JPH0831654A - Gas pressure regulating device of stationary induction equipemnt - Google Patents

Abstract

PURPOSE:To provide a method of simplifying a transport cover used for transporting a static induction equipment such as an oil-immersed transformer charged with insulating gas and a stationary induction equipment enhanced in insulation reliability in transit. CONSTITUTION:A transformer tank 1 is hermetially sealed up with a transport cover 2. A gas pressure regulating device 3 is composed of a gas introducing valve 5 whose one end communicates with a gas (for instance, nitrogen) bomb 5 through a piping 4 and other end communicates with the transformer tank 1 through a piping 6 and a gas discharge regulation valve 8 connected to an intermediate point of the piping 6. The transformer tank 1 is regulated inner pressure by opening or closing the control valves 7 and 8 and set to a certain pressure between an atmospheric pressure and a set pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled static induction device such as an oil-filled transformer or a reactor, and more particularly to a gas pressure adjusting device for enclosing and transporting gas.

[0002]

2. Description of the Related Art If there are restrictions on the weight and dimensions of stationary induction equipment, especially oil-immersed transformers, a transportation cover may be installed in place of the transformer product cover so that a part of the insulating oil inside the transformer may be installed. Or they are pulled out and transported. At this time, in order to prevent impurities (moisture, etc.) that have an adverse effect from entering the inside of the transformer, nitrogen gas is filled in at a pressure such that the inside of the transformer tank does not become negative pressure even when the ambient temperature decreases.

In order to prevent outside air from entering the inside of the transformer even if a slight leak occurs due to an accident during transportation, the gas filling pressure may be the lowest pressure (at the lowest ambient temperature) or the outer pressure. It is set to be higher.
In addition, the transport cover also prevents leakage of the enclosed gas,
Leak inspection is conducted strictly.

[0004]

However, in the conventional structure, (1) the transport cover is required to have the strength to withstand the maximum pressure (at the maximum ambient temperature) and the pressure for leak inspection.

(2) When gas dissolves in oil or leaks, the pressure of the enclosed gas immediately drops below atmospheric pressure.

There are problems such as the above.

The present invention has been made in view of the above points, and simplifies a transportation cover of an oil-filled transformer or the like for encapsulating and transporting an insulating gas, and improves insulation reliability during transportation. The purpose is to provide a transformer.

[0008]

In order to achieve the above object, in an oil-filled induction device of the present invention, a gas cylinder is connected to a stationary induction device via a gas pressure adjusting device at the time of transportation, and in the stationary induction device tank. The pressure of is automatically maintained between the atmospheric pressure and a preset value.

[0009]

In the configuration of the present invention, the pressure in the stationary induction device tank can be automatically maintained between the atmospheric pressure and the set value,
It is possible to simplify the transportation cover such as an oil-filled transformer that encloses and transports the insulating gas and to improve the insulation reliability during transportation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a gas pressure adjusting apparatus for a static induction device according to the present invention. In FIG. 1, a transformer tank 1 is sealed with a transportation cover 2 attached. The gas pressure adjusting device 3 includes a gas intake adjusting valve 7, one of which is connected to a gas (for example, nitrogen gas) cylinder 5 through a pipe 4 and the other of which is connected to a transformer tank 1 through a pipe 6, and an intermediate portion of the pipe 6. And a gas discharge adjusting valve 8 connected to the tank for adjusting the pressure in the tank.

Next, the operation of the gas pressure adjusting apparatus 3 of the static induction device of the present invention thus constructed will be described with reference to the operation explanatory view of FIG. In FIG. 2, (B) shows the open / close state of the adjusting valves 7 and 8. (A) shows the state of pressure inside the transformer tank 1. The left part of (A) shows the pressure fluctuation due to temperature change, and the right half shows the pressure fluctuation due to gas leakage. . Further, the solid line shows the fluctuation of the gas pressure with the adjusting device, and the broken line shows the fluctuation of the gas pressure with the conventional method (without the pressure adjusting device).

In FIG. 2, the pressure change (broken line) in the case of the conventional method in which the pressure adjusting device is not provided is that the pressure inside the transformer tank rises as the ambient temperature rises, and the transformer tank rises when the ambient temperature falls. The internal pressure drops. In this case, the pressure inside the transformer tank may rise above a set pressure (which is not set actually, but the set pressure of the embodiment), and may fall below atmospheric pressure. If there is a leak, the pressure inside the transformer tank may be lower than atmospheric pressure.

