66results about How to "Reduce power outage time" patented technology

The invention discloses an automatic passage method through phase splitting for an AC-DC-AC electric locomotive which comprises the following steps: before the electric locomotive runs into a neutral section, a traction control system controls a traction motor to work in a regenerative braking mode and controls an inverter to stabilize intermediate DC voltage; a pulse rectifier works in an inversion state; an alternating voltage equal to a traction voltage is generated on the primary side of a traction transformer, thereby making the primary side of the traction transformer obtain zero current from a power supply arm; after the electric locomotive runs into the neutral section, the intermediate DC voltage still maintains stability; the AC phase generated by the inversion of the pulse rectifier in the inversion mode changes gradually so as to make the voltage of the primary side of the traction transformer change to become equal to the traction voltage of a next power supply arm; and then the electric locomotive enters the next power supply arm and runs normally. The method enables the automatic passage through phase splitting; in addition during the phase splitting, a main circuitbreaker does not need to be turned on and off without arc discharge, interception overvoltage and closing surge overcurrent, and an auxiliary system is not deenergized; and the passage through phase splitting has short time, low traction loss and small speed drop.

The invention provides an MBUS control circuit for a temperature control valve. The MBUS control circuit for the temperature control valve comprises a single chip microcomputer for controlling the temperature control valve, a rectifying circuit in bus connection with MBUS, and a power supply circuit connected with the rectifying circuit and used for supplying power to the single chip microcomputer. The power supply circuit comprises a 6mA constant current source for providing a basic working current to the single chip microcomputer, a 20mA controllable constant current source for providing a large current to the single chip microcomputer and receiving a signal sent by the single chip microcomputer, and a constant-current control circuit for receiving a host signal; the 20mA controllable constant current source comprises a constant current source I1 and a control circuit for receiving the signal of the single chip microcomputer; and a receiving circuit for converting a high-low level sent by a host into a high-low level signal recognized by the single chip microcomputer is connected onto the rectifying circuit. According to the MBUS control circuit for the temperature control valveprovided by the invention, the adopted 20mA controllable constant current source receives a slave signal so as to accomplish data interaction with the host, and the adopted receiving circuit can convert the high-low level on the host into the signal recognized by a slave, so that the problems of power supply and communication between the host and the slave are solved through two power lines.

The invention provides a disconnection-free testing method for high voltage electric equipment in a transformer substation. The method includes steps of a, cutting off power of the equipment in the transformer substation, disengaging a switch on a grounding side of a circuit breaker and engaging the circuit breaker, disengaging a neutral point grounding switch of a voltage transformer, disengaging a voltage transformer side switch, moving a handcart in a switch chamber to an operation position and disengaging the grounding switch; b, measuring the integral resistance of all the equipment; c, connecting a DC leaking equipment to a high voltage side single-phase conductor of a main voltage transformer, boosting voltage slowly after wiring, maintaining for one minute after the voltage is boosted for 1 / 10 each time during the boosting process, reading the leaking current value until the leaking current value lasts for one minute in a full voltage condition; d, drawing a volt-ampere characteristic curve according to the read voltage, current and time. Since the above technical scheme is adopted, the testing duration can be reduced effectively and the working efficiency is improved. The testing demand for saving the equipment disconnection process is realized, the line power-off time is reduced and great social benefits and economic benefits are achieved.

The invention provides an urban power distribution network recovery method considering mobile emergency resource scheduling. The method comprises the following steps of: establishing a mobile power generation resource constraint model considering the constraint of the time when mobile power generation resources arrive at a fault; establishing a topology constraint model considering the constraint of repairing the line by maintenance personnel; establishing a multi-period urban power distribution network fault recovery model considering mobile emergency resource scheduling by taking weighted power supply time maximization of a load as a target and taking an operation constraint, the mobile power generation resource constraint model, the topology constraint model and a load state constraint as constraint conditions; and solving the multi-period urban power distribution network fault recovery model considering mobile emergency resource scheduling, and carrying out mobile emergency resource scheduling on an urban power distribution network according to a solving result. According to the method, the optimal recovery strategy can be obtained, so that the purposes of rapidly generating a recovery strategy, guaranteeing important load power supply and reducing load power-off time are achieved.

The invention provides a multifunctional universal operation handle, belongs to the related fields of electrical power generation, power transformation or power distribution, is a tool for power equipment, and particularly relates to a multifunctional operation handle for a power distribution station, a box type substation and a loop network unit for power supply or power distribution. The multifunctional universal operation handle comprises a detachable head, a connector, an adapter, an operation handle and a key hole, wherein an internal hexagonal connecting hole is formed in one end of the adapter, and the adapter is sheathed on the operation handle through the internal hexagonal connecting hole, and is connected with the operation handle; an outer hexagonal head is arranged at the other end of the adapter; an outer hexagonal head is arranged at one end of the detachable head, and the outer hexagonal head at the adapter is connected with the outer hexagonal head at the detachment head through the connector; an outer hexagonal head is arranged at the initial end of the operation handle, and the outer hexagonal head at the operation handle is connected with the detachable head through the connector; a key containing cavity is arranged in the tail end of the operation handle, a key container is arranged in the key containing cavity, and a key is contained into the key container, so as to realize the integral management of the key.

