MK1000A Combined Overcurrent 2.L igh t nd ca o & Earth ...

1 MK1000A Combined Overcurrent 2. Light indication & Earth -Fault Relay User's Guide The indicators display the status of the system as follow: A BRIEF OVERVIEW LED Indicator Aux l> l>> FUNCTION DATA Status 0 0 0 0 0 No Auxiliary power supply. 1 0 0 X X Normal condition, no tripping. 1 1 0 X X Low-set triggered, time delay countdown started. 1 0 1 X X High-set triggered, time delay countdown started. a j 1 B 0 B B Low-set tripped, b Function LED indicates tripping source, i Data LED shows tripped value. c 1 0 B B B High-set tripped, h Function LED indicates tripping source Data LED shows tripped value. 1 X X B 1 Programming mode. d e Table 1: System Status f 1 = ON 0 = OFF X= don't care, not blinking g B = blinking Symbols Indicator IL n - Earth -fault current FUNCTION DP DATA. a - Auxiliary power supply IL 1 - L1 current 0 off Earth -fault current. indicator IL 2 - L2 current 1 off L1 load current.

2 B - Low-set start/trip status indicator IL 3 - L3 current 2 off L2 load current. c - High-set start/trip status indicator I> - Overcurrent low-set 3 off L3 load current. d - Down key kt> - Overcurrent time multiplier/ time 0 blink Previous Earth -fault tripped current. delay 1 blink Previous L1 tripped current. e - Up key f - Reset key I>> - Overcurrent high-set 2 blink Previous L2 tripped current. t>> - Overcurrent high-set delay time 3 blink Previous L3 tripped current. g - Test Key I o> - Earth -fault low-set 4 off Overcurrent low-set current setting. h - DP LED indicator kt o> - Earth -fault time multiplier/ time 5 off Overcurrent time multiplier/ delay setting. i - FUNCTION LED indicator delay 6 off Overcurrent high-set current setting. j - DATA LED indicator I o>> - Earth -fault high-set 7 off Overcurrent high-set delay time setting. to>> - Earth -fault high-set delay time 8 off Earth -fault low-set current setting.

3 Sw - Soft switches 9 off Earth -fault time multiplier/ delay setting. A off Earth -fault high-set current setting. 1. General Description b off Earth -fault high-set delay time setting. c off Soft switch setting. The MK1000A Combined Overcurrent and Earth -fault relay is a microprocessor based numerical relay. It uses fundamental Table 2: Function Codes frequency current measurement for excellent harmonic current rejection. The relay provides three independent Note: Under normal operating condition, The 4-digit display is off. When the phase Overcurrent elements and one non-directional Earth - RESET key is pressed, the 4-digit display will light up. The display will fault element. All these elements are connected to the switch off automatically after 6 minutes if no further key is pressed. 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.

4 The time 3. Push-buttons Operation current characteristic of the low-set units are selectable between inverse definite minimum time (IDMT) normal a) Trip Test inverse curve 3/10, normal inverse curve , long time Press the TEST button to simulate a trip condition. inverse curve, very inverse curve, extremely inverse curve and definite time. The high-set units are the definite time b)Trip Reset type, instantaneous tripping is made possible by setting the time to minimum. Press the RESET button to reset the relay when tripped. 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). 1. c) View Setting Example 1: To set Overcurrent low-set setting from 5A(100%) to 6A(120%). When the relay is not under tripped condition, pressing the RESET button will scroll through the various functions.

5 The Display Procedures Expected Output sequence of selection is as follow: (i) Press "Reset" key until Function LED shows "4". Overcurrent low-set setting Data LED shows default function. Function 4. setting is START (ii) Press "Up" & "Down" keys Function LED blinks. Relay is simultaneously. in programming mode. (iii) Press "Up" key to alter the Data LED shows set value I Ln Soft SW5 setting until desired value increasing until it shows display. " ". (iv) Press "Up" & "Down keys Function LED stop blinking, I L1 Soft SW4 simultaneously tosave new DATA LED displays the new value and exit setting. programming mode. I L2 Soft SW3. 4. Output Contacts I L3 Soft SW2. The MK1000A has two relay outputs (R1 and R2). The output I Ln Record Soft SW1 contacts can be programmed as follow: - linked to Overcurrent trip signal. I L1 Record t o>>. - linked to Earth -fault trip signal.

