JPH0590049A - Transformer for electricity utility meter - Google Patents

Abstract

PURPOSE:To provide a transformer for an electricity utility meter (PCT) which facilitates inspection and replacement of a transformer (PT) and a converter (CT) CONSTITUTION:A PCT 1 is constituted by incorporating a PT 3 and a CT 4 in an internal box 2. The internal box 2 which incorporates the PT 3 and the CT 4 is stored in an outer frame 5 and is vertically removed by a lift 6 provided at the bottom of the outer frame 5. At the top of the PT 3 and the CT 4, a pair of tulip-shaped contacts are provided and at the top of the outer frame 5, a pair of fixing contacts connected with high-pressure cable 15 are arranged. The tulip-shaped contact is permitted to make contact with the fixing contacts and to be removed from the fixing contacts. When the lift 6 is descended and the contacts are released, the PT 3 and the CT 4 can be taken out being integrated in the internal box 2 and inspection and replacement are facilitated.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a power receiving and transforming facility,
A device that transforms high voltage and current into low voltage and small current in order to integrate the electricity usage of the high voltage circuit with a watt hour meter, that is,
Transformer (hereinafter referred to as "PT") and current transformer (hereinafter referred to as "C"
The present invention relates to an improvement of an instrument transformer for power supply and demand (hereinafter referred to as "PCT") in which a "T") is incorporated in a box and an electric meter is connected to the box.

[0002]

2. Description of the Related Art A watt-hour meter is used to detect the amount of power consumed from a high-voltage distribution line. This watt-hour meter is connected to a PCT installed in the middle of the high-voltage distribution line. It is operated by the PCT that has reduced the high voltage and current to the low voltage and small current.

In this conventional PCT, PT and CT are incorporated in one box and directly connected to a high voltage electric wire.

[0004]

By the way, the PCT incorporating the PT and CT needs to be regularly inspected and replaced, but in the case of the conventional PCT, the PT and the CT are directly fixed to the high pressure bushing. Since it is connected to the high-voltage electric wire that is installed and is housed in a narrow space of one box, inspection and replacement are troublesome. In addition, during inspection and replacement work, it was necessary to disconnect the high-voltage power line and put it into a power failure state.

Therefore, according to the present invention, the PT and the CT are incorporated into the inner box to form the PCT, and the PT and the CT incorporated in the inner box are housed in the outer frame and provided on the bottom of the outer frame. The PT and CT can be moved up and down, and a tulip-shaped contact is provided on the upper part of PT and CT, and a fixed contact provided on the upper part of the outer frame by connecting with a high-voltage electric wire
It is an object of the present invention to provide a structure of a PCT in which the PT and the CT can be easily taken out from the outer frame as a unit, and can be easily inspected and replaced, by adopting a configuration in which the PT and the CT can be inserted and removed by the vertical movement.

Further, according to the present invention, by providing a bypass contact for contacting and energizing when the tulip-shaped contact on the upper part of the PT and CT is separated from the fixed contact, the PT and CT are connected in a live state without opening the electric circuit. PC with removable CT, which enables inspection and replacement work in uninterrupted state
It is intended to provide the structure of T.

[0007]

In order to achieve the above object, the PCT of the present invention is constructed by incorporating PT and CT into an inner box. The PT and CT incorporated in the inner box are housed in the outer frame and can be moved up and down by an elevator provided at the bottom of the outer frame. A pair of tulip-shaped contacts are provided on the upper part of PT and CT. On the other hand, a pair of fixed contacts provided in connection with the high-voltage electric wire are arranged on the upper portion of the outer frame. Then, the tulip-shaped contact can be inserted into and removed from the fixed contact by the vertical movement of PT and CT by the operation of the elevator.

Further, the PCT of the present invention comprises an insulating rod standing between a pair of tulip-shaped contacts provided on the upper part of the PCT, and is composed of two spring members provided between a pair of fixed contacts which are normally in contact with each other. An insulating rod is inserted between the bypass contacts by the upward movement of PT and CT to separate the bypass contacts, and PT and C
The PCT of the present invention is characterized in that the bypass contact can be contacted by lowering T.
It is also characterized in that a drawer tray for placing and pulling out the inner box of the storage when the inner box is lowered is provided inside the lower portion of the outer frame.

