36~550kV Oil-filled Current Transformers 

                      
LB-Series upright type ， Oil-filled current transformers is applied for metering and protect in 36~550kV High-voltage power transmission system.
——The features of the equipment comply with IEC 60044-1
——Modern and compact design，good insulation performance，high mechanical strength
——There are various options on output and accuracy class
——The most modern manufacturing technology on oil-paper-insulation manufacture
——Strict quality control and routine inspection

Main technical parameters
Highest system voltage: 36~550kV
Rated frequency: 50Hz or 60 Hz
Polarity：Negative
Rated primary current: 1~3000A
Rated secondary current: 1A or 5A
Accuracy class of the windings for measurement: 0.2S, 0.2, 0.5S, 0.5
Accuracy class of the windings for protect: 5P, 10P, 5PR, 10PR, TPY, TPS, TPX, TPZ
No. of the secondary windings: 1~8
Rated output: 5~50VA
Security factor of the instrument (Fs):5, 10
Accuracy limit coefficient：5, 10，15，20，25，30，40

Accuracy limit conditions of the PR class:
a. Symmetrical multiple of the short time current Kssc=20 or 25
b. Time constant of primary windings Tp: 100ms
c. Direct Current Amount of short circuit current 100% (full migration)
d. Stipulated operating cycle
C-0.1S-O-0.5S-C-0.1S-O
or C-0.1S-O-0.4S-C-0.1S-O
e. The guaranteed transient error time during reclosing：40ms or 50ms
f. Remanence coefficient≤0.1