CN2588506Y

CN2588506Y - T-type transformer for electric furnace

Info

Publication number: CN2588506Y
Application number: CN 02251371
Authority: CN
Inventors: 徐振华
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-12-19
Filing date: 2002-12-19
Publication date: 2003-11-26
Anticipated expiration: 2012-12-19

Abstract

The utility model relates to a T-shaped transformer for an electric furnace, which comprises an iron core. The utility model is characterized in that the iron core comprises two single-phase iron cores; the two single-phase iron cores are combined together; a pair of high-voltage upper clamping piece and low-voltage upper clamping piece and a pair of high-voltage lower clamping piece and a low-voltage lower clamping piece are clamped by a plurality of clamping screw rods and clamping screw nuts; the lower clamping pieces are fixedly connected with pad feet through screw bolts; two core columns of the single-phase iron core are respectively sheathed with a high-voltage coil and a low-voltage coil to form the A phase of a three-phase transformer by connection; a group of high-voltage coils and low-voltage coils which are staggered are respectively arranged on two columns of the other single-phase iron core to form into the B phase and the C phase of the three-phase transformer by connection. Input voltage is a three-phase power source; output is two pieces of single-phase voltage. The utility model has the advantages of high balanced ratio of three-phase current, steady output current, simple structure, easy manufacture, the lower zero load of the transformer and the lower load loss of the transformer.

Description

T type furnace transformer

(1) technical field

The utility model relates to a kind of transformer, particularly relates to a kind of T type transformer that is used for metallurgical furnace.

(2) background technology

Traditional special steel metallurgical furnace is to adopt single-phase transformer to do power supply.Because metallurgical furnace strengthens gradually, power consumption strengthens.If adopt single-phase transformer will cause three phase mains seriously uneven, disturb the electrical network normal power supply.If adopt various compensation arrangements to solve, not only cost height, and effect is also relatively poor.If adopt T type furnace transformer, effect can be improved significantly.

(3) summary of the invention

The technical problems to be solved in the utility model provides a kind of a kind of T type furnace transformer that three-phase alternating current is become the electricity consumption of single-phase ac power supply stove.

The technical scheme that adopts is:

The main points of T type furnace transformer are: comprise two single-phase iron cores, the staggered coil of high-low pressure is housed on each iron core column of two posts of one of them single-phase iron core, wherein high-tension coil connects the A phase of forming three-phase transformer by certain way; Be respectively equipped with the staggered coil of one group of high and low pressure on two posts of another single-phase iron core, connect B, the C phase of forming three-phase transformer by certain way.Input voltage is a three phase mains, is output as two single-phase voltages.

The iron core that is set with coil the burn-on copper bar of low pressure request and the device body that high-voltage line is formed, be placed in the fuel tank that has radiating tube, seat is equipped with Zhi Tie under the case lid on the locating pin of case bottom, be fixed on the folder with screw rod, 3 bushings and a zero sleeve pipe mutually are housed on the case lid.Low-pressure side has 8 copper bars to stretch out terminal block.Also be equiped with oil conservator, Buchholz relay, dehydrating breather, relief valve on the case lid.In addition, evenly be installed with 4 boatswain chairs etc. on the case lid.The fuel tank upper lateral part is equipped with 4 joint hinges that hang the whole usefulness of transformer, and the fuel tank bottom is provided with drain the oil door and oil sample valve.This part is a prior art, so ominous chatting.

This product development has following advantage:

1, T type furnace transformer, if supply two single-phase electricfurnace electricity consumptions simultaneously respectively with two single phase poaer supplies, the three-phase balance rate reaches more than 95%.If for a single-phase electricfurnace usefulness, three-phase current electricity apportionment ratio is 100%, 50%, 50% with a single phase poaer supply.Adopt electric capacity to compensate as needing this moment, and the three-phase balance rate reaches more than 95%.

2, simple in structure, easy to manufacture.

What 3, zero load of transformer own and load loss can be done is lower.

(4) description of drawings

Fig. 1 is the transformer core structural representation of a kind of embodiment of the present utility model.

Fig. 2 is the high-tension coil schematic diagram of A phase coil.

Fig. 3 is the high-tension coil schematic diagram of B phase coil.

Fig. 4 is the low-voltage lead connection diagram.

Fig. 5 is the high-voltage connection schematic diagram.

Fig. 6 is the continuous wiring lead-in wire of B, a C schematic diagram.

(5) embodiment

T type furnace transformer, comprise iron core, iron core comprises 1,2, two single-phase iron cores 1,2 of two single-phase iron cores also together, clamp by 16 clamping screws 11 and double nut with one pair of high pressure upper clamping piece 3,4, one pairs of high pressure lower clamping pieces 10 of low pressure upper clamping piece, low pressure lower clamping piece 5.Lower clamping piece tightens up with pad pin 12 by bolt and is connected.Iron core is to adopt 0.3 electrical steel sheet to build up, and each stem stem middle part binds with 0.1 * 50 alkali-free band.

T type furnace transformer capacity is 500kVA, and input voltage is the 10000V three phase mains, is output as two single-phase voltages, and its value is 46,43.5,39,35V, impedance U when 46V _k=5.5%.Two single-phase bringing onto loads simultaneously also can a single-phase zone load, or two single-phase series power supplies, if two single-phase series power supplies, its output voltage improves

Doubly.

