Functional block diagram of the S24/F relay
General presentation
The S24/F relay is a multifunction digital relay mainly used for the protection of feeders and incomers (lines or cables) of any kind. It also provides protection for asynchronous motors. It consists of a three-phase and earth current unit.
It belongs to the S24 family, part of the SMARTLINE range. These devices offer a wide set of functions in a compact housing. Among other uses, they are particularly suited to the LV compartments of MV switchgear cubicles.
The particularity of these relays is that, although they belong to the SMARTLINE range, their hardware and firmware are the same as those of the relays making up the PROTECTA range. They therefore share the same physical and electrical characteristics. This provides extensive field experience of their use and operation, as well as consistent and optimum manufacturing lead times. The main difference between the two ranges is the housing.
The EuroCAP configuration tool, available free of charge, provides a user-friendly and flexible application for protection, control and measurement functions, ensuring that the protection devices are fully customisable.
General features
- Native IEC 61850, Edition 2 compatible
- Standard 144 × 144 mm housing
- The predefined factory configuration can be customised to the user’s specifications with the EuroCAP tool
- Various types of HMI:
- Colour touch screen
- Monochrome (B&W) alphanumeric display with 4 touch buttons.
- Built-in web server as well as extended measurement, control and monitoring functions.
- User-configurable LCD displays for the colour touch HMI, able to show single line diagrams with position indication and control of the switching devices, as well as measurement values of the controllable objects
- Adaptive protection
- Circuit breaker monitoring and control
- High-capacity disturbance recorder (DRE) and event logging:
- DRE supporting up to 32 analogue signal channels and 64 digital signal channels
- The event recorder can store more than 10,000 events
- Various mounting types:
- Flush-mounted;
- Semi-flush-mounted;
- DIN rail
- 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
- Legacy network protocols over 100Base-FX and 10/100Base-TX (RJ45)
- Optional communication ports:
- Ethernet over optical fibre (MM/ST, SM/FC),
- RJ45,
- POF serial,
- Serial over optical fibre,
- RS-485/422
- Simultaneous support of several communication protocols
- Built-in self-monitoring function (hardware and software) – Watchdog
- Various time sources available:
- NTP server;
- IRIG B
Applications
The S24/F relay is a multifunction digital relay. Its full set of functionalities allows it to be used on a line or cable incomer or feeder, or on a motor feeder.
This protection includes various versatile protection functions for incomers and feeders of any kind (line, cable, transformer, motor), such as three-phase and residual overcurrent protection.
For motors, it more specifically integrates negative sequence component monitoring, undercurrent detection, motor thermal image, etc.
It can nevertheless be used as a back-up protection relay for downstream equipment (for example distribution lines and cables).
The auto-reclosing function is also part of the standard configuration. The relay integrates a wide range of control and supervision functions, providing full control and user-defined interlocking schemes for the substation switchgear.
Field of application
- Three-phase and residual overcurrent protection functions for overhead lines and cables
- Additional motor protection and supervision functions: thermal overload, negative sequence components, undercurrent protection, start-up supervision
- The protection functions implemented provide back-up protection for downstream equipment (for example distribution lines, cables, etc.)
- Optional capacitor bank protection functions (capacitor unbalance, capacitor overvoltage)
- Auto-reclosing function
- Circuit breaker failure protection function
- Inrush current detection
- Current transformer (CT) current unbalance detection
- Programmable interlocking schemes
Protection and control functions
The S24/F (V1) configuration measures the three phase currents as well as the residual current. The main protection functions are the overcurrent protection functions, the thermal overload protection function and the undercurrent protection function. For motor protection, it integrates a start-up supervision function with restart blocking. Capacitor protection functions are optional. This configuration is designed to meet the requirements of a medium voltage substation.
General documentation : FDE 19AA1121500A1 S24_En
Operation manual : S24F OMA 23AA3351234
Click on the link to access the technical documentation to attach to your order : DOCACOM_S24
