American SEL-351S Integrated Protection Device
LEHIY item code: LH-SEL-0012
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SEL-351S Integrated Protection Device, sourced directly from the US SEL manufacturer. Genuine SEL 351S microprocessor-based protection device, SEL-351S Protection System. We offer remote or on-site installation and commissioning services for SEL products.
The SEL-351S protection device provides comprehensive feeder and overcurrent protection, ideal for industrial and utility feeder applications. Improve your service quality with lower costs and innovative such features as Mirrored Bits communication, IEEE C37.118 synchronous phasors, extended operator control, and SEL's Best Choice Ground Directional Element logic.
Complete distribution system protection—applies a comprehensive combination of overcurrent functions, providing sensitive protection against phase-to-phase and phase-to-ground faults, and enabling rapid action on three-phase faults.
Reclosing control—programs the relay's four-times automatic reclosing function using synchronization and voltage check logic to simulate various reclosing practices. Sequential coordination logic coordinates with downstream reclosing to form a complete protection scheme.
Fast Substation Restoration – Automated substation restoration schemes are commissioned using a programmable user interface control and Mirrored Bits communication, along with the SEL-2100 logic processor.
Reliable Circuit Breaker Control – Circuit breakers are manually opened or closed using optional SafeLock trip/close buttons, providing direct control of circuit breakers independent of relays.
The SEL-351S microprocessor-based protection device is summarized below: Protection Aspects: Innovative Directional Element Polarization provides directional stability during phase faults through positive sequence voltage polarization memory of the phase directional element.
Best Choice Ground Directional Element system logic ensures safe operation of the ground directional element for all types of system grounding practices under various system conditions. Frequency Protection provides advanced load unloading through six-level frequency elements and four frequency change rate elements, as well as undervoltage/overvoltage protection.
Reclosing Control employs four-stage reclosing with sequential coordination, synchronization checks, and voltage checks. Fault Locator uses an impedance-based fault locator to calculate accurate fault distance measurements. Second Harmonic Blocking Detection – Transformer energization is monitored by the second harmonic blocking element.
The output of the harmonic detection element blocks the selected tripping element until the surge condition subsides. The Fast Dropout Breaker Failure Element and local circuit breaker fault logic enhance circuit breaker fault detection.
In terms of communications: The IEC 61850 communication protocol applies optional IEC 61850 communication to the SEL-351S protection system to ensure the performance of substation automation and control. The acSELerator Architect SEL-5032 software simplifies the configuration of IEC 61850-compliant relays.
Mirrored Bits Communications Technology provides fast and reliable trunk-to-trunk communication for advanced communication-assisted protection, network reconfiguration, pilot protection, and recovery schemes. Modbus, DNP3, and ASCII protocols are easily integrated into new or existing networks using these popular protocols.
Supervisory Control and Data Acquisition (SCADA) links, local human-machine interfaces (HMIs), and dial-in modems can access critical relay data. The Simple Network Time Protocol (SNTP) simplifies cabling and installation by receiving time signals over existing Ethernet networks.
SNTP provides an excellent backup for more accurate IRIG-B time synchronization.
Its 5-millisecond accuracy is ideal for basic time synchronization across the entire substation. For monitoring and metering: Enhanced circuit breaker monitoring checks reports on recent tripping and closing times and average operating times, or collects trend data from up to 128 previous operations.
This information allows for timely and economical scheduling of circuit breaker maintenance. Metering and power quality (PQ) monitoring eliminates the need for external instruments (MW, MVAR, MWh, MVARh, power factor (PF), RMS, and instantaneous/peak demand) through accurate metering. Harmonic metering of the 16th harmonic simplifies PQ analysis.
Optional PQ monitoring records voltage dips, swells, and interruptions. A built-in web server provides access to basic trunk information on standard Ethernet. View relay status, Sequence Event Recorder (SER) data, metering information, and settings for easy access within the local network. Upgrade firmware via existing Ethernet connections.
Web server access requires a trunk password. Our company has a strong advantage in supplying the American SEL-351S integrated protection device. We source directly from the American SEL manufacturer, guaranteeing authenticity. For product details regarding the SEL-351S integrated protection device, please contact our sales department.
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| Brand Name: | SEL | Certification: | ISO9001, CE |
|---|---|---|---|
| Place of Origin: | China | Condition: | New |
| Warranty: | 1 year | Customized sourcing: | available |
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American SEL-351S Integrated Protection Device
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