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Technical Guide P12y/EN T04/A11
MiCOM P125/P126/P127
CHAPTER 4Technical Data and
Characteristic Curves
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 1/40
CONTENTS
1. RATINGS 3
1.1 Power supply 3
1.2 Frequency 3
1.3 Current Inputs 3
1.4 Voltage Inputs 4
1.5 Logic inputs 4
1.6 Output relay contacts 4
2. HIGH VOLTAGE WITHSTAND 5
3. ELECTRICAL ENVIRONMENT 5
4. ENVIRONMENT 5
5. PROTECTION ACCURACY 6
6. AUTOMATION FUNCTIONS ACCURACY TIMERS 8
7. MEASUREMENT ACCURACY 8
8. PROTECTION SETTING RANGES 9
8.1 [67/50/51] Directional/non directional phase Overcurrent (P127 only) 9
8.1.1 Synchronous polarisation 9
8.1.2 Protection setting ranges (Only P127) 9
8.2 [50/51] Phase Overcurrent Protection (P126 Only) 10
8.2.1 Protection setting ranges (Only P126) 10
8.3 [67N/50N/51N] Neutral/Ground/Earth Directional/non Directional EarthOvercurrent Protection (P125, P126 & P127) 10
8.3.1 Protection setting ranges 11
8.4 Earth Wattmetric Protection (P125, P126 & P127) 13
8.5 Functionality mode 13
8.5.1 Protection setting ranges 13
8.6 Undercurrent protection (P126 & P127 only) 15
8.6.1 Protection setting ranges 15
8.7 Negative sequence overcurrent protection (P126 & P127 only) 15
8.7.1 Protection Setting Ranges 15
8.8 Thermal overload protection (P126 & P127 only) 15
8.8.1 Protection setting ranges 15
P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 2/40 MiCOM P125/P126/P127
8.9 Under Voltage protection (P127 only) 16
8.9.1 Protection setting ranges (only P127) 16
8.10 Over Voltage protection (P127 only) 17
8.10.1 Protection setting ranges (only P127) 17
8.11 Residual Over Voltage protection (P125, P126 & P127) 18
8.11.1 Protection setting ranges 18
8.12 Multishot Autorecloser function (P126 & P127) 18
8.12.1 Multishot Autorecloser settings 19
9. AUTOMATION CONTROL FUNCTIONS 20
9.1 Cold load pickup (P126 & P127) 20
9.2 Auxiliary timers (P126 & P127) 20
9.3 Broken conductor detection (P126 & P127) 20
9.3.1 Broken conductor detection setting ranges 20
9.4 Circuit breaker failure (P126 & P127) 20
9.4.1 CB Fail setting ranges 20
9.5 Trip circuit supervision (P126 & P127) 20
9.5.1 Trip circuit supervision setting ranges 20
9.6 Circuit breaker control and monitoring (P126 & P127) 21
9.6.1 Setting ranges 21
9.7 AND logic equation (P126 & P127) 21
9.7.1 Timer setting ranges 21
10. RECORDING FUNCTIONS (P126 & P127) 22
10.1 Event recorder 22
10.2 Fault recorder 22
10.3 Disturbance recorder 22
10.3.1 Triggers; Data; Setting Ranges 22
11. COMMUNICATION (P125, P126, P127) 23
12. CURVES 24
12.1 General 24
12.1.1 Inverse Time Curves : 24
12.1.2 Reset timer 25
12.2 IDMT Curves 26
12.2.1 IEC Curves 26
12.2.2 RI Curves 32
12.2.3 IEEE/ANSI CURVES 33
12.3 Thermal overload curves 39
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 3/40
1. RATINGS
1.1 Power supply
Power Supply range 24-60Vdc48-150Vdc130-250Vdc / 100-250Vac 50/60Hz
Power supply variations D.C. ± 20 %A.C. 20%, +10%
Ripple 12%
Power off withstand 50 ms
Burden P125 Stand by: <3W dc or <8VA acMax: <5W dc or <12VA ac
Burden P126 Stand by: <3W dc or <8VA acMax: <6W dc or <14VA ac
Burden P127 Stand by: <3W dc or <8VA acMax: <6W dc or <14VA ac
1.2 Frequency
Functionality frequency range From 45 to 65Hz
Rated Frequency 50/60Hz
1.3 Current Inputs
Phase current inputs 1 and 5 Amps by connection
Earth current inputs 1 and 5 Amps by connection
Operating range By ordering code (Cortec)
Burden Phase Current < 0.025 VA (1A)< 0.3 VA (5A)
Burden Earth Current < 0.008 VA (1A)< 0.010 VA (5A)
Thermal withstand 1s @ 100 x rated current2s @ 40 x rated currentcontinuous @ 4 x rated current
P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 4/40 MiCOM P125/P126/P127
1.4 Voltage Inputs
