Siemens SIPROTEC 5 7SY82 Universal Protection Relay

Siemens SIPROTEC 5 7SY82 Universal Protection Relay Suppliers,Exporters in India

ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 5 7SY82 Universal Protection Relays in India. We handle requirements for sensor-based medium-voltage switchgear, feeder protection panels, motor feeders, capacitor-bank panels, industrial substations and replacement of existing LPIT protection devices.

The Siemens 7SY82 is designed specifically for Low Power Instrument Transformers, commonly known as LPITs. Instead of using only conventional 1 A or 5 A current-transformer inputs, the relay connects to low-power current and voltage sensors used in modern air-insulated and gas-insulated switchgear.

Its universal LPIT input accepts different sensor technologies according to IEC 61869. These include Rogowski coils and inductive low-power sensors for current measurement, along with resistive and capacitive dividers for voltage measurement. The sensor method is configured through software, allowing one relay platform to work with several common LPIT designs.

The relay comes with eight LPIT inputs connected through four combined RJ45 ports. When combined current-and-voltage sensors are used, the first four ports can carry both measurements. Siemens also provides an optional adapter and test box for connecting separate current and voltage sensors and for secondary injection testing without disconnecting the LPIT measuring circuits.

The 7SY82 is not limited to one fixed application. Functions from the SIPROTEC 5 library can be selected according to the protected feeder. The relay can cover cable and line feeders, motor feeders and capacitor-bank applications. This helps switchgear manufacturers and industrial users reduce the number of relay and sensor variants they need to keep in stock.

For Siemens SIPROTEC 7SY82 price and availability, share the complete Siemens article number, function-point class, required quantity and destination country.

Why the 7SY82 Is Different

A conventional protection relay normally requires CT and VT inputs with fixed secondary ratings. The 7SY82 takes low-power signals directly from compatible sensors.

This arrangement can reduce the size and weight of the measuring equipment inside a medium-voltage panel. RJ45 sensor connections also reduce conventional terminal wiring and make the connection between the sensor and relay easier to manage.

LPIT sensor circuits do not produce the same dangerous open-circuit overvoltage associated with conventional current-transformer secondary circuits. One sensor ratio can also cover a wide primary-current operating range, depending on the selected LPIT.

The universal input can help with retrofit work as well. Siemens states that existing LPIT devices, including sensors from other manufacturers, can be accommodated in many cases, subject to sensor compatibility and the availability of the required sensor data.

Technical Specifications

• Brand: Siemens
• Product family: SIPROTEC 5
• Model: 7SY82
• Product type: Universal numerical protection relay
• Primary application: Protection and control of medium-voltage feeders
• Measuring technology: Low Power Instrument Transformers
• LPIT standard: IEC 61869
• Sensor inputs: Eight universal LPIT inputs
• Connections: Four combined RJ45 input ports
• Current sensors: Rogowski coils and inductive low-power current sensors
• Voltage sensors: Resistive and capacitive voltage dividers
• Temperature input: Available for applicable sensor-temperature compensation
• Tripping arrangement: Selective three-pole tripping
• Binary I/O version 1: 9 binary inputs and 9 binary outputs
• Binary I/O version 2: 21 binary inputs and 16 binary outputs
• Power supply: 24–250 V DC or 100–230 V AC
• Rated AC frequency: 50/60 Hz
• Operating-value accuracy: Class 0.2 for current and voltage values
• Engineering software: Siemens DIGSI 5
• Function upgrade: SIPROTEC Function Point Manager
• Sensor configuration: Sensor library or manual sensor-data entry
• Mounting: Protection and control panels for air- or gas-insulated switchgear

The final protection functions, binary contacts, communication interfaces, auxiliary supply and function-point budget depend on the complete Siemens ordering configuration.

Protection Functions

The Siemens SIPROTEC 7SY82 can be configured for functions such as:

• Directional phase overcurrent protection
• Non-directional phase overcurrent protection
• Directional earth-fault protection
• Non-directional earth-fault protection
• Sensitive detection of earth faults
• Earth-fault protection for isolated networks
• Earth-fault protection for compensated-neutral networks
• Undervoltage protection
• Overvoltage protection
• Underfrequency and overfrequency protection
• Rate-of-change-of-frequency protection
• Active- and reactive-power protection
• Motor load-jam protection
• Motor starting-time supervision
• Locked-rotor protection
• Restart-inhibit protection
• Feeder control and switchgear interlocking
• Selective three-pole short-circuit tripping

The application and the purchased function-point class determine the enabled package. Buyers should not assume that every function is active in every 7SY82 device.

