41results about How to "Ensure continuity of power supply" patented technology

The invention provides an on-line three-phase load unbalance processing method suitable for a low-voltage distribution network. The on-line three-phase load unbalance processing method comprises the following steps of: monitoring three-phase load by three-phase load monitoring units on the low voltage side of a distribution transformer, and transmitting monitoring data to three-phase load unbalance monitoring units of the distribution transformer; judging whether the three-phase load unbalance exceeds a standard value or not by the three-phase load unbalance monitoring units of the distribution transformer; if the three-phase load unbalance exceeds the standard value, transmitting signals to an on-line load phase modulation control unit by a communication unit; judging whether the three-phase load unbalance of the distribution transformer is caused by the three-phase load unbalance of a main low-voltage circuit or not by the on-line load phase modulation control unit; and if so, setting an on-line load phase modulation strategy according to the monitoring data of the load monitoring units of branches of three phases of the main low-voltage circuit, sending a control command to an on-line load phase modulation switch combination unit by an on-line load phase modulation judging and controlling unit, and switching the load phases of the branches of users so as to realize the on-line three-phase load unbalance processing.

The invention discloses a non-stick overvoltage and under-voltage protector with a leakage protection function. The non-stick overvoltage and under-voltage protector comprises a box body and a control unit, wherein the control unit comprises a power circuit (1), a current sampling circuit (2), a voltage sampling circuit (3), a microprocessor (4), a key processing circuit (5), a working state indicating circuit (6), a magnetic relay driving circuit (7), a magnetic latching relay (8), a leakage mutual inductor (9), an energy-storage capacitor (10) and a chip peripheral circuit (11). According to the non-stick overvoltage and under-voltage protector with the leakage protection function provided by the invention, a power supply is switched on automatically when the power voltage restores to a normal voltage range after an under-voltage protection action is taken, so that the continuity of power supply is ensured, and the power supply quality is ensured; and after a leakage protection action is taken, the power supply is switched on automatically after a fault is cleared and a manual key is pressed for confirming, the power supply continuity is ensured, and personal safety is protected.

The invention provides a parallel online automatic commutation device of a low-voltage load. The commutation device comprises a control circuit, an input module, a commutation switch module and an output module; and the control circuit receives a commutation phase sequence state instruction sent by a distribution and transformation terminal, calculates an operation instruction of the commutation switch module, and realizes online commutation of the low-voltage load. The invention also provides an operation method of the device. The operation method comprises that 1) the three-phase voltage of power grid, a current of the low-voltage load and a phase sequence state when the low-voltage load is connected to the power grid are collected; 2) the commutation phase sequence state instruction is calculated; and 3) the operation instruction of the device is calculated, and online commutation of the low-voltage load is realized. Compared with the prior art, the device and operation method thereof use an intelligent optimized algorithm to optimize and select the phase sequence state combination of the low-voltage load in a power distribution district, and change the low-voltage load randomly among phases A, B and C, and three-phase loads in the power distribution district are balanced.

The embodiment of the present invention discloses a power supply control circuit and method of a mobile terminal and a power supply management module. The power supply control circuit comprises an external power supply input end, a battery, a voltage conversion module, a first switch, a mainboard, the power supply management module, a voltage comparison module, a switch control module and a voltage stabilization capacitor. The voltage comparison module and the power supply management module are connected with the switch control module, and the switch control module is connected with the first switch. The switch control module is used to control the first switch to connect an external power supply circuit if the voltage comparison module determines that an external power supply inputted by the external power supply input end satisfies a threshold condition, and the power supply management module outputs an instruction for connecting the external power supply circuit, so that the battery does not supply power, the situation that the battery is charged while discharging can be reduced, the charge and discharge times of the battery can be reduced, and the service life of the battery is prolonged. Otherwise, the switch control module is used to control the first switch to connect a battery power supply circuit, thereby guaranteeing the power supply continuity to the mobile terminal.

The present invention discloses a distribution automation cabinet including a cabinet body and a plurality of drawer type cabinets. The cabinet body movably connects with the drawer type cabinets, and the drawer type cabinets are arranged in the cabinet body. The distribution automation cabinet is provided with a plurality of functional modules, and the functional modules are assembled in the distribution automation cabinet in a drawer manner for forming drawer unit modules. Compared with the prior art, the distribution automation cabinet provided by the present invention can be used as a standardized product for production, and various functional module equipment in the distribution automation cabinet can also be used as standardized products for production so as to match with any one ring network cabinet group provided by the prior art or available in the market. And the distribution automation cabinet significantly solves a security problem of outdoor opening and closing existed in the prior art, simultaneously, enhances supply electricity continuity of an outdoor opening and closing place, facilitates the development and management of smart power grids of our country, and therefore, the distribution automation cabinet has a wide application prospect.

