SU1520603A1 - Water-cooled three-phase transformer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in the construction of water-cooled transformers. The purpose of the invention is to increase the cooling efficiency and increase the reliability of the device by reducing electrochemical corrosion. The device contains a winding connected in a star, a winding connected in a triangle, and an additional winding 1 connected in a star. Each phase of each of the windings is made up of two parallel branches of tubular conductors with a channel for water. In all windings, the parallel branches of each phase are electrically connected at the ends of the phases directly by a tubular conductor, preserving the water channel at both the phase ends 2 of the windings connected in a star and at both ends of the phases of the windings connected in delta or by jumpers 3 as at the zero ends windings connected in a star, and at both ends of the additional winding zero ends of the phases of the winding - the stars are connected to the collectors of input 4 and output 5, and the winding has a triangle one of the parallel branches 9 of each phase has a hydraulic 10 10, dividing the coils in a ratio of 1/3 and 2/3. At the same time, the free ends on both sides of the gap through the parallel branches of the phase of the additional winding are connected to the collectors of input 14 and output 15. The input and output in the windings are made either at the zero point for the star winding or at an artificial zero point created additional winding, thereby reducing electrochemical corrosion. 2 Il.

Description

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Full winding 1, connected to a star. Each phase of each winding is made by two parallel branches of tubular conductors with a channel for water. In all windings, the parallel branches of each phase are electrically connected at the ends of the phases directly by a tubular conductor with preservation of the water channel — both at the phase ends 2 of the winding connected in a star, and at both ends of the phases of the winding connected in delta, or by jumpers 3 — as in zero ends of the winding connected in a star, and on both ends of the additional winding zero ends of the phases of the star winding are connected to the number

The invention relates to electrical engineering, in particular, to converter technology, and can be used in transformer designs for high-power transducers with water cooling.

The purpose of the invention is to increase the cooling efficiency of the transformer and the reliability of the device by reducing the electrochemical corrosion.

The figure shows a water-cooled transformer; fig 2 is a topographic diagram of a winding connected in a triangle

The transformer (figO) has a winding connected in a star (terminals A1, B1, C1, 01), a winding connected in a triangle (terminals A2, B2, C2) and an additional winding 1 connected in a star. Each phase of each winding in a tube is made of two parallel branches of tubular conductors with a water channel. In all windings, parallel branches of each phase are electrically connected at the ends of the phases or directly with a tubular conductor, preserving the water channel as the phase ends of the windings 2, connected in star, and at both ends of the phases of the winding, connected in a triangle, or jumpers 3 as at the zero ends of the windings connected in a star, and at both ends of the additional winding. Zero ends of winding phases - stars under

to lecturers of input 4 and output 5, and in a delta winding one of the parallel branches 9 of each phase has

hydraulic gap 10, dividing the coils in the ratio of 1/3 and 2/3. At the same time, the free ends on both sides of the gap are connected through parallel branches of the phase of the additional winding to the collectors of input 14 and output 15 o. according to the star scheme, either in an artificial zero point created with the aid of an additional winding, thereby reducing the electrochemical corrosion of 2 sludge.

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connected to the collectors of inlet 4 and outlet 5 connected to the inlet pipes of inlet 6 and outlet 7 through insulating inserts 8 o At the delta winding one of the parallel branches 9 of each phase has a hydraulic discharge 10 that divides the coils in a ratio of 1/3 and 2/3 “The electrical connection between the winding parts is saved with jumper 11. Free ends on both sides of the break through insulating inserts 12 and through parallel branches 13 of the additional winding phase are connected to the collectors of input 14 and output 15 o Number of turns in the additional winding phase of 3 p aa less than the number of turns in the phase-winding phase o Phases A, B, C of the winding-triangle are connected respectively to phases c, a and b of the additional winding.

Cooling water enters the star winding conductor 16 from the zero end, passes through it to the phase end 2, acquiring a phase potential, then returns through the conductor 17, reducing its potential to the winding zero point potential. As a result, the inputs and outputs of all winding phases have the same potential - the potential of the zero point, which reduces the electrochemical corrosion of the zero point of the winding is either grounded, and if not grounded, then its potential is close to zero, and the neutral displacement is

emergency mode and time is short. The creation of a counterflow of cooling water along parallel tubular conductors leads to temperature equalization along the winding, which further increases the cooling efficiency

Additional winding 1 creates an artificial zero point 18 for a delta winding. The topographic diagram (Fig. 2) shows that the potentials of the phase ends 19 of the auxiliary winding are equal to the potentials of the connections of the delta winding to them. There is no potential difference at the ends of the chasing inserts 12 and, therefore, electrochemical corrosion of the ends of the tubular conductors. Thus, the additional winding leads to a zero potential of the places of input and output of water in the phases of the winding-triangle, which also as in the other winding, it reduces electrochemical corrosion. The backflow of water in branches x 9 and 20 equalizes the temperature along the winding, which increases the cooling efficiency.

Due to the fact that the additional winding serves only to change the potential, and the current does not flow through it, it can be made of a tubular conductor with a wall thickness less than that of a delta winding and even of a non-conducting tube. In the latter case, the need for insulating inserts 12 is eliminated

The technical and economic efficiency of the invention is determined by an increase in the efficiency of water cooling and an increase in the reliability of the device by reducing electrochemical corrosion, as well as by reducing the requirements for cooling water in terms of its electrical resistivity.

The proposed device is especially effective in transformers operating at higher frequencies.

Claims (1)

Formula invented and A three-phase transformer with water cooling, containing a magnetic conductor with primary and secondary windings, one of which is connected to a star, and the other to a triangle, a water cooling system, so that increased efficiency of cooling and reliability of the device, it is equipped with an additional winding, collectors of water inlet and outlet from the winding, insulating inserts, each phase of each of the windings are made by two parallel branches of tubular conductors with a water channel electrically connected at the ends of the phase, with the winding connected to a star, the branches are hydraulically connected at the phase ends and open at the zero ends and connected to input and output collectors water from the winding, which through, the insulating inserts are connected to the pipelines, and for the winding, connected in delta, the parallel branches are hydraulically connected to both the ends of the phases, in each phase one of the branches hydraulically has a gap, de-. the branch turns in a ratio of 1/3 and 2/3, and the free ends on both sides of the gap through insulating inserts and through parallel branches of the phase of the additional winding connected in a star are connected respectively to the input and output collectors connected to pipelines, and the free ends of the phase a of the winding connected in a triangle are connected to the parallel branches of the phase with the additional winding, and the free ends of the phases b and c respectively to the parallel branches of the phases q and b of the additional winding, the number of turns in the phase of the additional winding is 1 / 3 of the number of turns of the phase of the winding connected in a triangle Fie.2 AT 2