Functional block diagram of the DTRV/T3 relay
General presentation
The DTRV/T3 relay is an intelligent electronic device (IED) for protection and control dedicated to three-winding transformers; this relay offers complex protection, control and monitoring functions for three-winding power transformers. This device belongs to the DTRV product family within the PROTECTA range. In both hardware and software terms, this range is based on a modular architecture. Thanks to this architecture, the modules are assembled and configured according to the user’s needs; from then on, the software determines the functions (SFB).
The DTRV relays are specially designed for the protection and control of power transformers. In addition, the DTRV family integrates a wealth of versatile protection functions to meet the most demanding user requirements. Thanks to its built-in control, measurement and monitoring functions, the IED can also be used as a bay control unit.
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 DTRV/T3 relay is designed to act as the main intelligent electronic device (IED) for protection and control of three-winding power transformers. This relay belongs to the DTRV family within the PROTECTA range.
The DTRV/T3 IED offers a varied range of versatile protection functions in addition to the transformer differential protection, such as three-phase, Io and I² overcurrent protection, thermal overload protection, restricted earth fault (REF) or earth differential protection (87N) against earth faults (low or high impedance option), etc. It can be used as a back-up protection relay for downstream equipment (for example distribution lines and cables).
The DTRV/T3 transformer protection relay supports two-circuit-breaker schemes on each side of the transformer, such as breaker-and-a-half or ring bus topologies.
The relay integrates a wide range of control and supervision functions, providing full control and user-defined interlocking schemes for the switchgear of the transformer substation.
Field of application
- Protection and control device for three-winding transformers, including a main transformer differential protection and several additional protection functions
- The protection functions implemented provide back-up protection for downstream equipment (for example distribution lines, cables, etc.).
- Protection for all types of power transformers (including autotransformers)
- Single-phase/three-phase tripping and support for two-circuit-breaker schemes, such as breaker-and-a-half or ring bus topologies
- Three-phase transformer differential protection:
- Automatic compensation of the phase shift and transformation ratio of the transformer.
- 2nd and 5th harmonic restraint for inrush current and transformer overexcitation detection
- Earth differential protection against earth faults (restricted earth fault)
- Current transformer (CT) current unbalance detection
- Programmable interlocking schemes
- Optional units:
- Remote I/O unit (RIO)
- Transducer I/O (RTD/mA)
- Underimpedance protection
Protection and control functions
The DTRV/T3 device measures the three phase currents as well as the residual current (image of the zero sequence current) on both sides of a three-phase three-winding transformer. The main protection functions are the transformer differential protection and the restricted earth fault protection against earth faults. The additional protection functions can provide back-up protection for downstream equipment (for example distribution lines and cables).
Click on the link to download the general documentation : Please contact our Sales Department
Technical sheet : NC_DTRV
Operation manual : DTRV_T3_FDE20GJ0791356A1
Click on the link to access the technical documentation to attach to your order : DOCACOM_PROTECTA
