7SR1004

Reyrolle 7SR1004 Overcurrent Relay: The Reyrolle 7SR10 Argus overcurrent and earth fault relay is a numerical overcurrent protection relay intended as a low-cost solution for distribution and industrial applications. The Reyrolle 7SR10 Argus overcurrent and earth fault relay is developed using the latest generation of hardware technology and is available in multiple variants depending on the power supply, Binary input/binary output configuration, and data communication facility. Housed in a 4U high, size 4 non-draw-out case and these relays provide protection, monitoring, instrumentation, and metering with integrated input and output logic, data logging, and fault reports. Communication access to the relay functionality is via a front USB port for local PC connection or rear electrical RS485 (optional) port for remote connection.

• It has a Universal power supply suitable for both AC and DC.
• 1A and 5A CT are selectable at the site. Basic communication protocols like MODBUS RTU and IEC 103 are available and they are also site selectable. Relay is equipped with a sufficient number of DI/DO i.e. up to 6 DI and 6 DO.
• 7SR1003 is designed for current-based protection and 7SR1004 is available with additional voltage inputs to take care of voltage-based protections. 7SR1005 is designed for motor protection applications.

Siemens Reyrolle 7SR1004 Numerical Relay Technical Details:

Current Inputs: 4

Voltage Inputs : 3

Binary Inputs: 9

Binary Outputs: 6

LEDs: 10

Four overcurrent elements are provided in the 7SR1004 relay. 50-1, 50-2, (50-3 & 50-4 – 7SR1004) Each overcurrent element (50-n) has independent settings. 50-n Setting for pick-up current and 50-n Delay follower time delay. The instantaneous elements have a transient free operation. Where directional elements are present the direction of operation can be set using 50-n Dir. Control setting. Directional logic is provided independently for each 50-n element, e.g. giving the option of using two elements set to forward and two elements set to reverse.

Four under/over frequency elements are provided in the 7SR1004 relay. The relay utilizes fundamental voltage measurement values for this function. The frequency calculation is based on the highest input voltage derived from the voltage selection algorithm. The relay utilizes fundamental frequency RMS voltage for this function. All under/over frequency elements have a common setting to measure phase to phase (Ph-Ph) or phase to neutral (Ph-N) voltage using the Frequency Input mode setting. Frequency elements are blocked if all phase voltages fall below the 81 U/V Guard setting. The sense of the element (under-frequency or over-frequency) is set by the 81-n Operation setting.

PROTECTION FUNCTIONS

• Broken Conductor, Load Unbalance (46BC)
• Negative Phase Sequence Overcurrent (46NPS)
• Thermal Overload (49)
• Instantaneous Overcurrent Protection (50)
• Instantaneous Earth Fault (50N/G)
• Time-Delayed Overcurrent Protection (51)
• Time-Delayed Derived/Measured Earth Fault Protection (51N/G)
• Cold Load Pickup (51C)
• Circuit Breaker Fail (50BF)
• Time-Delayed Sensitive Earth Fault Protection (51SEF)
• Inrush Restraint (81HBL2)
• Instantaneous Sensitive Earth Fault (50SEF)

SUPERVISION FUNCTIONS

• Trip Circuit Supervision (74TC)
• Total Harmonic Distortion Supervision (81THD)

CONTROL FUNCTIONS

• Lockout (86)
• CB Control

The comprehensive range of Reyrolle products provides the total protection requirements of distribution markets and industrial applications – ranging from overcurrent protection via transformer protection and voltage control to a full spectrum of auxiliary and trip relays. The portfolio includes many famous products such as “Argus, “Duobias”, “Solkor”, “Rho, etc. Through successive generations, Reyrolle numerical products have been developed to increase value to system operators. Discover the portfolio!