Relay Connection - ISA T1000 PLUS User Manual

DOC. MIE91093
. VN = Nominal relay phase voltage: it is the nominal voltage
V divided by 1.73. For V = 100 V, then VN = 57,8 V; for V
= 110 V, VN = 62,5 V.
. IN = nominal relay current; usually, 5 A or 1 A.
. Z = fault impedance, on the secondary side.
. KoL = zero-sequence coefficient; it is a number; usually it
ranges between 0.5 and 2.
. If = fault current. The fault current If shall be greater than
the zero voltage starting current IV0, and less than IMAX,
that is computed as a function of the maximum fault
impedance to be simulated ZM, as follows:
Single phase faults: IMAX = VN / (ZM * (1 + KoL))
Phase to phase faults: IMAX = VN / (2 * ZM)
Three phase faults: IMAX = VN / ZM
If the test current is greater than IMAX, the last setting
cannot be found. Usually its value is chosen between 5 and
10 A (for IN = 5 A), or from 1 to 2 A (for IN = 1 A).
. Vf = fault voltage; it is computed as a function of Z and the
other parameters.
. Φ(I-V) = angle of the fault current with respect to the fault
voltage, taken as the reference. Typically, tests are
performed with Φ(I-V) ranging from 0° to 90°.

1.12.3. Relay connection

The first thing is to connect the three T1000 PLUS to the relay
to be tested. The connection depends upon the type of test:
single phase, phase to phase; three phase. The phase angle of
voltages will change as a function of the type of test, and also
as a function of power supply available: single phase or three
phases. The
connections.
FAULT SUPPLY
SINGLE 3 PH
1 PH
THREE 3 PH
PH 1-2 3 PH
PH 2-3 3 PH
PH 3-1 3 PH
PH 1-2 1 PH
PH 2-3 1 PH
Rev. 1.34
following table
VS1 VN1
V1 VN
V1 VN
V1 VN
V1 VN
V1 VN
VN V3
V1 VN
V1 VN
Page 90 of 145
summarizes power
VS2 VN2
V2 VN
V1 VN
V2 VN
VN V1
V2 VN
V2 VN
VN V1
V1 VN
supply
VS3 VN3
V3 VN
V1 VN
V3 VN
V3 VN
VN V2
V3 VN
V1 VN
VN V1