top of page


Hertz Engineering is specialized in testing all type of relays from main various manufacturers such as ABB, Siemens, Schneider, and SEL.  We provide these testing services to major utilities and various industries.  Our engineers are familiar with logic diagrams and setting of protection relays, keeping the safety and interminable operation of the system to stop unnecessary tripping. Some of the protection relay schemes that our personnel have worked on are:

  1. Transmission Line Protection Relays (Impedance Relays)

  2. Power Transformer Protection Relays (Differential Relays and REF)

  3. Feeder’s Protection Relays (O/C, S/C and E/F)

  4. Generator Protection (Differential Protection)

  5. Busbar and Breaker Failure Relays

bottom of page