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Mikro MK2000 User Manual

Combined overcurrent and earth-fault relay
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MIKRO
MK2000
User's Manual
Combined Overcurrent and Earth-Fault Relay
Features
Multifunction numerical relay
Programmable control outputs
Metering
Fault value recording

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Summary of Contents for Mikro MK2000

  • Page 1 MIKRO MK2000 User’s Manual Combined Overcurrent and Earth-Fault Relay Features Multifunction numerical relay Programmable control outputs Metering Fault value recording...
  • Page 2 MK2000 Page 1 Table of Contents Page 1. Introduction 2. Description of operation 3. Characteristic curves 4. Soft Switches 5. Connection Diagram & Terminal Connection 6. Case Dimensions 7. Technical Data 8. Tests and Standards 9. Appendix A...
  • Page 3 MIKRO Page 2 1. Introduction The MK2000 combined overcurrent and earth-fault relay is a digital microprocessor based relay. This relay employs extensive advanced numerical techniques which are implemented in real time, for the computation of measured input quantity. Other advanced features include programmable control output, metering and fault data storage.
  • Page 4 MK2000 Page 3 2. Description of Operation The MK2000 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. 2.1 Phase Overcurrent Protection When the phase current exceeds the low-set I>...
  • Page 5 2.3 Measuring Elements All the three overcurrent elements and one earth-fault element are provided with user configurable 1A or 5A current transformer inputs. The MK2000 settings are normalized to 1A. If 5A current transformers are used, the user is required to connect the current transformers to the 5A block terminal inputs and normalize all required setting values to 1A before entering it into the relay.
  • Page 6 IRF relay is not user programmable. The function of this relay is for signaling an internal relay failure. When the auxiliary power of the relay is switched on and the MK2000 is functioning normally, the IRF relay output will be energized hence the NC contact will open and the NO contact will close.
  • Page 7 MIKRO Page 6 2.6 Display This light indicates the presence of auxiliary power supply. This light indicates the relay is in start or trip condition. [Refer to section xv. (page 9) on trip status display].
  • Page 8 MK2000 Page 7 iii) The 3-digit display indicates the value of the item selected. If any of the above light is on, the relay is in metering mode. The 3-digit display indicates the corresponding phase current or earth-fault current. When this indicator is lighted, the 3-digit display simultaneously indicates the overcurrent low-set current setting.
  • Page 9 MIKRO Page 8 When this indicator is lighted, the 3-digit display simultaneously indicates the earth-fault low-set current setting. When this indicator is lighted, the 3-digit display simultaneously indicates the earth-fault time multiplier setting. When this indicator is lighted, the 3-digit display simultaneously indicates the earth-fault high-set current setting.
  • Page 10 MK2000 Page 9 xv) Start and trip status display a) Normal condition Under normal operating condition, all the light indicators are switched off except the AUX indicator. If the RESET/STEP key is pressed, the corresponding indicator and the 3-digit display will light up. After 6 minutes, the indicator and the 3-digit display will automatically switch off if no further key is pressed.
  • Page 11 MIKRO Page 10 2.7 Key Button Input i). RESET/STEP key There are two functions associated with this key. • Reset the system when in trip mode. • Scroll the display to view the measured current, recorded fault current and the relay current setting and time setting.
  • Page 12 MK2000 Page 11 ii) The PROGRAM key Pressing this key once to enter into programming mode for the selected items (e.g. I/In). The light indicator for the selected item blinks to indicate that the relay is in programming mode. By pressing this PROGRAM key...
  • Page 13 MIKRO Page 12 2.8 Key Operation of Setting i) To program the settings for I>/In, kt>, I>>/In, t>>, I >/In, kt >, I >>/In and >>. Step 1 Select the required item by stepping through all the items using the RESET/ STEP key.
  • Page 14 MK2000 Page 13 3. Characteristic Curves Both the low-set overcurrent and earth-fault elements can be independently configured to have following IDMT characteristic curves :- • Normal inverse • Very inverse • Extremely inverse • Long-time inverse The relationship between current and time for the above curves comply with the standard IEC255-4 and may generally be expressed as : ___ kβ__...
  • Page 15 MIKRO Page 14 NORMAL INVERSE 0.05 I/I>...
  • Page 16 MK2000 Page 15 VERY INVERSE 0.05 0.01 I/I>...
  • Page 17 MIKRO Page 16 EXTREMELY INVERSE 0.05 0.01 I/I>...
  • Page 18 MK2000 Page 17 LONG-TIME INVERSE 0.05 I/I>...
  • Page 19 MIKRO Page 18 4. Soft Switches These soft switches are for configuring and testing of the MK2000 relay. The functions for all these switches are listed below. Please note that the switch settings are in hexadecimal format. 4.1 Switch Group 1 This switch allows the user to activate the relay output one-by-one.
