JPH0217615A - Split-type oil-immersed transformer device - Google Patents

Abstract

PURPOSE:To divide into transformers and a common terminal part by introducing fire-resistant water into a duct to prevent spread of an occurred accident by providing a water-screen device for preventing fire among two transformers and the common terminal part and providing a heat-sensitive sensor within an intermediate connection duct screened by an oil gas bushing and an insulation spacer. CONSTITUTION:Heat-sensitive sensors 13A and 13B are provided within intermediate ducts 8A and 8B connecting transformers TA and TB placed at both sides of a cable box 4 of a division-type transformer device. If one of two transformers TA and TB of this transformer device which are in parallel operation fails and causes fire to break out, a protection device within a transformer where the accident occurred is activated and water-screen devices 9A and 9B provided between the transformers TA or TB and a cable box 4 is activated, thus protecting a common terminal side 7 and appropriate transformer TB or TA from fire of the failed transformer. Thus, a fire-extinguishing device 14A or 14B of the transformer TA or TB where an accident occurred is activated, thus spraying fire-extinguishing water and preventing fire from spreading.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a split-back type electric device having two oil-filled electric devices connected by a cable or a gas-insulated bus bar so that parallel operation is possible. Related to oil-immersed transformer equipment.

[Conventional technology]

As described in Japanese Utility Model Application Publication No. 62-32515, the conventional device is designed to handle problems in a transformer bank in which two transformers are connected in parallel, when the second transformer causes an accident and is disconnected. At least two insulating spacers are provided in the connecting duct that connects both transformers and the common terminal, so that it is easy to put in and take out a small amount of insulating oil and restore the operating state to one side in a short time.
Furthermore, a grounding seat and a drain pipe are provided on the insulating spacer side of the connecting duct that is closer to the transformer.

As shown in Fig. 2, the conventional split type transformer is as follows:
Two three-phase oil-immersed transformers TA and TB have transformer contents 1
is stored in a transformer tank 2 together with insulating oil. This transformer tank 2 is provided with a conservator 3 to compensate for expansion and contraction of the insulating oil. Also, in order to connect two transformers TA, TB to the cable in parallel, both transformers TA.

A connection cable box 4 is installed in the middle of the TB.

This cable connection box 4 has a cable terminal 7 rising from the foundation. In addition, in order to prevent the accident from spreading, oil-gas bushings 5 are inserted through the single-car transformer TA and TB.
Insulating spacer 6 for partitioning A, 5B and common terminal 7
A, 6B and intermediate connecting ducts 8A, 8B. Although FIG. 2 shows a case in which the common terminal portion and the intermediate connection duct portion are made of gas, it is of course possible to make these portions of insulating oil.

[Problem to be solved by the invention]

The above-mentioned conventional technology claims that if either of the two transformers is involved in an accident, the faulty transformer can be disconnected from the grid and quickly restored to unilateral operation without having to shut down the healthy transformer. .

However, in the conventional technology, if an accident occurs in either of the two transformers, it does not take into account the spread of the accident to the common terminal and other transformers. No consideration was also given to the spread of secondary accidents. For this reason, if an accident with one transformer occurs at the common terminal,
Furthermore, if the problem spreads to other transformers, the entire transformer bank must be shut down and disconnected from the grid.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transformer device in which disaster prevention measures are taken to prevent an accident in one of two transformers from spreading to the common terminal and other transformers.

[Means to solve the problem]

The above object is achieved by dividing the two divided transformers and the common terminal section for disaster prevention purposes.

That is, a water curtain device for fire prevention is provided between the two transformers and the common terminal portion, and at the same time, a heat detection sensor is provided in the intermediate connecting duct separated by an oil-gas bushing and an insulating spacer. This is achieved by connecting a fire extinguishing pipe that can introduce fire extinguishing water to the intermediate connecting duct.

[Effect]

The water curtain device installed between the two transformers and the common terminal section is
By creating a system that is activated by the operation of the protection device installed in the transformer that caused the accident, it is possible to separate the accident transformer and the common terminal part for disaster prevention purposes, and the common terminal part from the outside of the accident transformer can be separated. prevent accidents from spreading to On the other hand, a heat sensor installed in the intermediate connection duct detects the thermal influence on the common terminal through the middle connection duct,
By activating the fire extinguishing equipment connected to the intermediate connection duct and introducing fire extinguishing water into the intermediate connection duct, the accident will be prevented from spreading to the common terminal section of the accident transformer.

In this way, by providing fire extinguishing equipment for disaster prevention inside and outside the connecting duct in the intermediate connecting duct that connects the transformer and the common terminal, the common terminal and This can prevent accidents from spreading to other transformers.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. In a split transformer system, each transformer is connected in parallel to a cable or gas insulated busbar. In addition, between the contents of the transformer and the cable or gas-insulated bus terminal, a Ura-Ura spacer or
Oil-gas bushings and insulating spacers are located.

