Siemens SIPROTEC 5 7UM85 Generator Protection Relay

Siemens SIPROTEC 5 7UM85 Generator Protection Relay Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 5 7UM85 Generator Protection Relays in India. We handle requirements for power plants, captive generation units, hydro stations, generator control panels, plant modernisation and replacement of existing Siemens protection relays.

The Siemens 7UM85 is built for the protection and monitoring of generators and complete power-generation units. It can be configured for small generating machines as well as large utility generators. Apart from the generator, the relay can cover the generator transformer, auxiliary system and connected busbar functions when the approved protection scheme requires them.

A generator may face internal winding faults, loss of excitation, reverse power, abnormal frequency, unbalanced loading, overheating or accidental energisation. The 7UM85 brings the required protection functions into one modular device, instead of relying on several separate relays for each condition.

For a generator connected directly to a busbar, the relay can provide generator protection with directional stator earth-fault protection. In a generator-transformer unit, one suitably configured 7UM85 can handle protection for both the generator and its step-up transformer. Larger and more complex power units may use the 7UM85 together with other SIPROTEC 5 devices.

The same platform can also protect synchronous motors and synchronous condensers. This is useful in hydro plants where the machine may operate as a generator at one time and as a motor during pumping operation.

Siemens offers the 7UM85 with modular hardware. Current inputs, voltage inputs, binary contacts, displays and communication modules can be selected according to the generator-protection panel. For Siemens SIPROTEC 7UM85 price and availability, share the complete Siemens article number, required quantity and destination country.

Technical Specifications

• Brand: Siemens
• Product family: SIPROTEC 5
• Model: 7UM85
• Product type: Modular generator protection relay
• Main use: Protection, control and monitoring of generators and power units
• Generator range: Generators of different sizes and ratings
• Standard hardware: Five predefined input/output variants
• Current inputs: Up to 16 CT inputs
• Voltage inputs: Up to 8 VT inputs
• Binary inputs: 7 to 15 in predefined standard variants
• Binary outputs: 9 to 20 in predefined standard variants
• Fast measuring inputs: Up to four 10 V or 20 mA transducer inputs
• I/O expansion: Additional SIPROTEC 5 expansion modules can be fitted
• Display options: Large display, small display or no display
• Housing width: From one-third to two full 19-inch rack widths
• 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 support
• Network redundancy: PRP and HSR on applicable configurations
• Recording: Event, fault and disturbance recording
• Power monitoring: Basic power-quality and PMU functions on applicable versions
• Board protection: Conformal-coated electronic modules

The exact CT and VT inputs, binary contacts, housing size, display, communication ports and enabled protection functions depend on the complete Siemens MLFB.

Generator Protection Functions

The Siemens SIPROTEC 7UM85 can be configured with functions such as:

• Generator differential protection
• Transformer differential protection
• Phase and earth overcurrent protection
• Impedance protection
• Stator earth-fault protection
• 100% stator earth-fault protection on applicable schemes
• Rotor earth-fault protection
• Underexcitation protection
• Overexcitation protection
• Reverse-power protection
• Unbalanced-load protection
• Thermal overload protection
• Undervoltage and overvoltage protection
• Underfrequency and overfrequency protection
• Frequency-change protection
• Inadvertent energisation protection
• Circuit-breaker failure protection
• Circuit-breaker re-ignition monitoring
• Network decoupling protection
• Synchronising and paralleling functions

The protection package should be confirmed based on the ordered configuration. A relay selected for a small generator may not have the same CT arrangement, differential zones or auxiliary functions as a 7UM85 intended for a large generator-transformer unit.

