JPH03198311A - Transformer for instrument - Google Patents

Abstract

PURPOSE:To do conversion work without power stoppage and safely in a short time by separably constituting a transformer body, which has a transformer for instrument and a current transforming path for instrument, and a terminal panel body, which is provided with a power source terminal, a load terminal, a secondary terminal, and a short-circuit switch. CONSTITUTION:When a transformer body A, having a transformer PT for instrument and a current transformer CT for instrument, is shifted into the box 3 of a terminal panel body B with the wheel 6a put on the rails 6a drawn out from inside the box 3 of a terminal body B, the transformer body A is inserted in the box 3 in the condition that the contact 2 on the main body side is opposed accurately to the contact 4 on the panel body side. For this reason, power source contacts 21 and 41, load contacts 22 and 24, and secondary contacts 23 and 43 are plugged in each other. In case of disassembling the transformer body A from the terminal panel body B, a power source terminal DT and a load terminal FT are short-circuited by a short-circuit switch 5, and then a coupling means 7 is freed, and the transformer body A is pulled out from inside the box 3 while running on the rails 6b, thus the disassembling from the panel body B is done.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an instrument transformer, and more particularly, to the structure of an instrument transformer installed in a power distribution room.

[Conventional technology]

According to the Measurement Act, instrument transformers expire after 15 years and must be replaced, and instrument transformers may need to be replaced due to changes in the power receiving capacity of consumers.

When replacing this instrument transformer, since the conventional instrument transformer is an integral structure, the first thing to do in advance is to: ■ Confirm whether it is okay to cause a power outage on the load side.

■Once confirmed, turn off the load-side main circuit breaker.

■Turn off the power supply line switch.

■Check for no voltage.

■Disconnect both the primary and secondary circuits of the instrument transformer from the distribution line.

■Remove the means to install the instrument transformer.

Next, as part of the instrument transformer replacement work, (1) remove the old instrument transformer.

■Set the new instrument transformer in the specified location.

Finally, as post-processing, ■Fix the new instrument transformer using appropriate means.

■Connect both the primary and secondary circuits of the instrument transformer to the distribution line.

■Check whether it is OK to turn on the power.

■Turn on the power supply line switch.

■Turn on the load side main circuit breaker.

The above procedure accomplishes the replacement of the old instrument transformer with a new instrument transformer.

[Problem to be solved by the invention]

In this way, when replacing a conventional instrument transformer, it is necessary to disconnect the circuit from the load side and the distribution line (power supply) side, so it is necessary to ensure no voltage, and safety is not necessarily sufficient. It would be difficult to say that this was guaranteed.

In addition, during the replacement work of the instrument transformer, it is necessary to cut off the connection between the load side and the power supply side. Therefore, the load side must be in a power outage state while the work is being replaced, and this results in the loss of power to the customer. In addition to causing inconvenience, there is a problem in that the instrument transformer must be replaced at the customer's convenience.

In addition to checking with consumers and checking that there is no voltage,
Since it requires troublesome work such as disconnecting and connecting circuits, there is a problem that replacing the instrument transformer is complicated and takes a long time.

Furthermore, since it is necessary to connect the primary and secondary circuits to each individual terminal, there is a problem in that erroneous connections with connected instruments are likely to occur.

Therefore, the present invention was devised to solve the problems in the prior art described above, and includes a main part having a voltage transformer and a current transformer, and a voltage transformer having a voltage transformer and a current transformer. The technical issue is to divide the current transformer into the power supply side, the load side, and the connection part with the meter, thereby ensuring the safety of the replacement work of the meter transformer. To replace a transformer without interruption, to easily and quickly replace an instrument transformer,
The purpose of this is to eliminate the occurrence of erroneous connections with connected instruments when replacing instrument transformers.