Voltage input range 57 to 130V
Operating range 0 to 260V (measuring range)
Burden Resistive 44 kohm: 0.074W/57Veff0.38W/130Veff 1.54W/260Veff
Thermal Withstand
Continuous 260Vph - ph eff
10 seconds 300Vph - ph eff
Voltage input range 220 to 480V
Operating range 0 to 960V (measuring range)
Burden 438 kohm: 0.1102W/220Veff0.525W/480Veff2.1W/960Veff
Thermal Withstand
Continuous 960V ph-ph eff
10 seconds 1300V ph-ph eff
1.5 Logic inputs
Logic input type Independent optically insulated
Logic input burden 10 mA per input
Logic input recognition time <5ms
Voltage input
24-60 Vdc supply range relay from 19.2 Vdc to 72 Vdc
48-150 Vdc supply range relay from 38.4 Vdc to 180 Vdc
130-250 Vdc supply range relay from 130 Vdc to 300 Vdc
1.6 Output relay contacts
Logic output type Dry contact Ag Cdo
Logic output rating
Make & carry 30A for 3 s
Carry 5A continuos
Break 135 Vdc, 0.3 Amps (L/R = 30 ms)250 Vdc, 50 W resistive or 25Winductive (L/R=40ms)220 Vac, 5 Amps (cos ϕ = 0.6)
Maximum 5A and 300V
Loaded contact 10000 operation minimum
Unloaded contact 100000 operation minimum
Operation time <7ms
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 5/40
2. HIGH VOLTAGE WITHSTAND
Dielectric withstand IEC 60-255-5 2 kV common mode1 kV differential mode
Impulse voltage IEC 60-255-5 5 kV common mode1 kV differential mode
Insulation resistance IEC 60-255-5 > 1000 MΩ
3. ELECTRICAL ENVIRONMENT
High frequency IEC 1000-4-1 2.5 kV common mode, class 3disturbance 1 kV differential mode, class 3
Fast transient IEC 1000-4-4 4 4 kV auxiliary voltage, class 4ANSI C37.90.1 2 kV others, class4
Electrostatic IEC 1000-4-2 8 kV, class 4discharge
Radio frequency ANSI C37.90.2 35 V/mimpulse IEC 1000-4-3 10 V/m
4. ENVIRONMENT
Temperature IEC 60-255-6 Storage -25°C to +70°COperation -25°C to + 55 °C
Humidity IEC 600-68-2-3 56 days at 93% RH and 40°C
Enclosure protection IEC 60-529 IP 52, IK 07
Vibrations IEC 60-255-21-1 Response and endurance, class 2
Shocks and bumps IEC 60-255-21-11 Response and withstand, class 1
Seismic IEC 60-255-21-3 Class 1
P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 6/40 MiCOM P125/P126/P127
5. PROTECTION ACCURACY
Glossary
I : Phase current
Is : I>, I>> & I>>>
I2s : I2>, I2>> & I2>>>
Ies : Ie>, Ie>> & Ie>>>
Iescos : Iecos> & Iecos>>
Pe : Earth fault Power
Pes : Pe> & Pe>>
Us : U>, U>>, U<, U<<
Urs : Ue>, Ue>>, Ue>>>, Ue>>>>
DT : Definite time
IDMT : Inverse time
Element Range Accuracy Trigger Reset Time accuracy
Phase OvercurrentelementsI> & I>> & I>>>
0.1 to 40 In ± 2% DT: Is ± 2%IDMT: 1.1Is ±2%
0.95 Is ±2%1.05 Is ±2%
±2% +3050ms ±5% +3050ms
Relay CharacteristicAngle (Torque angle)
0° to 359° ≤ 2°
Trip zone ±10° to ±170° ≤ 2°
Earth Fault OvercurrentelementsIe> & Ie>> & Ie>>>
0.002 to 1Ien0.01 to 8 Ien0.1 to 40 Ien
± 2% DT: Ies ± 2%IDMT: 1.1Ies ±2%
0.95 Ies ±2%1.05 Ies ±2%
±2% +3050ms ±5% +3050ms
Wattmetric Earth Faultelements
57 to 130V0.2 to 20W1 to 160W10 to 800W
±4% ± erroron cosϕ
DT: Pes± accuracyIDMT: 1.1Pes± accuracy
0.95 Pes± accuracy1.05 Pes± accuracy
±2% +3050ms
±5% +3050ms
Wattmetric Earth FaultelementsPe> & Pe>>
220 to 480V1 to 80W4 to 640W40 to 3200W
±4% ± erroron cosϕ
DT: Pes± accuracyIDMT: 1.1Pes± accuracy
0.95 Pes ±accuracy1.05 Pes ±accuracy
±2% +3050ms
±5% +3050ms
Active Earth faultovercurrent elements.Iecosϕ> & Iecosϕ>>
0.002 to 1Ien0.01 to 8 Ien0.1 to 40 Ien
±2% ± erroron cosϕ
DT: Iescos± accuracyIDMT: 1.1 Iescos± accuracy
0.95 Iescos ±accuracy1.05 Iescos ±accuracy
±2% +3050ms
±5% +3050ms
Negative SequencePhase OvercurrentelementsI2>, I2>> & I2>>>
0.1 to 40 In ± 2% DT: I2s ± 2%IDMT: 1.1I2s ±2%
0.95 Is ±2%1.05 Is ±2%
±2% +3050ms ±5% +3050ms
Phase Undercurrentelement I<
0.1 to 1 In ± 2% DT: I< ± 2% 0.95 Is ±2% ±2% +3050ms
Broken conductor[I2/I1].
