Application Areas - Siemens 3UG4 User Manual

3UG4.1 line monitoring relay

6.1 Application areas

6.1 Application areas
Application areas
The various line monitoring relays are used, for example, in non-stationary systems such as
refrigeration containers, construction site compressors, and cranes. The devices are used in
the following application areas:
Table 6- 1
Function
Phase sequence
Phase failure
Phase asymmetry
Undervoltage
Overvoltage
102
Application areas of the line monitoring relays
Application
Direction of rotation of the drive
•
Refrigeration trucks
•
Refrigerators
•
Saws
•
Pumps
•
Rollers
•
Transport of persons (elevators, moving staircases and walkways)
•
A fuse has tripped
•
Control supply voltage failure
•
Cable break
•
Crane systems
•
Electrical welding
•
Emergency generating sets (banks, hospitals, alarm systems, power
•
plants)
Transport of persons (elevators, moving staircases and walkways)
•
Motor protection (overheating of the motor through asymmetric voltage)
•
Detection of asymmetric systems
•
Increased current on a motor with corresponding overheating
•
Unintended device reset
•
Mains failure – particularly with battery supply
•
Heating systems
•
Cranes
•
Elevators
•
Protection on unstable systems (switchover to emergency current,
•
monitoring of the generator)
System protection against destruction caused by supply overvoltages
•
Energy supply to the line
•
Lamps (UV lamps, laser lamps, OP lighting, tunnels, traffic lights)
•
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004