CN2540060Y

CN2540060Y - Heat protector for dry transformer

Info

Publication number: CN2540060Y
Application number: CN 02232210
Authority: CN
Inventors: 戴南平
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-11
Filing date: 2002-04-11
Publication date: 2003-03-12
Anticipated expiration: 2012-04-11

Abstract

The utility model relates to a heat protector for dry transformer. The prior products in the same kind have electric circuit board structure and have the disadvantages of complex structure, short service life and poor utilization reliability. The utility model consists of a shell and an upper temperature switch, a medium temperature switch and a lower temperature switch which are all positioned inside the shell and all connected with an upper wire, a medium wire and a lower wire respectively. The utility model is characterized in a proper, simple and novel structure design, convenient and reliable utilization and long service life.

Description

The dry-type transformer thermel protection device

Technical field

The utility model relates to a kind of thermel protection device, particularly a kind of dry-type transformer thermel protection device, and it mainly is applicable to overtemperature sound and light alarm, the overtemperature tripping alarm of transformer and starts blower fan automatically.

Technical background

Dry-type transformer thermel protection device of the prior art; its structure is controlled by electronic circuit board; when three groups of winding temperatures of dry-type transformer raise; relative variation takes place in temperature element (platinum resistance); by the sample circuit processing resistance change is converted to electric weight, again through realizing the control purpose after the technical finesse of computing amplification and application-specific integrated circuit (ASIC).Because the electronic circuit board complex structural designs, the electronic component life-span is short, cost is high, especially when being subjected to electromagnetic interference to cause false alarm and mistrip fault, can cause heavy losses to the user.

Summary of the invention

Technical problem to be solved in the utility model provides long and service-strong dry-type transformer thermel protection device of a kind of simple in structure, life-span.

The technical scheme in the invention for solving the above technical problem is a kind of thermel protection device of being made up of housing, last temperature switch, middle temperature switch and following temperature switch of design; the upper, middle and lower temperature switch is installed in the housing, and is connected with the upper, middle and lower electric wire respectively on the temperature switch of upper, middle and lower.

Upper, middle and lower described in the utility model temperature switch can be bonded in the housing.

The utility model compared with prior art has the following advantages and effect: reasonable in design, simple, novel, and use cost is low, and the life-span is long, and is easy to use and reliable simultaneously, is difficult for false alarm and mistrip fault take place, and solved the problem of electromagnetic interference.

Description of drawings is as follows

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is an embodiment schematic diagram of the present utility model.

Embodiment

Referring to Fig. 1, Fig. 2, the utility model mainly by housing 1, go up temperature switch 2, middle temperature switch 3 and down temperature switch 4 forms, temperature switch 4 was installed in the housing 1 under last temperature switch 2, middle temperature switch 3 reached.Described in the present embodiment temperature switch is bonded in the housing 1, and it can be often to open temp control switch.Be connected with electric wire 5, middle electric wire 6 and following electric wire 7 on the upper, middle and

lower temperature switch

2,3,4 respectively.

During use, the utility model I is connected with dry-type transformer three

phase windings

8,9,10, and links to each other with transition control cabinet 11.The control temperature of the utility model I can be respectively at 90 ℃, 125 ℃ and 145 ℃.When any one group of temperature reached 90 ℃ on dry-type transformer three

phase windings

8,9,10, following temperature switch 4 closures started blower fan 12 and are blown into air quantity, its temperature is descended after, the Chang Kaiyuan shape is recovered in the contact.When temperature surpasses 125 ℃, middle temperature switch 3 closures, buzzer is reported to the police.When temperature surpasses 145 ℃, last temperature switch 2 closures, the transformer tripping operation is drawn.

Claims

1. dry-type transformer thermel protection device; it is characterized in that: it is made up of housing (1), last temperature switch (2), middle temperature switch (3) and following temperature switch (4); upper, middle and lower temperature switch (2), (3), (4) are installed in the housing (1), and on upper, middle and lower temperature switch (2), (3), (4), be connected with upper, middle and lower electric wire (5) respectively, (6), (7).

2. thermel protection device according to claim 1 is characterized in that: described upper, middle and lower temperature switches (2), (3), (4) can be bonded in the housing (1).