ABB Relion 670 Series Applications Manual page 274

Section 13
Secondary system supervision
V3P*
BLOCK
ANSI18000903 V1 EN-US
Figure 108: DELVSPVC connection diagram
The vector shift detection guarantees fast and reliable detection of mains failure in almost all
operational conditions when a distributed generation unit is running in parallel with the mains
supply, but in certain cases this may fail.
If the active and reactive power generated by the distributed generation units is nearly balanced
(for example, if the power mismatch or unbalance is less than 5...10%) with the active and reactive
power consumed by loads, a large enough voltage phase shift may not occur which can be
detected by the vector shift algorithm. This means that the vector shift algorithm has a small non-
detectionzone (NDZ) which is also dependent on the type of generators, loads, network and start
or operate value of the vector shift algorithm.
Other network events like capacitor switching, switching of very large loads in weak network or
connection of parallel transformer at HV/MV substation, in which the voltage magnitude is not
changed considerably (unlike in faults) can potentially cause maloperation of vector shift
algorithm, if very sensitive settings are used.
The vector shift detection also protects synchronous generators from damaging due to islanding
or loss-of-mains.
13.4.3 Setting guidelines
Operation : This setting is used to enable/disable the delta supervision function.
Umin : The minimum start level setting should be set as % of UBase . This setting enables the
function to start detecting delta. Typical setting is 10% of
phase to ground , this setting is taken as 50% of the set value.
as
MeasMode : This setting is used to detect the mode of measurement; phase to phase or phase to
ground .
OpMode : This setting is used to select the mode of operation. For protection applications, this
should be set to
or DFT mag mode.
DelU> : This setting is used to detect the start value for instantaneous sample, RMS, DFT mag
based delta detection. Set a typical value of 50% of
268
DELVSPVC (78V)
BFI_3P
PICKUP_A
PICKUP_B
PICKUP_C
STRISE
STRISE_A
STRISE_B
STRISEL3
STLOW
STLOW_A
STLOW_B
STLOWL3
DELMAG_A
DELMAG_B
DELMAGL3
Instantaneous 1 cycle old . Load supervision can be done using vector shift mode
© Copyright 2017 ABB. All rights reserved
78V Pickup
AND
ANSI18000903‐1‐en.vsdx
UBase to use this function as fault detection.
GUID-9356F1C8-9EBA-43E3-8445-CB74E12BC57E v2
UBase . If the MeasMode setting is set
Bay control REC670
1MRK 511 401-UUS F
Application manual