20 kV - 125kVA Cast Resin Dry Type Transformer , Three Phases , Two Winding , Power Distribution
1. It can be directly installed at the load center, which is free of maintenance and install conveniently, therefore it has low comprehensive running cost.
2. With high moisture resistance, it runs normally at the moisture and can be put into operation without being dried after outage, with low loss and local discharge capacity.
3. It has small noise, strong short circuit resistance and excellent environmental performance, and can run under severe environmental condition.
4. It is safe, fire-retardant, fireproof and environment-friendly.
The hoisting, tooling and testing equipment is complete. Pearl Electric has passed the ISO9001-2015 international standard quality management system certification. Adopting advanced technology and high quality raw material, with first class equipment and strict processing, SC-series resin casting dry type transformer. All performance indicators of the products have reached the relevant national standards and international standards.
Pearl Electric's products are universally used in different industries, involving power plants, chemicals, construction, mining, metallurgy, rail transportation and so on. We do utmost to meet the needs of various users.
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|
|1.03||Manufacturer|| ||Pearl Electric|
|1.04||Country of Origin|| ||China|
|II Electric Performance || || |
|2.06||Insullation Class|| ||Class H|
|2.07||Temperature Rise (@40℃ ambient temperature)||K||125K|
|2.08||Cooling Method|| ||AN|
|2.09||Tapping Ranging|| ||±2*2.5%|
|2.1||Vector Group|| ||Dyn11|
|2.14||Load Loss (@120℃)||W||1960|
|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|
1 Current and temperature limitations
With loading values beyond the nameplate rating, the hot-spot winding temperature shown in
Table 3 shall not be exceeded and the specific limitations given in 4.3 and 5.12 shall be taken
The current magnitude is limited to 1,5 Ir especially when the cycle is short and repeated to
avoid mechanical damage in the winding. Values over 1,5 Ir shall be specified at the enquiry
stage and shall be agreed upon between purchaser and manufacturer. For all other types of
cycles the current is limited to 1,5 Ir .
Table 3 – Current and temperature limits applicable to loading
beyond nameplate rating
Insulation system temperature (°C) 105 (A) 120 (E) 130 (B) 155 (F) 180 (H)200
Maximum current (p.u.) 1,5 1,5 1,5 1,5 1,5 1,5 1,5
Highest temperature for hot-spot (°C) 130 145 155 180 205 225 245
NOTE 1 The temperature and current limits are not intended to be valid simultaneously. The current may be limited to a lower value than shown in order to meet the temperature limitation requirement. Conversely, the temperature may be limited to a lower value than shown in order to meet the current limitation requirement.
NOTE 2 The calculation shows that at the highest hot-spot temperature shown in the table the lifetime of a
new transformer is only few thousand hours.
2 Other limitations
2.1 Magnetic leakage field in structural metallic parts
The magnetic leakage field increases with increasing current. This field may cause excessive
temperatures in structural metallic parts that may restrict the overloading. The limits on load
current, hot-spot temperature and temperature of structural metallic parts other than windings
and leads stated in Table 2 should not be exceeded. It should be noted that when the hot-spot
temperature exceeds the highest temperature in Table 2 according to the insulation classes of
the transformer, the characteristics of the insulation system decrease to a level below the
minimum value for the dielectric withstand of the transformer.
GB/T10228 , GB1094.11 , IEC60076-11 , DIN42523