Siemens SIPROTEC 6MD86 Bay Controllers

Siemens SIPROTEC 6MD86 Bay Controllers Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 6MD86 Bay Controllers in India. We handle requirements for high-voltage and extra-high-voltage substations, transmission switchyards, power plants, grid interconnections, industrial substations and replacement of existing Siemens bay control units.

The Siemens SIPROTEC 6MD86 is a modular control and automation device used to operate and supervise the complete switchgear arrangement within a substation bay. It can control circuit breakers, disconnectors, earthing switches and other switching devices while checking the required interlocking conditions before each operation.

The 6MD86 is generally selected for bays with a larger number of switching devices, measuring circuits and control signals. It is particularly relevant for double-busbar substations, breaker-and-a-half arrangements, transmission-line bays, transformer bays, bus-coupler bays and extra-high-voltage switchyards.

Control, interlocking, measurement, synchrocheck, automation and selected protection functions can be combined within one device. This can reduce the number of separate auxiliary relays, control switches, meters and hardwired logic used in the panel.

The device belongs to the Siemens SIPROTEC 5 platform and is configured through DIGSI 5. Its modular hardware allows the current inputs, voltage inputs, binary inputs, relay outputs, display and communication interfaces to be selected according to the actual substation requirement.

For Siemens SIPROTEC 6MD86 price and availability, send the complete Siemens order code, required quantity and destination country.

Bay Control and Switchgear Operation

A high-voltage bay may contain several switching devices that must operate in a fixed sequence.

Depending on the substation arrangement, the Siemens 6MD86 can control:

• Circuit breakers
• Busbar disconnectors
• Line disconnectors
• Transformer disconnectors
• Earthing switches
• Transfer-bus disconnectors
• Bus-coupler equipment
• Bus-section equipment
• Motor-operated isolators
• Switching devices in breaker-and-a-half schemes
• Switching devices in double-busbar arrangements

The device receives the open, closed and intermediate position indications from the switchgear. Before accepting a command, it checks whether the configured operating conditions have been met.

Commands may come from:

• Local 6MD86 operator panel
• Substation control room
• SCADA system
• Network control centre
• Station HMI
• Remote terminal unit
• External control switches
• Protection relay
• Automatic switching sequence
• IEC 61850 GOOSE message
• Programmable logic inside the device

The 6MD86 can block an incorrect command before the primary switching equipment operates.

Control of Multiple Switching Devices

The Siemens SIPROTEC 6MD86 can control up to 20 switching devices, depending on its hardware and configuration.

This makes it suitable for bays where one controller must supervise several circuit breakers, disconnectors and earthing switches.

A single 6MD86 may be used for:

• One complex transmission bay
• A double-busbar feeder bay
• A transformer bay with several switching devices
• A breaker-and-a-half diameter
• A bus-coupler and bus-section arrangement
• Centralised control of several medium-voltage feeders
• A large industrial switchgear section

The final number of controlled devices depends on the required position indications, command outputs, interlocking signals and panel philosophy.

Switchgear Interlocking

Switchgear interlocking prevents equipment from operating in an unsafe or incorrect sequence.

The Siemens 6MD86 can be configured to prevent:

• Closing a circuit breaker while an earthing switch is closed
• Closing an earthing switch onto an energised conductor
• Operating a disconnector while load current is flowing
• Selecting two busbars in an unauthorised arrangement
• Closing a bus coupler without the required synchrocheck
• Operating equipment during an active maintenance condition
• Issuing simultaneous local and remote commands
• Changing the busbar connection in the wrong sequence
• Closing onto a faulted or isolated section
• Operating a breaker when the required auxiliary conditions are missing

Interlocking conditions can be created from hardwired signals, internal device logic or information received from other bay controllers through IEC 61850 GOOSE.

Communication-based interlocking can reduce the amount of copper wiring between different control panels.

Synchrocheck and Synchronising

The Siemens SIPROTEC 6MD86 can check the electrical conditions on both sides of an open circuit breaker before allowing it to close.

