User`s guide

V3-T9-238 Volume 3—Power Distribution and Control Assemblies CA08100004E—November 2013 www.eaton.com
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9.4
Metering Devices, Protective Relays, Software and Connectivity
Protective Relays
Features, Benefits and Functions
●
Flexible phase and ground
differential protection for
two winding transformers,
large motors and
generators
●
Complete protection and
control in a single compact
case to reduce panel
space, wiring and costs
●
Integral test function
reduces maintenance
time and expense
●
Zone selective interlocking
improves coordination and
tripping time, and saves
money compared to a
traditional bus differential
scheme
●
Reduce troubleshooting
time and maintenance
costs. Trip and event
recording in non-volatile
memory provides detailed
information for analysis
and system restoration.
6000 cycles of waveform
capture aids in post fault
analysis (viewable using
PowerPort-E software)
●
Minimum replacement
time. Removable terminal
blocks ideal for industrial
environments
●
Front RS-232 port and
PowerPort-E software
provides local computer
access and user-friendly
Windows-based interface
for relay settings,
configuration and
data retrieval
●
Breaker open/close from
relay faceplate or remotely
via communications
●
Fast an easy
troubleshooting, improved
maintenance procedures
and increased device
security. Provides detailed
traceability for system
configuration changes
●
Relays self-diagnostics and
reporting improves uptime
and troubleshooting
●
Breaker trip circuit
monitoring improves the
reliability of the breaker
operation
Features
Protection Features
●
Dual-slope percentage
restrained current
differential with
magnetizing inrush and
overexcitation blocking
(87R)
●
Unrestrained current
differential (87H)
●
Restricted ground fault/
Ground Differential (87GD)
●
Phase overcurrent
(elements can be assigned
to either side of the
transformer):
●
Four instantaneous
elements with timers
(50P[1], 50P[2], 50P[3]
and 50P[4])
●
Four inverse time
overcurrent elements
(51P[1], 51P[2], 51P[3]
and 51P[4])
●
11 standard curves
●
Inrush Blocking
●
Instantaneous or time
delay reset
●
Negative sequence phase
overcurrent (elements can
be assigned to either side
of the transformer):
●
Two inverse time
overcurrent elements
(51Q[1] and 51Q[2])
●
11 standard curves
●
Instantaneous or time
delay reset
●
Ground overcurrent
(elements can be assigned
to either side of the
transformer):
●
Two instantaneous
measured elements
with timers (50X[1]
and 50X[2])
●
Two instantaneous
calculated elements
with timers (50R[1]
and 50R[2])
●
Two inverse time
overcurrent measured
elements (51X[1]
and 51X[2])
●
Two inverse time
overcurrent calculated
elements (51R[1]
and 51R[2])
●
11 standard curves
●
Instantaneous or time
delay reset
●
Two breaker failure
elements (50BF[1]
and 50BF[2])
●
Phase transformer
overload protection (49)
●
Switch onto fault
protection
●
Cold load pickup
●
Zone interlocking for bus
protection (87B)
Metering Features
●
Amperes: positive,
negative and zero
sequence
●
Ampere demand
●
Current phase angles
●
% THD I
●
Magnitude THD I
●
Minimum/maximum
recording
●
Trending
●
RTD Temperatures with
remote URTD
Monitoring Features
●
Trip coil monitor for both
primary and secondary
breakers
●
Breaker wear primary and
secondary (accumulated
interrupted current)
●
Oscillography
(6000 cycles total)
●
Fault data logs
(up to 20 events)
●
Sequence of events report
(up to 300 events)
●
Clock (1 ms time stamping)
Control Functions
●
Breaker open/close both
breakers
●
Remote open/close
●
Programmable I/O
●
Programmable LEDs
●
Multiple setting groups
●
Cold load pickup
●
CT supervision
Communication Features
●
Local HMI
●
Password protected
●
Addressable
●
IRIG-B
●
Local communication port
●
Remote communication
port:
●
RS-232
●
RS-485
●
Protocols:
●
Modbus-RTU
●
Modbus-TCP (Optional)
●
Configuration software
Protection and
Control Functions
Eaton’s ETR-4000
transformer protection
relay has been designed for
maximum user flexibility and
simplicity. The ETR-4000 is
suitable for application on
small, medium and large two
winding power transformers.
Multiple current inputs are
used to provide primary
protection, control and
back-up protection of
transformers, including
current differential, restricted
ground differential and
overcurrent protection.
Dual-Slope Percent Differential
Protection
The primary protective
element for transformer
protection is the percent
differential element, which
compares the current
entering the primary and
leaving the secondary of the
transformer. The ETR-4000
has built in compensation
for the turns-ratio and the
phase shift of the
transformer, so it's not
necessary to compensate for
the transformer connection
by the connection of the CTs.
The current differential
element looks at the vector
difference between the
current entering and leaving
the zone of protection. If the
difference exceeds a pre-
determined amount, the
element will operate.
The operating characteristic
of the percent differential
element is a dual-slope
characteristic to
accommodate for CT
saturation and CT errors.
Dual-Slope Operating Characteristic