JPS6224926Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a low oil level relay device for a switching switch room such as an on-load tap switching device.

Recently, as substations become increasingly unmanned, reliable protection devices for electrical equipment are required. The same goes for oil-filled electrical equipment such as transformers, and a highly reliable low oil level relay device is used as a protection device for the switching switch room of the air bushing type on-load tap-changing device of the on-load tap-changing transformer. It has become required.

Fig. 1 is a side view showing an example of a low oil level relay for a changeover switch room of a conventional air bushing type on-load tap changeover device, in which a switch 1 is housed in a switch room 3 together with insulating oil 2, and the switch room 3 is insulated by a bushing 4 and placed on a transformer cover 5. Since the switch 1 is insulated by the insulating oil 2, it is necessary to monitor the oil level of the insulating oil 2 and detect a drop in the oil level. A lead wire is required to take out a signal from this detector, but since the switch room 3 is mounted on the insulated air bushing 4, the detector cannot be directly mounted on the switch room 3. For this reason, a conservator 6 for the switch room is provided at the same height as the switch room 3, separate from the switch room 3, and is connected by connecting pipes 8 and 9 via an insulating porcelain tube 7, and an oil level gauge 10 with an alarm contact is attached to the side of the conservator 6 to constitute a low oil level relay. When the oil level in the switchgear chamber 3 drops, the oil level in the conservator 6 drops, so the drop in oil level can be detected by the oil level gauge 10. Such a conventional low oil level relay has the following features: (1) The installation position of the switchgear conservator 6 is limited by insulation considerations.

(2) In order to install the oil level in the switch conservator 6 and the oil level in the switch room at the same level, a conservator stand is required, resulting in a very large-scale device.

(3) Since the insulating oil inside the insulating pipe 7 for the conservator is almost stationary, the switching switch 1
There is a risk that carbon, sludge, etc. generated when the current is switched on and off will adhere to the inner surface of the insulating tube, causing a decrease in insulation and even leading to dielectric breakdown.

There were drawbacks such as:

The object of the present invention is to eliminate such drawbacks and provide a low oil level relay device that has a simple structure and high reliability.

The present invention will be explained below with reference to the embodiments shown in FIGS. 2 and 3. FIG. 2 is a side view showing an embodiment of the present invention, and FIG. 3 is a sectional view thereof, in which the switch chamber 3 is insulated by bushings 4 and placed on the cover 5 of the transformer, as in the conventional case. There is. A float chamber 11 is connected to this switch chamber 3 via a communication pipe 12. At the bottom of the float chamber 11, there is a communication pipe 13,
Relay room 1 via insulating pipe 14 and connecting pipe 15
6 are connected, and the connecting pipes 13 and 15 are connected to the insulating pipe 14.
insulated by. The float chamber 11 is a partition wall 17
It is separated into a first float chamber 18 for the switch chamber insulating oil (contaminated oil contaminated by opening and closing of the switch) and a second float chamber 19 for the insulating oil inside the insulating pipe (clean oil). , each insulating oil is completely separated.

The switch chamber insulating oil float chamber 18 communicates with the switch chamber 3 through a communication pipe 12, and a ring-shaped first float 20 for the switch chamber is incorporated in a vertically floating state. Further, the float chamber 19 for insulating oil in the insulating pipe is communicated with the relay chamber 16 through the connecting pipe 13, the insulating pipe 14, and the connecting pipe 15, and a cylindrical second float 21 for the insulating pipe is connected.
is built into an arbitrary floating state up and down. The ring-shaped float 20 for the switch room is connected to the insulating pipe 2 via the connecting fitting 22.
3, and this insulating tube 23 passes through the insulating tube 14 and reaches the relay chamber 16. Further, the cylindrical float 21 for an insulator tube is fixed to an insulating rod 24, and this insulating rod 24 penetrates through the inside of the insulating tube 23 and reaches the relay chamber 16. The structure is such that the floats 20 and 21 respond to each oil level change, and the insulating tube 23 and the insulating rod 24 follow and respond accordingly.

Now, if the oil level drops in the switch room 3 due to oil leakage, the oil level in the switch room insulating oil float chamber 18 will also drop and the insulating pipe 23 that interlocks with the switch room ring float 20 will drop. Contacts 25 in the relay chamber 16
operates to issue an alarm and detect abnormalities. Also,
When the insulating oil inside the insulating tube leaks and the oil level drops, the insulating rod 24 interlocking with the cylindrical float 21 for the insulating tube is lowered to operate the contact 25 in the relay chamber 16 to issue an alarm and detect an abnormality.

As described above, the present invention provides a float chamber separated into two chambers, that is, a first float chamber for the insulating oil in the switch chamber and a second float chamber for the insulating oil in the insulating pipe, and each float A float that responds to changes in the oil level in the chamber is incorporated, and an insulating tube or insulating rod is attached to each float, and if the oil level drops due to oil leakage, the contact is activated by the insulating tube or insulating rod. Since a low oil level relay device is configured to detect abnormalities by detecting abnormalities, (1) there is no need for a conservator for the switch room, and there is no need for a stand for the conservator.

(2) It is small as a relay device and can be easily installed.

(3) Since the insulating oil in the switch chamber and the insulating oil in the insulating tube are completely separated by the partition wall, the insulating oil in the insulating tube is not contaminated by carbon, sludge, etc. generated when the switch switches on and off the current. This is convenient from an insulation point of view.

(4) Operation is reliable and highly reliable.

Great effects can be obtained. In addition to being used in the switch room, this device can also be used to monitor the oil level in high-voltage charging parts such as the bushing head expansion chamber.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional example, FIG. 2 is a side view showing an embodiment of the present invention, and FIG. 3 is a sectional view of the main part of FIG. 11, 18, 19...Float chamber, 12, 13, 1
5... Communication pipe, 14... Insulating pipe, 16... Relay room, 17... Bulkhead, 20, 21... Float, 23
...Insulating tube, 24...Insulating rod, 25...Contact.

Claims (1)

[Scope of utility model registration request] A float chamber is provided at a position approximately equal to the height of the switch chamber and communicates with the switch chamber, and the float chamber is separated by a partition wall, one of which is communicated with the switch chamber, and insulating oil for the switch chamber is filled. Isolating the other side from the switch room,
First and second float chambers are provided with separate insulating oil, first and second floats are provided in the first and second float chambers, and insulation is provided on the lower side of the float chamber. a relay chamber provided in communication with the second float chamber via an insulator tube; an insulated tube provided in the second float chamber and operating contacts of the relay chamber in conjunction with the first float; The second
and an insulating rod that operates in conjunction with the float of the relay chamber to operate the contacts of the relay chamber.