[Failure to solve the problem]

Means of the present invention for solving the above technical problem is to have a transformer main body in which an instrument transformer and an instrument current transformer are built into the outer frame, and to be detachably assembled to the transformer main body, and to be attached to the outer wall surface. In addition to providing a power terminal which is a connection terminal with the distribution line, a load terminal which is a connection terminal with a consumer, and a secondary terminal which is a connection terminal with various meters connected to the instrument transformer, the power terminal The outer frame of the transformer body shall be assembled to the terminal board body with a plug structure power contact and the load terminal on the outer surface in the direction of movement. A main unit side contact consisting of a contact and a secondary terminal contact is provided, and this outer frame is assembled on the wall of the terminal board facing the direction of movement by assembling the transformer main body to the terminal board. It has a plug structure that is electrically connected to the main body side contact, and consists of a power contact connected to a power terminal, a load contact connected to a load terminal, and a secondary terminal contact connected to a secondary terminal. Providing a contactor on the panel side.

The terminal board is a rectangular parallelepiped with one side open, and the contacts on the board side, power terminals, load terminals, secondary terminals, and short-circuit switch are attached to the other side wall of the box that houses the transformer body so that it can be moved in and out. It is advantageous to configure the

An effective means for removably attaching the transformer body to the terminal board is to provide a wheel on the lower surface of the outer frame, and to provide a rail on which the wheel runs on the terminal board so that it can be moved in and out.

When replacing the instrument body, in order to ensure energization by the short-circuit switch between the power supply side and the load side, by removing the transformer body from the terminal board body, the short-circuit condition between the power supply terminal and the load terminal due to the short-circuit switch is removed. It is better to provide a lock bar to lock the

In order to ensure a fixed assembly posture between the transformer body and the terminal block body, each contactor is electrically connected to both the transformer body and the terminal block body. It is preferable to provide a coupling means for fixing the assembly position with the assembly.

[Effect]

The instrument transformer according to the present invention includes a transformer main body having an instrument transformer and an instrument current transformer, a power supply terminal and a load terminal that are connection terminals between the power supply side and the load side of the instrument transformer, and various meters. Since the terminal block body having the terminals and the secondary terminals can be separated, when replacing the instrument transformer according to the Measurement Act or due to changes in the power receiving capacity of the customer, only the transformer body can be replaced. Good.

Therefore, when replacing the transformer, first remove the seal on the short-circuit switch, operate the short-circuit switch to turn it on, and then short-circuit the power terminals and load terminals on the terminal board side. shall be.

In this state, move the old transformer main body in the direction of separating it from the terminal board body, separate the main body side contact and the board side contact which have a plug structure, and separate the transformer main body from the terminal board body. Achieve.

Once separation of the old transformer body from the terminal block body has been achieved, a new transformer body with the same body side contact structure is moved forward toward the terminal block body, and the body side contacts are moved forward toward the terminal block body. Insert it into the contact and complete the setting on the terminal board body.

When the setting of the new transformer main body to the terminal board body is completed, the short circuit switch that is in the "on" state is returned to the "off" state, thereby completing the replacement of the instrument transformer.

Electrical disconnection between the transformer main body and the terminal board body is achieved by attaching and detaching the main body side contactor and the panel side contactor, which have a plug-in structure, and also by connecting and disconnecting the main body side contactor and the panel side contactor. Attachment/detachment is achieved by moving and displacing the transformer main body with respect to the terminal board body, so that the transformer main body can be replaced without the need for an operator to approach live parts where electric shocks are likely to occur.

When replacing the transformer body, the power supply terminal and load terminal are short-circuited using a short-circuit switch on the terminal board side, so there is no need to bring the customer side into a power outage state in order to replace the transformer body. The main body of the transformer can be replaced at any time without causing any inconvenience to the customer and regardless of the convenience of the customer.

Replacing the transformer body is accomplished by switching the short-circuit switch and moving the transformer body relative to the terminal board, so the replacement work is simple and easy, and can be accomplished in an extremely short amount of time. be done.

The replacement of the transformer body is accomplished by leaving the connections of the various instruments to the secondary terminals to the terminal board intact, so there is no risk of incorrect connections of the various instruments occurring when replacing the transformer body. do not have.

If the overall structure of the terminal board body is a rectangular parallelepiped box with one side open, which accommodates the transformer body so that it can be moved in and out,
When the transformer body is assembled to the terminal board body, the entire transformer body is housed inside the terminal board body, so it is easier to maintain the assembled attitude of the transformer body with respect to the terminal board body, and It becomes easier to protect the assembly of the main body side contact and the board side contact, which is the connection part between the transformer main body and the terminal board.

