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1BPROTECTION FUNCTIONS
PROTECTION, CONTROL AND METERING FUNCTIONS
Chapter 2. PROTECTION, CONTROL AND METERING FUNCTIONS
This chapter describes the protection, control and measurement functions of the smART P500
multifunction relay. All settings are related to secondary values, but proART communications
software can show them as primary or secondary units, depending on the user’s election.
2.1. PROTECTION FUNCTIONS
2.1.1. PHASE OVERCURRENT PROTECTION
2.1.1.1. GENERAL DESCRIPTION
The protection element performs a continuous comparison between the pickup value
and the measured value. If the measured value is greater than de pickup value the
operation time is calculated from the selected curve. If the current reaches a value
below the configured pickup value, before the operation time is elapsed then the relay
will return to its normal operation status.
The following configurable characteristics (function 50/51) are available for the
Overcurrent protection functions of the three phases, neutral and sensitive neutral
2.1.1.2. TIME OVERCURRENT ELEMENTS (51P)
Functions for phase overcurrent protection, neutral overcurrent protection and
sensitive neutral overcurrent protection, are available. The settings for these
functions are shown in Table 2-1 Time characteristics
Curve type
Family
IEC 255-4, BS142
Standard Inverse.
Very Inverse
Extremely Inverse
Short Time Inverse
Long Time Inverse
ANSI C37.90
Standard Inverse
Very Inverse
Extremely Inverse
Moderately Inverse
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...