Basler Electric BE1-25 - Manual (Page 11)

SECTION 1 • GENERAL INFORMATION
INTRODUCTION
These instructions provide information concerning the operation and installation of BE1-25 Sync-Check
Relays. To accomplish this, the following is provided:
• Specifications
• Functional characteristics
• Mounting information
• Setting procedures and examples
Relays with a Type T power supply require a Contact Sensing Module, which comes supplied with its own
instructions, publication 9170206990.
These instructions may be used in place of all earlier editions. For change information, see Revision
History in the manual Introduction.
It is not the intention of these instructions to cover all details and variations in equipment, nor does this
manual provide data for every possible contingency regarding installation or operation. The availability
and design of all features and options are subject to modification without notice. Should further
information be required, contact Customer Service, Basler Electric Company, Highland, IL.
DESCRIPTION
The BE1-25 is a solid-state synchronism check relay designed to permit breaker closure when the desired
maximum phase angle conditions have held for a specified minimum time. The maximum allowable phase
angle and time delay requirements can be set on front panel thumbwheel switches. Five voltage
measuring options are available that identify significant line and bus voltage conditions, and this
information is used to influence the relay output.
APPLICATION
BE1-25 Sync-Check Relays are recommended for situations that require verification of synchronism prior
to closing a circuit breaker. Typical applications are:
• Paralleling a generator to a system.
• Reestablishing a connection between two parts of a power system.
• Supervising fast transfer schemes, where fast pickup and dropout of the phase measuring circuit
are required.
If optional voltage measuring circuits are incorporated, the BE1-25 can determine whether an input is live,
dead, or in an overvoltage state.
WARNING!
To avoid personal injury or equipment damage, only qualified personnel should
perform the procedures presented in these instructions.
NOTE
Voltage sensing circuits are guaranteed to operate at a minimum voltage of 60
volts. They are guaranteed not to operate at voltages less than 20 volts. Some
units may operate at voltages in between these two levels because of the
individual characteristics of specific components. Minimum voltage detection is
usually in the range of 45 to 55 volts
9170200990 Rev U BE1-25 General Information 1-1