CN2398772Y

CN2398772Y - Oil-immersed high-voltage starting thermistor

Info

Publication number: CN2398772Y
Application number: CN99245458U
Authority: CN
Inventors: 余龙海
Original assignee: XIANGFAN DALI INDUSTRIAL CONTROL Co Ltd
Current assignee: XIANGFAN DALI INDUSTRIAL CONTROL Co Ltd
Priority date: 1999-11-30
Filing date: 1999-11-30
Publication date: 2000-09-27
Anticipated expiration: 2009-11-30

Abstract

The utility model relates to an oil-immersed high-voltage starting thermistor used for reduced-voltage starting for electric motors, which comprises a thermistor composed of an electrohydraulic box, electric liquid, shoe cover oil, a pole plate, a respiratory chamber, a respiratory hole and electrodes. The utility model is characterized in that the thermistor is immersed into a main oil box provided with transformer oil, a top cover of the main oil box is led out by the respiratory hole on the electrohydraulic box and the electrodes through a sealing insulating bushing, and the top of the main oil box is provided with an oil conservator. The utility model has the advantages of stable insulating and pressure resistant performance and no influence of environmental factors, such as dust, moisture, etc., and the utility model is suitable for the reduced-voltage starting for high-voltage and high-power electric motor.

Description

Oil-immersed and high-voltage starting thermistor

The utility model relates to a kind of oil-immersed and high-voltage starting thermistor of motor reduced voltage starting, is particularly useful for the reduced voltage starting of large-scale high-tension motor.

At present, mainly there is following shortcoming in the known thermistor that is used for the motor reduced voltage starting: 1. can only be applicable to the reduced voltage starting of middle-size and small-size motor, and allow the frequency of starting very low; 2. insulation system complexity, and easy dewfall and knot dirt cause insulation breakdown.

It is big that the purpose of this utility model provides a kind of capacity, and insulation and withstand voltage properties are stable, strong to adaptive capacitys such as low temperature and humidities, applicable to 10KV or the 6KV level capacity oil-immersed and high-voltage starting thermistor from 2000KW to 20000KW.

The technical scheme that realizes the utility model purpose is that whole immersion of being made up of electrohydraulic box, electric liquid, shoe lid oil, pole plate, respiratory chamber, spiracle and electrode of thermistor is equipped with in the main fuel tank of transformer oil, and spiracle on the electrohydraulic box and electrode are drawn the main fuel tank top cover by the insulating sleeve of sealing; Main fuel tank is equipped with oil conservator on the top, and the transformer oil in the main fuel tank is charged in the oil conservator.

The oily circulating cooling system that communicates with transformer oil in the main fuel tank is housed on the said main fuel tank in the technique scheme, and oily circulating cooling system comprises oil pump, electric heater, and board-like water cooling heat exchanger, valve and pipeline are connected to cooling water pipe on the board-like water cooling heat exchanger.

Said plate heat exchanger is the air blast cooling radiator in the above-mentioned technology case, is furnished with the cooler axial flow blower.

The utility model makes its insulation and withstand voltage properties stable owing to adopted the oil immersed type structure, is not subjected to Effect of Environmental such as dust and humidity; It is enough big that thermal capacity can be done, to satisfy the needs of high capacity motor starting; Owing to increased cooling device, thereby can improve the electric motor starting frequency; Increased heater, made it have cold tolerance; The utility model is applicable to 10KV or the 6KV level capacity reduced voltage starting from the high capacity motor of 2000KW to 20000KW.

Accompanying drawing is a structural representation of the present utility model.

The utility model is described in further detail below in conjunction with accompanying drawing:

Main fuel tank 1 and oil conservator 4 constitute fuel tank, dash full transformer oil 2 in fuel tank, and oil column 5 and drier 3 are housed on the oil conservator 4, and transformer oil 2 can be towards the centre position of oil column 5 to oil conservator 4; Thermistor is made up of electrohydraulic box 6, electric liquid 12, shoe lid oil 11, pole plate 9, respiratory chamber 10, spiracle 7 and electrode 8, and thermistor integral body places main fuel tank 1, and immerses in the transformer oil 2; Pole plate 9 and electric liquid 12 are housed in the electrohydraulic box 6, and floating above the electric liquid 12 have one deck to carry out lid oil 11, and two-plate 9 is drawn electrohydraulic box 6 by electricity level 8, and electrode 8 is drawn main fuel tank 1 top cover by the insulating sleeve of sealing and fixed; Electrohydraulic box 6 internal upper parts leave respiratory chamber 10, and respiratory chamber 10 communicates with atmosphere by spiracle 7, and spiracle 7 is shared with tank filler sleeve, draw the top cover of main fuel tank 1 by the insulating sleeve of sealing, as shown in drawings; On main fuel tank 1, be connected with the oily circulating cooling system that communicates with transformer oil 2 in the main fuel tank 1, the oil circulating cooling system comprises oil pump 20, plate heat exchanger 18, valve 15 and pipeline 13,14, oil pump 20 forms a loop by the transformer oil in valve 15 and pipeline 13 and the main fuel tank 12, oil pump 20 is by plate heat exchanger 18, valve 15 and pipeline 14,13 with main fuel tank 1 in transformer oil 2 form another loops, plate heat exchanger 18 is Forced water cooling heat exchangers, be connected to cooling water pipe 16 on the

plate heat exchanger

18,17, on oil pump 20 port of export oil pipes, electric heater 19 is housed.

Operation principle: when motor starting, pass to powerful starting current on the thermistor, thereby produce a large amount of Joule heats, heat passes to transformer oil 2 in the main fuel tank 1 to reduce the temperature of electric liquid 12 in the electrohydraulic box 6 by electrohydraulic box 6, when temperature is enough high, open cooling system, return main fuel tank 1 after transformer oil process oil circulating pump 20 and heat exchanger 18 coolings; When ambient temperature is lower than zero degree, open oil pump 20 and electric heater 19, close the valve of heat exchanger 18, with the temperature of control transformer oil 2, thus the temperature of assurance thermistor.

Claims

1, a kind of oil-immersed and high-voltage starting thermistor that is used for the large and medium motor reduced voltage starting, comprise by electrohydraulic box (6), electric liquid (12), carry out the thermistor that lid oil (11), pole plate (9), respiratory chamber (10), spiracle (7) and electrode (8) are formed, it is characterized in that thermistor immerses is equipped with in the main fuel tank (1) of transformer oil (2), spiracle (7) on the electrohydraulic box (6) and electrode (8) are drawn the top cover of main fuel tank (1) by the insulating sleeve of sealing, and main fuel tank is equipped with oil conservator (4) on the top.

2, oil-immersed and high-voltage starting thermistor as claimed in claim 1, it is characterized in that being equipped with on the described main fuel tank (1) the oily circulating cooling system that communicates with transformer oil (2) wherein, this system comprises oil pump (20), electric heater (19), board-like water cooling heat exchanger (18), valve (15) and pipeline (13,14) are connected to cooling water pipe (16,17) on the board-like water cooling heat exchanger (18).

3, oil-immersed and high-voltage starting thermistor as claimed in claim 1 or 2 is characterized in that described board-like water cooling heat exchanger (18) is the air blast cooling heat exchanger, is furnished with the cooler axial flow blower.