Toshiba S2E21 - Page 55

TOSHIBA
6F9EOlll
Item
Test method
Decision Test
circuit
(single
phase)
Qperat- Slowly reduce the
75% rtlO% of the rated Figure 16
ing
current and measure
current (IN)
point the current value at
JB
which the relay trips.
Clperat- 1) Apply the rated
Less than 4 s. Figure 16
ing
current (IN).
time
2) Quickly change
current in one phase
to 0 and measure the
time it takes for
the relay to trip.
Unbal- 1) Apply the rated
ante
current (IN).
factor
I II - IAVE I x loo%
IN
Figure 16
2) Change current in The calculated value must be
one phase and
within *5% of the setting
measure the current value.
at which the relay
trips.
Example: When the setting
value is 30%. the
calculated value
must be in the
range of 25 to 35%.
--
--
1 I: Measured current value.
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