Basler Electric BE1-50/51B-244 - Manual (Page 11)

9252000793 Rev C BE1-50/51B-244 General Information 1-1
SECTION 1 • GENERAL INFORMATION
Introduction
BE1-50/51B-244 protective relays are direct replacements for Westinghouse type CO relays. The BE1-
50/51B-244 has a 5-ampere current sensing input. The BE1-50/51B-244 is provided with a case that fits
into an FT-11 cutout or an FT-21 cutout with an adapter plate (Basler P/N 9252017005). A cover is also
provided. Compatible Westinghouse model numbers are listed in Table 1-1.
Table 1-1. Westinghouse Relays Suitable for Direct Replacement
ABB Catalog Number Curve Type
CO-2∗11∗1N Short Time
CO-5∗11∗1N Long Time
CO-6∗11∗1N Definite
CO-7∗11∗1N Moderately Inverse
CO-8∗11∗1N Inverse
CO-9∗11∗1N Very Inverse
CO-11∗11∗1N Extremely Inverse
∗ Any digit covering all pickup ranges except 50 Hz models.
To replace an existing Westinghouse type CO relay, perform the following steps:
1. Select the desired relay settings on your new BE1-50/51B-244 relay.
2. Remove the existing relay and case.
3. Insert the new relay and case.
4. Install the connection plug.
5. Install the cover and secure with the captive thumbnut.
BE1-50/51B-244 relays are self-powered, compatible with 50 or 60 Hz power systems, and have three
protection elements: one time overcurrent (51) element and two instantaneous overcurrent (50) elements.
The 51 element offers timing characteristic curves similar to those used by GE IAC relays.
Features
A wide range of pickup settings and front panel selectable time characteristics permit applications
involving coordination with fuses, reclosers, cold load pickup, motor starting, and fixed time requirements.
In addition, an integrating reset function is available to simulate the disk reset of electromechanical relays.
BE1-50/51B-244 overcurrent relays have the following standard features:
• Independent time and instantaneous elements
• A secure method to manually trip the breaker at the relay front panel
• Direct reading front panel controls
• Minimum pickup setting for safety during installation
• Time characteristics extend to a pickup multiple of 40
• Rugged draw-out construction with steel case
• Gravity latching targets retain indication without power
• Built-in accuracy eliminates internal adjustments
• Minimum transient overreach
• Field-selectable characteristic curve selection similar to GE IAC or Westinghouse CO type curves
• Field selectable instantaneous or integrating reset
• Field selectable 50 or 60 Hz operation
• Field selectable 0.0 or 0.1 second, fixed, instantaneous delay
Internal switches provide for selecting system-operating frequencies of 50 or 60 Hz, instantaneous
element delays of 0.0 or 0.1 second, characteristic curve group selection for either GE IAC or