Tap Changer Analyzers & Winding Ohmmeters Both the injection of the current and the discharge of energy from transformer magnetic circuit are automatically regulated. The device generates true DC ripple-free currents. Transformer winding resistance is determined by injecting DC current through a winding, accurately measuring DC voltage across the winding, and then calculating resistance as the ratio of voltage and current. TWR-H compares measured turns ratio with the nameplate ratio and prints out the % of error for each test.
#Motor winding resistance manual
This feature eliminates any error otherwise caused by an operator’s manual calculation. User can enter a transformer’s nameplate voltages, so that turns ratio deviation can be calculated.
Transformer turns ratio is determined by applying AC voltage across high voltage winding, accurately measuring AC voltage across the corresponding unloaded transformer winding, and then displaying the ratio of these voltages. It can also perform demagnetization of these transformers. TWR-H is a handheld, battery operated, fully automatic test set specially designed for turns ratio, phase shift, excitation current and winding resistance measurements of transformers. Handheld Turns Ratio & Winding Resistance Tester TWR-H - Amperis sl Up to 100 tests can be performed with a fully charged battery.
#Motor winding resistance verification
The instrument can output test voltage up to 40 V AC for this test, but it can also output a very low test voltage of 1 V AC which is necessary for turns ratio verification of the majority of current transformers.TWR-H is powered by an internal Li-Ion battery. This enables detecting transformer core or winding turns failures which cannot be spotted by measuring turns ratio only. The demagnetization process is completely automatic and safe.Together with the turns ratio, the instrument also measures excitation current and phase shift. Upon the winding resistance test, it is also possible to demagnetize the transformer core. These transformers have large turns ratio and therefore a big difference between resistances of high voltage and low voltage windings. This is especially useful when measuring winding resistance of distribution transformers. The second DC source can output up to 10 A DC and is used for testing the transformer’s low voltage winding. The first DC source can output up to 2 A DC and is used for injecting current to the transformer’s high voltage winding. Handheld TWR-H device is DV Power single-phase instrument designed for measuring transformer winding resistance and turns ratio.The instrument has two output DC sources for measuring transformer winding resistance.
Handheld Turns Ratio & Winding Resistance Tester
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