Hitachi Relion 670 Series Applications Manual page 202

Section 11
Secondary system supervision
11.3 Voltage based delta supervision DELVSPVC
11.3.1 Function revision history
Document
revision
C
D
E
F
G
H
M
N
11.3.2 Identification
Function description
Voltage based delta supervision
11.3.3 Application
In single phase networks, fault detection and operation of other protection functions is reliably done
by delta supervision functionality. Single phase traction networks are an important application of delta
supervision. In this type of network, typically for catenary protection, a delta based release criteria is
used to release the trip signal. The measurement of delta differs from country to country between
magnitude, vector or sample based detection.
In this function, a voltage based delta supervision is implemented in a phase segregated design. The
delta function has the following features:
• Instantaneous sample based delta detection
• True RMS value based delta detection
• DFT magnitude based delta detection
• Vector shift protection
The Delta detection mode is selected on the basis of application requirements. For example,
Instantaneous sample based delta supervision is very fast; the delta is detected in less than a cycle
typically. Hence, instantaneous sample based delta supervision can be used for functions that are
used as protection enablers or fault detectors
All the other supervision modes like RMS/DFT Mag or Angle requires minimum one cycle for delta
detection and can be used for time delay functions.
11.3.4 Setting guidelines
Operation: To enable/disable the delta supervision function.
196
Product History
revision
2.2.2 -
2.2.3 The function's initial blocking of 11 cycles is removed. For the first time changed delta
from zero signal value to a value higher than the minimum level and if this change is
higher than delta level settings, then the function will release the start signal.
2.2.3 -
2.2.4 -
2.2.4 -
2.2.5 -
2.2.6 -
2.2.6 -
IEC 61850
identification
DELVSPVC
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GUID-579ED249-B8C9-4755-9E80-28E2BA8E5377 v2
GUID-383C6822-E9FC-475E-82B3-0D4E247AEF72 v3
GUID-C7108931-DECA-4397-BCAF-8BFF3B57B4EF v2
IEC 60617 ANSI/IEEE C37.2
identification device number
– 7U
GUID-D179DBA4-B068-4A1E-A53E-477BD3B6ACFC v2
GUID-9356F1C8-9EBA-43E3-8445-CB74E12BC57E v3
Railway application RER670
1MRK506375-UEN Rev. N
Application manual