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5-4 BE1-87G - Testing And Setting
NOTE
Output contacts may be NC or NO, depending on style of relay. Check continuity at
terminals 1 and 10 with relay tripped and not tripped to assure correct response for the
type of contacts specified.
Single-Phase Trip And Dropout Test
Step 1. Connect the test setup for phase A in accordance with Figure 5-1.
Step 2. Set the sensitivity switch to A.
Step 3. Apply appropriate power input voltage to terminals 3 and 4.
Step 4. Using a regulated current source that is independently adjustable, apply the restraint current (0.1
ampere, sensing input range 1 or 0.02 ampere, sensing input range 2) to phase A terminals 6 and 9.
Step 5. Slowly increase the operate current source to phase A terminals 6 and 8 until the relay trips. Trip
should occur at (0.1 ampere, sensing input range 1 or 0.02 ampere, sensing input range 2), ±(5% or
25 milliamperes), whichever is greater.
Step 6. Slowly decrease the operate current source until dropout. Reset must occur at a value of current that
is greater than or equal to 90% of I
s
(sensitivity switch setting value).
Step 7. Repeat steps 2 through 6 for the other sensitivity switch settings. If desired, a sufficient number of trip
points may be taken to verify any or all of the performance curves shown in Figure 5-4. For I
R
nominal (5 amperes, sensing input range 1 or 1 ampere, sensing input range 2), the tolerance is
±(0.05 I
OP
or 25 milliamperes, whichever is greater.) For I
R
nominal up to a maximum of 20 amperes
(sensing input range 1) or 4 amperes (sensing input range 2), the tolerance is ±0.08 I
OP
on the
characteristic curve or 150 milliamperes, whichever is greater. See Figures 5-4 through 5-7 for the
operating characteristic curves and trip response timing curve.