CN201332005Y - Combined dry-type transformer - Google Patents

Abstract

A combined dry-type transformer comprises a transformer, a high-pressure unit and a low-pressure unit, and is characterized in that the coil end portion of a high-low-pressure coil after dipping lacquer is provided with end seal resin, an insulating system of the transformer is N O M E X paper and a production thereof in a C level (220 DEG C) insulating level, and a high pressure load switch for integrating a high pressure isolating switch, a grounding switch and a high pressure fuse into one body is arranged in the high pressure unit. The combined dry-type transformer improves the clamping structure of an existing dry-type transformer, which is provided with a vibration-damping cushion block, increases dipping lacquer times, seals ends by resin, and improves the capability of moisture resistance, rain resistance, pollution prevention, compact and vibration resistance, and the high pressure load which is provided achieves the zero-distance protection to the transformer, and assures the security of equipment and human bodies. The combined dry-type transformer has the characteristics of low consumption, low temperature rise, strong overload capacity, short circuit resistance, strong anti-compact force, and excellent sealing property and environmental protection performance.

Description

The composite type dry-type transformer

Technical field

The utility model relates to a kind of transformer, particularly relate to a kind of compact conformation, volume little, adopt modified model open type H level dry-type transformer and the safe and reliable supporting composite type dry-type transformer of high voltage load switch, the controller switching equipment technical field that belongs to electric power networks can be widely used in factories and miness, square, residential quarter, area, city center, go deep into the distribution transforming equipment of the electric power networks end of load center.

Background technology

Along with the development of the expansion of urban construction scale and modern economy consideration to environmental factor, the sort of concentrated step-down of past, long apart from distribution and the power supply development that more and more hampered modern city as the overhead system of cobweb formula.Now, the city net is built to transform and is required high pressure directly to enter the urban district, and converting equipment gos deep into load center, and electric energy transmits by underground cable, and controller switching equipment and surrounding environment are harmonious.Require distribution equipment safe and reliable simultaneously, high-performance is low-loss, low noise, high Short Circuit withstand intensity, the miniaturization of volume trend, functional diversities, install and use easy, non-maintaining or few the maintenance, combined transformer is a kind of so novel controller switching equipment, and combined transformer is the transformer that transformer body, switchgear, fuse, shunting switch and corresponding auxiliary equipment are made up.

Though the combined transformer kind is multifarious on the transformer market at present, shortcomings such as ubiquity poor reliability, use very flexible, environmental-protecting performance difference.

Summary of the invention

The purpose of this utility model just is to overcome the prior art above shortcomings; provide a kind of novel composite type dry-type transformer; this composite type dry-type transformer improves the clamping structure structure of existing open type H level dry-type transformer; the vibration damping cushion block is set; increase the dipping lacquer number of times; carry out resin end envelope; shock resistance and vibration have been improved; moisture resistance is wet; anti-drenching with rain; antipollution ability; also in high voltage unit high voltage isolator; the high voltage load switch that earthed switch and high-tension fuse combine together; realize the zero distance protection of composite type dry-type transformer; guarantee equipment and personal safety, have low-loss; low temperature rise; overload capacity is strong; the shock-resistant ability of Short Circuit withstand is strong; the characteristics of sealing property and good environmental protection.

The technical solution that the utility model provides is: this composite type dry-type transformer, include transformer, high voltage unit and low voltage unit three parts, and be characterized in

The dipping lacquer number of times of described high-voltage coil and low-voltage coil is at least 3 times, and the end winding of the high-voltage coil and low-voltage coil behind the dipping lacquer is provided with end envelope resin, and the insulation system of transformer is the NOMEX paper and the goods thereof of C level (220 ℃) class of insulation;

Be provided with the high voltage load switch that high voltage isolator, earthed switch and high-tension fuse are become one in the described high voltage unit.

For better finishing the purpose of this utility model, described end envelope resin is made up of 8 parts " CER5212A epoxy resin " and 1 part " CER-XP normal temperature cure agent ".

For better finishing the purpose of this utility model, the folder of described transformer, draw the sectional area that uses of screw rod material to be 201mm ²

For better finishing the purpose of this utility model, the pad pin insulation position of the hold-down mechanism of described coil is provided with the iron yoke cushion block that silicon rubber is made.

In the utility model,, make the composite bending modulus of transformer increase by 55% owing to folder, draw the more former design specification of the use sectional area of screw rod material to improve 40%; , tensile strength improves 40%, because the dipping lacquer number of times of high-voltage coil and low-voltage coil makes the dipping lacquer film forming thickness thicken one times at least by once being increased to three times of former design specification, has improved electrical strength, mechanical strength, high-temperature capability and the humidity resistance of coil; The utility model is to be added " CER-XP normal temperature cure agent " ratio mediation in 8: 1 by weight to form by " CER5212A epoxy resin " at the end envelope resin of end winding brushing, the manufacturer of wherein " CER5212A epoxy resin " is a Shanghai sky over the river macromolecule Co., Ltd, and the manufacturer of " CER-XP normal temperature cure agent " also is a Shanghai sky over the river macromolecule Co., Ltd.End envelope resin is the repairing materials to the pouring defect of poured with epoxy resin dry-type transformer, and its solidfied material has characteristics such as excellent electric, mechanical, protection against the tide, can greatly improve anti-drenching with rain of the present utility model and prevents the ability of making moist.