6 - manual reset or auto reset type. I L2 Record I o>>. For auto reset type, the contact remains activated until the fault current is removed. I L3 Record kto>. For manual reset type, the contact remains activated even I> I o> with the removal of fault current. This contact can only be reset by pressing the "RESET" key. kt> t>>. 5. Soft Switches I>>. The MK1000A incorporates 5 soft switches for system configuration. When the Function LED shows c , the relay is Figure 1: Scroll sequence in soft switch setting mode. Programable items d) Programming Setting To program the setting for I>, kt>, I>>, t>>, Io>, kto>, Io>>, to>>, soft SW1, soft SW2, soft SW3, soft SW4 and switch value (SVL). soft SW5. switch number (SW). Step1: Press RESET key until the Function LED shows Figure 2: Soft switch indication the required function. Example 2: To change contact R1(linked to Overcurrent &.

7 Step2: Press the UP and DOWN key simultaneously Earth -fault) from auto reset to manual reset. to enter programming mode. The Function LED blinks to indicates the relay is in Procedures Expected Output Display programming mode. (i) Press "Reset" key until soft Function LED shows "c". switch 1 setting function. Switch number (SW) shows "1". Step3: Switch value (SVL) shows "03". Use the UP or DOWN key to select the desired value. (ii) Press "Up" & "Down" keys Function LED blinks. Relay is in simultaneously. programming mode. (iii) Press "Up" key to alter the Switch value (SVL) changed to setting until desired value "13". (refer table 3 for soft Step4: To save the selected value, press the UP and display. switch configuration). DOWN key simultaneously again. It will exit (iv) Press "Up" & "Down keys Function LED stop blinking, simultaneously to save new Switch value(SVL) shows the the programming mode with the Data LED value and exit new setting.

8 "13". displaying the newly set value. programming mode. To exit programming mode without saving the selected setting, press the RESET key once. 2. Example 3: To change Overcurrent low-set IDMT 6. Technical Data characteristic from normal inverse 3/10 curve to long time inverse curve. Ratings Procedures Expected Output Display Rated current I n ..5 A. (i) Press "Reset" key until soft Function LED shows "c". Frequency ..50 or 60 Hz switch 4 setting function. Switch number (SW) shows "4" Burden ..< VA at I n Switch value (SVL) shows "00". (ii) Press "Up" & "Down" keys Function LED blinks. Relay is Auxiliary Supply simultaneously. in programming mode. (iii) Press "Up" key to alter the Supply voltage Switch value (SVL) changed setting until desired value to "02". (refer table 3 for soft MK1000A -240A(6) ..198~265 VAC. display. i switch configuration) MK1000A -240AD(6) .. 100 ~ 240 VAC.

9 (iv) Press "Up" & "Down keys Function LED stop blinking, 110 ~ 370 VDC. simultaneously to save new Switch value(SVL) shows MK1000A -24D .. 18 ~ 72 VDC. value and exit the new setting. "02". programming mode. Supply frequency ..50 Hz or 60 Hz VA rating ..3 VA typical SW SVL System configuration Setting Ranges 1 01 R1 auto reset type, linked to O/C. (i) Overcurrent elements 02 R1 auto reset type, linked to E/F. 03 R1 auto reset type, linked to O/C & E/F. Low-set setting I>.. - A (10%-200%). 11. Low-set time multiplier kt> .. - R1 manual reset type, linked to O/C. Low-set definite time t> .. - 99 s 12 R1 manual reset type, linked to E/F. High-set setting I>> .. - A (10% - 1998%). 13 R1 manual reset type, linked to O/C & E/F. High-set definite time t>>.. - s 2 01 R2 auto reset type, linked to O/C. 02 R2 auto reset type, linked to E/F. (ii) Earth -fault elements 03 R2 auto reset type, linked to O/C & E/F.

10 Low-set setting I o >.. - A (2% - 100%). 11 R2 manual reset type, linked to O/C. Low-set time multiplier kt o >.. - 12 R2 manual reset type, linked to E/F. Low-set definite time t o >.. - 99 s 13 R2 manual reset type, linked to O/C & E/F. High-set setting Io >>.. A (2% - 1000%). 3 00 E/F high-set disabled; O/C high-set disabled. High-set definite time t>>.. - s 01 E/F high-set disabled; O/C high-set enabled. Outputs 10 E/F high-set enabled; O/C high-set disabled. 11 E/F high-set enabled; O/C high-set enabled. Trip Contacts(R1&R2): 4 00 O/C Normal Inverse curve 3/10. Rated voltage ..250 VAC. 01 O/C Normal Inverse curve Continuous carry ..5A (cos = ). Make and carry for s .. 30A. 02 O/C Long time Inverse curve. Expected electrical life ..10 5 operations 03 O/C Very Inverse curve. Expected mechanical life ..5 x10 6 operations 04 O/C Extremely Inverse curve. 05 O/C Definite time.