Toshiba GRT100 Series Instruction Manual page 122

6.5.1.4 High-set overcurrent element HOC
Operating current value
The testing circuit is shown in Figure 6.5.1.
The output signal numbers of the HOC elements are as follows:
 Press 4 (= Logic circuit) on the "Test" sub-menu screen to display the "Logic circuit"
screen.
 Enter a signal number 41 to observe the HOC-A output at monitoring jack A and press the
ENTER key.
 Apply a test current to A-phase current terminals and change the magnitude of the current
applied and measure the value at which the element operates.
Check that the measured value is within 7% of the following value.
Operating value = (CT secondary rated current)  (kh setting)
Operating time
The testing circuit is shown in Figure 6.5.4.
 Set a test current to 2 times of HOC operating current (= CT secondary rated current  kh
setting)
 Apply the test current and measure the operating time.
 Check that the operating time is 25 ms or less.
Element Signal number
HOC-A 41
HOC-B 42
HOC-C 43
 121 
6 F 2 S 0 7 8 9