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ABB REL670 Operator's Manual

Manual is about: Line distance protection

Summary of REL670

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    Relion ® 670 series line distance protection rel670 ansi operator's manual.

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    Document id: 1mrk506276-uus issued: june 2010 revision: b product version: 1.1 © copyright 2010 abb. All rights reserved.

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    Copyright this document and parts thereof must not be reproduced or copied without written permission from abb, and the contents thereof must not be imparted to a third party, nor used for any unauthorized purpose. Trademarks abb and relion are registered trademarks of abb group. All other brand or ...

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    Disclaimer the data, examples and diagrams in this manual are included solely for the concept or product description and are not to be deemed as a statement of guaranteed properties. All persons responsible for applying the equipment addressed in this manual must satisfy themselves that each intende...

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    Conformity this product complies with the directive of the council of the european communities on the approximation of the laws of the member states relating to electromagnetic compatibility (emc directive 2004/108/ec) and concerning electrical equipment for use within specified voltage limits (low-...

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    Table of contents section 1 introduction..........................................................................11 introduction to the operator’s manual.....................................................11 about the complete set of manuals for an ied..................................11 about the...

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    Section 6 read measured values.......................................................29 overview.................................................................................................29 view analog primary values....................................................................30 overvie...

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    Timesynch....................................................................................40 timesynchbin..............................................................................40 timesynchdstbegin...................................................................40 timesynchdstend............

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    Metering.............................................................................................51 overview.......................................................................................51 pulse counter logic pcggio........................................................52 function for ...

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    Broken conductor check brcptoc (46).....................................56 directional over-power protection goppdop (32)......................57 directional under-power protection guppdup (37)....................57 instantaneous phase overcurrent protection phpioc (50)..........57 instantaneous res...

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    Current reversal and weak-end infeed logic for phase segregated communication zc1wpsch (85)..............................62 current reversal and weak-end infeed logic for residual overcurrent protection ecrwpsch (85).....................................62 scheme communication logic for residual over...

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    Overview............................................................................................71 binary output module bom..........................................................71 signal matrix for binary outputs smbo........................................71 function test modes................

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    Automatic switch onto fault logic zcvpsof................................76 power swing detection zmrpsb (78)..........................................77 power swing logic zmrpsl.........................................................77 current protection...............................................

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    Current reversal and weak-end infeed logic for phase segregated communication zc1wpsch (85)..............................82 current reversal and weak-end infeed logic for residual overcurrent protection ecrwpsch (85).....................................82 scheme communication logic for residual over...

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    Authorization......................................................................................93 led test ................................................................................................94 line differential test.......................................................................

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    Section 1 introduction about this chapter this chapter is an introduction to the operator’s manual, its purpose and usage. 1.1 introduction to the operator’s manual 1.1.1 about the complete set of manuals for an ied the user’s manual (um) is a complete set of five different manuals: iec09000744-1-en...

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    The technical reference manual (trm) contains application and functionality descriptions and it lists function blocks, logic diagrams, input and output signals, setting parameters and technical data sorted per function. The technical reference manual should be used as a technical reference during th...

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    • the chapter “diagnose ied status” describes the location and use of available diagnostic tools. • the chapter “test the ied” describes the tests applicable to the ied. • the chapter “ control and supervise the bay” describes how to use the single line diagram to open and close primary apparatuses....

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    Documents related to rel670 identity number setting example 2, setting example 1, 400 kv long overhead power line with breaker-and-a-half cb arr. Mho characteristic. 1mrk 506 291-wen setting example 3, 230 kv extremely long overhead power line, double bus, single cb arr. Quadrilaterial characteristi...

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    Section 2 safety information about this chapter this chapter lists warnings and cautions that must be followed when handling the ied. 2.1 warnings do not touch circuitry during operation. Potentially lethal voltages and currents are present. Always connect the ied to protective ground, regardless of...

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    16.

