|Place of Origin:||China|
|Brand Name:||Pearl Electric|
|Certification:||KEMA, CE, CCC, ISO9001|
|Model Number:||PEC-S, SC(B) 9-15|
|Minimum Order Quantity:||1 unit|
|Packaging Details:||Seaworthy wooden packing|
|Delivery Time:||30days-50days ex-work|
|Payment Terms:||T/T, L/C|
|Supply Ability:||9000 units per year|
20kV - 100kVA Cast Resin Dry Type Transformer , Three Phases , Two Winding , Power Distribution
Made of high-quality grain orientation cold rolled silicon steel sheet, it adopts 45° full-inclined joint structure and five-grade stepping.
2. Pouring coil:
It adopts F grade insulated copper conductor as the conductor, with glass fiber and epoxy resining composite material for insulation.
3. Foil type coil:
It is automatically winded by foil type coil winding machine and adopts argon shield technology to perform internal welding.
Adopting the entire section of copper foil, with the F-class turn insulation, low voltage winding is wound by the special low-voltage foil winding machine. The foil coil resolves such understanding problems as large short-circuit stress, uneven ampere turn, poor heat dissipation, existing the winding spiral angle as well as unsteady manual welding quality due to low voltage and large current coil winding products. At the same time, the winding end in our company is treated with resin potting, solidification to make shape, moisture-proof and anti-fouling. The lead copper platoon is automatically welded by argon arc welding.
Cast Resin Dry Type Transformer, Low Noise, Low Loss and Low Partial Discharge.
|I Basic Information|
|1||Rated Voltage ratio||kV||20kV / 0.433 kV|
|1.02||Applicable Standards||IEC 60076|
|1.04||Country of Origin||China|
|II Electric Performance|
|2.06||Insullation Class||Class H|
|2.07||Temperature Rise (@40℃ ambient temperature)||K||125K|
|2.14||Load Loss (@120℃)||W||1670|
|2.15||Local Partial discharge||pC||<10PC|
|2.16||Impulse Withstand Voltage (HV/LV)||kV||75/0|
|2.17||Power Frequency Withstand Voltage|
|2.18||Rated Duration of Short Circuit||s||2|
|III Materials & Accessories|
|3.01||Core Materials||Silicon Steel Sheet|
|3.02||Winding Materials||Copper conductor/foil|
|3.03||Insulation methods||HV vacuum cast / LV impregnant|
|3.04||Main Insulation Materials||Epoxy Resin|
|3.06||Sensor for Temperature Alarm and Trip||pcs||Yes, contact provided|
Ageing and transformer insulation lifetime
Experience indicates that the normal lifetime of a transformer is some tens of years. It cannot
be stated more precisely, because it may vary even between identical units, owing in
particular to operating factors, which may differ from one transformer to another. With few
exceptions a transformer rarely operates at 100 % of rated current throughout its lifetime.
Other heating factors such as insufficient cooling, harmonics, over fluxing and/or unusual
conditions as described in 60076-11 could also affect the life of the transformer.
When heat, which is mainly due to the transformer losses, is transferred to the insulation
system, a chemical process begins. This process changes the molecular structure of the
materials which form the insulation system. The ageing rate increases with the amount of heat
transferred to the system. This process is cumulative and irreversible, which means that the
materials do not regain their original molecular structure when the heat supply stops and the
temperature decreases. The thermal index of the insulation system is stated in the manufacturer’s documentation and is also written on the rating plate. It is assumed that failing insulation due to ageing is one of the causes of end of lifetime of the transformer.
Further it is assumed that the ageing rate varies with temperature according to the Arrhenius’
equation. See Annex A for additional background information. The two constants in Arrhenius’
equation should ideally be determined by means of thermal endurance testing. In cases where
data from such testing is missing, this guide provides estimated constants, which are
calculated on the basis of the following assumptions:
– a temperature increase of 6 K doubles the ageing rate. 6 K is an estimated value for the
whole winding linked with the value of specific materials used in the winding;
– another value for this doubling rate should be used when supported by thermal endurance
tests on the complete electrical insulation system (EIS), according to IEC 60216-1;
– insulation failures are the cause of end of life of the transformer.
GB/T10228 , GB1094.11 , IEC60076-11 , DIN42523
|Core:||Silicon Steel Sheet||Cooling:||AN Or Customized|
|Capacity:||100KVA Or Customized||Rated H. V.:||20Kv Or Customized|
|Rated L. V.:||0.433kv Or Customized||Impedance:||4% Or Customized|