SIPROTEC 4 7SA522 Distance Protection Relay for Transmission ...

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Appendix Explanation of ANSI numbers, IEC designation ANSI IEC ANSI standard 7SA522 number 59 U>>, U> Overvoltage relay. A relay that operates when its input voltage is more than a predetermined value. Phase-ground and zero sequence overvoltage 62 Time-delay stopping or opening relay. A time-delay relay that serves in conjunction with the dvice that initiates the shutdown, stopping or opening operation in an automatic sequence or protective relay system. 64 U T > Ground detector relay. A relay that operates upon failure of machine or other apparatus insulation to ground. 66 Notching or jogging device. A device that functions to allow that only a specified number of operations of a given device or equipment, or a specified number of successive operations within a given time of each other. It is also a device that functions to energize a circuit periodically or for fractions of specified time intervals, or that is used to permit intermittent acceleration or jogging of a machine at low speeds for mechanical positioning. 67 AC directional overcurrent relay. A relay that functions on a desired value of ac overcurrent flowing in a predetermined direction Application of programmable logic Ground fault detection 67 N Directional ground-fault time overcurrent 68 Blocking relay is a relay that initiates a pilot signal for blocking or tripping on external faults in a transmission line or in other apparatus under predetermined conditions, or cooperates with other devices to block tripping or to block reclosing on an out-of-step condition or on power swings Power swing blocking 68 T Power swing tripping 74 74 TC Alarm relay. A relay other than an annunciator, as covered under device function 30, that is used to operate, or that operates in connection with, a visual or audible alarm. Trip circuit supervision 79 AC reclosing relay. A relay that controls the automatic reclosing and locking out of an ac circuit interrupter. Auto reclosing function 81 Frequency relay. A relay that responds to frequency of an electrical quantity, operating when the frequency or rate of change of frequency exceeds or is less than a predetermined value. 85 85-21 Teleprotection Carrier or pilot-wire receiver relay is a relay that is operated or restrained by a signal used in connection with carrier-current or dc pilot-wire fault directional relaying. – Application of programmable logic: Operating measured value and limit value module Pilot schemes for distance protection 85-67N 86 Lockout relay. A hand or electrically reset auxiliary relay that is operated upon the occurence of abnormal conditions to maintain associated equipment or devices inoperative until it is reset 87 Differential protective relay. A protective relay that functions on a percentage, phase angle, or other quantitive difference between two currents or some other electrical quantities. Pilot schemes for directional ground fault protection Trip signal lock-out see product range 7SD or 7UT 46 Siemens SIP 4.2 · 08/99
List of abbreviations used A, B, C Phase designation according to ANSI AMZ curves Inverse time overcurrent protection IDMT characteristics ANSI American National Standard Institute AR Auto-reclosure ARC Auto-reclosure BI Binary Input BO Binary Output CFC Continuous Function Chart DCF77 Time synchronizing signal in Germany DO Digital Output EF Earth Fault detection Flash-EPROM Electrically Programmable and Erasable Memory FO Fiber Optic Conductor GPS Global Position System IBS Commissioning IEC International Electrotechnical Commission IRIG B Time synchronizing signal via GPS L1, L2, L3 Phase designation according to IEC LED Light Emitting Diode MHO Circle characteristic in the impedance plane NC Normally Closed output relay contact, e.g. contacts are closed if relay is not activated NO Normally Open output relay contact, e.g. contacts are open if relay is not activated OLM Optical Link Module PLC Programmable Logic Control PLC Power Line Carrier R Relay SC Substation Controller SCADA Supervisory Control and Data Aquisition SICAM Substation Information Control Automation and Monitoring System SIMATIC SIEMENS Automation Technology SIPROTEC SIEMENS PROTECTION SIR Source to line impedance ratio Ratio of the source impedance behind a relay terminal to the line impedance. UMZ curves Definite time overcurrent protection DT characteristics Siemens SIP 4.2 · 08/99 47
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