Siemens SIPROTEC 5 7SL86 Line Differential and Distance Protection Relay

Siemens SIPROTEC 5 7SL86 Line Differential and Distance Protection Relay Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 5 7SL86 Line Differential and Distance Protection Relays in India. We handle enquiries for transmission line protection, underground cable circuits, utility substations, industrial power networks, panel upgrades and replacement of existing Siemens relays.

The SIPROTEC 7SL86 is generally selected when the line-protection scheme needs both differential and distance protection in the same device. It suits important overhead lines, underground cables and mixed circuits where fast fault clearance and dependable backup protection are required.

Line differential protection covers faults within the protected section, while distance protection can work as a backup or as a second main protection function. This combination reduces the need to install separate relays for each protection method.

The 7SL86 is not limited to a simple two-terminal line. It can be used for multi-ended networks with up to six line ends, making it useful for ring networks, tapped lines, grid interconnections and complex transmission arrangements.

Another reason buyers select the 7SL86 is its modular hardware. Current inputs, voltage inputs, binary contacts and communication modules can be chosen according to the protection panel. This gives more flexibility than a compact fixed-hardware relay, especially when the project includes several breakers, interlocks or communication channels.

The relay can also deal with charging current on long cables, CT saturation and different fault-current conditions at each line end. These capabilities help maintain stable operation during external faults while allowing fast tripping for faults inside the protected zone.

For Siemens SIPROTEC 7SL86 price and availability, share the complete Siemens article number, required quantity and delivery country.

Technical Specifications

• Brand: Siemens
• Series: SIPROTEC 5
• Model: 7SL86
• Relay type: Line differential and distance protection relay
• Primary use: Protection of overhead lines and underground cables
• Main protection: Line differential protection
• Backup protection: Distance and directional overcurrent protection
• Line arrangements: Two-ended and multi-ended lines
• Maximum line ends: Up to six, depending on the scheme
• Trip arrangement: Three-pole tripping
• Current and voltage inputs: Depend on the selected hardware version
• Binary inputs and outputs: Expandable through modular hardware
• Communication: Ethernet, serial and fibre-optic options
• Engineering software: Siemens DIGSI 5
• IEC 61850: Available for station communication and GOOSE messaging
• Control functions: Circuit-breaker control and interlocking
• Records: Fault, event and disturbance recording
• Mounting: Line-protection and substation control panels

The complete Siemens MLFB must be checked before quotation because hardware size, I/O arrangement, communication ports and enabled functions can vary.

Protection Functions

• The available protection package may include:
• Line differential protection
• Distance protection
• Directional overcurrent protection
• Phase and earth-fault protection
• Circuit-breaker failure protection
• Automatic reclosing
• Fault-location functions
• Power-swing detection and blocking
• Out-of-step protection
• Voltage and frequency protection
• Synchrocheck
• Underfrequency load shedding
• Arc protection
• Trip-circuit supervision
• Switchgear control and interlocking

Not every Siemens 7SL86 article number includes the same functions. Voltage inputs, communication interfaces and optional protection stages should be confirmed from the ordering code.

Key Features

Differential and Distance Protection in One Relay

The 7SL86 combines two widely used line-protection methods. Differential protection provides fast and selective fault clearing within the protected line section, while distance protection provides independent backup coverage.

Built for Multi-Ended Lines

The relay can cover line arrangements with several terminals. This makes it useful for tapped transmission lines, grid interconnections, ring networks and other schemes where protection is required at more than two ends.

Suitable for Cables and Overhead Lines

The relay can protect underground cables, overhead transmission lines and routes containing both types. Its charging-current compensation is especially useful on long cable circuits.

Expandable Hardware

The modular SIPROTEC 5 design allows additional binary inputs, outputs and communication modules to be included according to the project. This helps when the panel has multiple breakers, disconnectors, alarms or interlocking requirements.

Fast Fault Clearance

The 7SL86 is designed for applications where quick isolation of line faults is important. Fast three-pole tripping helps reduce equipment stress and limits the effect of the fault on the remaining network.

Flexible Communication

Protection communication can use fibre-optic links, communication networks or other available interfaces. IEC 61850 support also allows integration with modern substation automation systems.

Useful for Retrofit Projects

The relay can be considered for replacement of older Siemens line-protection devices where the existing panel requires upgraded communication, additional I/O or combined differential and distance protection.

Applications

• The Siemens SIPROTEC 5 7SL86 is used for:
• High-voltage transmission-line protection
• Medium-voltage line protection
• Underground cable differential protection
• Overhead-line differential protection
• Mixed cable and overhead-line circuits
• Two-terminal transmission lines
• Multi-terminal and tapped lines
• Grid interconnection lines
• Ring and meshed electrical networks
• Utility transmission substations
• Utility distribution substations
• Industrial power-distribution systems
• Captive power plants
• Renewable-energy grid connections
• Wind and solar evacuation lines
• Breaker-and-a-half substation schemes
• Lines with transformers inside the protected zone
• Substation extension and modernisation projects
• Replacement of older Siemens line differential relays

The 7SL86 is particularly useful where a project needs more than basic feeder protection. It is normally selected for important lines where differential protection, distance backup, fast operation and reliable communication between line ends are all required.

Siemens SIPROTEC 7SL82 and 7SL86 Difference

Both models combine line differential and distance protection, but they are intended for different panel requirements.

The 7SL82 has a compact hardware arrangement and suits projects where the available inputs, outputs and communication options are sufficient.

The 7SL86 offers expandable hardware and is better suited to larger protection schemes, multi-ended lines and panels requiring additional contacts or communication interfaces.

The correct model should be selected according to the complete protection drawing and not only by comparing the relay names.

Information Required for Quotation

• For an accurate Siemens 7SL86 quotation, share:
• Complete Siemens MLFB or article number
• Required quantity
• Destination country
• Required communication interface, if specified
• For replacement requirements, send clear photographs of the existing relay nameplate and rear
• terminals.

If the article number is unavailable, share the existing relay model and confirm whether the protected circuit is an overhead line, underground cable or mixed route.

Siemens SIPROTEC 5 7SL86 Supplier and Exporter in India

ARP IMPEX supplies Siemens SIPROTEC 5 7SL86 Line Differential and Distance Protection Relays for utilities, EPC contractors, panel builders, switchgear manufacturers, power plants and industrial users.

We handle requirements for new line-protection panels, substation upgrades, relay replacement and export projects. The Siemens 7SL86 price depends on the full article number, hardware configuration, communication modules and ordered quantity.

Send the complete Siemens part number, quantity and destination country for price, availability and export quotation.