CN206259268U - An Improved Energy Storage Control Circuit of Hydraulic Spring Circuit Breaker - Google Patents

Abstract

The utility model discloses a follow-on hydraulic spring circuit breaker's energy storage control return circuit, by the AC control power supply, motor energy storage switch, motor operation contactor and motor are constituteed, including the DC control power supply, two thermocouple relays, the DC control power supply is parallelly connected with two thermocouple relays respectively, thermocouple relay access motor operation contactor group on a parallel circuit, motor operation contactor group comprises a plurality of parallelly connected motor operation contactors, all be provided with first travel switch on every motor operation contactor's the circuit, second travel switch, wherein the second travel switch is established on the series circuit between first travel switch and motor operation contactor, the stroke of second travel switch is longer than the stroke of first travel switch, the thermocouple relay and the thermocouple relay group on another parallel circuit establish ties. The utility model has the advantages that: the energy storage control circuit of the hydraulic spring circuit breaker for preventing the energy storage motor from being burnt out due to excessive pressing and preventing the locking and opening and closing of the energy storage insufficient.

Description

An Improved Energy Storage Control Circuit of Hydraulic Spring Circuit Breaker

technical field

The utility model relates to the field of a secondary control circuit of an electric power system, in particular to an improved energy storage control circuit of a hydraulic spring circuit breaker.

Background technique

At present, domestic (such as Xi'an Switch Company) circuit breakers mostly use hydraulic spring energy storage, while foreign (SIEMENS, ABB, ALSTOM) circuit breakers mostly use spring energy storage. For circuit breakers using hydraulic spring energy storage (such as circuit breakers of model LW15A-550/Y), the purpose of adding a time relay to the switch energy storage control circuit is to protect the energy storage device and prevent excessive Suppress energy storage. However, if the performance of the time relay itself is unreliable (for example, the setting time of the time relay is wrong, the energy storage circuit is disconnected in advance, resulting in insufficient energy storage), it will bring huge hidden dangers to the reliability of the circuit breaker. Since the time relay is in an outdoor environment, it is easily affected by environmental humidity, heat, etc., resulting in unreliable performance.

According to the actual operation of the 500KV substation, it is found that the reliability of the time relay itself is low. Sometimes the time relay itself is open and the time relay cannot work normally. Sometimes the setting time is only a few seconds. It is easy to cut off the energy storage circuit in advance when the energy storage is insufficient. It will lead to blocking opening and closing; for example, in 2015, due to the failure of the time relay in a 500kV substation, the energy storage was insufficient, the blocking reclosing, and the reclosing was not possible after the line tripped, resulting in the expansion of the line fault. If the time relay of the circuit breaker energy storage control circuit is canceled, it will not prevent the energy storage from being excessively suppressed after the travel switch fails.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide an improved energy storage control circuit of a hydraulic spring circuit breaker.

In order to achieve the above object, the utility model has taken the following technical solutions:

An improved energy storage control circuit of a hydraulic spring circuit breaker is composed of an AC control power supply, a motor energy storage switch, a motor running contactor and a motor, including a DC control power supply and two thermocouple relays. Two thermocouple relays are connected in parallel, and the thermocouple relay on a parallel circuit is connected to a motor running contactor group. The motor running contactor group is composed of several parallel motor running contactors, and each motor running contactor The circuit of each is provided with a first travel switch and a second travel switch, wherein the second travel switch is set on the series circuit between the first travel switch and the motor running contactor, and the stroke of the second travel switch is larger than the first travel switch. A stroke switch has a long stroke, and the thermocouple relay on the other parallel circuit is connected in series with the thermocouple relay group.

Preferably, the AC control power supply is a 220V AC power supply, and the DC control power supply is a 220V DC power supply.

Preferably, the motor is a three-phase motor.

Preferably, the thermocouple relay group is composed of several parallel thermocouple relays.

The utility model has the advantages of:

1. When the failure of the first travel switch occurs, a signal is sent to the monitoring at this time, and the motor continues to run to cut off the second travel switch of the energy storage control circuit, the contactor of the motor running loses pressure, and the motor energy storage switch in the circuit is disconnected , the energy storage motor stops running;

2. It not only ensures that after the failure of the first travel switch, the motor energy storage control circuit is cut off by the second travel switch, the energy storage motor stops running, and the energy storage will not be excessively suppressed;

3. Since the time relay is not installed, there is no risk of cutting off the energy storage control circuit in advance, resulting in insufficient energy storage and blocking opening and closing.

Description of drawings

Fig. 1 is a schematic diagram of the energy storage control circuit of the hydraulic spring circuit breaker before the improvement of the embodiment of the present invention;

Fig. 2 is a schematic diagram of the energy storage control circuit of the hydraulic spring circuit breaker after the improvement of the embodiment of the utility model;

Marking meanings in the figure: 1. Motor running contactor group; 2. Thermocouple relay group; 8M, motor energy storage switch; 88M, motor running contactor; M, motor; SP1, first stroke switch; SP2, second stroke Switch; 47T, time relay; 49M, thermocouple relay.

detailed description

The content of the present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example

Referring to Figure 1, the energy storage control circuit of the previous hydraulic spring circuit breaker is improved. Its working principle is: when the energy storage of the circuit breaker is insufficient, the motor energy storage switch 8M is turned on, and the 220V DC control power supply is also turned on at the same time, and the motor runs The contactors 88M are energized respectively, and the contacts of the motor running contactor 88M in the running circuit of the three-phase motor M are turned on, the running circuit of the three-phase motor M is turned on, and the three-phase motor M runs to press and store energy for the hydraulic pressure. When the energy storage is sufficient, the first travel switch SP1 in the energy storage control circuit is disconnected, the energy storage control circuit is cut off, the motor running contactor 88M is de-energized, and the contact of the motor running contactor 88M in the three-phase motor M running circuit is broken. Open, the three-phase motor M stops running, and stops pressing and storing energy for the hydraulic pressure.

