MK231A Earth-fault Relay User`s Guide
Contents
1. 198 265 VAC MK231A 110A 6 94 127 VAC Mechanical Supply frequency 50 Hz or 60 Hz Mounting Panel mounting VA rating 3 VA typical Front panel Standard DIN 96x96 mm Approximate weight 0 6 kg Setting Ranges Low set setting I 0 10 5 00 A 2 100 Low set definite time t gt 0 05 99 sec High set setting gt gt 0 10 50 0 A 2 1000 High set definite time t 0 05 2 5sec Outputs Trip Contact Rated voltage 250 VAC Continuous carry 5A cos 6 1 0 Make and carry for 0 2 s 30A Contact specification Expected electrical life 10 operations Expected mechanical life Re 5 x108 operations 7 CONNECTION DIAGRAMS Earth Fault Relay MK 231A 8 CASE DIMENSION 96 mm m Front 96 mm 90mm m Panel Cutout 90mm Figure 2 Case Dimension2. CTION DP DATA O o of Earth fault current 0 blink Previous tripped current Low set current setting Low set delay time setting 6 of High set current setting High set delay time setting 8 off Soft switch setting Table 2 FUNCTION Code Note Under normal operating condition The 4 digit display is off When the RESET key is pressed the 4 digit display will light up The display will switch off automatically after 6 minutes if no further key is pressed 3 PUSH BUTTONS OPERATION a Trip test Press the TEST button to simulate a trip b Trip reset Press the RESET button to reset the relay when tripped c View setting When the relay is not under tripped condition pressing the RESET button will scroll through the various functions nos Hh LI c i Uu 7 7 70 EL 1 a a B Ta BHg HrE HUgte i Figure 1 Scroll sequence d Program setting Only function codes from 4 to 8 can be programmed Step 1 Press RESET key until the function digit shows required function Step 2 Press the UP and DOWN key simultaneously to enter programming mode The function digit will blinks to indicates the relay is in programming Step 3 Use the UP or DOWN key to select the desired value Step 4 To save the selected value press the UP and DOWN key simultaneously again It will exit the programming mode with the data digits displaying new setting To exit programming mode withou
3. MK231A Earth fault Relay User s Guide A BRIEF OVERVIEW h MK 231A 9 a Auxiliary power supply indicator b Low set start trip status indicator c High set start trip status indicator d Down key e Up key f Reset key g Test key h DP indicator i FUNCTION indicator j DATA indicator 1 DESCRIPTION Symbols lo Earth fault current I Low set t gt Low set delay time gt gt High set t High set delay time SW Soft switches 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 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 2 LIGHT INDICATORS The indicators display the status of the system as follow PEER sm FUNC Status olojo o jo No Auxiliary power supply 1 0 0 f x X Normal condition no tripping ee time delay countdown started 1 1 x X High set overcurrent triggered CTI Pr mani me 1 Low set tripped DT LEDs show tripped value 1 High set tripped DT LEDs show tripped value HERE Programming mode Table 1 System Status 1 0N 0 OFF X don t care not blinking B blinking DT DATA FUNC FUNCTION Indicator FUN
4. t saving the selected setting press the RESET key once 4 OUTPUT CONTACTS The MK231A has two set of output contact i CONTACT R1 linked to trip signal i CONTACT R2 linked to trip or start signal The output contact can be programmed to be either auto reset type or manual reset type For auto reset type the contact remain activated until the fault current is removed For manual reset type the contact remain activated 5 SOFT SWITCHES The MK231A incorporates 3 soft switches for system configuration When the function digit shows 8 the relay is in soft switch setting mode EL LI cl LI LI LI LI H us value SVL switch number SW System configuration 1 00 Contact R1 linked to trip signal auto reset type 01 Contact R1 linked to trip signal manual reset type 2 00 Contact R2 linked to trip signal auto reset type 01 Contact R2 linked to trip signal manual reset type 10 Contact R2 linked to signal auto reset type 11 Contact R2 linked to signal manual reset type 3 00 High set disabled 01 High set enabled Table 3 Soft switch setting 6 TECHNICAL DATA Ratings Indicators Rated current 5 Auxiliary supply Green LED indicator gi jc qe 50 Hz or 60 Hz Pick up sssseenne Red LED indicator Burden ESS lt 0 3 VA at In NM non 7 segment LED and red LED indicators Auxiliary Supply MK231A 240A 6
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