JPH049652A - Gas leakage monitoring system for automatic gas switch - Google Patents

Abstract

PURPOSE:To make it possible to detect gas leakage on many places within a short period by returning a relay state due to a contact signal from a pressure switch stored in an automatic gas switch to a master station. CONSTITUTION:Even when a manipulation handle MHS is turned to the OFF side by a circuit consisting of an (a) contact AX-2 and a (b) contact BX-2 in an auxiliary relays of the handle MHS, the main contact M of the automatic gas switch 1 is not turned from its closed state to an opened state. When gas pressure exceeds a normal value, the (a) contact BX-1 is closed by a circuit consisting of a pressure switch contact PS to be closed when the gas pressure is more than the normal value and opened in the case of the gas pressure less than the normal value and an auxiliary relay BX, and when the gas pressure is less than the normal value, opened by said circuit, so that information indicating whether the gas pressure is in the normal level or not can be extracted to the outside. When the master station in a remote monitoring equipment transmits a gas leakage check signal to a selected slave station according to the need and the state of the (a) contact BX-1 is returned to the master station, gas leakage in all of many switches can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas leak monitoring system for a large number of automatic gas switches installed on a power distribution line.

[Conventional method]

As shown in FIG. 3, there is a method for determining gas leakage when gas pressure drops in a conventional automatic gas switch.

In FIG. 3, a bellows 5 for detecting the pressure level is attached to the gas-filled case 13 of the automatic gas switch, which is filled with S Fa gas pressure at a normal value. A bellows rod 6 attached to the bellows 5 resists the spring 7 and catches the shaft 8 which is receiving a force resisting the repulsion spring 9. The shaft 8 blocks the gas pressure drop display plate 11 which has a rotational force due to the torsion panel 10, and the gas pressure drop display plate 11 is hidden behind the blind plate 12.

Here, SF, when the gas pressure decreases to below the normal value, the bellows rod 6 attached to the moving bellows 5 moves according to the gas pressure by the force of the modoshi spring 7 in an upward direction as shown by the arrow. , the shaft 8 is unlatched, and the shaft 8 moves to the left as shown by the arrow by the force of the repulsion spring 9.

The gas pressure drop display plate 11 is no longer blocked by the shaft 8, rotates, and comes to appear from the blind plate 12. In this manner, gas leakage is determined once when the gas pressure drops.

[Problem that the invention attempts to solve]

By the way, with the conventional technology, a large number of automatic gas switches are mounted on poles, and gas leaks from the automatic gas switches cannot be confirmed unless one goes to the site for each automatic gas switch. It takes time. 1 [Measures to solve the problem] A pressure switch is installed in the automatic gas switch that closes the circuit when the gas pressure is above the normal value and opens the circuit in the L novel with the normal position F to solve the problem yA above.・One contact PS is provided, and the contact signal is taken into the slave station I, which drives the relay and detects the gas pressure state.

On the other hand, the master station of the remote monitoring and control device selects the address of the corresponding slave station, and sends the status of the relay of the selected slave station back to the master station, thereby controlling each automatic gas muffler. This is used to determine gas leaks.

〔Example] Below is the dud i! 11 specific examples will be explained in detail.

FIG. 1 is a general configuration diagram showing the main parts of an automatic gas switch and a slave station (A).

The slave station 2 is supplied with an AC operating power supply from the distribution line power supply side L, -1 via an operating transformer 3. The AC operating power source can be turned off by the operating handle MHS, and the DC operating power source is obtained through a circuit consisting of a rectifier circuit Y), a resistor R, and a capacitor +l'C. In the DC operation power supply, by controlling the A contact Kl of the closing command of the configured circuit and the 1) contact 2 of the switching command, SF 6 gas is sealed (5, when the gas pressure is at the normal level) The automatic gas switch 1 has a pressure switch contact 1) S that is closed and opens when the level is below the normal value. The main contact M is connected between the power supply side of the power supply side, -1 and the load side of the distribution line 1-2 between the main contact point M and the power supply side HC.
A circuit is constructed that takes into account fail-safe operation when the gas pressure is low.

Taking the pressure switch contact PS into the slave station 2 as a contact signal and configuring a circuit between it and the auxiliary relay coil BX,
Connect to AC operating power supply. Further, it is assumed that contact B X-1 of auxiliary relay B Furthermore, a of the auxiliary relay AX bypasses both ends of the operation handle MH3.
A circuit consisting of contact AX2 and b contact BX~2 of auxiliary relay BX is provided, and the gas pressure is at a level above the normal value.
That is, when the pressure switch contact PS is closed and the main contact M is open, AC operating power is supplied to the control device 2 from the C1 distribution line side L-1 via the operating transformer 3.

