ABB Relion REG670, Applications Manual

Page: 735 / 780

23.10.1 Application
The Signal matrix for mA inputs function SMMI is used within the Application
Configuration tool in direct relation with the Signal Matrix tool. SMMI represents the
way milliamp (mA) inputs are brought in for one IED configuration.
23.10.2 Setting guidelines
There are no setting parameters for the Signal matrix for mA inputs SMMI available
to the user in the Parameter Setting tool. However, the user must give a name to SMMI
instance and SMMI inputs, directly in the Application Configuration tool.
23.11 Signal matrix for analog inputs SMAI
23.11.1 Application
Signal matrix for analog inputs (SMAI), also known as the preprocessor function
block, analyses the connected four analog signals (three phases and neutral) and
calculates all relevant information from them like the phasor magnitude, phase angle,
frequency, true RMS value, harmonics, sequence components and so on. This
information is then used by the respective functions connected to this SMAI block in
ACT (for example protection, measurement or monitoring functions).
23.11.2 Frequency values
The SMAI function includes a functionality based on the level of positive sequence
voltage,
MinValFreqMeas , to validate if the frequency measurement is valid or not. If
the positive sequence voltage is lower than MinValFreqMeas , the function freezes the
frequency output value for 500 ms and after that the frequency output is set to the
nominal value. A signal is available for the SMAI function to prevent operation due
to non-valid frequency values.
MinValFreqMeas is set as % of UBase /√3
If SMAI setting ConnectionType is Ph-Ph , at least two of the inputs GRPxL1,
GRPxL2 and GRPxL3, where 1≤x≤12, must be connected in order to calculate the
positive sequence voltage. Note that phase to phase inputs shall always be connected
as follows: L1-L2 to GRPxL1, L2-L3 to GRPxL2, L3-L1 to GRPxL3. If SMAI setting
ConnectionType is Ph-N , all three inputs GRPxL1, GRPxL2 and GRPxL3 must be
connected in order to calculate the positive sequence voltage.
If only one phase-phase voltage is available and SMAI setting ConnectionType is Ph-
Ph , the user is advised to connect two (not three) of the inputs GRPxL1, GRPxL2 and
GRPxL3 to the same voltage input as shown in figure 342 to make SMAI calculate a
positive sequence voltage.
1MRK 502 071-UEN -
Section 23
Basic IED functions
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 729
Application manual