menu

Quality Program

missing image missing image

Quality Assurance

The quality assurance in Hyundai Heavy Industries Co. Bulgaria is performed according to a Quality Management System certified under ISO 9001:2015.

	missing image

 

The quality control includes:

 

Incoming quality control of all materials and accessories. 

 

  • All materials undergo different types of incoming quality control. Materials essential for the overall quality of our products undergo tests in the company testing laboratories.

 

Quality control during manufacturing.

 

  • During the manufacturing process all stages are monitored according to approved by the top management Quality plan.


End control and testing.

 

  • All transformers undergo routine tests according to IEC 60076, IEEE or other international standard as specified by the client.
  • On client’s demand by the client additional special and type tests are performed.
  • All tests are performed on-site in HHIB testing laboratories, except short circuit withstand.
  • The transformer short circuit withstand capability is proved by means of calculations.
  • On client's demand the tests can be performed in internationally acknowledged independent laboratories such as KEMA - Holland, CESI - Italy, ICMET - Romania.

Laboratory "Transformers"

 

The Transformer Laboratory is accredited according to ISO 17025 with the following scope: to perform all routine, type and special tests required by international or local standards or requested by the customer.


The laboratory includes two separate sections - "High Voltage" section and "Transformers" section. A "Generator hall" provides both sections with voltages with frequency of 50, 60 and 200 Hz.


The following tests can be performed in the respective sections

 

  • Turn-ratio measurement and phase displacement:
  • DC resistance of the windings
  • No-load losses and harmonics in no-load current
  • Short-circuit impedance and load losses
  • Zero-sequence impedance
  • Heat-run test and power consumption of cooling system
  • Sound-level and vibrations measurement
  • SFRA
  • Watt balance test
  • C and power factor measurements of the insulation
  • Insulation resistance
  • Oil breakdown voltage measurement
  • Lightning Impulse voltage test including chopped wave
  • Switching Impulse voltage test
  • Separate source AC withstand voltage test
  • Induced overvoltage test
  • Partial discharges measurement
  • Transients transferred through the windings

The Transformer Laboratory is accredited according to ISO 17025 with the following scope: to perform all routine, type and special tests required by international or local standards or requested by the customer for OLTCs.

  • Full wave lightning impulse test (LI)
  • Chopped wave lightning impulse test (LIC)
  • Switching impulse test (SI)
  • Applied voltage test (AV)
  • Measurement of partial discharges

 

Certificates

GOST certificate -TR.png
GOST Certificate
ISO 3834-2-2005.png
ISO 3834-2-2005
TR Lab accreditation.png
BAS reg. number: 243 ЛИ