SEL distributor, SEL microcomputer protection device, SEL integrated protection relay
LEHIY item code: LH-SEL-0026
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Our company is an authorized distributor of SEL products, including SEL microprocessor-based protection devices and SEL integrated protection relays. These are widely used in power equipment such as substations, transformer rooms, hydropower stations, pumping station systems, and industrial automation power protection systems.
We can provide remote or on-site installation and commissioning services for SEL products.
SEL USA has authorized our company to mainly deal in: SEL microprocessor-based protection devices, SEL integrated protection many electromagnetic user equipment uses older SEL models, but SEL USA has upgraded all its products, making them generally reliable replacements.
SEL microprocessor-based protection devices offer comprehensive generator protection—the SEL-700G generator protection relay can be used with large, medium, and small generators to provide complete protection for both main and standby generators.
The SEL-700GT provides a generator grid-connection protection solution compliant with IEEE 1547 for distributed generation.
Adding a neutral point voltage connection provides 100% stator grounding protection based on third harmonic voltage measurements. Connecting a neutral current input provides protection for machines with direct grounding or resistive grounding. Automatic synchronization—replaces external generator control and synchronizer relays with the built-in automatic synchronizer function.
Generator frequency, voltage, and phase control functions enable automatic grid-connection with the power system. The generator synchronization process is monitored using generator start-up reports and a PC synchronization oscilloscope.
Current differential protection—protects the generator and step-up transformer with sensitive ratio-controlled current differential elements and instantaneous differential trip elements, as well as synchronization checks and overexcitation detection (V/Hz). Optional current differential elements detect stator faults with safe and sensitive current differential functionality.
Power transformer and CT connection compensation allows the step-up transformer to be included in the generator's differential protection zone.
Circuit Breaker Wear Monitoring – Utilizes the circuit breaker's monitoring capabilities to record cumulative wear on circuit breaker contacts, leveraging manufacturer specifications to define the circuit breaker's operating limits.
Internal monitoring records the total number of closing/opening operations and integrates discontinuous current for each phase. An alarm is set to alert the operator when measured and cumulative counts approach maintenance thresholds. This information facilitates proactive circuit breaker maintenance and replacement, preventing wasted resources.
Easy Communication – Choose from single- or double-strand copper wire or fiber optic Ethernet ports, or serial communication devices, and select from multiple protocols, including Mirrored Bits communication and IEC. 61850. Select multiple Modbus TCP or Modbus continuous sessions to customize your application configuration.
Utilize DNP3 serial or DNP3 LAN/WAN protocols.
Scope of Application for Monitoring Systems: ◆ Substation Integrated Automation System ◆ Distribution Room Integrated Automation System ◆ Pumping Station Integrated Automation System ◆ Hydropower Station Integrated Automation System ◆ Industrial/Factory Automation System ◆ Other Automatic Control Systems SEL Microcomputer Protection Device Introduction (Original Manufacturer, USA): SEL microcomputer protection.
and control devices utilize advanced DSP and surface mount technology, along with flexible fieldbus (CAN) technology, to meet the requirements of different voltage levels in substations, achieving coordinated, digital, and intelligent substation operation.
The products adopt distributed protection and control devices, which can be centrally panelized or distributed, and the configuration can be arbitrarily changed according to user needs to meet different scheme requirements.
SEL microcomputer protection devices are suitable for protection, monitoring, and measurement of voltage levels of 110KV and below, and can be used for line, transformer, capacitor, motor, busbar PT detection, standby power supply automatic transfer circuit, and main equipment protection, control, and monitoring.
Its modular design allows for easy integration into primary equipment and centralized panel deployment and control. The standardized fieldbus interface supports coordinated operation of multiple nodes, enabling system-level management and comprehensive information sharing.
With advancements in science and technology and increasingly demanding environmental protection requirements, the functionality of microprocessor-based protection devices is becoming increasingly sophisticated.
General-purpose microprocessor-based integrated protection devices can be used for the protection and control of various electrical equipment and lines in ungrounded systems, low-resistance grounded systems, arc-suppression coil grounded systems, and directly grounded systems at voltage levels of 35KV and below.
They can also be used for the protection and control of voltage and current in some 66KV and 110KV systems. SEL Microprocessor-based Protection Device and SEL Integrated Protection System Introduction: The SEL microprocessor-based protection device is an economical protection system integrating measurement, control, protection, and communication.
Tailor-made for high-voltage distribution rooms in distribution networks, it features three-stage omnidirectional current protection as its core, equipped with grid parameter monitoring and acquisition functions.
It eliminates the need for traditional ammeters, voltmeters, wattmeters, frequency meters, and electricity meters, and can remotely transmit measurement data and protection information to a host computer via a communication port, facilitating distribution network automation.
Based on the characteristics of distribution network power supply, the device integrates a backup power automatic transfer function, flexibly realizing incoming line backup and busbar backup functions.
The SEL-700G uses a traditional neutral point overvoltage element with third harmonic voltage difference detection for stator grounding fault detection in high-resistance grounded generators. The optional current differential protection element detects stator faults through safe and sensitive current differential function.