Two stem stems 6,7 of single-phase iron core 1 are respectively installed with the high and low pressure coil, connect the A phase of forming three-phase transformer.Wherein high-tension coil is with ZB-0.45 insulation 1.6 * 6 flat type copper wire coiling upper semisections, is 12 also, every and 10-18 circle, and the oil duct gap is 5-20mm; Lower semisection is 10 also, every and 17-18 circle, and the oil duct gap is 5-15mm.And and and between separate on the stay of 8 five equilibriums with two dovetail cushion block strings.Low-voltage coil is 4 sections, and upper and lower each one section, the centre is two sections, forms with 13 doublings of 3 * 6.7 bare copper wires.Be separated by with 6mm cardboard circle between high-voltage coil and low-voltage coil.The high and low pressure coil is all around Φ _In250/ Φ _OutwardOn the insulating cylinder that 260 * 640 and 7 * 18 * 750 8 bracing bars are formed.

The coil of the staggered coiling of one group of high and low pressure is housed respectively on two stem stems 8,9 of single-phase iron core 2, and joint group becomes three-phase transformer B, C phase, wherein high-tension coil is two sections, is to be wound on the insulating cylinder with ZB-0.45 insulation 1.25 * 6.7 flat type copper wires to constitute, and upper semisection is 12 also, every also 12-21 circle, the oil duct gap is 5-18mm, and lower semisection is 10 also, every and 13-22 circle, the oil duct gap is 5-14mm, and and and between separate on the stay of 8 five equilibriums with two dovetail cushion block strings.Totally 4 sections of low-voltage coils, i.e. epimere, hypomere and middle two sections are with 2.5 * 5.6 15 of bare copper wires and around formation.Wherein B lifts one's head mutually in 1-2 retaining stay position; C lifts one's head in 8-1 retaining stay position.And and and between oil clearance be 6-16mm, be separated by with the thick electric insulation cardboard of 2mm circle for middle two sections.Be separated by with the thick electric insulation cardboard of 6mm circle between the high and low pressure coil.The high and low pressure coil all is contained in Φ _In250/ Φ _OutwardOn the insulating cylinder of 260 * 640 and 7 * 18 * 750 8 bracing bars.The initial and end head of each coil and parted hair leading-out end are all used the yellow paint silk ribbon, the electric insulation paper tape, and the tape wrapping is firmly.

Claims

1, T type furnace transformer, comprise iron core, it is characterized in that described iron core comprises two single-phase iron cores (1), (2), two single-phase iron cores (1), (2) are also together, with one pair of high pressure upper clamping piece (3), low pressure upper clamping piece (4), one pair of high pressure lower clamping piece (10), low pressure lower clamping piece (5) clamp by a plurality of clamping screws (11) and nut, and lower clamping piece tightens up with pad pin (12) by bolt and is connected; Two stem stems (6) of single-phase iron core (1), (7) are respectively installed with high-voltage coil and low-voltage coil, connect the A phase of forming three-phase transformer; Be respectively equipped with the staggered coil of one group of high and low pressure on two posts (8) of another single-phase iron core (2), (9), connect B, the C phase of forming three-phase transformer, input voltage is a three phase mains, is output as two single-phase voltages.

2, T type furnace transformer according to claim 1 is characterized in that:

High-tension coil on A, stem stem (6), (7) is with ZB-0.45 insulation 1.6 * 6 flat type copper wire coiling upper semisections, is 12 also, every and 10-18 circle, and oil duct is 5-20mm to the crack; Lower semisection is 10 also, every also 17-18 circle, the oil duct gap is 5-15mm, and and and between separate on the stay of 8 five equilibriums with two dovetail cushion block strings, low-voltage coil is 4 sections, upper and lower each one section, the centre is two sections, form with 13 doublings of 3 * 6.7 bare copper wires, be separated by with 6mm cardboard circle between high-voltage coil and low-voltage coil, the high and low pressure coil is all around Φ _In250/ Φ _OutwardOn the insulating cylinder that 260 * 640 and 7 * 18 * 750 8 bracing bars are formed;

B, stem stem (8), (9) high-tension coil on is two sections, be to be wound on the insulating cylinder with ZB-0.45 insulation 1.25 * 6.7 flat type copper wires to constitute, upper semisection is 12 also, every also 12-21 circle, the oil duct gap is 5-18mm, lower semisection is 10 also, every also 13-22 circle, the oil duct gap is 5-14mm, and and and between on the stay of 8 five equilibriums, separate totally 4 sections of low-voltage coils, i.e. epimere with two dovetail cushion block strings, two sections of hypomere and centres, be with 2.5 * 5.6 15 of bare copper wires and around formation, wherein B lifts one's head mutually and lifts one's head in 8-1 retaining stay position at 1-2 retaining stay position: C, and and and between oil clearance be 6-16mm, two sections of centres are separated by with the thick electric insulation cardboard of 2mm circle, high, be separated by height with the thick electric insulation cardboard of 6mm circle between low-voltage coil, low-voltage coil all is contained in Φ _In250/ Φ _OutwardOn the insulating cylinder of 260 * 640 and 7 * 18 * 750 8 bracing bars.