Technical Specification As Per IS : 2705
|General Particulars||11KV||33 KV|
Highest System Voltage( H.S.V.)
|12 KV ( r.m.s.)||36 KV (r.m.s.)|
|Power frequency dry/ wet withstand voltage on primary winding for one minute||28 KV ( r.m.s.)|
70 KV ( r.m.s.)
|Lightning Impulse withstand Voltage ( 1.2 x 50 μs )||75 KV ( r.m.s.)|
170 KV ( r.m.s.)
|PD measuring Voltage / Permissible Voltage||7.6/50||23.0/50|
|Rated Transformation Ratio|
As per customer requirement (in Amp.)
|Rated Primary Current||Upto 2000 Amp.|
|Rated Secondary Current|
1 Amp. 5 Amp. 0.577 Amp.
|Short Time Thermal Current (Ith)|
As per customer requirement.
In general CT is to be specified with STF of 100 for 1 Sec. or STC (lth) equal to the system fault level whichever is lower. KA ( r.m.s. )
|Ith duration||5 to 3.0 Second|
|Short Time Dynamic Current|
2.5 X Ith KA (Peak)
|Number of Cores||Upto 3 cores|
|Output Burden||Upto 60VA, 0.8 pf Lagging|
For Metering :
0.2S, 0.2, 0.5S, 0.5, 1.0 & 3.0.
5P, 10P, 15P & PS
|IAF, ALF, Knee Point Voltage, Exciting Current & Resistance|
As per customer requirement / Design Constraints
|Type of construction|
Epoxy Resin cast suitable for different panels.
Constructional / Salient Features
Transformer is to be unpacked fully before carrying out site tests. Before energizing, all the secondary terminals not in use are to be short circuited and grounded. Primary connection is to be tightened sufficiently to avoid hot connection.