MK2200 is housed in an aluminum case suitable for panel mounting.
The transparent polycarbonate front panel cover provides IP54 degree of protection against splashing water besides acting as a sealed cover against tampering or unauthorised changes to the settings of the relay.
Fully digital user interface with large and bright seven-segment LED display, indicators and push button switches give a very user-friendly access to the status, settings and recorded information of the relay.
The relay can have up to 4 current transformer (CT) inputs with the CTs’ ratio of either 5A or 1A. An optically isolated digital input can be programmed as changeover input for protection group settings, remote reset input, blocking input or external tripping input.
Five programmable output contacts can response to relay pick-up and/or relay trip. In addition, a changeover IRF contact is available for monitoring any relay failure. Through the optically isolated RS485 Modbus-RTU serial communication interface, MK2200 can be networked to SCADA system.
MK2200 consists of three independent phase overcurrent elements and one nondirectional earth fault element.
It is intended to be used for phase short circuit protection and earth fault protection of electrical distribution system.
All the overcurrent and earth fault elements in the relay are connected to the electrical distribution feeders to be protected through either 5A CTs or 1A CTs as shown in Chapter 5.
Measurements of the phase currents and earth fault current are done through waveform sampling and numerical technique to extract only the fundamental frequency components thus eliminate the possible erroneous response to protection function as a result of harmonic currents in the electrical distribution system.
