Basler BE1-50/51B-229, Instruction Manual

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9252000892 Rev A BE1-50/51B-229 General Information 1-1
SECTION 1
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GENERAL INFORMATION
INTRODUCTION
BE1-50/51B-229 Overcurrent Relays are self-powered, microprocessor-based, non-directional phase or
ground relays that monitor single-phase ac current and provide accurate instantaneous and time-over-
current protection for 50 or 60 Hz power systems.
BE1-50/51B-229 relays are direct replacements for General Electric Type SFC relays. BE1-50/51B relays
offer true plug and play convenience; they can be installed in an existing SFC relay case with no wiring
changes required. Table 1-1 lists the SFC relays that can be replaced by the BE1-50/51B-229.
Table 1-1. Type SFC Relays Suitable for Direct Replacement
SFC Model Time Curve Type Output Contact Circuits
SFC151
∗∗
A
Inverse
1
SFC153
∗∗
A
Very Inverse
1
SFC177
∗∗
A
Extremely Inverse
1
∗
Represents any allowed character per GE publication GEK-36807.
An existing SFC relay is replaced with a BE1-50/51B-229 relay by performing the following simple steps.
1. Configure your new BE1-50/51-229 relay with the desired settings.
2. Remove the existing SFC relay.
3. Attach the cover adapter plate to the existing case.
4. Insert the BE1-50/51B-229 relay into the case.
5. Install the existing SFC connection plug.
6. Install the new Basler Electric relay cover.
FEATURES
BE1-50/51B-229 Overcurrent Relays have the following standard features.
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Independent time and instantaneous elements
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Secure breaker tripping from the relay front panel
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Direct-reading front panel controls
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Minimum pickup setting for safety during installation
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Time characteristics extend to a pickup multiple of 40
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Rugged draw-out construction
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Gravity latching targets retain indication without power
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Built-in accuracy eliminates internal adjustments
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Minimum transient overreach
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Field-selectable characteristic curves similar to either GE IAC or ABB type curves
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Field-selectable instantaneous or integrating reset function
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Field-selectable 50 or 60 Hz operation
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Field-selectable 0.0 or 0.1 second fixed, instantaneous time delay
Advantages
BE1-50/51B-229 Overcurrent Relays have many advantages over other overcurrent relays. The primary
advantages are listed below.
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Time characteristics are defined by equations and graphs
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Field-selectable time characteristics
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Very low burden extends the linear range of the system CTs
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Self-powered from the sensed current
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Continuous automatic calibration