Product Overview

The ALSTOM LC105A-1​is a advanced line current differential protection relay designed for high-voltage transmission line protection within ALSTOM’s comprehensive power system protection portfolio.This sophisticated protection device utilizes current differential principles to provide unit protection for transmission lines,offering high-speed fault clearance for phase and earth faults.Engineered with modern microprocessor technology and advanced communication capabilities,the LC105A-1​ensures reliable operation in complex power network configurations,including multi-terminal lines and series-compensated circuits.

As part of ALSTOM’s protection relay family,the ALSTOM LC105A-1​incorporates sophisticated charging current compensation algorithms and phase comparison techniques to provide secure operation during load switching and external faults.The relay’s multi-terminal support enables protection of complex line configurations without compromising speed or sensitivity.The ALSTOM LC105A-1​features comprehensive communication interfaces including IEC 61850 process bus support,enabling seamless integration into digital substations while maintaining compatibility with conventional CT/VT installations.Its robust design and advanced filtering techniques ensure stable operation in electrically noisy substation environments.

Technical Specifications

Product Model|LC105A-1​

Manufacturer|ALSTOM(now part of GE Grid Solutions)

Product Type|Line Current Differential Protection Relay

Rated Voltage|Up to 765kV system voltage

Rated Frequency|50/60Hz

Differential Elements|Phase and earth fault detection

Communication Channels|Fiber optic,PLC,communication-assisted

Operating Time|<20ms for phase faults

Charging Current Compensation|Adaptive compensation algorithm

CT Requirements|1A or 5A secondary

Communication Protocols|IEC 61850,IEC 60870-5-103,DNP3.0

Data Synchronization|GPS IRIG-B,IEEE 1588 PTP

Fault Records|100+events with oscillography

Binary Inputs|16 programmable inputs

Binary Outputs|12 relay outputs

Power Supply|48-250V DC/110-240V AC

Operating Temperature|-25°C to+70°C

Protection Degree|IP52(front panel)

Dimensions|177mm×177mm×200mm

Standards|IEC 60255,IEEE C37.94

Main Features and Advantages

The ALSTOM LC105A-1​delivers exceptional protection performance through its advanced current differential algorithm with adaptive charging current compensation.The relay’s multi-terminal capability supports up to six terminals,making it suitable for complex network configurations including T-connected lines and breaker-and-a-half arrangements.The LC105A-1​features sophisticated phase comparison logic that provides additional protection security during CT saturation conditions,while the integrated distance backup protection ensures complete line protection coverage.

Communication reliability is a cornerstone of the ALSTOM LC105A-1​design.The relay supports multiple communication media including direct fiber optic,multiplexed networks,and power line carrier systems.Advanced channel monitoring and redundancy features maintain protection availability even during communication impairments.The ALSTOM LC105A-1​also includes comprehensive fault location capability using impedance-based and traveling wave methods,providing accurate fault distance estimation for rapid line maintenance and restoration.

Application Field

In extra-high-voltage transmission systems,the ALSTOM LC105A-1​provides primary protection for critical interconnectors and long transmission lines.The relay’s charging current compensation capability ensures correct operation on long EHV lines where capacitive current effects are significant.In series-compensated line applications,the LC105A-1’s advanced algorithms maintain stability during sub-synchronous oscillations and other special system conditions.

The protection relay excels in various transmission system applications:

EHV Transmission Lines:400kV and above transmission corridor protection

Multi-terminal Lines:T-connected and multi-terminal configuration protection

Series-Compensated Lines:Protected lines with series capacitor compensation

Cross-Border Interconnectors:International interconnection protection

Renewable Integration:Grid connection points for large-scale renewable farms

Related Products

ALSTOM LC105A-2​-Enhanced version with additional communication protocols

ALSTOM LC105B-1​-Multi-terminal optimized version

ALSTOM P14x​-Distance protection relay series

ALSTOM P13x​-Feeder management relays

ALSTOM P12x​-Distribution protection relays

ALSTOM MC​-Motor protection relays

ALSTOM BC​-Busbar protection systems

Installation and Maintenance

Installation preparation:Proper installation of the ALSTOM LC105A-1​requires careful planning of CT circuits and communication channel configuration.The relay should be mounted in a protected panel with adequate space for fiber optic cable bending radius.CT circuits must be properly coordinated to ensure matching characteristics across all line terminals.

Maintenance recommendations:Regular maintenance includes verification of differential protection settings and communication channel performance testing.The relay’s self-monitoring functions should be reviewed periodically,and event records should be analyzed to identify potential issues.Communication channel delay measurements should be performed during commissioning and after any network changes.

Product Guarantee

We guarantee that every ALSTOM LC105A-1​line current differential protection relay is genuine ALSTOM product with full manufacturer certification.Our quality assurance process includes comprehensive testing of all protection functions and communication interfaces.The product is backed by technical support for configuration and commissioning assistance,ensuring reliable transmission line protection for critical power infrastructure.

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