ABB Relion 670 Series Applications Manual page 275

1MRK 511 401-UUS F
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.
13.5 Current based delta supervision DELISPVC(7I)
13.5.1 Identification
Function description
Current based delta supervision
13.5.2 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:
• Instantaneous sample based delta detection (vectorial delta)
• True RMS value based delta detection
• DFT magnitude based delta detection
•
nd
2
•
rd
3 harmonic based adaption of starting value
Instantaneous sample based delta supervision is very fast; the delta is detected in less than a cycle
typically. This mode can be used for high impedance earth fault detection. All the other
supervision modes like RMS/DFT Mag requires minimum one cycle for delta detection.
Therefore, the choice of delta detection mode should be based on the application requirement.
Instantaneous sample based delta supervision can be used for functions that are used as
protection enabler or fault detector. For time delayed functions, other modes can be used. Current
based function can be used for load supervision also in DFT Mag based delta mode.
13.5.3 Setting guidelines
Operation : This setting is used to enable/disable the delta supervision function.
Bay control REC670
Application manual
harmonic blocking of delta function
© Copyright 2017 ABB. All rights reserved
IEC 61850 IEC 60617
identification identification
DELISPVC –
Secondary system supervision
OpMode is chosen
GUID-4F012876-FA0A-4A97-9E23-387974304CED v2
GUID-0B735A27-6A7D-40E1-B981-91B689608495 v1
ANSI/IEEE C37.2
device number
7I < >
GUID-5CEAE117-C7BA-46B6-BF24-477285050894 v2
GUID-69D28046-FAC4-4EF3-9886-F7B0F6341196 v2
Section 13
269