Contact Us
stone

Phone Number : 008615195010186

Aging and Life Assessment of Oil-immersed Power Transformer

April 26, 2019

The aging mechanism of insulating material and factors influencing aging of oil-immersed power transformer are summarized,characteristics of aging mechanism in the courses of thermal aging,electrical aging,mechanical stress and multi- stress aging are concluded.

What are the Aging reasons of Oil-immersed Power Transformer?

In the long-term operation of transformer, insulation aging will be caused by electric field, moisture, temperature and mechanical force.

transformer corrugated fin wall tank

oil-immersed power transformer tank with corrugated fin wall

Oil-immersed Power Transformer Life assessment

Polymerization degree (DP) of transformer insulation material is the most accurate, reliable and effective criterion for insulation aging degree. According to the average degree of polymerization of insulated cardboard to judge the aging degree of transformer, we adopt the following criteria.

Evaluation Criteria of Average Polymerization Degree of Insulating Paper

Classified life-level hazard level

Average DP < 450 < 250

1) The index of life level is that the maximum residual tensile strength of insulating paper can be withstood reaches 60% of the initial value when the external short circuit occurs; the dangerous level is that the maximum residual tensile strength reaches 15% of the initial value.

2) The criteria of DP failure probability of Japanese insulating paper fibers are as follows: 1) DP > 450, failure probability = 0; 2) 450 > DP > 250, failure probability =( 450 – DP) / 200; 3) 250 > DP, failure probability = 1.

3) The residual life of transformer is estimated by average DP, i.e. nL/n0= (1 – r) L, where n0 is the starting value of average DP; nL is the average DP after L; L is the number of years; R is the average decline rate of DP.

More information about our Transformer Tanks, Corrugated Fins wall& Radiators,Full Auto Corrugated Fins Forming&Welding Machines, please feel free to contact with us : cnkylt@aliyun.com

Transformer Tank Cooling Wall Production line:

Automatic Corrugated Fins Wall Manufacturing Line

Home>Corrugated Fins Wall Machinery>Automatic Corrugated Fins Wall Manufacturing Line

CORRUGATED FIN FOLDING AND WELDING MACHINES

CORRUGATED FIN FOLDING AND WELDING MACHINES

Corrugated Fins Wall Forming Machine

Home>Corrugated Fins Wall Machinery>Corrugated Fins Wall Forming Machine

corrugated fins wall making machine

corrugated fins wall making machine

Full-auto PLC Corrugated Fins Seam Welding Machine

Home>Corrugated Fins Wall Machinery>Full-auto PLC Corrugated Fins Seam Welding Machine

corrugated fins wall seam welding machine

corrugated fins wall seam welding machine

Hydraulic Decoiler

Home>Corrugated Fins Wall Machinery>Hydraulic Decoiler

steel roll feeding machine

steel roll feeding machine

Corrugated Fins Wall Leak Testing Machine

Home>Corrugated Fins Wall Machinery>Corrugated Fins Wall

corrugated fins wall leakage testing machine

corrugated fins wall leakage testing machine

Want to know more?(Marketing Title)

Phone: 008615195010186

Email: cnkylt@aliyun.com