
In the following equations, restrain voltage is the magnitude
of the minimum phase-to-phase voltage in secondary volts.
The set operate value in secondary amperes is calculated according to the
following equations:
First part of the characteristic (Restrain voltage ≤ 25% of
UBase
):
StartCurr
IBase
CT
CTprim
VDepFact
100
100
×
×
×
sec
IECEQUATION2432 V1 EN-US
(Equation 80)
Second part of the characteristic (25% of
UBase
≤ Restrain voltage ≤
UHighLimit
/100*
UBase
), valid when setting parameter
VDepMode
=
Slope
:
StartCurr
IBase
CT
CTprim
VDepFact
UH
100
1
100
×
×
×
−
sec
iighLimit
UBase
VT
VTprim
strainVoltage
−
(
)
×
×
×
−
×
25
100
25
100
sec
Re
U
UBase
VT
VTprim
StartCurr
IBase
×
+
×
×
sec
100
C
CT
CTprim
VDepFact
sec
×
100
IECEQUATION2433 V1 EN-US
(Equation 81)
Third part of the characteristic (
UHighLimit
/100*
UBase
≤ Restrain voltage):
StartCurr
IBase
CT
CTprim
100
×
×
sec
IECEQUATION2434 V1 EN-US
(Equation 82)
Example (rated secondary current = 1A):
CT ratio
10 000/1A
VT ratio
10 kV/100 V
StartCurr
100%
VDepFact
25%
UHighLimit
100%
IBase
10 000 A
10 kV
A test for each section of the characteristic of the function VRPVOC may be
performed; that may be achieved by applying the following voltages:
First section of the characteristic:
If
VDepMode
=
Slope
, the minimum measured phase-to-phase voltage is
lower than 0,25*
UBase
; if
VDepMode
=
Step
, the minimum measured phase-
to-phase voltage is lower than
UHighLimit
/100*
UBase
:
•
UL1: Ampl = 10 / √3; Angle = 0°
•
UL2: Ampl = 10 / √3; Angle = 240°
•
UL3: Ampl = 100 / √3; Angle = 120°
Second section of the characteristic only:
If
VDepMode
=
Slope
, the minimum measured phase-to-phase voltage is
between 0,25*
UBase
and
UHighLimit
/100*
UBase
:
Section 9
1MRK 506 383-UEN A
Testing functionality by secondary injection
120
Line distance protection REL650 2.2 IEC
Commissioning manual
Содержание REL650 series
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