XLPE cable is the primary transportation equipment in electric power system and Partial discharge (PD) is the main cause which destroy electric power\\\’s cable insulated layer. On-line measurement of the XLPE cable insulated layer\\\’s Partial discharge is important method to detect hidden trouble, forecast equipment longevity and ensure electric power cable run on the safe side.T...

Power system over-voltage is a subject closely in correlation with equipment insulation. Over-voltage condition suffering on equipments can indirectly inflect whether insulation cooperation is reasonable. Power equipment on-line monitoring technology recently develops so rapidly, and it is a new technology that spans multi-disciplinary and is applied extensively in the power system. However m...

The insulation capability of High Voltage Storage Capacitors, which are the kernel elements of impulse power system, determines the service reliability of impulse power system. High voltage storage capacitors are charged under DC voltage and discharge in several microseconds. When the capacitors are in service, the insulation usually breaks down at impulse discharge stage. However, the insula...

The relative air density decreases with the increasing of altitude. Therefore, the discharge performance of air-gap and insulator string at high altitude regions is different from that of the referring standard conditions. This difference is one of the key question in the design of the external insulation. It is put forward that the correction of external insulation discharge voltage for the r...

It is necessary for on-line monitoring system for Metal Oxide Arrester (MOA) to detect its problem and ensure the safe operation of the power system.According to equivalent circuit of MOA, the characteristic of leakage current of MOA and some disturb factors are discussed. The actual methods including the total current method、 triphase grounding current methods、 capacitance current compens...

Partial discharge detection UHF online through ultra-high frequency transformer internal sensors to receive partial discharge by the ultra-high-frequency electromagnetic waves generated to achieve partial discharge detection and positioning, and to achieve interference.This paper analyses the domestic and foreign line partial discharge monitoring technology development, and has been developed...

By the statistic of related departments, thunderstorms happen averagely 2000 times all over the world every minute. Over 10000 persons are injured by thunders in the seven seas, the losses of thunders reach 5-10 billion￥in China. The remote thunder monitoring system can reduce the losses of thunders by monitoring thunder alarms remotely, which main function is similar with automatic alarm sy...

In china, resonance grounding is commonly adopted in distribution network, by which power supply reliability and security can be enhanced. The earth capacitive current is therefore increased with the expansion of network scales. When the current is greater than the permitted value, it is recommended to install arc suppression coil(ASC) equipment by which the earth capacitive current can be cou...

The fiber optic composite overhead ground wire(OPGW) is the compound that gather the function of fiber optic correspondence and transmission line lightning arresting, is an important developping direction of the electric power special fiber optic cable .Along with the construction of the power system\\\’s fiber optic correspondence network, OPGW beginning drive large-scale adoption .But...

The ground grid is vital to ensure the safe operation of substations, but corrosion of the ground leads and conductors often makes the performance fall down . When the ground fault occurs in the system, the great short current will burnout the grid, spread the emergency and damage the equipment and staff. Because the grid is under ground, large-area digging is adopted to discover the corrosion...