StartCurr
IBase
CT
CTprim
100
×
×
sec
IECEQUATION2434 V1 EN
(Equation 91)
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
:
•
UL1: Ampl = 50 / √3; Angle = 0°
•
UL2: Ampl = 50 / √3; Angle = 240°
•
UL3: Ampl = 100 / √3; Angle = 120°
Last section of the characteristic:
If
VDepMode
= either
Slope
or
Step
, the minimum measured phase-to-phase
voltage is higher than
UHighLimit
/100*
UBase
:
•
UL1: Ampl = 105/ √3; Angle = 0°
•
UL2: Ampl = 105/ √3; Angle = 240°
•
UL3: Ampl = 105 / √3; Angle = 120°
4.
Inject the voltages that are related to the first part of the characteristic, and then
slowly increase the phase current IL1 from 0.0 A up to the value the function
operates. The START and STOC signals must be activated when the amplitude
of the phase current IL1 is slightly above 0.25 A on the secondary side. The
corresponding trip signals TROC and TRIP will be activated after the pre-set
time delay has expired.
5.
Decrease the current IL1 slowly and note the reset value.
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
172
Generator protection REG670 2.0 IEC
Commissioning manual
Summary of Contents for REG670 2.0 IEC
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