Toshiba GRL100-701B Instruction Manual page 258

(0.3 - 0.4Ω
0.1 - 1.0Ω
(0.5 - 5.0Ω
1.01 - 10.0Ω
(5.1 - 50.0Ω
10.01 - 20.0Ω
(50.1 - 100Ω
20.01 - 50.0Ω
(100.1 - 250Ω
50.01 - 100Ω
(250.1 - 500Ω
(*) Values shown in parentheses are in the case of 1A rating. Other values are in the case of 5A
rating.
•
Set the test voltage and test current phase relation as shown below. That is, V a , V b , and V c
are balanced, and IT lags V a by θ or θ + 180°. θ is 90 ° when testing.
V a
V c
Z1G, Z2G, and Z3G
•
Adjust the magnitude of Va while retaining the conditions above and measure the voltage at
which the element operates.
•
The theoretical operating voltage Vop is obtained by the following equations when the
setting reach is ZG. Check that the measured voltage is within the above-mentioned error of
the theoretical voltage.
Z1G, Z2G: Vop = ZG × ( IT +
Z3G, Z4G, ZRG: Vop = IT × ZG
Element ZG
Z1G
Z2G
Z3G
Z4G
ZRG
PSBGIN
PSBGOU
T
4A)
10A
2A)
5A
1A)
2.5A
0.5A)
1A
0.2A)
0.6A
0.12A)
IT
θ
V b
K xs
100
3
IT
 257 
±5%
±5%
±5%
±7%
±10%
V a
IT
V c
Z4G
− 1
× IT )
Vop Measured voltage
6 F 2 S 0 8 5 0
θ+180°
V b