Features

• Covers generators ranging from smaller machines to large power-plant units
• Can combine generator and transformer protection in one configured relay
• Protects machines connected directly to a busbar or through a unit transformer
• Differential protection provides fast clearance of internal generator faults
• Stator and rotor earth-fault functions cover important machine insulation failures
• Reverse-power protection helps detect motoring of the generator
• Underexcitation and overexcitation functions protect the machine during abnormal excitation conditions
• Unbalanced-load protection detects damaging negative-sequence current
• Temperature supervision can work through an external RTD unit
• Frequency protection supports generator and turbine operating limits
• Inadvertent energisation protection detects incorrect breaker closing onto a stationary machine
• Synchronising functions can control voltage and speed correction before the breaker closes
• Modular hardware suits different generator-panel arrangements
• DIGSI 5 supports settings, logic, testing and commissioning
• IEC 61850 supports connection with plant and substation control systems
• Fault records help engineers review generator trips and abnormal operation
• PMU and power-quality functions are available on applicable configurations
• Conformal coating supports use in demanding power-plant environments
• Suitable for new generator panels, upgrades and replacement projects

Where the 7UM85 Is Commonly Used

The 7UM85 is not limited to one type of power station. It can be configured around the actual generator connection and the protection philosophy followed by the plant.

Generator Connected to a Busbar

For generators connected directly to the station busbar, the relay can provide the main generator-protection functions along with directional stator earth-fault protection.

Generator-Transformer Unit

In a unit-connected scheme, the relay can protect both the generator and the generator transformer. This can reduce the number of separate devices required in the protection panel, depending on the approved scheme.

Larger Power Units

A larger unit may have a generator circuit breaker, several auxiliary transformers and separate protection groups. In this case, the 7UM85 can work together with Siemens transformer, feeder or line protection relays.

Generator and Motor Operation

Hydro machines used for pumped-storage operation may run as a generator and as a motor. The 7UM85 supports generator and motor protection functions for such applications.

Applications

Siemens SIPROTEC 5 7UM85 Generator Protection Relays are used for:

• Steam turbine generators
• Gas turbine generator units
• Hydro generators
• Pumped-storage hydro machines
• Synchronous generators
• Synchronous motors
• Synchronous condensers
• Generator-transformer units
• Generators connected directly to a busbar
• Thermal power plants
• Hydroelectric power stations
• Combined-cycle power plants
• Captive power plants
• Industrial cogeneration units
• Utility generation stations
• Generator auxiliary systems
• Generator step-up transformer protection
• Busbar-connected generating units
• Power-plant modernisation projects
• Replacement of older Siemens generator relays

The 7UM85 is particularly relevant where the plant needs generator differential protection, stator and rotor earth-fault protection, reverse-power protection and synchronising functions within one modular SIPROTEC 5 platform.

Siemens 7UM62 Replacement and Plant Upgrades

Many Siemens generator-protection enquiries are for existing power plants rather than new installations. An older SIPROTEC 4 relay, such as the 7UM62, should not be replaced simply by choosing the newer model name.

The replacement assessment should cover:

• Existing Siemens article number
• Generator and transformer arrangement
• CT and VT input requirements
• Protection zones
• Auxiliary supply
• Binary input and output allocation
• Trip and alarm logic
• Communication protocol
• Existing DIGSI files
• Available panel space
• Required coupling units for earth-fault protection

Moving from an older generator relay to the SIPROTEC 7UM85 may require panel changes, revised settings, communication updates and fresh protection testing. The 7UM85 also works with dedicated Siemens coupling units for certain rotor and stator earth-fault protection methods.

Information Required for Quotation

For an accurate Siemens 7UM85 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 relay nameplate and rear terminals.

If the Siemens article number is unavailable, share the existing relay model and confirm whether the requirement is for a generator only or a complete generator-transformer unit.

Siemens SIPROTEC 5 7UM85 Supplier and Exporter in India

ARP IMPEX supplies Siemens SIPROTEC 5 7UM85 Generator Protection Relays for power plants, utilities, EPC contractors, generator panel builders and industrial maintenance companies.

We handle enquiries for Siemens 7UM85 generator differential relays, generator-transformer protection relays, reverse-power protection, stator earth-fault protection, synchronous machine protection and replacement of existing Siemens generator relays.

The Siemens SIPROTEC 7UM85 price depends on the complete article number, generator-protection functions, analogue inputs, binary I/O, communication modules, housing arrangement and ordered quantity.

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