ABB recently introduced a new type of protective relay, the SPAJ110C, which is a ground fault protection relay designed for power systems. The SPAJ110C has two protection stages: a low-set overcurrent stage I0> and a high-set overcurrent stage I0>>. The low setpoint stage can have a timing or inverse time characteristic, while the high setpoint stage has a timing characteristic only. This relay can be used not only as a primary protection and backup ground fault protection relay for feeders, transformers, generators and motors, but also in conjunction with residual voltage relays for blocking/de-blocking ground fault relay operation.

SPAJ110C features include:

Low setpoint neutral overcurrent stage has timing or inverse time characteristics.

The high setpoint neutral overcurrent stage has timing characteristics.

The output relay function can be freely configured to flexibly adapt to different types of applications.

With a serial interface, the relay can be connected to the fiber optic object bus as well as the substation and network control system.

Digital display set value, neutral current measurement value, memory fault value, etc.

Continuous self-monitoring, with automatic diagnostic functions for hardware and software.

In terms of technical data, the SPAJ110C has a rated frequency of 50Hz or 60Hz and an auxiliary voltage range of 80… 265V AC/DC The input current rating is 1A or 5A, with continuous heat tolerance and dynamic current tolerance. The rated output contact voltage is 250V AC/DC, capable of carrying 5A current continuously.

Examples of SPAJ110C applications include feeder ground fault protection, ground fault protection for incoming and bus systems, and feeder backup protection. The relay is connected to the control system of the substation through the optical fiber data communication bus, which ensures the high-speed and stable data transmission.

With the launch of this new product, ABB has once again demonstrated its technological strength and innovation in the field of power system protection. The introduction of SPAJ110C provides an efficient and reliable grounding fault protection solution for the power industry, which helps to improve the reliability and safety of the power system.