10
R E M 61 5 A N S I 5.0 FP1
M OTO R P R OT EC T I O N A N D CO N T R O L
14) IoB measured and 3IB are always used
15) Io measured is always used
16) IoB selectable by parameter, IoB measured as default
17) Power quality option includes Current total demand distortion, Voltage total harmonic distortion and Voltage variation.
18) Available in IED and SMT but not connected to anything in logic.
19) Must be added with ACT to be available in SMT and in IED.
20) Uob measured is always used for unbalance protection with unearthed single Y connected capacitor bank.
21) The Iunb measurements values will be taken from this block and put in Measurent view.
22) Master Trip included and connected to corresponding HSO in the configuration only when BIO0007 module is used. If additionally the ARC
option is selected, then ARCSARC is connected in the configuration to the corresponding Master Trip input.
23) Only available with COM0031-0037
24) Power quality option includes only Current total demand distortion
25) Unbalance voltage measurement for capacitor bank for REV615
26) Only available with IEC 61850-9-2
LV) The function block is to be used on the low voltage side in the application
HV) The function block is to be used on the high voltage side in the application
NT) The function block is to be used on the neutral side in the application
TR) The function block is to be used on the terminal side in the application
BS) The function block is to be used on the bus side in the application
EX) This function to be excluded from the Integration Test Data generation
3. Protection functions
The relay offers all the functionality needed to man-
age motor start-ups and normal operation, also in-
cluding protection and fault clearance in abnormal
situations. The main features of the relay include
thermal overload protection, motor start-up super-
vision, locked rotor protection and protection
against too frequent motor start-ups. The relay
also incorporates nondirectional ground-fault pro-
tection, negative phase-sequence current unbal-
ance protection and backup overcurrent protec-
tion. Furthermore, the relay offers motor running
stall protection, loss-of-load supervision and phase
reversal protection.
Standard configurations B and D additionally offer
directional ground-fault protection, three-phase
undervoltage protection, negative-sequence over-
voltage and positive-sequence undervoltage pro-
tection. Further, the B and D configurations offer
frequency protection including overfrequency, un-
derfrequency and rate-of-change frequency pro-
tection modes.
The RTD/mA module offered as an option for stan
-
dard configurations A and B enables the use of the
optional multipurpose protection function for trip-
ping and alarm
purposes using RTD/mA measuring data or analog
values via GOOSE messages.
In certain motor drives of special importance there
must be a possibility to override the motor thermal
overload protection to perform an emergency start
of a hot motor. To enable an emergency hot start,
REM615 offers a forced start execution feature.
Enhanced with optional hardware and software,
the relay also features three light detection chan-
nels for arc fault protection of the circuit breaker,
busbar and cable compartment of metal-enclosed
indoor switchgear.
The arc-fault protection sensor interface is avail-
able on the optional communication module. Fast
tripping increases staff safety and security and
limits material damage in an arc fault situation. A
binary input and output module can be selected as
an option - having three high speed binary outputs
(HSO) it further decreases the total operate time
with typically 4...6 ms compared to the normal
power outputs.
4. Application
REM615 constitutes main protection for asynchro-
nous motors and the associated drives. Typically,
the motor relay is used with circuit breaker or con-
tactor controlled HV motors, and contactor con-
trolled medium sized and large LV motors in a vari-
ety of drives, such as pumps and conveyors,
crushers and choppers, mixers and agitators, fans
and aerators.
The motor relay is thoroughly adapted for ground-
fault protection. Using cable current transformers
sensitive and reliable ground-fault protection can
be achieved. Phase current transformers in
Holmgreen (summation) connection can also be
used for ground-fault protection. In that case pos-
sible unwanted operations of the ground-fault pro-
tection at motor start-up due to CT saturation can
be prevented using the relay's internal interlocking
features or a suitable stabilizing resistor in the
common neutral return.
The optional RTD/mA module offered for standard
configurations A and B facilitates the measurement
of up to eight analog signals via the six RTD inputs
or the two mA inputs using transducers. The RTD
and mA inputs can be used for temperature moni-
toring of motor bearings and stator windings, thus
expanding the functionality of the thermal overload
protection and preventing premature aging of the
motor. Furthermore, the RTD/mA inputs can be
used for measuring the ambient cooling air tem-
perature. The analog temperature values can, if re-