Auxiliary Transformer

Auxiliary transformer saving cost and enviromental-friendly

• Reduced potential faults without negative impact.
• Increased monitoring and safety of the power system
• High durability and reliability
• High short-circuit withstand ability with NOMEX paper
• Long lifespan
• Maintenance-free under normal service conditions
• Lower noise

Related product parameters

Technical Specifications
Type	oil immersed
Power	up to 2000kva
Voltage	up to 36KV
Current	3000A
Duty seconds	10/30/60 or others
Cooling method	ONAN, AF
Frequency	50/60Hz
Standard	IEC60076
Vertor group	ZNyn1
Installnation	indoor /outdoor
Ambient Temperature	-30 +55 ℃

In areas where an earth point is not readily available or difficult to acquire, a neutral point can be created using an earthing transformer. Earthing transformers, incorporate a zig-zag (interstar) winding feature that is used to achieve the required zero phase impedance stage, providing the desired neutral earthing conditions. Additionally, auxiliary windings are often provided according to auxiliary power supply requirements.

FACTORY TEST

For each transformer are prepared and issued a test report, in accordance with IEC 60076. except for routine tests, we also offer type tests and specialized tests to meet all customer requirements. We make what matters work for our customers in a safe and reliable way.

Routine test

Measurement of winding resistance
Measurement of voltage ratio and check of phase displacement
Measurement of short-circuit impedance and loss
Measurement of no-load loss and current
Dielectric routine tests
Tests on on-load tap-changers, where appropriate
Leak testing with pressure for liquid-immersed transformers(tightness test)
Tightness tests and pressure tests for tanks for gas-filled transformers
Check of the ratio and polarity of built-in current transformers
Check of core and frame insulation for liquid immersed transformers with core or frame insulation

Type test

Temperature-rise type test
Dielectric type tests
Determination of sound level for each method of cooling for which a guaranteed sound level is specified
Measurement of the power taken by the fan and liquid pump motors
Measurement of no-load loss and current at 90% and 110% of rated voltage

Special Test

Dielectric special tests
Winding hot-spot temperature-rise measurement
Determination of capacitances windings-to-earth, and between windings
Measurement of dissipation factor(tanδ) of the insulation system capacitances
Determination of transient voltage transfer characteristics
Measurement of zero-sequence impedance(s) on three-phase transformers
Short-circuit withstand test
Measurement of d.c. insulation resistance each winding to earth and between windings
Vacuum deflection test on liquid immersed transformers
Pressure deflection test on liquid immersed transformers
Vacuum tightness test on site on liquid immersed transformers

Contact information

Emailsales@varelen.com Tel+86 19373185639 Fax+86 731 84371029 Phone/WeChat+86 19373185639

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Oil Immersed Transformers