Toshiba GRL100-701B Instruction Manual page 255

Reach setting
0.01 - 0.05Ω
(0.1 - 0.2Ω
0.06 - 0.09Ω
(0.3 - 0.4Ω
0.10 - 1.00Ω
(0.5 - 5.0Ω
1.01 - 10.00Ω
(5.1 - 50.0Ω
10.01 - 20.00Ω
(50.1 – 100.0Ω
20.01 - 50.00Ω
(100.1 – 250.0Ω
(*) Values shown in parentheses are in the case of 1A rating.
Other values are in the case of 5A rating.
•
Set the voltage and current phase relationship as shown below. That is, V a lags Vc by 90°, Vb
= - V a and IT lags V a by θ or θ + 180°. θ is 90° when testing.
V b
Z1S, Z2S, Z3S and PSB
•
Adjust the magnitude of V a and V b while retaining the conditions above and measure the
voltage V a at which the element operates.
• The theoretical operating voltage is obtained by 2IT × ZS when the setting reach is ZS. Check
that the measured voltage is within the above-mentioned error of the theoretical voltage value
when it is expressed with 2V a (= V a − V b ).
Element reach setting (ZS)
Z1S
Z2S
Z3S
Z4S
ZRS
PSBSIN
PSBSOUT
IT
25A
5A)(*)
20A
4A)
10A
2A)
5A
1A)
2.5A
0.5A)
1A
0.2A)
V c
90°
V a
θ
IT
2IT × ZS
IT
 254 
Error
±10%
±7%
±5%
±5%
±5%
±7%
V c
IT
V b
θ + 180°
Z4S
Measured voltage (2V )
a
6 F 2 S 0 8 5 0
V a