The following low-power current transformer ratios are suitable for the following primary current operating ranges:
300 A /225 mV for a primary operating current range of 60 A to 630 A
600 A /225 mV for a primary operating current range of 120 A to 1250 A
1250 A /225 mV for a primary operating current range of 250 A to 2500 A
100 A /225 mV for a primary operating current range of 20 A to 200 A.
The SIPROTEC 7SK81 is a multi-functional motor protection relay. It is designed for protection of asynchronous motors of all sizes. The relays have all the required functions to be applied as a backup relay to a transformer differential relay.
The relay provides numerous functions to respond flexibly to the system requirements and to deploy the invested capital economically. Examples for this are: exchangeable interfaces, flexible protection functions and the integrated automation level (CFC). Freely assignable LEDs and a six-line display ensure a unique and clear display of the process states. In combination with up to 9 function keys, the operating personnel can react quickly and safely in any situation. This guarantees a high operational reliability.
- 4 current inputs
- 0/3 voltage inputs
- 3/7 binary inputs (thresholds configurable using software)
- 5/8 binary outputs (2 changeover)
- 0/5 RTD inputs
- 1 life contact
- Pluggable voltage terminals.