CN107887149B

CN107887149B - Voltage transformer for ring main unit

Info

Publication number: CN107887149B
Application number: CN201711295920.0A
Authority: CN
Inventors: 荣香倩; 邓宝爽; 于海忠; 王向富; 常青
Original assignee: Dalian No2 Instrument Transformer Group Co ltd
Current assignee: Dalian No2 Instrument Transformer Group Co ltd
Priority date: 2017-12-08
Filing date: 2017-12-08
Publication date: 2020-06-30
Anticipated expiration: 2037-12-08
Also published as: CN107887149A

Abstract

A voltage transformer for a ring main unit comprises an A-phase electromagnetic unit, a B-phase electromagnetic unit and a C-phase electromagnetic unit. A. B, C three-phase electromagnetic unit and three-phase electric capacity divide the unit once to pour into a structure once with epoxy, and epoxy pouring body is the casing, and an organic whole is connected with crank arm formula A looks lead post on the casing, B looks lead post and C looks lead post, and a structure, its characterized in that are become in casing and mounting plate connection: the A-phase electromagnetic unit, the B-phase electromagnetic unit and the C-phase electromagnetic unit have the same structure and are arranged in a delta shape. The mutual inductor provided by the invention has the advantages of reasonable design, compact structure, small volume, convenience in installation and wiring, high anti-resonance performance and high safety performance.

Description

Voltage transformer for ring main unit

Technical Field

The invention relates to the field of transformers, in particular to a voltage transformer for a ring main unit.

Background

At present, the anti-resonance performance of the voltage transformer for the ring main unit is realized by a 3+1 structure (a pure electromagnetic coil) or a neutral point with an additional resonance elimination device. The 3+1 structure is that four voltage coils are arranged in the transformer, 3N of 3 phases are connected with O of a zero phase, namely each phase bears phase voltage through two voltage packets, and the aim of anti-resonance is achieved.

By adopting the 3+1 four-coil design mode, the volume of the transformer is increased. And the mode of additionally installing the resonance eliminator additionally occupies a larger space, and the wiring is troublesome.

Disclosure of Invention

In order to overcome the defects of the voltage transformer for the ring main unit in the prior art, the invention provides the voltage transformer for the ring main unit.

The technical scheme is as follows:

a voltage transformer for a ring main unit comprises an A-phase electromagnetic unit and an A-phase capacitive voltage division unit; a B-phase electromagnetic unit and a B-phase capacitance voltage-dividing unit; a C-phase electromagnetic unit and a C-phase capacitance voltage-dividing unit. A. B, C the three-phase electromagnetic unit and the three-phase capacitance voltage-dividing unit are cast into an integral structure by epoxy resin at one time, and the epoxy resin cast body is the shell. There are turning arm formula A looks elbow type seat on the casing, B looks elbow type seat and C looks elbow type seat, and the casing is connected into an integral structure with mounting plate, its characterized in that:

the phase A electromagnetic unit, the phase B electromagnetic unit and the phase C electromagnetic unit are arranged in a delta shape. The A-phase electromagnetic unit comprises an A-phase primary voltage coil, an A-phase secondary voltage coil and an A-phase voltage iron core, wherein the A-phase secondary voltage coil is wound on the A-phase voltage iron core, and the A-phase primary voltage coil is wound on the A-phase secondary voltage iron core. The A-phase capacitor voltage divider is installed on the A-phase capacitor socket. The H end of the A-phase capacitance voltage divider is connected with the optical cap at the root of the A-phase fuse, the starting end of the A-phase primary voltage coil is connected with the A1 end of the tap of the A-phase capacitance voltage divider, and the tail end N of the A-phase primary voltage coil is connected with the tail end N end of the A-phase capacitance voltage divider and led to the primary N shared terminal. The voltage of the A-phase system is connected with the initial end H of the capacitance voltage division device through a fuse in the external elbow-shaped head device, so that the perfect combination of the A-phase capacitance voltage division and the electromagnetic unit is completed. The B-phase electromagnetic unit and the C-phase electromagnetic unit are the same as the A-phase electromagnetic unit in structure. And the other ends N of the B-phase primary voltage coil and the C-phase primary voltage coil are respectively connected with the N ends of the B-phase capacitance voltage divider and the C-phase capacitance voltage divider and then are connected together to be led to a primary N common terminal.

Two end leads of the A-phase secondary voltage coil are respectively connected with a secondary wiring terminal arranged in a secondary wiring terminal box on the outer wall of the shell.

The shell is fixedly provided with a mounting hanging ring, and a secondary cover plate is arranged outside the secondary wiring terminal box.

The invention has the advantages that:

the voltage transformer for the ring main unit provided by the invention combines the capacitive voltage division with the electromagnetic element, so that the voltage transformer is in a capacitive type, and has the advantages of reasonable design, compact structure, small volume, convenience in installation and wiring, high anti-resonance performance and high safety performance.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of FIG. 1;

fig. 3 is a top view of fig. 1.

