Laboratory testing

Type tests and development tests according to standards, or other, e.g., electricity supplier's regulations, considering our technical capabilities.

Due to the diversity of the products and their technical parameters, manufacturer and end-user specifications, and the diversity of our testing options, we individually check every testing request we receive, and then inform the customers about the feasibility and conditions of testing.

The most frequently tested products and the tests performed on them:

Power transformers and distribution network transformers

• Temperature-rise test
• Dielectric strength test with industrial frequency and impulse voltages
• Routine tests (50 Hz or 60 Hz transformers)
• Short-circuit test
• Partial discharge measurement
• Acoustic noise measurement
• Mechanical tests (IP, IK, bending and torsion test of bushing insulators)

Insulators and insulating strings (glass, porcelain and composite insulators and strings)

• Industrial frequency test
• Lightning and switching impulse test
• Corona and radio interference measurements
• Power arc test
• Mechanical tests (thermomechanical and electromechanical tests)
• Partial discharge measurement
• Thermal cycle test
• Material tests (UV and Xenon lamp test, fire resistance)
• Salt fog test
• Dielectric test in oil

Low-voltage switchgear and controlgear

• Making and breaking test
• Short-circuit test of devices and equipment
• Dielectric test
• Internal arc test
• Short-circuit test enclosed busbars
• Continuous current test
• IP and IK tests
• Mechanical tests (operation, load, lifting...)

Measuring transformers (Low, medium and high voltage current transformers, voltage transformers or combined measuring transformers)

• Temperature-rise test
• Dielectric strength test with industrial frequency and impulse voltages
• Short-circuit test
• Internal arc test
• Partial discharge measurement
• Accuracy measurement, error determination
• Capacitance and tgδ measurement
• Radio interference (RIV) test
• IP and IK protection tests
• Mechanical tests

Overhead-line conductors, optical ground wires (OPGW), optical phase conductors (OPPC), covered conductors, railway contact wires, and assemblies

• Short-circuit test 
• Lightning test
• Current-temperature test
• Modulus of elasticity measurement and tensile strength test 
• Creep test
• Mechanical tests of OPGW, OPPC conductors (impact test, compression test)
• AC/DC resistance measurement
• Heat cycle test
• Verification of construction
• Corona and radio interference measurement
• Self-damping measurement
• Dielectric tests of covered conductors (insulation resistance and leakage current measurement)
• Stringing test
• Test of aluminium and steel wires
• Galvanisation and coating thickness test

Test of spacers and/or vibration dampers

• Verification of mass and dimension
• Corrosion protection test
• Slip test
• Bolt torque tightening test
• Simulated short-circuit test (compression, tension)
• Characterisation of elastic and damping properties
• Flexibility test (longitudinal, vertical, conical, transversal)
• Fatigue tests
• Damper effectiveness calculation with software modelling
• Resistance measurement
• Corona and RIV test

Over-voltage protection equipment

• Short-circuit test
• Operating voltage test 
• RIV test

Reactors

• Temperature-rise test
• Routine tests
• Short-circuit test
• Dielectric tests (50 Hz and lightning impulse test)
• Acoustic noise measurement

Medium and high-voltage switchgear and controlgear equipment

• Certain making and breaking tests 
• Short-circuit tests of switchgear and enclosed equipment
• Internal arc test
• Temperature-rise test
• Dielectric tests
• IP and IK tests
• Mechanical tests (operation, lifting…)
• RIV test

Medium and high-voltage cables and cable assemblies

• Test of insulators (insulation resistance and leakage current measurement)
• Dielectric tests (50 Hz and lightning impulse test)
• Temperature-rise test
• Short-circuit test
• Short-circuit and power arc test on screen
• Partial discharge measurement
• Capacitance and loss factor measurement
• Thermal cycle test 
• Clean and salt fog test
• Mechanical test (tensile, bolt torque tightening)

Fuses

• Short-circuit breaking test
• Fuse characteristic measurement
• Temperature-rise test
• Dielectric tests (50 Hz and lightning impulse test)

Earthing, earthing-short-circuiting devices

• Short-circuit test
• Mechanical test

Equipment for live line working (protective cloth, helmets, ropes)

• Insulation tests
• Dielectric tests
• Arc test
• Mechanical and environmental tests

Fire extinguisher for live line work

• Leakage current measurement

Environmental tests for nuclear power plant

• Operating and DBE simulation of nuclear power plant
• Ageing test (Thermal, electric, γ radiation and seismic tests)
• Verification of proper operation

See the list of tests carried out in accredited status and the limit parameters in the appendix of our Accreditation Certificate.

Testing possibilities:

• Industrial-frequency tests max. 1500 kV (50 Hz)
• Lightning impulse tests (0.5-5 / 10-100 µs) 3600 kVpk
• Switching impulse tests (250 / 2500 µs ) 3600 kVpk
• Surge tests (~4000 kV / μs)
• DC voltage test 200 kV
• Partial discharges and radio interference tests 700 kV (500 mA)
• Short-circuit tests max. 200 kA 
• Power arc test of enclosed equipment: low voltage 100 kA, medium voltage 31.5 kA
• Short-circuit test of overhead-line conductors and spacers 50 kA (62.5 m) / 30 kA (125 m)
• Power arc test of HV insulators 50 kA
• Making and breaking tests of LV switchgear and controlgear 120 kA/690 V
• Temperature-rise test max. 10 kA
• Heat cycle tests max. 10 kA
• Creep test on 10 m long sample 
• Tensile break test on 14 m long sample, with max. 300 kN tensile load
• Tensile break test on 4 m long sample, with max. 800 kN tensile load
• Bending and twisting mechanical tests in individual cases