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 LJ2,4,7current transformer

Description and meaning of model

The series of zer-sequence current transformer for rated frequency 50Hz generator or condenser over the same period in the neutral point non-effectively grouded system groud fault protection,this series transformer with the relay DD11/60 type,when the scope of protectionwithin a ground fault.Residual current in the transformer secondary circuit.When the current reaches a certain value,the relay action.

Characteristic of structure

Series transformer with high permeability toroidal core.And annealing process,the secondary winding around the two sections in the core clamping core folder support transformer termial block and groud bolt and mounting hole in the folder on the folder on the user's three-phase cable through the core window.Transformer primary winding.

Technical Data

1.Rated insulation level 12/42/75kV(surface condensation and artificial class II filthy conditions)

2.the load power factor 0.8lag

3.Rated secondary current of 5A

4.product standard:GB1208 the

5.Safety factor:FS<10

6.Surface creepage distance:to meet the gradeII pollution class requirements

7.Other parameters see table below

Type Allowed to cross the cable number(root) Secondary total impedance Connect the relay model Relay setting current Protection sensitivity Frequency test voltage
LJ-2 1-2 <10 DD11/60 0.03 1-3 2
LJ-4 3-7 <10 DD11/60 0.03 1-3
LJ-7 5-7 <10 DD11/60 0.03 1-3
LJ1 1 <10 DD11/60 0.03 1-3
Outline dimension

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