BE1-50 General Information
1-1
SECTION 1 • GENERAL INFORMATION
APPLICATION
General
Instantaneous overcurrent relays provide phase and ground fault protection for distribution circuits,
generators, motors, transformers, and other major components of power systems. BE1-50 Instantaneous
Overcurrent Relays have a wide range of pickup settings and input configurations to accommodate
protection requirements for power systems. BE1-50 relays are available in single- or multi-phase for power
units. Some applications are illustrated in Figure 1-1.
Figure 1-1. Typical BE1-50 Applications
Ground Fault Detection
BE1-50 relays can be applied to monitor zero sequence currents that are indicative of ground faults. The
most sensitive method of ground fault protection utilizes a single current transformer through which all the
conductors are passed (Figure 1-1b). Another method uses the residual connection of the three-phase CTs
(Figure 1-1d) with the relay set higher than the normal system unbalance. The most direct method is to
place a CT in the neutral of a grounded wye connection for equipment such as power transformers or
generators (Figure 1-1c).
Phase Fault Detection
BE1-50 relays can be used in two ways to detect phase faults. The first method is to place an instantaneous
overcurrent element in each phase with the setting higher than expected load current for any power system
Summary of Contents for BE1-50
Page 1: ... 05647 6 10 07 14 056 06 0 175 18 4 744 06 4 Publication 9 1710 00 990 Revision C 11 98 ...
Page 5: ...iv BE1 50 Introduction CONTENTS Continued SECTION 7 MANUAL CHANGE INFORMATION 7 1 Changes 7 1 ...
Page 12: ...2 2 BE1 50 Human Machine Interface Figure 2 1 Location of Controls and Indicators ...
Page 20: ...BE1 50 Installation 4 5 Figure 4 7 S1 Case Single Ended Panel Drilling Diagram Rear View ...
Page 21: ...4 6 BE1 50 Installation Figure 4 8 S1 Case Double Ended Panel Drilling Diagram Rear View ...
Page 22: ...BE1 50 Installation 4 7 Figure 4 9 Outline Dimensions Rear View ...
