CN203242482U - 66 kilovolt grounding and station transformer - Google Patents

Abstract

The utility model relates to a 66 kV grounding and station transformer, which is a single-body structure, three-phase three-column iron core, including a secondary winding and a main winding. The winding is star-connected, leading to zero phase; the secondary winding is arranged outside the iron core, and the zigzag main winding is arranged outside the secondary winding; the main winding is a cylindrical structure consisting of winding I and winding II with equal turns. Both winding Ⅰ and winding Ⅱ are equipped with taps; the main winding is led out through a capacitive bushing, phases A, B, and C are connected to a power system with a rated voltage of 66kV, and phase O is grounded through an arc suppression coil; the secondary winding is connected through a compound type The bushing is led out, and phases o, a, b, and c are connected to the power distribution system in the station. The utility model has the advantages of saving a lot of material cost, small volume, light weight, small power loss, small equipment investment, low maintenance cost, and high operating safety factor.

Description

A 66 kV grounding and substation transformer

technical field

The utility model relates to a transformer, in particular to a 66 kilovolt grounding and station transformer.

Background technique

At present, the traditional 66kV grounding transformer and the 66kV station transformer are both split types, requiring two equipment compartments and two sets of switchgears. Although it can solve the problem of 66kV system without a neutral point to install arc suppression coils, it can also solve the problem of power consumption in the station. However, the entire system occupies a large area, has large power loss, large equipment investment, high maintenance costs, and low operating safety factor, so it cannot achieve the best effect in electrical operation.

Contents of the invention

In order to overcome the deficiencies of the prior art, the purpose of this utility model is to provide a 66 kV grounding and substation transformer with small footprint, small power loss and small equipment investment.

In order to achieve the above object, the utility model is realized through the following technical solutions:

A 66 kV grounding and substation transformer with a single body structure and a three-phase three-column iron core, including a secondary winding and a main winding. The connection method leads to the zero phase; the secondary winding is arranged outside the iron core, and the meander-shaped main winding is arranged outside the secondary winding; the main winding is a cylindrical structure composed of winding I and winding II with the same number of turns, winding I and winding II are equipped with tap taps; the main winding is led out through a capacitive bushing, phase A, B, and C are connected to a power system with a rated voltage of 66kV, and phase O is grounded through an arc suppression coil; the secondary winding is led out through a composite bushing. Phases o, a, b, and c are connected to the power distribution system in the station.

Compared with the prior art, the beneficial effects of the utility model are:

Compared with the existing split-type grounding transformer and station transformer, it saves one iron core, one oil tank, three main winding bushings and part of transformer oil, which can save a lot of material cost, and is small in size, light in weight and low in power loss. , small investment in equipment, small maintenance costs, high operating safety factor.

Description of drawings

Fig. 1 is the front view of the utility model.

Fig. 2 is a top view of the utility model.

Fig. 3 is a schematic diagram of the winding arrangement structure of the present invention.

In the figure: 1-Off-excitation tap changer 2-Capacitive bushing 3-O-phase bushing 4-Compound bushing 5-Radiator 6-Pressure release valve 7-Oil drain valve 8-Gas relay 9-Oil level Count 10-oil conservator.

Detailed ways

The utility model is described in detail below in conjunction with the accompanying drawings, but it should be pointed out that the implementation of the utility model is not limited to the following embodiments.

As shown in Figures 1 to 3, a 66 kV grounding and substation transformer is a single-body structure with a three-phase three-column core, including a secondary winding and a main winding. ;The secondary winding is star-connected, leading to zero phase; the secondary winding is arranged outside the iron core, and the zigzag main winding is arranged outside the secondary winding; the main winding is a cylindrical structure, composed of winding I and winding Ⅱ composition, winding Ⅰ and winding Ⅱ are equipped with taps; the main winding is led out through the capacitive bushing 2, the phases A, B and C are connected to the power system with a rated voltage of 66kV, and the phase O is grounded through the arc suppression coil; the secondary The winding is led out through the composite bushing 4, and phases o, a, b, and c are connected to the power distribution system in the station.

Example:

The transformer adopts a single-body structure, three-phase three-column iron core, the rated voltage of the secondary winding is 0.4kV, the voltage is lower, and it is arranged close to the iron core, and the rated voltage of the zigzag main winding (ie, Z-shaped winding) is 66kV, and the voltage is higher. Arranged outside the secondary winding, effectively saving the insulation distance.

The secondary winding can adopt a cylindrical structure or a spiral structure according to the size of the capacity. The main winding adopts a cylindrical structure and consists of two parts with the same number of turns, namely, winding I and winding II. In order to meet the grid voltage fluctuation, winding I Tapping taps are set up with winding II for off-excitation voltage regulation and connected to off-excitation tap changer 1. The secondary winding is led out through the composite bushing 4 arranged on the box cover, and phases o, a, b, and c are connected to the 0.4kV power distribution system in the station; the main winding is led out through the capacitive bushing 2 arranged on the box cover, Phases A, B, and C are connected to the power system with a rated voltage of 66kV, and phase O is led out from phase O bushing 3 and grounded through the arc suppression coil.

There is a pressure relief valve 6 on the cover of the transformer box, an oil drain valve 7 on the lower side of the box body, an oil conservator 10 is connected to the transformer, a gas relay 8 is provided at the connection, and an oil level gauge 9 is arranged on the oil conservator 10 to dissipate heat. The transformer 5 is arranged on the side of the transformer.

Compared with the existing split-type grounding transformer and station transformer, the utility model saves an iron core, an oil tank, three main winding bushings and part of transformer oil, thereby saving a lot of material cost, and is small in size and light in weight.

Claims (1)

1. A 66 kV grounding and station transformer is characterized in that it is a single body structure, a three-phase three-column iron core, including a secondary winding and a main winding, and the main winding is a zigzag connection to lead out the zero phase; The secondary winding is star-connected, leading to zero phase; the secondary winding is arranged outside the iron core, and the zigzag main winding is arranged outside the secondary winding; the main winding is a cylindrical structure, consisting of winding I and winding II with the same number of turns Composition, winding Ⅰ and winding Ⅱ are equipped with taps; the main winding is led out through the capacitive bushing, A, B, C phases are connected to the power system with a rated voltage of 66kV, O phase is grounded through the arc suppression coil; the secondary winding is through The composite bushing leads out, and phases o, a, b, and c are connected to the power distribution system in the station.

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