38results about How to "Solve breakdown problem" patented technology

The invention discloses a CVT capacitor online monitoring method based on CVT secondary voltage monitoring, and the method comprises the steps: S10, carrying out the parallel reading of at least one CVT secondary voltage value and a change speed through a plant station monitoring system, and setting a reference voltage; S20, carrying out the statistics of the duration time of all CVT secondary voltage changes, carrying out the filtering of the secondary voltages of all CVTs, and switching to step S30 if the secondary voltage change speed of one CVT is greater than a set change speed; S30, calculating the difference between the CVT secondary voltage value and the reference voltage: judging that the secondary voltage of the CVT is abnormal if the difference is greater than or equal to a first voltage threshold value or the duration time exceeds the set time, and switching to step S40; S40, judging whether the difference between the CVT secondary voltage value and the reference voltage is located between the first voltage threshold value and a second voltage threshold value nor not: judging the capacitor breakdown of the CVT if the difference is located between the first voltage threshold value and the second voltage threshold value. Through the CVT secondary voltage, the method can accurately judge the operation condition of a CVT capacitor, carries out deep processing through employing the data of the plant station monitoring system, does not need to add equipment, and improves the reliability.

The invention provides a control method for a multilevel inverter, and is applied to a multilevel inverter circuit. The multilevel inverter circuit comprises a first capacitor, a second capacitor, a third capacitor and eight switching branch circuits. In the control method, when a wave enveloping signal is received, the third and fourth switching branch circuits are controlled to be switched on, and the other switching branch circuits are controlled to be switched off. No voltage is borne at the two ends in the third switching branch circuit by switching on the third switching branch circuit, and meanwhile, no voltage is also borne at the two ends in the fourth switching branch circuit by switching on the fourth switching branch circuit, so that the problem of switching tube breakdown caused by high voltage stress on a switching tube during wave enveloping in the prior art is solved. In addition, according to the scheme, after a preset time is reached, the third and fourth switching branch circuits are also controlled to be switched off to make the multilevel inverter in an off state.

The invention discloses a CVT capacitance on-line monitoring method based on zero sequence voltage monitoring. The method comprises the steps of: S10, parallelly reading the zero sequence voltage of at least one CVT by a plant station monitoring system, wherein the zero sequence voltage is normal if only deviating from normal values; S20, querying each CVT for detecting whether each zero sequence voltage exceeds a first voltage threshold, and for one CVT, if the zero sequence voltage thereof is larger than or equal to the first voltage threshold, entering a step S30; and S30, counting the abnormity duration time of zero sequence voltage of the CVT, judging whether the zero sequence voltage of the CVT exceeds a second voltage threshold, if the zero sequence voltage is smaller than the second voltage threshold and the duration time is larger than a first set time, then determining that the capacitance of the CVT is broken down. The operation condition of the CVT capacitance is accurately judged by the utilization of the zero sequence voltage of the CVT, deep processing is carried out by the utilization data of the plant station monitoring system, no equipment needs to be added, and the reliability is improved.

The present application discloses an organic optoelectronic device, comprising a substrate, and a first electrode layer, an organic functional layer and a second electrode layer sequentially formed on the substrate; There is an over-electric confinement layer in parallel with the organic functional layer, and the over-electric confinement layer is formed of a pressure-sensitive material. In the present application, an over-electricity limiting layer connected in parallel with the organic functional layer is provided between the first electrode layer and the second electrode layer of the organic optoelectronic device. The resistance of the electrical confinement layer becomes smaller, allowing the current to pass through the over-electric confinement layer without damaging the organic optoelectronic device. When the voltage returns to normal, the resistance of the over-electric confinement layer returns to infinity, and the organic optoelectronic device can work normally.

The present invention provides a PBT permanent antistatic material and a preparation method and application thereof, and the PBT antistatic material is prepared from 5-25% of flame-retardant electrostatic-conductive dissipative masterbatch and 75-95% of PBT. In the method, the flame-retardant electrostatic-conductive dissipative masterbatch and the PBT are blended and extruded to obtain the PBT antistatic material, the PBT antistatic material reaches high oxygen index flame retardant V0 level, the volume resistivity is 10<6-8> Omega, the surface resistivity is 10<6-9> Omega, and the electrostatic decay time is greater than 10s, so that breakdown and serious harm due to static electricity of products in the various fields can be solved, and the PBT permanent antistatic material is non-dependence on temperature and humidity, is widely used in intelligent micro-electronics, electrical appliances, electrostatic sheet packaging, wires and cables, optical photovoltaic solar energy, machinery, medical equipment, electrostatic textiles of clothing and shoes, fire protection, military electrostatic equipment, electrostatic explosion-proof industry, gas electrostatic protection safety, firework electrostatic protection safety, petroleum and chemical energy and gas station electrostatic protection, and other fields.