Power transformer and CT connection compensation allows the step-up transformer to be included in the generator's differential protection zone. Power element-sensitive components protect against reverse power, overload conditions, or forward low power.
The RTD-based thermal protection uses an internal 10 RTD input card or an external SEL-2600 RTD module for SEL-700G alarm, monitoring, and trip functions. It collects temperature data for measurement and reporting.
The American SEL-787 microprocessor-based protection device can be selected according to drawings to view generator automatic synchronizer, Continuous Event Recorder (SER), and 180-cycle oscilloscope event reports, analyzing generator startup, shutdown, or system faults. It measures electrical, thermal, and generator operating parameters.
Synchronization phasor data utilizes SEL synchronization phasors (IEEE C37.118) to convert state estimates into state measurements and early issue four digital inputs (DI) and four fast high-current interrupt digital outputs (DO); Four digital outputs (DO), three digital inputs (DI), and one analog output (AO); Four digital inputs (DI).
and three digital outputs (DO) (two Type C and one Type B); inputs.
Two AC voltage inputs; Current differential protection; Integrated communication; The SEL-700G offers a variety of communication media and protocol options. These versatile communication options enable rapid integration into new and existing applications.
Communication media: Ethernet 10/100BASE-T, Ethernet 100BASE-FX; Single or dual Ethernet ports EIA-232; Serial EIA-485; Serial communication protocol IEC 61850; DNP3 LAN/WAN DNP3; Serial Modbus TCP net FTP IEEE C37.118; Synchronous phasor retrofit kits: Replace existing feeder protection with SEL-700G and applicable mounting.
kits.
These kits provide the parts needed to easily replace many older feeder relays using SEL-700G. Install SELector with SEL; explore other mounting options. Conformal coating protects SEL equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.
Authorized distributor of SEL microprocessor protection device SEL-551 0551COCX132X from the USA. High-resolution product photos available. Original SEL products from the USA.
SEL-2730 SEL2730M0ARAC1111AAAAX0 SEL-2241 SEL2241X01323X0XXXXXX SEL-2242 SEL2242R1X0 SEL-2244 SEL22442525X0 SEL-487B-1 SEL0487B1X6X52XC1XG37RRXXX SEL-411L SEL0411L1X6X5C6CCX3425XXXX SEL-551 SEL0551006X152X SEL-551 SEL0551006X152X SEL-551 SEL055100CX632X SEL-578Z SEL0587Z0X115H22XX SEL-351 SELX1 replaces 0351S6X3A4E15X2 SEL-751A SEL751A01D1D3D72810300 SEL-751A SEL751A01G3G0X0X81 SEL-787 SEL0787EX1D1D1D71810300 SEL-300G SEL0300G00H421XX32XX SEL-487B.
SEL0487B1X6X12XB1XDH9DDDX SEL-411L SEL0411L1X6X1C6EEX36D52525 SEL-421 SEL04215611XC0C5361X1XXX SEL-2506 SEL250604515X SEL-2523 SEL252301310A0G1XX SEL-311C SEL0311C00324255X1 Update 0311C103H4E55X1 KEY:7085 SEL-250 SEL2505425XX SEL-0551 SEL0551C0CX13 SEL-0551 SEL0551C0CX13 SEL-0551 SEL0551003X532X SEL-0351A SEL0351A00324565XX SEL-0351A SEL0351A00324565XX 0351A030X4E65X1 SEL-710 SEL071050E1DCD1D74831210 SEL-710 SEL071001G1G9X71810831 SEL-710 SEL071002B1B9X71860000 SEL-749M.
SEL0749M01G602X1G10 SEL-751A SEL751A01G1G72810100 SEL-751A SEL751A01G1G0X72850100 SEL-751A SEL751A01D1D3D72810300 SEL-751A SEL751A01DCD1D74830210 SEL-751A SEL751A01G1G73860600 SEL-751A SEL751A62BCB3B74840820 SEL-751A SEL751A01G1G3G73810100 SEL-751A SEL751A01G1G1G72811310 SEL-751A 751A11GCGOX71860100 SEL-751A 751001ACA3A70850611 SEL-751A 751A01G1G0X0X810200 SEL-751A 751A01G3G1G71811630 SEL-751A 751A11A1A3A75850830 SEL-751A 751A01G1G3G72860100 SEL-787 07870X1G1G3G0X850310 SEL-787 07870X1G1G0X0X810100.
SEL-787 7871X1D1D1DA1810210 SEL-787 0787EX1D1D1D7180210 SEL-787 0787EX1D1D1D71810300 SEL787 07871X1G1G1GA1810630 SEL-787 07870CX1G1G0X0X850600 SEL-551 0551006X1X2X?
SEL-048 0487B065X1XGGGGGH SEL-587 058710C2132 SEL-351 0351513462XX SEL-751A 751A01D1D3D72810300 SEL-2241 2241X01323X0XXXXXX SEL-2242 2242R1X0 SEL-2244 22442525X0 SEL-2244 22443131X0 SEL-487B-1 0487B1X6X52XC1XG37RRXXX SEL-411L 0411L1X6X5C6CCX3425XXXX SEL-2411 241121D1D1D71850640 SEL-2032 203233X40XG0G0 SEL-351 035154A154X1 SEL-787 07871X1D1D1DA1810210 SEL-787 0787EX1D1D1D71810300 SEL-300G 0300G00H421XX32XX.