The AC operating power source is obtained by setting the operating handle MHS to the inlet side, and using the rectifier circuit L), resistor R, and capacitor C to obtain the DC operating power source. When the DC operation power source is opened at the closing command ag point, the holding coil CO1 and the holding coil HC form a closed loop, and the a contact BX-3 of the closing coil CC1 and the auxiliary relay BX are switched. A closing circuit forming a closed loop is created between the command contact and 2, and the closing fill 0 [; is energized and closes the main contact M, y], and as a result, the divided distribution line power supply side L-1 and Electrically connect the distribution line power supply side L-"'-2. Set the turning-on time of the coil to 0.5 to 1.5 seconds 5,
When that time has elapsed, the 2-i open circuit is established at the b contact of the switching command.

As a result, the closed loop of the input I path is broken, but the main contact M is kept closed by the holding circuit. When the gas pressure is normal and the main contact M is closed, even if the gas pressure falls below the normal value and the pressure switch 7 contact PS opens, the closing command a contact Kl will not close. The holding circuit by the coil CC1 holding-coil HC continues in a closed loop 42, and the main contact M maintains the closed circuit state. However, when the contact M is open, if the gas pressure reaches the level of the normal setting F and the pressure switch contact ps becomes open, 1 is closed to the a contact of the closing command. Even if the closing coil CC1 auxiliary relay BX a contact B
-3, the closing circuit with 2 at the B contact of the switching command does not create a closed loop, while the closing circuit with 1 and 2 at the A contact of the closing command, closing 1 Ile C (
:, the holding circuit formed by the holding coil HC forms a closed loop, but does not close the main contact M.

Auxiliary IJ-ray A that bypasses both ends of the operating handle MH3, (A contact AX-2, auxiliary IJ-ray BX
The circuit consisting of the B contact BX-2 allows the automatic gas switch 1 to have a fail-safe function in which the main contact M does not open from the closed state even if the main contact M of the automatic gas switch 1 is operated to the off side by the operation) 1 handle MH3. .

A circuit is constructed between the pressure switch contact PS and the auxiliary relay BX that closes when the gas pressure is above the normal value and opens when the gas pressure is below the normal value. Auxiliary relay BX at a level higher than the value
A contact BX-1 is closed, and when the gas pressure is at a level below the normal value, contact BX-1 of the auxiliary relay BX is opened, and information on whether the gas pressure is at the normal value level is taken out to the outside. I can do it. On the other hand, FIG. 2 shows the main parts of the configuration of a master station and a slave station of the remote monitoring and control device.

Select the address of the corresponding slave station from the master station of the remote monitoring and control device, send and borrow the gas leak check signal to the selected slave station as necessary, and send the auxiliary IJ l, /-BX a.
M: State of point Bχ, -1 By returning 1.7, gas leakage from each automatic gas switch can be detected.

〔Effect of the invention〕

As described above, according to the present invention, the gas pressure information in the slave station 1 can be transmitted by the master station of the remote monitoring and control device in a short period of time without having to go to the site where the automatic gas switch is installed. Moreover, it has the effect of detecting gas leaks from all of a large number of automatic gas switches.

[Brief explanation of the drawing]

1 and 2 are general configuration diagrams showing a specific embodiment of the present invention, and FIG. 3 is a pressure drop detection display section showing a conventional specific embodiment. AX, BX... Auxiliary U-ray coil AX-1~2
．． BX~1~3... Auxiliary relay contact C... Capacitor CC... Closing coil D... Rectifier circuit HC... 1 for holding coil... 2 for closing command contact... Switching command contact L----1... Distribution line power supply side L-2... Distribution line load side M... Main contact MH3-... Operation handle M
X...Main contact Auxiliary contact PS...Pressure switch contact R...Resistor 1...Automatic gas switch 2
... Slave station 3 ... Operation transformer 4 ...
Master station Figure 1 Figure 2

Claims (1)

[Claims] In a remote monitoring and control device that is equipped with multiple SF_6 gas switches, a slave station that opens and closes the gas switches, and a master station that instructs the slave stations to open and close, the gas pressure level of the automatic gas switch Based on the contact signal of the pressure switch that detects gas pressure, the master station of the remote monitoring and control device sends a gas leak check signal as necessary to the slave station that has received the gas pressure status signal, and the gas leak check signal of the automatic gas switch is A gas leak monitoring system for automatic gas switches, which is characterized by being able to detect leaks by returning them from a slave station.