Multilin 750/760

Date: Nov 29, 2024 Views: 871

　　Feeder protection system

　　The 750/760 Feeder Protection System is a digital relay intended for the management and primary protection and control of distribution feeders. This easy to use relay provides comprehensive protection functions for feeders and back up protection for bus, transformers and transmission lines in a draw out construction and at a reduced product life cycle cost.

　　Key Benefits

　　Easy to use Feeder Protection System supported by industry leading suite of software tools

　　• Accurate built-in metering functions - Eliminates auxiliary metering devices and reduces cost

　　• Improve uptime of auxiliary equipment - I/O monitoring

　　• Reduce troubleshooting time and maintenance costs - IRIG-B time synchronization, event reports, waveform capture, data logger

　　• Minimize replacement time - Draw-out construction

　　• Simplify testing - Built in simulation features

　　• Cost effective access to information. Supports industry protocols such as DNP & Modbus. Includes an optional 10MB Ethernet port for system integration

　　• Complete asset monitoring - Analog I/O, Full metering including demand & energy

　　• Leading edge technology - Flash memory for product field upgrade

　　• Extended life - Optional conformal coating for chemically corrosive and humid environments

　　• Globally accepted ensuring adherence to international codes and standards

　　Applications

　　• Primary protection and control for distribution feeders on solidly grounded, high impedance grounded or resonant (Peterson Coil) grounded systems

　　• Bus blocking/Interlocking schemes

　　• High-speed fault detection for arc flash mitigation

　　• Throw over schemes (bus transfer scheme applications)

　　• Load shedding schemes based on voltage and frequency elements

　　• Back-up protection for transmission lines, feeders and transformers

　　• Distributed Generation (DG) interconnect protection

　　Protection and Control

　　The 750/760 Feeder Protection System is a digital relay intended for the management and primary protection and control of distribution feeders. This easy to use relay provides comprehensive protection functions for feeders and back up protection for bus, transformers and transmission lines at a reduced product life cycle cost.

　　Time & Instantaneous Overcurrent

　　The 750/760 has two phase TOC elements with level detectors for each phase. The 750/760 also has two overcurrent elements most commonly used for primary and back up protection. Each TOC element has the following programmable

　　characteristics:

　　• Pickup current level for trip, alarm, or control

　　• Choice of 15 curve shapes (including FlexCurves) and curve multipliers

　　• Instantaneous or linear reset time characteristic

　　• Voltage restraint

　　The 750/760 has two phase IOC elements with level detectors for each phase. Each IOC element has a programmable pickup current, a time delay during which current must exceed the pickup for operation, and the minimum number of phases required for operation.

　　Solidly grounded and low impedance grounded distribution systems requiring fast clearing of ground faults to limit equipment damage. The following functions are incorporated in the 750/760 to provide ground fault protection

　　• Neutral IOC and TOC

　　• Ground IOC and TOC

　　750/760 allows directional elements to be used to supervise the ground overcurrent protection

　　Communications

　　The 750/760 is equipped with three standard serial communications ports, one RS232 located in the front panel, and two RS485/RS422 in the rear of the relay. A rear Ethernet port is also available as an optional feature. The front panel port allows easy local computer access. The rear ports provide remote communications or connection to a DCS, SCADA, or PLC. The baud rate of all the serial ports is variable from 300 to 19,200 bps. The optional Ethernet port can be used to connect the 750/760 to 10 Mbps Ethernet networks. The 750/760 supports ModBus® RTU, DNP3.0 Level 2, and ModBus RTU TCP/IP protocols.

　　The three serial ports support ModBus RTU protocol, while any one of the two rear ports but not both can be configured to support DNP 3.0 Level 2. The optional Ethernet port supports ModBus RTU via TCP/IP protocol. The communication system of the 750/760 is designed to allow simultaneous communication via all ports.

　　Using Ethernet as the physical media to integrate the 750/760 to Local or Wide Area Networks, replaces a multidrop-wired network (e.g., serial Modbus®), and eliminates expensive leased or dial-up connections, reducing monthly operating costs.

　　Access Security

　　The 750/760 can be protected against unauthorized setpoint changes. A key switch may be installed on the rear terminals to allow setpoint changes from the front panel. An optional passcode restricts setpoint changes from both the front panel and ports.

　　EnerVista Software

　　The EnerVista™ Suite is an industry-leading set of software programs that simplifies every aspect of using the 750/760 relay. The EnerVista™ suite provides all the tools to monitor the status of your protected asset, maintain the relay, and integrate information measured by the 750 into DCS or SCADA monitoring systems.

　　Convenient COMTRADE and Sequence of Events viewers are an integral part of the 750 Setup software included with every 750 relay, to carry out postmortem event analysis to ensure proper protection system operation.

　　EnerVista Launchpad

　　EnerVista™ Launchpad is a powerful software package that provides users with all of the setup and support tools needed for configuring and maintaining Multilin products. The setup software within Launchpad allows configuring devices in real-time by using serial, Ethernet, or modem connections, or offline by creating setting files to be sent to devices at a later time. Included in Launchpad is a document archiving and management system that ensures critical documentation is up-to-date and available when needed. Documents made available include:

　　• Manuals

　　• Application Notes

　　• Guideform Specifications

　　• Brochures

　　• Wiring Diagrams

　　• FAQ’s

　　• Service Bulletins

　　Retrofit Existing Multilin SR 750 Devices in Minutes

　　Traditionally, retrofitting or upgrading an existing relay has been a challenging and time consuming task often requiring re-engineering, panel modifications, and re-wiring. The Multilin 8 Series Retrofit Kit provides a quick, 3-step solution to upgrade previously installed Multilin SR 750/760 protection relays, reducing upgrade costs. With the new 8 Series Retrofit Kit, users are able to install a new 850 Feeder Management System without modifying existing panel or switchgear cutouts, re-wiring, or need for drawing changes and re-engineering time and cost.

　　With this three-step process, operators are able to upgrade existing SR relays in as fast as 21 minutes, simplifying maintenance procedures and reducing system downtime.

750760_gea31955.pdf

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