MiCOM P541 - P546 Range

The MiCOM P541-P546 series provides high-speed current differential unit protection. The P54x is designed for all overhead line and cable applications, as it interfaces readily with the longitudinal (end-end)communications channel between line terminals. The interface options support direct fiber optic, or multiplexed digital links.

Optimum selectivity is assured, as the scheme measures the currents entering and leaving the protected plant item. Instantaneous tripping results for an internal fault, with stability for any out-of-zone fault. Tripping uses a proven characteristic comparing differential current with through current, for ease of testing. Phase differential elements of this type offer consistent detection of solid and resistive faults, with optimum faulted phase selection, tripping, and indication.

A full range of back-up protection is integrated. This enhances the dependability of the protection, as hot-standby elements (such as distance zones and overcurrent) can be brought into service whenever a signalling channel outage may occur.

Key Benefits

• Highly selective unit protection
• Extensive health monitoring for the communications channel
• Integrated back-up elements running hot standby in the event of comms channel outage

MiCOM P543 - P546 Range

The MiCOM P543 to P546 is a range of transmission-class protection relays providing high-speed current differential unit protection. The P54x is designed for all overhead line and cable applications, as it interfaces readily with the longitudinal (end-end) communications channel between line terminals. The interface options support direct fiber optic, or multiplexed digital links.

From design suffix K, a significant step evolution in the range has been introduced. P543 – P546 offer resident subcycle distance protection, to complement the powerful suite of main and backup protection already proven within the family. Full scheme, five zone distance protection is adopted from the class-leading MiCOMho P443.

The P54x becomes the standard in all HV, EHV and UHV line protection applications, duplicated where dual redundant main protection is demanded. Set any combination of differential, distance, overcurrent, and reclosing, depending on the site needs.

One universal relay type instead of two or more discrete models means reduced spares holding, less training, and lower cost.

Breaker control and monitoring application

The MiCOM P544 & P546 is suitable for the complex installation and feeders controlled by two circuit breakers such as the breaker-and-a-half configurations. While MiCOM P543 & P545 are suitable for feeders controlled by single circuit breaker.

Following features for Breaker control and monitoring applications are supported :

• The Auto-reclose and Check synch schemes for single and dual circuit breaker applications ( P544 and P546 models )
• The Auto-reclose and Check synch schemes for single breaker applications ( P543 and P545 models )
• Transmission-class circuit breaker failure protection for one or two breakers. The breaker failure protection may be initiated from internal protection within the relay or from external devices.
• Single pole and three-pole breaker operation is supported, with independent supervision & condition monitoring statistics for each pole
• Trip circuit supervision, control, and interlocking schemes can be designed in graphical support software.

Key Benefits

• High-speed protection of plain and multi-ended circuits, with in-zone transformers or tapped loads
• Subcycle five zone mho and quadrilateral distance protection
• Directional earth fault protection (DEF aided schemes for ground fault high sensitivity)
• Differential current transformer supervision detects any CT or wiring problem that could jeopardize protection integrity
• Full connectivity to direct fiber and multiplexed channels including SONET/SDH rings
• Self-healing distance and differential teleprotection messaging

Associated Training Courses

	MiCOM P520 & P540: Line Differential Protection Relay
	MiCOM P440 & P540 & P630 Relaying
	MiCOM Px40 Master Class
	MiCOM Px20 & Px40 Master Class
	MiCOM Px20 Px30 Px40 Master Class
	All Training Courses