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SEG Electronics GmbH develops and manufactures intelligent protection devices for power generation and distribution. With our solutions and products, we shape tomorrow’s intelligent energy supply and contribute to the energy transition.
Our portfolio of easy to operate, while robust and reliable protection relays can be used for the electrical protection of generators, transformers, motors, cables, and overhead lines, as well as busbars.
Whether standardized products or customer-specific developments – the solutions provided by our employees have been top of class all over the world for more than 50 years.
MRU4 Voltage Protection
- The MRU4 is a protection relay which uses the latest Dual-Core-Processor Technology to provide precise and reliable protective functions and is very easy to operate.
- It is designed to protect electrical equipment from dangerous voltage fluctuations.
- For example protection against under voltages caused by mains shortcircuits, or overvoltages due to load shedding or failure of a generator voltage controller.
- Its compact design makes the MRU4 ideal for installation within the LV terminal compartments of compact SF6-insulated MV systems.
- The protection functions of the MRU4 have been adapted to comply with the requirements of the VDE-AR-N-4110:2018.
Functional Overview
Features
Wide range power supply: 24…270 VDC / 48…230VAC
VT measurement from 0 V up to 800 VAC
Plausibility verification intelligence
Optimized functional overview by hiding unused functions, parameter and assignments
On-board testing without removing the wiring
Menu Languages Supported: English, German, Spanish, Portuguese, French, Russian, Polish, Romanian
Applications
- Interconnection of renewable energies (DER – Distributed Energy Resources) to the public grid
- Over / Undervoltage protection
- Protection of high, medium and low voltage feeders against overvoltage (insulation damage) and undervoltage
- Frequency based protection option. Examples: Over / underfrequency supervision, load shedding by ROCOF
- Neutral Voltage displacement(NVD)
MRR1 Rotor Earth Fault Relay
The generator rotor protection relay MRR1 combines rotor earth fault protection, excitation overand undercurrent protection as well as rotating diode failure protection. Thus providing a powerful protection regarding the rotor of synchronous generators, covering the following ANSI codes:
- 37 DC undercurrent relay
- 40 Field relay
- 58 Rectification failure relay
- 64 Ground detector relay
- 76 DC over current relay
The MRR1 is recommended for synchronous generators and motors above 1 MVA rating. The rotor earth fault element detects high and low resistance earth faults of the rotor winding.
It is equipped with two stages, one for alarm, one for trip. The excitation current protection element supervises the DC excitation current of brushless excitor machines.
The protective functions are: undercurrent, overcurrent and ripple detection for diode failure protection.
Features
19“ racks – fully withdrawable
Door mounting – withdrawable and sealable
Panel mounting – fully withdrawable
Fault / disturbance recorder
Intuitive HMI
Display (of primary values)
Easy setting software smart view
Compact form factor
Applications
Protection of electrical (HV, MV) synchronous generators against:
- Underexcitation damages (field failure protection, ANSI / IEEE C37.2: 40)
- Stator earth fault / insulation damages
- Rotor earth fault detection
XR1 Rotor Earth Fault Relay
The relay XR1 of the easy PROFESSIONAL LINE is used for detection of rotor earth faults in synchronous machines. The earth fault element detects high and low impedance earth faults in rotor windings and is in two stage design (for alarm and trip).
Functional Overview
Features
Fast DIN rail mounting ⇛ easy and fast mounting
Sealable plastic covers ⇛ safe (see if anybody has broken the seal)
Super easy settings via front buttons ⇛ fast without computer
LED and output relays fault indication ⇛ easy to find out what has happened
Compact form factor ⇛ fits in small spaces
IT security ⇛ no way to attack via Ethernet
Robust and reliable ⇛ well proven reliable quality
Wide range power supply ⇛ don’t worry about available supply voltage
Integrated self-test procedure (via button) ⇛ fast and easy checks: relays, LEDs
Applications
Protection of electrical (HV, MV) synchronous generators against:
- Underexcitation damages
- Rotor earth fault detection