20 to 100% ± 3% DT: I2/I1 ± 3% 0.95 I2/I1 ±3% ±2% +3050ms
Thermal OverloadIθ>, θ Alarm, θ Trip
0.10 to 3.2 In ± 3% DT: Iθ> ± 3% 0.97 Iθ>±3% ±2% +3050ms
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 7/40
Element Range Accuracy Trigger Reset Time accuracy
Over voltageU> & U>>
57 to 130V2 to 260V
± 2% DT: Us ± 2% 0.95 Is ±2% ±2% +2040ms
Over voltageU> & U>>
220 to 480V10 to 960V
± 2% DT: Us ± 2% 0.95 Is ±2% ±2% +2040ms
Under voltageU< & U<<
57 to 130V2 to 130V
± 2% DT: Us ± 2% 0.95 Us ±2% ±2% +2040ms
Under voltageU< & U<<
220 to 480V10 to 480V
± 2% DT: Us ± 2% 0.95 Us ±2% ±2% +2040ms
Residual Over voltage(Direct Input)Ue>, Ue>>, Ue>>>,Ue>>>>
57 to 130V
1 to 260V1 to 260V
± 2% DT: Urs ± 2% 0.95 Urs ±2% ±2% +2040ms
Residual Over voltage(Direct Input)Ue>, Ue>>, Ue>>>,Ue>>>>
220 to 480V
4 to 960V5 to 960V
± 2% DT: Urs ± 2% 0.95 Urs ±2% ±2% +2040ms
Derived Residual OvervoltageUe>, Ue>>, Ue>>>,Ue>>>>
57 to 130V
1 to 260V1 to 260V
greater of± 2%or 0.2V
DT: Urs ± 2% 0.95 Urs ±2% ±2% +2040ms
Derived Residual OvervoltageUe>, Ue>>, Ue>>>,Ue>>>>
220 to 480V
4 to 960V5 to 960V
greater of± 2%or 1V
DT: Urs ± 2% 0.95 Urs ±2% ±2% +2040ms
P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 8/40 MiCOM P125/P126/P127
6. AUTOMATION FUNCTIONS ACCURACY TIMERS
Recloser timers tDs, tR, tI ±2% +1030ms
CB fail & CB monitoring timers ±2% +1030ms
Auxiliary timers t_AUX1 & t_AUX2 ±2% +1030ms
Cold load Pick Up ±2% +2040ms
Programmable AND logic ±2% +1030ms
7. MEASUREMENT ACCURACY
Measurement Range Accuracy
Phase Current 0.1 to 40 In Typical ±0.5% at In
0.002 to 11Ien Typical ±0.5% at Ien
0.01 to 8 Ien Typical ±0.5% at Ien
Earth current
0.1 to 40 Ien Typical ±0.5% at Ien
57 to 260V Typical ±0.5% at UnVoltage
220 to 960V Typical ±0.5% at Un
Active Power and Active Energy Reactive Power and Reactive Energy
Cos ϕ Accuracy Sin ϕ Accuracy
0.866 < 1.5% 0.866 < 3%
0.5 < 3% 0.5 < 1.5%
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 9/40
8. PROTECTION SETTING RANGES
8.1 [67/50/51] Directional/non directional phase Overcurrent (P127 only)
− Phase current Fundamental only
− Phase or phase to phase voltage Fundamental only
− Minimum voltage operating 0.6V
8.1.1 Synchronous polarisation
− Minimum phase voltage fixed threshold enabling synchronous polarising:0.6V
− Synchronous polarising permanence time phase voltage thresholds:5s
8.1.2 Protection setting ranges (Only P127)
[67] Phase OC Setting Range
I> No or DIR non DIR
I> Current set 0.1 In 25 In 0.01 In
Delay type DT or IDMT (IEC_STI, IEC_SI, IEC_VI,IEC_EI, IEC_LTI, C02, C08, IEEE_MI,IIEEE_VI, IEEE_EI, RI curve)
I> Trip delay time 0 s 150s 0.01s
I> TMS 0.025 1.5 0.025
I> Reset char DT or IDMT
I> RTMS 0.025 1.5 0.025
I> tReset 0.00 s 100 s 0.01 s
Interlock I> byI>>I>>>
No or Yes
I> Torque angle 0° 359° 1°
I> Trip zone ±10° ±170° 1°
I>> No or Yes or DIR
I>> Current set 0.5 In 40 In 0.01 In
I>> Trip delay time 0 s 150s 0.01s
I>> Torque angle 0° 359° 1°
I>> Trip zone ±10° ±170° 1°
I>>> No or Yes or DIR
I>>> Current set 0.5 In 40 In 0.01 In
I>>>Trip delay time 0 s 150s 0.01s
I>>> Torque angle 0° 359° 1°
I>>> Trip zone ±10° ±170° 1°
P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 10/40 MiCOM P125/P126/P127
