The neutral-to-earth voltage (NEV) test case and distribution system analysis

Abstract

Modeling NEV issues requires the most detailed circuit models for distribution system analysis except for, perhaps, lightning surge protection analysis. A proposed line model benchmark is solved and results reported. Modeling NEV will become an increasingly important problem. Based on the proliferation of harmonic producing loads in residential environments, the amount of triplen harmonics will tend to increase, with an accompanying increase in neutral-earth voltages.

Neutral Voltage Comparison of Different Grounding Configurations and Calculation Methods in Multi-Grounded Low Voltage Network

“…The neutral voltage profile is also different with ideal transformer grounding from the usual 'U' shaped profiles (e.g. based on test system described in [14]). …”

A Review of Power Distribution Test Feeders in the United States and the Need for Synthetic Representative Networks

“…In this paper, the direction and the requirements of the upcoming test feeders were presented, highlighting seven topics to take into account: neutral-to-earth voltage (NEV), short circuit benchmarks, distributed generation (DG) protections, large distribution system models, inverter-based DG models, comprehensive test feeders, and asymmetrical contingencies test feeders. Answering the previous needs, three new test feeders were published, a NEV test case [9], a medium-sized feeder to scale-up algorithms [10], and another with a wide variety of equipment [11]. In 2014, a new meshed low voltage test system was published [12].…”

“…Nowadays, modeling NEV is becoming an important issue, however, it requires more detailed test networks. This test case described in [9] provides a test feeder that explicitly includes pole ground resistances and aims to understand the impact on contact voltage levels and NEV under different parameters of neutral conductor section or ground resistance. This test case is mostly used in load modeling studies [22][23][24] and harmonics analysis [25].…”

Neutral-earth voltage test case solutions with an electromagnetic transients program

“…The NEV of 160.33 volts is closer to [9][10], but in general, all ATP simulations ought to use the full Carson correction terms. • PQ-DSS: like PQ-Car, but using the line parameters from [9]. The NEV of 159.42 is within 0.34% of the value, 158.88 volts, reported in [9].…”