Frequency Measurement Fmmxu - ABB RELION Series Technical Manual

Section 8
Measurement functions
8.1.8
8.1.8.1
8.1.8.2
8.1.8.3
8.1.8.4
8.1.8.5
Table 596: FMMXU Non group settings (Basic)
Parameter
Operation
F high high limit
F high limit
F low limit
F low low limit
F deadband
574

Frequency measurement FMMXU

Identification
Function description
Frequency measurement
Function block
GUID-5CCF8F8C-E1F4-421B-8BE9-C0620F7446A7 V2 EN
Figure 299: Function block
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.
Signals
Table 595: FMMXU Input signals
Name
F
Settings
Values (Range) Unit
1=on
5=off
35.00...75.00 Hz
35.00...75.00 Hz
35.00...75.00 Hz
35.00...75.00 Hz
100...100000
IEC 61850
identification
FMMXU
Type Default Description
SIGNAL - Measured system frequency
Step Default
1=on
1 60.00
1 55.00
1 45.00
1 40.00
1 1000
1MRS758755 A
IEC 60617 ANSI/IEEE C37.2
identification device number
F F
Description
Operation Off / On
High alarm frequency limit
High warning frequency limit
Low warning frequency limit
Low alarm frequency limit
Deadband configuration value for integral
calculation (percentage of difference
between min and max as 0,001 % s)
REC615 and RER615
Technical Manual