JP6425867B1 - Stationary induction equipment - Google Patents

Abstract

The upper pipe (14) connects the upper portion of the tank (10) and the upper portion of the radiator (12). The connecting pipe (22) connects the upper portion of the tank (10) to the conservator (20). The first bypass (30) extends upward from the portion on the tank (10) side from the oil pump (18) of the upper pipe (14), and the tank (10) side from the relay (24) of the connecting pipe (22) Connected to the part of. The second bypass (40) connects the first bypass (30) and a portion of the connecting pipe (22) closer to the conservator (20) than the relay (24) or the consorbeta (20). The narrowed portion (32) is provided closer to the connection pipe (22) than a connection portion (36) of the first bypass (30) and the first bypass (30) and the second bypass (40).

Description

  The present invention relates to a static induction device, and more particularly to a static induction device equipped with a relay.

  As a prior art document which disclosed the structure of the static induction apparatus provided with the relay, there exists Unexamined-Japanese-Patent No. 53-23031 (patent document 1). The transformer, which is a stationary induction device described in Patent Document 1, connects the upper and lower portions of the transformer main body and the common oil conductor of the upper and lower portions of the radiator via oil transmission pipes, and attaches a pump to the oil transmission pipe at the lower part The relay attached to the piping attached to the upper part of the transformer body. Further, the transformer main body side of the above-described piping relay and the common oil conducting side of the upper portion are communicated by a bypass pipe.

  In the transformer described in Patent Document 1, the pressure fluctuation occurs in the radiator when the oil feeding pump is started by attaching the bypass pipe, but the pressure fluctuation does not reach the relay. This is to prevent the malfunction of the relay.

JP-A-53-23031

  In the transformer described in Patent Document 1, the oil pump is attached to the lower pipe, but the oil pump may be attached to the upper pipe. In this case, since the pressure fluctuation at the start of the oil pump passes through the bypass pipe via the common oil conduit at the top of the radiator and is transmitted to the relay, the bypass pipe is not the upper common oil conduit but the upper pipe It is connected to the part on the transformer main body side than the oil pump.

  However, in the transformer in which the arrangement of the oil pump and the connection position of the bypass pipe are deformed as described above, the cooling oil is relayed from the upper pipe through the bypass pipe due to the water hammer phenomenon generated when the oil pump stops. Flow into As a result, the relay erroneously detects an abnormality even though no abnormality has occurred in the transformer.

  The present invention has been made in view of the above problems, and is provided with an oil pump in the upper pipe, and is capable of suppressing false detection of a relay by each oil flow at the start and stop of the oil pump. It aims to provide an induction device.

  The static induction device according to the present invention includes a tank, a radiator, an upper pipe, a lower pipe, an oil pump, a consaver, a connecting pipe, a relay, a first bypass, a second bypass, and a throttle portion. And The tank is filled with cooling oil and contains the static induction device main body. The radiator cools the cooling oil. The upper piping connects the upper portion of the tank and the upper portion of the radiator. In the upper piping, cooling oil flows from the tank to the radiator. The lower piping connects the lower part of the tank and the lower part of the radiator. In the lower piping, cooling oil flows from the radiator to the tank. The oil pump is installed in the upper pipe. The oil pump circulates the cooling oil between the tank and the radiator. The Conservator is located above the tank. A connecting pipe connects the upper portion of the tank to the conservator. The relay is installed in the connection pipe. The first bypass extends upward from the portion on the tank side of the oil pump in the upper pipe, and is connected to the portion on the tank side of the relay of the connection pipe. The second bypass connects the first bypass to a portion on the conservator side of the connecting tube relay or to the consorter. The throttling portion is provided on the connection pipe side of the connection portion between the first bypass and the second bypass of the first bypass.

  According to the present invention, in the stationary induction device including the oil pump in the upper pipe, the second bypass and the throttling portion prevent the oil flow at start and stop of the oil pump from flowing into the relay. Erroneous detection of the relay can be suppressed.

