Primary End To End Test - ISA T1000 PLUS User Manual

DOC. MIE91093
generation on the auxiliary output: the currents add, and
produce a second harmonic distorted current. This current is
applied to one of the relay inputs.
100 Hz
I
2
Test procedure:
Connect the two currents to the relay input;

Increase I1 only until the relay trips;

Then increase Aux to increase the current from D1000

or TD1000, until the relay trip drops out.
Take note of the two currents and calculate the 2
 H : the harmonic percentage is, with D1000:
%

H
%
Iac
Or, with TD1000:
I 2

H
%

2
I 1
1.16 P
RIMARY END TO END TEST
The purpose of the test is the check the complete protective
scheme of a line differential relay, including the CTs. This kind
of test is particularly complex and requires a big effort in the
coordination of two teams of technicians at both ends of a line.
Rev. 1.34
I1 + I2
50 Hz
I
1
Ext _ I
*

2 2
Ext _ I
* 100
2
I 2
A a
B b
C c
N n
100
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nd
Harm %