Siemens SIPROTEC 5 7SD86 Line Differential Protection Relay

Siemens SIPROTEC 5 7SD86 Line Differential Protection Relay Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 5 7SD86 Line Differential Protection Relays in India. We handle requirements for transmission lines, underground cable circuits, utility substations, industrial power networks, protection-panel upgrades and replacement of existing Siemens relays.

The Siemens 7SD86 is a modular line differential relay for medium- and high-voltage lines. It is mainly selected where the protection panel needs fast fault clearance, expandable inputs and outputs, and dependable communication between two or more line ends.

The relay compares current measurements received from each end of the protected circuit. A fault inside the defined line section produces a differential current and initiates tripping. For faults outside the protected zone, the relay remains stable even when the current transformers at different line ends do not behave exactly alike.

Siemens uses an adaptive differential algorithm in the 7SD86 to handle CT errors, current-transformer saturation and capacitive charging current. These points become particularly important on long underground cables, mixed cable and overhead routes, and circuits with different CT arrangements at each substation.

The 7SD86 supports three-pole tripping with a minimum tripping time of 9 ms. It can protect lines with single-ended or multi-ended infeed and can be arranged for schemes with up to six line ends. Transformers and compensating coils may also remain within the differential protection zone when the approved scheme requires this arrangement.

Unlike the compact 7SD82, the 7SD86 uses expandable SIPROTEC 5 hardware. Panel builders can select more current inputs, voltage inputs, binary contacts and communication modules according to the project. This makes the 7SD86 more relevant for large line-protection panels, breaker-and-a-half substations and circuits requiring several alarms, interlocks or communication links.

For Siemens SIPROTEC 7SD86 price and availability, send the complete Siemens article number, required quantity and destination country.

Technical Specifications

• Brand: Siemens
• Product family: SIPROTEC 5
• Model: 7SD86
• Product type: Modular line differential protection relay
• Main application: Protection of overhead lines and underground cables
• Network use: Medium- and high-voltage systems
• Primary protection: Line differential protection
• Tripping arrangement: Three-pole tripping
• Minimum tripping time: 9 ms
• Line configuration: Single-ended and multi-ended lines
• Maximum number of line ends: Up to six
• Standard hardware versions: 12 predefined variants
• Analogue inputs: 4 CT/4 VT or 8 CT/8 VT inputs
• Binary inputs: 5 to 31, depending on the hardware
• Binary outputs: 8 to 46, depending on the hardware
• Hardware arrangement: Modular and expandable
• Housing width: From one-third to two full 19-inch rack widths
• Engineering software: Siemens DIGSI 5
• Communication: Ethernet with optional serial and fibre-optic modules
• Communication modules: Up to four plug-in modules
• IEC 61850: Reporting and GOOSE communication
• Communication redundancy: PRP and HSR on applicable arrangements
• Display: Small or large display, depending on configuration
• Recording: Fault, event and disturbance recording
• Environmental protection: Conformal-coated electronic modules

The exact hardware, display, auxiliary supply, binary contacts, communication interfaces and enabled functions depend on the complete Siemens MLFB.

Protection Functions

Depending on the ordered function package, the Siemens SIPROTEC 7SD86 can provide:

• Phase-selective line differential protection
• Directional overcurrent backup protection
• Phase and earth-fault protection
• Sensitive earth-fault protection
• Ground-fault detection in isolated networks
• Ground-fault detection in compensated-neutral networks
• Current-transformer saturation detection
• Capacitive charging-current compensation
• Fault-location functions
• Three-pole automatic reclosing
• Targeted overhead-line section reclosing
• Arc protection
• Underfrequency load shedding
• Active- and reactive-power protection
• Voltage and frequency monitoring
• Circuit-breaker control
• Switchgear interlocking
• Programmable trip and alarm logic

Not every optional function is included in every 7SD86 relay. The complete article number should be checked before preparing a quotation or offering a replacement.