It is a systematic diagram which shows the flow of the cooling oil at the time of the normal driving | running of a structure of the static induction apparatus which concerns on Embodiment 1 of this invention, and a static induction apparatus. FIG. 5 is a system diagram showing the flow of gas when a minor accident occurs in the stationary induction device according to Embodiment 1 of the present invention. FIG. 5 is a system diagram showing the flow of cooling oil when a major accident occurs in the stationary induction device according to Embodiment 1 of the present invention. FIG. 6 is a system diagram showing a flow of cooling oil when a water hammer phenomenon occurs when the oil pump is stopped in the stationary induction device according to Embodiment 1 of the present invention. The stationary induction machine apparatus which concerns on the modification of Embodiment 1 of this invention WHEREIN: It is a systematic diagram which shows the flow of the cooling oil when a water hammer phenomenon generate | occur | produces. It is the elements on larger scale which show the structure of the 1st bypass of the static induction instrument which concerns on Embodiment 2 of this invention. It is the elements on larger scale which show the structure of the 1st bypass of the modification of the stationary induction machine apparatus which concerns on Embodiment 2 of this invention.

  Hereinafter, a static induction device according to each embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding portions in the drawings are denoted by the same reference characters, and the description thereof will not be repeated.

Embodiment 1
FIG. 1 is a system diagram showing the configuration of a static induction device according to Embodiment 1 of the present invention and the flow of cooling oil during normal operation of the static induction device. FIG. 2 is a system diagram showing the flow of gas when a minor accident occurs in the stationary induction device according to Embodiment 1 of the present invention. FIG. 3 is a system diagram showing the flow of cooling oil when a major accident occurs in the stationary induction device according to Embodiment 1 of the present invention. FIG. 4 is a system diagram showing the flow of the cooling oil when the water hammer phenomenon occurs when the oil pump is stopped in the stationary induction device according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the stationary induction device 100 according to the first embodiment of the present invention includes a tank 10, a radiator 12, an upper pipe 14, a lower pipe 16, an oil pump 18, and a conservator 20. A connection pipe 22, a relay 24, a first bypass 30, a second bypass 40, and a throttle portion 32 are provided.

  The tank 10 is filled with a cooling oil 50 and accommodates a static induction device main body (not shown). The stationary induction device body is cooled by the cooling oil 50. The stationary induction device body is a transformer or a reactor.

  The radiator 12 cools the cooling oil 50 whose temperature has risen by cooling the static induction device main body. In the present embodiment, the radiator 12 is air-cooled.

  The upper pipe 14 connects the upper portion of the tank 10 and the upper portion of the radiator 12. In the upper pipe 14, the cooling oil 50 whose temperature has risen by cooling the static induction device main body flows from the tank 10 to the radiator 12.

  In the present embodiment, the upper pipe 14 is connected to the upper end surface of the tank 10 and connected to the upper end surface of the radiator 12. The inner diameter of the upper pipe 14 is approximately 6 inches to 8 inches.

  The lower pipe 16 connects the lower portion of the tank 10 and the lower portion of the radiator 12. In the lower pipe 16, the cooling oil 50 cooled by the radiator flows from the radiator 12 to the tank 10.

  The oil pump 18 is installed in the upper pipe 14 and circulates the cooling oil 50 between the tank 10 and the radiator 12 as shown in FIG. 1.

  The condenser 20 is located above the tank 10. Cooling oil 50 is filled in the interior of the condenser 20, and an air bag (not shown) is accommodated.

  The connection pipe 22 connects the upper portion of the tank 10 and the consaver 20. While the stationary induction device 100 is operating normally, the cooling oil 50 flows through the inside of the connection pipe 22 according to the temperature change of the cooling oil 50. The connecting pipe 22 is disposed to be inclined upward as it goes from the tank 10 to the consor beta 20. In the present embodiment, the inner diameter of the connection pipe 22 is approximately 3 inches.