As a means of assembly to guide the assembly and disassembly of the transformer body to and from the terminal board body, wheels are provided on the lower surface of the outer frame of the transformer body, and a rail on which the wheels run is provided on the terminal board side. By doing so, the transformer body moves with its posture regulated in a constant manner relative to the terminal board body, which makes it easier to attach and detach the transformer body to and from the terminal board body, and also prevents contact on the main body side. The attachment and detachment of the contact element and the contact element on the disk body side can be achieved satisfactorily and accurately.

If a lock bar is provided to lock the short-circuit state between the power terminal and load terminal of the short-circuit switch when the transformer body is removed from the terminal board, the short-circuit switch will be operated accidentally while the transformer body is being replaced. This eliminates the inconvenience of power outages on the customer side.

By providing a coupling means on both the transformer body and the terminal block body to fix and maintain the assembled posture of both, it is possible to assemble the transformer body with respect to the terminal block body, which is configured to be movable with respect to the terminal block body. This prevents the inconvenience of the transformer body being incorrectly displaced relative to the terminal board due to vibrations, resulting in poor contact between the contact on the main body and the contact on the board. A safe electrical connection between the transformer body and the terminal board body can be achieved and maintained.

〔Example〕

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

Fig. 1 is a side view showing a state in which the transformer main body A and the terminal board B are removed when the terminal board B has a box structure, Fig. 2 is a plan view thereof, and Fig. 3 is a rear view of terminal board B,
FIG. 4 is a side view showing the assembled state in which the transformer body A is assembled into the terminal board body B.

The transformer main body A has a structure in which a main body side contactor 2 is provided on the rear wall of an outer frame 1 which has a rectangular parallelepiped box structure and houses a potential transformer PT O and a potential current transformer CT. , a power contact 21 having a plug structure is provided at the lower side, a load contact 22 is provided at the center, and a secondary terminal contact 23 is provided at the upper side.
2 has a structure that protrudes rearward from the rear wall, and the secondary terminal contact 23 is provided in a recess that serves as a guide hole.

Wheels 6a are provided on the lower surface of the outer frame 1 and constitute means 6 for assembling the transformer main body A side, and coupling means 7 for the transformer main body A side are provided on the front side of both side walls of the outer frame 10. A constituting main body side bracket) 7a is fixed, and a coupling pole 7c is assembled to this main body side bracket) 7a.

On the other hand, the terminal board B has a structure in which the board-side contacts 4 are provided on the inner surface of the rear wall of the box 3, which has an open front wall and is a rectangular parallelepiped large enough to accommodate the entire transformer main body A. A power contact 41 with a swing and plug structure is provided at the bottom, a load contact 42 is provided at the center, and a secondary terminal contact 43 is provided at the top. It has a structure that protrudes inward from the body 3.

On the outside of the rear wall of the box body 3, there is a power terminal DT in the form of an extension of the power contact 41, and a load contact 42.
Each of the load terminals FT is extended in a protruding manner, and a secondary terminal NT formed by extending each secondary terminal contactor 43 is provided exposed on the outside of the rear wall.

Between the protruding power supply terminal DT and the load terminal FT,
A short circuit switch 5 is provided to switch and connect the power terminal DT and the load terminal FT, but in the illustrated embodiment, as shown in FIG. 3, the center power terminal DT and the load terminal FT are Since they are directly short-circuited in advance, the short-circuit switch 5 connects the power terminal DT and load terminal FT on both sides.
It is provided only between.

On the bottom wall of the box body 3, a rail 6b constituting a means 6 for assembling the terminal board B side is provided, a part of which can be taken in and out of the box body 3. On the inner surface of both side walls,
(Bracket on the board side that constitutes the coupling means 7 on the terminal board B side)
7b is fixed.

Therefore, as shown in FIG. 1, when the transformer main body A is moved into the box 3 of the terminal board B by placing the wheels 6a on the rails 6b pulled out from inside the box 3, the wheels 6a By assembling to the rail 6b, the transformer body A connects to the terminal board body B.
It is inserted into the box 3 with the main body side contactor 2 accurately facing the board side contactor 4, with its position and attitude being restricted.