SEL-487B 0487B1X6X12XB1XDH9DDDDX SEL-351 X1 replaces 0351S6X3A4E15X2 SEL-751A 751A01G3G0X0X81 SEL-411L 0411L1X6X1C6EEX36D52525 SEL-421 04215611XC0C5361X1XXX SEL-2506 250604515X SEL-2523 252301310A0G1XX SEL-3533 3533xxxxx1323xxxxxxxx SEL-2407 24070A133 SEL-2730 2730M0ARAC1111AAAAX0 SEL Transformer Differential Protection SEL058710CX5X1 SEL Transformer High Backup Protection SEL055100CX5X1X SEL Transformer Low Backup Protection SEL0351A00H24555XX discontinued,.
upgraded to replace 0351A0H2X4E55X1 SEL-351A 0351A032X4E15X2 SEL Microcomputer Protection Device 0587006X131 American SEL Microcomputer Protection Device SEL-551C P/N:0551COCX132X American SEL Relay Protection Device SEL-501-2 050120CX15232B SEL-551, P/N: 0551003X531X SEL-351A 0351A032X3E54X1 SEL-857 058710C2131 1 unit SEL-3530 35303A2XX211X0XXXXXX 1 unit American.
SEL Microcomputer Protection Devices: SEL-351: 03515134E152X1 1 unit SEL-387: 0387514X5H2X3X1 1 unit SEL-551: 0551003X5X1X 1 unit SEL-351A:0351A00324553X1 1 unit; SEL-351A:0351A032X4E65X1 2 units; SEL-551:055100CX632X 2 units; SEL-749M:0749M01G502X1G10 4 units; SEL-587:058710C25X2 1 unit; procurement, and after-sales commissioning and.
installation services, Please contact me!
Plain language sourcing guide for SEL distributor, SEL microcomputer protection device, SEL integrated protection relay
Start with the full model name. Check the brand name. Check the part number. Check the code on the old unit. These small checks help you avoid a wrong order.
Take one clear photo of the front label. Take one photo of the side label. If the part has a cable, plug, port, seal, coil, or screen, take a photo of that area too.
Tell us the quantity you need. Tell us your country. Tell us the date when the plant needs the part. We can then check stock, lead time, safe packing, and the best shipping plan.
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Use simple order notes. Write the model in one line. Write the quantity in one line. Write the delivery country in one line. This helps our team reply faster.
Check the old part before removal. Look at the label. Look at the connector. Look at the mounting size. Look at the voltage or pressure rating if it is shown.
Do not rely on a short nickname for a part. Many industrial items have close versions. A small suffix can change the plug, output, range, or software setting.
Ask for a stock check if the plant is stopped. Ask for a lead time if the order is planned. Ask for packing photos if the part is fragile or heavy.
For a replacement order, tell us what failed. Tell us where the part is used. Tell us if an equal model is acceptable. This makes the first answer more useful.
For repeat orders, send the last invoice, old label, or old packing photo. The same reference can help us match the correct product again.
For urgent service, keep the message simple. One model, one quantity, one photo, and one delivery target are enough for a fast first check.
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| Brand Name: | SEL | Certification: | ISO9001, CE |
|---|---|---|---|
| Place of Origin: | China | Condition: | New |
| Warranty: | 1 year | Customized sourcing: | available |
What are your strengths?
Ans. LEHIY specializes in industrial automation and control components, offering fast sourcing, stable quality, and competitive prices for global customers.
What is your estimated delivery time?
Ans. Most items ship within 3-7 days. Customized or rare models may take 10-30 working days.
What are your primary product offerings?
Ans. Our main products include PLCs, sensors, valves, solenoid valves, actuators, power modules, transmitters, and complete industrial automation solutions.
How can I get in touch with you?
Ans. You can reach us anytime via Email, WhatsApp, LinkedIn, or our contact page. Our sales engineers respond quickly and provide technical support when needed.
What are your payment terms?
Ans. Standard terms are 50% TT in advance and 50% balance before delivery. We also support Alibaba Trade Assurance and L/C for qualified orders.
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SEL distributor, SEL microcomputer protection device, SEL integrated protection relay
Send the brand, model, part number, quantity, nameplate photos, and application requirements. LEHIY will check availability, suitable alternatives, packing details, and delivery options before quoting.
For discontinued, temporarily unavailable, or configuration-sensitive items, our team can compare the requested model with close variants or compatible replacements for maintenance and spare parts planning.
Use this page as a practical sourcing note for engineers, buyers, and maintenance teams comparing automation components. Check the model name, brand, LEHIY code, application, and replacement requirements before sending an inquiry.
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- Confirm the complete model number and any suffix printed on the nameplate.
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SEL distributor, SEL microcomputer protection device, SEL integrated protection relay verification notes
Please send the full model number, quantity, target delivery date, and nameplate photos. These details help us check the requested product or a close replacement.
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