JPS5856922B2 - disconnector - Google Patents

Description

[Detailed description of the invention] The present invention relates to a disconnector with an air blowing device.

As is well known, disconnectors are generally used to open and close unloaded circuits, but under certain conditions they are also required to open and close in the following cases.

That is, this applies to switching of relatively small currents, such as no-load current of one transformer, charging current of two lines or bus bars and their associated insulators, and loop currents of three lines or equipment.

Even in the case of these small currents, arcing occurs when the circuit is cut off by a disconnector.

For this reason, in order to improve the shutoff ability, a means is taken to blow air toward the shutoff section during shutoff.

Figures 1A, B and 2A, B, and C are disconnectors equipped with a conventional air blowing device.From Figures 1A and B, the line within the dashed line in the figure is the disconnector body. , a rotatable insulator 1 is provided at the center, and fixed support insulators 2 and 3 are provided at both ends.

4 is a pressure accumulation tank for air blowing, and air is supplied to this tank 4 from, for example, a compressed air generator (not shown) provided in the substation equipment.

Air in the tank 4 is supplied to an air pipe 5 via a control box 6.

The air supply lower part of the air supply pipe 5 is provided below the fixed support insulators 2 and 3.

In the disconnect switch with air blowing device shown in FIGS. 1A and B, when operating the rotary insulator 1, air is supplied from the tank 4 to the air supply pipe 5, and the air is blown from the air supply lower toward the current interrupting part. Measures are taken to cut off the current.

The disconnectors shown in FIGS. 1A and 1B require an expensive tank 4, occupy a large area, and have disadvantages in that an air pipe 5 must be provided.

Next, to discuss Fig. 2 A, B, and C, Fig. 1 A, B
The same parts are indicated with the same reference numerals.

In FIGS. 2A, B, and C, a large floor 8 is provided in place of the pressure accumulating tank, and the air pipe 5 is connected to the air outlet of the blower 8.

In the cases of A, B, and C in FIG. 2, when operating the rotary operation insulator 1, the floor 8 is operated, air is supplied to the air pipe 5, and the air is directed from the air supply lower toward the current cutoff section. is sprayed to cut off the current.

This Figure 2A. B and C also use a large blower 8, which has the drawback of being expensive, requiring a large occupied area, and requiring an air supply pipe 5.

As mentioned above, in addition to the above-mentioned drawbacks of the conventional disconnect switch with an air blowing device, in the case of FIGS. ,
Since the air necessary for cutting off the current is not blown from the air supply lower, there is also the drawback that operation cannot be performed until a predetermined pressure is reached.

Also, Figure 2A. In the case of B and C, if the disconnect switch is operated only because the floor 8 has operated, the floor 8 may not supply the specified amount of air to the air pipe 5, so it is necessary to cut off the current from the air supply lower. The disadvantage is that the necessary air is not blown.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a disconnector with an air blowing device that can reliably cut off current even though the air blowing device is made smaller.

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

3A, B, and C are a plan view, a front view button, and a side view. Referring to FIG. 33a to 33c are fixed support insulators for each phase.

The rotation operation button and fixed support insulators 31a to 31c, 32
a~32c.

33a to 33c are arranged in a straight line, and rotatable insulators 31a to 31c are arranged in the center and attached to the base 40.

34a to 34c are movable blades, and this movable blade 3
4a to 34c are fixed to the upper portions of the rotatable insulators 31a to 31c.

35a to 35c and 36a to 36c are fixed contactors,
These fixed contactors 35a to 35c and 36a to 36c
are fixed to the upper portions of the fixed support insulators 32a to 32c and 33a to 33c.

37a to 37c are small air blowers, and these air blowers 37a to 37c are fixed support insulators 32a to 32c.
The air blowers 37a to 37
The air outlet c is arranged substantially parallel to the fixed support insulators 32a to 32c and is directed toward the current interrupting portion.

38 is an operating iron, and this operating iron 38 is connected to the rotary operating insulators 31a to 31cK.

This operating iron 38 is connected to an operating device (not shown).

39 is a terminal connected to the line, and 41 is a relay, which is activated by an electric signal from a flow rate detector to be described later.

FIG. 4 and FIG. 5 show different embodiments of the flow rate detector 42, and in particular, the button in both figures shows the air blower 37a.
I will only talk about it.

In FIG. 4, a nozzle 44 is fitted into the air outlet 43 of the air blower 37a, and a flow rate detector 42 is attached.

The flow rate detector 42 shown in FIG. 4 is arranged at the air outlet 43 so that the sensor portion 42a is perpendicular to the air flow, and is configured to send out an electrical signal when the flow rate exceeds a predetermined value.

Further, the flow rate detector 42 shown in FIG. 5 is arranged at the air outlet 4 with the sensor portion 42b bent so as to face the air flow, and similarly to the above, it sends out an electric signal when the flow rate exceeds a predetermined value.

The flow rate detector 42 operates when the air blower 37a operates and supplies an amount of air exceeding a predetermined value to the air outlet 43, an electrical signal is applied to the relay 41, the relay 41 operates, and a disconnector operation control circuit (not shown) is activated. Enable control operations.

Next, the operation of the embodiment shown in FIGS. 3A, B, and C will be described.

First, the disconnector is opened by an operating device (not shown), which is driven by a command signal from a disconnector operation control circuit.