The synchrocheck function can supervise:

• Voltage magnitude
• Voltage difference
• Frequency
• Frequency difference
• Phase-angle difference
• Live-line and live-bus conditions
• Dead-line and live-bus conditions
• Live-line and dead-bus conditions
• Dead-line and dead-bus conditions

Synchrocheck is commonly required for:

• Transmission-line circuit breakers
• Bus-coupler breakers
• Bus-section breakers
• Grid interconnection bays
• Power-plant incomers
• Transformer incomers
• Double-busbar switching
• Breaker-and-a-half schemes

The required voltage inputs, voltage selection and synchrocheck functions must be included in the selected Siemens 6MD86 configuration.

Point-on-Wave Switching

Point-on-wave switching is an important function available with the Siemens 6MD86.

Instead of closing or opening all three circuit-breaker poles at an arbitrary point on the voltage waveform, the device controls each pole at a calculated electrical angle.

This function can help reduce:

• Transformer inrush current
• Switching overvoltage
• Capacitor-bank switching transients
• Electrodynamic stress
• Dielectric stress
• Mechanical stress on circuit breakers
• Disturbance to the connected power system

Point-on-wave switching may be considered for:

• Power transformers
• Shunt reactors
• Capacitor banks
• Transmission lines
• Cables
• Harmonic filters
• High-voltage circuit breakers
• Extra-high-voltage switching applications

The function requires suitable circuit breakers with known and repeatable operating times. Breaker pole timing, compensation settings, measuring inputs and operating conditions must be established during engineering and commissioning.

Breaker-and-a-Half Applications

A breaker-and-a-half arrangement normally uses three circuit breakers to connect two circuits between two busbars.

The control logic is more complex than a normal single-breaker feeder bay because each circuit shares one circuit breaker with the neighbouring circuit.

The Siemens SIPROTEC 6MD86 can be configured to manage:

• Three circuit breakers within one diameter
• Busbar disconnector positions
• Line or transformer disconnectors
• Earthing switches
• Shared-breaker control
• Switching interlocks
• Synchrocheck
• Circuit-breaker failure logic
• Automatic reclosing
• Backup protection
• Local and remote switching commands

The modular I/O capacity makes the 6MD86 suitable for breaker-and-a-half transmission switchyards where many position indications and command outputs are required.

Protection Functions

The primary role of the Siemens 6MD86 is bay control and automation. Protection functions can also be included according to the project requirement.

Available functions may include:

• Phase overcurrent protection
• Ground overcurrent protection
• Directional phase overcurrent protection
• Directional ground-fault protection
• Negative-sequence overcurrent protection
• Voltage-dependent overcurrent protection
• Undervoltage protection
• Overvoltage protection
• Rate-of-voltage-change protection
• Underfrequency protection
• Overfrequency protection
• Rate-of-change-of-frequency protection
• Active-power protection
• Reactive-power protection
• Thermal overload protection
• Switch-onto-fault protection
• High-current instantaneous protection
• Circuit-breaker failure protection
• Automatic reclosing
• Trip-circuit supervision
• Closed-circuit supervision
• Lockout function
• Underfrequency load shedding
• Fault-location function
• Arc protection
• Circuit-breaker wear monitoring
• Synchrocheck and synchronising
• External trip processing

The available protection functions depend on the Function Points loaded into the device and its measuring-input configuration.

A dedicated distance, line differential or transformer differential relay may still be required as the main protection. The 6MD86 can then provide control, automation and backup protection within the same bay.

Technical Specifications

The Siemens SIPROTEC 6MD86 is a configurable product. The actual hardware and functions depend on the complete order code.

• Brand: Siemens
• Product family: SIPROTEC 5
• Model: 6MD86
• Product type: Bay controller with protection and automation functions
• Voltage application: Medium-voltage to extra-high-voltage systems
• Main use: Transmission and complex substation bay control
• Controlled switching devices: Up to 20, depending on configuration
• Standard hardware: Six predefined variants
• Current inputs: Configurations with up to 8 CT inputs
• Voltage inputs: Configurations with up to 8 VT inputs
• Binary inputs: Approximately 11 to 75 in standard variants
• Binary outputs: Approximately 9 to 41 in standard variants
• Extended binary inputs: More than 240 possible with suitable expansion hardware
• Housing width: From 1/3 × 19 inches up to 2/1 × 19 inches
• Display options: No display, small display or large display
• Mounting: Flush mounting or surface mounting
• Power supply: Standard or redundant supply options
• Local control: Integrated operator panel
• Key switches: Available on applicable front-panel versions
• Engineering software: Siemens DIGSI 5
• Interlocking: Hardwired, internal logic and IEC 61850 based
• Synchrocheck: Available according to configuration
• Point-on-wave switching: Available as an optional function
• Automatic reclosing: Available
• Circuit-breaker failure protection: Available
• Arc protection: Available with suitable module and sensors
• PMU: IEEE C37.118 synchrophasor option
• Power quality: Basic power-quality recording
• Fault recording: Up to approximately 80 seconds at 8 kHz or 320 seconds at 2 kHz
• Communication modules: Up to four pluggable modules
• Integrated communication: Electrical Ethernet interface
• IEC 61850: Reporting and GOOSE
• Process bus: IEC 61850-9-2 options
• Ethernet redundancy: PRP and HSR
• Environmental protection: Conformal-coated electronic boards
• Operating temperature: Extended range on applicable hardware
• Cybersecurity: Role-based access and network authentication options

The current-transformer inputs, voltage-transformer inputs, binary I/O, housing, communication ports and licensed functions must be confirmed from the complete Siemens order code.

Communication Options

Depending on the selected modules, the Siemens 6MD86 can support:

• IEC 61850-8-1
• IEC 61850 reporting
• IEC 61850 GOOSE
• IEC 61850-9-2 process-bus client
• IEC 61850-9-2 merging-unit stream
• IEC 60870-5-103
• IEC 60870-5-104
• DNP3 serial
• DNP3 TCP
• Modbus TCP
• PROFINET IO
• PROFINET IO S2 redundancy
• IEEE C37.118 synchrophasor transmission
• SNMP network management
• PTP time synchronisation
• SNTP time synchronisation

Electrical and fibre-optic communication modules are available for applicable protocols.

The correct module must be selected according to:

• Required protocol
• Number of communication ports
• Electrical or fibre connection
• Required transmission distance
• Station-bus architecture
• Process-bus architecture
• PRP or HSR network redundancy
• Protection communication requirement
• Existing SCADA or substation automation system

IEC 61850 Substation Automation

The Siemens 6MD86 can form part of an IEC 61850 station-bus or process-bus system.

GOOSE messaging can be used for fast exchange of:

• Switchgear position indications
• Interlocking conditions
• Protection trips
• Blocking signals
• Circuit-breaker failure initiation
• Automatic reclosing signals
• Busbar-selection information
• Load-shedding commands
• Transfer-trip signals
• Switching-sequence information

In a digital substation, the 6MD86 can receive sampled current and voltage values through an IEC 61850-9-2 process-bus connection when the correct communication hardware is installed.

The device can also work as a merging unit in applicable configurations.

Phasor Measurement Unit

A PMU function can be added to the Siemens SIPROTEC 6MD86.

The device can measure and transmit time-synchronised phasor values according to IEEE C37.118.

These measurements may include:

• Voltage phasors
• Current phasors
• Frequency
• Rate of change of frequency
• Phase angle
• Active power
• Reactive power

PMU data can be transmitted to a phasor data concentrator for:

• Wide-area monitoring
• Grid-stability analysis
• Oscillation monitoring
• Phase-angle supervision
• Transmission-network assessment
• Post-disturbance investigation

The PMU option is particularly relevant for transmission and extra-high-voltage substations.

Arc Protection

The Siemens 6MD86 can include arc protection using optical point sensors or line sensors.

The function detects the light produced by an internal switchgear arc and can combine this signal with an overcurrent condition before issuing a trip.

Arc protection can be used for:

• Switchgear compartments
• Circuit-breaker compartments
• Cable compartments
• Busbar chambers
• Indoor substations
• Metal-clad switchgear
• Industrial distribution panels

Applicable arrangements can provide very fast tripping, helping limit equipment damage and personnel exposure.

The sensor type, number of sensors, zone arrangement and trip outputs must be selected from the actual switchgear layout.

Power-Quality Monitoring

The Siemens SIPROTEC 6MD86 can record basic power-quality information.

Depending on the selected functions, this may include:

• Voltage unbalance
• Voltage rise
• Voltage dip
• Voltage interruption
• Total harmonic distortion
• Total demand distortion
• Individual harmonic values
• Current and voltage measurements
• Active power
• Reactive power
• Power factor
• Frequency

Power-quality records can assist with checking abnormal voltage conditions, harmonic loading and equipment disturbances within the bay.

A dedicated power-quality recorder may still be required where the project calls for detailed compliance reporting or advanced waveform analysis.

Fault and Event Recording

The 6MD86 records switching, protection, automation and communication events.

Records may include:

• Fault currents and voltages
• Protection pickup
• Trip commands
• Circuit-breaker operation
• Disconnector operation
• Earthing-switch operation
• Interlocking blocks
• Synchrocheck results
• Automatic reclosing sequences
• Binary input changes
• Relay output operations
• Point-on-wave switching records
• Communication alarms
• Device diagnostics
• Cybersecurity events

Records can be accessed using DIGSI 5 or the device web interface.

This information helps engineers check what happened before, during and after a circuit-breaker trip or switching operation.

Features

• Designed for medium-voltage to extra-high-voltage substations
• Suitable for complex transmission switchyards
• Controls up to 20 switching devices
• Supports double-busbar arrangements
• Suitable for breaker-and-a-half schemes
• Controls circuit breakers, disconnectors and earthing switches
• Provides local and remote bay operation
• Flexible switchgear interlocking
• Synchrocheck before circuit-breaker closing
• Point-on-wave switching is available
• Automatic reclosing can be included
• Circuit-breaker failure protection is available
• Optional backup overcurrent protection
• High-density binary input and output configurations
• Up to 8 current and 8 voltage measuring inputs
• Expandable hardware for large control schemes
• Standard and redundant power-supply options
• Small and large graphical display options
• Key-switch operator panels are available
• Graphical logic editor supports custom switching sequences
• IEC 61850 reporting and GOOSE communication
• Process-bus integration is available
• PRP and HSR Ethernet redundancy
• Several serial and Ethernet protocols are supported
• PMU synchrophasor option is available
• Arc-protection integration is available
• Basic power-quality recording
• Long-duration fault recording
• Browser-based access to records and diagnostics
• Conformal-coated circuit boards are standard
• Suitable for new substations and retrofit work
• DIGSI 5 supports engineering, testing and commissioning

Applications

Siemens SIPROTEC 6MD86 Bay Controllers are used in:

• High-voltage substations
• Extra-high-voltage substations
• Transmission substations
• Grid interconnection substations
• Double-busbar switchyards
• Breaker-and-a-half switchyards
• Ring-bus substations
• Transmission-line bays
• Underground cable bays
• Transformer bays
• Reactor bays
• Capacitor-bank bays
• Bus-coupler bays
• Bus-section bays
• Power-plant switchyards
• Thermal power stations
• Hydro power stations
• Renewable energy evacuation substations
• Solar power substations
• Wind-farm pooling substations
• Captive power plants
• Steel plants
• Cement plants
• Refineries
• Petrochemical plants
• Oil and gas facilities
• Mining projects
• Railway power systems
• Industrial power-distribution systems
• IEC 61850 digital substations
• Process-bus projects
• Substation automation upgrades
• Replacement of older bay control units

Use in Double-Busbar Substations

A double-busbar bay may include one circuit breaker, two busbar disconnectors, a line disconnector and one or more earthing switches.

The Siemens 6MD86 can monitor each position and check the switching sequence before accepting a command.

The device can also select the correct busbar voltage for synchrocheck according to the active busbar connection.

Information from bus-coupler and other feeder bays can be received through hardwired signals or IEC 61850 GOOSE communication.

This makes the Siemens 6MD86 suitable for double-busbar feeder control, busbar selection, changeover switching and circuit-breaker closing supervision.

Use in Transmission-Line Bays

In a transmission-line bay, the 6MD86 can carry out:

• Circuit-breaker control
• Disconnector control
• Earthing-switch control
• Switchgear interlocking
• Synchrocheck
• Automatic reclosing
• Circuit-breaker failure protection
• Trip-circuit supervision
• Backup overcurrent protection
• Fault recording
• Metering
• IEC 61850 communication
• Remote SCADA control

The main line protection may be provided by a separate SIPROTEC distance or line differential relay.