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    Section 3 overview about this chapter this chapter presents a general overview of the operator's manual. 3.1 operator overview the human machine interface (hmi) on the ied provides an ideal mechanism for the day to day operation and even advanced use of the ied. The keypad, lcd and leds on the front...

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    The type of ied, the main function type, its serial number, ordering number and production date are found here. Section 3 1mrk506276-uus b overview 18 operator's manual.

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    Section 4 understand the local human-machine interface about this chapter this chapter describes the display, its keys (buttons) and leds that make up the hmi. How the keys are used to navigate the hmi, how to interpret the graphic information on the lcd and, what the leds indicate is explained in t...

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    Iec06000531 v1 en figure 2: the hmi keypad. Table 1 describes the hmi keys that are used to operate the ied. Table 1: hmi keys on the front of the ied key function iec06000532 v1 en press to close or energize a breaker or disconnector. Iec06000533 v1 en press to open a breaker or disconnector. Iec05...

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    Key function iec05000109 v1 en press to navigate forward between screens and move right in editing mode. Iec05000110 v1 en press to navigate backwards between screens and move left in editing mode. Iec05000111 v1 en press to move up in the single line diagram and in the menu tree. Iec05000112 v1 en ...

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    4.4 lcd 4.4.1 medium the following case sizes can be equipped with the medium size lcd: • 1/2 x 19” • 3/4 x 19” • 1/1 x 19” this is a fully graphical monochrome lcd which measures 4.7 x 3.5 inches. It has 28 lines with up to 40 characters per line. To display the single line diagram, this lcd is req...

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    4.5.3 indication leds the led indication module comprising 15 leds is standard in 670 series. Its main purpose is to present an immediate visual information for protection indications or alarm signals. Alarm indication leds and hardware associated leds are located on the right hand side of the front...

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    4.7 how to navigate 4.7.1 read to read values and access information about the objects being monitored the operator must navigate the menu tree using the arrow keys. The active submenu or value is highlighted. Navigation is as follows: • press the right arrow key to move to the main menu. • press th...

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    By pressing the l/r key until the uppermost of the two leds next to the key lights up, local operator control can be exercised from the hmi. An apparatus is selected using the up and down arrow keys. The active apparatus is highlighted in the display. The open or close commands are issued by pressin...

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    26.

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    Section 5 understand the hmi tree about this chapter this chapter describes the structure of the hmi. The main menu includes submenus such as measurements, events, disturbance report, settings, diagnostics, test and reset. These branch out into a typical tree structure. 5.1 overview the local hmi ha...

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    Main menu sub menu sub-sub menu general settings power system communication analog modules i/o modules hmi impedance protection current protection voltage protection control monitoring metering setting group n differential protection impedance protection current protection voltage protection frequen...

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    Section 6 read measured values about this chapter this chapter describes measurement categories and how to locate them using the hmi. Each measurement category has a section of its own that includes a general description of the type of quantity being measured and the path in the local hmi to the mea...

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    The measurements menu the operator will only see data from the hardware and software installed. 6.2 view analog primary values 6.2.1 overview the analog primary values are analog quantities measured on the primary side of the trm and reflect the actual current or voltage on the primary side of the v...

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    Analog secondary values shows secondary ct currents and vt voltages. These are the actual current and voltage values at the trm inputs. For analog values received from merging units, no analog secondary values are shown. Main menu/measurements/analog secondary values displays up to 24 channels with ...

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    6.5 view monitoring values 6.5.1 service values cvmmxu main menu/measurement/monitoring/servicevalues(mmxu)/svr displays up to three instances of cvmmxu with measured values for s, p, q, pf, u, i, ilead, ilag and f. 6.5.2 current phasors cmmxu main menu/measurement/monitoring/currentphasors(mmxu)/cp...

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    The voltage sequence component displays the positive (v1), negative (v2) and zero (v0) sequence components in the system, and includes the magnitude and phase angle of each component. 6.6 view metering values 6.6.1 pulse counter logic pcggio main menu/measurements/metering/pulsecounter(pcggio)/pc th...