Transformer insulated system synthesis of the present utility model the advantage of existing open type H level dry-type transformer and poured with epoxy resin formula dry-type transformer, the NOMEX paper and the goods thereof of C level (220 ℃) class of insulation have been selected for use, surpass loading capability fully in order to guarantee that transformer has, open type H level dry-type transformer is to use by H level (180 ℃) design, and be to use by F level (155 ℃) design at insulation system of the present utility model, promptly the utlity model has 42% the loading capability that surpasses.

The utility model the formation high voltage load switch that high voltage isolator, earthed switch and high-tension fuse combine together, is realized the zero distance protection of composite type dry-type transformer in high voltage unit, guarantee equipment and personal safety; Handled easily and maintenance and repair simultaneously, if desired during interruption maintenance composite type dry-type transformer, only need just can overhaul and maintain, improve Operation and maintenance personnel's convenience and fail safe greatly transformer and other electrical equipment with behind high voltage isolator separating brake, the earthed switch combined floodgate.

In technique scheme, NM other structures of the present utility model are same as the prior art.

Compared with prior art; the beneficial effects of the utility model are: not only the clamping structure structure of existing open type H level dry-type transformer is improved; the vibration damping cushion block is set; increase the dipping lacquer number of times; carry out resin end envelope; shock resistance and vibration have been improved; moisture resistance is wet; anti-drenching with rain; antipollution ability; also in high voltage unit high voltage isolator; the formation high voltage load switch that earthed switch and high-tension fuse combine together; realize the zero distance protection of composite type dry-type transformer; guarantee equipment and personal safety, have low-loss; low temperature rise; overload capacity is strong; the shock-resistant ability of Short Circuit withstand is strong; the characteristics of sealing property and good environmental protection.

Description of drawings

After Fig. 1 is high-tension coil of the present utility model and low-voltage coil dipping lacquer drying, at the schematic diagram of end winding brushing end envelope resin;

To be the utility model with preceding very high voltage grade transformer station be connected Fig. 2 uses schematic diagram.

Embodiment

Below in conjunction with embodiment concrete technical scheme of the present utility model is described further:

This composite type dry-type transformer, include transformer, high voltage unit and low voltage unit three parts, wherein the dipping lacquer number of times of high-voltage coil and low-voltage coil 9 is 3 times, the coil upper end face 10 of the high-voltage coil and low-voltage coil 9 behind the dipping lacquer and coil lower surface 11 all are coated with to be brushed with holds the envelope resin to carry out upper end envelope and lower end envelope, the insulation system of transformer is the NOMEX paper and the goods thereof of C level (220 ℃) class of insulation, is provided with the high voltage load switch that high voltage isolator, earthed switch and high-tension fuse are become one in the high voltage unit.

The application conditions and the technical parameter of the composite type dry-type transformer that the utility model provides are as follows: environment for use

(1) height above sea level≤2500 meter;

(2) ambient temperature-30 ℃～40 ℃;

(3) can moist, have certain pollution and outdoor rain spraying environment to install and use.

Composite type dry-type transformer specification and technical parameter table table 1

The coil upper end face 10 of high-voltage coil and low-voltage coil 9 shown in Figure 1 and the end of coil lower surface 11 envelope situation, end envelope resin are to be added " CER-XP normal temperature cure agent " to form in ratio mediation in 8: 1 by " CER5212A epoxy resin ".Upper and lower side brushing 150mm height, disc thickness 0.5mm, upper surface thickness 0.8mm.

End envelope resin is that the pouring defect of poured with epoxy resin dry-type transformer is repaired materials, and its solidfied material has characteristics such as excellent electric, mechanical, protection against the tide, its performance such as table 2

Condensate performance table table 2

Pilot project	Standard	Unit	Characteristic value
				Hot strength	GB1040	N/mm 2	65～75
Break modulus	GB1040	N/mm 2	3000～4000
				Elongation at break	GB1040	％	4～5
Impact strength	GB1043	KJ/m 2	22～28
				Bending strength	GB1042	N/mm 2	120～125
Vitrification point	TMA	℃	90～100
				Fail temperature	TGA	℃	350
Boil water absorption rate	GB1034	％	0.2～0.3
				Surface resistivity	GB1410	Ω		10 14～15
Specific insulation	GB1410	Ω.cm							10 15～16
				Breakdown strength	GB1008	KV/mm	18～20

Composite type dry-type transformer shown in Figure 2 is connected user mode with preceding very high voltage grade transformer station, in the preceding utmost point transformer station 1 transformer 3 is arranged, and its secondary output voltage is 10KV; Join high voltage load switch 2, shield; Cable 4 is 10KV level output lines of preceding utmost point transformer station.Can dispose many composite type dry-type transformers 7 in parallel in the electricity consumption factory building 5 as required, every composite type dry-type transformer has high voltage load switch 6, plays the partition effect, which platform to open which platform with, repair any platform and stop any platform; Can prepare at random according to situation such as frequency of utilization, payload everywhere.Mark 8 is a cable among the figure.

Claims (2)

1. a composite type dry-type transformer includes transformer, high voltage unit and low voltage unit three parts, it is characterized in that

The end winding of the high-voltage coil and low-voltage coil behind the dipping lacquer is provided with end envelope resin, and the insulation system of transformer is the NOMEX paper and the goods thereof of C class F insulation grade;

Be provided with the high voltage load switch that high voltage isolator, earthed switch and high-tension fuse are become one in the described high voltage unit.

2. composite type dry-type transformer according to claim 1 is characterized in that the pad pin insulation position of the hold-down mechanism of coil is provided with the iron yoke cushion block that silicon rubber is made.

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