Simulated Input Behaviour; Testing Examples; Figure 202: Simulated Input Behaviour - GE P4A Technical Manual

Micom p40 agile single br eaker multi-end current differential ied (non distance)
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P54A/B/C/E
SV Test Mode Setting
Disabled
Enabled
9.2

SIMULATED INPUT BEHAVIOUR

Simulated GOOSE messages and sampled value streams can be used during testing.
The Subscriber Sim setting in the COMMISSION TESTS column controls whether a device listens to simulated
signals or to real ones. An IEC 61850 control service to System/LPHD.Sim can also be used to change this value.
The device may be presented with both real signals and test signals. An internal state machine is used to control
how the device switches between signals:
The IED will continue subscribing to the 'real' GOOSE1 (in green) until it receives the first simulated GOOSE 1
(in red). This will initiate subscription changeover.
After changeover to this new state, the IED will continue to subscribe to the simulated GOOSE 1 message (in
red). Even if this simulated GOOSE 1 message disappears, the real GOOSE 1 message (in green) will still not
be processed. This means all Virtual Inputs derived from the GOOSE 1 message will go to their default state.
The only way to bring the IED out of this state is to set the Subscriber Sim setting back to False. The IED will
then immediately stop processing the simulated messages and start processing real messages again.
During above steps, IED1 will continuously process the real GOOSE 2 and GOOSE 3 messages as normal
because it has not received any simulated messages for these that would initiate a changeover.
The process is represented in the following figure:
Simulated GOOSE 1 messages
Simulation bit goes TRUE
Real GOOSE 1 messages
Simulation bit was FALSE
Real GOOSE 2 messages
Real GOOSE 3 messages
V01058

Figure 202: Simulated input behaviour

9.3

TESTING EXAMPLES

These examples show how you test the IED with and without simulated values. Depending on the IED Test Mode, it
may respond by operating plant (for example by tripping the circuit breaker) or it may not operate plant.
P54xMED-TM-EN-1
Normal IED behaviour
All sampled value data frames received with an IEC 61850 Test quality bit set
are treated as invalid
The IED will display the measurement values for sampled values with the
Simulated flag set but the protection elements within the IED will be blocked
All sampled value data frames received are treated as good, no matter if they
have an IEC 61850-9-2 Simulated flag set or not
LPHD1
Sim stVal=true
Reception buffer
Chapter 20 - Commissioning Instructions
Result
Beh stVal=on
Incoming data
processed
471

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