Local - ABB RET670 Product Manual

Transformer protection RET670 ANSI
Pre-configured
Product version: 1.2
Single command, 16 signals
The IEDs can receive commands either from a
substation automation system or from the local
HMI. The command function block has outputs that
can be used, for example, to control high voltage
apparatuses or for other user defined functionality.
10. Logic
Tripping logic SMPPTRC (94)
A function block for protection tripping is provided
for each circuit breaker involved in the tripping of
the fault. It provides pulse prolongation to ensure a
trip pulse of sufficient length, as well as all
functionality necessary for correct co-operation with
autoreclosing functions.
The trip function block includes functionality for
evolving faults and breaker lock-out.
Fixed signal function block
The Fixed signals function (FXDSIGN) generates a
number of pre-set (fixed) signals that can be used in
the configuration of an IED, either for forcing the
unused inputs in other function blocks to a certain
level/value, or for creating certain logic.
11. Monitoring
Measurements CVMMXN, CMMXU, VNMMXU,
VMMXU, CMSQI, VMSQI
The measurement functions are used to get on-line
information from the IED. These service values
make it possible to display on-line information on
the local HMI and on the Substation automation
system about:
• measured voltages, currents, frequency,
active, reactive and apparent power and power
factor
• primary and secondary phasors
• positive, negative and zero sequence currents
and voltages
• mA, input currents
• pulse counters
20
Supervision of mA input signals
The main purpose of the function is to measure and
process signals from different measuring
transducers. Many devices used in process control
represent various parameters such as frequency,
temperature and DC battery voltage as low current
values, usually in the range 4-20 mA or 0-20 mA.
Alarm limits can be set and used as triggers, e.g. to
generate trip or alarm signals.
The function requires that the IED is equipped with
the mA input module.
Event counter CNTGGIO
Event counter (CNTGGIO) has six counters which
are used for storing the number of times each
counter input has been activated.
Disturbance report DRPRDRE
Complete and reliable information about
disturbances in the primary and/or in the secondary
system together with continuous event-logging is
accomplished by the disturbance report
functionality.
Disturbance report DRPRDRE, always included in
the IED, acquires sampled data of all selected
analog input and binary signals connected to the
function block with a, maximum of 40 analog and
96 binary signals.
The Disturbance report functionality is a common
name for several functions:
• Sequential of events
• Indications
• Event recorder
• Trip value recorder
• Disturbance recorder
The Disturbance report function is characterized by
great flexibility regarding configuration, initiating
conditions, recording times, and large storage
capacity.
A disturbance is defined as an activation of an input
to the AxRADR or BxRBDR function blocks, which
are set to trigger the disturbance recorder. All
1MRK 504 118-BUS A
ABB