JP2012238683A - Tap changer and pole transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tap changer having an automatic tap changeover function by reutilizing an existing transformer main body, and to provide a pole transformer equipped with the tap changer.SOLUTION: In a tap changer 200 for a pole transformer whose transformer main body 100 includes a body container 101 housing a transformation coil part 102 having a primary coil and a secondary coil, the tap changer 200 comprises: a lid 203 to be attached to/detached from the opening of the body container 101; and a changer main body 202 integrally attached to the lid 203 and having a tap changeover function of the transformation coil part 102. The changer main body 202 has contact points driven by solenoids 211, 212 performing a lifting or dropping movement of the tap according to voltage of the secondary coil 102b, disposing a signal processing part 205 outside a changeover container 201 housing the changer main body 202, the signal processing part 205 generating control signals for driving the solenoids 211, 212 by detecting the voltage of the secondary coil 102b.

Description

  The present invention relates to a tap switching device integrated with a lid attached to a main body container of a pole transformer and a pole transformer provided with the tap switching device.

In recent years, it has been a problem that a distributed power source such as a large number of photovoltaic power generation devices and wind power generation devices connected to an electric power system causes fluctuations in the system voltage.
As a countermeasure, as shown in Patent Documents 1 to 3, a tap switching device that switches a tap of a transformer while supplying power to a load in order to maintain a constant supply voltage to a consumer even when a system voltage fluctuates. A pole transformer with a load tap changer is provided.

Here, the pole transformers described in Patent Documents 1 and 2 are those in which insulating oil is filled in a container in which the transformer main body and the tap switching device are housed, and the tap is switched by manual operation of the handle.
Moreover, the pole transformer described in Patent Document 3 automatically taps the primary coil by driving the corresponding solenoid by selecting tap-up or tap-down according to the voltage of the secondary coil of the transformer. It has a structure to switch.

Japanese Patent Laid-Open No. 10-275731 (paragraphs [0017] to [0026], FIGS. 1 to 4 and the like). JP 2005-5401 A (JP 10-275731 A (paragraphs [0015] to [0025], FIGS. 1 to 6 and the like). JP 2010-93050 A (paragraphs [0024] to [0095], FIGS. 1, 21, 23, 24, etc.).

Now, pole transformers are inspected, repaired, and replaced at regular intervals, and these operations are repaired and re-installed on the poles by repairing the functions of the pole transformers to be inspected and repaired. The purpose is that. However, for example, in a pole transformer provided with a manual tap switching device such as Patent Documents 1 and 2, when inspecting and repairing the pole transformer, a more advanced automatic tap switching function such as Patent Document 3 is provided. There is a request to prepare.
In this case, conventionally, the pole transformer itself must be replaced with one having an automatic tap switching device.

However, even though the transformer body can be fully used in the future by inspection, repair, and parts replacement, replacing the entire pole transformer will waste resources and energy and increase costs. .
SUMMARY OF THE INVENTION Therefore, a problem to be solved by the present invention is to provide a tap switching device that can provide an automatic tap switching function to a pole transformer while reusing an existing transformer body, and a pole transformer provided with the tap switching device. Is to provide a vessel.

In order to solve the above-mentioned problem, a tap switching device according to claim 1 is a tap switching device for a pole transformer in which a transformer coil part having a primary coil and a secondary coil is housed in a main body container to constitute a transformer body. In
A lid that is detachably attached to the opening of the main body container, and a switching device main body that is integrally attached to the lid and has a function of switching taps of the transformer coil portion.

  The tap switching device according to claim 2 is the tap switching device according to claim 1, wherein the switching device body performs a tap raising operation or a tap lowering operation of the primary coil in accordance with a voltage of the secondary coil. A contact driven by a tap drive unit is provided, and the tap of the primary coil is switched by this contact.

  The tap switching device according to claim 3 is the tap switching device according to claim 2, wherein the switching device main body is housed in a switching device container, and the voltage of the secondary coil is provided outside or inside the switching device container. And a signal processing unit that generates a control signal for driving the tap driving unit.

  A pole transformer according to a fourth aspect includes the transformer main body according to the first aspect and the tap switching device according to any one of the first to third aspects.

According to the present invention, an automatic tap switching function can be achieved while reusing an existing transformer body by a tap switching device in which a lid mounted on a main body container of a transformer body and a switching device body are integrally configured. The provided pole transformer can be easily manufactured.
Thereby, compared with the case where the whole pole transformer is replaced | exchanged, resource, energy, and cost can be reduced significantly.