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    Section 7 event list about this chapter this chapter describes how to find and read the event list. 7.1 view events 7.1.1 overview events displays recorded events such as trips and breaker opened or closed. Main menu/events displays a list of events in chronological order and where each event has a ...

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    Section 8 handle disturbances about this chapter this chapter describes disturbance detection and handling. This includes resetting led alarms, triggering disturbance reports, fault distance calculation and the viewing of several fault indicators. 8.1 identify a disturbance a disturbance record can ...

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    8.2.3 view event recordings the event recording section in the disturbance report shows the recording number. The path in the hmi is shown below. Main menu/disturbance records/record xx/event recording 8.2.4 view trip values in the trip values section of a disturbance recording both the pre-fault an...

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    Section 9 read and change settings about this chapter this chapter describes how to find and change settings and parameters. The chapter is divided into two sections which match the way the two categories of settings are divided up in the hmi. The general settings group consists of those parameters ...

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    9.1.2.2 timesynch main menu/settings/time/synchronization/timesynch here the parameters finesyncsource, coursesyncsrc and syncmaster are switched on or off. 9.1.2.3 timesynchbin main menu/settings/time/synchronization/timesynchbin binary input synchronization settings available here are the position...

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    9.2 general settings setting group 1 must be selected before making any changes to the parameters in general settings menu. Parameters under general settings that are changed will cause the ied to restart. This occurs automatically and requires no manual intervention. The ied must be in setting grou...

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    9.2.2.2 remote communication main menu/settings/general settings/communication/ldcm configuration/ ldcm displays settings for remote binary communication (crb) and for remote multi communication (crm). The multi communication block can send both binary and analog data whereas the binary can only sen...

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    Main menu/settings/general settings/communication/slm configuration/rear optical lon port/spa settings for spa over lon are made here. The operation setting is used to switch the function on or off and the slave address setting is where the slave address is entered. Main menu/settings/general settin...

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    Includes available instances of goose binary receive (gb) where setting operation can be set on or off . Iec61850–8–1 main menu/settings/general settings/communication/station communication/ iec61850–8–1 includes settings for the ied name, operation (on/off) and goose. Multicommand send main menu/se...

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    Main menu/settings/general settings/communication/ethernet configuration/ rear oem-port ab the ip address, ip mask and mode for the iec 61850-8-1 communication using the optical ethernet module (oem) at the rear of the ied are set here. Main menu/settings/general settings/communication/ethernet conf...

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    Parameters where the type of channel is set, the primary and secondary values from vts and cts and for current transformers the wye point location (line side or busbar side) is set. Main menu/settings/general settings/analog modules/mergingunit displays parameters for the merging units. For the mu c...

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    9.2.4 hmi 9.2.4.1 overview under hmi in general settings there are submenus for leds, screen, functions, reference channel service values and the change lock function. In the led submenu there are settings for operation, illumination times, and sequence types for the leds on the ied front panel. In ...

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    9.2.5 control 9.2.5.1 apparatus control overview under control in general settings, parameters for apparatus control can be adjusted. These are the parameters for among others bay control, switch controller, reservation input, circuit breakers and circuit switches. The parameters include delay times...

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    Displays available instances of the local/remote function localremote, locremcontrol that permit the user to set the control mode. Reservation input resin main menu/settings/general settings/control/apparatus control/ reservationinput/re displays available instances of the reservation input function...

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    9.2.6 monitoring 9.2.6.1 overview under monitoring there are parameters for setting service values, current phasors, voltage phasors, disturbance reports, fault locator and the measured value expander block. 9.2.6.2 service values cvmmxu main menu/settings/general settings/monitoring/servicevalues(m...

