CN100550226C - Dry type resin insulated electrostatic precipitator rectifier transformer - Google Patents

Abstract

Dry-type resin insulated electrostatic precipitating rectifier transformer, composed of high-voltage coil casting body, low-voltage coil casting body, iron core installed in low-voltage coil casting body, insulator connected to high-voltage coil casting body, and fixing high-voltage and low-voltage coil casting body. The clamp and the lower clamp form a single-phase transformer, which is characterized in that an electrostatic ring is installed in the upper and lower end casting layers of the high-voltage coil casting body of the single-phase transformer, and two circular insulating cylinders are installed between the high-voltage and low-voltage coil casting bodies , Install two insulating angle rings on the upper and lower ends of the high-voltage coil casting body, and there are insulating pads between the angle rings and the high-voltage coil casting body, and are respectively set between the two upper angle rings and the two lower angle rings. Insulation spacers. In this technical solution, an electrostatic ring is installed in the casting body of the high-voltage coil to homogenize the electric field intensity at the end of the coil, the inner and outer cylinders are installed to reduce the electric field intensity between the high and low voltage coils, and the angle ring is to reduce the electric field intensity at the end of the coil.

Description

Dry type resin insulated electrostatic precipitator rectifier transformer

technical field

The invention relates to a transformer, in particular to a dry-type resin-insulated electrostatic precipitator rectifier transformer, which belongs to high-voltage power equipment and can be applied to power plants, building materials industries, chemical industries, and the like.

Background technique

Large-scale thermal power plants, cement plants and other building materials industries, chemical production industries, etc., have a lot of dust in the air, so the transformers they are equipped with need dust removal transformers, but the commonly used products of this type are oil-immersed dust removal transformers. The application of oil-immersed dust-removing transformers in the above-mentioned industries has the following disadvantages: First, the oil-immersed rectifier and dust-removing transformers will leak oil, and the oil must be monitored and replaced regularly, which is a heavy workload and troublesome; second, the dust removal equipment is an important system The higher the fire protection requirements for this type of equipment, the better, but the oil-immersed rectifier and dust removal transformer cannot meet the fire protection and many safety requirements of this occasion. And because the permissible electric field strength of each insulating material in the high-voltage electric field is limited, exceeding the permissible electric field strength will cause rapid aging and breakdown of the insulating material, which will cause insulation failure. Therefore, the existing dry-type resin-insulated single-phase transformer cannot be used as a dust-removing rectifier transformer.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art, and provide a dry-type resin-insulated electrostatic precipitator rectifier transformer that reduces or homogenizes the electric field intensity, is safe to use, has high voltage and small capacity, and is suitable for dust-removing rectifier equipment.

The technical scheme of the dry-type resin-insulated electrostatic precipitating rectifier transformer of the present invention is: a high-voltage coil cast body, a low-voltage coil cast body, an iron core installed in the low-voltage coil cast body, an insulator connected to the high-voltage coil cast body, and fixed high, The upper clamp and the lower clamp of the low-voltage coil casting body form a single-phase transformer, which is characterized in that an electrostatic ring is installed in the upper and lower end casting layers of the high-voltage coil casting body of the single-phase transformer, and is installed between the high-voltage and low-voltage coil casting bodies. Two circular insulating cylinders, two insulating angle rings are respectively installed on the upper and lower ends of the high-voltage coil cast body, and there is an insulating pad between the angle ring and the high-voltage coil cast body, between the two upper angle rings and two Insulating pads are respectively arranged between the lower corner rings. This technical solution installs an electrostatic ring in the cast body of the high-voltage coil to homogenize the electric field strength at the end of the coil, installs inner and outer insulating cylinders to reduce the electric field strength between the high and low voltage coils, and installs insulation on the upper and lower ends of the high-voltage cast body. The angle ring is to reduce the electric field strength at the end of the coil. Therefore, compared with the existing technology, this solution reduces or homogenizes the electric field intensity of the corresponding parts of the transformer, reaches the electric field intensity below the allowable use of insulating materials, meets the requirements of high voltage and small capacity levels, and can be used safely for a long time. It is suitable for dry Type resin insulated electrostatic precipitator rectifier transformer supporting requirements.

The dry-type resin-insulated electrostatic precipitating rectifier transformer of the present invention has a resin-cast skirt pad between the upper corner ring and the upper clamp, and a resin-cast skirt pad between the lower corner ring and the lower clamp. In addition, the connecting insulator of the outlet part of the high-voltage coil cast body is an outlet insulator with a super long creepage distance. On the top of the outlet insulator, there are connecting rods connected in series up and down. The outlet insulator with a super long creepage distance is designed to meet high Voltage creepage requirements. On the top of the outgoing line insulator, the installation method of connecting rods in series up and down is adopted, so that the distance between the incoming line and the outgoing line end of the coil is enlarged, and the phase-to-phase voltage is reduced to nearly 50% of the field strength of the existing technology, which meets the insulation requirements and reduces the electric field strength. The casting body of the high-voltage coil is made of conductor material and resin material, and has good insulation performance. The insulating angle ring and the insulating cylinder are made of resin material and have good insulating performance. There is a gap between the low-voltage coil casting body and the inner insulating cylinder, there is a gap between the inner insulating cylinder and the outer insulating cylinder, and there is a gap between the outer insulating cylinder and the high-voltage coil casting body. There is a corresponding distance between each component, and they are not in direct contact with each other.