It is an external view of a pole transformer concerning an embodiment of the present invention, and Drawing 1 (a) is a top view and Drawing 1 (b) is a front view. It is a circuit lineblock diagram of a pole transformer and a tap change device concerning an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external view showing a pole transformer according to this embodiment. FIG. 1 (a) is a plan view and FIG. 1 (b) is a front view.

In these drawings, reference numeral 100 denotes a transformer main body. Inside the bottomed cylindrical main body container 101, a transformer coil portion 102 including a core, a primary coil, and a secondary coil is immersed in insulating oil. The transformer coil unit 102 transforms, for example, a high voltage of 6.6 [kV] in the distribution system to a low voltage of 200 (210) [V] or 100 (105) [V].
From the main body container 101, a primary cable 103 for connecting the primary coil to the power distribution system and a secondary cable 104 for connecting the secondary coil to the lead-in wire on the customer side are drawn out.

  Reference numeral 200 denotes a lid-integrated tap switching device, which includes a switching device main body 202 built in the switching device container 201, a lid 203 fixed to the lower end of the switching device container 201, and a control box 204 described later. I have. That is, in the tap switching device 200, the lid 203, the switching device container 201, the switching device main body 202, and the control box 204 are integrally configured, and these are formed as one independent member.

The switching device main body 202 is connected to the tap of the primary coil of the transformer coil unit 102 to change the number of turns, a fixed contact or a movable contact, a movable body for driving the movable contact, a plurality of solenoids described later, a solenoid driver, It consists of a flow resistance and a converter for detecting the voltage across the secondary coil.
On the other hand, the lid 203 is a bottomed cylindrical lid having an inner diameter adapted to the upper opening of the main body container 101, and the fastening fitting 302 on the lid 203 side is connected to the mounting bracket 301 fixed to the main body container 101. Then, by tightening the fastening bolt 303, the main body container 101 is detachably mounted. The lid 203 is attached to the main body container 101 via an annular packing (not shown).

A substantially L-shaped control box 204 is attached to the side surface of the switching device container 201 when viewed from the front. The control box 204 is disposed at the above position so as to be less susceptible to the temperature rise due to heat generation and solar radiation of the transformer coil section 102, the influence of insulating oil, and the like. The main part, the communication part 214 and the like are accommodated.
In addition, when the signal processing unit 205 and the communication unit 214 are provided with countermeasures that are not affected by the above-described temperature rise or insulating oil, they may be stored in the switching device container 201. .

Next, FIG. 2 is a circuit configuration diagram of the tap switching device and the pole transformer according to this embodiment, and the same members as those in FIG.
In FIG. 2, taps 1-6 provided on the primary coil 102a of the transformer coil section 102 are fixed contacts 1-6 of the switching device main body 202 (corresponding to each tap are given the same numbers). It is connected. Here, both ends of the primary coil 102a are connected to the 6.6 [kV] distribution system via the primary cable 103 described above. The symbols (+) and (−) attached to the primary cable 103 are the polarity of the system voltage at a certain moment.

  202a in the switching device main body 202 is a movable body, and R is a current limiting resistor. Since the circuit configuration of the switching device main body 202 is not the gist of the present invention, a detailed description thereof will be omitted. Any configuration other than that shown in the figure may be used as long as it has a function of switching the taps of 102 and changing the number of turns of the coil.

  The secondary coil 102b of the transformer coil unit 102 is V-connected, and an AC low voltage of 210 [V] or 105 [V] is output from the secondary cable 104 connected to the secondary coil 102b. ing. N represents a neutral point.

  Between the neutral point N and one end of the secondary coil 102b, the primary side of the conversion unit 206 made of a transformer is connected. Units 209 are sequentially connected. Here, the conversion unit 206, the rectification unit 207, the A / D conversion unit 208, and the central processing unit 209 constitute a signal processing unit 205.