The specific implementation mode is as follows:

a voltage transformer for a ring main unit comprises an A-phase electromagnetic unit 1 and an A-phase capacitance voltage division unit; a B-phase electromagnetic unit 2 and a B-phase capacitance voltage division unit; a C-phase electromagnetic unit 3 and a C-phase capacitance voltage division unit. A. B, C the three-phase electromagnetic unit and the three-phase capacitance voltage-dividing unit are cast into an integral structure by epoxy resin at one time, and the epoxy resin cast body is the shell 4. A phase A elbow type seat 5, a phase B elbow type seat 6 and a phase C elbow type seat 7 are integrally connected on the single shell 4, and the shell and the mounting bottom plate 8 are connected into an integral structure, which is characterized in that:

the A-phase electromagnetic unit 1, the B-phase electromagnetic unit 2 and the C-phase electromagnetic unit 3 are arranged in a delta shape. The A-phase electromagnetic unit comprises an A-phase primary voltage coil 9, an A-phase secondary voltage coil 10, an A-phase voltage iron core 11 and an A-phase capacitive voltage divider 12, wherein the A-phase secondary voltage coil is wound on the A-phase voltage iron core, and the A-phase primary voltage coil 9 is wound on the A-phase secondary voltage coil 10. The phase A capacitor divider 12 is installed on the phase A capacitor socket 13, the H end of the phase A capacitor divider is connected with the optical cap 14 at the root of the phase A fuse, the starting end of the phase A primary voltage coil is connected with the A1 end of the phase A capacitor divider tap, and the tail end N of the phase A primary voltage coil is connected with the tail end N of the phase A capacitor divider and is led to the primary N common terminal 21. The A-phase system voltage is connected with the initial end H of the capacitance voltage division device through a fuse in the external elbow-shaped head 15 device.

The phase B electromagnetic unit 2, the phase B capacitive voltage divider 16, the phase C electromagnetic unit 3 and the phase C capacitive voltage divider 17 are identical in structure to the phase A electromagnetic unit 1 and the phase A capacitive voltage divider 12. The other ends of the A-phase primary voltage coil, the B-phase primary voltage coil and the C-phase primary voltage coil are respectively connected with the N ends of the A-phase capacitance voltage divider 12, the B-phase capacitance voltage divider 16 and the C-phase capacitance voltage divider 17 and then connected together and are connected with the grounding bolt 18 through a lead.

And a mounting lifting ring 19 is fixed on the shell 4, and a secondary cover plate 20 is arranged outside the secondary wiring terminal box.

Claims

1. A voltage transformer for a ring main unit comprises an A-phase electromagnetic unit (1) and an A-phase capacitive voltage-dividing unit (12); a B-phase electromagnetic unit (2) and a B-phase capacitive voltage-dividing unit (16); a C-phase electromagnetic unit (3) and a C-phase capacitive voltage-dividing unit (17); A. b, C the three-phase electromagnetic unit and the three-phase capacitance voltage division unit are poured into an integral structure by epoxy resin at one time, and the epoxy resin poured body is the shell (4); there are A looks elbow type seat (5) on casing (4), B looks elbow type seat (6) and C looks elbow type seat (7), and casing (4) are connected into an organic whole structure, its characterized in that with mounting plate (8):

the phase A electromagnetic unit comprises a phase A primary voltage coil (9), a phase A secondary voltage coil (10), a phase A voltage iron core (11) and a phase A capacitive voltage divider (12), wherein the phase A secondary voltage coil is wound on the phase A voltage iron core, and the phase A primary voltage coil (9) is wound on the phase A secondary voltage coil (10); the A-phase capacitor voltage divider (12) is arranged on the A-phase capacitor socket (13), the H end of the A-phase capacitor voltage divider is connected with a light cap (14) at the root of an A-phase fuse, the initial end of an A-phase primary voltage coil is connected with the A1 end of a tap of the A-phase capacitor voltage divider (12), the tail end N of the A-phase primary voltage coil is connected with the tail end N end of the A-phase capacitor voltage divider (12) and is led to a primary N common terminal (21);

the phase B electromagnetic unit (2), the phase B capacitive voltage divider (16), the phase C electromagnetic unit (3) and the phase C capacitive voltage divider (17) are identical to the phase A electromagnetic unit (1) and the phase A capacitive voltage divider (12) in structure;

the tail ends of the A-phase primary voltage coil, the B-phase primary voltage coil and the C-phase primary voltage coil are respectively connected with the N ends of the A-phase capacitance voltage divider (12), the B-phase capacitance voltage divider (16) and the C-phase capacitance voltage divider (17) and then connected together and connected with a grounding bolt (18) through a wire;

two end leads of the A-phase secondary voltage coil are respectively connected with a secondary wiring terminal in a secondary wiring terminal box arranged on the outer wall of the shell.

2. The voltage transformer for the ring main unit as claimed in claim 1, wherein the shell (4) is fixed with a mounting ring (19).

3. The voltage transformer for ring main unit as claimed in claim 1, wherein the secondary connection terminal box is externally provided with a secondary cover plate (20).