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Energies 2017, 10(3), 380;

A New Method to Monitor the Primary Neutral Integrity in Multi-Grounded Neutral Systems

School of Electrical Engineering, Shandong University, Jinan 250061, China
Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education, Shandong University, Jinan 20061, China
FortisAlberta, Calgary T3K6E8, AB, Canada
Author to whom correspondence should be addressed.
Academic Editor: José Gabriel Oliveira Pinto
Received: 14 December 2016 / Revised: 26 February 2017 / Accepted: 13 March 2017 / Published: 16 March 2017
(This article belongs to the Special Issue Power Electronics and Power Quality)
Full-Text   |   PDF [3538 KB, uploaded 17 March 2017]   |  


In the three-phase four-wire system, there are usually multiple grounding points in the primary neutral line due to safety and economic considerations. The rising “neutral to earth voltage (NEV)” caused by a broken primary neutral can threaten the safety of nearby facilities and humans; therefore, the integrity of the primary neutral conductor is of vital importance for the multi-grounded neutral (MGN) system. In this paper, a new passive method is proposed to monitor the integrity of the primary neutral line in the MGN system. The method is based on the measured voltage and current data at the service transformer, and there is no need to install any signal generators. Therefore, it causes no disturbance to the utility and customer. In the paper, the equivalent analysis circuit is established and a new parameter is proposed to reflect the neutral condition. The value of the parameter is estimated based on the measured data, and then, the equivalent impedance of the primary neutral groundings can be obtained. On the other hand, the impedance value for the primary neutral under normal operating conditions can be estimated based on the derived analytical formulas. By comparing the monitored primary neutral impedance with its normal value, the broken neutral condition in the primary system can be detected. Different primary neutral broken cases are analyzed in the paper based on the Monte Carlo simulation. The results indicate that the integrity condition in the primary neutral can be accurately monitored by the proposed method. View Full-Text
Keywords: primary neutral integrity; multi-grounded neutral (MGN) system; neutral integrity detection; passive method primary neutral integrity; multi-grounded neutral (MGN) system; neutral integrity detection; passive method

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Xie, X.; Sun, Y.; Long, X.; Zhang, B. A New Method to Monitor the Primary Neutral Integrity in Multi-Grounded Neutral Systems. Energies 2017, 10, 380.

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