New Features: –


➤ A new front-panel layout option with a 5-inch, color, 800 x 480-pixel touchscreen interface to navigate the

screens, folders, and applications. The new touchscreen display layout allows bay control. You can also view

metered quantities and perform HMI functions including viewing and editing settings, event summaries,

target status, SER, etc. This option is available with four or eight pushbuttons, with or without a fiber-optic

serial port, or with or without ac voltage inputs.

➤ Added an ac currents only model (no voltages) that can be configured with four pushbuttons, four ac current

inputs, and without a fiber-optic serial port.

➤ Increased the maximum number of GOOSE subscriptions to 64.


Major Features and Benefits: –

The SEL-751 Feeder Protection Relay provides a comprehensive combination of protection, fault-locating features,

monitoring, control, and communication in an industrial package.

Standard Protection Features. Protect lines and equipment with an extensive range of protection elements,

including overcurrent elements, over- and underfrequency elements, rate-of-change-of-frequency and fast

rate-of-change-of-frequency elements, definite-time and inverse-time over- and undervoltage elements,

directional power elements, second- and fifth-harmonic current blocking (inrush blocking), load encroachment, demand metering elements, and breaker failure protection. Implement load shedding and other control schemes with under- and overfrequency elements, under- and overvoltage elements, and powerful SELOGIC® control equations. Also protect and control equipment with cable or line thermal elements that conform to the IEC 60255-149 standard and with vector shift elements that aid in islanding detection.

Optional Directional Control. Use overcurrent elements with directional control to optimize radial and

looped network protection for lines and equipment. Best Choice Ground Directional Element® logic optimizes directional element performance and eliminates the need for many directional settings.

Optional High-Impedance Fault Detection. Use the high-impedance fault (HIF) detection element to

operate for small current ground faults typically resulting from downed conductors on ground surfaces such as

earth, reinforced concrete, or other poorly conductive materials. HIF event data are available in COMTRADE

or Compressed ASCII format.

Optional Arc-Flash Protection. Reduce or eliminate damage from arc-flash events with the optional four- or

eight-channel fiber-optic arc-flash detector inputs and protection elements. Settable arc-flash phase and neutral overcurrent elements combined with arc-flash light detection elements provide secure, reliable, and

fast arc-flash event protection.

Optional Low-Energy Analog (LEA) Voltage Inputs. Measure voltages as low as 8 Vac rms.

Optional Synchronism Check and DC Station Battery Monitor. Check single-phase voltage across a

circuit breaker; measure dc voltage levels in the substation battery.

Operator Controls and Reclosing. Trip and close the breaker easily with eight programmable front-panel

pushbuttons, each with two tricolor LEDs. Implement remote and local control functions, and selectively

reclose with synchronism and voltage checks.

Relay and Logic Settings Software. Reduce engineering costs by using ACSELERATOR QuickSet®

SEL-5030 Software for relay settings and logic programming. Tools in QuickSet make it easy to develop SELOGIC control equations.

Metering and Monitoring. Use built-in metering functions to eliminate separately mounted metering

devices. Analyze Sequential Events Recorder (SER) reports and oscillography event reports for rapid commissioning, testing, and post-fault diagnostics. Unsolicited SER protocol allows station-wide collection

of binary SER messages.

Fault Location. Reduce fault location and repair time with built-in impedance-based fault location and

faulted phase indication.

Wye or Delta Voltage Inputs. Connect voltage inputs that are wye-connected, open-delta-connected, or

single voltage.

Additional Standard Features. Improve your feeder protection with these additional standard features in

every SEL-751: Modbus RTU; Event Messenger support and MIRRORED BITS® communications; load profile

and breaker wear monitoring; support for 12 external RTDs (SEL-2600); IRIG-B input; advanced SELOGIC;

and IEEE C37.118-compliant synchro phasor protocol to provide real-time measurement data.

Additional Optional Features. Select from a wide offering of other optional features, including IEC 61850

Edition 2; IEC-60870-5-103; DNP3 serial and LAN/WAN; Modbus TCP/IP; Simple Network Time Protocol (SNTP); parallel redundancy protocol (PRP) with dual Ethernet ports; ten internal RTDs; expanded digital/ analog I/O; additional EIA-232 or EIA-485 communications ports; and single or dual, copper-wire or fiberoptic Ethernet ports, and an ac currents only model (no voltages) with no fiber-optic serial port and four programmable pushbuttons.

Supported Languages. Multiple language support with English and Spanish options.

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