Circuit structure for preventing mis-tripping caused by grounding of positive power supply of operation loop
By introducing protective action nodes, distributed capacitance, and adjustable voltage divider resistors into the circuit, the problem of relay maloperation caused by grounding of the positive power supply in the operating circuit is solved, ensuring circuit stability and preventing false tripping.
Patent Information
- Application Number
- CN202423110091.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Grounding of the positive power supply in the operating circuit can cause the relay to malfunction and trigger false tripping. This is especially true when the cable is long and the distributed capacitance is large, which may lead to relay malfunction.
By introducing a protection action node, distributed capacitance, trip relay, and normally closed contact of the relay into the circuit, and adjusting the voltage divider resistor, the operating voltage of the relay is kept between 60% and 70% Vn, ensuring that the energy of the distributed capacitance is insufficient to drive the trip relay.
This effectively avoids relay malfunctions, prevents accidental tripping, and improves the reliability and stability of the circuit.
Smart Images
Figure CN223553031U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power protection technology, specifically relating to a circuit structure that prevents false tripping caused by grounding of the positive power supply in the operation circuit. Background Technology
[0002] When the DC system is operating normally, the positive terminal of the operating power supply is +110V to ground and the negative terminal is -110V to ground. When the positive terminal of the operating power supply is grounded, the positive terminal is 0V to ground and the negative terminal is -220V to ground. At this time, a voltage drop of -110V is generated between the relay coil input terminal M and the negative terminal. If the cable connecting M to the outside is long, its distributed capacitance C to ground is large enough, which may cause the relay K to malfunction and trip. Utility Model Content
[0003] The purpose of this invention is to provide a circuit structure that prevents false tripping caused by grounding of the positive power supply in the operating circuit, so as to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a circuit structure to prevent false tripping caused by grounding of the positive power supply in the operating circuit, comprising...
[0005] Protection action nodes, distributed capacitance C, trip relays, and normally closed contacts of relays;
[0006] One end of the protection action node is connected to the positive terminal of the power supply, and the other end of the protection action node is connected to the distributed capacitor C and the trip relay respectively. The other end of the trip relay is connected to the resistor R2, and the other end of the resistor R2 is connected to the negative terminal of the power supply.
[0007] One end of the normally closed contact of the relay is connected to the coil input terminal of the trip relay, and the other end of the normally closed contact of the relay is connected to resistor R1. The other end of resistor R1 is connected to the negative terminal of the power supply.
[0008] Preferably, the other end of the distributed capacitance C is grounded.
[0009] In any of the above embodiments, it is preferred that the end of the distributed capacitance C furthest from the ground is connected to the coil input terminal of the trip relay.
[0010] When the DC system is operating normally, the positive terminal of the operating power supply is +110V to ground and the negative terminal is -110V to ground. When the positive terminal of the operating power supply is grounded, the positive terminal is 0V to ground and the negative terminal is -220V to ground. At this time, a voltage drop of -110V is generated between the input terminal M of the relay coil and the negative terminal. If the cable connecting point M to the outside is long, its distributed capacitance C to ground is large enough, which may cause the relay K to malfunction.
[0011] The technical effects and advantages of this utility model are as follows: The circuit structure that prevents false tripping due to grounding of the positive power supply in the operating circuit increases the starting power by adjusting the voltage divider resistor R2 of the relay so that the operating voltage of the relay is between 60% and 70% of Vn. Figure 1 As shown in K-1 and R1, the energy of the distributed capacitance C is not sufficient to drive the trip relay K, thus avoiding malfunction of the relay K and the occurrence of false tripping. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0013] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0014] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.
[0016] This utility model provides, for example Figure 1 The circuit structure shown is designed to prevent false tripping caused by grounding of the positive power supply in the operating circuit, including...
[0017] The protection action node is a switch;
[0018] Distributed capacitance C, trip relay K;
[0019] The normally closed contact K-1 of the relay is a switch.
[0020] One end of the protection action node is connected to the positive terminal of the power supply, and the other end of the protection action node is connected to the distributed capacitor C and the trip relay respectively. The other end of the distributed capacitor C is grounded, and the end of the distributed capacitor C away from the ground is connected to the coil input terminal M of the trip relay. The other end of the trip relay is connected to the resistor R2, and the other end of the resistor R2 is connected to the negative terminal of the power supply.
[0021] One end of the normally closed contact of the relay is connected to point M, the coil input terminal of the trip relay, and the other end of the normally closed contact of the relay is connected to resistor R1. The other end of resistor R1 is connected to the negative terminal of the power supply.
[0022] Adjust the voltage divider resistor R2 of the relay so that the relay's operating voltage is between 60% and 70% of Vn, thereby increasing the starting power. Figure 1 As shown in K-1 and R1, ensure that the energy of the distributed capacitance C is insufficient to drive the trip relay K.
[0023] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A circuit structure for preventing false tripping caused by grounding of the positive power supply in the operating circuit, characterized in that: include Protection action nodes, distributed capacitance C, trip relays, and normally closed contacts of relays; One end of the protection action node is connected to the positive terminal of the power supply, and the other end of the protection action node is connected to the distributed capacitor C and the trip relay respectively. The other end of the trip relay is connected to the resistor R2, and the other end of the resistor R2 is connected to the negative terminal of the power supply. One end of the normally closed contact of the relay is connected to the coil input terminal of the trip relay, and the other end of the normally closed contact of the relay is connected to resistor R1. The other end of resistor R1 is connected to the negative terminal of the power supply.
2. The circuit structure for preventing false tripping due to grounding of the positive power supply in the operating circuit according to claim 1, characterized in that: The other end of the distributed capacitance C is grounded.
3. The circuit structure for preventing false tripping due to grounding of the positive power supply in the operating circuit according to claim 1, characterized in that: The end of the distributed capacitor C furthest from the ground is connected to the coil input terminal of the trip relay.