Siemens Reyrolle 7SR242 Duobias Transformer Differential Protection Relay
Siemens Reyrolle 7SR242 Duobias Transformer Differential Protection Relay Suppliers,Exporters in India
ARP IMPEX is a supplier and exporter of Siemens Reyrolle 7SR242 Duobias Transformer Differential Protection Relays in India. We handle requirements for utility substations, industrial power systems, transformer protection panels, maintenance projects and replacement of existing differential relays.
The Siemens Reyrolle 7SR242 is mainly used for the protection of two-winding transformers. It compares the current on both sides of the transformer and operates when it detects an internal fault within the protected area.
The relay supports different transformer vector groups and earthing arrangements. It can compensate for transformer ratio and phase differences through its settings, which reduces the need for additional interposing CT arrangements in many applications.
Transformer energisation can produce a high inrush current that may look similar to an internal fault. The 7SR242 uses harmonic restraint to keep the differential protection stable during normal transformer energisation while still providing fast operation for genuine internal faults.
Along with transformer differential protection, the relay can provide restricted earth-fault, overcurrent, earth-fault, thermal overload and circuit-breaker supervision functions. Different versions are available with varying binary contacts, case sizes and communication interfaces.
The Siemens article number should be checked before quotation because the description “7SR242 relay” does not identify the complete hardware configuration.
Buyers looking for a Siemens Reyrolle 7SR242 supplier in India, a Duobias transformer differential relay exporter, or a replacement transformer protection relay with IEC 61850 can share the complete part number for price and availability.
Technical Specifications
- Brand: Siemens
- Product family: Reyrolle Duobias
- Series: 7SR242
- Product type: Numerical transformer differential protection relay
- Main application: Protection of two-winding transformers
- Additional use: Selected autotransformer and reactor protection schemes
- Current inputs: Six phase-current inputs and two earth-current inputs
- CT secondary rating: 1 A or 5 A
- Rated frequency: 50/60 Hz
- Protection principle: Biased transformer differential protection
- Inrush restraint: Harmonic restraint for transformer energisation
- Auxiliary supply: AC or DC, depending on the ordering code
- Setting groups: Multiple setting groups
- Display: Front LCD
- Indication: Fixed and programmable LEDs
- Local communication: Front USB
- Remote communication: RS485 on applicable models
- Ethernet communication: Available on selected configurations
- IEC 61850: Available on applicable Ethernet versions
- Configuration software: Siemens Reydisp
- Recording: Fault, event and waveform records
- Mounting: Flush mounting in transformer protection panels
The exact binary inputs, output contacts, auxiliary supply and communication arrangement depend on the complete Siemens ordering code.
Main Protection Functions
Depending on the selected configuration, the Siemens Reyrolle 7SR242 can provide:
- Biased transformer differential protection
- High-set differential protection
- Transformer inrush restraint
- Restricted earth-fault protection
- Phase overcurrent protection
- Earth-fault backup protection
- Thermal overload protection
- Overfluxing protection
- Negative-phase-sequence protection
- Circuit-breaker failure protection
- Trip- and close-circuit supervision
The main protection package combines differential protection for internal transformer faults with backup protection for abnormal current and earth-fault conditions.
Features
- Combines transformer differential and backup protection in one relay
- Suitable for two-winding transformers with different vector groups
- Compensates for transformer ratio and phase-angle differences through relay settings
- Harmonic restraint helps prevent unnecessary trips during transformer energisation
- High-set differential protection provides fast operation for severe internal faults
- Restricted earth-fault protection can detect faults close to the transformer neutral
- Overcurrent and earth-fault functions provide backup protection
- Overfluxing protection monitors excessive voltage-to-frequency conditions
- Multiple setting groups suit different transformer operating arrangements
- Programmable logic supports panel control and interlocking requirements
- Front display shows current values, alarms and trip information
- Programmable LEDs provide a clear local indication
- Fault and waveform records support post-trip investigation
- USB and RS485 simplify configuration and remote monitoring
- IEC 61850 options support integration with substation automation systems
- Suitable for new transformer panels, retrofit work and relay replacement projects
Applications
Siemens Reyrolle 7SR242 Transformer Differential Protection Relays are commonly used for:
- Two-winding power transformers
- Distribution transformers
- Industrial transformers
- Utility substations
- Industrial substations
- Power-generation plants
- Captive power systems
- Incoming transformer panels
- Transformer control and relay panels
- Oil and gas facilities
- Refineries and petrochemical plants
- Steel and cement plants
- Mining and mineral-processing facilities
- Renewable-energy substations
- Railway power-distribution systems
- Transformer retrofit projects
- Replacement of older transformer differential relays
- Selected autotransformer and reactor applications
The range is relevant for searches such as Siemens transformer differential relay for two-winding transformers, Reyrolle 7SR242 relay with IEC 61850, Duobias relay for transformer internal fault protection, and transformer differential relay supplier and exporter in India.
Selecting the Correct Siemens 7SR242 Relay
The safest way to identify the required 7SR242 configuration is through the complete Siemens article number.
For an accurate quotation, share:
- Complete Siemens article number
- Required quantity
- Destination country
- Required communication interface, where applicable
For replacement enquiries, also share a clear photograph of the existing relay nameplate and rear terminal arrangement.
Where the part number is not available, the existing relay details, transformer vector group, CT ratios, auxiliary supply and communication requirement can help identify the suitable configuration.
Siemens Reyrolle 7SR242 Supplier and Exporter in India
ARP IMPEX supplies Siemens Reyrolle 7SR242 Duobias Transformer Protection Relays for switchgear manufacturers, EPC contractors, panel builders, utilities and industrial maintenance companies.
We handle enquiries for:
- Siemens Reyrolle 7SR242 transformer protection relays
- Duobias transformer differential relays
- Differential relays for two-winding transformers
- Transformer relays with restricted earth-fault protection
- Reyrolle relays with RS485 communication
- Transformer protection relays with IEC 61850
- Replacement Siemens Duobias relays
- Transformer protection-panel retrofit requirements
- Industrial and utility substation projects
The Siemens Reyrolle 7SR242 price depends on the complete article number, binary I/O arrangement, auxiliary supply, communication interface and ordered quantity.
Send the complete Siemens part number, required quantity and destination country for price, availability and export quotation.
