add docu on scaling of voltages and currents

Signed-off-by: Jan Dinkelbach <[email protected]>

docs/hugo/content/en/docs/Development/Guidelines.md

@@ -5,6 +5,20 @@ linkTitle: "Guidelines"
 
 This is a summary of general guidelines for the development of DPsim.
 
+## Scaling of Voltages and Currents
+
+Voltage quantities are expressed either as phase-to-phase RMS values (denominated as `RMS3PH`) or as phase-to-ground peak values (denominated as `PEAK1PH`):
+
+- Initialisation quantities (e.g. `initialSingleVoltage` of `SimPowerComp`) as `RMS3PH` values
+- Simulation quantities in both `SP` and `DP` domain (e.g. `mIntfVoltage` of `DP::Ph1::PiLine`) as `RMS3PH values`
+- Simulation quantities in the `EMT` domain (e.g. `mIntfVoltage` of `EMT::Ph3::Transformer`) as `PEAK1PH` values
+
+Current quantities are expressed either as `RMS` or as `PEAK` values:
+
+- Simulation quantities in both `SP` and `DP` domain (e.g. `mIntfCurrent` of `DP::Ph1::PiLine`) as `RMS` values
+- Simulation quantities in the `EMT` domain (e.g. `mIntfCurrent` of `EMT::Ph3::Transformer`) as `PEAK` values
+
+
 ## Logging
 
 Debug or trace should be the default log level for information that might be nice to have but not necessary for every simulation case.
@@ -23,4 +37,4 @@ A new version of DPsim has to be indicated as follows:
 - Update sonar-project.properties
 
 Due to the creation of a new tag, a new PyPi package will be deployed automatically.
-To release an updated Docker image, the container workflow needs to be triggered manually.
+To release an updated Docker image, the container workflow needs to be triggered manually.