On Load Tap Changer Distribution Transformer With OLTC

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The 35KV class S9 oil immersed On Load Tap Changer transformers produced by our company are:

SZ9-2000/35/10      SZ9-2500/35/10       SZ9-3150/35/10

SZ9-4000/35/10      SZ9-5000/35/10       SZ9-6300/35/10

SZ9-8000/35/10      SZ9-10000/35/10     SZ9-12500/35/10

SZ9-16000/35/10     SZ9-20000/35/10     SZ9-25000/35/10

The 35KV class S11 OIL COOLED On Load Tap Changer transformers produced by our company are:

SZ11-2000/35/10         SZ11-2500/35/10         SZ11-3150/35/10

SZ11-4000/35/10         SZ11-5000/35/10         SZ11-6300/35/10

SZ11-8000/35/10         SZ11-10000/35/10       SZ11-12500/35/10

SZ11-16000/35/10       SZ11-20000/35/10       SZ11-25000/35/10

SZ11 2000-31500kVA 35kV On-Load Voltage Regulating Power Transformer Technical Parameter:

Standards:

GB1094.1 "Power Transformers Part 1 General Provisions";

GB1094.2-1996 "Power Transformer Part 2 Temperature Rise";

GB1094.3-2003 "Power Transformer Part 3 Insulation Level, Insulation Test and External Insulation Air Gap"

GB1094.4-2003 "Power Transformer Part 10 Sound Level Identification"

GB/T6451-2008 "Technical parameters and requirements of oil-immersed transformers" and entrusted requirements

GB1094.5-2003 "The ability of power transformers to withstand short circuit"

GB/T15164 "Load Guidelines for Oil-immersed Power Transformers"

IEC76 "Power Transformer"

GB2536 "Transformer Oil"

Introduction of 35KV power transformer and distribution transformer:

This series of products is relatively advanced in design, and has been greatly improved and improved in material, structure and process. The high and low pressure clamps are tightened by steel straps or upper beams and side beams to form a solid frame structure, which enhances the clamping force of the iron core and the ability to withstand transportation shocks. It has strong short-circuit resistance, beautiful appearance, reliable operation, low loss and low noise, reaching the advanced level of similar foreign products. 

Structural features of 35KV electrical power transformers:

Foil coil: The low-voltage wire winding adopts a whole section of copper foil, and is wound on a special low-voltage foil winding machine together with the F-class turn insulation. Foil coils solve the problems of low voltage and high current coils with large short-circuit stress, unbalanced ampere-turns, poor heat dissipation effect, winding helix angle and unstable manual welding quality. At the same time, the winding ends of our company are encapsulated with resin, cured and formed, which is moisture-proof and anti-fouling. The lead copper bar is automatically welded by argon arc welding.

Temperature control device: The transformer adopts signal thermometer, and the temperature measuring element is embedded in the upper part of the low-voltage coil, which can automatically detect and display the respective working temperatures of the phase coils. And has over temperature alarm and trip function.

Indication of insulation level:

Transformer insulation levels are graded. An example of the representation method of insulation level is as follows: the insulation level of a transformer with a high voltage rated voltage of 35kV and a low voltage rated voltage of 10kV is expressed as LI200AC85/LI75AC35, where LI200 indicates that the transformer’s high-voltage lightning impulse withstand voltage is 200kV, and the power frequency withstand voltage is 200kV. It is 85kV, the low-voltage lightning impulse withstand voltage is 75kV, and the power frequency withstand voltage is 35kV.

Interpretation of the connection group label of the transformer:

According to the phase relationship of the first and second windings of the transformer, the transformer windings are connected into various combinations, which are called the connection group of the windings. In order to distinguish different connection groups, the clock notation is often used, that is, the phasor of the high-voltage side line voltage is used as the long needle of the clock, fixed on 12, and the phasor of the low-voltage side line voltage is used as the short needle of the clock, see where the short needle points. A number is used as the label of the connection group. For example, Dyn11 indicates that the primary winding is a (delta) connection, and the secondary winding is a (star) connection with a center point, and the group number is (11) points.

Our company has adopted the following effective methods to improve the short-circuit resistance of the transformer

The introduced international advanced technology fully considers the various situations of the product when it is subjected to short circuit and solves it in a targeted manner, and adopts a series of measures such as rigid positioning of the body on six sides to maintain the overall stability of the product.

The design adopts dynamic force calculation to assess the dynamic and thermal stability of the product; a separate voltage regulating coil is set up to strictly ensure the ampere-turn balance of the high and low coils, while maintaining the consistency of the magnetic centers of the high, low and voltage regulating coils to minimize the short-circuit electric power;

The low-voltage coil is directly routed to the high-strength bobbin, and the high, low and voltage regulating coils are wound with radial and axial compression devices, and the outer diameter side adopts locking struts to increase radial direction firmness;

The coil is vacuum-dried under pressure and fully assembled. During the reassembly process, the height of the coil is repeatedly adjusted to ensure that the final high and low pressure coil heights are completely consistent, that is, the coil is processed stably. All pads are pre-densified, chamfered and deburred, and the pressing parts of the body are evenly arranged to ensure mechanical strength and sufficient pressing force to improve the axial strength of the coil.

When winding high-voltage, low-voltage and voltage-regulating coils, ensure that the geometric dimensions of the coils themselves are accurate, the dimensions of each coil in the assembly center and other components are closely matched, and the paper tube and the iron core are firmly supported by support rods, and the coils are assembled. A series of combined processes are adopted to bind and strengthen the radial direction, and each part will not shift and deform when it is subjected to short-circuit electric power.

The leads are fixed and encrypted, and the components adopt a self-locking and anti-loose structure to meet the dynamic and thermal stability during short circuit.

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