Park, Dae-Won
(Division of Electrical and Electronics Engineering, Korea Maritime University)
,
Kil, Gyung-Suk
(Division of Electrical and Electronics Engineering, Korea Maritime University)
,
Cheon, Sang-Gyu
(Research Institute, PANASIA CO., LTD.)
,
Kim, Sun-Jae
(Research Institute, PANASIA CO., LTD.)
,
Cha, Hyeon-Kyu
(VDE Global Services Korea)
In this paper, we analyzed the frequency spectrum of the electromagnetic waves radiated by an electric discharge as a basic study to develop an on-line diagnostic technique for power equipment installed inside closed-switchboards. In order to simulate local and series arc discharges caused by an ele...
In this paper, we analyzed the frequency spectrum of the electromagnetic waves radiated by an electric discharge as a basic study to develop an on-line diagnostic technique for power equipment installed inside closed-switchboards. In order to simulate local and series arc discharges caused by an electric field concentration and poor connections, three types of electrode systems were fabricated, consisting of needle and plane electrodes and an arc generator meeting the specifications of UL 1699. The experiment was carried out in an electromagnetic anechoic chamber, and the measurement system consisted of a PD free transformer, a loop antenna with a frequency bandwidth of 150 kHz-30 MHz, an ultra log periodic antenna with a frequency bandwidth of 30 MHz-2 GHz, and an EMI test receiver with a frequency bandwidth of 3 Hz-3 GHz. According to the experimental results, the frequency spectra of the electrical discharges were widely distributed across a range of 150 kHz-400 MHz, depending on the defects, while commonly found between 150 kHz and 10 MHz. Therefore, considering the ambient noise and antenna characteristics, the best frequency bandwidth for a measurement system to monitor abnormal conditions by detecting electromagnetic waves in closedswitchboards is 150 kHz-10 MHz.
In this paper, we analyzed the frequency spectrum of the electromagnetic waves radiated by an electric discharge as a basic study to develop an on-line diagnostic technique for power equipment installed inside closed-switchboards. In order to simulate local and series arc discharges caused by an electric field concentration and poor connections, three types of electrode systems were fabricated, consisting of needle and plane electrodes and an arc generator meeting the specifications of UL 1699. The experiment was carried out in an electromagnetic anechoic chamber, and the measurement system consisted of a PD free transformer, a loop antenna with a frequency bandwidth of 150 kHz-30 MHz, an ultra log periodic antenna with a frequency bandwidth of 30 MHz-2 GHz, and an EMI test receiver with a frequency bandwidth of 3 Hz-3 GHz. According to the experimental results, the frequency spectra of the electrical discharges were widely distributed across a range of 150 kHz-400 MHz, depending on the defects, while commonly found between 150 kHz and 10 MHz. Therefore, considering the ambient noise and antenna characteristics, the best frequency bandwidth for a measurement system to monitor abnormal conditions by detecting electromagnetic waves in closedswitchboards is 150 kHz-10 MHz.
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제안 방법
In order to measure the radiated electromagnetic waves generated by electric discharges in power equipment inside closed-switchboards in wide ranges, the experiment system consisted of a PD free transformer, a loop antenna with a range of 150 kHz–30 MHz, an ultra log periodic antenna with a range of 30 MHz–2 GHz, and an EMI test receiver with a range of 3 Hz–3 GHz.
This study conducted a basic investigation to develop an on-line diagnostic technique for the power equipment mounted in closed-switchboards. We analyzed the frequency spectrum of the electromagnetic waves generated by local discharges as the result of electric field concentrations and series arc discharges from poor contacts, which cause more than 50% of the accidents in closed-switchboards.
대상 데이터
We analyzed the frequency spectrum of the electromagnetic waves generated by local discharges as the result of electric field concentrations and series arc discharges from poor contacts, which cause more than 50% of the accidents in closed-switchboards. Experiments were conducted in an electromagnetic anechoic chamber to simulate an environment similar to a closed-switchboard, which is shielded from external electromagnetic waves. The measurement range was 150 kHz–2 GHz, and two measurement systems were used simultaneously: a loop antenna with a range of 150 kHz–30 MHz and an ultra log periodic antenna with a range of 30 MHz–2 GHz.
성능/효과
In conclusion, considering the antenna characteristics and background noise, a frequency spectrum of 150 kHz–10 MHz is suitable for diagnosing abnormal conditions by detecting radiated electromagnetic waves in closed-switchboards.
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