Delta V And Delta I; Dead Line Detection; Voltage Based Delta Supervision Delvspvc(78V); Identification - Hitachi Relion 670 Series Applications Manual

1MRK511407-UUS Rev. N
13.2.3.5

Delta V and delta I

Set the operation mode selector OpDVDI to Enabled if the delta function shall be in operation.
The setting of DVPU should be set high (approximately 60% of VBase) and the current threshold DIPU
low (approximately 10% of IBase) to avoid unwanted operation due to normal switching conditions in the
network. The delta current and delta voltage function shall always be used together with either the
negative or zero sequence algorithm. If VSet
the primary current for operation of dI/dt, the setting of DVPU and DIPU will be given according to
equation
DVPU
=
EQUATION1765-ANSI V2 EN-US
DIPU
=
ANSIEQUATION2385 V2 EN-US
The voltage thresholds VPPU is used to identify low voltage condition in the system. Set VPPU below the
minimum operating voltage that might occur during emergency conditions. A setting of approximately
70% of VBase is recommended.
The current threshold 50P shall be set lower than the IMinOp for the distance protection function. A
5...10% lower value is recommended.
13.2.3.6

Dead line detection

The condition for operation of the dead line detection is set by the parameters IDLDPU for the current
threshold and UDLD< for the voltage threshold.
Set the IDLDPU with a sufficient margin below the minimum expected load current. A safety margin of at
least 15-20% is recommended. The operate value must however exceed the maximum charging current
of an overhead line, when only one phase is disconnected (mutual coupling to the other phases).
Set the VDLDPU with a sufficient margin below the minimum expected operating voltage. A safety
margin of at least 15% is recommended.
13.3

Voltage based delta supervision DELVSPVC(78V)

13.3.1

Identification

Function description
Voltage based delta supervision
Phasor measurement unit RES670
Application manual
103 and equation 104.
VSet
prim
⋅100
VBase
ISet
prim
⋅100
IBase
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is the primary voltage for operation of dU/dt and ISet
prim
IEC 61850 IEC 60617
identification identification
DELVSPVC –
Secondary system supervision
GUID-02336F26-98C0-419D-8759-45F5F12580DE v7
(Equation 103)
(Equation 104)
GUID-579ED249-B8C9-4755-9E80-28E2BA8E5377 v2
GUID-C7108931-DECA-4397-BCAF-8BFF3B57B4EF v2
ANSI/IEEE C37.2
device number
7V_78V
Section 13
prim
M13683-78 v4
191