ABB Relion 670 Series Applications Manual page 212

Section 13
Secondary system supervision
The vector shift detection also protects synchronous generators from damaging due to islanding
or loss-of-mains.
13.3.4 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
as phase to ground , this setting is taken as 50% of the set value.
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
DelUang> : This setting is used for angle based delta detection. This setting could be used to
detect islanding condition. A typical setting of 8-10 deg. is good to detect a major islanding
condition.
DeltaT : This setting defines the number of old cycles data to be used for delta calculation in
RMS/DFT Mag and angle mode. Typical value is 2 cycles. This value is not used if
as instantaneous 1 cycle or instantaneous 2 cycle.
tHold : This setting defines the pulse length for supervision start signal. Typical value is 100 ms.
13.4 Current based delta supervision DELISPVC(7I)
13.4.1 Identification
Function description
Current based delta supervision
13.4.2 Application
In power system networks, fault detection and operation of other protection functions is reliably
done by delta supervision functionality. Single phase networks are an important application of
delta supervision. In this type of network, a delta based release criteria is used to release the
protection funciton. The measurement of delta differs from country to country between
magnitude, vector or sample based detection.
In this function, a current based delta supervision is implemented in a phase segregated design.
The delta function has the following features:
206
Instantaneous 1 cycle old . Load supervision can be done using vector shift mode
IEC 61850
identification
DELISPVC
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UBase . If the MeasMode setting is set
UBase to use this function as fault detection.
IEC 60617 ANSI/IEEE C37.2
identification device number
– 7I < >
Phasor measurement unit RES670
1MRK 511 407-UUS Rev. J
GUID-9356F1C8-9EBA-43E3-8445-CB74E12BC57E v2
OpMode is chosen
GUID-4F012876-FA0A-4A97-9E23-387974304CED v2
GUID-0B735A27-6A7D-40E1-B981-91B689608495 v1
GUID-5CEAE117-C7BA-46B6-BF24-477285050894 v2
Application manual