JPH0821289B2 - Fluid pressure operating device monitoring system for switchgear - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) The present invention relates to a monitoring system for a fluid pressure operating device that drives a power switchgear applied to a power system.

(Prior Art) In recent years, devices that require high-speed operation, such as circuit breakers,
A fluid pressure operation device using a fluid such as oil is used. An example of such a fluid pressure operating device will be described with reference to FIG.

A fluid 2 such as oil is stored in the tank 1, and the fluid 2
Is transferred to the accumulator 5 via the pump unit 3 and the pipe 4 connected to the tank 1. The accumulator 5 is divided into a gas chamber 6a and a fluid chamber 6b by its piston 5a, and is driven by a motor 12 in a pump unit 3
When the fluid 2 flows into the fluid chamber 6b by the action of, the gas chamber 6a on the opposite side of the piston 5a is filled with a gas 6 such as nitrogen gas, and the gas 6 is compressed through the piston 5a. Then, the fluid 2 has a high pressure and is stored in the accumulator 5. The fluid 2 whose pressure has been increased is guided to the drive unit 8 of the electric power equipment through the pipe 7, and the fluid 2 in the drive unit 8 is connected to the pipe 9
Return to tank 1 via. That is, the drive unit 8 is composed of the pipes 7, 9
Cylinder 16 connected to, and piping 7, 9 in cylinder 16
It is composed of a piston 15 provided between the piston 15 and an operation rod 14 that moves integrally with the piston 15, and the pipe 7 and the pipe 9 are connected by a closing valve 10. Also, a trip valve 11 is provided on the tank 1 side. Therefore, when the equipment is turned on, the closing valve 10 is opened and the trip valve 11 is opened.
Is closed and the fluid 2 is caused to flow into the rear surface side of the piston 15 through the pipe 9, and the tripping is performed by causing the fluid 2 to flow into the front surface side of the piston 15 by a reverse operation.

By the way, since the pressure applied to the fluid 2 in the fluid pressure operating device usually reaches several hundreds of atmospheric pressure, the gas 6 in the accumulator 5 is also compressed by the pressure. In such a state where the gas 6 is compressed to several hundred atmospheric pressure for a long time, it is extremely difficult to prevent the gas from leaking, and the gas gradually leaks from the seal portion. When the amount of gas is significantly reduced, the fluid pressure drops greatly when the switchgear is operating, which makes continuous operation impossible, and even a single operation may stop during operation. Such a malfunction of the switchgear causes a serious accident such as a ground fault of the switchgear, which leads to a complete stoppage of the substation, and has a huge impact on society.

(Problems to be Solved by the Invention) In the fluid pressure operation device for electric power equipment as described above, the leakage of the high-pressure gas filled in the accumulator is unavoidable, which causes a great adverse effect on the operation of the equipment. There was a problem to give.

The present invention solves the problems of the prior art as described above,
An object of the present invention is to provide a fluid pressure operating device monitoring system for switchgear devices that can prevent inoperability of the device due to gas leakage by monitoring the amount of gas in the accumulator.

[Configuration of Invention] (Means for Solving Problems) A fluid pressure operating device monitoring system for a switchgear according to the present invention comprises:
The pump unit is provided with a pump operating time detecting means, and the tank is provided with an internal fluid level detecting means.
These detecting means are connected to a data processing device for comparing the detected motion time and the fluid surface level of the pump with a preset reference operation time and reference fluid surface level, and the detected operation time is longer than the reference operation time, When the detected fluid surface level is lower than the reference fluid surface level, the output means connected to the data processing device instructs the gas leak in the accumulator.

(Operation) When the amount of gas in the accumulator decreases, the system of the present invention having the above-described configuration compares with a state in which a predetermined amount of gas is present in the accumulator when the pump is operated to increase the fluid pressure. Then, it takes a long time for the fluid pressure to reach the set value, and at the same time, the fluid is transferred into the accumulator by the amount of the gas decrease, so that the fluid level in the tank lowers. The leak of the gas inside is detected.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to FIGS. 1 and 2. The same parts as those in the prior art shown in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a piping diagram showing the overall configuration of the system of the present embodiment, and FIG. 2 is a circuit diagram showing an example of pump operating time detecting means in the system of FIG.

* Structure of Embodiment As shown in FIG. 1, the motor 12 of the pump unit 3 provided in the tank 1 is provided with its operating time measuring means 40, and this operating time measuring means 40 is provided in the data processing device 50. In addition to being connected, the data processing device 50 is also connected to the liquid level detecting means 22 and the temperature detecting means 23 provided on the upper portion of the tank 1.

Of these, the data processing device 50 sets the operating time and the liquid level of the motor in a state where there is no gas leakage from the gas chamber 6a of the accumulator 5 as the standard operating time and the standard liquid level, and determines the standard operating time and the standard liquid level. The liquid level is compared with the operating time of the motor 12 and the liquid level of the tank 1 detected by the detecting means. An indicating device 51 is connected to the data processing device 50, and as a result of the calculation,
When the operating time of the motor 12 detected by the detecting means is longer than the reference operating time and the detected liquid level is lower than the reference liquid level, an alarm is output to the indicating device 51. .

The liquid level detecting means 22 is constituted by a sensor having an ultrasonic oscillating element and a receiving element as an example,
The ultrasonic wave is emitted from the sensor side, and the liquid surface level is detected by the time until the reflected wave from the liquid surface arrives. Further, since the temperature detecting means 23 uses a thermocouple or the like, the accurate liquid level in the tank 1 is obtained by subtracting the change amount of the liquid level due to the temperature change. By inputting the temperature in the tank 1 detected by the temperature detecting means 23 to the data processing device 50 and correcting the detection value by the liquid level detecting means 22, the tank 1
To detect the actual liquid level in the.