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    9.2.6.5 generic measured value mvggio main menu/settings/general settings/monitoring/genericmeasuredvalue(ggio)/ mv displays available instances of settings for the measured value function mvggio with a number of settable parameters. These settings are used to define the range of values used in the ...

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    9.2.7.2 pulse counter logic pcggio main menu/settings/general settings/metering/pulsecounter(pcggio)/pc in the pulse counter pcggio folder there are a number of instances of the pulse counter function pcggio. Each instance has a setting and some settable parameters. The setting operation is used to ...

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    Displays available instances of hzpdif (87x) with settings for operation, the alarm voltage level [v] on the ct secondary side, the time delay to activate the alarm, the operating voltage level [v] on the secondary side of the ct and the value of the series resistor in [Ω]. 9.3.3 impedance protectio...

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    Displays available adjustable parameters. These include the ohm per phase for resistive and reactive reach as well as the ohm per loop for phase to phase, and phase to ground fault resistance. Zones can also be set on or off. 9.3.3.5 fullscheme distance protection, quadrilateral for earth faults zmm...

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    Includes settings for base current, voltage and impedance direction angles. 9.3.3.10 directional impedance element for mho characteristics zdmrdir (21d) main menu/settings/setting group n/impedance protection/directional impedance/zdm includes settings for base current, voltage and impedance directi...

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    Measurement mode, impedance settings and other pole slip protection parameters are found here. 9.3.3.16 power swing detection zmrpsb (78) main menu/settings/setting group n/impedance protection/ powerswingdetection(rpsb,78))/psd includes settings for operation, reactive and resistive boundaries, var...

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    Includes current and timer settings. 9.3.4.4 directional over-power protection goppdop (32) main menu/settings/setting group n/current protection/ diroverpowerprotection(pdop,32)/gop includes power, angle and calibration factor settings. 9.3.4.5 directional under-power protection guppdup (37) main m...

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    9.3.4.9 pole discrepancy protection ccrpld (52pd) main menu/settings/setting group n/current protection/polediscordance(rpld, 52pd)/pd displays instances of ccrpld (52pd) with some settings per instance. The settings are for operation, base current, trip time delay, contact function selection, curre...

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    9.3.5 voltage protection 9.3.5.1 overview for voltage protection there are settings for under-voltage, over-voltage, residual over- voltage and overexcitation protection. There are three instances of parameters in each category except in the case of overexcitation which has two instances. Each insta...

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    9.3.5.6 two step undervoltage protection uv2ptuv (27) main menu/settings/setting group n/voltage protection/ undervoltage2step(ptuv,27)/tuv displays available settable parameters. The operation mode, the operate voltage as percentage of ubasevbase are examples of the settings available here. 9.3.5.7...

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    9.3.6.4 underfrequency protection saptuf (81) main menu/settings/setting group n/frequency protection/ underfrequency(ptuf,81)/tuf displays available instances of saptuf (81) with a number of settings per instance. These include parameters like operation, base voltage, and pickup frequency. To ensur...

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    Displays available settable parameters which include scheme type, coordination time for blocking coordination scheme, minimum duration of a carrier send signal and security timer for loss of carrier guard detection. 9.3.8.3 phase segregated scheme communication logic for distance protection zc1ppsch...

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    9.3.8.8 local acceleration logic zclcplal main menu/settings/setting group n/scheme communication/local accelerationlogic(plal)/zclc displays available settable parameters for setting operationon or off , setting time delays, enable and disable various functions. 9.3.9 secondary system supervision 9...

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    Circuit breakers. The autorecloser settings include the number of shots, first shot combinations and many other useful settings. 9.3.10.2 autorecloser smbrrec (79) main menu/settings/setting group n/control/autorecloser(rrec,79)/ar displays available instances of the autorecloser function smbrrec (7...

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    9.3.12 logic 9.3.12.1 overview under logic there are settings for trip logic, trip matrix, logic gate, logic sr memory and logic timer set. Under each of these function categories there are a number of instances, each with a parameter set. 9.3.12.2 tripping logic smpptrc (94) main menu/settings/sett...

