JPH0582017U - Oil leak detector for oil-filled electrical equipment - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to correctly detect oil leakage in oil-filled electrical equipment using a float. [Constitution] A float chamber is provided in the main pipe connected to the upper part of the case of the oil-filled electric device, and the float is provided inside the float chamber. A place lower than the top of the main pipe and the bottom of the float chamber should be connected. When decomposed gas is generated inside the equipment case, the decomposed gas does not enter the inside of the float chamber through the top of the main pipe. This prevents the float from sinking due to decomposition gas and avoids false detections.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil leak detection device for oil-filled electrical equipment.

[0002]

[Prior Art]

 In oil-filled electrical equipment such as oil-filled transformers and oil-filled reactors, oil leakage may occur due to damage to the equipment case or insulator due to external factors, and a float is used to detect this. Has been. In order to increase the detection sensitivity of the normal float, it is installed in the float chamber provided in the middle of the main piping from the upper part of the equipment case to the heat dissipation device and the oil amount adjusting device.

According to this, when an oil leak occurs, the oil level in the main pipe lowers, and the float in the float chamber sinks. Therefore, the occurrence of oil leak can be detected from this sinking. Like

On the other hand, in the oil-filled electrical equipment, when a thermal abnormality occurs in the equipment, the heat may cause decomposition gas to be generated from the insulating oil. When the decomposed gas thus generated enters the float chamber from the upper part of the equipment case through the main piping, the oil level in the float chamber is pushed by the invaded decomposed gas and the float sinks. Therefore, even if no oil leak has occurred, it will be erroneously detected as if an oil leak had occurred.

[0005]

[Problems to be solved by the device]

 The purpose of the present invention is to enable accurate detection of oil leakage in oil-filled electrical equipment.

[0006]

[Means for Solving the Problems]

 According to the present invention, a float chamber communicating with the main pipe is provided in the main pipe connected to the upper part of the equipment case, and the float is arranged inside the float chamber. It is characterized in that a communication part is provided to communicate with the bottom part of the, and the main pipe and the float chamber are communicated with each other through this communication part.

[0007]

[Action]

 When the insulating oil flows from the equipment case to the main pipe, the insulating oil flows into the float chamber provided in the main pipe through the communication part. Therefore, when an oil leak occurs, the oil level in the float chamber lowers and the float sinks, so that the oil leak can be detected. When decomposed gas is generated, it flows through the top of the main pipe, so the decomposed gas does not enter the float chamber through the communication part located below the top. This avoids erroneous detection of oil leakage.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a device case in which an oil-filled electric device is stored inside together with insulating oil, and 2 is a main pipe led out from the upper part of the device case 1, which includes a heat dissipation device 3 and an oil amount adjusting device (conservator) 4 Are linked to. Reference numeral 5 is a contact for detecting abnormal bulging when the oil amount adjusting device 4 is constituted by a metal bellow, and 6 is a valve.

A float chamber 7 is installed in the upper part of the main pipe 2 in the middle thereof, and a float 8 is provided inside thereof. Although the float chamber 7 and the main pipe 2 are communicated with each other, according to the present invention, a portion lower than the top of the main pipe 2 and the bottom of the float chamber 7 are communicated with each other.

In the embodiment shown in FIG. 2, a small hole 9 is provided in a side wall located at a position lower than the top of the main pipe 2 and located at the bottom of the float chamber 7 and serves as a communication part. In the embodiment shown in FIG. 3, the small tube 10 is inserted into a portion corresponding to the position of the small hole 9 described above, and this is used as a communicating portion. Reference numeral 11 is insulating oil in the main pipe 2 and the float chamber 7.

The insulating oil flowing in the main pipe 2 flows into the float chamber 7 through the small holes 9 or the small pipes 10. The float 8 floats due to the insulating oil that has entered the float chamber 7. When the insulating oil maintains a predetermined amount, it remains stationary at a certain floating position. When the amount of insulating oil in the main pipe 2 decreases due to oil leakage or the like, the float 8 sinks, so that it is detected that oil leakage has occurred.

When decomposed gas is generated due to the occurrence of a thermal abnormality of the equipment, the decomposed gas passes through the main pipe 2 together with the insulating oil, but the decomposed gas is light and passes near the top of the main pipe 2. Therefore, the float chamber 7 does not enter through the small hole 9 or the small tube 10. As a result, unlike the conventional case, the oil level in the float chamber 7 is not lowered by the decomposed gas, and erroneous detection such as oil leakage is avoided.

[0013]

[Effect of the device]

 As described above, according to the present invention, when the float is used for oil leak detection, erroneous detection due to decomposed gas can be reliably avoided.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing an embodiment of the float chamber of the present invention.

FIG. 3 is an enlarged sectional view showing another embodiment of the float chamber of the present invention.

[Explanation of symbols]

 1 Equipment Case 2 Main Pipe 3 Heat Dissipation Device 4 Oil Volume Adjustment Device 7 Float Chamber 8 Float 9 Small Hole (Communication Portion) 10 Small Pipe (Communication Portion)

Claims (1)

[Scope of utility model registration request] 1. An oil-filled electrical device in which a main pipe is connected to an upper part of a device case accommodating an oil-filled electrical device together with insulating oil, a float chamber is provided in the main pipe, and a float is arranged inside the float chamber. In the oil leakage detection device, a communication part that communicates with a portion lower than the top of the main pipe and the bottom of the float chamber is provided, and an oil container formed by communicating the main pipe and the float chamber via the communication part. Oil leak detector for electrical equipment.