Siemens SIPROTEC 5 7VK87 Circuit-Breaker Management Relay

Siemens SIPROTEC 5 7VK87 Circuit-Breaker Management Relay Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 5 7VK87 Circuit-Breaker Management Devices in India. We handle requirements for transmission substations, breaker-and-a-half schemes, power plants, industrial switchyards, protection-panel upgrades and replacement of existing Siemens devices.

The Siemens SIPROTEC 7VK87 is not a conventional feeder protection relay. It is designed mainly to manage the circuit breaker before, during and after a protection trip. Its main duties include automatic reclosing, synchrocheck and circuit-breaker failure protection.

After a line protection relay trips the breaker, the 7VK87 can supervise the reclosing sequence and check whether the electrical conditions on both sides of the breaker permit safe closing. If the breaker does not clear the fault after receiving a trip command, the breaker-failure function can initiate backup tripping of the surrounding breakers.

The device supports one-pole and three-pole breaker-management schemes. This makes it useful for high-voltage overhead lines where the protection system may trip and reclose only the affected phase, as well as for applications that always operate all three poles together.

The 7VK87 is also commonly considered for breaker-and-a-half substations, synchronising duties and switchgear control. Depending on the ordered function package, it can supervise circuit-breaker wear, detect breaker restrikes, carry out point-on-wave switching and provide additional voltage, frequency or overcurrent protection.

Its modular SIPROTEC 5 hardware allows the number of current inputs, voltage inputs, binary contacts and communication interfaces to match the protection-panel design. This is useful where several breaker poles, trip coils, disconnectors, interlocks and alarm circuits must be handled within one device.

For Siemens SIPROTEC 7VK87 price and availability, send the complete Siemens article number, required quantity and destination country.

Where the 7VK87 Fits in a Protection Scheme

The main line, transformer or busbar relay detects the electrical fault. The 7VK87 then handles breaker-related operations required by the protection scheme.

A typical arrangement may include:

• Reclosing the breaker after a temporary overhead-line fault
• Checking voltage, frequency and phase angle before closing
• Tripping adjacent breakers if the selected breaker fails to open
• Supervising one-pole and three-pole breaker operations
• Checking the trip circuit and breaker operating condition
• Controlling switching operations from the panel or station system
• Recording breaker trips, closing commands and abnormal operations

This separation is useful in large substations where breaker-management functions need dedicated hardware, more binary contacts or independent backup logic.

Technical Specifications

• Brand: Siemens
• Product family: SIPROTEC 5
• Model: 7VK87
• Product type: Modular circuit-breaker management device
• Main functions: Automatic reclosing, synchrocheck and breaker-failure protection
• Tripping arrangement: One-pole and three-pole, or three-pole only
• Main applications: Line breakers, bus couplers and substation switching schemes
• Standard hardware options: Twelve predefined variants
• Analogue inputs: 4 CT/4 VT or 8 CT/8 VT arrangements
• Binary inputs: 5 to 31, depending on the hardware version
• Binary outputs: 8 to 46, depending on the hardware version
• I/O expansion: Available through SIPROTEC 5 expansion modules
• Housing width: From one-third to two full 19-inch rack widths
• Display options: Small display, large display or no display
• Power supply: Standard or redundant supply options
• Engineering software: Siemens DIGSI 5
• Communication: Integrated Ethernet with optional plug-in modules
• Communication expansion: Up to four communication modules
• IEC 61850: Reporting, GOOSE and process-bus options
• Network redundancy: PRP, HSR and RSTP on applicable configurations
• Environmental protection: Conformal-coated electronic modules
• Operating temperature: Extended range up to approximately +70°C

The precise measuring inputs, binary contacts, display, power supply, communication ports and enabled functions depend on the complete Siemens MLFB.

Main Functions

Depending on the selected configuration, the Siemens SIPROTEC 7VK87 can provide:

• One-pole and three-pole automatic reclosing
• Synchrocheck before circuit-breaker closing
• Manual generator synchronisation
• One-pole and three-pole circuit-breaker failure protection
• Switch-onto-fault tripping
• Instantaneous high-current tripping
• Trip-circuit supervision
• Breaker control and switchgear interlocking
• Lockout functions
• Circuit-breaker restrike protection
• Circuit-breaker wear monitoring
• Voltage and frequency supervision
• Directional and non-directional overcurrent protection
• Underfrequency load shedding
• Fault-location functions
• Point-on-wave switching
• Arc protection through optional sensor modules
• Programmable control and automation logic

Not every 7VK87 includes all these functions. Automatic reclosing, protection stages, arc sensors, process-bus communication and breaker-monitoring functions must be confirmed from the ordered device configuration.

