CN210865883U

CN210865883U - Voltage transformer for switching power supply

Info

Publication number: CN210865883U
Application number: CN201921844484.2U
Authority: CN
Inventors: 潘文韬; 吴昌松
Original assignee: Lujiang Herun Technology Co ltd
Current assignee: Lujiang Herun Technology Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-06-26
Anticipated expiration: 2029-10-30

Abstract

The utility model relates to a voltage transformer for a switching power supply, which comprises a shell, wherein a binding post is arranged on the shell, the bottom of the binding post penetrates through the shell to be connected with the voltage transformer, and a wiring nut is arranged on the binding post; in addition, an insulating sheath is arranged on the shell and sleeved on the wiring terminal; the top of the insulating sheath is provided with an insulating cap, and the side wall of the insulating sheath is provided with a cable through hole; through the structure, two independent spaces are formed between the wiring position and the voltage transformer, and the reliability and the weather resistance of the voltage transformer are enhanced, especially under the harsh natural environment.

Description

Voltage transformer for switching power supply

Technical Field

The utility model belongs to the technical field of power equipment, especially, relate to a voltage transformer field for switching power supply.

Background

Voltage transformers (PT for short, VT for short) and transformers are similar and used to transform the voltage on the line. However, the purpose of transforming voltage by the transformer is to transmit electric energy, so the capacity is large, and the capacity is generally calculated by kilovolt-ampere or mega volt-ampere; the voltage transformer is mainly used for supplying power to a measuring instrument and a relay protection device, measuring the voltage, power and electric energy of a line, or protecting valuable equipment, a motor and a transformer in the line when the line fails, so that the capacity of the voltage transformer is very small, generally only a few volt-amperes and dozens of volt-amperes, and the maximum voltage does not exceed one thousand volt-amperes; the voltage transformer is a transformer with iron cores. It is mainly composed of primary and secondary coils, iron core and insulation. When a voltage U1 is applied to the primary winding, a magnetic flux is generated in the core according to the law of electromagnetic induction, and a secondary voltage U2 is generated in the secondary winding. The turns of the primary winding or the secondary winding are changed to generate different ratios of the primary voltage to the secondary voltage, so that voltage transformers with different ratios can be formed. The voltage transformer converts high voltage into low voltage (100V) in proportion, the primary side of the voltage transformer is connected with a primary system, and the secondary side of the voltage transformer is connected with a measuring instrument, relay protection and the like; the traditional connecting terminal of the voltage transformer is directly exposed in the external environment, and may not play a normal role in a harsh natural environment, or the service life is shortened, and the applicability and the weather resistance in a high-altitude environment are poorer.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a reliability of enough guaranteeing voltage transformer in order to solve above-mentioned problem just, improve voltage transformer's mechanical life and electric life-span.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

a voltage transformer for a switching power supply comprises a shell, wherein a binding post is arranged on the shell, the bottom of the binding post penetrates through the shell to be connected with the voltage transformer, and a wiring nut is arranged on the binding post; in addition, an insulating sheath is arranged on the shell and sleeved on the wiring terminal; the top of the insulating sheath is provided with an insulating cap, and the side wall of the insulating sheath is provided with a cable through hole; the shell is a metal shell, and is provided with a through hole; the shell has enough structural strength to meet the explosion-proof requirement in the use of the voltage transformer, epoxy resin is poured into the shell through the through hole or SF6 gas is filled into the shell; epoxy resin is poured into the shell through the through holes, the shell is tightly wrapped and firmly bonded, moisture can be prevented, and the voltage transformer is protected from good insulativity; fully enclosed switchgear using SF6 gas insulation occupies a much smaller area than conventional open high voltage switchgear and its operation is not affected by external weather and environmental conditions.

As a further optimization scheme of the utility model, scribble insulating silicone grease on the casing upper surface in the insulating sheath, just insulating sheath and insulating contact surface of pressing the cap scribble insulating silicone grease.