The split type transformer device of the present invention is different from the conventional one shown in FIG.
B is provided, and heat sensing sensors 13A, 13B are provided in the intermediate connecting ducts 8A, 8B, and fire extinguishing pipes 11A, IIB for introducing fire extinguishing water into the intermediate connecting ducts are provided.

Now, if transformer TA causes an internal accident while the two transformers TA and TB shown in Figure 1 are operating in parallel, and oil gushes out from the flange of the transformer tank and a fire occurs, the accident transformer TA
The protection device installed inside operates, and the water curtain devices 9A and 9B
If the three-way valve at the base of the transformer is activated and the system is set up so that the water curtain installed between the transformer TA and the cable box 4 is activated, the fire at the accident transformer TA can be protected from the common terminal 7 side and , a healthy transformer 1゛B can be protected.

Also, at that time, the fire extinguishing system on the transformer TA side works and the fire extinguishing pipe 1
Spray fire extinguishing water from 4A. On the other hand, if unfortunately the fire continues even after the fire extinguishing pipe 14A is activated, there is a risk that the fire in the faulty transformer TA will spread to the common terminal 7 side from the inside via the intermediate connection duct. For this reason, a heat sensing sensor 13A is provided in the intermediate connection duct 8A,
By the operation of this heat detection sensor, fire extinguishing water is introduced from the fire extinguishing water introduction pipe 11A into the intermediate connection duct. By this, it is possible to completely prevent the influence of the fire caused by the faulty transformer TA from spreading to the common terminal 7 side from both the outside and the inside.

In that case, if the foundations are on the same level, an oil dike may be installed to prevent the ignited insulating oil from the damaged transformer TA from moving to the healthy transformer TB. is necessary. The above description has been made assuming that the faulty transformer is transformer TA, but the same applies when the faulty transformer is TB. 13B detects a fire and injects fire extinguishing water into the intermediate connection duct 8B, thereby preventing an accident in the transformer TB from spreading to the common terminal section 7.

FIG. 3 shows another embodiment of the invention. In Figure 3,
Firewall 15A instead of water curtain devices 9A and 9B shown in FIG.
, 15B between both transformers and the common terminal 7, similar effects can be obtained.

FIG. 4 shows a case where a surge arrester 16 is installed at the common terminal 7. In this case as well, considering the lightning arrester in the same way as the common terminal 7, it is sufficient to provide a water screen device between the transformer and the lightning arrester in order to prevent the accident from spreading from the faulty transformer side. Although the embodiments of the present invention have been described with reference to the case where the common terminal portion is made of gas, similar effects can be obtained even when the common terminal 7 and the intermediate connecting duct portion are filled with oil.

However, in order to prevent the accident from spreading to the common terminal 7. In addition, it is desirable for disaster prevention to use gas for the intermediate connecting ducts 8A and 8B. Also, both transformers TA and TB
Even if the side oil-gas bushing is attached to the water tank, the effects of the present invention will not change.

In addition, by installing electric three-way valves under the water curtain pipes 9A and 9B and the firefighting pipe for the intermediate connecting duct, water can be supplied only to the fire extinguishing equipment side of the accident equipment, and water from the fire extinguishing water equipment can be supplied. The capacity of the tank and water pump can be reduced, and equipment costs can be reduced.

〔Effect of the invention〕

According to the present invention, even if an accident occurs in one of the transformers of a split type transformer, it is possible to completely prevent the accident from spreading to the common terminal section and the other transformer. The transformer is operational.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the present invention, FIG. 2 is a side sectional view of a conventional structure, and FIGS. 3 and 4 are side sectional views of other embodiments of the present invention. TA, TB...Oil-filled electrical equipment, 1...Contents of transformer,
2...Transformer tank, 3...Conservator, 4...
・Cable box, 5A, 5B...Oil-gas bushing,
6A. 6B...Insulating spacer, 7...Cable terminal.

Claims (1)

[Claims] 1. A transformer tank in which two oil-immersed transformers are connected to a common terminal of a cable or a gas-insulated bus bar for parallel operation, and the oil-immersed transformers are connected to both sides of a cable box having the common terminal, and , in which the transformer tank and the common terminal are connected by a connecting duct, the contents of the transformer are connected to the common terminal by a connecting lead passing through the connecting duct, and there is a connection between the oil-immersed transformer and the common terminal. Intermediate connection ducts each partitioned by an oil-gas bushing and an insulating spacer are provided, and a water screen device is provided in the intermediate connection duct portion between the oil-immersed transformer and the cable box provided with the common terminal, and the intermediate connection duct is A split type oil-immersed transformer device characterized by having a heat detection sensor and piping for introducing fire extinguishing water inside.