8.2 [50/51] Phase Overcurrent Protection (P126 Only)
− Phase current Fundamental only
8.2.1 Protection setting ranges (Only P126)
[51] Phase OC Setting Range
I> No or Yes
I> Current set 0.1 In 25 In 0.01 In
Delay type DT or IDMT (IEC_STI, IEC_SI, IEC_VI,IEC_EI, IEC_LTI, C02, C08, IEEE_MI,IIEEE_VI, IEEE_EI, RI curve)
I> Trip delay time 0 s 150s 0.01s
I> TMS 0.025 1.5 0.025
I> Reset char DT or IDMT
I> RTMS 0.025 1.5 0.025
I> tReset 0.00 s 100 s 0.01 s
Interlock I> byI>>I>>>
No or Yes
I>> No or Yes or DIR
I>> Current set 0.5 In 40 In 0.01 In
I>> Trip delay time 0 s 150s 0.01s
I>>> No or Yes
I>>> Current set 0.5 In 40 In 0.01 In
I>>>Trip delay time 0 s 150s 0.01 s
8.3 [67N/50N/51N] Neutral/Ground/Earth Directional/non Directional EarthOvercurrent Protection (P125, P126 & P127)
− Earth Current Fundamental only
− Earth current ranges See following table
− Residual voltage Fundamental only
− Residual voltage range See following table
− Minimum Residual voltage operation 1V (Uen: 57 to 130V)
− Minimum Residual voltage operation 3V (Uen: 220 to 480V)
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 11/40
8.3.1 Protection setting ranges
[67N] Earth OC Setting Range
High sensitivitycurrent set
Cortec code P12-C-X---X
Ie> 0.002 Ien 1 Ien 0.001 Ien
Ie>> 0.002 Ien 1 Ien 0.001 Ien
Ie>>> 0.002 Ien 1 Ien 0.001 Ien
Med. sensitivitycurrent set
Cortec code P12-B-X---X
Ie> 0.01 Ien 1 Ien 0.005 Ien
Ie>> 0.01 Ien 8 Ien 0.005 Ien
Ie>>> 0.01 Ien 8 Ien 0.005 Ien
Low sensitivitycurrent set
Cortec code P12-A-X---X
Ie> 0.1 Ien 25 Ien 0.1 Ien
Ie>> 0.5 Ien 40 Ien 0.1 Ien
Ie>>> 0.5 Ien 40 Ien 0.1 Ien
Ie> No or Yes or DIR
Delay type DT or IDMT (IEC_STI, IEC_SI, IEC_VI,IEC_EI, IEC_LTI, C02, C08, IEEE_MI,IIEEE_VI, IEEE_EI, RI curve)
Ie> Trip delay time 0 s 150s 0.01s
Ie> TMS 0.025 1.5 0.025
Ie> Reset char DT or IDMT
Ie> RTMS 0.025 1.5 0.025
Ie> tReset 0.00 s 100 s 0.01 s
Interlock Ie> byIe>>Ie>>>
No or Yes
Ie> Torque angle 0° 359° 1°
Ie> Trip zone ±10° ±170° 1°
Input residual voltage with range from 57 to 130V
Ue> 1 V 260 V 0.1 V
Input residual voltage with range from 220 to 480V
Ue> 4 V 960 V 0.5 V
Ie>> No or Yes or DIR
Ie>> Trip delay time 0 s 150s 0.01s
Ie>> Torque angle 0° 359° 1°
Ie>> Trip zone ±10° ±170° 1°
Ie>> tReset 0.00 s 100 s 0.01 s
Input residual voltage with range from 57 to 130V
P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 12/40 MiCOM P125/P126/P127
[67N] Earth OC Setting Range
Ue>> 1 V 260 V 0.1 V
Input residual voltage with range from 220 to 480V
Ue>> 4 V 960 V 0.5 V
Ie>>> No or Yes or DIR
Ie>>>Trip delay time 0 s 150s 0.01s
Ie>>> Torque angle 0° 359° 1°
Ie>>> Trip zone ±10° ±170° 1°
Ie>>> tReset 0.00 s 100 s 0.01 s
Input residual voltage From 57 to 130V
Ue>>> 1 V 260 V 0.1 V
Input residual voltage From 220 to 480V
Ue>>> 4 V 960 V 0.5 V
ATTENTION : THE UE THRESHOLDS SETTING DEPEND ON THE ADOPTEDWIRING SCHEME. IN CONFIGURATION/GENERAL OPTIONMENU OF THE P127 RELAY YOU CAN SET THE VE INPUTDIRECTLY FROM A VT(I.E. FROM A DELTA VT) OR DERIVED FROMTHE MEASUREMENT OF THE THREE PHASE TO NEUTRALVOLTAGE (3VPN). IN THIS CASE THE UE IS CALCULATED AS:
CUBUAxUUe
++=31
THE SETTING OF THE UE THRESHOLDS MUST TAKE IN ACCOUNTTHE ABOVE FORMULA.
