JPS5856246B2 - Tap transformer with pressure compensation between separate oil chambers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tap changer having an oil chamber separate from the transformer oil chamber, and wherein the transformer oil chamber and the tap changer oil chamber each have their own conservator. This relates to a tap transformer located in a hot spring.

Such tap transformers are well known (Mes-chi
nenfabrik Revnhausen Publications”
Tap Changer Type” (March 1970, p. 9).

The use of two separate oil chambers for the transformer and tap changer is often carried out especially for high power transformers.

This ensures that the load changer oil, which is contaminated by the changeover, as can occur with a conservator common to the transformer and tap changer, does not mix with the transformer oil in any case.

However, due to the completely separated oil chambers, significant pressure differences occur between the oil chambers.

This may be due, for example, to the electrical load on the transformer, especially during start-up, or to different solar radiation.

This pressure difference in the oil chamber requires a pressure-resistant oil chamber for the tap changer, which results in considerable costs.

Additionally, tap changers with pressure-resistant oil chambers result in a more modified tap changer type, but the interchangeability of the tap changers is limited.

Tap changers with pressure-resistant oil chambers also require additional maintenance costs.

This is because, in addition to normal maintenance-based functions, density must also be monitored.

The problem of the present invention is to develop the tap transformer mentioned at the beginning so that a mixture of transformer oil and load change stagnant oil can be circulated even when a tap changer without a pressure-resistant oil chamber is used. It is to let.

This problem is solved by the means described in the claims.

The advantage obtained with the present invention is that when a pressure difference occurs in the oil chambers, the pressure compensating vessel provides a complete pressure guarantee between the oil chambers, and the oil chamber of the tap changer and especially its sealing do not depend on the pressure. There is a particular thing.

Furthermore, the pressure compensating vessel is additionally and casually attached to the already manufactured transformer.

This is expediently done as follows.

That is, a pressure compensating vessel with a corresponding conduction tube is connected to both conservators, and the smaller oil volume of the tap changer is connected to a plastic sac arranged in the pressure compensating vessel,
The unilateral conservator is coupled to the pressure compensating vessel itself.

The conductor lines between the individual oil chambers to be used for this purpose have an acceptable pressure drop when charging the oil flow, and an immediate and complete pressure compensation between the transformer and tap changer oil chambers is ensured. be exposed.

Next, the present invention will be explained with reference to the drawings.

The new tap transformer is essentially Transformer 2 (not detailed)
is arranged, and a tap changer 4 provided with an oil container 3 is further arranged.

The oil sink 1 of the transformer 2 is connected to a conservator 6 through a conductor 5.

The conductor 5 is fitted with a Buchholz wire in the usual manner.
l z ) A protective device 7 is arranged.

The oil container 3 of the tap changer is connected to the oil flow relay 9 in the usual way.
It is coupled to the conservator 10 through a conductor 8 in which the conservator 10 is arranged.

Both conservators 6 and 10 are connected to a pressure compensating vessel 13 through conducting lines 11 and 12.

The pressure compensating vessel 13 consists of a fixed housing 14 and a flexible synthetic resin membrane 15 arranged therein.

In this case, the tap changer 4 and the associated conservator 1
The small oil volume of 0 is connected to the plastic membrane 15, while the large oil volume of the transformer oil tank and the associated conservator 6 is connected to the housing of the pressure compensation vessel.

Flexible oil-tight synthetic resin membrane 15 in pressure compensating vessel 13
thus allows direct pressure compensation between both separate oil containers.

The valves 16 arranged in the conducting parts 5, 8, 11 and 12 are
It is a simple check valve that allows access to the oil chamber during maintenance work.

[Brief explanation of drawings]

The figure shows an embodiment of the invention.

Claims (1)

[Scope of Claims] 1. A tap changer having an oil chamber separate from the transformer oil chamber, wherein the transformer oil chamber and the tap changer oil chamber are each equipped with its own conservator. In the arranged tap transformer, the oil chamber 1 of the transformer 2 and the oil chamber 3 of the tap changer 4 are connected to a common pressure compensation vessel 13, and the pressure compensation vessel 13 is connected to the oil chamber 1 of the transformer and the oil chamber 3 of the tap changer 4. Said tap transformer, characterized in that the oil chamber 3 of the tap changer has two volumes separated by an oil-tight flexible casing 15 so as to be connected to a respective volume of said pressure compensating vessel. 2. The pressure compensating vessel 13 is connected to the expansion vessels 6, 10, the conservator 10 is connected to a plastic bag placed in the pressure compensating vessel 13, and the one-sided conservator is connected to the pressure compensating vessel itself. A tap transformer according to claim 1, characterized in that: