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The speed characteristic of moving contact is vital to the high voltage circuit breakers. But due to the contacts of high voltage circuit breaker are completely isolated by arc chamber, the common measurement methods have some disadvantages. In this paper, a new method for measuring the speed characteristics based on machine vision algorithm is developed. This noninvasive method just needs to draw...
The objective of this paper is to propose a quenching recovery time measurement method for superconducting fault current limiter used in DC circuit. The proposed measurement method includes an experiment circuit, in which there is a L-C discharging current source and a DC circuit breaker. The L-C current source can produce a high DC current which quenches the superconducting coil. Then the DC circuit...
The stray parameters of a double-break vacuum circuit breaker (VCB) have a significant influence on the voltage distribution of the two breaks. The stray parameters are equivalent to two main equivalent capacitors. The two main equivalent capacitors are the equivalent break capacitor (C1) and the equivalent capacitor between the middle point of the two breaks and earth (C2). The objective of this...
According to the IEC standards, test objects in back-to-back capacitor bank switching tests are subjected to inrush currents of 20 kA peak and 4250 Hz frequency during making operations. For vacuum interrupters (VIs), the contact surfaces may be seriously damaged by the high-energy arc of the inrush current. The field emission current characteristics reflect the surface microscopic conditions after...
The rising rate of short-circuit current in some DC systems is very high, using superconductor in DC systems can limit the fault current quickly far before the peak value of the fault current comes. However, superconductor may be destroyed by high current or long duration current. The objective of this paper is to illustrate impacts of high current on superconductor and long duration current withstanding...
There are various kinds of HVDC circuit breakers (CBs) so far, however, their current interrupting capability is limited. Therefore, A DC circuit breaker (DCCB) based on superconducting current-limiting technology and self-excited oscillation technology is proposed to enhance the current interrupting capability. The proposed DCCB has two modules in series, which are superconducting current-limiting...
According to the relevant IEC standards, the back-to-back capacitor banks switching tests need to withstand an inrush current of 20 kA (peak) with 4250 Hz frequency. For vacuum interrupters (VIs), the contact surfaces may be seriously damaged by the high inrush current. The objective of this paper is to investigate how the inrush current influences the field emission current of VIs under power-frequency...
To improve the existing small-size actuator for robotics, a control module in actuator was developed. After the control module was fixed in an actuator, the actuator would be capable of speed control, PVT position control and continuous trajectory tracking. Those functions are not supported by the existing actuators. The paper presents the development of control module in actuator. In the procedure...
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