[0009]

[Operation] According to the present invention, a PT and a CT are incorporated in an inner box to form a PCT, and the PT and CT incorporated in the inner box are housed in an outer frame and provided on the bottom of the outer frame. It is possible to move up and down by using a pair of tulip-shaped contacts on the upper part of PT and CT. Since the PT and CT can be turned on and off by the vertical movement, when the inner box of the PT and CT is lowered by operating the elevator, the tulip-shaped contacts on the upper part of the PT and CT are separated from the fixed contacts, and are separated in this way. After that, by pulling out the inner box of the PT and CT from the outer frame, the PT and CT can be easily taken out from the outer frame as a unit, and the PCT can be easily inspected and replaced.

Further, an insulating rod is erected between the tulip-shaped contacts, and the insulating rod is connected to a bypass contact formed of two spring members which are normally in contact with each other and formed between a pair of fixed contacts. Since the bypass contact can be separated or contacted by inserting or removing by vertical movement, P
In the PCT installation state where T and CT are moved up, P
The tulip-shaped contacts above T and CT are turned into fixed contacts so that current flows only through PT and CT, and an insulating rod is inserted between the bypass contacts to separate them, so that the current flow is interrupted. On the other hand, the tulip-shaped contact on the upper part of PT and CT is separated from the fixed contact and the lower position and PT and C
In the state of taking out T, since there is no insulating rod between the bypass contacts, the bypass contacts come into contact with each other and a current flows there, thereby preventing a power failure of the high voltage electric wire.

Further, an inner tray for storing the PT and CT lowered by the operation of the elevator is placed on the inner circumference of the lower portion of the outer frame, and a drawer tray for pulling out is provided, so that the drawer tray can be pulled out. , PT and CT can be taken out very easily.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail based on an embodiment shown in the drawings.

FIG. 1 is a partially sectional front view showing the overall structure of the PCT, FIG. 2 is a side view showing the overall structure of the PCT, and FIG.
FIG. 4 is an enlarged front view showing the internal structure of the CT, FIG. 4 is an enlarged front view showing the contact structure of the PCT, and FIG. It is a partial cross-section front view which shows the state which released contact.

The PCT 1 is constructed by incorporating PT3 and CT4 in order from the bottom into an inner box 2 having an open upper part. The inner box 2 incorporating these PT3 and CT4 is an outer frame 5
It is housed inside and can be moved up and down by an elevator 6 provided on the bottom portion 5 a of the outer frame 5.

The secondary side connection terminals of PT3 and CT4 constituting the PCT1 are housed in the connection terminal box 7 on the side surface of the outer frame 5 (see FIG. 2), to which an electric energy meter (not shown) is connected.
The electric energy meter is operated by the voltage reduced by PT3 and the current reduced by CT4.

A pair of tulip-shaped contacts 9 are provided on the upper portion of CT4 via a contact fixing base 8 (see FIG. 4). The contact fixing base 8 is directly connected to CT4 and
It is also connected to PT3 via the connection line 10. Also,
The pair of tulip-shaped contacts 9 are surrounded by a separation contact 11 attached to the contact fixing base 8 so as to cover the tulip-shaped contacts 9 with a predetermined interval, and a bypass described later is provided between the pair of tulip-shaped contacts 9. An insulating rod 12 for opening and closing the contact 21 is provided upright.

On the other hand, a terminal fixing base 13 made of epoxy resin or the like is provided on the upper portion of the outer frame 5, and a high voltage (primary side) is provided there.
A terminal 16 of a high-voltage (primary side) electric wire 15 fixed to the bushing 14 and drawn into the outer frame 5 is fixed, and a pair of rod-shaped fixed contacts 17 is provided at the tip thereof. 1
8 is a terminal cover for the high voltage terminal 16, 19 is a terminal fixing base 13
The insulating cover of FIG. 2 is provided with a protective barrier 20 at the time of disconnecting the contacts 9 and 17 at the disengaged positions of the contacts 9 and 17, as required.

Between the pair of fixed contacts 17, there are provided bypass contacts 21 made of two spring members, which are normally in contact with each other, connected to the pair of fixed contacts 17, respectively.
The insulating rod 12 is inserted by the upward movement of the inner box 2 of CT1 to separate the bypass contact 21, and the lower contact of the inner box 2 of the PCT 1 allows the bypass contact 21 to come into contact.