  The relay 24 is installed in the connection pipe 22. The relay 24 has a function of protecting the stationary induction device 100 by detecting an internal accident of the stationary induction device 100. In the present embodiment, the relay 24 is a Buchholtz relay. A specific method of detecting an accident by the relay 24 will be described later.

  The first bypass 30 extends upward from the portion of the upper pipe 14 closer to the tank 10 than the oil pump 18, and is connected to the portion of the connecting pipe 22 closer to the tank 10 than the relay 24.

  The narrowed portion 32 is provided closer to the connection pipe 22 than a connection portion 36 of the first bypass 30 and the second bypass 40 described later. In the first bypass 30, the throttling portion 32 increases the pressure loss of the cooling oil 50. In the present embodiment, the throttling portion 32 is an orifice, and the inner diameter of the orifice is approximately 1/20 inch. The throttling portion 32 is not limited to the orifice, and may have a function of throttling the first bypass 30.

  In the present embodiment, the first bypass 30 has the expanded pipe portion 34 on the upper pipe 14 side of the narrowed portion 32. As shown in FIG. 1, the expanded pipe portion 34 is formed of a pipe whose inner diameter is larger than that of the other portion of the first bypass 30. Further, the shape of the expanded portion 34 is a square tube. The shape of the expanded portion 34 is not limited to a square tube, and may be a circular tube.

  The expanded pipe portion 34 has a function of guiding the gas generated when a minor accident occurs to the throttling portion 32. Specifically, the gas is separated from the cooling oil 50 flowing through the upper pipe 14 and directed to the throttle portion 32. It is preferable that the volume above the connection part 36 of the expanded tube part 34 is more than the volume amount of gas required for the relay 24 to detect a minor accident.

  The second bypass 40 connects the first bypass 30 and a portion of the connecting pipe 22 closer to the conservator 20 than the relay 24 or the consorter 20. The second bypass 40 is arranged to be positioned horizontally or upward as it goes from the first bypass 30 to the condenser 20.

  In the present embodiment, the second bypass 40 connects the first bypass 30 and the portion of the connecting pipe 22 closer to the conservator 20 than the relay 24, and the inner diameter of the second bypass 40 is approximately 3 inches. It is.

  In the present embodiment, the connection portion 36 of the first bypass 30 and the second bypass 40 of the first bypass 30 is located below the upper end of the expanded pipe portion 34. Specifically, the second bypass 40 is connected to the expanded tube portion 34, and the connection portion 36 is located on the side surface of the square tube that constitutes the expanded tube portion 34. Since the connection portion 36 is positioned as described above, the gas generated when a minor accident occurs is separated from the cooling oil 50 flowing into the second bypass 40 above the connection portion 36 of the expanded pipe portion 34. Can. The second bypass 40 may be connected to a first bypass lower pipe 38 described later.

  The first bypass 30 further includes a first bypass lower pipe 38 connecting the upper pipe 14 and the expanded pipe portion 34. Specifically, the first bypass lower pipe 38 is connected to the lower end surface of the expanded portion 34, and the inner diameter of the first bypass lower pipe 38 is approximately 1 inch. The inner diameter of the portion other than the narrowed portion 32 in the portion connecting the expanded pipe portion 34 of the first bypass 30 and the connection pipe 22 is also approximately 1 inch.

  Hereafter, with reference to FIG. 2 and FIG. 3, when an accident generate | occur | produces inside a static induction instrument, the process until it operates the relay 24 is demonstrated.

  As shown in FIG. 2, when the gas 60 is generated due to a minor accident of the static induction device main body housed in the tank 10, a part of the gas 60 flows into the connection pipe 22 and reaches the relay 24, and Another part of 60 flows into the upper pipe 14. The gas 60 that has flowed into the upper pipe 14 further flows into the upper portion of the expanded pipe portion 34 located above the connection portion 36 via the first bypass lower pipe 38.

