LJZ-65(75) zero-sequence current transformer at 35kV and below,AC50Hz line.Zero sequence as the high-voltage electric power system three-phase alternator,motor over-current protection.
TRANSDUCER | |
Electrical insulation strength | zero-sequence current transformer bus ,it‘s only necessary to examine the insulating properties of the secondary coil; |
The two secondary coils | The sulation resistance between the two secondary coils of not less than 10 megohms. |
The two secondary coils |
between the two secondary coils should be able to withstand power frequency test voltage of 3kV (rms)for 1minute |
Protection sensitivity | The sensitivity of this zero-sequence current transformer shall meet the fllowing requirement |
Specification
Coil terminal symbol of zero sequence current transformer connected to DD-11/60 | DD-11/60 earthing relay | A zero sequence current | |
Coil connection | Scale value | ||
K1、K2 (a、x connect with acpacitor) |
In series | 15*1 | 1-3 |
30*1 | |||
Parallel connection | 15*2 | 2-4 | |
30*2 | |||
K1、K2 (a、x not connect with acpacitor) |
In series | 15*1 | 3-6 |
30*1 | |||
Parallel connection | 15*2 | 2-4 | |
30*2 |
Dimensions
LJZ-65(75) | ||
Accuracy test
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