The table below provides an overview and description of the PPU-2 options and shows which options that
can be converted to PPU-3. PPU-2 options B1 and C1 are implemented as standard software in PPU-3.
PPU-2
Description
PPU-3
Option type
Option A1
Vector jump and df/dt (ROCOF)
Option A1
Software
Over-/under-voltage (generator and busbar)
Over-/under-frequency (generator and busbar)
Time-dependent under-voltage
Reactive power-dependent under-voltage
Option A2
Df/dt (ROCOF)
Over-/under-voltage (generator and busbar)
Over-/under-frequency (generator and busbar)
Option A1
Software
Option A3
Vector jump
Over-/under-voltage (generator and busbar)
Over-/under-frequency (generator and busbar)
Option A1
Software
N/A
Positive sequence voltage low
Option A4
N/A
Directional over-current
Option A5
Option B1
Over-/under-voltage (generator and busbar)
Over-/under-frequency (generator and busbar)
Standard
Software
Option C1
Over-/under-voltage (generator)
Over-/under-frequency (generator)
Overload
Fast over-current (<42 ms, 350 %, 2 levels)
Current/voltage unbalance
Reactive power import (excitation loss)
Reactive power export (over-excitation)
Standard
Software
Option C2
Negative seq. voltage/current
Zero seq. voltage/current
Option C2
Software
Power-dependent reactive power import/export
Inverse time over-current
Option D1 (PPU/
GPU)
Fixed U/Q/PF
Q load sharing
Option D1
Software
Voltage droop
GPU: voltage matching (requires option G2)
Option E1
+/-20 mA for speed governor
+/-20 mA for AVR
N/A
Hardware
Option EF2
+/-20 mA for speed governor
1 × 0(4) 20 mA transducer output
N/A
Hardware
Option EF3
1 × PWM (Pulse Width Modulated) output for
CAT speed governor
1 × PWM (Pulse Width Modulated) output for
droop
+/-20 mA for speed governor or AVR
2 × relay outputs for speed governor or AVR
N/A
Hardware
ML-2 application notes Converting PPU-2
to PPU-3 4189341126 UK
Application and installation
DEIF A/S
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