Basler Electric BE1-700 - Manual (Page 57)

SECTION 4
• PROTECTION AND CONTROL
INTRODUCTION
The BE1-700 Digital Protective Relay provides the following functions that can be used to protect and
control power system equipment. C identifies a BE1-700C; V identifies a BE1-700V; A means both.
BE1-700 protection functions include:
• V Volts per Hertz Overexcitation (24)
• V Synchronism-check (25) (optional) including Conditional Voltage (25VM)
• V Three-phase Undervoltage and Overvoltage (27P/127P and 59P/159P)
• V Auxiliary Undervoltage and Overvoltage (27X and 59X/159X)
• V Negative-Sequence Overvoltage (47)
• C Instantaneous Overcurrent w/ Settable Time Delay (50TP, 50TN, 50TQ, 150TP, 150TN, 150TQ)
• C Time Overcurrent (51P, 51N, 51Q, 151N)
• V VT Fuse Loss Detection (60FL)
• A General Purpose Logic Timers (62, 162)
• V Overfrequency and Underfrequency (81, 181, 281, 381, 481, 581)
• C Breaker Failure (50BF)
BE1-700 control functions include:
• Four-shot Recloser (79) (optional) with zone-sequence coordination, sequence controlled blocking
and reclose control of setting group.
• Virtual Selector Switches (43, 143)
• Virtual Breaker Control Switch (101)
• Trip Circuit Monitor (52TM)
Two setting groups allow coordination to be adapted for changes in operating conditions. Setting groups
can be selected using programmable logic criteria.
Using Protection and Control Functions
Three steps must be taken before using a protection or control function.
1. The function logic must be enabled in the active logic scheme by the SL-<function> command.
2. Function inputs and outputs must be connected properly in a logic scheme.
3. Function characteristics or settings must be programmed and based on the specific application
requirements.
If a preprogrammed logic scheme is used in a typical application, items 1 and 2 may be skipped. Most
preprogrammed schemes are general in nature. Unneeded capabilities can be disabled by a setting of
zero. For example, if the second neutral time overcurrent function is enabled but not needed, disable it by
setting the 151N pickup setting to zero at the BESTCOMS
™ screen or by using the ASCII command S#-
151N=0,0,0.
More information about the individual function logic of item 1 is provided in this section. Information
pertaining to items 2 and 3 is available in Section 7, BESTlogic Programmable Logic, Section 8,
Application, and Section 14, BESTCOMS Software.
SETTING GROUPS
The BE1-700 Digital Protective Relay provides a normal setting group (SG0) and one auxiliary setting
group (SG1). The auxiliary setting group allows for adapting the coordination settings to optimize them for
a predictable situation. Sensitivity and time coordination settings can be adjusted to optimize sensitivity or
clearing time based upon source conditions or to improve security during overload conditions. The
possibilities for improving protection by eliminating compromises in coordination settings with adaptive
setting groups is endless. Figure 4-1 shows the setting group control logic block.
9376700990 Rev M BE1-700 Protection and Control 4-1