Relay switching at zero-crossing point of grid voltage to eliminate the EFT interference

Gu, Zhenghua; Zeng, Qingsheng; Xiao, Xin; Huang, Minchao

doi:10.1109/isemc.2018.8393988

Cited by 3 publications

(2 citation statements)

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“…One category of electrical devices that are generally controlled by relays is electronic ballasts which switch ON and OFF in response to a sensor device such as motion detection. Figure 4 shows a block diagram of the relay switching technology proposed by [3]. Zero crossing detection circuit will cause the synchronous circuit to know the points of the mains voltage passing zero.…”

Section: Relay Switching Technologymentioning

confidence: 99%

“…Thus, voltage flickers can be routinely experienced in the power grid during interruptions of heavy loads caused by the surging of the relay contacts [1]. The worst case is switching the relay at 90 degrees to the mains voltage [2], which can cause the mains voltage to flicker and affect the operation of network-connected electrical and electronic devices and cause malfunctions, communication errors, system shutdown or restart, and so on [3]. Figure 1 shows an electric arc between the contacts and the relay which is switched off at the 90 degree phase of the mains voltage.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Simulation of Current Zero Crossing Time Interval Under Different Loads

Sutaya¹,

Ariawan²,

Nurhayata³

2021

Proceedings of the 4th International Conference on Innovative Research Across Disciplines (ICIRAD 2021)

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This paper discusses the use of zero-crossing in switching for three types of loads, namely resistive, inductive, and capacitive. The switching process using zero crossings and not using zero crossings was simulated with MATLAB software and then the simulation results were analyzed. The results of the simulation and analysis show that in resistive loads with zero-crossing the switching process to break the connection between the voltage source and the load there is no voltage at the terminals so as to prevent the occurrence of arcs in the switch device. Whereas inductive loads, the use of zero-crossing is able to prevent the arcs going from source to load, but unfortunately because the current and voltage are in different phases, so when switching at the zero voltage point the current is not at zero, so the reverse current will be able to cause the arcs in the switch device. In capacitive loads, the addition of zero-crossing will prevent the occurrence of arcs in the switch device. When the voltage is switched at zero, it means that the voltage on the capacitive load is also at zero. The reverse voltage of a capacitive load is determined by the final voltage of the source. The time interval for a voltage to zero is also shown in the simulation so that it can be used by electronics practitioners in building electronic devices that use switching for large currents.

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Section: Relay Switching Technologymentioning

confidence: 99%