Description of drawings

Fig. 1 is a schematic diagram of a dry type resin insulated electrostatic precipitator rectifier transformer of the present invention;

Fig. 2 is a schematic diagram of the dry-type resin-insulated electrostatic precipitator rectifier transformer A of the present invention;

Fig. 3 is a schematic cross-sectional view of B-B of the dry-type resin-insulated electrostatic precipitator rectifier transformer of the present invention.

Detailed ways

The present invention relates to a dry-type resin insulated electrostatic precipitator rectifier transformer. As shown in Fig. 1-Fig. The insulator 18 on the body, and the upper clamp 1 and the lower clamp 12 that fix the high and low voltage coil cast body form a single-phase transformer. Its main technical feature is that the upper and lower ends of the high voltage coil cast body 7 of the single phase transformer are cast An electrostatic ring 15 is installed in the layer to homogenize the electric field intensity at the end of the coil, and two circular insulating cylinders 13, 14 are installed between the high and low voltage coil casting bodies 7, 16 to reduce the electric field intensity between the high and low voltage coils. Two insulating angle rings 3, 5, 9, and 10 are respectively installed on the upper and lower ends of the high-voltage coil casting body 7 to reduce the electric field strength at the end of the coil. There are insulating pads between the angle rings 5, 9 and the high-voltage coil casting body 7 6, 61, between the two upper corner rings 3, 5 and between the two lower corner rings 9, 10, respectively set insulating pads 4, 41. Between the upper corner ring 3 and the upper clamping piece 1 there is a resin casting skirt pad 2 , and between the lower corner ring 10 and the lower clamping piece 12 there is a resin casting skirt pad 11 . The connected insulator at the outlet part of the high-voltage coil casting body 7 is an outlet insulator 18 with a super long creepage distance, and the top of the outlet insulator 18 is equipped with a connecting rod 8 connected in series up and down. Each insulating spacer and the outlet insulator with super long creepage distance are designed to meet the requirements of high voltage creepage distance in the smallest space. The way of connecting the upper and lower rods in series makes the distance between the incoming wire and the outgoing wire of the coil larger, which meets the insulation requirements. Its high-voltage coil casting body 7 is made of conductor material and resin material, that is, the conductor is cast with insulating resin material. Its insulating corner rings 3, 5, 9, 10 and insulating cylinders 13, 14 are made of resin material. There is a gap 131 between the low-voltage coil casting body 16 and the inner insulating cylinder 13 , a gap 141 between the inner insulating cylinder 13 and the outer insulating cylinder 14 , and a gap 142 between the outer insulating cylinder 14 and the high-voltage coil casting body 7 .

Claims (6)

1. Dry-type resin insulated electrostatic precipitating rectifier transformer, composed of high-voltage coil casting body, low-voltage coil casting body, iron core installed in low-voltage coil casting body, insulator connected to high-voltage coil casting body, and fixed high-voltage and low-voltage coil casting body The upper clamp and the lower clamp form a single-phase transformer, which is characterized in that an electrostatic ring (15) is installed in the upper and lower end casting layers of the high-voltage coil casting body (7) of the single-phase transformer, and the high-voltage and low-voltage coil casting bodies ( 7, 16) are installed between two circular insulating cylinders (13, 14), and two insulating angle rings (3, 5, 9, 10) are respectively installed on the upper and lower ends of the high-voltage coil cast body (7). There are insulating pads (6, 61) between the rings (5, 9) and the high-voltage coil cast body (7), between the two upper corner rings (3, 5) and between the two lower corner rings (9, 10) Insulating spacers (4, 41) are arranged respectively between them. 2. The dry-type resin-insulated electrostatic precipitator rectifier transformer according to claim 1, characterized in that there is a resin cast skirt pad (2) between the upper corner ring (3) and the upper clamp (1), and the lower corner Between the ring (10) and the lower clamping piece (12) there is a cushion block (11) with a resin casting belt skirt. 3. The dry-type resin insulated electrostatic precipitator rectifier transformer according to claim 1, characterized in that the connecting insulator at the outlet part of the high-voltage coil cast body (7) is an outlet insulator (18) with a super long creepage distance, and the outlet insulator ( 18) the top is equipped with connecting rods (8) connected in series up and down. 4. The dry-type resin-insulated electrostatic precipitator rectifier transformer according to claim 1, characterized in that the casting body (7) of the high-voltage coil is made of conductor material and resin material. 5. The dry-type resin-insulated electrostatic precipitator rectifier transformer according to claim 1, characterized in that the insulating angle rings (3, 5, 9, 10) and insulating cylinders (13, 14) are made of resin materials. 6. The dry-type resin-insulated electrostatic precipitator rectifier transformer according to claim 1, characterized in that there is a gap (131) between the low-voltage coil cast body (16) and the inner insulating cylinder (13), and the inner insulating cylinder (13) and There is a gap (141) between the outer insulating cylinders (14), and there is a gap (142) between the outer insulating cylinders (14) and the high-voltage coil cast body (7).

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