The Test bay and calibration division of Tira Thai was awarded standard ISO/IEC 17025,

Tira Thai Test Bay Division

Tira Thai has two testing laboratories,

			At Lab.1 we can test transformers up to 1 kVA - 5000 kVA.
			At Lab.2 can test transformer capacity 1 kVA - 100 MVA.

The testing is divided in to three types of test,

			Rountine Tests
			Type Tests
			Special Tests

The testing is done in reference to design standard or the requirement of the client, IEC 76, IEEE C57.12, DIN, TIS, etc.

Tira Thai test bay division employ's persons, engineers and technicians that have knowledge and experience in using measuring equipment's both H.V. and L.V.,

Measuring Equipment's will be calibrated and registered. They are traceable to The National Laboratory.

Measuring Equipment's in test division will be calibrated by our Calibration Division.

Measuring Equipment's in Calibration Division will be calibrated at external laboratory that have ISO/IEC 17025, National Institute of Metrology (Thailand), Thai Airways International Public Co., Ltd., KEMA Lab. Netherlands, etc.

Fig. 1 Tira Thai Laboratory (Lab. 2)

The test hall is designed as Faraday's cage, it has an Impulse Generator set max. voltage 1400 kV max. energy 70 kJ, Chopping Gap 1200 kV, HV Testing transformer 0 - 250 kV, Auxiliary transformer 4000 kVA, PD detector set and measuring equipment.

The Testing Hall (Testfield) contains all special equipment that is used testing Electric transformers. We paid more than 50 million Bath to set up this standard laboratory. Some equipment is designed and build at our own facilities ,such as HV Testing transformer that is used in Applied potential test to step-up AC voltage from 0 - 400 v (input) to 0 - 250 kV (output) and can cascade up to 375 kV. We have a reactor used to compensate the power factor in case of testing big transformers that have high capacitance.

Fig. 2 HV. Testing transformers 3 x 75 kVA 400v-125kV used in Applied potential test ,can cascade up to 375 kV designed and made by Tira Thai.

Tira Thai Lab. Employs an auxiliary transformer 4000 kVA 1500V/6.9/50 kV that can be configured to be used in many levels of voltage and current.

Fig. 3 Auxiliary transformer 4000 kVA , three winding 1500v/6.9 kV/50 kV, designed and made by Tira Thai.

Tira Thai also has a capacitor bank 16.5 MVAR that is used to compensate for power factor when making short circuit or temperature rise test.

Fig. 4 C-Bank 16.5 MVAR used to compensate power factor in short circuit or temp rise test, it can be connected to delta or wye.

Tira Thai has a 500 kW generator adjustable frequency from 0 - 500 Hz for use in Induced Voltage test and a 250 kW 200 Hz used in Partial Discharge Test.

Fig. 5 Generator 500 kW 1500 V 0-500 Hz for Induced voltage test, and Generator 250 kW 750/1500 V 200 Hz for PD test.

Every set of equipment such as voltmeter, ammeter , wattmeter, Impulse Generator, etc. will be calibrated periodically.

Electronics equipment is protected against damage by storing it in a controlled temperature shielded room.

They are maintenanced and registered.

Fig. 6 Measuring equipment's

In Type Test, Tira Thai has special equipment. Tira Thai operators have knowledge and experience. for Dielectric test or Impulse Test ( Lightning Impulse or switching Impulse) , we purchased an Impulse Generator set series E from Haeferly Technology, Switzerland. This IG set can produce a maximum impulse voltage of 1400 kV with a maximum energy 70 kJ This IG set is used to test dielectric of the transformer, in case of Chopped wave test , we have a Chopping Gap 1200 kV used to generate desired chopped wave.

Fig. 7 Impulse Generator set Series E, Haeferly, Switzerland 1400 kV 70 kJ and Chopping gap 1200 kV.

For special tests we have bridge to measured capacitance and dissipation power factor of dielectric of transformers, Tettex Instrument.

Fig. 8 Capacitance & Standard measuring set ,from Tettex Instruments, Switzerland

Measuring sound pressure level will be done in Tira Thais sound insulated test hall that is designed to protect against sound from another place. We do have the appropriate area and ambient condition for testing.

Fig. 9 Sound pressure level meter

The durability of the transformers insulating system can be indicated by the PD level of the dielectric of the electric transformer. Tira Thai lab. Has a Partial Discharge (PD) measuring set, PD detector Type 561 and PD Analyzer, 50 kV from Haeferly, Switzerland.

This set includes programs for analyzing of faults in the of dielectric system of transformers.

Fig. 10 Partial Discharge (PD) measuring set

Tira Thai Calibration Division

The equipment used in measuring must give a true reading, the same as, or as close as possible to standard value. If the measuring equipment is not up to standard, the products will not be standard too.

Tira Thai Calibration Division calibrates equipment that is used in Tira Thai Testing lab. And is used in the factory. They are tractable to National lab. Tira Thai calibration lab. received ISO/IEC 17025 from TIS, this is standard that acceptance for laboratory.