Siemens Reyrolle 7SR158 Voltage and Frequency Protection Relay
ARP IMPEX is a supplier and exporter of Siemens Reyrolle 7SR158 Voltage and Frequency Protection Relays in India. We handle requirements for generator panels, industrial substations, renewable-energy projects, load-shedding systems, protection-panel upgrades and replacement of existing Reyrolle relays.
The Siemens Reyrolle 7SR158 monitors the voltage and frequency of an electrical network. It can generate an alarm, operate a circuit breaker or initiate control logic when the measured values move outside the selected limits.
The relay is commonly used for undervoltage, overvoltage, underfrequency and overfrequency protection. Applicable models also support rate-of-change-of-frequency and vector-shift functions for loss-of-mains and islanding protection.
These functions are useful in generating plants, captive power systems and renewable-energy installations operating in parallel with a utility supply. The relay can detect an abnormal network condition and disconnect the generator or operate the required protection scheme.
The 7SR158 is also used in underfrequency load-shedding systems. When the system frequency drops, selected non-essential loads can be disconnected in stages to reduce demand and help stabilise the network.
Different relay versions are available with varying protection functions and communication interfaces. The complete Siemens article number should therefore be checked before quotation.
Buyers searching for a Siemens Reyrolle 7SR158 supplier in India, an underfrequency load-shedding relay, or a loss-of-mains protection relay with ROCOF can share the complete part number for price and availability.
Technical Specifications
- Brand: Siemens
- Product family: Reyrolle Argus
- Series: 7SR158
- Product type: Numerical voltage and frequency protection relay
- Main use: Voltage, frequency and loss-of-mains protection
- Voltage inputs: Three VT inputs
- Rated frequency: 50/60 Hz
- Auxiliary supply: AC or DC, depending on the ordering code
- Setting groups: Multiple setting groups
- Display: Front backlit LCD
- Indication: 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
- Control: Circuit-breaker control and programmable logic
- Mounting: Flush mounting in protection and switchgear panels
The exact auxiliary supply, binary contacts, protection functions and communication arrangement depend on the complete Siemens ordering code.
Main Protection Functions
Depending on the selected Siemens Reyrolle 7SR158 model, the relay can provide:
- Undervoltage protection
- Overvoltage protection
- Underfrequency protection
- Overfrequency protection
- Rate-of-change-of-frequency protection
- Voltage vector-shift protection
- Negative-sequence voltage protection
- Neutral-voltage-displacement protection
- Trip-circuit supervision
- Protection lockout
- Circuit-breaker control
- Programmable control logic
ROCOF and vector-shift functions are available only on applicable configurations and should be confirmed from the Siemens part number.
Features
- Monitors abnormal voltage and frequency conditions
- Suitable for generator, feeder and bus-voltage protection
- Provides separate alarm and trip stages
- Supports underfrequency load-shedding schemes
- Can be used for loss-of-mains and islanding protection
- ROCOF protection is available on selected models
- Vector-shift protection is available on applicable versions
- Programmable logic supports load shedding and restoration schemes
- Multiple setting groups suit changing operating conditions
- Circuit-breaker control can be included within the relay logic
- Front display shows voltage, frequency, alarms and trip information
- Programmable LEDs provide a clear local status indication
- Fault and waveform records help investigate system disturbances
- USB and RS485 support commissioning and remote monitoring
- IEC 61850 options support modern substation automation systems
- Suitable for new panels, retrofit projects and relay replacement
Applications
Siemens Reyrolle 7SR158 Voltage and Frequency Relays are commonly used for:
- Generator protection panels
- Underfrequency load-shedding systems
- Overfrequency protection
- Loss-of-mains protection
- Islanding detection
- Captive power plants
- Utility substations
- Industrial substations
- Solar power plants
- Wind power projects
- Distributed-generation systems
- Bus-voltage monitoring
- Incoming feeder panels
- Automatic transfer schemes
- Load restoration schemes
- Industrial power-management systems
- Protection-panel retrofit projects
- Replacement of existing voltage and frequency relays
The relay suits commercial searches such as Siemens voltage and frequency relay for generator panels, 7SR158 relay for underfrequency load shedding, loss-of-mains relay with ROCOF protection, and Reyrolle voltage relay with IEC 61850 communication.
Selecting the Correct Siemens 7SR158 Relay
The description “Reyrolle 7SR158” does not identify the complete relay configuration. Models may differ by protection functions, auxiliary supply, binary contacts and communication interface.
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 article number is unavailable, the existing relay details, auxiliary supply and required protection functions can help identify the suitable configuration.
Siemens Reyrolle 7SR158 Supplier and Exporter in India
ARP IMPEX supplies Siemens Reyrolle 7SR158 Voltage and Frequency Protection Relays for switchgear manufacturers, EPC contractors, panel builders, utilities, power plants and industrial maintenance companies.
We handle enquiries for:
- Siemens Reyrolle 7SR158 Voltage and Frequency Relays
- Underfrequency load-shedding relays
- Overvoltage and undervoltage protection relays
- Generator frequency protection relays
- Loss-of-mains protection relays
- ROCOF protection relays
- Voltage vector-shift relays
- Reyrolle relays with RS485 communication
- Voltage protection relays with IEC 61850
- Replacement Siemens Argus relays
- Protection-panel retrofit requirements
The Siemens Reyrolle 7SR158 price depends on the complete article number, protection functions, communication interface and ordered quantity.
Send the complete Siemens part number, required quantity and destination country for price, availability and export quotation.