Therefore, when the transformer main body A is moved and assembled into the terminal board B, plug-in of the main body side contactor 2 and the board side contactor 4 is achieved by operation, and each contactor, i.e. There is no need to perform separate connection operations for power contacts 21 and 41, load contacts 22 and 42, and secondary terminal contacts 23 and 43. In this way, if the connection between the main body side contacts 2 and the board side contacts 4 is achieved by assembling the transformer main body A to the terminal board B, then the opposing main body side brackets)? A and the board side bracket) 7b are connected by a connecting pole) 7c, thereby ensuring that the transformer main body A and the terminal board B are assembled in a constant posture.

When removing the transformer main body A from the terminal board B, after short-circuiting the power terminal DT and the load terminal FT using the short-circuit switch 5, release the coupling means 7, and while the transformer main body A is running on the rail 6b. It is pulled out from inside the box body 3 to accomplish the assembly and removal with the terminal board body B.

Figure 5 shows the specific electric circuit configuration of the transformer body A and the terminal board body B. The transformer body A has two potential transformers PT and two potential current transformers CT. and
In contrast to the transformer body A, the terminal board body B has a simple terminal structure in which a short circuit switch 5 is provided.

6 and 7 show an example of the structure of each contact configured in a plug structure, and each contact of the main body side contact 2 has a terminal bar 2c protruding from inside the resin mold 2f. Attach the contact piece 2a to the end via the plate spring 2b with the bolt 2.
A tulip contact is formed by assembling it in step d, and a cylindrical resin cover 28 is integrally provided with the resin mold 2f to surround this tulip contact.On the contrary, each contact of the board side contact 4 is A contact bar 4a protruding from inside the resin mold 4c, and this contact bar 4a
A cylindrical resin cover 4b that surrounds the main body side contactor 2 and that can be fitted into the resin cover 2e of each contactor of the main body side contactor 2 is integrally provided with the resin mold 4c.

The power supply terminal DT and load terminal FT are connected as shown in FIG.
It has a configuration in which it is embedded in a resin mold 4C attached to the rear wall of the box body 3, and the other end protruding inside the box body 3 is a contact rod 4a.

The short circuit switch 5 provided between the power supply terminal DT and the load terminal FT has a switch piece 5a movably arranged between the power supply terminal DT and the load terminal FT, and a switch piece 5a that is movably arranged between the power supply terminal DT and the load terminal FT. A contact piece 5b that is attached to each of the switch pieces and slidably contacts the switch piece 5a, and a power terminal DT.
The resin mold 4c of the load terminal FT and the resin mold 4c of the load terminal FT
A dustproof cover 5h is attached between the switch piece 5a and the inside thereof is a movement passage for the switch piece 5a. A handlebar 5d that moves with a constant stroke,
It consists of an L-shaped rank 5c whose one end is connected with a pin to the handle par 5d, the other end is connected to the lower end of the switch piece 5a, and the bent part is pivoted to the side wall of the box body 3. , two sets of locking recesses 5e that restrict the movement limit position of the handle par 5d, and a locking recess 5f that engages with the locking means 8 are provided.

Before the transformer body A is separated from the terminal board body B, the short-circuit switch 5 is moved from the open state shown in FIG. Then, if you move it forward to the right in Figure 8, it will be 101! As shown in FIG. 1, the L-shaped rank 5c rotates and pushes up the switch piece 5a to short-circuit the power supply terminal DT and the load terminal FT, and at this time, the engagement pin 10 engages the other locking recess 5e. to hold the handlebar 5d in this forward position.

In this way, with the power supply terminal DT and load terminal FT short-circuited by the short-circuit switch 5, the coupling means 7 is disconnected to separate the transformer body A from the terminal board body B. By releasing the connection between the main body side bracket 7a and the board side bracket 7b by the connection bolt 7c of the connection means 7, the locking means 8 is activated to lock the handle part 5d of the short circuit switch 5, and the replacement work to the transformer main body is performed. inside,
Ensure that the short circuit switch 5 is in the on state.

