JPH058527Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is used in three-phase high-voltage AC power distribution equipment in the installer of private electric facilities, and is a disconnector and zero that turns on and off all three phases at once. The present invention relates to a zero-sequence voltage detection device that integrates a phase voltage detector.

[Conventional technology]

A ground fault relay is installed on the premises of the installer of private electrical facilities or on the indoor power distribution equipment to protect the load and distribution equipment. Whether it is a ground fault accident or a ground fault accident outside the installer's premises,
Since the ground fault relay is activated in either case, a ground fault directional relay is normally used, which is activated only in the event of a ground fault on the installer's premises.

It is possible to distinguish between the direction of occurrence of a ground fault on the installer's premises and outside the premises by detecting the zero-sequence voltage and zero-sequence current of three-phase AC. An example of this is shown in the power receiving system diagram in Figure 6. Shown below. FIG. 6 shows an example in which high-voltage power receiving ground fault direction relays are installed at power receiving points and branch points. Zero-phase voltage detector 1 shown in Fig. 6
The details are shown in the circuit diagram in Figure 4 and the actual wiring diagram in Figure 5, but it is a detector that does not malfunction due to various induced voltages and currents from the outside, has simple operation tests, and has low equipment costs. Yes, the applicant has requested
This was proposed in No. 61-030897. As shown in FIGS. 4 and 5, the three grounding capacitors 5 of the zero-phase voltage detector 1 are each housed in a storage container 7, and each is connected to the three-phase AC high-voltage wiring via a single-pole disconnector 6. has been done. Furthermore, the zero-phase transformer 3 is housed in one of the three housing containers 7. The zero-sequence voltage is obtained from the zero-sequence voltage terminal 4. Note that a description of the detection of zero-sequence current has been omitted.

[Problem that the invention attempts to solve]

The aforementioned zero-sequence voltage detector and unipolar disconnector are generally housed in a cubicle. In the conventional device, three single-pole disconnectors were independently arranged, which caused the following problems.

The disconnector and zero-phase voltage detector are arranged separately, and the disconnector can be turned on or off by hooking a hook rod to the locking part (not shown) of the movable electrode of each single-pole disconnector. , but this operation requires a certain amount of space, so it is necessary to increase the volume of the cubicle.

During maintenance and inspection, it is necessary to turn the disconnector on and off three times each, which takes time and increases the risk.

The purpose of the present invention is to solve the above-mentioned problems, significantly reduce the volume of the cube, and provide a zero-phase voltage detection device that is safe and reliable during maintenance and inspection, and is easy to handle. .

[Means for solving problems]

The present invention solves the above-mentioned problems, and includes built-in grounding capacitors connected to each of the three-phase AC high-voltage distribution lines via single-pole disconnectors in each storage container. It was applied to a zero-sequence voltage detector that integrally houses a zero-sequence transformer for detecting zero-sequence voltage, and the following technical measures were adopted. That is, the movable electrodes of the three single-pole disconnectors were configured to be operated in conjunction with each other, and each movable electrode was configured with a respective storage container of a zero-phase voltage detector.

[Effect]

Since the device of the present invention is configured as described above, the number of times the disconnector is turned on and off can be reduced, and the operation is safe, reliable, and simple during maintenance and inspection.

The disconnector and zero-phase voltage detector are compactly integrated into one, making it possible to reduce the size of the entire device, and since the hook rod can be operated from only one place, the volume of the cubicle can be significantly reduced. It becomes possible.

〔Example〕

1 and 2 show a zero-sequence voltage detection device according to an embodiment of the present invention. Further, FIG. 3 shows a power receiving system diagram using the device of the present invention. The zero-phase voltage detection device 2 of the present invention has each fixed electrode 11 of a disconnector on three resin insulators 13 provided on one side of a mounting frame 12.
is fixedly installed, and one opposing side is constituted by an angle 14 that swings about a shaft 15. Three storage containers 7 for zero-phase voltage detectors are fixedly installed on the angle 14. A flat blade 10 is formed on the head of each movable electrode 16 of the disconnector. Angle 1
4 is configured to swing in conjunction with the operating lever 8, so by operating the operating lever 8, the three disconnectors can be turned on and off at once. i.e. hook rod (not shown)
When hooked into the hole 9 of the operating lever 8 and pulled in the direction of the arrow, each flat blade 10 separates from each fixed electrode 11 and the disconnector is turned off. By performing the reverse operation, the disconnector can be turned on.

Note that each component is connected to a predetermined circuit configuration by wiring, and the zero-phase voltage is output from the terminal 4.

Although the flat blade 10 is used in this embodiment, it is not necessary to limit the blade to a flat blade, and it is of course possible to use a round blade, for example.

[Effect of the invention]

The zero-sequence voltage detection device of the present invention is safe, reliable, and easy to operate during maintenance and inspection.

Since the entire device can be manufactured compactly and there is only one operating location, it is possible to significantly reduce the volume of the cubicle, and equipment costs can also be greatly reduced.

It has excellent effects such as

[Brief explanation of drawings]

1, 2, and 3 are explanatory diagrams of one embodiment of the present invention, in which FIG. 1 shows a front view, FIG. 2 shows a side view, and FIG. 3 shows a power receiving system diagram. Figures 4 and 5
FIG. 6 and FIG. 6 are explanatory diagrams of a conventional example. 1... Zero-phase voltage detector, 2... Zero-phase voltage detection device, 3... Zero-phase transformer, 4... Zero-phase voltage terminal, 5
...Grounding capacitor, 6...Single pole disconnector, 7...
Storage container, 8... Operating lever, 9... Hole, 10...
... Flat blade, 11 ... Fixed electrode, 12 ... Mounting frame, 1
3...Resin insulator, 14...Angle, 15...
Axis, 16...movable electrode.

Claims (1)

[Claim for Utility Model Registration] A grounding capacitor connected to each of the three-phase AC high-voltage distribution lines via a single-pole disconnector is built into each storage container, and zero-sequence voltage is detected in one of the storage containers. In a zero-phase voltage detector integrally housing a zero-phase transformer, the movable electrodes of the three single-pole disconnectors are configured to operate together in conjunction, and each movable electrode is connected to the zero-phase transformer. 1. A zero-sequence voltage detection device comprising storage containers for phase voltage detectors.