In the signal processing unit 205, the AC voltage at both ends of the secondary coil 102b is converted to a predetermined level by the conversion unit 206, converted to a DC voltage by the rectification unit 207, and then converted to a digital signal by the A / D conversion unit 208. Then, it is sent to a central processing unit 209 made up of a CPU or the like, and the fluctuation of the system voltage is detected from the voltage across the secondary coil 102b.
The central processing unit 209 determines the necessity of the tap raising operation and the tap lowering operation for keeping the supply voltage to the consumer constant according to the fluctuation of the system voltage, and controls the solenoid driving unit 210 according to the result. Send a signal. The solenoid driving unit 210 energizes the tap raising solenoid 211 or the tap lowering solenoid 212 according to the control signal, and drives the movable body 202a of the switching device main body 202 to perform the tap raising operation or the tap lowering operation. Reference numeral 213 denotes a fixing solenoid for holding the contact position of the switching device main body 202.
Here, the solenoid driving unit 210 and each of the solenoids 211 to 213 constitute the tap driving unit in the claims, but it goes without saying that the means for driving the tap of the transformer coil unit 102 is not limited to the solenoid, for example, A direct drive mechanism or a spring drive mechanism using a motor may be used. In FIG. 2, the solenoid drive unit 210 and the solenoids 211 to 213 are displayed outside the switching device main body 202, but this means that the solenoid drive unit 210 and the solenoids 211 to 213 and the switching device main body 202 are physically connected. It does not mean that they are arranged separately. That is, the switching device main body 202 shown in FIG. 1B is a block including the solenoid driving unit 210 and the solenoids 211 to 213.

A communication unit 214 is connected to the central processing unit 209. The communication unit 214 is for switching taps by remote operation from the outside by wireless communication using a mobile phone line or the like.
As described above, the main part of the signal processing unit 205 and the communication unit 214 are accommodated in the control box 204 (or the inside of the switching device container 201) of FIG. 1, and the conversion unit 206, the solenoid driving unit 210, and each solenoid. 211 to 213 are built in the switching device container 201.
The tap switching operation with the configuration shown in FIG. 2 is described in detail in Patent Document 3 described above.

As is apparent from the above description, the tap switching device 200 according to the present embodiment is configured by integrating the switching device container 201 and the switching device main body 202 with a lid 203 attached to the main body container 101.
For this reason, if the inner diameter of the lid 203 is adapted to the outer diameter of the opening of the main body container 101 of the existing pole transformer, it is integrated with the lid 203 by using the mounting bracket 301, the fastening bracket 302, etc. The tap switching device 200 can be used by being mounted on a main body container 101 of a pole transformer that does not have an automatic tap switching function.
For example, for the pole transformer of the type in which the main body container 101 has a built-in transformer coil unit and a manual tap switching device, the manual type tap switching device is removed and the transformer coil unit is tapped. For the pole transformer of the type that is connected to the tap switching device 200 of the embodiment and does not originally include the manual tap switching device, the tap of the transformer coil section is directly used in the tap switching device 200 of the present embodiment. Just connect.

  That is, according to this embodiment, by applying the tap switching device 200 in which the lid 203 and the switching device main body 202 adapted to the main body container 101 are integrally configured to the standardized transformer main body 100. A pole transformer having an automatic tap switching function can be easily manufactured. For this reason, the transformer main body which does not have an automatic tap switching function can be used effectively, and resource, energy, and cost can be significantly reduced as compared with the case where the entire pole transformer is replaced.

DESCRIPTION OF SYMBOLS 100: Transformer main body 101: Main body container 102: Transformer coil part 102a: Primary coil 102b: Secondary coil 103: Primary cable 104: Secondary cable 200: Tap switching device 201: Switching device container 202: Switching device main body 202a: Movable Body 203: Lid 204: Control unit 205: Signal processing unit 206: Conversion unit 207: Rectification unit 208: A / D conversion unit
209: Central processing unit 210: Solenoid drive unit 211: Tap raising solenoid 212: Tap lowering solenoid 213: Fixing solenoid 214: Communication unit 301: Mounting bracket 302: Fastening bracket 303: Fastening bolt R: Current limiting resistance N: Neutral point

Claims (4)

In the tap switching device for a pole-mounted transformer in which the transformer coil portion having the primary coil and the secondary coil is housed in the main body container and constitutes the transformer body.
A tap comprising: a lid detachably attached to the opening of the main body container; and a switching device main body integrally attached to the lid and having a function of switching the tap of the transformer coil portion. Switching device. In the tap switching device according to claim 1,
The switching device main body includes a contact driven by a tap driving unit that performs a tap raising operation or a tap lowering operation of the primary coil according to a voltage of the secondary coil, and the tap of the primary coil is switched by the contact. A tap switching device. In the tap switching device according to claim 2,
The switching device main body is housed in a switching device container, and a signal processing unit that detects a voltage of the secondary coil and generates a control signal for driving the tap driving unit outside or inside the switching device container. A tap changer characterized by being arranged.   A pole transformer comprising the transformer main body according to claim 1 and the tap switching device according to any one of claims 1 to 3.

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