4 results about "Secondary loop" patented technology

The invention discloses a feedforward-feedback composite control method and a control system for the pressure and the liquid level of a nuclear power station voltage stabilizer. A voltage stabilizer liquid level set value is recalculated; a new voltage stabilizer liquid level set value is only relevant to the average temperature set value of a loop cooling agent at current power and zero power; mismatched signals of primary loop reactor power and a secondary loop stream turbine power are taken as feedforward signals, and are introduced into a pressure and liquid level control system of the voltage stabilizer, thereby forming a feedforward-feedback consistency control scheme; the liquid level and the pressure of the voltage stabilizer can be subjected to corresponding compensation control in advance, so that the control effect of the voltage stabilizer is enhanced, the voltage stabilizer can reach a stable state more rapidly, and the stability of a pressurized water reactor nuclear power unit during frequency and peak load modulation is further enhanced.

The invention relates to a method and a device for preventing a direct-current system of a power transformation and distribution substation from powering off during storage battery maintenance, belonging to the field of direct-current power supplies. The method comprises the following steps of: connecting a storage battery current relay between the anode and the cathode of a storage battery adjacent to the storage battery to be replaced to structure a direct-current bypass loop; making the charging/discharging current of a storage battery pack of the direct-current system circulate in the storage battery to be replaced by using the storage battery current relay; replacing the storage battery to be replaced; and after finishing the maintaining work, removing the electrical connection between the storage battery current relay and the storage battery loop, thereby ensuring that the original circulating loop of the charging current or discharging current of the storage battery pack of the direct-current system of the power transformation and distribution substation is recovered. The method and the device ensure continuous power supply to a secondary loop system in the process of processing the defects of the storage battery, improve maintenance working efficiency, are also convenient for maintainers to timely master the working conditions of the direct-current system, and can be widely used in the overhauling/maintaining field of direct-current power supply devices in an electric transformation and distribution system.

The invention relates to a transmission analysis-based graphical expressing method. The transmission analysis-based graphical expressing method comprises the following steps of S1, analyzing an SCD file to obtain SCD information; S2, performing sorting and storing on the analyzed SCD information to establish index; S3, connecting substation data and analyzing the data; and S4, performing graphical expressing on the data obtained by analysis. By adoption of the transmission analysis-based graphical expressing method, virtual secondary loop graphical form and secondary loop restoration can be realized; in addition, an interaction process of a whole event can be described exhaustively in a dynamic form through a progressive expressing way, so that checking of the event and verification of the secondary loop can be performed conveniently, and quick fault positioning by an operation and maintenance staff can be realized conveniently.

The invention relates to a magnetic integration device for a planar transformer and an inductor. The magnetic integration device comprises a magnetic core, wherein two opposite circuit board windingsare arranged on the magnetic core; the two circuit board windings and a discrete winding are coupled together through the magnetic core; and the two circuit boards belong to a primary loop and a secondary loop respectively and are insulated from each other and are only magnetically coupled; and the circuit boards are electrically connected to a switch tube group.