Siemens SIPROTEC 5 7SL82 Line Differential and Distance Protection Relay

ARP IMPEX is an independent supplier and exporter of Siemens SIPROTEC 5 7SL82 Line Differential and Distance Protection Relays in India. We handle requirements for utility substations, industrial power networks, line protection panels, renewable-energy projects, panel upgrades and replacement of existing Siemens relays.

The Siemens SIPROTEC 7SL82 combines line differential protection and distance protection in one compact relay. It is used for protecting overhead lines and underground cables in medium-voltage and high-voltage networks.

Line differential protection works as the main protection and provides fast fault clearance across the protected line section. Distance protection can be configured as backup protection or as a second main protection function. This combination is useful where utilities and industrial users want both protection methods within one relay rather than installing separate devices.

The 7SL82 can protect lines with single-ended or multi-ended infeed and supports applications with up to six line ends. Transformers and compensating coils can also remain within the protected zone, depending on the line arrangement and relay configuration.

The adaptive differential protection algorithm maintains sensitivity while accounting for CT errors, CT saturation and capacitive charging current. This helps the relay operate correctly on cables, overhead lines and mixed line sections where charging current or unequal CT performance can affect conventional differential protection.

Protection communication can take place through optical fibre, two-wire connections or communication networks. The 7SL82 can also work with applicable SIPROTEC 4 and SIPROTEC 5 line protection devices, which can be useful during phased substation upgrades.

Siemens DIGSI 5 is used for relay settings, logic and commissioning. IEC 61850 communication is available through the integrated Ethernet interface, with optional communication modules for other protocols and protection schemes.

For the Siemens SIPROTEC 7SL82 price, availability or export quotation, share the complete Siemens article number, required quantity and destination country.

Technical Specifications

• Brand: Siemens
• Product family: SIPROTEC 5
• Model: 7SL82
• Product type: Combined line differential and distance protection relay
• Main application: Protection of overhead lines and underground cables
• Voltage application: Medium-voltage and high-voltage systems
• Main protection: Line differential protection
• Backup protection: Distance and directional protection
• Tripping arrangement: Three-pole tripping
• Minimum tripping time: 19 ms
• Current inputs: Four CT inputs
• Voltage inputs: Four optional VT inputs
• Binary inputs: 11 or 23, depending on the hardware version
• Binary outputs: 9 or 16, depending on the hardware version
• Display options: Small or large display
• Housing width: One-third of a 19-inch rack
• Engineering software: Siemens DIGSI 5
• Communication: Integrated Ethernet with optional communication modules
• IEC 61850: Reporting and GOOSE communication
• Recording: Fault, event and disturbance records

The SIPROTEC 7SL82 uses a compact base-module arrangement and does not accept the smaller 1/6 expansion modules. The complete I/O configuration, display, communication ports and enabled functions must therefore be checked against the Siemens MLFB or article number.

Main Protection Functions

Depending on the selected configuration, the Siemens SIPROTEC 7SL82 can provide:

• Line differential protection
• Distance protection as backup or second main protection
• Directional overcurrent backup protection
• Phase and earth-fault protection
• Ground-fault detection in isolated and compensated networks
• Current-transformer saturation detection
• Adaptive power-swing blocking
• Fault-location functions
• Automatic reclosing
• Arc protection
• Underfrequency load shedding
• Voltage and reactive-power protection
• Synchrocheck and switchgear interlocking
• Programmable protection and control logic

The protection package depends on the ordered relay configuration. Not every 7SL82 article number will have the same voltage inputs, communication modules or optional functions.

Features

• Combines line differential and distance protection in one relay
• Suitable for overhead lines and underground cables
• Supports single-ended and multi-ended line arrangements
• Can be used in schemes with up to six line ends
• Provides three-pole tripping
• Offers a minimum tripping time of 19 ms
• Adaptive differential protection improves sensitivity and stability
• Accounts for the capacitive charging current in long cables and lines
• Remains stable during CT saturation and external faults
• Distance protection provides independent backup protection
• Supports protection communication through fibre, two-wire links or networks
• Allows applicable SIPROTEC 4 and SIPROTEC 5 device combinations
• Ground-fault functions support isolated and compensated systems
• Fault-location functions help maintenance teams identify the affected line section
• DIGSI 5 supports settings, logic, testing and commissioning
• IEC 61850 supports modern substation communication
• Fault and disturbance records assist with trip investigation
• Compact housing helps save space inside line protection panels
• Coated electronic modules support demanding substation conditions
• Suitable for new installations, retrofit work and relay replacement

Siemens positions the 7SL82 as a compact and cost-optimised solution where both line differential and distance protection are required.

Applications

• Siemens SIPROTEC 5 7SL82 Line Protection Relays are used for:
• Medium-voltage line protection
• High-voltage line protection
• Overhead transmission lines
• Overhead distribution lines
• Underground cable feeders
• Mixed overhead-line and cable circuits
• Single-ended line protection
• Double-ended line protection
• Multi-ended line protection
• Lines with up to six ends
• Radial distribution systems
• Ring distribution networks
• Meshed electrical networks
• Utility transmission substations
• Utility distribution substations
• Industrial substations
• Captive power plants
• Renewable-energy grid connections
• Transformer feeders
• Lines with transformers inside the protection zone
• Protection-panel retrofit projects
• Replacement of older Siemens line protection relays

The relay can also record basic power-quality information and provide PMU functions on applicable configurations, but these are normally secondary considerations when selecting the 7SL82 for line differential and distance protection.

Selecting the Correct Siemens 7SL82 Relay

“Siemens SIPROTEC 7SL82” does not identify one fixed relay configuration. Models can differ by voltage inputs, binary contacts, display size, communication modules and enabled protection functions.

For an accurate quotation, share:

• Complete Siemens article number or MLFB
• Required quantity
• Destination country
• Communication requirement, where applicable

For replacement enquiries, also share clear photographs of the existing relay nameplate, front display and rear terminal arrangement.

If the Siemens article number is unavailable, share the existing relay model and confirm whether the requirement is for an overhead line, underground cable or mixed line section.

Siemens SIPROTEC 5 7SL82 Supplier and Exporter in India

ARP IMPEX supplies Siemens SIPROTEC 5 7SL82 Line Differential and Distance Protection Relays for utilities, EPC contractors, switchgear manufacturers, panel builders, power plants and industrial maintenance companies.

We handle enquiries for:

• Siemens SIPROTEC 5 7SL82 Protection Relays
• Line differential protection relays
• Combined differential and distance protection relays
• Overhead-line protection relays
• Underground cable differential protection relays
• Multi-ended line protection relays
• Line protection relays with IEC 61850
• Replacement Siemens numerical relays
• Line protection-panel retrofit requirements
• Siemens 7SL82 price and availability
• Siemens line protection relay export requirements

The Siemens SIPROTEC 7SL82 price depends on the complete article number, voltage-input requirement, binary I/O arrangement, communication modules, enabled functions and ordered quantity.

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