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MK231A Earth-fault Relay User's Guide
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1. DESCRIPTION
The MK231A is a microprocessor based numerical earth-fault relay. It uses fundamental frequency
current measurement for excellent harmonic current rejection. The relay provides two- element (low-set
and high-set) earth-fault protection with definite time characteristic.
MK231A allows the display of present load current; recorded fault current for last tripping; and all
setting of the relay.
The 4-digit panel display on the
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Summary of Contents for Mikro MK231A
- Page 1 The relay provides two- element (low-set and high-set) earth-fault protection with definite time characteristic. The 4-digit panel display on the MK231A allows the display of present load current; recorded fault current for last tripping; and all setting of the relay.
- Page 2 RESET key once. Programming mode. 4. OUTPUT CONTACTS Table 1: System Status The MK231A has two set of output contact: 1 = ON = OFF X= don’t care, not blinking B = blinking DT = DATA FUNC = FUNCTION (i) CONTACT R1 - linked to trip signal.
- Page 3 Pick up ........Red LED indicator Burden ........< 0.3 VA at I Trip ........7 segment LED and red LED indicators Auxiliary Supply MK231A-240A(6).....198~265 VAC Mechanical MK231A-110A(6).....94~127 VAC Supply frequency ....50 Hz or 60 Hz Mounting ......Panel mounting Front panel ......Standard DIN 96x96 mm VA rating .........3 VA typical...
- Page 4 8. CASE DIMENSION 9 6 mm Fr o n t 110mm 100mm 90mm Figure 2: Case Dimension...
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