If the first stroke switch SP1 in the energy storage control circuit fails, the energy storage control circuit is cut off by the action of the time relay 47T: the action time of the time relay 47T is set to 150s. Since the energy storage suppression time is generally more than ten seconds, the time relay 47T The action time is greater than the energy storage pressing time. After turning on the 220V DC control power supply, the time relay 47T will count immediately. If the first travel switch SP1 fails, the energy storage control circuit is not cut off when the energy storage is sufficient. After 150s, the time relay 47T auxiliary contact Close the thermocouple relay 49M to get electricity, close the normally open contact of the thermocouple relay 49M, make the thermocouple relay 49M self-holding, disconnect the normally closed contact of the thermocouple relay 49M, thereby cutting off the energy storage control circuit. The thermocouple relay 49M in the motor circuit will also close the normally open node of the thermocouple relay 49M to cut off the energy storage control loop when the heat is generated to a certain extent.

Since the structure of each branch of the energy storage control circuit of the hydraulic spring circuit breaker before the improvement is consistent, and the technical features are the same, the description of each branch will not be repeated here.

Referring to Fig. 2, an energy storage control circuit of an improved hydraulic spring circuit breaker is composed of AC control power supply, motor energy storage switch 8M, motor running contactor 88M and motor M, including DC control power supply, two thermocouple relays 49M , the DC control power supply is respectively connected in parallel with two thermocouple relays 49M, and the thermocouple relay 49M on a parallel circuit is connected to the motor running contactor group 1. The motor running contactor group 1 is composed of several parallel motor running contactors 88M, each The circuit of each motor running contactor 88M is provided with a first travel switch SP1 and a second travel switch SP2, wherein the second travel switch SP2 is set on the series circuit between the first travel switch SP1 and the motor running contactor 88M, the second travel switch SP2 The stroke of the second stroke switch SP2 is longer than that of the first stroke switch SP1, and the thermocouple relay 49M on another parallel circuit is connected in series with the thermocouple relay group 2 .

Preferably, the AC control power supply is 220V AC power, and the DC control power supply is 220V DC power supply.

Preferably, the motor M is a three-phase motor.

Preferably, the thermocouple relay group 2 is composed of several parallel thermocouple relays 49M.

In the improved energy storage control circuit of the hydraulic spring circuit breaker, the time relay 47T in the energy storage control circuit of the hydraulic spring circuit breaker is changed to the second stroke switch SP2, and the stroke of the second stroke switch SP2 is larger than that of the first stroke switch SP1. The stroke is long, which not only ensures that the second stroke switch SP2 can cut off the energy storage control circuit after the failure of the first stroke switch SP1, and will not overpress the energy storage, but also prevents the energy storage control circuit from being cut off in advance due to the failure of the time relay 47T. As a result, the energy storage is insufficient, and the opening and closing of the lockout occurs. Even in rare cases, even if the first travel switch SP1 and the second travel switch SP2 fail at the same time, it avoids the risk of cutting off the energy storage control circuit in advance, resulting in insufficient energy storage of the circuit breaker and blocking opening and closing.

If the failure of the first travel switch SP1 occurs, a signal is sent to the monitoring at this time, and the three-phase motor M continues to run to cut off the second travel switch SP2 of the energy storage control circuit, the motor running contactor 88M loses voltage, and the motor energy storage is disconnected Switch 8M, the energy storage three-phase motor M stops running.

The improved energy storage control circuit of the hydraulic spring circuit breaker not only ensures that the motor energy storage control circuit is cut off by the second travel switch SP2 after the first travel switch SP1 fails, the energy storage three-phase motor M stops running without excessive pressure Energy storage: Since the time relay 47T is not installed, there is no risk of cutting off the energy storage control circuit in advance, resulting in insufficient energy storage and blocking opening and closing.

Since the structure of each branch of the energy storage control circuit of the improved hydraulic spring circuit breaker is consistent, and the technical features are the same, the description of each branch will not be repeated here.

The above detailed description is a specific description of the feasible embodiment of the utility model. This embodiment is not used to limit the patent scope of the utility model. Any equivalent implementation or change that does not deviate from the utility model should be included in this case within the scope of the patent.

Claims (4)

1. An improved energy storage control circuit of a hydraulic spring circuit breaker, which is composed of an AC control power supply, a motor energy storage switch, a motor running contactor and a motor, and is characterized in that it includes a DC control power supply, two thermocouple relays, and The DC control power supply is respectively connected in parallel with two thermocouple relays, and the thermocouple relays on a parallel circuit are connected to a motor running contactor group, and the motor running contactor group is composed of several parallel motor running contactors. The circuit of each motor running contactor is provided with a first travel switch and a second travel switch, wherein the second travel switch is set on the series circuit between the first travel switch and the motor running contactor, and the second travel switch The stroke of the travel switch is longer than that of the first travel switch, and the thermocouple relay on another parallel circuit is connected in series with the thermocouple relay group. 2. The improved energy storage control circuit of the hydraulic spring circuit breaker according to claim 1, wherein the AC control power supply is 220V AC, and the DC control power supply is 220V DC power supply. 3. The improved energy storage control circuit of a hydraulic spring circuit breaker according to claim 1, wherein the motor is a three-phase motor. 4. The improved energy storage control circuit of the hydraulic spring circuit breaker according to claim 1, characterized in that: the thermocouple relay group is composed of several parallel thermocouple relays.