The locking means 8 includes a support bracket 8 fixed to the box body 3.
A lock par 8a is supported by a guide support pin 8c so as to be movable up and down, and its lower end is fitted into the lock recess f85f of the handle par 5d located at the forward limit when lowered, and a fulcrum pin 8e is attached to the box body 3. A swinging lever 8d is mounted swingably on the locking member 8a, and one end is connected to the upper end of the locking member 8a, and the other end is located close to the plate-side bracket (7b) of the coupling means 7. 8
d rotates counterclockwise in FIG. 10 and lowers the lock par 8a by releasing the pressing force from the coupling pole 7c of the coupling means 7 to the other end.
Fit the lower end of the handlebar into the lock recess 5f, and
d is fixed to ensure a short circuit by the switch piece 5a, and when the new transformer main body A is assembled to the terminal board B and the coupling pole 7c is assembled to the panel side bracket 7b, this coupling bolt 7c Rotate clockwise to lock par 8
The fitting of the handle a into the lock recess 5f is released to allow the handle par 56 to move.

A shutter means 9 provided to prevent the transformer main body A from being separated from the terminal board B when the short-circuit switch 5 does not short-circuit the power supply terminal DT and the load terminal FT is configured to prevent the transformer main body A from being separated from the terminal board B. A shutter plate 9a is rotatably attached to the side wall of the box body 3 near the body side placket 7b with a support pin 9b, and a fixed plate whose one end is connected to the shutter plate 9a and the other end is fixed to the handle par 5d. Bracket) 9c
When the handlebar 5d of the short-circuit switch 5 is in the open retreat position (the state shown in FIG. 8), the handlebar 5d is connected to the connecting rod 9d.
When the connecting rod 9d is pulled by the fixed bracket (fixed bracket) 9c which retreats together with the shutter plate 9a, the shutter plate 9a rotates and stands up, and the connecting means 7 is opened to the outside as shown in FIGS. 8 and 9. The short-circuit switch 5 connects the power terminal DT and the load terminal FT by moving the handlebar 5d forward.
When the state shown in FIG. 8 is reached, in which the terminals are short-circuited, the connecting rod 9d is pushed by the fixed bracket 9C, which moves forward together with the handlebar 5d, and the shutter plate 9a rotates and falls down. As shown in FIG. 3, the coupling means 7 is opened so that it can be operated from the outside.

In this way, when the short circuit switch 5 is off, the coupling means 7 is closed by the shutter means 9.
Therefore, the separation of the transformer body A from the terminal board body B cannot be achieved unless the short circuit switch 5 is turned on, and as a result, the power supply terminal DT This eliminates the inconvenience that the transformer main body A is separated from the terminal board B in an incorrect state where the short circuit between the transformer main body A and the load terminal FT is not achieved.

〔Effect of the invention〕

Since the present invention has the above-described configuration, it has the following effects.

All of the contacts on the main body side are placed only on the rear surface of the outer frame, and each contact has a plug-in structure, so the rear surface of the terminal board body where the power terminals, load terminals, and secondary terminals are located The transformer main body can be replaced without touching a certain live part, thereby ensuring extremely high safety against electric shock accidents.

The transformer is divided into a main body and a terminal board, and a short-circuit switch is installed on the terminal board to short-circuit the power supply terminal and the load terminal, so the transformer main body can be replaced without power outage. The transformer main body can be replaced at an optimal time without causing inconvenience and regardless of the convenience of the customer.

The main body side contactor and the board side contactor that achieve electrical connection between the transformer body and the terminal board body have a plug-in structure, so that the transformer body can be connected to the transformer body simply by moving the transformer body with respect to the terminal board body. The electrical connection with the terminal board body can be disconnected and the transformer body can be replaced by simply moving and displacing the transformer body, and the time required for the replacement work is also extremely short.

