ABB RELION Series - Frequency Measurement FMMXU

8.1.8 Frequency measurement FMMXU
8.1.8.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Frequency measurement FMMXU F F
8.1.8.2 Function block
GUID-5CCF8F8C-E1F4-421B-8BE9-C0620F7446A7 V2 EN
Figure 299: Function block
8.1.8.3 Functionality
The frequency measurement range is 35...75 Hz. The estimated frequencies outside
the measurement range are considered to be out of range and the minimum and
maximum values are then shown.
When the frequencies cannot be measured, for example, due to too low voltage
amplitude, the default value for frequency measurement can be selected with the Def
frequency Sel setting parameter. In the “Nominal” mode the frequency is set to 50 Hz
(or 60 Hz) and in “Zero” mode the frequency is set to zero and shown in parentheses.
8.1.8.4 Signals
Table 595: FMMXU Input signals
Name
Type Default Description
F SIGNAL - Measured system frequency
8.1.8.5 Settings
Table 596: FMMXU Non group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Operation 1=on
5=off
1=on Operation Off / On
F high high limit 35.00...75.00 Hz 1 60.00 High alarm frequency limit
F high limit 35.00...75.00 Hz 1 55.00 High warning frequency limit
F low limit 35.00...75.00 Hz 1 45.00 Low warning frequency limit
F low low limit 35.00...75.00 Hz 1 40.00 Low alarm frequency limit
F deadband 100...100000 1 1000 Deadband configuration value for integral
calculation (percentage of difference
between min and max as 0,001 % s)
Section 8 1MRS758755 A
Measurement functions
574 REC615 and RER615
Technical Manual