JPH056652Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Field of Industrial Application] The present invention relates to an uninterruptible tap switching device for a current limiting resistor type high voltage transformer. [Prior art] As shown in Figure 3, electric power companies
100V electricity is supplied to consumers such as general households via a 6KV high-voltage distribution line 2 and a pole-mounted high-voltage transformer 3. The pole-mounted high voltage transformer 3 is installed in anticipation of a temporary increase in the number of customers. When the number of consumers increases or during the summer, the voltage drop on the 6KV distribution line 2 increases, the voltage of consumers decreases, and the performance of home appliances decreases, so it becomes necessary to increase the voltage. Currently, power is cut off and the taps on pole-mounted high-voltage transformers are switched, but there is opposition from customers to power outages, and it is becoming difficult to obtain permission for power outages. Therefore, it is desired to use an uninterruptible tap switching device. With conventional uninterruptible tap switching devices,
The first and second switching operation switches for high voltage are connected in parallel between the 6KV high voltage lines, and these first and second
The excitation coils of the first and second switching electromagnetic switches are connected in series to the switching operation switch, and the high voltage transformer can be operated without interruption by operating the contacts of these first and second switching electromagnetic switches. Performing tap switching. [Problems to be solved by the invention] However, in such a conventional uninterruptible tap switching device, high voltage components of 6KV must be used as the first and second switching electromagnetic switches.
There were problems in that the shape was large, the cost was high, and it was difficult to handle. In addition, conventionally the first and second
Since high-voltage parts such as electromagnetic switches for switching were individually suspended from the ground using insulators, there was also the problem of high costs. An object of the present invention is to provide an uninterruptible tap switching device for a high voltage transformer in which the first and second switching electromagnetic switches can be formed from low voltage components. [Means for Solving the Problems] To explain the configuration of the present invention for achieving the above object, the present invention has a normally open first and second changeover operation switch connected in parallel between the control power supply lines, The first and second switching operation switches are provided with excitation coils of first and second switching electromagnetic switches that are energized by turning on the switches, and are connected in series between the high voltage lines. The normally closed contact of the first switching electromagnetic switch is connected in series between the primary main winding and the primary tap winding of the high voltage transformer, and the normally closed contact of the first switching electromagnetic switch is connected in series with the primary main winding and the normally closed contact. A normally open contact of the first switching electromagnetic switch and a normally open contact of the second switching electromagnetic switch are connected in parallel between the connection point and the tap terminal of the primary tap winding, A current limiting resistor is connected in series to the normally open contact of the second switching electromagnetic switch, and the uninterruptible tap switching device for a high voltage transformer performs tap switching of the high voltage transformer without interruption. The primary windings of the first and second operation isolation transformers are connected in series to the first and second changeover operation switches, and the primary windings of each of the first and second operation isolation transformers are connected in series. The excitation coils of the first and second switching electromagnetic switches are connected in phase correspondence between the next windings, and the first and second operating insulation transformers, the first and second The switching electromagnetic switch and the current limiting resistor are supported by a common support plate, and the support plate is floated above the ground via an insulating member. [Function] In this way, the primary windings of the first and second operation isolation transformers are connected in series to the first and second changeover operation switches in a phase-corresponding manner, and the Second
When the excitation coils of the switching electromagnetic switches are connected in phase with each other, low-voltage switches can be used as the first and second switching electromagnetic switches. In addition, the first and second electromagnetic switches for switching, the first and second operating isolation transformers, etc. are supported on a common support plate and lifted off the ground using insulating members, which reduces costs compared to conventional methods. can be reduced. [Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 2. As shown in the figure, the uninterruptible tap switching device of the high voltage transformer of this embodiment has a normally open first and second tap switching device between 200V control power lines 4A and 4B.
