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Cable Shield Grounding for Transient Overvoltage Testing in Power Generation/Transformer Substations
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DOI：10.1109/TPWRD.2025.3647954.png)
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Abstract
En 中文
Transient Overvoltage (TOV) poses significant safety risks to both substation equipment and personnel. Accurate measurement provides an essential reference for overvoltage protection. At present, the outer shield of the test cable used for potential leads is typically grounded at both ends to the ground grid (Method 1) to suppress external magnetic field interference. However, TOV events are usually accompanied by strong Ground Potential Rise (GPR), which causes interference currents on the shield due to Ground Potential Difference (GPD), leading to measurement errors. To address this issue, this paper proposes an alternative grounding scheme in which the outer shield is connected in parallel with a metal return wire (Method 2), thereby mitigating the impact of GPD. A numerical calculation model for evaluating the Shielding Effectiveness (SE) of the test cable under both interference magnetic fields and GPD was developed. The SEs of Method 1 and Method 2 were analyzed in both the frequency domain and under typical transient magnetic field waveforms in the time domain. The results show that, for each GPD frequency, there exists a characteristic interference magnetic field frequency f. When the magnetic field frequency is lower than f, Method 2 achieves significantly higher SE than Method 1; when it is higher than f, the SE of the two methods becomes nearly identical. Under typical magnetic fields, Method 2 consistently outperforms Method 1, with a maximum SE difference of 28 dB observed under a ringing wave condition. In practice, the selection of the test cable shield grounding method during TOV testing at generation and transformer substations should be based on the dominant frequency of the interfering magnetic field and the amplitude and frequency of GPD. For Transient Ground Potential Rise (TGPR) tests, Method 2 is strongly recommended.
Keywords:
Cable shielding
Wire
Magnetic fields
Grounding
Interference
Power cables
Magnetic cores
Testing
Metals
Transient analysis
Electromagnetic compatibility
shielding effectiveness
transient overvoltage testing
cable shield grounding
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