User Manual
Contents
1. Normal Inverse 1 3110 Us 10 0 1 0 01 0 05 10 20 M gt Very Inverse ts 10 1 k 1 0 0 8 0 6 0 5 0 4 0 3 0 2 0 1 0 1 0 05 0 01 1 10 20 MI gt Long time Inverse Us 200 100 10 k 1 0 08 0 6 0 5 0 4 0 3 0 2 1 0 1 0 05 0 1 1 10 20 MI gt Extremely Inverse Us 0 1 0 012. very inverse curve extremely inverse curve and definite time The high set units are the definite time type instantaneous tripping is made possible by setting the time to minimum The MK1000A incorporates a 4 digit LED indicator which allows direct numerical readout of set values actual measured value recorded value and system indication All current measurements and current settings are based on 5A current transformer CT 2 Light indication The indicators display the status of the system as follow FUNCTION DATA Status o o o o0 0 No Auxiliary power supply 1 o o x x Normalcondiion notripping lt JUR UN time delay countdown started time delay countdown started 1 Low set tripped Function LED indicates tripping source Data LED shows tripped value 1 High set tripped Function LED indicates tripping source Data LED shows tripped value 1 Peoro i Table 1 System Status 1 ON 0 OFF blinking X don t care not blinking Indicator FUNCTION pP DATA Earth fault current L1 load current L2 load current L3 load current ff ff 2 3 2 3 Toff overcurentiow set curent sening Table 2 Function Codes 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 automatic
3. POETE S VAC id O C Normal Inverse curve 1 3 10 P 0 Long dime Inverse Expected electrical life 10 operations O C Very Inverse curve O C Extremely Inverse curve Expected mechanical life 5 x106 operations OIC Definite time Indicators E F Normal Inverse curve 3 10 Auxili G LED indicat EI Norna vene eune 1970 et roa Hang ume enero 7 segment LED and red E F Very inverse curve LED indicators E F Extremely inverse curve Mechanical E F Definite time Mounting Panel mounting Front panel Standard DIN 96x96 Table 3 Soft switches setting E F Earth fault O C Overcurrent 7 Case Dimension Approximate weight P 110mm 96 mm 100 a4 90mm e E E E Front Panel Cutout E a OO Figure 5 Case dimension 8 Connection Diagram L1 L2 L3 N 9 Time current Characteristic Normal Inverse 3110 Us 0 1 0 1 20 10 05 I gt
4. blinks Relay is in simultaneously programming mode switch 1 setting function iii Press Up key to alter the setting until desired value display iV Press Up amp Down keys simultaneously to save new value and exit programming mode Function LED stop blinking Switch value SVL shows the new setting i e 13 Switch value SVL changed to 13 refer table 3 for soft switch configuration Example 3 To change overcurrent low set IDMT characteristic from normal inverse 3 10 curve to 6 Technical Data long time inverse curve Ratings Expected Output Display Rated current n i Press Reset key until soft Function LED shows me Frequency 50 or 60 Hz Switch 4 setting function Switch number SW shows 4 2 Switch value E LHL B urd r 0 3 VA at ii Press Up amp Down keys Function LED blinks Relay is Auxiliary Supply simultaneously in programming mode 1 Press Up key to alter the Switch value SVL ch d Supply voltage y witch value change setting until desired value to 02 refer table 3 for soft MK1000A 240A 6 198 265 VAC switch configuration iV Press Up amp Down keys Function LED stop blinking System configuration R1 auto reset type linked to O C R1 auto reset type linked to E F MK1000A 240AD 6 100 240 VAC 110 370 VD
5. the setting until desired value display i e 6 00 iv Press Up amp Down keys simultaneously tosave new value and exit Function LED shows 4 Data LED shows default setting is 5 00A Function LED blinks Relay rei 7j in programming mode AL Data LED shows set value increasing until it shows 6 00 Function LED stop blinking DATA LED displays the new setting i e 6 00 programming mode 4 Output Contacts The MK1000A has two relay outputs R1 and R2 The output contacts can be programmed as follow linked to overcurrent trip signal linked to earth fault trip signal manual reset or auto reset type For auto reset type the contact remains activated until the fault current is removed For manual reset type the contact remains activated even with the removal of fault current This contact can only be reset by pressing the RESET key 5 Soft Switches The MK1000A incorporates 5 soft switches for system configuration When the Function LED shows the relay is in soft switch setting mode COOC L LI LI LI p Switch value SVL switch number SW Figure 2 Soft switch indication Example 2 To change contact R1 linked to overcurrent amp earth fault from auto reset to manual reset men i Press Reset key until soft Function LED shows Switch number SW shows 1 Switch value SVL shows 03 ii Press Up amp Down keys Function LED
