Protection and Control Standards with Auto Diagnosis for the Motor in Low-Voltage Switchgear According to Industry 4.0

The article is a review of the latest available technologies on the market which are part of “Industry 4.0”, in the field of protection, control, and power supply of equipment. The authors focus on the development of the protection devices (PLC controllers), which can be used not only for protection purposes but also for the diagnosis and monitoring of the entire system. The key element is the communication structure involving protection, main PLC controller, and DCS, which has an impact on the reliability of the whole system. The authors compare different solutions that allow increasing the reliability of the system (ethernet connection), compared to the classic system (wire connection). Universal protection devices are more flexible devices compared to classic control equipment, but also allow us to make modifications to the structure after commissioning, during normal operation of the system without stopping the technological process.

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An Adaptive Differential Protection and Fast Auto-Closing System for 10 kV Distribution Networks Based on 4G LTE Wireless Communication

Future Internet ◽

10.3390/fi12010002 ◽

2019 ◽

Vol 12 (1) ◽

pp. 2 ◽

Cited By ~ 1

Author(s):

Wen An ◽

Jun Jie Ma ◽

Hong Yang Zhou ◽

Hong Shan Chen ◽

Xu Jun ◽

...

Keyword(s):

Control System ◽

Wireless Communication ◽

Power System ◽

Power Supply ◽

Distribution Networks ◽

Fault Isolation ◽

Differential Protection ◽

Current Differential Protection ◽

Protection And Control ◽

And Control

With the development of wireless communication technology and computer technology, more and more smart technologies have been applied in electricity distribution networks. This paper presents an adaptive current differential protection and fast auto-closing system for application in 10 kV distribution networks in China Southern Power Grid. The current differential protection can adaptively change its settings according to the topology change of the primary distribution networks, thus the system effectively reduces the operation and maintenance cost of the power distribution network. In order to restore the power supply for the healthy part of the 10 kV networks quickly after a power system fault is cleared, the protection and control system provides wide area control function for automatic fault isolation and automatic switching. The traditional overcurrent protection and control system have no fault location function, it may take several minutes or even hours to manually locate a fault and then restore the power supply. Compared with the protection and control system of the traditional 10 kV distribution networks, the system developed can locate and isolate faults within 900 ms (assuming that the operating time of the load switch is 700 ms), and can quickly restore power supply in less than one second after a power system fault is cleared.

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Design of a Microcontroller-Based Passive Standby Uninterruptible Power Supply

International Journal of Electrical Engineering Education ◽

10.7227/ijeee.38.4.6 ◽

2001 ◽

Vol 38 (4) ◽

pp. 330-337

Author(s):

M. I. Jahmeerbacus ◽

K. M. S. Soyjaudah

Keyword(s):

Power Supply ◽

Systems Approach ◽

Top Down ◽

Uninterruptible Power Supply ◽

Control Functions ◽

Uninterruptible Power ◽

Protection And Control ◽

And Control

This paper describes the design of a microcontroller-based passive standby Uninterruptible Power Supply (UPS), where the student applies a top-down systems approach to produce a working system. Such a project involves hardware-software co-design for realizing the relatively large number of detection, protection and control functions within the UPS.

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Detection of Ozone and Nitric Oxide in Decomposition Products of Air-Insulated Switchgear Using Ultraviolet Differential Optical Absorption Spectroscopy (UV-DOAS)

Applied Spectroscopy ◽

10.1177/0003702818773091 ◽

2018 ◽

Vol 72 (8) ◽

pp. 1244-1251 ◽

Cited By ~ 4

Author(s):

Yalong Li ◽

Xiaoxing Zhang ◽

Xin Li ◽

Zhaolun Cui ◽

Hai Xiao

Keyword(s):

Detection Limit ◽

Optical Absorption ◽

Absorption Spectroscopy ◽

Differential Optical Absorption Spectroscopy ◽

Normal Operation ◽

Optical Absorption Spectroscopy ◽

Decomposition Products ◽

Protection And Control ◽

And Control

Air-insulated switchgear cabinets play a role in the protection and control of the modern power grid, and partial discharge (PD) switchgear is a long-term process in the non-normal operation of one of the situations; thus, condition monitoring of the switchgear is important. The air-insulated switchgear during PD enables the decomposition of air components, namely, O3 and NO. A set of experimental platforms was designed on the basis of the principle of ultraviolet differential optical absorption spectroscopy (UV-DOAS) to detect O3 and NO concentrations in air-insulated switchgear. Differential absorption algorithm and wavelet transform were used to extract effective absorption spectra; a linear relationship between O3 and NO concentrations and absorption spectrum data were established. O3 detection linearity was up to 0.9992 and the detection limit was at 3.76 ppm. NO detection linearity was up to 0.9990 and the detection limit was at 0.64 ppm. Results indicate that detection platform is suitable for detecting trace O3 and NO gases produced by PD of the air-insulated switchgear.

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Application of Modbus Communication Technology in Steam Injection Control System of Thermal Recovery Station

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.241-244.2362 ◽

2012 ◽

Vol 241-244 ◽

pp. 2362-2364

Author(s):

Yu Heng Zhu ◽

Bao Liang Liu

Keyword(s):

Communication Technology ◽

Power Supply ◽

Steam Injection ◽

Thermal Recovery ◽

Fuel Oil ◽

Normal Operation ◽

Steam Generation ◽

Injection Control ◽

Water Supply And Treatment ◽

And Control

Steam generation and injection in thermal recovery station constitute a very complicated HPHT system, mainly including power supply, water supply and treatment, fuel oil or gas regulation, steam and gas separation, safety and protection etc. To ensure normal operation of the system and realize centralized intelligent management and control, Modbus communication technology is used for configuration and connection of hardware and selection of software. The result shows that sub-systems of steam injection station such as intelligent power supply etc are well integrated.

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