CN202550501U - High voltage circuit breaker with closing coil overtemperature protection function - Google Patents

Abstract

A high-voltage circuit breaker with a closing coil over-temperature protection function belongs to the technical field of protection, and its composition includes a breaking device, a transmission device and an operating mechanism, and the operating mechanism includes an energy storage switch, a control switch, and a travel switch , auxiliary switch, energy storage motor, closing coil, opening coil and temperature relay, the energy storage switch controls the first intermediate relay, and the first normally open contact of the first intermediate relay and the normally closed contact of the travel switch are connected in series to control The second intermediate relay, the normally open contact of the second intermediate relay controls the energy storage motor, the normally closed contact is connected in series with the first normally open contact of the control switch, the normally closed contact of the auxiliary switch, and the normally closed contact of the temperature relay After controlling the closing coil, the second normally open contact of the control switch and the normally open contact of the auxiliary switch are connected in series to control the opening coil. The utility model can prevent the closing coil of the high-voltage circuit breaker from being burned due to excessive temperature, greatly reduces the maintenance cost of the equipment, and improves the reliability of the operation of the equipment.

Description

High-voltage circuit breaker with closing coil over-temperature protection function

technical field

The utility model relates to a high-voltage circuit breaker which can automatically cut off a power supply circuit when the temperature of a closing coil exceeds a set maximum limit value. It belongs to the technical field of switches.

Background technique

The high-voltage circuit breaker is the most important control and protection equipment in the power system. Its function is to put some or all electrical equipment into operation or out of operation according to the needs of the power system. When a fault occurs in a certain part of the power system, it cooperates with the protection device to quickly remove the faulty part from the system, reduce the scope of power failure, prevent the expansion of the accident, protect various electrical equipment in the system from damage, and ensure the safety of the fault-free part of the system. run.

The high-voltage circuit breaker is mainly composed of a breaking device, a transmission device and an operating mechanism. The function of the operating mechanism is to provide energy for the opening and closing operation of the breaking device and to achieve various specified operations. Contacts and other components of breaking devices. Figure 1 is the electrical schematic diagram of the traditional spring energy storage operating mechanism. Its working principle is: when the mechanism is in the state of opening without energy storage, the normally closed contact of the travel switch CK is connected, and the energy storage switch is closed at this time. K1, the first intermediate relay J1 acts, its normally open contacts J1-1 and J1-2 close, the second intermediate relay J2 acts accordingly, the normally closed contact J2-2 of J2 opens, and the normally open contact J2-1 Closed, the energy storage motor D is connected to the power supply, and the closing spring starts to store energy. After the energy storage is completed, the normally closed contact of the travel switch CK opens, the second intermediate relay J2 loses power, and its normally closed contact J2-2 closes. At this time, the control switch K2 is turned to the closed position, and the closing coil HQ will be energized When the electromagnet is activated, the mechanism performs closing operation.

However, in the process of use, it is found that because the operating mechanism of the high-voltage circuit breaker sometimes refuses to move due to jamming, the energization time of the closing coil HQ often exceeds its allowable range, resulting in overheating and burning of the coil. This phenomenon occurs frequently during use, which greatly increases the maintenance workload, increases the maintenance cost of the equipment, and reduces the reliability of the equipment operation.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a high-voltage circuit breaker with the over-temperature protection function of the closing coil, so as to reduce the maintenance cost of the equipment and improve the reliability of the equipment operation.

The said problem of the utility model is realized with following technical scheme:

A high-voltage circuit breaker with a closing coil over-temperature protection function, the composition includes a breaking device, a transmission device and an operating mechanism, and the operating mechanism includes an energy storage switch, a control switch, a travel switch, an auxiliary switch, an energy storage Motor, closing coil, opening coil, two intermediate relays and a temperature relay mounted on the closing coil, the energy storage switch controls the first intermediate relay, the first normally open contact of the first intermediate relay and the stroke The normally closed contact of the switch is connected in series to control the second intermediate relay, the normally open contact of the second intermediate relay controls the energy storage motor, and its normally closed contact is connected with the first normally open contact of the control switch and the normally closed contact of the auxiliary switch. The normally closed contacts of the point and temperature relays are connected in series to control the closing coil, and the second normally open contacts of the control switch and the normally open contacts of the auxiliary switch are connected in series to control the opening coil.

