Siemens Siprotec 4 7SJ66 is a multifunction protection numerical relay designed to protect electrical power systems from various faults and abnormal conditions. This relay provides comprehensive protection for feeders, motors, transformers, and generators by measuring various electrical parameters, including voltage, current, frequency, and phase angle. In addition to protection functions, the 7SJ66 relay also offers advanced monitoring and control capabilities, making it a versatile solution for modern power systems. In this blog, we will explore the working principle of Siemens 7SJ66 relay and discuss its key features and benefits.

SIPROTEC 4 is the industry leader in uniting protection, control, measurement, and automation tasks. Due to its distinctive characteristics, such as its unified system platform, the DIGSI 4 engineering program, and the vast experience of more than one million successfully working devices around the world, SIPROTEC 4 is highly regarded by users everywhere. The current de facto industry standard for digital protection technology across all application areas is SIPROTEC 4.

Applications Of Siemens 7SJ66 Protection Relay

Line and feeder protection: 

High- and medium-voltage networks are protected by neutral points that are earthed (grounded), low-resistance grounded, isolated, or compensated.

Motor Protection: 

Suitable for asynchronous machines of all sizes

Backup Protection: 

All backup protection duties in addition to transformer differential protection are carried out by the relay.

Multifunctional protection SIPROTEC 7SJ66 Relay

• Overcurrent protection
• Directional overcurrent protection
• Sensitive directional ground-fault detection
• Intermittent ground-fault protection
• Directional intermittent ground fault protect
• High-impedance restricted ground fault
• Under-/overvoltage protection
• Under-/overfrequency protection
• Rate-of-frequency-change protection
• Undervoltage-controlled reactive power protection
• Breaker failure protection
• Negative-sequence protection
• Phase-sequence monitoring

Control functions/programmable logic

• Commands for control of CB and isolators
• Graphical visualization of switch positions
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• User-defined logic with CFC (e.g. interlocking)

Monitoring functions

• Operational measured values V, I, f
• Energy metering values Wp,Wq
• Circuit-breaker wear monitoring
• Slave pointer
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records with a sampling rate of 1.6 kHz
• Motor statistics
• Security log

Languages

English, Spanish, Russian, Polish and Turkish

Essential Features For Siemens 7SJ66 Numerical Relay

Hardware

• Spring-type terminals
• 4 current transformers
• 4 voltage transformers
• 16 to 36 binary inputs
• 7 to 23 output relays
• Graphic or 8 line display
• Communication interfaces

System port:

– DNP TCP

– IEC 61850

– IEC 60870-5-103

– Modbus RTU

– DNP3

Electrical and optical interface

RSTP (Redundancy Protocol for Ethernet)

Service interface for DIGSI 4 or RTD-Box

Front USB interface for DIGSI 4

Time synchronization via IRIG B, DCF77

Conclusion

In conclusion, the Siemens SIPROTEC 7SJ66 multifunction protection numerical relay is an advanced device that offers numerous protective functions for electrical power systems. It operates by continuously monitoring the system parameters such as voltage, current, frequency, and phase angle, and triggers appropriate actions when it detects abnormalities or faults. The relay can be configured to provide a wide range of protection functions, including overcurrent, under/overvoltage, over/underfrequency, directional overcurrent, breaker failure, and many more. Its numerical technology provides high accuracy and speed, making it an ideal solution for complex power systems. With its advanced features and reliable performance, the Siemens 7SJ66 is an excellent choice for power system protection and control.

We Reliserv Solution are the leading Siemens Siprotec products supplier, and exporter in Mumbai, Maharashtra. Contact Reliserv Solution today to get the best price on Siemens Siprotec 4 7SJ66 multifunction protection numerical relay.  Reliserv Solution is the Authorized  Supplier & Channel Partner of SIEMENS Make Numerical Relays, Automation Products, Power Quality Meters & Instruments, MV Switchgear Spares, and PSS SINCAL Software. Additionally, we offer a variety of services and specialized solutions for industries and panel builders. Contact us at +917506112097 or mail us your requirements at [email protected] We deal in a wide range of products in Siemens, to learn more about our Siemens Siprotec 4 Relays click here.

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