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Grid monitoring
The PRO-33.0-TL inverter monitors the grid conditions with internal measurements. The
measured values are compared against the limits set in the parameter group
monitoring. If the measured value does not stay within the limit for a certain minimum
period of time, the inverter declares the grid as unstable. All grid monitoring settings are
reset when the country code is changed.
Notes:
•
If the grid monitoring settings are changed, do a parameter refresh with the parameter
188.05
Refresh.
•
Depending on the installation country, an external third party-certified grid monitoring
relay may be needed.
Nominal values
Note: The fault ride-through settings must be taken into account when defining grid
monitoring.
The inverter monitors either line-to-line voltages or line-to-neutral voltages. This is
selected with the parameter
respectively. The settings for grid monitoring are set in relation to the nominal value.
Settings
188.02 Nominal LL voltage
188.03 Nominal phase voltage
188.04 Nominal frequency
188.06 Voltage source
Connection delays
Typically, it is required that the grid must be stable for some time before grid connection is
allowed. For this purpose there is a set of delays.
•
188.10 Initial connection delay
connection after a power-up can be made.
•
188.11 Reconnection delay
before the following reconnection.
•
188.13 Quick reconnection delay
defined in parameter
a faster reconnection. If the parameter
reconnection is not used.
Settings
188.10 Initial connection delay
188.11 Reconnection delay
188.12 Quick disturbance limit
188.13 Quick reconnection delay
188.06 Voltage source
defines the delay that must expire before the first grid
defines the delay that must expire after a disconnection
is used if the grid is unstable for less than the value
188.12 Quick disturbance
188.12 Quick disturbance limit
Program features 19
that can be set to Main or Phase,
limit. Thus a short unstable grid allows
188 Grid
is set to 0, quick
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