  The gas 60 flowing into the upper portion of the expanded pipe portion 34 flows into the relay 24 via the throttling portion 32. Then, when the total volume of the gas 60 flowing into the relay 24 exceeds the threshold value, the relay 24 operates to detect the occurrence of a minor accident.

  As shown in FIG. 3, when a major accident occurs in the static induction device main body accommodated in the tank 10, the heat-expanded cooling oil 50 flows into each of the connection pipe 22 and the upper pipe 14. The cooling oil 50 that has flowed into the upper pipe 14 flows into the expanded pipe portion 34 via the first bypass lower pipe 38. Since the throttling portion 32 is provided above the expanded pipe portion 34 of the first bypass 30, the cooling oil 50 flowing into the expanded pipe portion 34 is more concentrated than the relay 24 of the connecting pipe 22 via the second bypass 40. It flows into the beta 20 side and finally into the conservator 20. That is, the cooling oil 50 which has flowed into the upper pipe 14 flows into the conditioner 20 without passing through the relay 24.

  However, since the flow rate of the cooling oil 50 flowing from the tank 10 into the relay 24 via the connection pipe 22 is very large when the above-mentioned major accident occurs, the relay 24 operates by the inflow of the cooling oil 50. Can detect the occurrence of a major accident.

  The flow of the cooling oil 50 when the oil pump 18 is stopped will be described below with reference to FIG.

  As shown in FIG. 4, when the oil pump is stopped, the water hammer phenomenon occurs in the upper pipe 14, and the cooling oil 50 which was present on the tank 10 side of the oil pump 18 of the upper pipe 14 is the first It flows into the expanded portion 34 via the bypass lower pipe 38.

  Then, since the throttling portion 32 is provided above the expanded pipe portion 34 of the first bypass 30, the cooling oil 50 which has flowed into the expanded pipe portion 34 is connected to the connection pipe 22 from the connecting portion 36 via the second bypass 40. The relay 24 flows into the conservator side rather than the relay 24 and finally flows into the conservator 20.

  Therefore, even when the water hammer phenomenon occurs when the oil pump 18 is stopped, the relay 24 can be prevented from flowing the cooling oil 50 more than the threshold necessary for the relay 24 to operate. It is possible to suppress false detection of an accident.

  Since the stationary induction device according to the present embodiment includes the throttling portion 32 and the second bypass 40, it is possible to suppress the pressure fluctuation when the oil pump 18 is activated from reaching the relay 24. Therefore, it can suppress that the relay 24 misdetects an accident by the pressure fluctuation at the time of starting the oil pump 18. FIG.

  As described above, the stationary induction device 100 according to the present embodiment includes the throttling portion 32 and the second bypass 40, thereby providing the upper pipe 14 with the oil pump 18, while starting and stopping the oil pump 18. It can suppress that the relay 24 misdetects by the flow of each cooling oil 50 at the time.

  Further, the first bypass 30 has the expanded portion 34 on the upper pipe 14 side of the narrowed portion 32, and the connection portion 36 between the first bypass 30 and the second bypass 40 is located below the upper end of the expanded portion 34. Thus, the gas generated due to a minor accident inside the stationary induction device 100 is prevented from flowing into the second bypass 40 without passing through the relay 24. Therefore, false detection of the relay 24 can be suppressed without impairing the original function of the relay 24 that detects a minor accident.

  If the volume above the connection portion 36 of the expanded portion 34 is equal to or greater than the volume amount of gas necessary for the relay 24 to detect a small accident, the gas generated in the small accident can be efficiently relayed. It is possible to prevent the detection failure of the minor accident of the relay 24.

  FIG. 5 is a system diagram showing the flow of the cooling oil when the water hammer phenomenon occurs in the stationary induction device according to the modification of the first embodiment of the present invention. As shown in FIG. 5, in the stationary induction device 100 a according to the present modification, the second bypass 40 a connects the first bypass 30 and the consor beta 20 to each other.

