REL561 1MRK002496-AC 线路差动保护端子

REL561

The REL561 line differential protection terminal is the basic unit for sub-transmission and transmission line differential protection applications and forms a part of a
PANORAMA Station Automation. The PANORAMA Station Automation concept includes a complete range of single-function units and multi-functional terminals, Substation Monitoring System (SMS) and Substation Control System (SCS). The units in the PANORAMA concept are available as stand alone relays/terminals or as building blocks in a total power network management system.

• Line differential functionality comprises;
– phase segregated current differential measurement evaluating both magnitude and phase angle
– increased stabilisation through CT saturation detector
– continuous compensation of transmission delay, enabling use of route switched communication networks
– transfer trip within the digital communication channel
– charging current compensation
– master/master design
– interfaces for multiplexed connections, direct fibre or pilot wires
• Line distance functionality comprises;
– simultaneous measurement of the different phase – phase and phase – earth impedances within the numerical measuring elements, individually for each type of fault and each distance zone for fast and reliable fault detection
– three zone protection with completely individual settings
– excellent phase selection
– series compensated networks add-on
– scheme communication logic with current reversal and weak end infeed logics
– power swing detection with additional logic
• Additional protection functionality such as;
– phase overcurrent, residual current and voltage functions
– breaker failure protection
– fuse failure and current transformer circuit supervision
– fast interbay communication of binary signals
– single- or multi-pole tripping
• Control;
– command control
– autoreclosing and synchro-check with phasing and energising check
• Monitoring;
– event recorder
– disturbance recorder
– fault locator
– trip value recorder
– status indication of all input and internal binary signals
– presentation of measured mean values of line current, voltage, active power, reactive power and frequency with accuracy up to 0.25%