Inside the lower portion of the outer frame 5, the slide rail 2 is provided.
2 is provided with a drawer tray 23 in which the leg portions 23b can be freely drawn out through a means such as a ball bearing,
The drawer tray 23 can be pulled out in both front and rear directions, and when the elevator 6 is at the lowest position, the elevator 6
It is located slightly above the top edge of the. The drawer tray 23 is formed with an opening 23a that allows the elevator 6 to move up and down.
The upper end of the PCT mounts the inner box 2 of the PCT 1 and moves up and down. Therefore, when the inner box 2 of the PCT 1 is placed and the elevator 6 is lowered to the lowest level, the bottom surface 2a of the inner box 2 is placed on the drawer tray 23, and the placed state on the elevator 6 is released.

In this embodiment, a hook piece 6a is provided on the upper portion of the elevator 6, and the hook piece 6a is inserted into the insertion hole 2b provided on the lower surface of the inner box bottom portion 2a while keeping the locked state. The inner box 2 is placed. Therefore, the inner box 2 accommodating PT3 and CT4 is reliably moved up and down by operating the elevator 6. And this hook piece 6a
When the inner box 2 is placed on the drawer tray 23 and pulled out from the outer frame 5, the inner box 2 is pulled out from the insertion hole 2b and the locked state is released.

Further, the elevator 6 used in this embodiment is conventionally known, and a handle insertion opening is provided on the lower side surface of the outer frame 5 from which a rotating operation is performed by an operation handle or the like to move up and down. A rotation prevention cover 24 is screwed to the handle insertion port, and the cover 24 is removed when the operation is performed.

Next, the operation of this embodiment will be described. First,
In the attached state of the PCT 1, as shown in FIG. 1 and the like, the inner box 2 in which PT3 and CT4 are respectively installed is placed by the elevator 6 which is moved upward, and the pair of tulip-shaped contacts 9 on the upper part of PT3 and CT4. While being inserted into the pair of fixed contacts 17 at the tip of the connection terminal 16 of the high-voltage electric wire 15,
The insulating rod 12 provided between the pair of tulip-shaped contacts 9 is inserted between the bypass contacts 21 provided between the pair of fixed contacts 17 to separate the bypass contacts 21. Therefore, in this state, the high voltage from the primary side terminal 16
An electric current flows through PT3 and CT4, where it is reduced to a low voltage and small current and sent to the watt-hour meter from the secondary side terminal to operate it.

When the PCT 1 is to be inspected and replaced, as shown in FIG. 5, the rotation preventing cover 24 is removed and the elevator 6 is moved downward with the handle, and the PT3 and CT4 placed on it. Is lowered together with the inner box 2. As a result, the tulip-shaped contact 9 is separated from the fixed contact 17,
At the same time, the insulating rod 12 separates from the bypass contact 21 to bring the bypass contact 21 into contact, so that the current is PT3 and CT.
It does not flow to the 4 side, but to the bypass contact 21 side. Therefore, even if the connection state of PT3 and CT4 is released, no power failure will occur.

Further, if the elevator 6 is lowered to the maximum,
The bottom surface 2a of the inner box 2 is placed on the drawer tray 23, and the placed state of the inner box 2 on the elevator 6 is released. Therefore, when the drawer tray 23 is pulled out from this state, the inside of the placed inner box 2 is removed. The stored PT3 and CT4 can be pulled out at the same time. As a result, PT3 and CT4 can be attached / detached in a live state without opening the electric circuit, and inspection / inspection of PCT1 can be performed.
Replacement is extremely easy.

[0025]

As described above, according to the present invention, the PT and CT are incorporated into the inner box to form the PCT, and the PT and CT incorporated in the inner box are housed in the outer frame and the outer frame thereof. And a pair of fixed contacts provided by connecting the tulip-shaped contacts to the upper part of the outer frame by connecting them to a high-voltage circuit. Since it is possible to insert and remove by moving the PT and CT up and down by operating the elevator, when the inner box of the PCT is lowered by operating the elevator, the tulip-shaped contact on the upper part of the PCT can be separated from the fixed contact. If the inner box of the PCT is pulled out from the outer frame after being detached in this way, the PT and CT can be easily taken out from the outer frame as a unit, and the PCT can be easily inspected and replaced.