Features

• Dedicated management of circuit-breaker tripping and closing operations
• Supports one-pole and three-pole breaker schemes
• Automatic reclosing for overhead-line protection applications
• Synchrocheck prevents closing under unsuitable system conditions
• Breaker-failure protection provides backup tripping
• Suitable for breaker-and-a-half substation arrangements
• Can be used for manual generator synchronising
• A high number of binary inputs and outputs for complex panels
• Modular hardware supports future panel expansion
• Redundant power-supply option available
• Optional breaker-wear monitoring supports maintenance planning
• Optional restrike protection monitors abnormal breaker interruption
• Point-on-wave switching can reduce switching stress in applicable installations
• Arc-protection modules can be added where required
• DIGSI 5 supports configuration, logic and commissioning
• IEC 61850 supports station-bus and process-bus projects
• Up to four communication modules can be selected
• PRP and HSR options support redundant Ethernet networks
• Fault and disturbance records help review breaker operations
• Conformal-coated electronics suit demanding substation environments

Siemens also provides cybersecurity functions such as role-based access control, security-event logging and authenticated network access on applicable configurations.

Automatic Reclosing and Synchrocheck

Automatic reclosing is commonly used on overhead transmission lines because many line faults are temporary. After the protection relay clears the fault, the 7VK87 can wait for the selected dead time and issue a closing command.

Before closing, the synchrocheck function can compare the voltages on both sides of the breaker. It checks whether the phase-angle, frequency and voltage differences remain within the permitted limits.

For phase-selective line schemes, the device can handle one-pole reclosing. Three-pole reclosing is available for line and system arrangements where all poles must operate together.

Circuit-Breaker Failure Protection

A circuit breaker may receive a trip command but fail to interrupt the fault current because of a mechanical, electrical or trip-circuit problem.

The 7VK87 can monitor whether the current disappears and whether the breaker position changes within the permitted operating time. If the breaker does not clear the fault, the device can initiate backup tripping of the adjacent breakers.

This function is important in transmission substations and power plants because a failed breaker can leave the fault connected to the system and expose other equipment to continued short-circuit current.

Applications

Siemens SIPROTEC 5 7VK87 Circuit-Breaker Management Devices are used for:

• High-voltage transmission-line breakers
• Extra-high-voltage substations
• Breaker-and-a-half switchgear schemes
• Double-breaker substations
• Bus-coupler and bus-section breakers
• Overhead-line automatic reclosing
• One-pole reclosing schemes
• Three-pole reclosing schemes
• Circuit-breaker failure protection
• Synchrocheck before line energisation
• Manual generator synchronisation
• Generator circuit breakers
• Transformer feeder breakers
• Utility transmission substations
• Power-generation switchyards
• Industrial power-distribution systems
• Captive power plants
• Renewable-energy grid connections
• Substation control and interlocking
• IEC 61850 digital substations
• Protection-panel modernisation
• Replacement of older Siemens breaker-management relays

The 7VK87 is especially relevant where breaker control, reclosing, synchrocheck and breaker-failure protection require more dedicated hardware and logic than the main line or transformer relay can provide.

7VK87 and a Standard Protection Relay

A standard line, feeder or transformer relay mainly detects faults in the protected equipment.

The 7VK87 focuses on the circuit breaker and the switching sequence that follows the fault. It can work alongside:

• Distance protection relays
• Line differential protection relays
• Transformer differential relays
• Busbar protection systems
• Generator protection relays

Some SIPROTEC relays already include basic reclosing and breaker-failure functions. A separate 7VK87 is generally selected where the project needs dedicated breaker management, independent backup, additional binary I/O or complex one-pole and three-pole operating logic.

Information Required for Quotation

“Siemens SIPROTEC 7VK87” does not identify a standard hardware arrangement. Siemens supplies several configurations with different analogue inputs, binary contacts, housing sizes and communication modules.

For an accurate quotation, share:

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

For replacement enquiries, also send clear photographs of the existing device nameplate, front display and rear terminals.

If the article number is unavailable, share the existing device model and confirm whether the requirement includes:

• One-pole or three-pole reclosing
• Breaker-failure protection
• Synchrocheck
• Breaker-and-a-half control
• Generator synchronisation
• Point-on-wave switching
• IEC 61850 communication

Siemens SIPROTEC 5 7VK87 Supplier and Exporter in India

ARP IMPEX supplies Siemens SIPROTEC 5 7VK87 Circuit-Breaker Management Devices for utilities, transmission companies, EPC contractors, power plants, switchgear manufacturers and protection-panel builders.

We handle enquiries for Siemens 7VK87 automatic reclosing devices, synchrocheck relays, breaker-failure protection devices, one-pole breaker management, breaker-and-a-half applications and replacement of existing Siemens SIPROTEC equipment.

The Siemens SIPROTEC 7VK87 price depends on the complete article number, analogue inputs, binary I/O arrangement, housing size, power supply, communication modules, enabled functions and required quantity.

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