The invention discloses an energy storage system grid-connected and off-grid switching system and switching method. The system comprises a grid-connected and off-grid switching device STS and a bidirectional energy storage converter PCS, wherein the grid-connected and off-grid switching device STS comprises a controller, a thyristor SCR, a first-stage relay and a second-stage relay, a first-stage relay and a second-stage relay in the main circuit of the grid-connected and off-grid switching device STS are sequentially connected, the thyristor SCR is connected to the second-stage relay in parallel, and a controller in the control circuit of the grid-connected and off-grid switching device STS is connected with the two-stage relay and the thyristor SCR. According to the invention, the SCR is connected to the two ends of the relay in parallel, signals can be sent to the SCR and the relay at the same time when the relay is disconnected from the grid, and due to the fact that the semiconductor switch speed is high, the SCR can be switched on firstly, so that no voltage difference exists between the two sides of the relay when the relay acts, and arc discharge and relay adhesion cannot be caused when the relay is disconnected.

The invention discloses a plug-in type small circuit breaker, comprising a circuit breaker socket and a circuit breaker body. A dovetail slot adapted to be installed with the circuit breaker body is arranged on the circuit breaker socket. The circuit breaker socket is provided with an inlet terminal assembly and an installation hole connected with an external wire. The circuit breaker body comprises a housing and a conductive plug, wherein a movable contact assembly, a static contact assembly, a double-gold protection assembly, an outlet terminal assembly, an arc extinguishing system and a handle for controlling the two to be turned on or off are arranged in the housing; Wherein the conductive plug extends out of the housing, and the conductive plug is connected with the conductor of the static contact assembly; The outlet terminal assembly is provided with a conductive plate, a terminal frame and a fastening screw which are electrically connected with the exterior; As that conductiveplate of the outlet terminal assembly is connected with the terminal frame and the outlet side, the circuit breaker body can be quickly insert and extracted from the mounting groove of the circuit breaker socket for installation and replacement, and the circuit break body is convenient for users to use safely.

A printing apparatus includes a printing unit for performing printing by pressing a thermal head onto heat sensitive paper to heat the heat sensitive paper. A battery supplies a voltage to the thermal head, and a battery voltage detecting unit detects the voltage. A printing control unit changes, according to the detected voltage, a power-off time in which power supply from the battery to the thermal head is stopped. The printing control unit calculates the power-off time based on the detected voltage and the resistance of the thermal head and shortens the power-off time as the detected voltage becomes lower thereby shortening the overall printing time without shortening the life of the heating resistance elements of the thermal head.

The invention discloses a method for manual switching automatic judgment under the condition of different-network power supplies serving as station service power supplies and aims to mainly solve theproblem of equipment tripping caused by the fact that a switching mode steps into synchronous switching or long-delay switching under the condition of different-network power supplies serving as station service power supplies. The method comprises the following steps that: (1) whether the two different-network power supplies can be quickly switched through the automatic starting of a quick switching device, and a starting mode of the quick switching device is selected; (2) a quick switching device manual starting quick switching judgment condition is added into manual switching logic in the logic configuration of a DCS; and (3) during manual quick switching operation, the DCS automatically captures a quick switching device manual quick switching judgment condition and automatically issuesa manual starting quick switching logic. According to the method of the invention, through the existing signal output function of the quick switching device and on the basis of the manual logic modification of the DCS system, automatic quick switching selection in a manual mode is realized, and the power-off time during the switching of the two different-network power supplies is reduced, and theabnormal tripping probability of auxiliary equipment of a power plant is greatly reduced.

The invention discloses an active arc extinguishing method, which is used for arc extinguishing of a mechanical switch; a second power supply branch connected in parallel with the first power supply branch is provided for the load outside the first power supply branch composed of a power supply and a mechanical switch. power supply branch, and control the second power supply branch during the opening process of the mechanical switch: first, so that the current I in the first power supply branch at time t n =I n_ref In order to control the target, control the second power supply branch to inject current into the first power supply branch, t is the physical opening time or a certain time after that, the target current I n_ref The direction of the voltage of the power supply at time t is opposite to that of the power supply; then, the output voltage of the second power supply branch is controlled with the voltage phase at both ends of the load tracking the voltage phase at both ends of the load under the condition of power supply as the control target, and the output voltage of the second power supply branch is controlled for at least the duration time for one cycle of the power supply. The invention also discloses an active arc extinguishing device, a circuit breaker and an automatic transfer switch. The invention can realize the effect of rapid arc extinguishing.

The invention discloses an emergency power supply device for a box-type substation. The emergency power supply device comprises an emergency power supply, a dual power supply changeover switch and a handle assembly. The outgoing end of the dual power supply changeover switch is electrically connected with a low voltage shunt switch. The handle assembly is used for controlling the incoming end of the dual power supply changeover switch to switch on the emergency power supply or the transformer, When the emergency power supply is needed for power supply, the incoming end of the dual power supplychangeover switch is enabled to be connected with the emergency power supply by the handle assembly so that the emergency power supply can be quickly realized and the power failure time on the user side can be greatly shortened.

The invention discloses a wireless binary channel detection device, comprising a GPRS wireless communication module (5), a CDMA wireless communication module (6), an antenna, a SIM card, and a power supply circuit (10) which are interconnected. The wireless binary channel detection device is characterized in that the GPRS wireless communication module (5) and the CDMA wireless communication module (6) are connected to a simulation channel switching circuit (7); the simulation channel switching circuit (7) comprises a signal processing 89C2051 circuit (7-1)and a relay or a simulation electronic switch (7-2); the signal processing 89C2051 circuit (7-1) is connected to the GPRS wireless communication module (5) and the CDMA wireless communication module (6);and the relay or the simulation electronic switch (7-2) is connected to the RS232 conversion circuit (8) and the RS485 conversion circuit (9) which are connected to the external ports. The wireless binary channel detection device is stable in operation, improves the access rate of the wireless network, saves the investment, effectively shortens the outage time, provides a safe channel environment to the operation of the distribution network and supports the dual-network simultaneous operation.