About Test method for wind resistance of generator lamp
Generator Efficiency Test • Measurement methods: direct vs. indirect (summation of losses) method depends on the manufacturing plant test equipment • Calculation methods: NEMA vs. IEC (usually higher ) •I2R reference temp: – (observed winding temperature rise + 25° C) or temps based on insulation class (95° C = Class B, 115° C for .
Generator Efficiency Test • Measurement methods: direct vs. indirect (summation of losses) method depends on the manufacturing plant test equipment • Calculation methods: NEMA vs. IEC (usually higher ) •I2R reference temp: – (observed winding temperature rise + 25° C) or temps based on insulation class (95° C = Class B, 115° C for .
The new method requires a high DC test current of at least 300 A and the capability to run a continuous test to generate heat in the weak points in the generator. The measurement circuit must continuously record resistance values with very-high accuracy to detect even very-low resistance changes (in the range of a few µΩ).
Siemens Industry Services supplies the following diagnostic measures: Polarization index test. The polarization index provides information regarding the level of humidity in the insulation or conductive dirt on the winding overhangs in the machine.
The IR test involves an instrument commonly called a Megger. This instrument will apply a ‘test voltage’, measure the ‘leakage current’ and then indicate the value of the winding’s IR in [M] Ohms. A Megger will subject a voltage of some 500V (or more with some megger instruments) to any circuit to which it is connected.
Electrical stress is one of the major aging mechanisms that lead to stator winding failure. The voltage endurance test applies a high voltage (which is 3.76 times higher than the operating voltage) and a high temperature to coils for a short period of time (e.g. 400 hours) to accelerate aging of coils/bars.
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6 FAQs about [Test method for wind resistance of generator lamp]
How to measure winding resistance?
The usual procedure for winding resistance measurement tests is using DC current, waiting for resistance stabilization, and recording the resistance value. The resistance value is dependent on the winding temperature; therefore, it is necessary to correct the value to the reference temperature.
How do you test a motor winding?
Fig. 1 depicts the appearance of the instrument. Testing techniques typically used to evaluate the quality of motor windings include winding resistance testing, withstand voltage testing (hipot test), insulation resistance testing, impulse testing, and partial discharge testing. The ST4030A is an impulse tester.
What is a DC winding resistance test?
The DC winding resistance test checks stator and rotor windings and all circuit connections.
How do you test a winding IR?
found on the website, IR test invol es an instrument commonly called a Megger. This instrument will apply a ‘test voltage’, measure the ‘leakage current’ and then indicate t e value of the winding’s IR in [M] Ohms.A Megger will subject a voltage of some 500V (or more with some megger instrument
How accurate is a winding resistance test?
IEEE Std. 112-2017 requires the test device to have a valid calibration certificate within 12 months and minimum accuracy of ±0.2% of the full scale. When inspecting test results, winding resistance and behavior resistance in the test period should be analyzed (Figure 3).
How to perform a hipot test on generator & motor windings?
Before conducting a hipot test on generator and motor stator windings, it is typically necessary to do a polarization test using a 1000V megger with a polarization index (PI) of 2 or higher. The polarization test, also known as the PI test, refers to the ratio between the insulation resistance values taken at 10 minutes and 1 minute.