The beneficial effects of the utility model reside in that:

1) the utility model discloses in through the position with the cable wiring with the voltage transformer separation, form two independent spaces, fully guaranteed insulating layer thickness, strengthened voltage transformer reliability and adaptability in the use.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic cross-sectional view of an insulating sheath of the present invention;

in the figure: 1. a housing; 11. a binding post; 2. a voltage transformer; 3. a wiring nut; 4. an insulating sheath; 41. an insulating cap; 42. and a cable through hole.

Detailed Description

The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.

The voltage transformer for the switching power supply shown in fig. 1 and 2 comprises a shell 1, wherein the shell 1 is a metal shell and is provided with a through hole; epoxy resin can be poured into the shell or SF6 gas can be injected into the shell through the through hole; if epoxy resin is poured, the epoxy resin can be poured into the shell integrally, and the shell is tightly wrapped and firmly adhered, so that moisture can be prevented and the voltage transformer can be protected from good insulativity;

if the electric structure is filled with SF6 gas, the compatibility with the electric structure material is similar to that of nitrogen when the temperature does not exceed 180 ℃ due to the high stability of the SF6 gas; SF6 is strong electronegative gas, the molecules of which are easy to adsorb free electrons to form negative ions with large mass, and the impact ionization process in the gas is weakened, so the electrical insulation strength of the SF6 is very high and is about 2.5 times of the air insulation strength in a uniform electric field; SF6 is widely used as an insulating medium for high voltage electrical equipment.

In addition, the SF6 gas-insulated fully-closed switchgear occupies a much smaller area than a conventional open-type high-voltage power distribution device, the operation of the totally-closed switchgear is not influenced by external weather and environmental conditions, and a transformer or a mutual inductor using SF6 gas insulation has the advantages of fire and explosion prevention;

in addition, in order to enhance the reliability and the adaptability of the voltage transformer in use, two independent spaces are formed by separating the cable wiring position from the voltage transformer, and the thickness of an insulating layer is fully ensured, namely, a wiring terminal 11 and an insulating sheath 4 are arranged on the shell 1, the insulating sheath 4 is sleeved on the wiring terminal 11, the bottom of the wiring terminal 11 penetrates through the shell 1 to be connected with the voltage transformer 2, and a wiring nut 3 is arranged on the wiring terminal 11; the top of the insulating sheath 4 is provided with an insulating cap 41, and the side wall is provided with a cable through hole 42;

when the cable connector is used, the insulation cap is opened, the connector lug of a cable is wound on the wiring terminal, then an auxiliary tool such as a wrench is used for rotating the nut, the nut is gradually downward, the cable lug is fixed on the wiring terminal, the upper surface of the shell 1 in the insulation sheath 4 is coated with insulation silicone grease, and the contact surface between the insulation sheath 4 and the insulation cap 41 is coated with the insulation silicone grease; finally, the insulating cap 41 is pressed into the insulating sheath 4, so that the space in the insulating sheath is sealed and insulated, and no outer leakage exists.

The structure enables the wiring position and the voltage transformer to form two independent spaces, and the reliability and the weather resistance of the voltage transformer are enhanced, especially under the harsh natural environment.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. A voltage transformer for a switching power supply, characterized by: the transformer comprises a shell (1), wherein a binding post (11) is arranged on the shell (1), the bottom of the binding post (11) penetrates through the shell (1) to be connected with a voltage transformer (2), and a wiring nut (3) is arranged on the binding post (11); in addition, an insulating sheath (4) is arranged on the shell, and the wiring terminal (11) is sleeved with the insulating sheath (4); the top of the insulating sheath (4) is provided with an insulating cap (41), and the side wall of the insulating sheath is provided with a cable through hole (42); the shell (1) is a metal shell, through holes are formed in the metal shell, and epoxy resin is poured into the shell (1) through the through holes or SF6 gas is filled in the through holes.

2. A voltage transformer for a switching power supply according to claim 1, characterized in that: and the upper surface of the shell (1) in the insulating sheath (4) is coated with insulating silicone grease, and the contact surface of the insulating sheath (4) and the insulating cap (41) is coated with insulating silicone grease.