Siemens Solkor 7PG2113 Technical Manual page 221

directional boundaries in the opposite (lag) direction. The recorded angle should be the angle at which the
phase current leads the phase-phase polarising voltage. This measurement is greatly simplified if the
polarising reference voltage is set to 0deg and the current phase angle is measured with respect to this
reference.
Alternatively, the instrument can be checked at the 4 points marked a,b,c & d on Figure 2-1 only.
Lag (point C)
Pick-up
MTA MTA-85
Phase A
Phase B
Phase C
Figure 2.2-1 Directional Phase Fault Boundary System Angles
5. With the instrument reading 'Fwd' or 'Rev', reduce the voltage until the element resets. Record the minimum
phase-phase operate voltage.
Minimum Voltage Setting
©2012 Siemens Protection Devices Limited
Forward
Lead (point A)
Drop-off Pick-up Drop-off
MTA+85
Table 2.2-3 Directional Limits Test Results
Table 2.2-4 Minimum polarising Voltage Results
7PG2113/4/5/6 Commissioning & Maintenance
Lead(point B)
Pick-up Drop-off
MTA-85
Measured
Reverse
Lag (point D)
Pick-up Drop-off
MTA-85
Chapter 6 Page 23 of 77