Further, an insulating rod is erected between the tulip-shaped contacts, and the insulating rod is connected to a bypass contact formed of a pair of spring members which is normally in contact with each other and formed between a pair of fixed contacts. Since the bypass contact can be separated or contacted by inserting or separating by vertical movement, current flows only in PT and CT at the upper position where the tulip type contact on the upper part of the PCT is turned on to the fixed contact, and the bypass contact is Insulation rods are inserted and separated from each other, so that the flow of current is interrupted. On the other hand, the tulip-shaped contact on the upper part of the PCT is separated from the fixed contact at the lower position and PT and C.
When T is taken out, there is no insulating rod between the bypass contacts, so that the bypass contacts come into contact with each other and a current flows therethrough, thereby preventing a power failure in the high voltage circuit.

Further, since the inner box of the PCT lowered by the operation of the elevator is placed on the inner circumference of the lower portion of the outer frame, and the drawer tray for pulling out is provided, it is extremely easy to take out PT and CT. is there.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing the overall structure of a PCT.

FIG. 2 is a side view showing the overall structure of a PCT.

FIG. 3 is an enlarged front view of the internal structure of the PCT.

FIG. 4 is an enlarged front view showing a contact structure of a PCT.

FIG. 5 is a partial cross-sectional front view of the PCT showing a state in which the tulip-shaped contact and the fixed contact are released by lowering the elevator and lowering the inner box containing PT and CT.

[Explanation of symbols]

 1 Power supply and demand instrument transformer (PCT) 2 Inner box 3 Transformer (PT) 4 Current transformer (CT) 5 Outer frame 6 Elevator 7 Secondary side connection terminal box 8 Contact fixing base 9 Tulip type contact 10 Connection line 11 Disconnection contact 12 Insulation rod 13 Terminal fixing base 14 High voltage (primary side) bushing 15 High voltage (primary side) electric wire 16 High voltage (primary side) electric wire terminal 17 Fixed contact 18 Terminal cover for high voltage terminal 16 19 Terminal fixing base 13 Insulation cover 20 Protection barrier for disconnecting contacts 21 Bypass contact 22 Slide rail 23 Drawer tray 24 Rotation prevention cover

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 591234444 Hokkaido Keiki Kogyo Co., Ltd. 17-5-13 Kita 5jo Nishi, Chuo-ku, Sapporo-shi, Hokkaido (72) Inventor Isamu Sasaki 1-2-2 Odori-higashi, Chuo-ku, Sapporo, Hokkaido Hokkaido Electric Power Company Sapporo Sales Office (72) Inventor Kamo Kamo 52-1 Ebara, Shinagawa-ku, Tokyo Inside Saneisha Co., Ltd. (72) Inventor Kimitoshi Ishii 5-2-1 Ebara, Shinagawa-ku, Tokyo No. Stock Company Saneisha Works (72) Inventor Masanosuke Nakazato 9-19-10 Minami 19 Nishi, Chuo-ku, Sapporo-shi, Hokkaido Yasu Electric Co., Ltd.

Claims (3)

[Claims] 1. A transformer for a power supply and demand instrument is constructed by incorporating a transformer and a current transformer into an inner box, and the inner box for storing the transformer and the current transformer is housed in an outer frame and the outside thereof is provided. It can be moved up and down by an elevator provided at the bottom of the frame, and a pair of tulip-shaped contacts is provided on the top of the transformer and current transformer, and these tulip-shaped contacts are operated by the elevator to transform the transformer and current transformer. A transformer for a power supply and demand meter, characterized in that it can be turned on and off by a pair of fixed contacts provided by connecting the high voltage wire to the upper part of the outer frame by vertical movement of. 2. An insulating rod is erected between a pair of tulip-shaped contacts provided on the upper part of a transformer and a current transformer constructed by being assembled in an inner box, while the pair of fixed contacts are always in contact with each other. By forming a bypass contact consisting of two spring materials, the insulation rod is inserted between the bypass contacts by the upward movement of the transformer and the current transformer, and the bypass contacts can be separated, and by the descending of the transformer and the current transformer. The transformer for an electric power supply and demand meter according to claim 1, wherein the insulating rod is moved downward so that the bypass contact can be contacted. 3. A drawer tray is provided inside the lower portion of the outer frame for mounting and pulling out the inner box for storing the transformer and the current transformer, which are lowered by the operation of the elevator. Item 1 or 2 power supply and demand instrument transformer.