Case Studies Using an Additional Neutral Point PD Sensor for Generator Stator Monitoring

Stein, R. F.; Laird, T.; Watters, Charles

doi:10.1109/elinsl.2008.4570393

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…In Figure 1(b), the high-energy PD pulses pass through the insulator to the power bus and neutral. This is the well-known conduction emission, and the PD signal is detected by installing the capacitor and high-frequency current probe at the terminals of the power bus and neutral, respectively [8][9][10][11][12]. Owing to the noise issue, most studies use this method to detect PD from the rotating machine.…”

Section: Partial Discharge In 33-kv Motormentioning

confidence: 99%

“…Then, various techniques (such as a phase resolved PD pattern) are used to look for the cause of PD. If PD is detected at the neutral point [12], conventionally, a high-frequency current probe or a capacitive PD sensor is used to detect PD. The critical slot discharge initiates high-energy PD pulses, which lead to PD signals in the neutral point PD sensor.…”

Section: Introductionmentioning

confidence: 99%

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Partial discharge detection of 3.3-kV motor by coil

Chen

Cheng

Chen

2016

Int. Trans. Electr. Energ. Syst.

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The coil is used to detect partial discharge (PD) in the 3.3-kV motor. Because of the noise issue, most studies detect PD of the motor at the power bus or at neutral. However, we use three coils inserted in the slot of three motor frames to detect PD. This conflicts with conventional thought. For safety, the motor frame is always grounded to the earth. In addition, most people think it is impossible to detect PD on the grounded motor frame. Most researchers say we measure noise or high-frequency current on the motor frame. In this paper, we design an experiment to prove that what we measure is the induction magnetic field of PD. From the amplitude variation of the PD signal, the imperfect motor can be identified. Moreover, by measuring the PD signal and the three-phase 60-Hz waveform, we can determine the phase at which PD occurs.high-intensity PD signal can be detected by the coil. Because most PD power is below 100 MHz for a winding device [16], coil S m will detect the PD signal with good performance. Verification of induction magnetic field passing through steelAs shown in Figure 2(b) and (c), the induction magnetic field of the PD passes through the paper insulator and stator core to the coil. To simulate this condition, we perform verification tests using the standard 11.4-kV power transformer tank filled with insulation oil to do the experiment. As for PD detection, except for mechanical dimension, the structure of the transformer tank in Figure 5(a) Figure 4. Reflection coefficients S 11 of two sensors (30 kHz to 100 MHz): (a) sensor S 1, (2 dB/div), (b) sensor S m (5 dB/div).

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Section: Partial Discharge In 33-kv Motormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Partial discharge detection of 3.3-kV motor by coil

Chen

Cheng

Chen

2016

Int. Trans. Electr. Energ. Syst.

View full text Add to dashboard Cite

show abstract

“…To prevent this, the coating of higher resistivity (hundreds of kilo ohms per area) is used in case of slot region protection. In addition the coating is divided into several sections with stepped value of both the permittivity and the sheet resistivity [7][8][9]. Such a kind of surface treatment makes the curve of voltage stress more linear.…”

Section: Introductionmentioning

confidence: 99%