Research on the Insulation Monitoring Devices for DC Power System Based on the Detection Technology of DC Bus to Grounding Capacitance

Luo, Zhijun; Ren, Xiaodan; Yang, Hao; Cai, Ganglin; Qing, Chu; Luo, Yanling

doi:10.2991/ifeea-15.2016.24

Cited by 3 publications

(2 citation statements)

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“…When the measured resistance value is below the set value, this branch circuit has a ground fault. Due to micro electro mechanical devices recently using numerous anti-interference capacitors as a transient voltage compensator, this increases the capacitance in the DC power supply system and results in larger capacitance current [12]. AC signal source injection to detect ground fault point thus is ineffective for ground fault detection of a branch circuit.…”

Section: Introductionmentioning

confidence: 99%

A Novel Online Insulation Fault Detection Circuit for DC Power Supply Systems

Liu¹,

Chang²,

Lin³

et al. 2018

SGCE

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This paper proposes a novel online insulation fault detection circuit to overcome the shortcomings of ungrounded DC power supply system for being unable to provide high sensitivity leakage current detection. A DC power supply insulation fault detection circuit includes a leakage current detector located in each branch circuit, and a positive voltage transient compensator and a negative voltage transient compensator respectively bridging the positive terminal and negative terminal of the power supply system. The positive and negative voltage transient compensators respectively include a charge circuit to allow an energy storage circuit to be charged. When grounding insulation deterioration takes place at the positive or negative terminal of the leakage current detector, a leakage current loop is formed so that energy storage elements discharge and the leakage current detector detects current variations on the positive and negative terminals, and issue an alarm signal or control cutoff of the circuit breaking elements. The experiment result demonstrates that this novel method is able to detect 1 mA/50 kΩ insulation fault to achieve the high sensitivity detection goal.

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Section: Introductionmentioning

confidence: 99%

A Novel Online Insulation Fault Detection Circuit for DC Power Supply Systems

Liu¹,

Chang²,

Lin³

et al. 2018

SGCE

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show abstract

“…On the contrary, if the value of the bridge parameter is high, the test data will have large deviation and the equipment maintenance cost will increase. Furthermore, it is difficult to detect the simultaneous decline of positive and negative insulation resistances to the ground with current technology (Luo et al, 2016). In order to detect the insulation state of each electrode, switchable bridges need to be installed in each branch.…”

mentioning

confidence: 99%

A novel distributing–collecting on-line insulation monitoring system and line selection technology for the DC supply system

Feng,

Ye,

Gao

et al. 2023

Front. Energy Res.

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At present, the power supply system of 5G base stations is a micro smart grid, it generally uses 240 V DC power supply with multiple branches, and leakage accidents will threaten personal and property safety, so it is vital to identify the fault line accurately and remove the faults rapidly. In this paper, the leakage phenomenon of transmission lines in the HVDC power supply system of a 5G communication base station is studied. To address the issue of multi-branch line leakage diagnosis and line selection in the 240 V DC system, a new distributed DC insulation monitoring and fault line selection technology and system are proposed. The distributed DC insulation monitoring line selection technology is used to collect the leakage current of each branch by setting a unique single-core DC leakage transformer and process the signal primarily. In addition, a high-resistance bridge switchgear is added to the bus bar. According to different leakage currents caused by the imbalance of the bridge before and after the switch, the insulation resistance of electrodes to the ground is calculated accurately, which solves the problem that the current technology cannot judge the fault of the positive and negative electrodes to the ground at the same time. Through both simulation and prototype experiments, the feasibility of this technology and system device in line insulation monitoring and line selection of the HVDC communication base station power supply system is verified.

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A High-Precision Insulation Inspection Method Based on the Double-Arm Unbalanced Bridge for Electric Ships

Zhang

et al. 2023

IEEE Sensors J.

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Research on the Insulation Monitoring Devices for DC Power System Based on the Detection Technology of DC Bus to Grounding Capacitance

Cited by 3 publications

References 0 publications

A Novel Online Insulation Fault Detection Circuit for DC Power Supply Systems

A Novel Online Insulation Fault Detection Circuit for DC Power Supply Systems

A novel distributing–collecting on-line insulation monitoring system and line selection technology for the DC supply system

A High-Precision Insulation Inspection Method Based on the Double-Arm Unbalanced Bridge for Electric Ships

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