil cannot be energized and operate normally due to the open circuit. At this time, the time relay KT starts timing. When the timing reaches 2 seconds (set time), KT determines that the Y1 coil is abnormal and cannot perform the tripping action. Immediately, KT's delayed contact closes, automatically cutting the circuit to the Y2 coil. The Y2 coil is energized, generating sufficient magnetic force to push the tripping mechanism, successfully completing the tripping operation. This ensures that when the Y1 coil is open, the circuit breaker can still reliably trip, maintaining the stable operation of the power system.

[0032] It can be seen that the double-tripping coil control method of the 10KV spring energy storage mechanism high-voltage circuit breaker performs well in dealing with short-circuit and open-circuit faults of the tripping coil, significantly improving the reliability of the tripping. In production scenarios with a high degree of automation, it effectively avoids equipment accidents and logistics chaos caused by the failure of the circuit breaker to trip, effectively ensuring the safety and stability of the production process. Moreover, this technology only requires the modification of existing on-site equipment, the implementation process is simple, and there is no need for large-scale equipment replacement. It is highly economical and practical, and has broad prospects for promotion and application in related industries.

[0033] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method, characterized by: The Y1 coil operates normally, while the Y2 coil is a backup. A thermal relay KR and a time relay KT are installed in the control circuit. The tripping mechanism is also modified. During normal tripping, upon receiving a tripping command, the circuit breaker's interlocking switch and other related components operate in coordination, energizing the Y1 coil. This coil generates magnetic force, pushing the tripping mechanism and completing the circuit breaker's tripping operation. If the Y1 coil short-circuits, its operating current exceeds the rated current, and the thermal relay KR added to the Y1 line activates, cutting off the power supply to the Y1 coil. Simultaneously, KR's auxiliary contact KR1 switches the circuit to the tripping coil Y2, energizing it and completing the tripping operation. If the Y1 coil opens, the time relay KT begins operating. When the tripping voltage reaches the Y1 coil, KT begins timing. If the timing exceeds the set time, the Y1 coil is deemed abnormal and unable to trip. At this point, KT's time-delay contact closes, automatically switching the circuit to the Y2 coil, energizing it and completing the tripping operation.

2. A 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method according to claim 1, characterized in that: The modification of the opening mechanism structure is to extend the original opening baffle and place the opening coils Y1 and Y2 on both sides of the baffle respectively, to ensure that the two coils are flexible and reliable when operating and do not interfere with each other.

3. A 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method according to claim 1, characterized in that: The operating current value of the thermal relay protection KR is accurately set according to the rated working current of the Y1 coil. When the actual working current of the Y1 coil exceeds the set rated current value, the thermal relay protection KR immediately operates to quickly cut off the power supply to the Y1 coil.

4. A 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method according to claim 1, characterized in that: The setting time of the time relay KT matches the time required for the normal operation of the Y1 coil, ensuring that it can accurately judge when an open circuit fault occurs in the Y1 coil. The time is set to 2 seconds to ensure that it can switch to the Y2 coil for opening operation in time when a fault occurs.

5. A 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method according to claim 4, characterized in that: The timing accuracy of the time relay KT meets the requirement for accurately judging the operating state of the Y1 coil.

6. A 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method according to claim 1, characterized in that: The rated voltage, rated current and resistance value of the Y1 coil and the Y2 coil are the same, ensuring that a stable and consistent magnetic force can be provided to push the opening mechanism during the switching process, thereby ensuring the stability and reliability of the opening operation.

7. A 10KV spring energy storage mechanism type high voltage circuit breaker double opening coil control method according to claim 3, characterized in that: The auxiliary contact KR1 of the thermal relay protection KR has good electrical and mechanical properties, and can maintain a stable and reliable working state during frequent switching actions, ensuring that the circuit can be quickly and accurately switched to the Y2 coil when the Y1 coil is short-circuited.

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