EQUATION2293-ANSI V2 EN (Equation 172)
where:
3I0PU
is the maximal zero sequence current during normal operating conditions, plus a margin of 10...20%
IBase
is setting of global base current all functions in the IED.
10.2.3.5 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
VSetprim is the primary voltage for operation of dU/dt and ISetprim the primary current
for operation of dI/dt, the setting of DVPU and DIPU will be given according to equation
173 and equation 174.
EQUATION1765-ANSI V1 EN (Equation 173)
ANSIEQUATION2385 V1 EN (Equation 174)
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.
10.2.3.6 Dead line detection
The condition for operation of the dead line detection is set by the parameters IDLDPU for
the current threshold and VDLDPU for the voltage threshold.
Section 10 1MRK 506 334-UUS A
Secondary system supervision
280
Application manual
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