Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Response Characteristic Analysis of ZnO Varistors by the Conductive E1 Pulse

전도성 E1 펄스에 대한 ZnO 바리스터의 동작특성 분석

  • Received : 2019.02.28
  • Accepted : 2019.03.27
  • Published : 2019.05.01
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Abstract

This work presents the response characteristics of a ZnO varistor to conductive EMP. An E1 pulse, standardized to MIL-STD-188-125-1, was applied to the varistors wherein the residual current and response times were measured with the applied E1 pulse current. Additionally, the response time was measured according to the length of the connection path. Consequently, the amplitude of the residual voltage through the ZnO varistors was increased with increasing amplitude of the applied E1 pulse current. As the length of the connection path increased, the operating response time and residual peak voltage also increased. These results indicate that the response characteristics of ZnO varistors can be applied to basic data to support the use of varistors as a protective measure against conductive EMP.

Keywords

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Fig. 1. Current waveform of E1 pulse.

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Fig. 2. Experimental set-up.

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Fig. 3. The output waveform of PCI generator.

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Fig. 4. The varistors used in test.

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Fig. 5. Waveforms of the input pulse current and residual voltage at 200 A.

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Fig. 6. Waveforms of the input pulse current and residual voltage at 800 A.

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Fig. 7. Typical waveform of residual voltage.

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Fig. 8. Changes of residual voltage to injected E1 pulse.

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Fig. 9. Changes of response time to injected E1 pulse.

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Fig. 10. Changes of response time with length of connection path.

Table 1. Definition of conducted HEMP waveform in Mil-Std-188-125-1.

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Table 2. Specification of varistors.

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Table 3. The response time and residual peak voltage with change of connection path length.

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References

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