Since the electrical connection between the transformer body and the terminal board body is achieved by a plug-in structure, the connection relationship of various instruments to the instrument transformer is fixed, which allows for easy connection between instruments when replacing the transformer body. There is no possibility of erroneous connections occurring.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the instrument transformer according to the present invention, with the transformer main body and the terminal board body separated. FIG. 2 is a plan view of the terminal board of the embodiment shown in FIG. 1 with the top plate of the box removed. FIG. 3 is a rear view of the terminal board body of the embodiment shown in FIG. 1. FIG. 4 is a side view of the transformer main body of the embodiment shown in FIG. 1 assembled to the terminal board body. FIG. 5 is an electric circuit configuration diagram of the transformer body and terminal board body of the embodiment shown in FIG. 1. 6 and 7 are longitudinal sectional side views showing structural examples of the main body side contactor and the board side contactor, and FIG. 6 shows the separated state.
FIG. 7 shows the connection state. 8 and 10 are longitudinal sectional side views showing structural examples of the short circuit switch, assembly means, coupling means, lock means, and shutter means, and FIG. 8 shows the short circuit switch in an open state, and FIG. indicates a short-circuit condition of the short-circuit switch. 9 and 11 are partial front views showing the state of the shutter plate of the shutter means, with FIG. 9 showing the state shown in FIG. 8, and FIG. 11 showing the state shown in FIG. 1. Explanation of symbols A; Transformer main body, 1; Frame body, 2; Main body side contactor, 21;
Power contact, 22; Load contact, 23; Secondary terminal contact, 2a; Contact piece, 2b; Leaf spring, 2c; Terminal bar, 2d
; Bolt, 2e; Resin cover, 2f; Resin mold, B
; Terminal board body, 3; Box body, 4; Board side contact, 41; Power contact, 42; Load contact, 43; Secondary terminal contact, 4
a; Contact bar, 4b; Resin cover, 4c; Resin mold, DT; Power terminal, FT; Load terminal, NT; Secondary terminal,
5; short circuit switch, 5a; switch piece, 5b; contact piece,
5c; L-shaped rank, 5d; handlebar, 5e; locking recess, 5f; locking recess, 5g; guide pin, 5h; dustproof cover, 6; means for assembly, 6a; wheels, 6b; rail,
7; Coupling means, 7a; Main body side bracket, 7b; Panel body side bracket, 7c; Coupling bolt, 8; Locking means, 8a
Lock bar, 8b; Support bracket, 8c; Guide support pin, 8d; Swing lever 8e; Fulcrum pin, 9; Shutter means, 9a; Shutter plate, 9b; Support pin, 9c
Fixed bracket, 9d; Connecting rod, 10; Engagement pin, PT; Potential transformer, CT; Potential current transformer. -f/a

Claims (5)

[Claims] (1) A transformer body (A) with a built-in potential transformer (PT) and a potential current transformer (CT) in the outer frame (1), and a transformer body (A) that is detachably assembled to the transformer body (A). , power terminal (DT), load terminal (FT), and secondary terminal (NT) on the outer wall surface.
), and the power supply terminal (DT) and the load terminal (
a terminal board body (B) provided with a short circuit switch (5) for achieving disconnection with the terminal board body (FT); A main body side contact (2) consisting of a power contact (21), a load contact (22), and a secondary terminal contact (23) having a plug structure is provided, and the terminal board body (B) is moved in the assembly movement direction. A power contact (41) having a plug structure is installed on a wall facing the transformer main body (A) to be electrically connected to the main body side contact (2) by assembling the transformer main body (A) to the terminal board body (B). ), a load contact (42) and a panel side contact (4) consisting of a secondary terminal contact (43). (2) Open one side of the rectangular parallelepiped and open the transformer body (A).
On the other side wall of the box body (3) that stores the
2. The instrument transformer according to claim 1, wherein the terminal board body (B) is constructed by attaching a secondary terminal (NT), a secondary terminal (NT), and a short circuit switch (5). (3) As a means (6) for assembling the transformer main body (A) to the terminal board body (B), wheels (6a) are provided on the lower surface of the outer frame (1), and the wheels (6a) are provided on the lower surface of the outer frame (1). Claim 1 wherein the rail (6b) on which the rail (6a) runs is provided in such a way that it can be taken in and out.
or the instrument transformer described in 2. (4) By removing the transformer main body (A) from the terminal board body (B), the power terminal (DT) and load terminal (FT) are connected by the short circuit switch (5). Claim 1 or 2 further comprising a locking means (8) for locking the short circuit state.
or the instrument transformer described in 3. (5) Both the transformer main body (A) and the terminal board body (B) are provided with coupling means (7) for fixing the assembled posture of the transformer main body (A) and the terminal board body (B). An instrument transformer according to claim 1 or 2 or 3 or 4.