  • Page 20 MK2000 Page 19 4.2 Switch Group 2 This switch configures the blocking signal and high-set elements selection. HEES HEES HOES HOES BLEH BLEH BLEL BLEL BLOH BLOH BLOL BLOL Default value Default hexadeci- mal value User setting User hexadecimal value* * Refer to Appendix A for the corresponding hexadecimal value.
  • Page 21 MIKRO Page 20 HOES HOES - High-set Overcurrent Element Select This switch activates or de-activates the high-set overcurrent function. The I>> will not operate once de-activated. 1 = High-set overcurrent (I>>) function de-activated 0 = High-set overcurrent (I>>) function activated.
  • Page 22 MK2000 Page 21 4.3 Switch Group 3 This switch group configures the operation characteristic of relay output "START1, (TS1)". ST1EH ST1EL ST1EH ST1EL ST1OH ST1OH ST1OL ST1OL T1EH T1EH T1EL T1EL T1OH T1OH T1OL T1OL Default value Default hexa- decimal value...
  • Page 23 MIKRO Page 22 T1EH T1EH - TS1 High-set Earth-Fault Trip This switch selects or de-selects the linkage between the high-set earth- fault trip signal and the relay output START1 (TS1). 1 = I >> trip signal linked to TS1. 0 = I >>...
  • Page 24 MK2000 Page 23 4.4 Switch Group 4 This switch group configures the operation characteristic of relay output "TRIP, (TS2)". REMOTE REMOTE ELATCH ELATCH ILATCH ILATCH CBFP CBFP T2EH T2EH T2EL T2EL T2OH T2OL T2OH T2OL Default value Default hexa- decimal value...
  • Page 25 MIKRO Page 24 CBFP CBFP - Circuit Breaker Failure Protection This switch enables or disables the circuit breaker failure protection feature. During a fault condition, TS2 output is activated in an attempt to clear the fault. If after a prefixed delay time has lapsed, the fault remains despite the activation of TS2 and this CBFP switch option is enabled, TS1 will be activated.
  • Page 26 MK2000 Page 25 4.5 Switch Group 5 This switch group configures the operation characteristic of relay output "START2, (SS1)". S1EH S1EL S1EH S1EL S1OH S1OH S1OL S1OL MRSEH MRSEH MRSEL MRSEL MRSOH MRSOH MRSOL MRSOL Default value Default hexa- decimal value...
  • Page 27 MIKRO Page 26 MRSEH MRSEH - Manual Reset for High-set Earth-Fault This switch selects or de-selects the manual resetting feature of the relay output SS1 when activated by the high-set earth-fault start signal. = Manual reset of SS1 when activated by high-set earth-fault start signal.
  • Page 28 MK2000 Page 27 4.6 Switch Group 6 This switch group configures the operation characteristic of relay outputs SIGNAL1(SS2) and SIGNAL2(SS3). S3EH S3EH S3EL S3EL S3OH S3OL S3OH S3OL S2EH S2EH S2EL S2EL S2OH S2OH S20L S20L Default value Default hexadeci-...
  • Page 29 MIKRO Page 28 S2EH S2EH - SS2 link to High-set Earth-Fault This switch enables or disables the link between the SS2 output and the high-set earth-fault trip signal. = The high-set earth-fault trip signal is linked to relay output SS2.
  • Page 30 MK2000 Page 29 4.7 Switch Group 7 This switch group configures the characteristic of IDMT curve. Default value Default hexadeci- mal value User setting User hexadecimal value* * Refer to Appendix A for the corresponding hexadecimal value. IE3/IO3 IE3/IO3 IE2/IO2...
  • Page 31 MIKRO Page 30 5. Connection Diagram & Terminal Connection 5.1 Terminal Connection MADE IN MALAYSIA Rear view of MK2000...
  • Page 32 MK2000 Page 31 Terminal Terminal Function Function 5A/1A common CT input for I 5A CT input for I 1A CT input for I 5A/1A common CT input for I 5A CT input for I 1A CT input for I 5A/1A common CT input for I...
  • Page 33 MIKRO Page 32 Example 1: Typical connection diagram...
  • Page 34 MK2000 Page 33 Example 2: Typical connection diagram...
  • Page 35 MIKRO Page 34 6. Case Dimensions...
  • Page 36 - ≤ 10 sec 25 x I for - ≤ 1 sec 100 x I Burden...…………………………………………………………..<0.3 VA at I b) Rated auxiliary voltage Model MK2000-240A………………………………………190 V to 265 V Model MK2000-240AD…………………………………….85 V to 265 V 110 V to 340 V Model MK2000-24D…………………………………………18 V...
  • Page 37 MIKRO Page 36 b) Signaling contacts Rated voltage………………………………………………………250 V Continuous carry NO contact……………………………………………………….5A ac or dc NC contact……………………………………………………….2A ac or dc Make and carry for 0.2 sec…………………………..………10A ac or dc Minimum number of operations at maximum load…………………………………………………10,000 operation 7.3 Overcurrent element Low-set setting I>…………………………………………………...
  • Page 38 MK2000 Page 37 8. Test and Standards High voltage dielectric withstand test IEC60255-5……..2.0KV rms, 1 min High voltage impulse test. IEC60255-5……………………..5KV, 1.2/50ì s Electrical fast transient. IEC61000-4-4, Level 4, power supply inputs…………………………………….4KV, 5/50ns Electrical fast transient. IEC61000-4-4, Level 4, other inputs…………..…………………………………….2KV, 5/50ns Electrostatic discharge.
  • Page 39 MIKRO Page 38 9. Appendix A Hexadecimal ↔ - Binary conversion table:- Hexadecimal Binary 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111...
  • Page 40 OE001-0010A PRINTED IN MALAYSIA...

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