The operating time detecting means 40 of the motor 12 is, for example, the second
As shown in the circuit diagram of the figure, the drive motor 12 of the pump unit 3 starts its operation when the pressure in the fluid chamber 6b decreases and the contact 42 of the hydraulic pressure gauge provided in the fluid chamber 6b is turned on. Is. That is, when the contact 42 is turned on, the pressure relay 43a
Is excited, the contact point 43b is turned on, the auxiliary machine contactor coil 44a connected in series to the contact point 43b is excited, and the auxiliary machine contactor contact 44b is turned on. Starts driving. Simultaneously with the start of the operation of the motor 45, the auxiliary contactor contact 44c is turned on by the excitation of the auxiliary contactor 44a, the buffer relay coil 46 connected to the contact 44c is excited, and its contact 47 Is turned on, and the contact signal of the contact 47 is input as the operation start detection signal to the time measuring unit built in the data processing device. On the other hand, when the operation of the motor 12 is stopped, the contact 42 of the pressure gauge that detects the pressure increase in the fluid chamber 6b is turned off, so that the contactor contact 44b for auxiliary machinery is turned off and the motor 1
2 is stopped, and the contact signal of the auxiliary contactor contact 44c is input to the time measuring unit of the data processing device 50 as an operation stop detection signal. Therefore, in the data processing device 50, the operation time of the motor 12 can be detected by comparing and calculating the input times of the operation start detection signal and the operation stop detection signal.

In FIG. 2, reference numeral 49 is a switch for switching the operation of the motor 12 between manual operation and automatic operation, and this switch 49 is turned on when the system of this embodiment is operated.

* Operation of the embodiment In the system of the present embodiment having the above-mentioned configuration, the operation time of the pump 12 required to raise the pressure of the fluid in the fluid chamber 6b to a predetermined pressure and the fluid pressure are predetermined. The liquid level in the tank 1 when the pressure is reached is obtained by the data processing device 50. In the data processing device 50, the operating time and the liquid level of the motor in a state where there is no gas leakage from the gas chamber 6a of the accumulator 5 are set as the standard operating time and the standard liquid level, respectively. In the data processing device 50, the reference operating time and the reference liquid level are compared with the actual motor operating time and the liquid level.

If the amount of gas in the accumulator 5 is reduced due to a leak or the like, the amount of fluid in the fluid chamber 6b of the accumulator 5 is larger than that in a normal state, and thus the operating time of the motor 12 of the pump unit 3 is longer. At the same time, the liquid level in the tank 1 becomes lower than that in the normal state.
Therefore, when the data processing device 50 detects this,
An alarm is issued by the indicating device 51 connected to it.

Other Embodiments The present invention is not limited to the above-described embodiments, and a tacho generator that operates in conjunction with the motor is used as a means for detecting the operating time of the motor, in addition to using the contact signal of the buffer relay contact. You can use the one that uses the output of. Further, as the liquid level detecting means, it is possible to use one that detects a reflected wave of infrared rays, a laser, or the like, or one that is simply provided with a switch interlocking with a float or the like on the inner surface of the tank. Further, the temperature detecting means is not essential to the present invention, and when the change in the liquid surface level due to the temperature change is smaller than the change in the liquid surface level due to the gas leak, it is not necessary to correct the liquid surface level due to the temperature change. Is.

[Effects of the Invention] As shown in the above embodiments, according to the fluid pressure operating device monitoring system for switchgear of the present invention, it is extremely possible to detect the operating time of the motor driving the pump unit and the liquid level in the tank. Since it is possible to monitor the gas leak in the accumulator by a simple means, it is possible to prevent malfunction of the switchgear using this type of liquid pressure control device and prevent serious accidents such as a complete stoppage. There is an effect that can be prevented.

[Brief description of drawings]

FIG. 1 is a piping diagram showing an embodiment of a fluid pressure operating device monitoring system for switchgear according to the present invention, FIG. 2 is a circuit diagram showing an example of motor operating time detecting means in the embodiment of FIG. FIG. 3 is a piping diagram showing an example of a conventional fluid pressure operating device for a switchgear. 1 ... Tank, 2 ... Fluid, 3 ... Pump unit, 4
…… Piping, 5 …… Accumulator, 6 …… Gas, 6a ……
Gas chamber, 6b ... Fluid chamber, 7 ... Piping, 8 ... Driving unit, 9
...... Piping, 10 ...... close valve, 11 ...... trip valve, 12 ...... motor, 14 ...... rod, 15 ...... piston, 16 ...... cylinder,
22 ... Liquid level detecting means, 23 ... Temperature detecting means, 42 ...
… Hydraulic pressure gauge contacts, 44a… Contactor coils for auxiliary machines, 44b, 44c…
… Contactors for auxiliary equipment, 50… Data processing device, 51… Indication device.

Claims (1)

[Claims] 1. A pump unit for transferring a fluid pressure into a tank, and an accumulator for filling a part of the gas with the gas and compressing the gas to compress and store the gas. In a fluid pressure operating device for a switchgear which drives a switchgear by fluid, the pump unit is provided with a pump operating time detecting means, and a tank is provided with an internal fluid surface level detecting means. Connected to a data processing device that compares the detected operating time and fluid level of the pump with preset reference operating time and reference fluid level, and the detected operating time is longer than the standard operating time and the detected fluid level is the standard. An output means connected to the data processing device indicates a gas leak in the accumulator when the fluid level is lower than the fluid level. Fluid pressure operation device monitoring system for opening and closing device being characterized in that as.