zlogo
   

 

 

POTENTIAL TRANSFORMERS are commonly used to supply meters and measurement relays. Select according to VA capacity required.

 

VA

75

145

150

295

500

750

VOLTAGE TRANSFORMER GROUPS

Group 1: Transformers for applications with 100% of rated primary voltage connected to the primary terminals; either, line-to-line or line-to-ground. These transformers are capable of operating at 125% of rated volts in emergency conditions, but cannot exceed 65% of their thermal burden rating to a limit of 75oC temperature rise. This will result in reduced life expectancy. Continuous operation at 110% of rated voltage is permissible provided that the thermal rating is not exceeded.

Primary Voltage Rating Ratio B.I.L.
(kV peak)
120 for 208Y 1:1 10
240 for 416Y 2:1 10
300 for 520Y 2.5:1 10

Group2: These are for line-to-line connection but may be connected line-to neutral not exceeding the rated line voltage divided by the square root of 3. Continuous operation at 110% of rated voltage is permissible provided that the thermal rating is not exceeded.

Primary Voltage Rating Ratio B.I.L.
(kV peak)
120 for 208Y 1:1 10
240 for 416Y 2:1 10
300 for 520Y 2.5:1 10
480 for 480Y 4:1 10
600 for 600Y 5:1 10
BURDEN DATA
Burden VA PF PF Angle (degrees)
W 12.5 0.1 84.3
X 25 0.7 45.6
M 35 0.2 78.5
Y 75 0.85 31.8
Z 200 0.85 31.8
ZZ 400 0.85 31.8