This article uses ATP-EMTP software platform to analyze the electromagnetic transient process of the reactive power compensation system. Simulation results show that the closing surge of inputing capacitor and the reignition overvoltage are the most serious damage on the system electromagnetic transient process. This article also discussed the renewed measures on the reignition overvoltage and calculated the maximun voltage after installing protective equipment, to provide a reliable basis for the safe operation of the system.

This article uses IES electromagnetic field calculation software to simulate the internal electric field distribution of shunt capacitors, and discusses a variety of electrode on the capacitor. Simulation results show that folding prominent forms of capacitor electrode has the best performance of partial discharge. On this basis, the paper also discusses the internal capacitor plate structure parameters" influence on the internal electric field distribution of shunt capacitors, to provide feasible suggestion for the production and selection of reactive compensation equipment.

The interactions on gold active and migratory quantities and rates between tuffaceous slate and solutions with different compositions were experimentally studied at 200 °C, 20 MPa, in a high-pressure apparatus. After reaction, tuffaceous slate became light colored and soft, and its mass density reduced. The amount of gold extracted from tuffaceous slate ranges widely, from 0.027 to 0.234 µg/g. Chlorine solution may activate appreciable amount of gold, and the gold migratory rate is high enough, from 50.70% to 92.30%, which reveals that sulphur and chlorine work together in solutions to accelerate gold activation and migration, and to realize gold mineralization in favorable places.

As there is a need for drilling fluid stability under high salinity conditions, the rigid polyelectrolyte xanthan was evaluated as a component in clay/polymer suspensions. A study of polymeric stabilization, rheological properties and thermal stability of the suspensions was carried out.Xanthan solutions are generally stable in the presence of high concentrations of NaCl, within the pH range 6-10. However, the stability in the presence of calcium depends on the nature of the xanthan sample, especially on the degree of pyruvate substitution.The stability of clay/xanthan suspensions is affected by the nature and concentration of electrolytes. A minimum xanthan concentration is required to stabilize the suspension. The mechanism is probably a combination of electrostatic and steric stabilization. Consequently, stabilization efficiency is affected by the dependence on salinity of xanthan and clay particle interactions.The viscosity of clay/xanthan suspensions decreases as salinity increases, even with divalent Ca2+ cations. But temperature dependence of the viscosity is associated with the ordered-disordered conformational transition of xanthan, which depends on salinity. In addition, the thermal stability of the suspension is ensured by the double-stranded rather than single-stranded xanthan molecules. The suspensions are intact up to 120-degrees-C at relatively high salinity.

Volume changes of polymer networks composed of ionizable functions depend on the nature of the solvent, the pH and the ionic strength. We have studied the dependence of volume changes (swelling ratio) of partially hydrolyzed polyacrylamide (PHPA) gels as a function of pH and ionic strength. The swelling force (the force exerted by the polymer network when it is confined in a cell of constant volume) of a gel composed of ionizable functions depends on pH and ionic strength. The variation of gel volume or swelling force involves a chemo-mechanical energy conversion. This aspect is briefly discussed. In addition, the variation of swelling properties of these polyelectrolytic gels has been compared with the variation of rheological properties of a solution of the same polyelectrolyte.