When a pressure adjusting device is provided and the upper limit pressure is set to be slightly higher than atmospheric pressure as in the present invention, the adjusting valve 7 for introducing gas and the adjusting valve 8 for releasing gas are shown in FIG. In the closed state, the internal temperature of the transformer tank 1 rises from the atmospheric pressure toward the set pressure "(a) in the figure" due to the rise of the ambient temperature.

Next, when the pressure inside the transformer tank 1 reaches the set pressure, the gas release adjusting valve 8 becomes (open) to release the gas, and the pressure is set to the set pressure "in the figure". (B) ”.

Next, when the pressure inside the transformer tank 1 becomes lower than the set pressure, the gas release adjusting valve 8 is closed and the gas intake adjusting valve 7 and the gas releasing adjusting valve are set. The state in which 8 is closed is “(c) in the figure”.

When the ambient temperature drops and the internal pressure of the transformer tank 1 falls below the atmospheric pressure, the gas intake adjusting valve 7 becomes (open) to replenish the gas and supply the transformer tank 1. The state in which the pressure inside is kept at atmospheric pressure "(d) in the figure"
become.

When the gas is replenished, the gas intake adjusting valve 7 is closed (closed) to stop the gas intake. If the ambient temperature rises with the gas intake adjusting valve 7 and the gas releasing adjusting valve 8 closed, the state in which the internal pressure of the transformer tank 1 rises becomes "(e) in the figure".

When gas leakage occurs while the gas intake adjusting valve 7 and the gas releasing adjusting valve 8 are closed, the pressure inside the transformer tank 1 drops to "(f) in the figure".

When the internal pressure of the transformer tank 1 drops below atmospheric pressure, the gas intake adjusting valve 7 becomes (open) and the gas is supplied from the gas cylinder "(g) in the figure". .

In this way, when the pressure inside the static induction device (transformer) tank exceeds the set value due to the rise in ambient temperature, the gas can be automatically discharged from the adjusting valve 8 to limit the maximum pressure inside the tank. . Also, when the pressure inside the tank drops below the atmospheric pressure due to a drop in ambient temperature or gas leakage, gas is automatically replenished. Thus, the internal pressure of the transformer tank 1 can be adjusted so as to always be maintained between the atmospheric pressure and the set pressure by opening / closing the gas intake adjusting valve 7 and the gas releasing adjusting valve 8. .

[0022]

As described above, according to the gas pressure adjusting apparatus for a static induction device of the present invention, (1) the transformer is operated by opening / closing the adjusting valve 7 for introducing gas and the adjusting valve 8 for releasing gas. The pressure inside the tank 1 can be adjusted between the atmospheric pressure and the set pressure.

(2) Compared with the conventional method, the maximum pressure inside the stationary induction device (transformer) tank is lowered to the set value, so that the strength of the transportation cover can be reduced and the transportation weight can be reduced.

(3) Since the filled gas is automatically replenished, reliability against gas leakage is improved and reliability with respect to insulation is also improved.

(4) If the capacity of the nitrogen cylinder is larger than the amount of gas leaked during the transportation period, there is no problem, and therefore the leakage inspection of the transportation cover can be simplified.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an overall configuration of an embodiment of a gas pressure adjusting device for a stationary induction device of the present invention.

FIG. 2 is an operation explanatory view showing an operation of a gas pressure adjusting device for a stationary induction device.

[Explanation of symbols]

 1 ... Transformer tank 2 ... Transport cover 3 ... Gas pressure adjusting device 4,6 ... Piping 5 ... Gas cylinder 7 ... Gas intake adjusting valve 8 ... Gas discharging adjusting valve

Claims (1)

[Claims] 1. In a stationary induction device for enclosing and transporting gas instead of insulating oil, a gas cylinder is connected to the stationary induction device via a gas pressure adjusting device during transportation, and the pressure in the stationary induction device tank is A gas pressure adjusting device for a stationary induction device, which is configured to automatically maintain between atmospheric pressure and a set value set slightly higher than atmospheric pressure.