The changeover operation switches 5 and 6 are connected in parallel. These first and second changeover operation switches 5 and 6
The primary windings 7A and 8A of the first and second operating isolation transformers 7 and 8 are connected in series in a phase-corresponding manner. The secondary windings 7B, 8B of the first and second operating insulation transformers 7, 8 are connected to the excitation coils 9A, 10 of the first and second switching electromagnetic switches 9, 10.
A are connected in a corresponding manner. Single phase 3 is installed between 6KV high pressure line 2A and 2B.
A primary main winding 3A1 and a primary tap winding 3A2 of the wire high voltage transformer 3 are connected in series. These 1
A normally closed contact 9B of the first switching electromagnetic switch 9 is connected in series between the secondary main winding 3A1 and the primary tap winding 3A2. Between the connection point between the primary main winding 3A1 and the normally closed contact 9B and the tap terminal 3C of the primary tap winding 3A2, the normally open contact 9C of the first switching electromagnetic switch 9 and the second Switching electromagnetic switch 10
normally open contacts 10B are connected in parallel. A current limiting resistor 11 is connected in series to the normally open contact 10B of the second switching electromagnetic switch 10. High voltage transformer 3
The two secondary windings 3B1 and 3B2 are connected in series, and AC 100V is output from both ends of these secondary windings 3B1 and 3B2, respectively. The voltage across the secondary windings 3B1, 3B2 connected in series is applied to the control power lines 4A, 4B. The high voltage section 12 of such an uninterruptible tap switching device
The first and second operation insulating transformers 7 and 8, the first and second switching electromagnetic switches 9 and 10, and the current limiting resistor 11 and other parts are mounted on a common support plate 13 made of an iron plate or the like. The support plate 13 is lifted off the ground by an insulator 14 as an insulating member. Next, a tap switching operation using such an uninterruptible tap switching device will be explained with reference to Table 1. In Table 1, ○ marks indicate an excited state, and × marks indicate a non-excited state.

[Table] Normally, both the first and second changeover operation switches 5 and 6 are off, and the first and second changeover electromagnetic switches 9 and 1
0 excitation coils 9A and 10A are in a non-excited state, and the primary side electrical circuit of the high voltage transformer 3 is
A-normally closed contact 9B-primary tap winding 3A2. [A] Tap terminal 3C of high voltage transformer 3 to 6750V
→When switching to 6600V, turn on the second changeover operation switch 6, and turn on the excitation coil 10 of the second changeover electromagnetic switch 10.
Excite A. This turns on the normally open contact 10B,
The primary side electrical circuit of the high voltage transformer 3 is the primary main winding 3
A1 - normally open contact 10B - current limiting resistor 11 - tap terminal 3C - primary tap winding 3A2,
The number of turns of the primary tap winding 3A2 is reduced. The second changeover operation switch 6 is left on, the first changeover operation switch 5 is turned on, and the excitation coil 9A of the first changeover electromagnetic switch 9 is energized. As a result, the normally closed contact 9B is turned off and the normally open contact 9C is turned on, and the electrical path on the primary side of the transformer 3 is as follows: primary main winding 3A1 - normally open contact 9C - tap terminal 3C - primary tap winding 3A2 The path is the above-mentioned primary main winding 3A1-normally open contact 1
0B - current limiting resistor 11 - tap terminal 3C - formed in addition to the path of the primary tap winding 3A2. [B] Tap terminal 3C of high voltage transformer 3 to 6600V
→When switching to 6750V, turn off the first changeover operation switch 5 and de-energize the excitation coil 9A of the first changeover electromagnetic switch 9. As a result, the normally closed contact 9B returns to ON, the normally open contact 9C returns to OFF, and the electrical path on the primary side of the transformer 3 is connected to the primary main winding 3A1 - normally open contact 10B - current limiting resistor 11 - tap terminal 3C - In addition to the path of the primary tap winding 3A2, the primary main winding 3A1
- Normally closed contact 9B - becomes the path for the primary tap winding 3A2. The second changeover operation switch 6 is turned off, and the excitation coil 10 of the second changeover electromagnetic switch 10 is turned off.