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    9.4 activate setting group main menu/settings/activate setting group available setting groups can be configured in pcm600. Under activate setting group one of these setting groups can be chosen for the application at hand. 9.5 language under the language part of the main menu the language options av...

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    Section 10 diagnose ied status about this chapter this chapter describes where in the hmi tree to find the cause of an internal ied failure and information about the ied as such. 10.1 read internal events main menu/diagnostics/internal events internal events in the diagnostics menu of the hmi tree s...

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    Main menu/diagnostics/ied status/merging units/mergingunit:x the list includes all the status signals of each merging unit. Main menu/ diagnostics/communication/front port displays various communication status signals for front port communication. Main menu/ diagnostics/communication/rear oem - port...

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    Section 11 test the ied about this chapter this chapter describes the tests that can be performed in the test section of the hmi. 11.1 overview the test part of the tree view in the hmi has a number of submenus for test and viewing activities. When ied test mode is set to on functions are inactivate...

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    9. Control displays the synchronism-checkautorecloser, and apparatus control functions. The synchronism-checkand the autorecloser functions include a number of function related measurements such as calculated differences of measurements and number and kind of reclosing attempts. Apparatus control in...

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    11.3.1.1 binary input module bim main menu/test/binary input values/binary input modules displays available binary input modules with several binary values per module. 11.3.1.2 signal matrix for binary input smbi main menu/test/binary input values/smt binary inputs/instance:x displays available inst...

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    11.5.2 differential protection main menu/test/function test modes/differential protection test of the high impedance restricted ground fault protection. 11.5.3 impedance protection main menu/test/function test mode/impedance protection test of switch onto fault logic, distance protection zones one t...

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    Test of scheme communication logic, for residual overcurrent protection and distance protection, as well as current reversal and weak end infeed logic, for distance protection and residual overcurrent protection. 11.5.9 secondary system protection main menu/test/function test modes/secondary system ...

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    11.6.2 differential protection 11.6.2.1 high impedance differential protection hzpdif (87) main menu/test/function status/differential protection/ highimpdifferential(pdif,87)/hzd displays available instances of hzpdif (87) with some measurements per instance. These are the trip signal, the alarm si...

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    Displays instances of zmcpdis (21). Main menu/test/function status/impedance protection/distancezones(pdis,21)/ zmc displays instances of zmcapdis (21). 11.6.3.4 fullscheme distance protection, quadrilateral for earth faults zmmpdis, zmmapdis (21) main menu/test/function status/impedance protection/...

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    11.6.3.8 directional impedance zdrdir (21d) main menu/test/function status/impedance protection/ directionalimpedance(rdir)/zd displays one instance of zdrdir (21d) showing one measurement indicating the status of pickup signals. 11.6.3.9 directional impedance element for mho characteristic zdmrdir ...

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    11.6.3.14 power swing detection zmrpsb (78) main menu/test/function status/impedance protection/ powerswingdetection(rpsb,78)/psd1 displays one instance of zmrpsb (78) with three measurements. These indicate a power swing and show the measured impedances for the inner and outer impedance boundaries....

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    11.6.4.4 directional under-power protection guppdup (37) main menu/test/function status/current protection/ dirunderpowerprotection(pdup,37)/gup displays the output data of guppdup (37). 11.6.4.5 instantaneous phase overcurrent protection phpioc (50) main menu/test/function status/current protection...

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    Displays available instances of ef4ptoc (51n,67n) with a number of measurements per instance. The measurements indicate trip and pickup signal status as well as the 2nd harmonic block signal status. 11.6.4.10 sensitive directional residual over current and power protection sdepsde (67n) main menu/te...

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    Displays available instances of oexpvph (24) with a number of measurements per instance. These measurements indicate whether values are out of the measuring range (error) and if the overexcitation function has caused a trip (trip). The thermal status as a percentage of the trip level and the calcula...

