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Static inductor with switch for converter of tapping on load

A transfer switch, inductor technology, applied in the direction of inductors, variable inductors, transformer/inductor cooling, etc., can solve the problem of poor contact of the transfer switch part, wear of the tap selector part metal, and reduced insulation properties, etc. problem, to achieve the effect of superior fire resistance

Inactive Publication Date: 2009-03-18
JAPAN AE POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the method described in Patent Document 1, when liquid silicone is used in the changeover switch part, since the liquid silicone polymerizes to form an insulating material when an arc is generated, contact failure in the changeover switch part may occur.
In addition, in the case of using liquid silicone for the tap selector part, if liquid silicone with poor lubricating properties of the sliding movement par

Method used

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  • Static inductor with switch for converter of tapping on load
  • Static inductor with switch for converter of tapping on load
  • Static inductor with switch for converter of tapping on load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0047] (Examples 1-5), (Comparative Examples 1-5)

[0048] The load tap changer 16 roughly includes a changeover switch unit 17 and a tap changer unit 18 . In Examples 1 to 5, as the changeover switch unit 17 , a vacuum switch type load-time tap changer using a vacuum switch was employed. figure 2 A schematic diagram of a tap changer for a vacuum switched load is shown in . exist figure 1 and figure 2 Among them, a transformer in which a primary winding 3 and a secondary winding 4 are wound on an iron core 2 is accommodated in a tank 1 containing liquid insulation and cooling medium. The coiled wire is inserted into the insulating barrel 5 . The iron core 2 is firmly fastened by the insulators 11, 12, 13, 14 and the fastening metal parts 10a, 10b located at the upper and lower ends of the winding wires. In addition, the LTC chamber is sealed with dry air using a dehumidifier, or the LTC chamber is formed as a sealed space against outside air for disaster prevention, and...

Embodiment 6～9

[0071] In Examples 6-9, in figure 1 In the transformer with a load-time tap changer as an embodiment of the present invention, a load-time tap changer using a current-limiting resistor as the changeover switch unit 17 is used. image 3 A schematic diagram of a tap changer with a resistive load is shown in . In the resistive load tap changer, the changeover switch unit 17 uses the insulating medium 19a. In Examples 6 to 9, polyol ester oil was used as an insulating medium in the tap selector unit. Table 2 shows the insulating medium used for the tap selector unit, and Table 3 shows the insulating medium used for the changeover switch.

[0072]

[0073] 【table 3】

[0074] table 3

[0075]

Change the insulation medium of the switch part

insulating medium

Viscosity (mm 2 / s)

at 40°C body of insulating medium

Product resistivity

(Ω cm) in

at 80°C insulating medium

burning point

(℃) Example 6 Pentae...

Embodiment 10)、( comparative example 5～9

[0079] The flammability of the insulating medium was evaluated by a calorific value measuring device (Conkaroli-Meter-). Table 4 shows the results of measuring the maximum heat release rate when 50 kW / m2 of heat radiation was applied to each insulating medium.

[0080] 【Table 4】

[0081] Table 4

[0082] insulating medium Maximum heat release rate (kW / m 2 ) Example 10 Dimethicone / Pentaerythritol Branched Chain Mixed Fatty Acid Ester

A=90wt% / 10wt%

242 Comparative example 5 mineral oil 1410 Comparative example 6 Dimethicone liquid viscosity 20mm 2 / s at 25°C 230 Comparative Example 7 Dimethicone liquid viscosity 50mm 2 / s at 25°C 203 Comparative Example 8 Pentaerythritol branched mixed fatty acid ester A 770 Comparative Example 9 Pentaerythritol branched mixed fatty acid ester C 744

[0083]Compared with mineral oil, it can be seen that the maximum heat release rate of synthetic polyol ester is lower...

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PUM

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Abstract

The invention provides an on-load tap changer attached stationary induction apparatus with excellent flame resistance and long running stability, characterized by including a tank, an electromagnetic induction device which is put, together with a liquid insulating material having a flash point higher than 250 DEG C, in the tank, and an on-load tap changer for adjusting the voltage of the electromagnetic induction device, wherein the on-load tap changer has a changeover switch section and a tap selector section, and the following medium is filled as an insulating medium at least for the tap selector section: a silicone liquid to which one or more polyol esters having a flash point higher than 250 DEG C and represented by the following formulae (1), (2), (3) and/or (4) are added: (R1-CH2)2C(CH2-O(CO)-R2)2 (1) R1-CH2-C(CH2-O(CO)-R2)3 (2) C(CH2-O(CO)-R2)4 (3) (R2-(CO)O-CH2)3C-CH2-O-CH2-C(CH2-O(CO)-R2)3 (4) wherein R1 represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and R2 represents one or more alkyl groups having 5 to 12 carbon atoms.

Description

technical field [0001] The present invention relates to a stationary inductor including a flame retardant liquid which is provided with a load-time tap changer and uses a flame retardant liquid insulator as an insulating and cooling medium. Background technique [0002] Conventionally, insulating oil such as mineral oil has been used as the insulation and cooling medium of transformers for stationary inductors using insulation and cooling medium. [0003] By using a flame retardant silicone liquid instead of the mineral oil as the insulation and cooling medium of the transformer, the fire resistance of the transformer can be improved. Along with this, fire resistance is also required for the load-time tap changer installed in the transformer for voltage regulation. [0004] The load-time tap changer is mainly composed of a changeover switch unit and a tap selection unit. Patent Document 1 describes an on-load tap changer using ester oil or liquid silicone with a flash poin...

Claims

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Application Information

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IPC IPC(8): H01F29/04
CPCH01F29/04H01F27/105H01F27/08
Inventor 师冈寿至山岸明白坂行康三瓶宏幸鹫山雄树
Owner JAPAN AE POWER SYST