Woodward LS-5 v2 Series - Breaker Feedback Security Procedure; Introduction

LS-5x2
System A
System B
A05
CAN bus
MCB Control
Current (3Ph)
Voltage (3Ph)
Voltage (3Ph)
GGB Control
Current (1Ph)
LOAD
Dis./Analog Inputs
GCB Control
Current (3Ph)
MPU/ECU
Voltage (3Ph)
Engine Start/Stop
Voltage (1Ph)
A12
easYgen-3000
Dis./Analog Inputs
GCB Control
Current (3Ph)
MPU/ECU
Voltage (3Ph)
Engine Start/Stop
Voltage (1Ph)
A12
easYgen-3000
Dis./Analog Inputs
GCB Control
Current (3Ph)
MPU/ECU
Voltage (3Ph)
Engine Start/Stop
Voltage (1Ph)
A12
easYgen-3000
Voltage (3Ph)
Fig. 159: Multiple easYgen-3500XT with one LS-5x2 (example)
6.6
Breaker Feedback Security Procedure
6.6.1
Introduction
You can ignore this chapter
• if the application does not allow dead busbar closure by LS-5 con󰈡guration
• if the breakers are mechanically interlocked.
A breaker constellation 'CBA/CBB' which consists of two independent physical breakers
can be secured against unsynchronized closure.
Due to the fact that the LS-5x1 always measures the voltage at both sides of its breaker,
the decision for dead busbar closure is done by the breaker feedbacks and the voltages.
The LS-5x2 does not measure the load busbar and relies only on the breaker feedbacks of
CBA and CBB to decide, whether a breaker must be synchronized or can be closed
directly. So for example if the CBA is open and the dead busbar closure CBB is enabled,
the CBB will be closed onto the dead load busbar.
292 LS-5 v2 Series 37650
6 Application
6.6 Breaker Feedback Security Procedure
Released