Features

• Universal protection relay designed for LPIT sensors
• Supports common sensor types covered by IEC 61869
• Eight LPIT inputs are supplied as standard
• Four combined RJ45 connections reduce panel wiring
• Works with current, voltage and combined sensors
• Suitable for air-insulated and gas-insulated MV switchgear
• Protects cable feeders, overhead-line feeders and motor feeders
• Can be configured for capacitor-bank protection
• Directional and non-directional overcurrent functions
• Selective earth-fault detection for different neutral arrangements
• A wide primary-current range can be covered with one sensor ratio
• Sensor data can be loaded from the DIGSI 5 sensor library
• Unlisted compatible sensors can be entered manually
• Sensor-specific calibration data can be imported through the sensor ID
• Functions can be expanded through the Function Point Manager
• Optional adapter and test box simplify commissioning
• Secondary testing can be completed without opening the LPIT circuit
• Two binary input and output arrangements are available
• Suitable for new sensor-based panels and LPIT retrofit projects
• Reduces the number of relay and sensor variants required for different feeders
• Importing and Managing LPIT Sensor Data

DIGSI 5 contains default information for commonly used LPIT sensors. During engineering, the protection engineer can select the sensor type, after which the applicable sensor data is loaded into the relay configuration.

Where a sensor is not included in the standard database, its technical and calibration data can be entered manually. Siemens also supports importing manufacturer-provided calibration data through the sensor identification information.

This is important during relay replacement because the 7SY82 must be configured for the exact sensor technology and calibration values installed in the switchgear. Matching only the relay model is not enough.

Applications

Siemens SIPROTEC 5 7SY82 Universal Protection Relays are used for:

• Sensor-based medium-voltage switchgear
• Air-insulated switchgear panels
• Gas-insulated switchgear panels
• Incoming MV feeders
• Outgoing cable feeders
• Overhead-line feeders
• Industrial distribution feeders
• Motor feeders
• Pump and compressor motor panels
• Capacitor-bank feeders
• Renewable-energy incoming feeders
• Solar and wind power connections
• Industrial substations
• Utility distribution substations
• Compact secondary substations
• Infrastructure power-distribution systems
• Feeder protection with Rogowski-coil current sensors
• Protection panels using capacitive voltage sensors
• Protection panels using resistive voltage dividers
• Existing LPIT relay replacement
• Conversion from conventional instrument transformers to LPIT technology
• Switchgear standardisation and panel modernisation

The 7SY82 is particularly useful for switchgear manufacturers building different feeder types around a common sensor and relay platform. Industrial users can also add motor, frequency or other functions when the feeder duty changes, subject to the available hardware and function-point licence.

7SY82 and Conventional Protection Relays

The 7SY82 should not be offered as a direct alternative to every conventional CT/VT protection relay.
The main difference is the measuring-input arrangement:

• Conventional relay: Uses standard CT and VT secondary signals
• SIPROTEC 7SY82: Uses low-power current and voltage sensor signals

Before selecting the 7SY82, the switchgear must already have compatible LPIT sensors, or the project must include the installation of suitable sensors. A conventional 1 A or 5 A CT cannot normally be connected directly to the universal LPIT ports.

For installations using standard current and voltage transformers, another SIPROTEC model such as the 7SJ82, 7SX82 or 7SX85 may be more appropriate, depending on the required protection functions.

Information Required for Quotation

For an exact Siemens 7SY82 quotation, send:

• Complete Siemens MLFB or article number
• Required quantity
• Destination country
• Required protection application
• Function-point class, where specified
• Required communication protocol
• For replacement requirements, also share:
• Photograph of the existing relay nameplate
• Sensor manufacturer and model
• Sensor serial number or calibration data
• Current-sensor technology
• Voltage-sensor technology
• Binary input and output requirements
• Existing DIGSI 5 project file, where available

If the article number is unavailable, confirm whether the requirement is for a cable feeder, line feeder, motor feeder or capacitor-bank panel.

Siemens SIPROTEC 5 7SY82 Supplier and Exporter in India

ARP IMPEX supplies Siemens SIPROTEC 5 7SY82 Universal Protection Relays for medium-voltage switchgear manufacturers, utilities, EPC contractors, panel builders, industrial plants and infrastructure projects.

We handle enquiries for Siemens 7SY82 LPIT protection relays, relays for Rogowski-coil current sensors, sensor-based feeder protection, universal relays for gas-insulated switchgear and replacement of existing LPIT protection devices.

The Siemens SIPROTEC 7SY82 price depends on the full article number, binary I/O version, function-point class, communication requirement and ordered quantity.

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