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    Displays available instances of saptof (81) with some measurements per instance consisting of trip and pickup signal status. The pickup duration as percentage of the total trip time and a blocking indication as a result of low voltage. 11.6.6.2 rate-of-change frequency protection sapfrc (81) main me...

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    11.6.8 scheme communication scheme communication functions which are used in conjunction with distance protection generate viewable data about the signals used in these applications. Depending on the options chosen, data about weak end infeed, ground faults etc. Is sent to and from ieds. 11.6.8.1 sc...

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    Displays one instance of ecrwpsch (85) with four measurements per instance. 11.6.8.6 scheme communication logic for residual overcurrent protection ecpsch (85) main menu/test/function status/scheme communication/ efschemecommunication(psch,85)/efc displays available instances of ecpsch (85) with som...

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    Displays available instances of the function with an open and a close parameter for each disconnection device. The enable open (en_open) parameter will have the output value one if an open operation is allowed and a zero output if an open operation is not allowed. The conditions for an open operatio...

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    Interlock, one and a half circuit breaker-and-a-half line a main menu/test/function status/control/apparatus control/interl11½cblinea/ il displays available measurements per breaker arrangement (instances of il). The measurements show the states of the various disconnectors, breakers and grounding s...

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    Displays available instances of the function if with several boolean outputs per instance. These indicate for which disconnect devices closing and switching of is allowed and also indicate the status and validity of devices. For example, the measurement named 1289optr indicates whether or not 189 an...

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    Counter (cnt_val), the latest value of the error indication during command (l_cause) and error indication during command (cause) which have integer outputs, the measurement outputs have boolean values indicating the status of processes and devices. Bay reserve qcrsv main menu/test/function status/co...

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    11.6.10.3 commands in the commands menu it is possible to view three sets of values. These are found under the submenus menucascade/uicontrol. Automation bits, command function for dnp3.0 automationbits main menu/test/function status/control/commands/automation bits/abi displays the output data of t...

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    Displays available instances of sesrsyn (25) with a number of measurements per instance. These include information about which lines and buses selected, various voltage and frequency differences and feedback on synchronization status. 11.6.11 monitoring monitoring includes large amounts of viewable ...

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    Main menu/test/function status/monitoring/genericmeasuredvalue(ggio)/mv displays the analog output from the mvggio block. The value shown here depends on the settings and the logical configuration of the preprocessing blocks. The measurement displayed may be current, voltage, frequency, phase angle ...

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    11.6.12 logic under the logic function folder there is viewable data for trip logic (showing number of poles that have tripped and trip signal information), event counter values, logic gate outputs, logic sr memory output states and logic timer set output states are also shown here. 11.6.12.1 boolea...

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    Displays available instances of the gate output. The output data type is an integer with a possible value from 0 to 255. 11.6.12.6 logic sr/rs memory main memory/test/function status/logic/logicsrmemory/sm displays available instances of the function sm. The output data presented in the hmi is boole...

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    The multicommand send indication is used to display data from the local optical network (lon). Multicommand receive main menu/test/function status/communication/station communication/ multiplecommandreceive/cm the multicommand receive indications displayed here show available sets of output data. Ea...

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    11.7 led test main menu/test/led test the test leds menu enables the operator to activate leds manually. Leds that do not light up are defective. Defective leds are also logged in disturbance records under monitoring. 11.8 line differential test main menu/test/line differential test/linedifflogic se...

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    Section 12 control and supervise the bay about this chapter this chapter describes the various control and supervision functions available in the hmi. In particular, how the single line diagram available on the display can be used for this purpose. It also describes the selector switch function avai...

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    12.1.2 locating and using the single line diagram it is possible to navigate the sld screen using the up and down keys on the ied keypad. The apparatus under control is highlighted as the user moves from symbol to symbol using the keypad. An apparatus is opened using the key and closed using the gre...

