A complete common Test Bench to perform No Load Test (OC Test), Full Load Test (SC Test), Induced Over Voltage withstand Test (DVDF Test), High voltage test for LT & HT, To measure NO load & Full Load Losses, Efficiency, Impedance, Insulation and other Electrical parameters of 3-Phase Distribution and Power Transformer ranging from 16 KVA to 50 MVA rating along with 3-Phase intermediate Transformer of Suitable capacity, 3-Phase Motorized variable auto transformer of suitable capacity :- 440 Volts Input & 0-470 Volt output, Motor Generator set of Slip Ring Motor & Induction Motor along with suitable contactors, Panel meters &Required accessories.
For DVDF & Load No-Load functionality, Control and the same Loading transformer unit along with the same variable motorized auto transformer are used.
( N.B. Generally, above 1 MVA, there comes into place an additional 3rd unit in the form of variable auto transformer. Above 3 MVA, the Loading Transformer comes into place as an additional 4th unit ).
The inclined front panel has indicating lamps, HRC fuses, push buttons, mode changing rotary switches, voltmeter selector rotary switches, digital frequency meter ( for DVDF ) along with its toggle switch to indicate Input/output frequency and these are all part of ' Control unit'. 1 no. Digital voltmeter of 96 sq.mm. is provided for Input voltage measurement and 1 no. Digital AC voltmeter of 96 sq.mm. for measuring the Output voltage. Besides these, 3 individual Digital ammeters of 96 sq.mm. are also connected to 3 different phases for measuring Output currents in the respective phases and all these meters are for DVDF purpose.
For Power Frequency High Voltage Testing the Control Section along with Voltage Regulator,Metering & Tripping Arrangement are provide in the panel.
For Load No-Load measurements, arrangements of One Three Phase Power Analyzer is given in the Panel. Mounted inside are current measuring CT's, voltage measuring P.T's ( for DVDF purpose ), contactors, automatic star-delta starters ( for DVDF ) , loading transformer, variable auto transformer ( if rating is above 1 MVA, the auto transformer will be treated as a separate unit as previously mentioned in nota-bene. )
4 nos. casting wheels at the bottom of powder coated sturdy steel cabinet is provided for easy mobility. 4 nos. lifting hooks are also there for lifting purpose. All nomenclatures are engraved in anodized aluminum plates which are placed on the inclined front panel.
: 415 V, 3 Phase, 4 Wire, 50 Hz A.C
For DVDF Test
: 0 - 1000 V, 3 Ph. 100 Hz. At Four Different Taps.
For Load & No-Load (For Distribution Transformer)
: 0 - 600 V 3 Phase, 50 Hz
For Load (For Power Transformer)
: 0 - 3600 V 3 Phase, 50 Hz
: 0 - 600 V 3 Phase, 50 Hz.