In order to address the problems of the alarm setting value of the direct-current equipment in current transformer substations, this paper analyzes the checking charge-discharge results of the batteries and then proposes recommendable values of the direct-current busbar voltage alarming value,so as to offer help to the safe and reliable operation and the maintenance of the direct current system.

According to the principle of backup power switchover unit of LFP-965, LFP-965 unit can not distinguish two buses without voltage synchronously when public busbar voltage transformer and line voltage transformer are employed at the same time.

This article introduces an event about protection action causing by the decrease of busbar voltage in Xiaolangdi hydropower station, in order to make people pay attention to voltage management to ensure the safety and stability of power grid and generating units.

We proposed a new method to distinguish the lightning strikes and common short-circuit faults on the basis of the characteristic of the bus voltage signals using S-transform.

There are several factors leading to relatively low measured value of bus voltage,so the cause analysis and elimination are necessary.

To make the servo system have the expected functions,it s especially important for selection of DC bus voltage in servo driver.

The direct torque control(DTC) system fed by TSMC was proposed that to control the inverter to implement DTC,and to control the rectifier to correct input power factor,or improve the performance of the DTC system by controlling input current space vector or the scope of DC bus voltage.

The reason about weakly performance at low speed-lower ratio of voltage signal-to-noise (SNR) was analyzed,and proposed a novel method-adjustable DC bus voltage,to enhance the SNR as well as to improve the low speed performance.