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 13/40
8.4 Earth Wattmetric Protection (P125, P126 & P127)
− Earth current Fundamental only
− Residual Voltage Fundamental only
8.5 Functionality mode
This protection can work in Pe or Iecos mode.
8.5.1 Protection setting ranges
[32N] Earth Wattmetric
Setting range
Mode Pe or Iecos
High sensitivity: Current input from 0.002 to 1 Ien
57130V Input voltage Cortec code: P12-CAX---X
Pe> (*) 0.2 x k W 20 x k W 0.02 x k W
Pe>> (*) 0.2 x k W 20 x k W 0.02 x k W
220480V Input voltage Cortec code: P12-CBX---X
Pe> (*) 1 x k W 80 x k W 0.1 x k W
Pe>> (*) 1 x k W 80 x k W 0.1 x k W
Med. sensitivity Current input from 0.01 to 8 Ien
57130V Input voltage Cortec code: P12-BAX---X
Pe> (*) 1 x k W 160 x k W 0.1 x k W
Pe>> (*) 1 x k W 160 x k W 0.1 x k W
220480V Input voltage Cortec code: P12-BBX---X
Pe> (*) 4 x k W 640 x k W 0.5 x k W
Pe>> (*) 4 x k W 640 x k W 0.5 x k W
Low sensitivity Current input from 0.1 to 40 Ien
57130V Input voltage Cortec code: P12-AAX---X
Pe> (*) 10 x k W 800 x k W 1 x k W
Pe>> (*) 10 x k W 800 x k W 1 x k W
220480V Input voltage Cortec code: P12-ABX---X
Pe> (*) 40 x k W 3200 x k W 5 x k W
Pe>> (*) 40 x k W 3200 x k W 5 x k W
Pe> No or Yes
Delay type DT or IDMT (IEC_STI, IEC_SI, IEC_VI,IEC_EI, IEC_LTI, C02, C08, IEEE_MI,IIEEE_VI, IEEE_EI,RI curve)
tPe> Trip delay time 0 s 150s 0.01s
Pe> TMS 0.025 1.5 0.025
Pe> Reset char DT or IDMT
Pe> RTMS 0.025 1.5 0.025
P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 14/40 MiCOM P125/P126/P127
[32N] Earth Wattmetric
Pe> tReset 0.00 s 100 s 0.01 s
Pe>> No or Yes
tPe>> Trip delay time 0 s 150 s 0.01 s
Pe>> tReset 0.00 s 100 s 0.01 s
High sensitivity Iecos Cortec code P12-C-X---X
IeCos> 0.002 Ien 1 Ien 0.001 Ien
IeCos>> 0.002 Ien 1 Ien 0.001 Ien
Med. sensitivity Iecos Cortec code P12-B-X---X
IeCos> 0.01 Ien 8 Ien 0.005 Ien
IeCos>> 0.01 Ien 8 Ien 0.005 Ien
Low sensitivity Iecos Cortec code P12-A-X---X
IeCos> 0.1 Ien 25 Ien 0.01 Ien
IeCos>> 0.5 Ien 40 Ien 0.01 Ien
IeCos> Yes or No
Delay type DT or IDMT (IEC_STI, IEC_SI, IEC_VI,IEC_EI, IEC_LTI, C02, C08, IEEE_MI,IIEEE_VI, IEEE_EI, RI curve)
IeCos> Trip delay time 0 s 150s 0.01s
IeCos> TMS 0.025 1.5 0.025
IeCos> Reset type DT or IDMT
IeCos> RTMS 0.025 1.5 0.025
IeCos> tReset 0.00 s 100 s 0.01 s
IeCos>> Yes or No
IeCos>>Trip delay time 0 s 150s 0.01s
IeCos> tReset 0.00 s 100s 0.01s
Pe/IeCos Angle 0° 359° 1°
(*) ATTENTION : THE PE THRESHOLDS ARE DISPLAYED IN THE FORMAT: ##.## X K WTHE THRESHOLD VALUE WILL BE IN WATT SECONDARY.E.G. YOU ARE SETTING PE> THRESHOLD ON THE RELAY DISPLAY;YOU HAVE WRITTEN 20.IF IEN = 1A, THE INTERNAL RELAY SETTING VALUE WILL BE EQUAL TO20 X 1 = 20W.IF IEN = 5A, THE INTERNAL RELAY SETTING VALUE WILL BE EQUAL TO20 X 5 = 100W.
