Application Guide
P12y/EN AP/D32
MiCOM P125/P126 & P127
Page 69/74
9. MEASUREMENTS
The measurement functions on MiCOM P125, P126 and P127 relays are described in
chapter User Guide of this Technical Guide.
Particular attention is to be given to the power and energy measurement.
9.1
Power and Energy Measurements (P127)
The MiCOM P127 relay provides the measurements function for active and reactive power
and for active and reactive energy.
The value for power is calculated in accordance with the following listed table.
VTs connection
Active Reactive power calculation method
3Vpn
Sum of each power phase
P= PA+PB+PC
Q=
QA+QB+QC
2Vpn+Vr
Sum of each power phase
P= PA+PB+PC
Q=
QA+QB+QC
2Vpp+Vr Aron
insertion
The value for energy is calculated by multiplying the calculated power value by time.
The calculated energy value is stored in a non-volatile memory (E²PROM) every second, so
that in case of temporary power supply fault, the previous values calculated can be recalled.
The MiCOM P127 relay provides, on the display, the measurements of the power and of the
energy. Both refer to primary values and rely on the CT and VT ratio.
The maximum active and reactive power value displayed is 9999MW and 9999MVAr.
The maximum active and reactive energy value displayed is 4200GWh and 4200GVArh.
The sign of the active and reactive power/energy values is taken according to the diagram
below.
They are in accordance with the wiring diagrams in the chapter P12y/EN CO in this
Technical Guide.
V
I
+
cos phi
cos phi
-cos phi
-cos phi
+P
+P
-Q
+Q
-P
-Q
+Q
-P
P0100ENa
Summary of Contents for MiCOM P125
Page 1: ...MiCOM P125 P126 P127 Directional Non directional Relay Technical Guide P12Y EN T E32...
Page 2: ......
Page 4: ...P12y EN T E32 Technical Guide Page 2 2 MiCOM P125 P126 P127 BLANK PAGE...
Page 5: ...Pxxxx EN SS B11 SAFETY SECTION...
Page 6: ......
Page 8: ...Pxxxx EN SS B11 Page 2 10 Safety Section BLANK PAGE...
Page 16: ...Pxxxx EN SS B11 Page 10 10 Safety Section BLANK PAGE...
Page 17: ...Getting Started P12y EN GS D32 MiCOM P125 P126 P127 GETTING STARTED...
Page 18: ......
Page 66: ...P12y EN GS D32 Getting Started Page 48 48 MiCOM P125 P126 P127 BLANK PAGE...
Page 68: ......
Page 79: ...User Guide P12y EN FT D32 MiCOM P125 P126 P127 USER GUIDE...
Page 80: ......
Page 166: ...P12y EN FT D32 User Guide Page 86 86 MiCOM P125 P126 P127 BLANK PAGE...
Page 167: ...Technical Data P12y EN TD D32 MiCOM P125 P126 P127 TECHNICAL DATA AND CHARACTERISTIC CURVES...
Page 168: ......
Page 197: ...Application Guide P12y EN AP D32 MiCOM P125 P126 P127 APPLICATION GUIDE...
Page 198: ......
Page 202: ...P12y EN AP D32 Application Guide Page 4 74 MiCOM P125 P126 P127 BLANK PAGE...
Page 274: ......
Page 298: ...P12y EN CM C22 Commissioning and Maintenance Page 24 24 MiCOM P125 P126 P127 BLANK PAGE...
Page 300: ......
Page 302: ...P12y EN CO C22 Connections and Wiring Diagrams Page 2 10 MiCOM P125 P126 P127 BLANK PAGE...
Page 310: ...P12y EN CO C22 Connections and Wiring Diagrams Page 10 10 MiCOM P125 P126 P127 BLANK PAGE...
Page 312: ......
Page 360: ...P12y EN RS D32 Commissioning Test and Record Sheet Page 48 48 MiCOM P125 P126 P127 BLANK PAGE...
Page 361: ......