JPS6011409B2 - Hydraulic operating mechanism for disconnectors and switches - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic operating mechanism for driving movable contacts of breakers and switches. The location has been improved.

In recent years, as the demand for electric power has increased, there has been a demand for high-voltage, large-capacity, and high-speed circuit breakers. Increasing the voltage and capacity and increasing the speed are contradictory, and a powerful operating mechanism is required.The operating mechanism is also becoming larger, and it is necessary to efficiently transmit the drive energy of the operating mechanism. Also, in the case of 4. capacitors and disconnectors, efficient transmission of drive energy and miniaturization of the operating mechanism are essential for downsizing the equipment. FIGS. 1 and 2 show different examples of conventional shear breakers in which a plurality of movable contacts are driven by one hydraulic cylinder, and their hydraulic operating machines.

FIG. 1 shows a hydraulic operating mechanism arranged at the end, in which drive energy is transmitted to the movable contact 17 via the drive piston 1, piston rod 14, release bar 12, inner lever 13, operating rod 15, and lever 16. It was designed so that In FIG. 1, 2 is a hydraulic cylinder, 3 is a control valve block, 4 is a cage pressure device, 5 is a closing control valve, 6 is a tripping control valve, 7 is a low pressure tank, and 8 is an oil pump. Also 18
The fixed contact of the chopper and disconnector, 19 is an arc extinguishing chamber. Also,
In FIG. 2, a hydraulic operating mechanism is arranged between a plurality of movable contacts, and is operated by a piston rod 14 and a rod 20 connected to this via a direction changing lever 21, via an operating rod 15, etc. It operates a movable contact (not shown in FIG. 2). In FIG. 2, parts that are the same as or corresponding to those in FIG. 1 are given the same reference numerals as in FIG. 1, and a description thereof will be omitted. The conventional method mentioned above is. As the capacity of the disconnector becomes larger, the piston rod 14 and the rod 20 become longer, which increases the weight of the movable parts and makes it difficult to efficiently transmit driving force.

This invention was made in view of the above-mentioned circumstances, and aims to provide a hydraulic operating mechanism that can reduce the weight of movable parts and efficiently transmit driving force.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 3 and 4 show longitudinal sections of a shredder breaker according to an embodiment in a closed state and a tripped state.

As shown in FIGS. 3 and 4, this hydraulic operating mechanism has a control valve block 3 disposed below in parallel with a hydraulic cylinder 2,
Piston rods 14a and 14b are integrally connected to both sides of the drive piston 1 which is iron-coupled to the cylinder 2, and protrude from both sides of the hydraulic cylinder 2. Also, the dimensions of the drive piston 1 and piston rods 14a and 14b are d2<
A large-diameter piston rod 1 designed so that
The drive piston 1 is constantly supplied with high-pressure oil from the cage pressure device 4 to the oil-filled chamber A on the 4b side, and high-pressure oil is supplied to and drained from the oil-filled chamber B on the small-diameter piston rod 14a side. is configured to be operated. In addition, Figure 3,
In Fig. 4, 5 is a control valve for immersion, 6 is a control valve for tripping, and 7 is a control valve for tripping.
1 is a low pressure tank, 8 is an oil pump, which are substantially the same as conventional ones, and 9, 10, and 11' indicate packings, respectively. When the tripping control valve 6 is also issued with a tripping command in the closed state shown in FIG.

When the pressure in the oil filling chamber B becomes low, the drive piston 1 moves to the left due to the change in the pressure receiving areas of the oil filling chambers A and B, resulting in a gap or disconnection as shown in Fig. 4. Becomes disconnected.

Further, when a closing command is input to the closing control valve 5 in the damped state shown in FIG. 4, high pressure oil is supplied from the pressure accumulator 4 to the cylinder chamber B.

When oil chambers A and B are filled with high pressure oil,... The difference between the pressure-receiving areas of these chambers A and B is 2 d≧), and the drive piston is placed in the right-hand state as shown in FIG. 3.

5 and 6 show different embodiments of the invention.

FIG. 5 shows the hydraulic operating mechanism shown in FIG. 3 and FIG. The rods 14a and 14b are directly connected to the outer levers 12 and 12.

Therefore, compared to the conventional type described above, the structure can be simplified and the weight of the movable parts can be reduced. FIG. 6 shows an example in which the hydraulic operating mechanism shown in FIGS. 3 and 4 is arranged between the phases of a three-phase switch and a disconnector, and substantially the same effect as that shown in FIG. 5 can be obtained.

In FIGS. 5 and 6, the same or equivalent parts as in FIGS. 1 and 2 are given the same reference numerals, and the explanation thereof will be omitted.

Further, the present invention can be implemented in substantially the same way in a mechanism having a plurality of movable parts, such as a switch.

As explained above, the present invention takes out piston rods with different diameters from both sides of a hydraulic cylinder, operatively connects them to the movable part of the shatter breaker, and also fills the oil chamber on the side of the large diameter piston rod. By communicating the oil filling chamber on the small-diameter piston rod side directly to the pressure accumulator via the input control valve, the drive piston can be configured very easily without the need for a complex hydraulic circuit. This enables efficient transmission of drive energy and miniaturization.

[Brief explanation of the drawing]

FIGS. 1 and 2 are partially cutaway front views showing different examples of a conventional cutter equipped with a hydraulic operating mechanism, and FIGS. 3 and 4 are one embodiment of the present invention. Vertical sectional view of the hydraulic operating mechanism in the closing state and the tripping state according to an example, No. 5
6 are partially cutaway front views showing different examples of the shingle cutter according to one embodiment of the present invention. 1... Drive piston, 2... Hydraulic cylinder, 3
...... Control valve block, 4... Pressure accumulator, 5.
・... Control valve for closing, 6... Control valve for tripping,
7...Low pressure tank, 8...Oil pump, 9,
10, 11...Packing, 12...Removal bar, 1
3... Inner lever, 14, 14a, 14b... Piston rod (drive shaft), 15... Operating rod, 1
6... Lever, 17... Movable contact, 18...
Fixed contact, 19... arc extinguishing chamber, 20... rod, 21... direction conversion rod. Note that the same reference numerals in the figures indicate the same or corresponding parts. No. 1,
Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A drive piston disposed within a hydraulic cylinder, and piston rods 14a, 14b with different diameters extending from both end surfaces of the drive piston and operatively connected to a plurality of movable parts.
and a pressure accumulator 4 which is communicated with the oil filling chamber A on the side of the large diameter piston rod 14b and communicated with the oil filling chamber B on the side of the small diameter piston rod 14a via a closing control valve 5;
A hydraulic operating mechanism for a breaker and a switch, which includes a low pressure tank 7 communicating with the oil filling chamber B via a trip control valve 6.