Protection Functions - ABB RELION 615 Series Product Manual

Transformer Protection and Control
RET615
Product version: 5.0 FP1
Table 2. Supported functions, continued
Function
RTD/mA measurement
Frequency measurement
IEC 61850-9-2 LE sampled value sending
IEC 61850-9-2 LE sampled value receiving
6)7)
(voltage sharing)
Other
Minimum pulse timer (2 pcs)
Minimum pulse timer (2 pcs, second resolution)
Minimum pulse timer (2 pcs, minute resolution)
Pulse timer (8 pcs)
Time delay off (8 pcs)
Time delay on (8 pcs)
Set-reset (8 pcs)
Move (8 pcs)
Generic control point (16 pcs)
Analog value scaling (4 pcs)
Integer value move (4 pcs)
1, 2, ... = Number of included instances. The instances of a protection function represent the number of identical protection function blocks available in the standard
configuration.
() = optional
HV = The function block is to be used on the high-voltage side in the application.
LV = The function block is to be used on the low-voltage side in the application.
1) "Io calculated" is always used.
2) IoB calculated is always used.
3) "IoB measured" is always used.
4) Master trip is included and connected to the corresponding HSO in the configuration only when the BIO0007 module is used. If additionally the ARC option is selected, ARCSARC is
connected in the configuration to the corresponding master trip input.
5) "IoB calculated" and "3IB" are always used.
6) Available only with IEC 61850-9-2
7) Available only with COM0031-0037

3. Protection functions

The relay features three-phase, multi-slope stabilized (biased)
stage transformer differential protection and an instantaneous
stage to provide fast and selective protection for phase-to-
phase short circuit, winding interturn fault and bushing flash-
over protection. Besides second harmonic restraint, an
advanced waveform-based blocking algorithm ensures stability
at transformer energization and a fifth harmonic restraint
function ensures good protection stability at moderate
overexcitation of power transformers. Sensitive restricted
earth-fault protection completes the overall differential
protection providing detection of even single phase-to-earth
faults close to the neutral earthing point of the transformer.
Either the conventional high-impedance scheme or a numerical
low-impedance scheme can be selected for protection of the
transformer windings. When low-impedance restricted earth-
fault protection is used neither stabilizing resistors nor varistors
are needed and as a further benefit the transforming ratio of the
neutral earthing CTs can differ from those of the phase current
transformers. Due to its unit protection character and absolute
selectivity restricted earth fault does not need to be time-
graded with other protection schemes, and therefore high
speed fault clearance can be achieved.
14
IEC 61850 A
XRGGIO130 (1)
FMMXU
SMVSENDER
6)7)
SMVRCV
TPGAPC 4
TPSGAPC 1
TPMGAPC 1
PTGAPC 2
TOFGAPC 4
TONGAPC 4
SRGAPC 4
MVGAPC 2
SPCGAPC 2
SCA4GAPC 4
MVI4GAPC 1
B C D
(1) (1) (1)
4 4 4
1 1 1
1 1 1
2 2 2
4 4 4
4 4 4
4 4 4
2 2 2
2 2 2
4 4 4
1 1 1
The relay also incorporates a thermal overload protection
function, which supervises the thermal stress of the transformer
windings to prevent premature aging of the insulation of the
windings. Multiple stages of short circuit, phase overcurrent,
negative-sequence and earth-fault backup protection are
separately available for both sides of the power transformer.
Earth-fault protection based on the measured or calculated
residual voltage is also available. Depending on the chosen
standard configuration the relay also features three-phase
overvoltage protection, three-phase undervoltage protection
and residual overvoltage protection. Further, the relay also
offers circuit breaker failure protection.
Enhanced with optional hardware and software, the relay also
features three light detection channels for arc fault protection of
the circuit breaker, busbar and cable compartment of metal-
enclosed indoor switchgear.
The arc-fault protection sensor interface is available 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.
1MRS756891 M
E F G
(1) (1) (1)
1 1 1
(1) (1) (1)
(1) (1) (1)
4 4 4
1 1 1
1 1 1
2 2 2
4 4 4
4 4 4
4 4 4
2 2 2
2 2 2
4 4 4
1 1 1
H
(1)
1
(1)
(1)
4
1
1
2
4
4
4
2
2
4
1
ABB