1BPROTECTION FUNCTIONS
PROTECTION, CONTROL AND METERING FUNCTIONS
Negative sequence voltage. Here the V
2
and I
2
of the system are used for the
comparison.
As in the before mentioned cases the angular difference is obtained and the trip
decision is made according to its relative position respective to the trip zone and the
configuration of the relay.
Figure 2-11shows the logical diagram for this function.
Figure 2-11 Logical diagram for the forward/backward directionality.
2.1.5. NEGATIVE SECUENCE OVER-CURRENT ELEMENTS
2.1.5.1. GENERAL DESCRIPTION
Negative sequence instantaneous/definite-time overcurrent protection (46DT, 46IT)
reacts to the module of the negative sequence component of the phase current.
c
I
a
b
I
a
a
I
I
•
•
•
3
2
2
+
+
=
where a=1
120º
∠
Figure 2-12 shows the logical diagram for the time negative sequence overcurrent
protection.
Direction
Control
rFltFwdPa, rFltFwdPb,
rFltFwdPc, rFltFwdN,
rFltFwdG
Sensibility
Angle
Directionality
Calculation
rFltRevPa, rFltRevPb,
rFltRevPc, rFltRevN,
rFltRevG
I
A
/I
B
/I
C
/I
N
/I
NS
V
A
/V
B
/V
C
Summary of Contents for smART P500
Page 1: ...Instruction Manual Multifunction Protection Relay smART P500...
Page 23: ...2BTABLES INDEX THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY...
Page 39: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 9 Wye Wye Connection measured neutral...
Page 40: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 10 Wye Wye Connection sensitive neutral...
Page 41: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 11 Open Delta Connection measured neutral...
Page 42: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 12 Open Delta Connection sensitive neutral...
Page 511: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 6 Moderately ANSI curve...
Page 513: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 7 Very inverse ANSI curve...
Page 515: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 8 Extremely inverse ANSI curve...
Page 532: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 14 Recloser Curves 101 119...
Page 535: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 15 Recloser Curves 120 142...
Page 538: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 16 Recloser Curves 151 202...