2
TB MRF3 04.01 E
Contents
1 Introduction and application
2 Features and characteristics
3 Design
3.1
Connections
3.1.1 Analog input circuits
3.1.2 Output relays
3.1.3 Blocking input
3.1.4 External reset input
3.1.5 Fault recorder
3.1.6 Parameter settings
3.2
LEDs
4 Working principle
4.1
Analog circuits
4.2
Digital part
4.3
Principle of frequency supervision
4.4
Measurement of the frequency gradient
(rate of change of frequency)
4.4.1 Load shedding
5 Operation and settings
5.1
Display
5.2
Setting procedure
5.3
System parameter
5.3.1 Display of voltage U as primary quantity
(U
prim
/U
sek
)
5.3.2 Setting of nominal frequency
5.3.3 Display of the activation storage
(FLSH/NOFL)
5.4
Protection parameters
5.4.1 Parameter switch
5.4.2 Number of measuring repetitions(T)
5.4.3 Threshold of frequency supervision
5.4.4 Tripping delays for the frequency elements
5.4.5 Disengaging value for the frequency stages
with mains stabilisation
5.4.6 Reclaim time upon mains stabilisation
5.4.7 Parameter for frequency gradient
supervision df/dt at load shedding
5.4.8 Parameters for frequency gradient
supervision df/dt for mains decoupling
5.4.9 Blocking for frequency measuring
5.4.10 Voltage threshold for frequency
measurement
5.4.11 Adjustment of the slave address
5.4.12 Setting of Baud-rate (applies for Modbus
Protocol only)
5.4.13 Setting of parity (applies for Modbus
Protocol only)
5.5
Parameter for the fault recorder
5.5.1 Adjustment of the fault recorder
5.5.2 Type of fault recorder
5.5.3 Number of the fault recordings
5.5.4 Adjustment of trigger occurences
5.5.5 Pre-trigger time (T
pre
)
5.6
Date and time
5.6.1 Adjustment of the clock
5.7
Additional functions
5.7.1 Setting procedure for blocking the
protection functions
5.8
Measuring values
5.8.1 Instantaneous values
5.8.2 Tripping memory
5.8.3 Display of measuring values
5.8.4 Unit of the measuring values displayed
5.8.5 Minimum and maximum values
5.9
Fault memory
5.9.1 Reset
5.10
Dynamic behaviour of the relay functions
6 Relay testing and commissioning
6.1
Power-on
6.2
Testing the output relays
6.3
Checking the set values
6.4
Secondary injection test
6.4.1 Test equipment
6.4.2 Test circuit
6.4.3 Checking the input circuits and measuring
values
6.4.4 Checking of operating- and resetting
values of the over-/underfrequency func-
tions
6.4.5 Checking of operating- and resetting
values of the df/dt elements
6.4.6 Checking the tripping delays
6.4.7 Checking the reclaim time of the
frequency stages
6.4.8 Checking the external blocking- and reset
functions
6.5
Primary injection test
6.6
Maintenance
7 Technical Data
7.1
Measuring input circuits
7.2
Common data
7.3
Setting ranges and steps
7.4
Order form
For additional common data of all MR-relays please
refer to manual “MR-Digital Multifunctional Relays”.
This manual is valid for software version D01-6.00.
Summary of Contents for MRF3
Page 1: ...MRF3 Frequency Relay...
