GE C60 Instruction Manual

Also see for C60: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

GE Multilin C60 Breaker Management Relay 5-35 SETTINGS 5.1 OVERVIEW55.1.2 INTRODUCTION TO ELEMENTSIn the design of UR relays, the term ìelementî is used to describe a feature that is based around a comparator. The com-parator is provided with an input (or set of inputs) that is tested against a programmed setting (or group of settings) to deter-mine if the input is within the defined range that will set the output to logic 1, also referred to as ìsetting the flagî. A singlecomparator may make multiple tests and provide multiple outputs; for example, the time overcurrent comparator sets aPickup flag when the current input is above the setting and sets an Operate flag when the input current has been at a levelabove the pickup setting for the time specified by the time-current curve settings. All comparators, except the Digital Ele-ment which uses a logic state as the input, use analog parameter actual values as the input.Elements are arranged into two classes, GROUPED and CONTROL. Each element classed as a GROUPED element isprovided with eight alternate sets of settings, in setting groups numbered 1 through 8. The performance of a GROUPEDelement is defined by the setting group that is active at a given time. The performance of a CONTROL element is indepen-dent of the selected active setting group.The main characteristics of an element are shown on the element scheme logic diagram. This includes the input(s), set-tings, fixed logic, and the output operands that are generated (abbreviations used on scheme logic diagrams are defined inAppendix F).Some settings for current and voltage elements are specified in per-unit (pu) calculated quantities:pu quantity = (actual quantity) / (base quantity)ï For current elements, the ëbase quantityí is the nominal secondary or primary current of the CT. Where the currentsource is the sum of two CTs with different ratios, the ëbase quantityí will be the common secondary or primary currentto which the sum is scaled (i.e. normalized to the larger of the 2 rated CT inputs). For example, if CT1 = 300 / 5 A andCT2 = 100 / 5 A, then in order to sum these, CT2 is scaled to the CT1 ratio. In this case, the ëbase quantityí will be 5 Asecondary or 300 A primary.ï For voltage elements, the ëbase quantityí is the nominal secondary or primary voltage of the VT.Some settings are common to most elements and are discussed below:FUNCTION SettingThis setting programs the element to be operational when selected as "Enabled". The factory default is "Disabled". Onceprogrammed to "Enabled", any element associated with the Function becomes active and all options become available.NAME SettingThis setting is used to uniquely identify the element.# REMOTE OUTPUTS# UserSt BIT PAIRS See page 5-92.# RESETTING# See page 5-92.## SETTINGS## TRANSDUCER I/O# DCMA INPUTS# See page 5-93.# RTD INPUTS# See page 5-94.## SETTINGS## TESTINGTEST MODEFUNCTION: See page 5-95.# FORCE CONTACT# INPUTS See page 5-95.# FORCE CONTACT# OUTPUTS See page 5-95.www . ElectricalPartManuals . com