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 15/40
8.6 Undercurrent protection (P126 & P127 only)
− Undercurrent associated to the breaker failure function
− Phase current: Fundamental only
8.6.1 Protection setting ranges
[37] Under Current Setting ranges
I< No or Yes
I< 0.1 In 1 In 0.01 In
tI< 0 s 150 s 0.01 s
8.7 Negative sequence overcurrent protection (P126 & P127 only)
− Phase current: Fundamental only
8.7.1 Protection Setting Ranges
[46] Neg.Seq. OC Setting ranges
I2> No or Yes
I2> 0.1 In 25 In 0.01 In
Delay type DT or IDMT (IEC_STI, IEC_SI, IEC_VI,IEC_EI, IEC_LTI, C02, C08, IEEE_MI,IIEEE_VI, IEEE_EI, RI curve)
I2> Trip delay time 0 s 150s 0.01s
I2> TMS 0.025 1.5 0.025
I2> Reset char DT or IDMT
I2> RTMS 0.025 1.5 0.025
I2> tReset 0.04 s 100 s 0.01 s
I2>> No or Yes
I2>> Current set 0.5 In 40 In 0.01 In
I2>> Trip delay time 0 s 150s 0.01s
I2>>> No or Yes
I2>>> Current set 0.5 In 40 In 0.01 In
I2>>>Trip delay time 0 s 150s 0.01s
8.8 Thermal overload protection (P126 & P127 only)
− Phase Current: RMS
8.8.1 Protection setting ranges
[49]Therm. OL Setting ranges
Therm. OL No or Yes
Iθ 0.1 In 3.2 In 0.01
Te 1 mn 200 mn 1mn
k 1 1,5 0.01
θ Trip 50% 200% 1%
θ Alarm No or Yes
θ Alarm 50% 200% 1%
P12y/EN T04/A11 Technical GuideCHAPTER 4 Technical DataPage 16/40 MiCOM P125/P126/P127
8.9 Under Voltage protection (P127 only)
− Phase or phase to phase voltage Fundamental only
− Thresholds selection mode AND or OR (*)
8.9.1 Protection setting ranges (only P127)
[27] Phase Under Voltage
Setting ranges
57130V Inputvoltage.
Cortec code: P127-AX---X
U< No or AND or OR
U< 2 V 130 V 0.1 V
tU< 0 s 600 s 0.01 s
U<< No or AND or OR
U<< 2 V 130 V 0.1 V
tU<< 0 s 600 s 0.01 s
220480V Inputvoltage.
Cortec code: P127-BX---X
U< No or AND or OR
U< 10 V 480 V 0.5 V
tU< 0 s 600 s 0.01 s
U<< No or AND or OR
U<< 10 V 480 V 0.5 V
tU<< 0 s 600 s 0.01 s
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 17/40
8.10 Over Voltage protection (P127 only)
− Phase or phase to phase voltage Fundamental only
− Thresholds selection mode AND or OR (*)
8.10.1 Protection setting ranges (only P127)
[59] Phase Over Voltage
Setting ranges
57130V Inputvoltage.
Cortec code: P127-AX---X
U> No or AND or OR
U> 2 V 260 V 0.1 V
tU> 0 s 260 s 0.01 s
U>> No or AND or OR
U>> 2 V 260 V 0.1 V
tU>> 0 s 600 s 0.01 s
220480V Inputvoltage.
Cortec code: P127-BX---X
U> No or AND or OR
U> 10 V 960 V 0.5 V
tU> 0 s 600 s 0.01 s
U>> No or AND or OR
U>> 10 V 960 V 0.5 V
tU>> 0 s 600 s 0.01 s
(*) OR = trip caused by one or two or three phase start.AND = trip only caused by three phase start
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8.11 Residual Over Voltage protection (P125, P126 & P127)
− Residual voltage: Fundamental only
8.11.1 Protection setting ranges
[59] Residual Over Voltage
Setting ranges
57130V Inputvoltage.
Cortec code: P127-AX---X
Ue>>>> No or Yes
Ue>>>> 1 V 260 V 0.1 V
TUe>>>> 0 s 600 s 0.01 s
220480V Inputvoltage.