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    Symbol description xx05000238.Vsd iec05000238 v1 en disconnector xx05000240.Vsd iec05000240 v1 en junction xx05000241_ansi.Vsd mot ansi05000241 v1 en motor xx05000242_ansi.Vsd ansi05000242 v1 en reactor xx05000243_ansi.Vsd ansi05000243 v1 en surge arrestor xx05000244_ansi.Vsd ansi05000244 v1 en traf...

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    98.

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    Section 13 reset about this chapter this chapter describes how to reset the ied and when this is necessary. 13.1 reset guide 13.1.1 reset counters 13.1.1.1 reset autorecloser smbrrec (79) the recorded number of reclosings are reset under reset counters in the hmi tree. Main menu/reset/reset counters...

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    13.1.1.5 reset pulse counter pcggio the pulse counter is reset under reset counters menu in the hmi tree. Main menu/reset/reset counters/pulsecounter(ggio)/pc in the dialog box that appears, choose yes to reset. 13.1.1.6 ldcm clear counters main menu/reset/reset counters/ldcmcommunication/ldcmx acti...

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    13.1.3.2 all indication leds activating the reset of indication leds will zero all fifteen leds to the right of the lcd. Main mnenu/reset/reset leds/all indication leds in the dialog box that appears, choose yes to reset. 13.1.4 reset lockout smpptrc (94) objects that are considered at risk after a ...

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    102.

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    Section 14 authorization about this chapter this chapter describes password procedures and levels of access in the system. 14.1 overview to safeguard the interests of our customers, both the ied and the tools that are accessing the ied are protected, subject of authorization handling. The concept of...

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    Main menu/authorization 14.3 authorization handling in the ied at delivery the default user is the superuser. No log on is required to operate the ied until a user has been created with the user management tool. If there is no user created, an attempt to log on will display a message box: “no user d...

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    Section 15 glossary about this chapter this chapter contains a glossary with terms, acronyms and abbreviations used in abb technical documentation. Ac alternating current act application configuration tool within pcm600 a/d converter analog to digital converter adbs amplitude dead-band supervision a...

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    Comtrade standard common format for transient data exchange format for disturbance recorder according to ieee/ansi c37.111, 1999 / iec60255-24 contra-directional way of transmitting g.703 over a balanced line. Involves four twisted pairs of with two are used for transmitting data in both directions,...

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    Esd electrostatic discharge fox 20 modular 20 channel telecommunication system for speech, data and protection signals fox 512/515 access multiplexer fox 6plus compact, time-division multiplexer for the transmission of up to seven duplex channels of digital data over optical fibers g.703 electrical ...

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    Specifications from the pci sig (special interest group) for the electrical emf electro motive force. Ied intelligent electronic device i-gis intelligent gas insulated switchgear instance when several occurrences of the same function are available in the ied they are referred to as instances of that...

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    Ncc national control centre oco cycle open-close-open cycle ocp overcurrent protection oltc on load tap changer ov over voltage overreach a term used to describe how the relay behaves during a fault condition. For example a distance relay is over-reaching when the impedance presented to it is smalle...

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    Rtc real time clock rtu remote terminal unit sa substation automation sc switch or push-button to close scs station control system sct system configuration tool according to standard iec 61850 sma connector subminiature version a, a threaded connector with constant impedance. Smt signal matrix tool ...

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    Underreach a term used to describe how the relay behaves during a fault condition. For example a distance relay is under-reaching when the impedance presented to it is greater than the apparent impedance to the fault applied to the balance point, i.E. The set reach. The relay does not “see” the faul...

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    Contact us abb inc. 940 main campus drive raleigh, nc 27606, usa phone toll free: 1-800-help-365, menu option #8 abb inc. 3450 harvester road burlington, on l7n 3w5, canada phone toll free: 1-800-help-365, menu option #8 abb mexico s.A. De c.V. Paseo de las americas no. 31 lomas verdes 3a secc. 5312...