Features

• Fast line differential protection with 9 ms minimum tripping time
• Three-pole tripping for medium- and high-voltage line applications
• Protects overhead lines, underground cables and mixed routes
• Supports two-terminal and multi-terminal protection schemes
• Can cover arrangements with up to six line ends
• An adaptive algorithm improves sensitivity during internal faults
• Remains stable during CT errors and current-transformer saturation
• Charging-current compensation supports long cable circuits
• Transformers can remain inside the differential protection zone
• Suitable for lines containing compensating coils
• Expandable inputs and outputs suit large protection panels
• Up to four communication modules can be included
• Communicates through optical fibre, two-wire links and suitable networks
• Supports applicable SIPROTEC 4 and SIPROTEC 5 line-end devices
• Fault-location information supports faster line inspection
• IEC 61850 allows integration with substation automation systems
• PRP and HSR options support redundant Ethernet networks
• Conformal-coated boards support demanding substation environments
• Suitable for new projects, extensions and relay replacement

Siemens also provides PMU and basic power-quality functions on applicable configurations, but these are normally secondary to the main line differential protection requirement.

Applications

Siemens SIPROTEC 5 7SD86 Line Differential Protection Relays are used for:

• High-voltage transmission lines
• Medium-voltage connecting lines
• Overhead-line differential protection
• Underground cable differential protection
• Mixed overhead-line and cable routes
• Two-terminal transmission lines
• Multi-terminal and tapped lines
• Lines with up to six ends
• Long underground cable circuits
• Ring and meshed electrical networks
• Grid interconnection lines
• Utility transmission substations
• Utility distribution substations
• Breaker-and-a-half substations
• Industrial substations
• Captive power plants
• Plant interconnection cables
• Renewable-energy evacuation lines
• Wind-farm grid connections
• Solar power transmission links
• Lines with transformers inside the protection zone
• Lines containing compensating coils
• Substation extension projects
• Line protection-panel modernisation
• Replacement of older Siemens line differential relays

The 7SD86 is particularly useful for important circuits where an internal line or cable fault must be cleared quickly without tripping for faults outside the protected section.

When to Select the Siemens 7SD86

The 7SD86 is generally considered when a compact fixed-hardware relay does not provide enough inputs, outputs or communication interfaces.

It is a better fit for projects requiring:

• Expandable panel hardware
• Several circuit-breaker and disconnector contacts
• More alarm and trip outputs
• Redundant protection communication
• Multi-ended line protection
• Breaker-and-a-half switchgear
• Integration with an IEC 61850 station network
• Future expansion of the protection panel

Where the project also requires distance protection in the same relay, a SIPROTEC 7SL86 may be more appropriate. The 7SD86 focuses mainly on line differential protection with directional and other backup functions.

Siemens 7SD82 and 7SD86 Difference

Both relays provide line differential protection with three-pole tripping, but their hardware arrangements are different.

• SIPROTEC 7SD82: Compact relay with a fixed hardware arrangement and 19 ms minimum tripping time
• SIPROTEC 7SD86: Modular relay with expandable I/O, up to four communication modules and 9 ms minimum tripping time

The 7SD82 can suit a straightforward line or cable scheme where the available contacts and communication options are sufficient. The 7SD86 is more suitable for larger panels and projects needing faster operation, additional I/O or more communication flexibility.

Details Required for Quotation

A request for only “Siemens 7SD86 Relay” is not enough to identify the correct device. Different ordering codes can have different hardware, displays, communication modules and function packages.

For an accurate quotation, share:

• Complete Siemens MLFB or article number
• Required quantity
• Destination country
• Required communication interface, where specified
• For replacement enquiries, also send:
• Clear photograph of the existing relay nameplate
• Photograph of the front display
• Photograph of the rear terminal arrangement
• Existing firmware details, where available
• Model installed at the opposite end of the line
• Existing protection communication medium

The line-end relays and their communication interfaces must remain compatible. This is especially important where an existing scheme includes both SIPROTEC 4 and SIPROTEC 5 devices.

Siemens SIPROTEC 5 7SD86 Supplier and Exporter in India

ARP IMPEX supplies Siemens SIPROTEC 5 7SD86 Line Differential Protection Relays for utilities, EPC contractors, switchgear manufacturers, protection-panel builders, power plants and industrial users.

We handle requirements for Siemens 7SD86 line differential relays, modular cable protection relays, multi-terminal line protection, IEC 61850 line relays, substation upgrades and replacement of existing Siemens numerical relays.

The Siemens SIPROTEC 7SD86 price depends on the complete article number, analogue inputs, binary I/O, housing size, communication modules, protection functions and ordered quantity.

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