JPS5889812A - Foil-wound transformer - Google Patents

Abstract

PURPOSE:To quickly detect the choking in an insulator pipe and prevent troubles due to raised coil temperatures by a method wherein a bubble detector is installed on an insulator pipe located at the refrigerant outlet side of every refrigerant duct. CONSTITUTION:Every one of the insulator pipes 12' located at the outlets of regrigerant ducts 6 is provided with a bubble detector 15. A local choking in a regrigerant duct 6 or in an insulator pipe 12 located at the refrigerant inlet results in reduction in or disappearance of the quantity of the running refrigerant. Under such a condition, the temperature rises of the refrigerant, finaly causing the liquid to boil. Even a trace of refrigerant running therein generates bubbles as it boils, which arrive at a bubble detector 15 to be detected. The choking bringing about the complete stoppage of liuid flow results in a situation where bubbles under own buoyancy rise in the insulator pipe 12', to arrive at a bubble detector 15. The bubble detector 15 upon sensing a bubble warns of choking in the concerned refrigerant duct or in the insulator pipe 12 at the inlet to the concerned refrigerant duct 6.

Description

[Detailed description of the invention] Technical field to which the invention pertains This invention involves winding a foil-like member and an insulating sheet in a twisted manner: +
4 in 4 = Foil 41 pressure vessel with built-in cooling duct / Conventional technology and the company point TF! ir il t fE i! hs, *ti has the advantage of being compact compared to a high-voltage device using a --shaped conductor, but has the advantage of a higher torsion ratio and larger capacity. l#1: In order to apply this, it is necessary to improve the cooling capacity of the coil. heat generated from the body vf
IIL contact area: Constructed for cooling.

This foil 4iF pressure device made by Woodman Junmai is as shown in Figure 131.
[3] is made into a coil body, and this coil body consists of a low voltage coil (4) and a high voltage coil (5),
Each of these coil reefs has a built-in annular cooling tact (6). This lI # duct 1; is 70 pieces wing 11
Thin 9 that can be distributed with cold m tat such as 1075 in B
A gap is formed and constructed. This cold [(ff) is the pump (8)
The cool m, which has increased in temperature and is circulated by the foil-wrapped coil 4, is cooled by the cooling water of the cooler (9). Jin's l!
# The rejected coolant is further pumped into the cooling duct by the pump (8) and the refrigerant is circulated m-I! be distributed. A plurality of cooling ducts are provided in the coil, and the eight cooling ducts are connected to the S-tube U so that the refrigerant can be concentrated in and out of the inflow and outflow channels. this&
Since the liquid pipe α11 is made of metal such as stainless steel, in order to maintain insulation from the cooling duct F, the inflow and outflow 11 of each cooling duct are snipped with insulated pipes.
Together with a1 and others, it is at ground potential.

Because the potential of the cooling duct is written in the coil, it is electrically connected to the same potential as the wabo foil strip.

The entire coil is insulated in the tank C; with an insulator 041 such as sealed insulating oil or B gas.

The glue part 1 from the conductor and the bushing that pulls it out to the outside of the tank are omitted. In addition, this type of foil-wound transformer S has an optical image 6 bisected IM (
Because the transformer is separated (separated), it is particularly referred to here as a separate foil-wound transformer. This separate foil-wound transformer can be expected to have an excellent cooling mechanism, so it is promising for large-capacity transformers. However, in the conventional separate foil-wound transformer shown in Fig. 1, during long-term continuous operation, the insulating vibe 0 and the cooling duct (6), which are narrow refrigerant flow paths, (-1 Foreign matter mixed into the refrigerant can cause clogging.There is a risk of what is called a flow path closure accident.

There was some concern that such accidents could not be detected because they were localized only in some cooling ducts.

If a local crystal secondary flow path blockage occurs, the cooling force in that area will be lost, causing a local temperature rise in the coil, and eventually dielectric breakdown may occur. A pressure vessel was desired for foil sauce that could be used to check whether the flow path was closed or not.

Purpose of the Invention The present invention was developed against the background of the above-mentioned circumstances, and provides a W3 side pressure regulator that can detect localized closure of a refrigerant flow path at an early stage and identify the cooling duct in which the blockage has occurred. The purpose is to provide

Features of the Invention Even if rjIJlli occurs in the @edge pipe insulation pipe on the refrigerant outlet side of all cooling ducts, it can be detected quickly and countermeasures can be taken, thereby avoiding accidents such as coil temperature rise and dielectric breakdown caused by (). Can be done.

EXAMPLES OF THE INVENTION Below, Example 7 of the present invention*za! 2Y: Explain with quotation. In addition, the odor in Figure 2 and Figure 1 and Ichigame; the same names are used for the constituent elements, and the explanation of 7 is omitted.

A generally known air bubble detector aS, such as an ultrasonic method or a capacitance method, is installed in the insulation tube on the refrigerant outlet side of all the cooling ducts (6). If a local blockage of the refrigerant flow path occurs in the cooling duct or its refrigerant inlet side insulated pipe (13), the flow rate of the refrigerant flowing through the cooling duct decreases or stops.Then, the temperature of the refrigerant increases, and eventually Leading to boiling - If even a small amount of refrigerant is flowing, the bubbles generated by boiling will reach the bubble detector A9 and be detected, but even if there is a blockage that stops the flow of refrigerant, the bubbles generated will be buoyant. Insulated by (I) rises within aγ and reaches the bubble detector. When the bubble detector detects a bubble, a;
The detected cooling duct or the insulated vibrator (2) on the refrigerant inlet side of the cooling duct will notify you that the closure 1 has occurred, so if you stop the continuous rotation of the k pressure regulator and remove the closure t,
It is important to avoid dielectric breakdown caused by an increase in the coil ffi degree.

[Brief explanation of the drawing]

Figure 1 shows a pressure device in place of a conventional box, and Figure 2 shows a folded pressure device according to the present invention. 6...? I? -12,12'...Insulated pipe 15...Bubble detector (7317) Agent Patent attorney Kensuke Chika (and 1 others)
Figure 1 Figure 2

Claims (1)

[Scope of Claims] Foil tip part body and insulation/-) T' Inside the coil wound in a round manner 6;
~In a foil-sealed pressure device with a built-in cooling duct. Air bubbles detected in the insulated pipe on the cold outlet side of Subeni's cooling tact! ! A Hakuchi low pressure device characterized by the provision of.