CN2689418Y

CN2689418Y - 220 KV single-phase railway tracting transformer body structure

Info

Publication number: CN2689418Y
Application number: CN 200420001195
Authority: CN
Inventors: 高德满; 马旭平; 解江伟
Original assignee: Tebian Electric Apparatus Stock Co Ltd
Current assignee: Tebian Electric Apparatus Stock Co Ltd
Priority date: 2004-01-19
Filing date: 2004-01-19
Publication date: 2005-03-30
Anticipated expiration: 2014-01-19

Abstract

The utility model relates to a 220 kV single-phase railway tracting transformer body structure, mainly comprising an iron-core (1), a high-voltage coil (2), a low-voltage coil (3), etc. the electric voltages at the head terminal (4) and the end terminal (5) of the high-voltage coil are both 220 kV, so that the head terminal (4) and the end terminal (5) of the high-voltage coil can be directly connected with a 220 kV electric network; interleaved equal winding is adopted for the head terminal (4) and the end terminal (5) of the high-voltage coil, and continuous winding is adopted for the other coil segments; the outlet head of a tapping section is positioned at the longitudinal 1/2 site of the high-voltage coil (2). The 220 kV single-phase railway tracting transformer body structure has more powerful anti short-circuit capacity, and the line loss of traction electric supply can be greatly reduced, and consequently, the operating cost and the transform equipment can be saved for substations.

Description

The single-phase railway traction transformer machine body structure of a kind of 220kV level

Technical field:

The utility model relates to a kind of traction transformer, particularly a kind of single-phase railway traction transformer.

Background technology:

China railways traction circuit is 27.5kV to the voltage of track, is generally 110kV or 220kV for the supply voltage of the three-phase electrical power system of traction line powering.At present, the employed traction transformer of China railways traction circuit is the 110kV electric pressure, and the line loss of 110kV level traction transformer power transformation operation is very big.At present, 220kV level railway traction transformer is to be 110kV voltage with earlier the 220kV electric pressure being utilized common power transformer transformation earlier, connects the voltage of the traction transformer output 27.5kV of 110kV electric pressure again, and operating cost is very high.Along with improving constantly of China railways electrifing degree, the electric railway technical merit also improves constantly, and the working line loss is required also more and more strictness, requires loss very low, therefore presses for a kind of traction transformer that is complementary with the 220kV electrical network.Because the high side voltage of 220kV single-phase traction transformer is 220kV, electric pressure is higher, how to guarantee that therefore the dielectric strength of 220kV single-phase traction transformer and anti-short circuit capability are the bottleneck problems that troubles the development of 220kV single-phase traction transformer always.

Summary of the invention:

The utility model is the above-mentioned defective at prior art, and a kind of 220kV level single-phase traction transformer is provided, and can solve defectives such as 110kV traction transformer line loss is big, converting equipment is many, has reliable dielectric strength and extremely strong anti-short circuit capability.

The technical solution of the utility model is: the single-phase railway traction transformer machine body structure of a kind of 220kV level, it mainly partly is made up of iron core, high-tension coil, low-voltage coil etc., the first and last end of its high-tension coil is circle coilings such as adopting the formula of being entangled with, and other line segments of high-tension coil adopt the continous way coiling.The tap section of high-tension coil and low-voltage coil is lifted one's head and is positioned at coil 1/2 place longitudinally.

Accompany static board between high-tension coil head end and high-tension coil end and end circle, the interlayer symmetry at high-tension coil first and last end and core insulation is placed with the positive square ring in three roads, one dihedral ring simultaneously;

The end outlet of high-tension coil is by the coated shielding of aluminium foil, and aluminium foil layer is coated electric insulation crimped paper outward, the coated two-layer corrugated board of outermost layer;

The device body adopt to press nail to compress, press and place three layers of packing ring between nail and the pressing plate, between device body bottom folder oil guiding box and the lower oil tank oil guiding box employing wedge positive and negative cooperate urgent.

The utility model is the single-phase railway traction transformer of 220kV level, as the traction transformer of electrified railway power supply, has stronger insulation characterisitic and anti-short circuit capability.Its major advantage is: 1, can be directly and the electrical network of 220kV level be complementary, its output voltage is 27.5kV, just in time press for power for traction, and need not earlier the 220kV electric pressure be utilized common power transformer to become the 110kV electric pressure earlier, the voltage that connects the traction transformer output 27.5kV of 110kV electric pressure again, for traction substation, can save a step-down transformer; 2, since the device body with pressing nail to compress, pressing plate adopts certain thickness laminated wood to make, and guarantees the axial pressing force of coil, device body bottom is urgent with wedge, so it resists frequent short circuit and running overload ability strong; Under the 110% excitation effect, transformer can move continuously, so its overexcited operation ability is strong during 3, owing to full load 105% excitation and zero load.

