Multiple main protection elements and simplified application

The MiCOMho P446, P443 and P445 relays operate with advanced load blinding and disturbance detection techniques, such as power swing blocking, to ensure stability when no tripping is required.

Whether protection is required for lines, cables or hybrids of grounded transmission and distribution circuits, the MiCOMho P446, P443 and P445 relays’ characteristics allow for versatile deployment.

Each relay model contains multiple main protection elements: Distance, delta directional comparison protection, and directional earth/ground fault unit protection (DEF). This permits simplified application and spares holding, because the MiCOMho can be adopted as the standard protection platform.  

Breaker control and monitoring application

The MiCOMho P446 is suitable for the complex installations where feeders are controlled by two circuit breakers such as ring bus/mesh corner formations and the breaker-and-a-half configurations. 

The MiCOMho P443 and P445 are suitable for feeders controlled by single circuit breaker.

• The logic capability of the MiCOMho products are extremely versatile, for instance managing leader-follower auto-reclosing and check synch schemes in case of dual breaker applications.
• 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.

Reduced setting requirements, integral teleprotection

• P446 and P443:Sub-cycle fault clearance from 0.7 to 1 cycle.
• Simple set mode: The relay determines its own settings from protected line data.
• Power swing blocking without the need for setting  
• Integral teleprotection via a MODEM, fiber or MUX channel.

Associated Training Courses

	MiCOM P443 HV & EHV Distance Relay
	MiCOM Px40 Master Class
	MiCOM Px20 & Px40 Master Class
	MiCOM Px20 Px30 Px40 Master Class
	All training courses