  Even when the water hammer phenomenon occurs when the oil pump is stopped in the present modification, the cooling oil 50 is supplied via the first bypass lower pipe 38, the expanded pipe portion 34, and the second bypass 40a to the conservator 20. Therefore, the relay 24 can be prevented from erroneously detecting an accident.

Second Embodiment
The stationary induction device according to the second embodiment will be described below. The static induction device according to the second embodiment of the present invention differs from the static induction device 100 according to the first embodiment of the present invention only in the shape of the expanded tube portion. Therefore, the static induction device 100 according to the first embodiment of the present invention The description will not be repeated for the configuration that is the same as the above.

  FIG. 6 is a partial enlarged view showing a configuration of a first bypass of the static induction device according to Embodiment 2 of the present invention.

  In the present embodiment, the expanded pipe portion 34a includes a portion which is expanded gradually from the upper end downward. As shown in FIG. 6, the longitudinal cross section of the expanded tube portion 34 a in the present embodiment has a substantially triangular shape with the upper end as a vertex. That is, the expanded tube portion 34a has a substantially conical or pyramidal shape. Since the expanded tube portion 34a has such a shape, the gas flowing into the upper portion of the expanded tube portion 34a can be easily sent to the narrowed portion 32, so that the gas is prevented from staying in the expanded tube portion 34a. Thus, the small accident detection performance of the relay 24 can be maintained high.

  FIG. 7 is a partially enlarged view showing a configuration of a first bypass of a modification of the static induction device in accordance with Embodiment 2 of the present invention. As shown in FIG. 7, in the static induction device according to the present modification, the shape of the upper portion of the longitudinal cross section of the expanded tube portion 34b is an arc shape. That is, the upper portion of the expanded portion 34b has a substantially hemispherical shape. The throttling portion 32 is located immediately above the top of the hemispherical shape.

  Also in this modification, since the expanded tube portion 34b has such a shape, the gas flowing into the upper portion of the expanded tube portion 34b can be easily sent to the narrowed portion 32, so that the gas in the expanded tube portion 34b Can be suppressed, and the detection performance of the minor accident of the relay 24 can be maintained high.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of a limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-mentioned embodiment, and is defined based on the statement of a claim. In addition, all changes within the meaning and range equivalent to the scope of claims are included.

Reference Signs List 10 tank, 12 radiator, 14 upper pipe, 16 lower pipe, 18 oil pump, 20 conservator, 22 connection pipe, 24 relay, 30 first bypass, 32 throttle part, 34, 34a, 34b pipe expansion part, 36 connection part, 38 1st bypass lower piping, 40, 40a 2nd bypass, 50 cooling oil, 60 gas, 100, 100a static induction equipment.

Claims (3)

A tank filled with a cooling oil for containing a static induction device main body;
A radiator for cooling the cooling oil;
An upper pipe connecting the upper portion of the tank and the upper portion of the radiator and flowing the cooling oil from the tank to the radiator;
A lower pipe connecting the lower portion of the tank and the lower portion of the radiator, and the cooling oil flowing from the radiator to the tank;
An oil pump installed in the upper pipe and circulating the cooling oil between the tank and the radiator;
A conservator located above the tank;
A connecting pipe for connecting the upper portion of the tank and the conservator;
A relay installed in the connection pipe;
A first bypass extending upward from a portion of the upper pipe on the tank side of the oil pump and connected to a portion of the connection pipe on the tank side of the relay;
A second bypass that connects the first bypass and a portion of the connection pipe closer to the conservator side than the relay or the conservator;
A stationary induction device, comprising: a throttling portion provided closer to a connection pipe than a connection portion between the first bypass and the second bypass of the first bypass. The first bypass has an expanded portion on the upper pipe side of the narrowed portion,
The stationary induction device according to claim 1, wherein the connection portion is located below an upper end of the expanded tube portion.   The stationary induction device according to claim 2, wherein the expanded tube portion includes a portion which gradually expands from the upper end downward.

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