Basler Electric BE1-BPR - Manual (Page 25)

9272000990 Rev J BE1-BPR Application 2-1
SECTION 2 • APPLICATION
GENERAL
BE1-BPR relays have seven inputs and five outputs plus an alarm output. There are three general
purpose overcurrent fault detectors, six multipurpose timers, a three-shot recloser, and special outputs
that are internally generated by the microprocessor. Using simple Boolean expressions, the user can
logically connect the various functional blocks to create a custom, application specific, logic scheme to
handle special protection requirements.
Standard model relays have the following special features:
• Three shot recloser.
• Pre-insertion breaker resistor operations counter with programmable reset and block reclose signal.
• Six configurable timing diagnostic logs each with an optional alarm setting. This feature can be used
to monitor the various protection system parameters such as the margin between normal breaker
operation and breaker fail.
Enhanced model relays have the standard model features plus these special features:
• Twelve entry fault log detailing the system and relay status at the time the fault trigger occurred
• Twelve entry COMTRADE fault record consisting of configuration (CFG) and data (DAT) files. The
COMTRADE data contains 4 cycles of pre-fault and 16 cycles of post-fault data sampled at 12
samples per cycle. Each sample consists of the analog-to-digital converter values for each current
channel as well as 32 digital channels (a digital channel is for the digital status of an input, output, or
alarm).
• Integrated I 2 t breaker contact duty monitor with alarm.
A minimum of three basic breaker failure schemes are pre-programmed into nonvolatile memory. These
schemes take full advantage of the special features available in this relay without requiring the user to do
any programming. The user only selects the scheme desired and enters the pickup and timer settings.
APPLICATION DATA
Contact Sensing Inputs
Each BE1-BPR relay provides seven opto-isolated contact sensing inputs. Three inputs (IN1-3) are each
completely isolated. Inputs 4 and 5 (IN4, IN5) share one common terminal and inputs 6 and 7 (IN6, IN7)
share another common terminal. Each input has programmable recognition and debounce (time allowed
for the external contacts to stabilize) times. Typically the default setting of four milliseconds recognition
and twelve millisecond debounce should be used unless extremely slow or irregular contacts are applied.
The default setting assures that the signal be present on at least two consecutive scans of the input
status before recognition can occur.
It is recommended that for protective functions, a positive TRUE logic be used to enable protective
outputs. This prevents a broken wire or loose connection from causing a protective trip. For example, a
52b input would be preferred for protection logic that is enabled when the breaker opens (i.e. block
reclose or breaker arcing/flash over) and a 52a input would be preferred for protection logic that should
be enabled when the breaker closes. On the other hand, for a diagnostic alarm, a negative TRUE logic
may be preferred since it will give an alarm if the checked diagnostic occurs and also give an alarm
(depending on the logic) for a bad or broken connection.
Fault Detectors
BPR relays provide three independent fault detectors. Each fault detector can be programmed for phase
or neutral input sensing. Also, each fault detector can be setup to operate as an instantaneous (50) or
moving average filter (MAF) fault detector.
An instantaneous fault detector provides a typical one cycle pickup and one-quarter cycle dropout for high
speed operation. A three cycle software delay is imposed on any Type 1 fault detector when the current
Instantaneous (50) Fault Detector Type 1