Before the disconnector starts the opening operation, the air blower 37a~
If 37c is working properly, air blower 37a
An air stream is blown from the nozzle 44 of ~37c toward the current interrupting part.

If the air blowers 37a to 37C are operating in this manner and the output of the flow rate detector 42 is being generated, the relay 41 is operated.

Then, a command signal is generated from the disconnector operation control circuit, and the operating device becomes ready to be driven.

When the operating device is driven, the rotary operating insulators 31a to 31c
is rotated counterclockwise.

Therefore, the movable blades 34a to 34c also rotate counterclockwise and are separated (as indicated by the dashed line in FIG. 3).

At this time of separation, fixed contactors 35a to 35c, 36a to 36
An arc is generated between the movable blades 34a and 34c.

However, the fixed contactors 35a to 35c and the movable blade 34a
Since the arc between 34c and 34c has already been blown with an air stream from below, the arc is immediately blown out by this air stream and the current is cut off.

In this way, in the above embodiment, the small air blower 37
a to 37c are installed on the fixed support insulators 32a to 32a, and the opening operation is performed after confirming that the air blowers 37a to 37c are reliably blowing air from the nozzle 45, so that current can be cut off reliably. Moreover, it has the advantage that it does not require the installation of an air pipe or the like, unlike the conventional method.

Figure 6 A, B, and C are insulators 33 that fix and support the air blower.
Also arranged near the movable blades 34a to 33c,
34c and the fixed contactors 36a to 36b, in which current is cut off by so-called two-point blowing, the same parts as in FIGS. 3A, B, and C are designated by the same reference numerals.

Figure 6 A, B, CK$ - Air blower 45a~
45c is fixed near the fixed supporting insulators 33a to 33c by the same mounting means as the air floors 37a to 37c, and a flow rate detector 42 is also provided.

The following table shows the results of a test of current interrupting ability by installing air blowers 37a to 37c and 45a to 45C at two locations as shown in FIG. 6A, B, and C.

In this table, in the case of one-point spraying (Fig. 3A).

Examples B and C) When the air volume is 1.8771'', the cutoff current is about 1.5A, but when the airflow is doubled to 3.6m', the cutoff current becomes about 3A.

On the other hand, in the case of two-point spraying (the embodiments shown in FIGS. 6A, B, and C), the current can be cut off at about 4 A1 even though the air volume is 1.8 m'.

That is, the breaking current is approximately three times as large, and the arc extinguishing effect is greatly improved.

This is because two-point spraying improves the arc cooling efficiency, and the spraying stretches the arc and lengthens the arc path.

In addition, in the case of two-point blowing, even if one of the blowers fails, it can be cut off by blowing at one point, which further improves the reliability of the cut-off.

Another advantage is that small floors with different air volumes can be arbitrarily selected depending on the required breaking current.

As described above, according to the present invention, a separate blower body is provided near the lower part of the fixed support insulator, so installation for arc blowing can be done easily. The installation area is approximately the same as the area of the main body of the disconnector.

Further, the number of blower bodies can be easily increased or decreased according to the cutoff current, and the occupied area does not increase.

Furthermore, compared to conventional equipment, the present invention is extremely low cost.

Furthermore, since the blower main body is activated before the circuit is opened and is equipped with a flow rate detector, air can be reliably blown toward the cutoff section, and the circuit can be reliably opened after blowing out.

In addition to the above, each blower body has its own air blowing function, so there is no need for a tank or piping, only wiring is required, and miniaturization is possible.

Another advantage is that the blower itself only needs to be operated when necessary.

[Brief explanation of drawings]

1A, B and 2A, B, and C are a front view, a side view, and a plan view of a conventional example, and FIG. 3A is a front view, a side view, and a plan view of a conventional example. B and C are a plan view, a front view, and a side view showing one embodiment of the present invention, FIGS. 4 and 5 are a partially sectional front view showing the mounting position of the flow rate detector, and FIG. A, B, and C are a plan view, a front view, and a side view showing other embodiments of the present invention. 31a-31c...Rotary operation insulator, 32a-32c
, 33a-33c... Fixed support insulator, 34a-34c
...Movable blade, 35a-35c, 36a-36c
...Fixed contactor, 37a-37c...Air blower, 38...Operation terminal, 39...Terminal, 40...
- Base, 41... Relay 42... Flow rate detector.

Claims (1)

[Scope of Claims] 1- A two-point disconnector in which a rotary operation insulator is arranged in the center of a pair of fixed support insulators, which are arranged spaced apart from each other by a predetermined distance on a straight line, at least one of the fixed support insulators. A blower main body is arranged near the bottom of the main body so that the air outlet faces the current interrupting part, and the blower main body is opened by a command signal for driving the operating device of the rotary operating insulator sent from the disconnector operating control circuit. A disconnector characterized in that the disconnector is previously activated. 2- In a two-point disconnector which is arranged spaced apart from each other by a predetermined distance on a straight line, and in which a rotationally operated insulator is arranged in the center of a pair of fixed support insulators, an air outlet is provided in the lower part of at least one of the fixed support insulators. A blower main body is arranged so that the main body faces the current interrupting part, and the blower main body is set in an operating state before the circuit is opened by a command signal for driving a rotary operation insulator operating device sent from a disconnector operation control circuit. In addition to doing so,
The blower body is provided with a flow rate detector, and a control circuit is provided that detects that a predetermined amount of air or more is being sent out from the air outlet when the circuit is open, and sends out a shutoff command based on the detected output. disconnect switch.