Cortec code: P127-BX---X
Ue>>>> No or Yes
Ue>>>> 5 V 960 V 0.5 V
tUe>>>> 0 s 600 s 0.01 s
ATTENTION : THE UE THRESHOLDS SETTING DEPEND ON THE ADOPTEDWIRING SCHEME. IN CONFIGURATION/GENERAL OPTIONMENU OF THE P127 RELAY YOU CAN SET THE VE INPUTDIRECTLY FROM A VT(I.E. FROM A DELTA VT) OR DERIVED FROMTHE MEASUREMENT OF THE THREE PHASE TO NEUTRALVOLTAGE (3VPN). IN THIS CASE THE UE IS CALCULATED AS:
CUBUAxUUe
++=31
THE SETTING OF THE UE THRESHOLDS MUST TAKE IN ACCOUNTTHE ABOVE FORMULA.
8.12 Multishot Autorecloser function (P126 & P127)
− Main shots 4 independent shots
− External logic inputs 6 inputs (CB opened signal, CB closedsignal, manual opening command, manual closing command, blocking order,cycle activation)
− Internal programmable trigger from phase and earth fault on all reclosingcycles
− External trigger from digital input.
− Inhibit time on manual closing.
− Programmable dead and reclaim time setting.
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 19/40
8.12.1 Multishot Autorecloser settings
[79] Autoreclose Setting ranges
Autoreclose Yes or No
Ext. CB Fail Yes or No
Ext. CB Fail time 0.01s 600s 0.01 s
Ext. Aux1 ((I>) Yes or No
Ext. Aux2 (Ie>) Yes or No
Ext. Block Yes or No
td1 Dead time 1 0.01 s 300 s 0.01 s
td2 Dead time 2 0.01 s 300 s 0.01 s
td3 Dead time 3 0.01 s 600 s 0.01 s
td4 Dead time 4 0.01 s 600 s 0.01 s
tR Reclain time 0.02 s 600 s 0.01 s
Inhib Time tI 0.02 s 600 s 0.01 s
Phase Cycle 0 4 1
E/Gnd Cycle 0 4 1
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9. AUTOMATION CONTROL FUNCTIONS
9.1 Cold load pickup (P126 & P127)
Cold Load Pick Up Setting ranges
Level 100% 500% 1%
tCL 0.1 s 3600 s 0.1 s
9.2 Auxiliary timers (P126 & P127)
Auxiliary timer 2 associated to the logic Inputs Aux 1, Aux2
Auxiliary timers Setting ranges
tAux1 0 200s 0.01s
tAux2 0 200s 0.01s
9.3 Broken conductor detection (P126 & P127)
Principle used I2/I1
9.3.1 Broken conductor detection setting ranges
Broken Conductor Setting ranges
Brkn.Cond Yes or No
Brkn.Cond 20% 100% 1%
Brkn.Cond Time 0 s 14400 s 1 s
9.4 Circuit breaker failure (P126 & P127)
9.4.1 CB Fail setting ranges
CB Fail Setting ranges
CB Fail Yes or No
CB Fail Time tBF 0 s 10 s 0.01 s
9.5 Trip circuit supervision (P126 & P127)
9.5.1 Trip circuit supervision setting ranges
TC Supervision Setting ranges
TC Supervision Yes or No
t Trip Circuit 0.1 s 10 s 0.1 s
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9.6 Circuit breaker control and monitoring (P126 & P127)
9.6.1 Setting ranges
CB Supervision Setting ranges
CB Open Svision Yes or No
CB Open time 0.05 s 1 s 0.01 s
CB Close Svision Yes or No
CB Close time 0.05 s 1 s 0.01 s
CB Open Alarm Yes or No
CB Open NB 0 50000 1
ΣAmps(n) 0 E6 A 4000 E6A
1E6 A
n 1 2 1
CB Open pulse Yes or No
tOpen Pulse 0.1 s 5 s 0.1 s
tClose Pulse 0.1 s 5 s 0.1 s
9.7 AND logic equation (P126 & P127)
For the AND logic equations a setting value 1 assigns the function to the equation, asetting value 0 does not assign the function to equation.
9.7.1 Timer setting ranges
AND LOGIC EQUATTdelay
EQU. A Toperator 0 s 3600 s 0.1 s
EQU. A Treset 0 s 3600 s 0.1 s
EQU. B Toperator 0 s 3600 s 0.1 s
EQU. B Treset 0 s 3600 s 0.1 s
EQU. C Toperator 0 s 3600 s 0.1 s
EQU. C Treset 0 s 3600 s 0.1 s
EQU. D Toperator 0 s 3600 s 0.1 s
EQU. D Treset 0 s 3600 s 0.1 s
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10. RECORDING FUNCTIONS (P126 & P127)
10.1 Event recorder
Capacity 75 events
Time-tag 1 millisecond
Triggers Any selected protection alarm andthreshold
Logic input change of state
Setting changes
Self test events
10.2 Fault recorder
Capacity 5 faults
Time-tag 1 millisecond
Triggers Any selected protection alarm andthreshold
Data Fault date
Protection thresholds
Setting Group
AC inputs measurements (RMS)
Fault measurements
10.3 Disturbance recorder
10.3.1 Triggers; Data; Setting Ranges
DisturbanceRecord
P126 P127
Triggers Any selected protection alarm and threshold, Logic input
Remote command
Data AC input channels
Digital input and output states
Frequency value
Default value Setting ranges
Pre-Time 2.5 2.5 0.1 3 0.1
Post-Time 0.5 0.5 0.1 3 0.1
Disturb rec Trig ON TRIP ON TRIP ON TRIP or ON INST.
