Study on the Development of Measurement Technology for Direct Current Power Systems in Insulation State Using AHRD Algor
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ORIGINAL ARTICLE
Study on the Development of Measurement Technology for Direct Current Power Systems in Insulation State Using AHRD Algorithm Ki‑Yeon Lee1 · Seung‑Taek Lim1 · Dong‑Ju Chae1 · Dong‑Woo Kim1 · Young‑Bae Lim1 · In‑Ho Ryu2 Received: 1 June 2020 / Revised: 1 July 2020 / Accepted: 27 July 2020 / Published online: 4 August 2020 © The Korean Institute of Electrical Engineers 2020
Abstract In this study, an algorithm was developed to represent the insulation state of uninterruptible direct current power supply systems, including circuitry. The existing insulation monitoring system in uninterruptible state was only possible with attachment type devices, but there was no portable inspection equipment at the site. This algorithm is called asymmetric high resistance detection (AHRD), which can compensate for the shortcomings of existing pulse and passive measurement methods, like not being able to measure when both positive and negative electrodes are poorly insulated. The researchers then developed a device that uses this algorithm for the on-site testing of direct current power supply systems, such as solar power generation units and energy storage systems (ESSs). Conversion and estimation formulas were also developed and verified by analyzing the correlation between the measurement values and simulation results of the device’s sensor parameter settings. A standard power supply and standard resistance were used on the newly developed insulation meter to assess it using a lab test and a performance test. Its performance is verified through a comparative analysis between the newly developed insulation meter with the existing insulation monitoring device at an ESS site. Applying the technology proposed in this study at testing sites can enable the verification of the insulation state of circuitry and direct current power supply systems, thereby preventing accidents by ensuring electrical safety. Keywords Insulation resistance · AHRD algorithm · DC power system · Uninterruptible · Inspection instrument
1 Introduction
* Ki‑Yeon Lee [email protected] Seung‑Taek Lim [email protected] Dong‑Ju Chae [email protected] Dong‑Woo Kim [email protected] Young‑Bae Lim [email protected] In‑Ho Ryu [email protected] 1
Electrical Safety Research Institute, Korea Electrical Safety Corporation, Wanju, Korea
Department of IT Applied System Engineering, Jeonbuk National University, Jeonju, Korea
2
Following the implementation of the 3020 Policy of the Korean government, the use of environmentally friendly energy systems—such as a direct current power supply systems, photovoltaic (PV) generation, and energy storage systems (ESSs)—has been on the rise, and with it, came a spike in the number of fire accidents [1, 2]. The Korea Electro-Technical Code defines certain minimum safety requirements for accident prevention. However, the majority of the requirements are dedicated to alternating current power supply systems, while rules for direct current power supply systems are inadequate. Furthermore, testing direct current ci
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