Numerical Line and Motor Protection Relay Block 7SJ531

Type : 7SJ531
Features and technical specifications:
1. Line protection
2. Over current-time protection, phase and earth fault protection, either definite-time or inverse time (IEC or ANSI)
3. Reverse interlocking
4. Overload protection acc. to IEC 255-8
5. Under voltage and over voltage protection
6. Automatic reclosure
7. Sensitive earth-fault detection
8. Circuit-breaker failure protection
9. Directional overcurrent time protection
10. Directional comparison protection
11. Unbalanced-load protection
12. Fault locator
13. Switch-onto-fault.
14. Motor protection
15. Transformer protection
16. Analog inputs
– 5 current transformers
– 3 voltage transformers

Digital inputs/outputs – 11 binary inputs & 5 alarm relays, 4 command relays.                                                      
This Numerical Line and Motor Protection Relay Block is easily insert in your schematic diagram and connect as you like way.                                                                                                             As a motor protection relay the 7SJ531 is suitable for asynchronous machines of all sizes and as back-up protection it is well suited for equipment requiring differential protection such as lines, transformers or generators. The integrated control functions allow control of the switching device via the integrated operating panel, 2 binary inputs, DIGSI or LSA/SCADA. Various types of switch gear with single and duplicate bus bar which contain a controllable switching device, are supported. All components for analog value acquisition and numerical evaluation. Integrated keypad and graphic display with feeder control diagram. Indication and command outputs. Binary inputs,Serial interfaces for parameterization and connection to substation control an protection, Auxiliary voltage converter. The device can be supplied with two different housings. The housing for panel flush or cubicle mounting has rear side connection terminals. The housing designed for panel surface mounting is provided with two-tier terminals accessible from above and below.