Earthing Transformer

Auxiliary transformer saving cost and enviromental-friendly

•Earthing transformer lower Maintenance by adopting superior age-resistant seals

• 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
• zigzag earthing transformer Short Circuit Current :25A-2000A/10s. 30s .60s As Optional

Related product parameters

Technical Specifications
Type	Oil-type: up to 123 kV (BIL: 450 kV class) Dry-type: up to 36 kV (BIL: 170 kV class) With auxiliary winding on request.
Power	up to 2000kva
Voltage	up to 36KV
Current	3000A
Duty seconds	10/30/60 or others
Cooling method	ONAN, AF
Frequency	50/60Hz
Transformer oil	Mineral oil, FR3 oil, Silicon oil ，Midel 7131 and other oil as required by customers
Paint corrosion resistance	C4 and C5-M
Standard	IEC , AS, EN, IEEE, GOST
Vertor group	ZNyn1 ZIAZIG ZN0 zyn11
Installation	indoor /outdoor
Ambient Temperature	-30 +55 ℃

oil immersed Earthing transformer, the design have Variable shape,Terminal Box Can design from Top also can from side.The Netural Bushing can be also in the same termimal with HV

Earthing transformer Design and modeling diversification

earthing transformer Short Circuit Current

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