Functional block diagram of the DGEN/2 relays
General presentation
The DGEN/2 family (formerly DTRV/T(G)) consists of three complete multifunction protections for generators and generator-transformer units
- DGEN/2: rotating machine protection
- DGEN/2T: generator and unit transformer protection
- DGEN/2TS: generator, unit transformer protection and automatic synchroniser
These relays of the PROTECTA range perform complex protection, control and monitoring functions for generator / step-up transformer units. The complex protection of this range, in both hardware and software terms, is based on a modular device. Thanks to this modular architecture, the modules are assembled and configured according to the user’s needs; from then on, the software determines the functions.
The DGEN family is specially designed for the protection and control of power transformers and generators, including generator-transformer units. It also integrates a wide range of versatile protection functions to meet the most demanding user requirements.
The EuroCAP configuration software, available free of charge, provides a user-friendly and flexible application for protection, control and measurement functions, allowing the use of fully customisable devices.
General features
- Native intelligent electronic device (IED) compliant with the IEC 61850 standard, Edition 2 compatible
- Scalable hardware adapting to different applications
- Rack width of 84TE or 42TE (height: 3U)
- The predefined factory configuration can be customised to the user’s specifications with the powerful EuroCAP tool
- Flexible protection and control functionalities to meet specific user requirements
- Advanced HMI functionalities via a colour touch screen and a built-in web server, extended measurement, control and monitoring functions
- User-configurable LCD displays, able to show single line diagrams (SLD) with switchgear position indication and control, as well as measurement values and several types of controllable objects.
- Various protection setting groups available
- Enhanced circuit breaker monitoring and control
- High-capacity disturbance recorder (DRE) and event logging (data stored in non-volatile memory):
- DRE supporting up to 32 analogue signal channels and 64 digital signal channels.
- The event recorder can store more than 10,000 events.
- Several mounting methods: rack-mounted; flush-mounted; semi-flush-mounted; wall-mounted; wall-mounted with terminals; flush-mounted with IP54-rated cover.
- Wide range of communication protocols
- Ethernet communication: IEC 61850; IEC 60870-5-104; DNP3.0 TCP; Modbus TCP
- Serial communication: DNP3.0; IEC 60870-5-101/103; MODBUS, SPA
- The PROTECTA range can handle several communication protocols simultaneously.
- Built-in self-monitoring function to detect internal hardware or software errors.
- Various time sources available: NTP server; minute pulse; legacy protocol master; IRIG-B000 or IRIG-B12X
Applications
The DGEN/2 devices are designed to act as the main intelligent electronic device (IED) for protection and control of synchronous generators or complete generator units, including the step-up transformer.
The DGEN/2 relays integrate various versatile protection functions in addition to the main differential protection, such as overcurrent, overvoltage/undervoltage and frequency protection. The devices also integrate several functions specially designed for generator applications, for example protection against heating caused by current unbalance, voltage-dependent overcurrent protection (voltage-controlled overcurrent), inadvertent energisation protection, loss of excitation, 100% stator earth fault protection, rotor earth fault protection, etc. It can be used as a back-up protection relay for downstream equipment (for example feeders, cables, etc.).
The DGEN/2T generator (unit) protection relay supports two-circuit-breaker configurations. A synchroniser function is available on the DGEN/2TS relay.
These protection devices integrate a wide range of control and supervision functions allowing full control and the implementation of user-defined interlocking schemes for the primary switchgear of the substation.
Field of application
- Three-arm unit differential protection
- Automatic compensation of the phase shift and transformation ratio of the step-up transformer
- 2nd and 5th harmonic restraint for inrush current and transformer overexcitation detection
- The auxiliary transformer CTs can be placed on the primary or on the secondary side
- Automatic synchroniser
- Synchronism check (synchrocheck) and management of the synchronising commands (synchroswitch) sent to the voltage and frequency regulators.
- User-configurable triggering/cancellation conditions
- Protection functions specially designed for generator protection
- Voltage-dependent overcurrent protection
- Inter-turn fault protection for high power generators (current- or voltage-based, depending on the winding)
- Loss of excitation protection
- Pole slipping or loss of synchronism protection (phase shift)
- Rotor earth fault protection for insulated/unearthed or centrally earthed rotors
- Various types of stator earth fault protection (95%):
- Residual overcurrent (can be sensitive depending on the current transformer)
- Residual overvoltage
- Restricted earth fault
- Stator earth fault protection (100%):
- 3rd harmonic undervoltage
- 3rd harmonic differential overvoltage, by measuring the residual voltage at the neutral and at the connection point (two operating modes if a generator circuit breaker is present)
- Restricted earth fault protection
- The protection functions implemented provide back-up protection for downstream equipment (for example feeders, cables, etc.).
- Independent tripping logic and circuit supervision for each tripping circuit (circuit breaker, excitation, turbine valve, etc.)
- Support for two-circuit-breaker substations, such as breaker-and-a-half or ring bus topologies
- Current and voltage transformer supervision
- Programmable closing schemes
- Optional external unit:
- Remote I/O unit (RIO)
- Optional transducer I/O (RTD/mA)
Protection and control functions
All DGEN/2 configurations measure the three-phase currents of the three arms (generator neutral side, outgoing busbar side and primary or secondary of the auxiliary transformer), the residual current(s), the three-phase generator voltages, the residual voltage(s) as well as the busbar voltage. The main protection functions are the unit differential protection, the automatic generator synchroniser, overcurrent protection, voltage-dependent overcurrent protection, frequency protection, loss of excitation protection and earth fault protection. Additional protection functions are available to provide the level of complexity required by the generator protection needs, as well as back-up protection for downstream equipment (for example distribution lines, cables, etc.).
Click on the link to download the general documentation : Please contact our Sales Department
Technical sheet : DGEN2 NCA 25MJ0632156 en
Click on the link to download the operation manual : Please contact our Sales Department
Click on the link to access the technical documentation to attach to your order : DOCACOM_PROTECTA