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11. COMMUNICATION (P125, P126, P127)
TypePort
Relayposition Physical Link Connectors Data Rate Protocol
RS485 Rear port Screened twisterpair
Screws orsnap-on
300 to 38400 baud(programmable)
ModBus RTU,Courier,IEC60870-5-103,DNP3
RS232 Front port Screened twisterpair
SubD 9 pinfemaleconnector
300 to 38400 baud(programmable)
ModBus RTU
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12. CURVES
12.1 General
Although the curves tend towards infinite when the current approaches Is (generalthreshold), the minimum guaranteed value of the operating current for all the curveswith the inverse time characteristic is 1.1Is (with a tolerance of ± 0,05Is.
12.1.1 Inverse Time Curves :
The first phases (earth) overcurrent threshold can be selected with a dependent timecharacteristic. The time delay is calculated with a mathematical formula.
In all, there are eleven inverse time characteristics available.
The mathematical formula applicable to the first ten curves is :
( )
+
−×= L
IIKTtS 1α
Where:
t operation time
K Coefficient (see table)
I Value of measured current
Is Value of the programmed threshold (Pick-up value)
α constant
L ANSI/IEEE constant (zero for IEC curves)
T Time Multiplier Setting
Type of curve Standard K factor αααα factor L factor
Short Time Inverse ALSTOM 0.05 0.04 0
Standard inverse IEC 0.14 0.02 0
Very inverse IEC 13.5 1 0
Extremely inverse IEC 80 2 0
Long time inverse ALSTOM 120 1 0
Short Time Inverse C02 0.02394 0.02 0.00169
Moderately Inverse ANSI/IEEE 0.0515 0.02 0.114
Long Time Inverse C08 5.95 2 0.18
Very Inverse ANSI/IEEE 19.61 2 0.491
Extremely Inverse ANSI/IEEE 28.2 2 0.1215
The RI curve has the following definition:
( )IsI
K = t236,0339,0
1
−⋅
Technical Guide P12y/EN T04/A11Technical Data CHAPTER 4MiCOM P125/P126/P127 Page 25/40
K setting: from 0,10 to 10 in steps of 0,05.The equation is valid for 1.1≤ I/Is ≤ 20.
12.1.2 Reset timer
The first stage of the phase and earth overcurrent protections, negative sequenceovercurrent and wattmetric/IeCos are provided with a timer hold facility "t Reset".
It may be set to a definite time value or to an inverse time characteristic (IEEE/ANSIcurves only). This may be useful in certain applications, for example when gradingwith upstream electromechanical overcurrent relays which have inherent reset timedelays.
The second and third stages for the wattmetric/Iecos protection and earth faultovercurrent protection have a definite time reset.
A possible situation where the reset timer may be used is to reduce fault clearancetimes where intermittent faults occur.
An example may occur in a plastic insulated cable.
In this application it is possible that the fault energy melts and reseals the cableinsulation extinguishing the fault.
The permanence of the fault current pulses reduce intervals between the pulses untilthe fault becomes permanent.
When the reset time of the relay is to minimum setting, the relay will be repeatedlyreset and not be able to trip until the fault becomes permanent. By using the resettimer hold facility the relay will integrate the fault current pulses, thereby reducingfault clearance time.
The mathematical formula applicable to the five curves is:
( )
−×= α
SIIKTt
1
Where:
t : Reset time
K : Coefficient (see table)
I : Value of the measured current
Is : Value of the programmed threshold (pick-up value)
α: Coefficient (see table)
T : Reset Time Multiplier (Rtms) between 0.025 and 1.5.
Type of curve Standard K factor αααα factor
Short Time Inverse C02 0.02394 2
Moderately Inverse ANSI/IEEE 0.0515 2
Long Time Inverse C08 5.95 2
Very Inverse ANSI/IEEE 19.61 2
Extremely Inverse ANSI/IEEE 28.2 2
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12.2 IDMT Curves
12.2.1 IEC Curves
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12.2.2 RI Curves
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12.2.3 IEEE/ANSI CURVES
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12.3 Thermal overload curves
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