7SR45 Self Powered Overcurrent Protection Relay
- 2. Description • The 7SR45 Argus Self Powered/Dual Powered NonDirectional Overcurrent and Earth Fault Relay is developed using the latest generation of hardware technology and is available in multiple variants depending on the Current Transformer (CT), binary input/binary output, power supply, and communication configuration. 7SR45 is a member of Siemens Reyrolle® protection devices Argus product family. • The 7SR45 Argus Self Powered/Dual Powered NonDirectional Overcurrent and Earth Fault Relay is housed either in a 4U high, size 4 or height reduced non draw- out case and provides protection, monitoring, instrumentation, and metering with integrated input and output logic and fault reports. • The relay functionality can be configured via a front USB port for local PC connection or rear electrical RS485 (optional) port for remote connection. By using the Reydisp Evolution software, the user can update the settings and view the fault records (trip log) and the event records (event log). • 7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay supports the IEC 60870-5-103 and Modbus communication protocols. • 7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay can indicate the trip with local and remote flag indicator
- 3. Data Storage and Communication • Front USB port + Rear RS485 port (optional) • Protocols – IEC 60870-5-103, Modbus RTU • Fault Records (Trip Log) • Event Records (Event Log) • Time Synchronism • Viewing and Changing Settings • Battery Profiling MonitoringFunctions • Primary/Secondary Current Phases and Earth • Binary Input/Binary Output Status • Time and Date • Fault Records (Trip Log) • Event Records (Event Log) User Interface • 16 Character x 2 Line Backlit LCD • Menu Navigation Keys • 9 non-programmable LEDs • Local Flag Indicator
- 4. Application o 7SR45 Argus Self Powered/Dual Powered Relay is a numerical overcurrent and earth fault protection relay primarily intended for secondary distribution electrical networks. o The 7SR45 Argus Self Powered/Dual Powered NonDirectional Overcurrent and Earth Fault Relay is designed to operate with/without an auxiliary supply.The 7SR45 Dual Powered Non-Directional Overcurrent and Earth Fault relay is powered primarily from the auxiliary voltage even though all other power sources are available. o In the absence of auxiliary voltage, the relay is powered by CT input. o The relay offers definite-time and inverse-time overcurrent and earth fault protection functions in accordance to IEC and ANSI standards. o 7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay are built in with a capacitor discharge pulse output for low-energy trip coil of the circuit breaker. Changeover binary outputs are also available for trip via an auxiliary powered shunt trip coil o 7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay are targeted for the following applications: • Protection Relay for Ring Main Units (RMU) • Back up protection relay for the medium voltage applications • Protection applications in remote locations where auxiliary supply is not available
- 5. Functional Diagram 50/51 Phase Overcurrent Fault 50 INST/DTL and 51 IDMTL/DTL elements provide overcurrent protection, each with independent settings for pickup current, time- multiplier (51), and time-delays. User can select IEC or ANSI time current characteristics. 50G/51G/ 50N/51N Measured/Derived Earth Fault Two earth fault measurement modes are available. One mode directly measures the earth current from an independent CT (50G/51G) and the second mode derives the residual current internally from the 3 line CTs (50N/51N). The IDMT curve has a user programmable reset characteristic either DTL or IEC or ANSI decaying to improve grading with electromechanical protection.
- 6. Communications • The relay offers a USB port as a standard on the front of all units.All of the relay functions can be set on a PC using Reydisp Evolution software via the USB port.The connection is made with a USB cable and operates with a ‘plug and play’ connection, so no pre-setting of the relay is required. • In the dual powered relays, the front port can be switched off or set to use either the Modbus RTU or IEC 60870-5-103 protocols for testing purposes. IEC60870-5- 103 protocol is a default in the Self Powered Relays. NOTE: Reydisp Evolution software will work with the relay only when the USB port is configured to the IEC 60870-5-103 protocol in the dual powered relays. An internal terminating resistor is provided, which can be connected into the circuit by adding a wire loop between the relevant terminals.
- 7. Data Acquisition -Via Communication Interface Sequence of Event Records (Event Log) Up to 100 events can be stored and time tagged to 1 ms resolution.The events are stored on first-in-first-out basis.The events are available through the communication interface. Fault Records (Trip Log) The last 10 fault records are displayed on the relay fascia and are also available through the communication interface with time and date of trip, measured quantities, and type of fault. RealTime Clock The time and date can be set and is maintained while the relay is de-energised by a coin cell battery
- 8. Construction • The relay is housed in a non draw-out 4U high, size 4 case • The rear connection comprises of user friendly pluggable type terminals for pulse and flag output, binary inputs , binary outputs, RS485 communication and auxiliary input. • The CT terminals are suitable for ring type lug connection to provide a secure and reliable termination.
- 9. User Interface The operator interface is designed to provide a user friendly method of viewing menus, entering settings, and retrieving data from the relay. Five buttons are provided for navigation around the menu structure. Additionally, two buttons are provided for battery ON/OFF and backlight ON/OFF functionality. LCD A 2 line by 16 character liquid crystal display with power save operation indicates the relay identifier, settings, instrumentation, and fault data. LEDs 9 non-programmable LEDs are available eliminating the need for expensive panel mounted pilot lights and associated wiring. Flag Indicator 1 local flag indicator is provided and configured for the trip indication. Relay Information The user can also give the device its own identity by editing the ‘Relay Identifier’ displayed on the LCD
- 10. Case Dimensions
- 12. Function Overview Protection • 50 Instantaneous Overcurrent Protection • 50N/G Instantaneous Derived/Measured Earth Fault Protection • 51 Time Delayed Overcurrent Protection • 51N/G Time Delayed Derived/Measured Earth Fault Protection • 50LC/SOTF Switch-On-To-Fault Features • Password Protection • Self Monitoring • Trip Timers • Healthy shut-down below operating ranges • Remote reset (binary input based) of flag with/without • CT power and Auxiliary power • Two Settings Groups
- 13. Mob No: Mr. Piyush Rathi- +91-9819614841 Website: www.reliservsolution.com Email-ID: piyush@reliserv.in sales1@reliserv.in Address: Office No: 9, Space Heights, Plot No. 53/54 , Sector 34, Kamothe,Navi Mumbai- 410209 Contact us