6. C simulta eously to savenew Switch salve ave shows MK1000A 150D 24 150 VDC Supply frequency 50 Hz or 60 Hz VA rating 3 VA typical Setting Ranges i Overcurrent elements R1 auto reset type linked to O C amp E F Low set setting I 0 50 10 00 A 10 200 Low set time multiplier kt 0 05 1 00 YER i Low set definite time t 0 05 99s R1 manual reset type linked to E F High set setting I gt gt 0 50 99 9 A 10 1998 R1 manual reset type linked to O C amp E F R2 auto reset type linked to O C R2 auto reset type linked to E F R2 auto reset type linked to O C amp E F R2 manual reset type linked to O C R2 manual reset type linked to E F R2 manual reset type linked to O C amp E F E F high set disabled O C high set disabled E F high set disabled O C high set enabled High set definite time t 0 05 2 5s ii Earth fault elements Low set setting lo gt 0 10 5 00 A 2 100 Low set time multiplier kto 0 05 1 00 Low set definite time to 0 05 99 s High set setting l5 0 10 50 0 A 2 100096 High set definite time t gt gt 0 05 2 5s Outputs E F high set enabled O C high set disabled E F high set enabled O C high set enabled Trip Contacts R1 amp R2 O C Normal Inverse curve 3 10 d voltage
7. MK1000A Combined Overcurrent amp Earth Fault Relay User s Guide A BRIEF OVERVIEW d e f MK 1000A Symbols lLa Earth fault current a Auxiliary power supply lL1 L1 current indicator lL2 12 current b Low set start trip status indicator 103 L3 current c High set start trip status indicator Overcurrent low set d Downkey kt Overcurrent time multiplier time e Upkey delay f Resetkey l gt gt Overcurrent high set g TestKey t Overcurrent high set delay time h DPLED indicator lo Earth fault low set ktog Earth fault time multiplier time i FUNCTION LED indicator j DATALED indicator delay lo Earth fault high set to Earth fault high set delay time Sw Soft switches 1 General Description The MK1000A combined overcurrent and earth fault relay is a microprocessor based numerical relay It uses fundamental frequency current measurement for excellent harmonic current rejection The relay provides three independent phase overcurrent elements and one non directional earth fault element All these elements are connected to the current transformers of the feeder to be protected The overcurrent and the earth fault elements consist of independent low set units and high set units The time current characteristic of the low set units are selectable between inverse definite minimum time IDMT normal inverse curve 3 10 normal inverse curve 1 3 10 long time inverse curve
8. ally after 6 minutes if no further key is pressed 3 Push buttons Operation a Trip Test Press the TEST button to simulate a trip condition 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 The sequence of selection is as follow Figure 1 Scroll sequence 88 Programable items d Programming Setting To program the setting for I kt I gt gt t gt gt lo kto gt lo gt gt to gt gt soft SW1 soft SW2 soft SW3 soft SW4 and soft SW5 Step1 Press RESET key until the Function LED shows the required function Step2 Press the UP and DOWN key simultaneously to enter programming mode The Function LED blinks to indicates the relay is in programming mode Step3 Use the UP or DOWN key to select the desired value Step4 To save the selected value press the UP and DOWN key simultaneously again It will exit the programming mode with the Data LED displaying the newly set value To exit programming mode without saving the selected setting press the RESET key once Example 1 To set overcurrent low set setting from 5A 100 to 6A 12096 Expected Output Display i Press Reset key until overcurrent low set setting function i e Function 4 ii Press Up amp Down keys simultaneously iii Press Up key to alter
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