The 6MD86 can exchange trip, blocking, breaker-failure and automatic-reclosing information with the protection relay through hardwired contacts or IEC 61850 GOOSE.

Siemens 6MD86 and 6MD85 Difference

The Siemens 6MD85 and 6MD86 are both SIPROTEC 5 bay controllers, but the 6MD86 is generally selected for more complex control arrangements.

The main differences include:

• Siemens 6MD85: Commonly used for medium-voltage and high-voltage bay-control applications
• Siemens 6MD86: Intended for medium-voltage through extra-high-voltage systems and larger transmission schemes
• 6MD85 measuring inputs: Standard arrangements generally use four current and four voltage inputs
• 6MD86 measuring inputs: Configurations with up to eight current and eight voltage inputs are available
• 6MD86 switching scope: Can control up to 20 switching devices
• 6MD86 applications: Double-busbar, breaker-and-a-half and extra-high-voltage arrangements
• 6MD86 special functions: Point-on-wave switching and larger I/O structures are available

The correct model should be selected from the single-line diagram, number of switching devices, measuring circuits, protection functions and I/O requirement.

A 6MD85 should not be replaced with a 6MD86, or a 6MD86 with a 6MD85, without comparing the complete hardware and DIGSI 5 configuration.

Selecting the Correct Siemens SIPROTEC 6MD86

The model name 6MD86 does not identify one fixed device.

The complete order code determines the device hardware, measuring inputs, I/O quantity, housing, display, power supply and communication modules.

For an accurate quotation, provide:

• Complete Siemens 6MD86 order code
• Required quantity
• Destination country
• Device-label photograph
• Substation single-line diagram
• System voltage
• System frequency
• Bay type
• Busbar arrangement
• Number of circuit breakers
• Number of disconnectors
• Number of earthing switches
• Number of controlled switching devices
• Current-transformer ratios
• Voltage-transformer ratios
• Required current inputs
• Required voltage inputs
• Required binary inputs
• Required binary outputs
• Protection functions
• Synchrocheck requirement
• Automatic reclosing requirement
• Circuit-breaker failure requirement
• Point-on-wave switching requirement
• PMU requirement
• Arc-protection requirement
• Display and housing type
• Flush or surface mounting
• Auxiliary supply voltage
• Standard or redundant power supply
• Communication protocol
• Fibre-optic or electrical interfaces
• IEC 61850 requirement
• PRP or HSR requirement
• Process-bus requirement
• Existing DIGSI 5 project file

For a direct replacement, the full order code and existing DIGSI configuration are particularly important.

Two Siemens 6MD86 units may look identical from the front but contain different measuring modules, I/O cards, communication ports and licensed functions.

Siemens SIPROTEC 6MD86 Replacement

For replacement of an existing Siemens 6MD86 Bay Controller, share:

• Full order code from the device label
• Serial number
• Firmware version
• Existing DIGSI 5 project
• Front and rear photographs
• Module and terminal photographs
• Auxiliary supply voltage
• Communication details
• Required quantity
• Destination country

Ordering only by the model name may result in incorrect hardware.

Where the original order code is no longer available in the same form, the new configuration must match the existing current inputs, voltage inputs, binary I/O, power supply, communication and functions.

Siemens SIPROTEC 6MD86 Supplier and Exporter in India

ARP IMPEX supplies Siemens SIPROTEC 6MD86 Bay Controllers for utilities, transmission substations, power plants, EPC contractors, switchgear manufacturers, panel builders, system integrators and industrial buyers.

We handle enquiries for Siemens 6MD86 high-voltage bay controllers, extra-high-voltage substation controllers, double-busbar bay control units, breaker-and-a-half controllers, point-on-wave switching devices and IEC 61850 substation automation systems.

Buyers looking for Siemens SIPROTEC 6MD86 price in India, Siemens 6MD86 Bay Controller supplier, Siemens 6MD86 exporter from India or replacement of an existing Siemens 6MD86 can send the complete order code for review.

The Siemens SIPROTEC 6MD86 price depends on the selected housing, current and voltage inputs, binary I/O, display, power supply, communication modules and activated functions.

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