Let A be de-energized. As a result, the normally open contact 10B is opened, and the primary side electrical circuit of the high voltage transformer 3 is connected to the primary main winding 3A.
1 - normally closed contact 9B - only the path of the primary tap winding 3A1. In the above embodiment, the insulator 14 was used as a means for lifting the support plate 13 above the ground, but it goes without saying that other insulating members such as polyvinyl chloride or rubber-based insulators may be used. In addition, in the above embodiment, the contacts 9B, 9C, 10
Although we have explained the usage condition in which B, current limiting resistor 11, etc. are connected to the high voltage transformer 3, it goes without saying that this uninterruptible tap switching device is connected to the high voltage transformer after tap switching, as is conventionally done. It may be removed from the In this case, the terminal of the primary main winding 3A1 of the high voltage transformer 3 and the primary tap winding 3A2
It is connected to the corresponding terminal by a short circuit, and this uninterruptible tap switching device is used when changing the connection of this short circuit, that is, when switching taps. [Effects of the invention] As explained above, the uninterruptible tap switching device for a high voltage transformer according to the invention has the primary windings of the first and second operation isolation transformers connected to the first and second changeover operation switches. Since the wires are connected in series in phase correspondence, and the excitation coils of the first and second switching electromagnetic switches are connected in phase correspondence to each secondary winding, these first and second switching electromagnetic switches A low-pressure device can be used as the container, and its size can be reduced. In addition, the first and second electromagnetic switches for switching, the first and second operation insulating transformers, etc. are supported on a common support plate and suspended from the ground by insulating members, compared to conventional methods. This has the advantage of reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram showing one embodiment of the uninterruptible tap switching device according to the present invention, Fig. 2 is a perspective view of the high voltage part of the device of this embodiment, and Fig. 3 is a general power distribution system diagram. . 1...Substation, 2...High voltage distribution line, 3...High voltage transformer, 3A1...Primary main winding, 3A2...Primary tap winding, 3C...Tap terminal, 4A, 4B...
...Control power line, 5, 6...First and second switching operation switches, 7, 8...Isolation transformer for first and second operation, 9,10...First and second switching electromagnetic Switch, 9A, 10A...excitation coil, 9B...
...Normally closed contact, 9C...Normally open contact, 10B...Normally open contact, 11...Current limiting resistor, 12...High voltage section, 13
...Support plate, 14...Insulator as an insulating member.

Claims (1)

[Scope of utility model registration request] A normally open first and second switching operation switch is connected in parallel between the control power supply lines, and the first and second switching operation switches have first and second switching electromagnetic switches that are energized by turning on the switching operation switch. The first electromagnetic switch for switching is provided between the primary main winding and the primary tap winding of the high voltage transformer, in which excitation coils of the switch are provided in correspondence with each other, and the high voltage transformer is connected in series between the high voltage lines. The normally closed contacts of the first switching electromagnetic switch are connected in series, and the normally closed contacts of the first switching electromagnetic switch are connected between the connection point of the primary main winding and the normally closed contacts and the tap terminal of the primary tap winding. An open contact and a normally open contact of the second switching electromagnetic switch are connected in parallel, and a current limiting resistor is connected in series to the normally open contact of the second switching electromagnetic switch,
In the uninterruptible tap switching device for a high voltage transformer that performs tap switching of the high voltage transformer without interruption, the first and second changeover operation switches each include a primary winding of a first and second operation isolation transformer. The wires are connected in series in phase correspondence, and the excitation coils of the first and second switching electromagnetic switches are connected in phase correspondence between the secondary windings of the first and second operating isolation transformers. The first and second operating isolation transformers, the first and second switching electromagnetic switches, and the current limiting resistor are supported by a common support plate, and the support plate is an insulating member. An uninterruptible tap switching device for a high-voltage transformer, characterized in that it is suspended above the ground via a.