In the high-voltage circuit breaker with the over-temperature protection function of the closing coil, the second normally open contact of the first intermediate relay is connected in series in the control circuit of the closing coil, and the third normally open contact of the first intermediate relay is connected in series In the control loop of the opening coil.

The utility model adds a temperature relay to the control circuit of the traditional closing coil. When the temperature of the closing coil exceeds the set maximum limit, the normally closed contact of the temperature relay will automatically disconnect and cut off the power supply of the closing coil. circuit. The utility model can effectively prevent the closing coil of the high-voltage circuit breaker from being burned due to excessive temperature, greatly reduce the maintenance cost of the equipment, and improve the reliability of the operation of the equipment.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Figure 1 is an electrical schematic diagram of a spring operating mechanism of a traditional high-voltage circuit breaker;

Fig. 2 is the electrical schematic diagram of the utility model spring operating mechanism;

Figure 3 is a schematic diagram of the installation of the temperature relay.

The labels in the figure are: K1, energy storage switch; K2, control switch; CK, travel switch; DL, auxiliary switch; D, energy storage motor; HQ, closing coil; TQ, opening coil; J1, first middle Relay; J1-1, J1-2, J1-3, the normally open contact of the first intermediate relay; J2, the second intermediate relay; J2-1, the normally open contact of the second intermediate relay; J2-2, the second intermediate relay Two normally closed contacts of the intermediate relay; WJ, temperature relay.

Detailed ways

Referring to Figure 1, Figure 2 and Figure 3, the operating mechanism of the high voltage circuit breaker includes energy storage switch K1, control switch K2, travel switch CK, auxiliary switch DL, energy storage motor D, closing coil HQ, opening coil TQ and Two intermediate relays J1, J2. The energy storage switch K1 is connected in series with the control coil of the first intermediate relay J1, and the first normally open contact J1-1 of the first intermediate relay J1 and the normally closed contact of the travel switch CK are connected in series in the control loop of the second intermediate relay J2 Among them, the normally open contact J2-1 of the second intermediate relay J2 controls the energy storage motor D, its normally closed contact J2-2 is connected with the normally closed contact of the auxiliary switch DL, the first normally open contact of the control switch K2, The second normally open contact J1-2 of the first intermediate relay J1 is connected in series to control the closing coil HQ, the third normally open contact J1-3 of the first intermediate relay J1, the second normally open contact of the control switch K2, The normally open contacts of the auxiliary switch DL are connected in series to control the opening coil TQ.

After the improvement, a temperature relay WJ is added, the temperature sensing part of the temperature relay WJ is close to the surface of the closing coil HQ, and the normally closed contact of the temperature relay WJ is connected in series in the control circuit of the closing coil HQ. When the closing coil HQ works normally, the temperature of the coil is within the normal range, the normally closed contact of the temperature relay WJ is in a closed state, and the coil works normally; when the current in the closing coil HQ increases or is energized for a long time, the winding's When the temperature rises, when the winding temperature exceeds the set value of the temperature relay WJ, the normally closed contact of the temperature relay WJ is disconnected, and the power supply circuit of the closing coil HQ is cut off, and the closing coil HQ is powered off to be protected.

Claims (2)

1. primary cut-out with closing coil overtemperature prote function; It comprises cut-offs device, transmission device and operating mechanism; It is characterized in that; Said operating mechanism comprises energy storage switch (K1), control switch (K2), travel switch (CK), auxiliary switch (DL), energy storage motor (D), closing coil (HQ), switching winding (TQ), two auxiliary relays and is mounted on the temperature relay (WJ) on the closing coil (HQ); Said energy storage switch (K1) control first auxiliary relay (J1); First normally opened contact (J1-1) of first auxiliary relay and the normally-closed contact of travel switch (CK) series connection back control second auxiliary relay (J2); The normally opened contact of second auxiliary relay (J2-1) control energy storage motor (D); The normally-closed contact of first normally opened contact of its normally-closed contact and control switch (K2), the normally-closed contact of auxiliary switch (DL), temperature relay (WJ) the back control closing coil (HQ) of connecting, the normally opened contact series connection back control switching winding (TQ) of second normally opened contact of control switch (K2), auxiliary switch (DL).

2. according to the said primary cut-out of claim 1 with closing coil overtemperature prote function; It is characterized in that; Second normally opened contact (J1-2) of said first auxiliary relay is series in the control loop of closing coil (HQ), and the 3rd normally opened contact (J1-3) of first auxiliary relay is series in the control loop of switching winding (TQ).

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