JPH0495851A - Separating apparatus for gas in cable oil - Google Patents

Abstract

PURPOSE:To separate and detect gas dissolved in oil immediately after deterioration occurs by providing a gas-in-oil separator on a part where a communicating tube is bent in a right angle and further an oil circulating pump on the communicating tube. CONSTITUTION:Oil inlet ports 2,2' are provided on two upper and lower portions of a cable connection box 1, while a communicating tube 3 is connected between the ports. A circulating pump 4 which forcibly circulates insulation oil 5 in the cable connection box 1 is provided at an intermediate part of the communicating tube 3, and the insulation oil 5 is forced to circulate. When a cable or an insulator 6 in the cable connection box 6 deteriorates, gas is generated by dissolution of the insulator 6 and the gas exists in a dissolved state in the insulation oil 5. Oil containing the dissolved gas reaches a gas-in-oil separator 8 housing an oil.gas separating film 7 and a sensor 9 which is provided on a right-angled bent part of the communicating tube 3 by forced circulation by the circulating pump 4, and collision of the gas against the oil.gas separating film 7 allows the effectively separated gas to be detected by the sensor 9, thereby allowing diagnosis of deterioration in insulation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to deterioration diagnosis of oil-filled capeple.

[Conventional technology] Conventional deterioration diagnosis of oil-filled cables involves collecting oil as necessary from an oil sampling port installed in a cable connection box, etc., and taking it home to examine the gas dissolved in the oil. , for example, by analyzing with gas chromatography.

In order to collect oil, it is necessary to stop the operation of the cable line, which poses the problem that oil cannot be collected at any time. In addition, since analysis is performed after the sample is taken home, there is also the problem that deterioration diagnosis takes time.

In order to solve this problem, a method is being considered in which a device for separating gas dissolved in oil is attached to a cable connection box or the like, and the separated gas is detected by a sensor. That is, as shown in FIG. 3, insulating oil 5 filled around the insulator 6 of the cable conductor 14 in the cable junction box 1
This is a method in which the gas component ii1 [in the oil] is guided through the oil extraction port 2 to the device 8, filtered by the oil and gas separation membrane 7, and detected by the sensor 9.

[Problems to be Solved by the Invention] By the way, gas generated due to insulation deterioration of a cable or a connection box is dissolved at a high concentration in the vicinity where the deterioration occurs. This dissolved gas will spread into the oil only by diffusion, since the flow of oil is minute unless there is a large temperature change in the cable. Therefore, it takes a long time for the dissolved gas to reach the gas separation device 8 attached to the oil sampling port 2, and the concentration of the dissolved gas that has reached it is naturally lower than that at the source. For this reason, there is a problem in that it takes a long time from when deterioration occurs until it is detected.

The present invention has been made in view of these points, and aims to eliminate the drawbacks of the prior art described above and provide an improved means for quickly separating and detecting gas dissolved in oil after deterioration occurs. purpose.

[Means and effects for solving the problem] In this invention, oil extraction ports are provided at two opposing positions of the cable and the cable junction box, these are connected by a communicating pipe, and this communicating pipe is bent at a right angle. A gas-in-oil separation device is installed in the section, and an oil circulation pump is installed in the communication pipe, which forcibly circulates the insulating oil in the cable and cable junction box to the gas separation device, thereby eliminating the gas-in-oil separation device. The objective is to quickly separate and detect dissolved gases generated in the process.

Furthermore, as a drive source for the circulation pump, a through-type transformer is attached to a cable or a junction box cross-bond wire, and the secondary output is used, thereby eliminating the need for power supply wiring.

[Example] Hereinafter, the present invention will be described in detail based on the drawings. 1st
The figure is a cross-sectional view showing the configuration of an embodiment of a cable gas-in-oil separation device. That is, two oil intake ports 2 and 2' are provided at the top and bottom of the Keple junction box 1, and a communication pipe 3 is used to connect these ports. A circulation pump 4 for forcibly circulating the insulating oil 5 in the cable junction box 1 is provided in the middle of the communication pipe 3, so that the insulating oil 5 is forcibly circulated.

When the insulator 6 in the cable or cable junction box 1 deteriorates, the insulator decomposes and gas is generated, and this gas is present in the insulating oil 5 in dissolved form. Through forced circulation by the circulation pump 4, the oil containing this dissolved gas reaches the gas-in-oil separation device 8, which includes an oil/gas separation membrane 7 and a sensor 9 provided at the right-angled bend of the communication pipe 3. The gas that is efficiently separated by colliding with this oil/gas separation membrane 7 is detected by a sensor 9 to diagnose insulation deterioration.

As a power source for the drive motor that drives the circulation pump 4, a through-type transformer 12 is provided on the cable or junction box cross bond wire 11 as shown in FIG. 2, and its secondary output is driven via a stabilizing power supply device 13. By supplying the power to the morph 10, it becomes possible to eliminate the need for power supply wiring. In this case, it is effective to use the stabilized power supply 13 as a countermeasure against fluctuations in the current of the cable or the cross bond wire of the cable connection box.

[Effects of the Invention] As explained above, the cable gas-in-oil separation device of the present invention can detect insulation deterioration of oil-immersed cables more quickly and reliably than conventional devices, and can prevent accidents from occurring. be able to. Furthermore, the device is simple and the driving power source can be easily secured on site.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the configuration of a cable gas-in-oil separation device according to one embodiment of the present invention; FIG. 2 is a cross-sectional view showing the configuration of a cable gas-in-oil separation device according to another embodiment; Fig. 3 is a cross-sectional view showing the configuration of a conventional cable gas-in-oil separation device.
...Communication pipe 4...Oil circulation pump 5...
Insulating oil 6-... Insulator 7... Oil/gas separation membrane 8... Gas-in-oil separation device 9... Sensor
IO... Drive motor 11... Cable or cross bond wire 12... Penetration transformer 13...
Stabilized power supply 14... Keple conductor

Claims (2)

[Claims] (1) Provide oil sampling ports at two opposing positions on the cable and cable junction box, connect these two oil sampling ports with a communicating pipe, and place the oil in the corner of the communicating pipe bent at right angles. 1. A cable gas-in-oil separation device, comprising a gas-in-oil separation device for separating only gas from dissolved gas in the cable, and further comprising an oil circulation pump in the communication pipe. (2) The cable gas-in-oil separation device according to claim (1), wherein a through-type transformer is attached to a power cable or a junction box cross-bond wire as a driving power source for the oil circulation pump.