Dsg Industries Khar, Mumbai, Maharashtra

The SIPROTEC 7SA522 relay provides full-scheme distance protection and incorporates all functions usually required for the protection of a power line. The relay is designed to provide fast and selective fault clearance on transmission and subtransmission cables and overhead lines with or without series capacitor compensation. The power system star point can be solid or resistance grounded (earthed), resonant-earthed via Peterson coil or isolated. The SIPROTEC 7SA522 is suitable for single-pole and three-pole tripping applications with and without tele (pilot) protection schemes.The SIPROTEC 7SA522 incorporates several protective functions usually required for transmission line protection.High-speed tripping timeSuitable for cables and overhead lines with or without series capacitor compensationSelf-setting power swing detection for power swing frequencies up to 7 HzDigital relay-to-relay communication for two and three terminal topologiesAdaptive auto-reclosure (ADT)

The SIPROTEC 6MD61 enables in a simple, easy way to enhance the number of binary inputs and outputs in the switchgear. It can be used directly in the bay together with other SIPROTEC4 units and also together with SICAM PAS to serve as a central process connection.The IO-Box is based on the SIPROTEC 6MD63 and 6MD66 series, so it can be easily integrated in systems with other SIPROTEC 4 units.The IO-Box supports a wide range of demand for additional binary inputs (BI) and binary outputs (BO), starting from 20 BI+10 BO and going up to 80 BI+53 BO. All important standard communication protocols are supported. With IEC 61850-GOOSE communication, a direct information interchange with other SIPROTEC units is possible. For simplification and cost reduction, the IO-Box is available only without automation (CFC), without keypad and without display.

The SEL-387 Current Differential and Overcurrent Relay provides protection, control, and metering for transformers, buses, breakers, and feeders. Features include four three-phase current inputs with independent restrained and unrestrained differential protection, programmable single- or dual-slope differential characteristic, circuit breaker monitor, battery voltage monitor, and enhanced SELogic control equations.

The SIPROTEC 7SC80 feeder protection can be used for protection and automation of medium voltage distribution feeders with grounded or low resistance grounded, isolated, or compensated neutral point.The 7SC80 features flexible protection functions. 20 additional protection functions can be created by the user. For example, a rate of change of frequency function or a reverse power function can be created. The relay provides circuit-breaker control.Additional primary switching devices (grounding switches, transfer switches and isolating switches) can also be controlled from the relay. Automation or PLC logic functionality is also implemented in the device. The integrated programmable logic (CFC) allows the user to add own functions, e.g. for the automation of switchgear (including: interlocking, transfer and load shedding schemes). The user is also allowed to generate user-defined messages. The upgrade of device and communication firmware is also possible via Ethernet.HighlightsSupport of feeder automation applications, e.g. fault isolation and service restaurationDesigned for harsh environmentExtended temperature range 50 C up to 85 COpen for all different communication technologies, e.g. radio, which are used for feeder automationIntegrated GPS module is available for time synchronisationFull remote access supported for firmware and parameter updates and upgradesA web based HMI provides complete remote control of the device9 programmable function keys6-line displayIntegrated switch for low-cost and redundant optical rings. Devices can be connected directly with each other at electrical modulesParallel running communication protocolsRedundancy protocols RSTP, PRP and HSR for highest availabilityCurrent Jump detectorExtended CFC capabilities24 km Single mode interfaceRTU version without protection featuresSecondary current transformers values (1 A / 5 A9 settable using DIGSIBuffer battery exchangeable from the sideUSB front portRelay-to-relay communication through Ethernet with IEC 61850 GOOSEStainless steel housingMillisecond-accurate time synchronization through Ethernet with SNTPInputs for Low power CTs and VTs according IEC 61869-6 (formerly IEC 60044-7 and IEC 60044-8)

Auxiliary relay and Trip Relay is an electro-mechanical relay that operates on attracted armature principal designed to IEC60255. Auxiliary relay is available in 3 NO contacts and 2 CO contacts with self reset contacts type with or without flag. Trip relay low burden is available in 3 NO and 3 NC contacts. Trip relay high burden is available in 3 NO and 2 NC contacts with hand reset contacts type. Auxiliary Relay and Trip Relay is used in high speed operation which suits the requirements like transmission and industrial applications