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BE1-87G - General Information 1-5
SPECIFICATIONS
BE1-87G relays are available in single-phase and three-phase configurations, and with the following features
and capabilities.
Current Sensing Inputs
(5 Ampere) Nominally rated at 5 amperes, with a range of 45 to 65 hertz. Maximum
current per input: 10 amperes continuous, 250 amperes for 1 second.
(1 Ampere) Nominally rated at 1 ampere, with a range of 45 to 65 hertz. Maximum
current per input: 2 amperes continuous, 50 amperes for 1 second.
Current Sensing Burden
(5 Ampere) Burden is less than 0.05 ohms per input.
(1 Ampere) Burden is less than 0.25 ohms per input.
Stabilizing Reactor
Refer to Section 4 for stabilizing reactor impedance characteristic curves.
I
2
t Rating
(5 Ampere) 65 amperes for 1 second at 70( C ambient, (I
2
t=4225).
(1 Ampere) 13 amperes for 1 second at 70( C ambient, (I
2
t=4225).
Pickup Control
A front panel control permits minimum differential (operate) currents to be
selected. This sensitivity is constant for restraint currents less than the
nominal current (5 or 1 amperes). Actual operating characteristics are
shown in graph format in Section 5,
Testing And Setting
the relay.
(5 Ampere) Minimum differential (operate) current = 0.1, 0.15, 0.2, 0.4, 0.5, 0.8, or 1.6
amperes. The ideal operating characteristic is approximated by the
following equations.
where
I
R
is the restraint current, defined as the lesser of the input currents.
I
OP
is the operate current
I
S
is the front panel setting
For I
R
5 amperes: I
OP
= I
S
For I
R
> 5 amperes: I
OP
= I
S
+ 0.5(I
R
- 5)
(1 Ampere) Minimum differential (operate) current = 0.02, 0.03, 0.04, 0.08, 0.10, 0.16,
or 0.32 ampere. The ideal operating characteristic is approximated by the
following equations.
For I
R
1 ampere: I
OP
= I
S
For I
R
> 1 ampere: I
OP
= I
S
+ 0.5(I
R
- 1)
Pickup Accuracy
(5 Ampere) For I
R
5 amperes, ±5% of the operate pickup characteristic or 25
milliamperes whichever is greater. Actual operating characteristics are
shown in graph format in Section 5,
Testing And Setting
the relay.
For I
R
5 amperes, up to a maximum of 20 amperes, ±8% of the operate
pickup characteristic or 150 milliamperes, whichever is greater. Actual
operating characteristics for pickup values between 5 and 20 amperes are
shown in graph format in Section 5,
Testing And Setting
the relay.