SEL feeder protection relay SEL-751 series in stock in the United States

Introduction to the functions of the SEL feeder protection relay SEL-751 series in the United States

Feedline protection - equipped with comprehensive protection functions including inverse time overcurrent, directional overcurrent, automatic reclosing, overvoltage/low voltage, frequency, second and fifth harmonic blocking, optional low-energy analog (LEA) voltage input, IEC cable/line thermistor, islanding effect detection, and others, can protect radial and circular distribution circuits.

Sensitive neutral point input - using a 200mA neutral point current input option, utilizing directional control function to protect high resistance grounded, ungrounded, and arc suppression coil grounded systems. The 200mA neutral point current input option can also be used for directional SER protection function.

Arc light detection - equipped with optional arc light detection capabilities to improve personnel safety. The SEL-751 provides a combination of light intensity and high-speed overcurrent detection for arc events, offering an ideal solution that is fast and safe.

High impedance fault detection - using arc light sensing technology (AST), can detect broken wires, even for surfaces with poor contact. The AST algorithm can detect arc flash caused by some high impedance faults and can be used for alarm or circuit breaker tripping. This technology provides an additional layer of protection for traditional feeder protection methods.

Automation and Control - The SEL-751 can be applied to feeders and provide both protective automation and control functions.

Event Analysis - SEL-751 provides detailed event records for more effective post event analysis. Effectively combining waveform and digital information is beneficial for identifying the root cause. By adding satellite synchronous clock sources such as SEL-2401, SEL-2407, or SEL-2488, it is easy to align event information from multiple devices.

State cognition - Utilizing IEEE C37.118 synchronous phasor measurement can enhance state cognition and asset utilization.

Reliability in harsh environments - Even in harsh and hazardous environments, the SEL-751 can provide reliable protection and control applications. The design and testing of SEL-751 meet and exceed utility and industrial standards. Operating temperature range from -40 ° C to+85 ° C (-40 ° F to+185 ° F); Level 1 and Zone 2 permits; The optional conformal coating means that the relay can provide years of reliable service.

Fault location - Fault location algorithm can quickly detect faults and restore services. By using serial port or Ethernet communication and SCADA protocol, fault location information can be automatically sent to the control center.

Detailed information of SEL feeder protection relay SEL-751 in the United States:

Function Overview Options Firmware

Complete feeder protection

Optional directional control

Optimize the radiation and ring network protection of lines and equipment using overcurrent components with directional control. *Grounding directional component logic, optimizing directional component performance, eliminating numerous directional settings. The relay also supports high impedance grounding, ungrounded, and arc suppression coil grounding systems through a 200 mA neutral point current transformer (CT) option. The 200 mA CT option can also be used for directional SEF protection.

Optional protection features

The SEL-751 with voltage input and isolated light detection options can provide synchronous detection, DC monitoring, and arc light detection. The SEL-751 supports option cards with 4 or 8 arc protection inputs. Optional Low Energy Analog (LEA) voltage input (8 Vrms for phase and synchronous voltages) supports pedestal mounted voltage sensors and other compact devices.

Thermistor element

Use IEC circuit/cable thermal sensitive (49) components to protect cables and cable insulation from thermal damage.

Optional vector offset

When there is a loss of large capacity power generation, islanding effects can be detected by detecting voltage angle offsets to prevent damage to local power generation.

Optional high impedance fault detection

The SEL-751 with AST function can detect numerous high impedance faults, such as wire breakage. Alarm or trip for low fault current and faults that cannot be detected by conventional relays.

Optional touch screen display

The touch screen provides a single line diagram simulation display for controlling and monitoring interval units. View measurement quantities, phasor diagrams, relay settings, event summaries, target states, Sequential Event Recorder (SER) data, and more. Extensive testing has shown that robust capacitive touchscreen displays meet or exceed industry standards as well as SEL quality and reliability requirements.

Convenient control

The eight programmable buttons on the front panel's three color LED allow for quick and personalized control.

Simple communication

Choose from Ethernet or serial communication and multiple protocols, including IEC 60870-5-103, mirrored bit communication, and IEC 61850. Choose multiple sessions from Modbus TCP, serial Modbus, DNP3 LAN/WAN, or DNP3 serial port to customize the configuration for your application. When dual Ethernet ports are selected, the relay also supports IEC 62439 Parallel Redundancy Protocol (PRP) and fast fault switching.

IEC 61850 communication protocol

The SEL-751, which combines IEC 61850 technology and Ethernet network, has the fastest overall performance of IEC 61850 relays and is used for substation automation and control. Using acSELerator Architect SEL-5032 software, the configuration for enabling IEC 61850 relays has been streamlined. The use of password authentication and session timeout features improves security. Transfer event files, CID files, settings, and reports in COMTRADE and CEV formats.

Simple Network Time Protocol (SNTP)

Receive time signals through existing Ethernet networks to simplify wiring and installation. SNTP can serve as a backup for more accurate IRIG-B clock synchronization. 5ms accuracy can be used as the basic clock synchronization for substations.

Built in IEEE C37.118 synchronous phasor

Monitor the distribution network and detect potential voltage breakdowns in advance. IEEE C37.118 synchronous phasor, capable of up to 60 messages per second, allows access to system values for wide area monitoring. The IEEE C37.118 standard simplifies communication and data coordination between synchronous phasor measurement units.

Extended SELogic Control Equations

Customize applications using mathematical and logical combinations of analog and digital quantities. Adaptive system control based on pre fault conditions. Proportional analog quantities and transient inputs of latches are used as SCADA retrieval conditions.

Enhance the safety of heavy-duty feeders

Equipped with load intrusion logic, the phase overcurrent component can be set to be independent of the load level.

Durable design

According to the industry's widest operating temperature range, from -40 ° C to+85 ° C (-40 ° C to+185 ° F).

Easy installation

By utilizing existing retrofit kits and installation adapters, the SEL-751 can be easily installed in its current location without the need for cutting or punching.

Flexible design

Multiple installation and integration options, compact chassis, and push in expansion plugins.

Product Certification

The SEL-751 feeder protection relay is an ideal choice for applications such as directional overcurrent, fault location, arc detection, and high impedance fault detection. With flexible I/O options, convenient installation, and quick calibration, the SEL-751 is the correct solution for feeder protection in industrial and power utility fields. The SEL-751 provides complete feeder protection, including overcurrent, overvoltage, low voltage, directional power, thermal protection for IEC cables/lines, vector offset, sensitive earth fault (SEF), load intrusion, and frequency components. Choose the 5-inch, 800 × 480 color touchscreen display option to directly set up, monitor, and control your system. It can be easily upgraded for protection without the need to cut or drill holes on the original opening, with a compact box and multiple installation adapters. Having IEC 61850 (2nd edition), IEC 60870-5-103, IEC 62439 Parallel Redundancy Protocol (PRP), Mirrored Bits mirrored bit communication Modbus、DNP3、 And other protocols that can be quickly integrated with serial or Ethernet based communication.

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Norgren, UK

Italy OMAL, Italy ATOS, Italy CAMOZZI, Italy UNIVER, Italy CAMOZZI