For the turn–key solution of your power plant or substation we are ready to offer you a complete site testing and commissioning service. Our experienced engineering crew guides you through quality control at all stages of production or electrical works. Our Q&C department performs site testing and commissioning according to international standards (certificates).


Our vast scope of work varies from Basic testing, Functional testing, Relay protection testing and Special testing:


Basic testing:

— Cable insulation resistance test
— Transient resistance measurement
— Protection device test
— Electrical installation test
— Protection against indirect contact test
— Earthing resistance test
— Earth continuity test
— Lightning protection installation test
— Electrical installation test
— Auxiliary power supply systems dc or ac voltage test
— Electric motors and their protection test
— Protection against static electricity test


Functional testing:

— Control devices in the bay/field/ss
— Signaling status device & protection tripping in the bay/field/ss
— Interlocking's between devices in the bay/field/SS
— Disconnection of protective devices


Numerical relay protection systems:

— Setting study
— Numerical relay configuration
— Parametrization
— Testing & report generation


Specialistic testing:

— mv/hv power transformer diagnostic testing
— Circuit breaker testing
— Current/measurement transformer testing
— Grounding system testing
— Infrared thermography
— High voltage cable testing
— Cable fault diagnostics
— Battery system testing

Telephone +385 1 2781 451
Email quality.control@helb.hr
Language Croatian, English