Description of drawings:

Fig. 1 is the utility model top sectional arrangement drawing;

Fig. 2 is the utility model bottom sectional arrangement drawing;

The terminal 6-tap of 1-2-high-tension coil unshakable in one's determination 3-low-voltage coil 4-high-tension coil head end 5-high-tension coil section is lifted one's head the positive square ring 11-of 7-end circle 8-static board 9-core insulation 10-dihedral ring 12-end outlet 13-and is pressed nail 14-pressing plate 15-packing ring 16-folder oil guiding box 17-lower oil tank oil guiding box 18-wedge

Embodiment:

The utility model is the single-phase railway traction transformer machine body structure of 220kV level, and it mainly comprises part compositions such as iron core (1), high-tension coil (2), low-voltage coil (3).The voltage of high-tension coil head end (5) and high-tension coil end (6) is 220kV, and is even for making Electric Field Distribution, and machine body structure adopts all insulation design.Impact gradient for reducing the end electric field, increase the electric capacity of end winding, high-tension coil head end (4) and high-tension coil end (5) all adopt circle coilings such as the formula of being entangled with, and other line segment of high-tension coil (2) adopts the continous way coiling; Be the top and the bottom structure that guarantees high-tension coil (2) symmetry fully, the ampere-turn balance that is evenly distributed improves the anti-short circuit capability of transformer coil, so the tap section is lifted one's head (6) at high-tension coil (2) 1/2 place longitudinally.

Between high-tension coil head end (4) and high-tension coil end (5) and end circle (7), place static board (8), increase the radius of curvature of static board (8), purpose is to reduce static board (8) metal surface electric field strength, reduce the maximum of high-tension coil (2) both ends electric field strength, evenly the end Electric Field Distribution.Place the positive square rings in three roads (10) in high-tension coil head end (4), high-tension coil end (5) and core insulation (9) interlayer symmetry, one dihedral ring (11) can increase the creepage distance of high-tension coil (2).The end outlet (12) of high-tension coil head end (4) and high-tension coil end (5) is eliminated corner angle with the coated shielding of aluminium foil, improves electrode shape, reduces field intensity, prevents partial discharge; The outer coated electric insulation crimped paper of aluminium foil layer strengthens the electric insulation intensity that goes between; The outermost layer corrugated board of double-baging guarantees the oily ebb interval of end outlet (12) to prevent that local overheating from appearring in end outlet (12).The device body is adopted and is pressed nail (13) to compress, press and place three layers of packing ring (15) between nail (13) and the pressing plate (14), adopt between device body bottom folder oil guiding box (16) and the lower oil tank oil guiding box (17) wedge (18) positive and negative cooperate urgent, guarantee device body and lower oil tank oil guiding box (17) close fit, improve the anti-short circuit capability of transformer body.

Claims

1, the utility model is the single-phase railway traction transformer machine body structure of a kind of 220kV level, mainly form by (1), high-tension coil (2) unshakable in one's determination, low-voltage coil parts such as (3), it is characterized in that: high-tension coil head end (4) and high-tension coil end (5) all adopt circle coilings such as the formula of being entangled with, and other line segments of high-tension coil (2) adopt the continous way coiling; The tap section lift one's head (6) be positioned at high-tension coil (2) 1/2 place longitudinally.

2, the single-phase railway traction transformer machine body structure of a kind of 220kV level according to claim 1, it is characterized in that: between high-tension coil head end (4) and high-tension coil end (5) and end circle (7), accompany static board (8), interlayer symmetry at high-tension coil head end (4), high-tension coil end (5) and core insulation (9) is placed with the positive square rings in three roads (10), one dihedral ring (11) simultaneously.

3, the single-phase railway traction transformer machine body structure of a kind of 220kV level according to claim 1, it is characterized in that: the end outlet (14) of high-tension coil (2) is by the coated shielding of aluminium foil, the outer coated electric insulation crimped paper of aluminium foil layer, outermost layer is coated two-layer corrugated board.

4, the single-phase railway traction transformer machine body structure of a kind of 220kV level according to claim 1, it is characterized in that: the device body is adopted and is pressed nail (13) to compress, press placement three layers of packing ring (15) between nail (13) and the pressing plate (14), adopt between device body bottom folder oil guiding box (16) and the lower oil tank oil guiding box (17) wedge (18) positive and negative cooperate urgent.