The invention provides an electrified railway external power grid power supply structure. An external power grid comprises transformer substations and power transmission lines; the A-type transformer substation supplies power to the B-type transformer substation, the C-type transformer substation and the traction transformer substations through the corresponding power transmission lines, the B-type transformer substation supplies power to the C-type transformer substation and the traction transformer substations through the corresponding power transmission lines, and the C-type transformer substation supplies power to the traction transformer substations through the corresponding power transmission lines; it is defined that the traction transformer substations serve as leaves, the A-type transformer substation serves as a root, the B-type transformer substation and the C-type transformer substation between the A-type transformer substation and the traction transformer substations serve as nodes; through the power transmission lines, the A-type transformer substation, the B-type transformer substation, the C-type transformer substation and the traction transformer substations are connected into a tree-shaped-structure power supply network from the high-voltage level to the low-voltage level; as long as every two adjacent traction transformer substations (leaves) upwards retrospect and can find the same node or root, the intervening subarea substations can communicate, cut-through power supply is implemented, and an equalizing current cannot be generated; and every two corresponding power transmission lines are arranged into one set, capacity standby application is conducted, and traction power supply is not affected under overhauling or breaking down of bus bars of any power transmission line and transformer substation subsection.

The invention provides a novel commutation switch device. The device comprises a monitoring unit, a commutation switch unit and a compensation unit, wherein the monitoring control comprises a controlmodule, an analog quantity measurement module, a communication switch trigger and feedback module, a compensation trigger and feedback module and a communication module, the control module is used forreceiving a commutation command transmitted from the communication module and receiving a voltage/current signal acquired by the analog quantity measurement module, and information returned from morethan two modules is received by sending out a control command on the commutation switch unit and the compensation unit according to a certain control strategy. By the commutation switch device, the commutation time of a conventional commutation switch-type three-phase load unbalanced management device during the commutation process can be prevented, zero switching time can be achieved, and the power supply continuity is ensured.

The invention discloses a power distribution automation cabinet. The power distribution automation cabinet is composed of a cabinet body and a plurality of unit modules. Each unit module is movably connected with the cabinet body in a pulling-out manner and can be internally arranged in the cabinet body. Each unit module is provided with a plurality of secondary elements with different functions. The power distribution automation cabinet comprises a first power distribution cabinet and a second power distribution cabinet. The first power distribution cabinet is composed of a plurality of single-loop control protection unit modules. The second power distribution cabinet comprises a wiring terminal module, a DTU protection integration unit module, an ONU communication integration unit module and a power supply unit module. The first power distribution cabinet and the power distribution cabinet are electrically connected through the wiring terminal module. Compared with the prior art, the power distribution automation cabinet can be produced as a standard product, all function module equipment of the power distribution automation cabinet can also be produced and designed as standard products, and the power distribution automation cabinet can be matched with any kind of ring network cabinet group for usage; in addition, the safety problems of an outdoor switching station are solved, and the power supply continuity of the outdoor switching station is simultaneously improved.

The invention discloses a GIS-based distribution network emergency repair video command quick positioning system, which comprises an application server, a website server, a data server, a management working station, a magnetic disk array, a master station switch and a firewall. The GIS-based distribution network emergency repair video command system is in data exchange with a distribution network automatic master station system, a PMS system, a marketing management system, a 95598 system, a power utilization information acquisition system and a GIS system of a power system via the firewall, the master station switch and an information exchange bus, and a fault region is quickly positioned according to video data transmitted by a vehicle-mounted field monitoring device or a fixed tower monitoring device. The GIS-based distribution network emergency repair video command quick positioning system of the invention comprises the vehicle-mounted field monitoring device and the fixed tower monitoring device, power fault problems are acquired in multiple channels, the power fault can be quickly positioned by the distribution network emergency repair video positioning transmission system, and timeliness of emergency repair is ensured.

The invention discloses a residual current operated circuit breaker with a self-checking function. The residual current operated circuit breaker comprises a housing which is internally provided with aPCB control circuit assembly board, a residual current protection release, a zero sequence current transformer, an alarm indicating lamp, and a buzzer, wherein a main control chip and a silicon controlled rectifier connected with the main control chip are arranged on the PCB control circuit assembly board, the silicon controlled rectifier is simultaneously connected with the residual current protection release, and the zero sequence current transformer, the alarm indicating lamp and the buzzer are respectively connected with the main control chip. The residual current operated circuit breakeris advantaged in that, compared with the prior art, the residual current circuit breaker with the self-checking function can automatically perform periodic self-checking on whether faults exist or not without manual intervention, so power utilization safety of a user is further ensured, an electric connection state of the main circuit cannot be disconnected in the self-checking process, and powersupply continuity of related equipment can be ensured.

The invention discloses a laboratory isolation power supply insulation fault location system, which includes an isolation transformer and a test bench; the isolation transformer is sequentially connected in series with an insulation monitor and an external alarm, the external alarm is also connected with an alarm display, and the test bench is connected with a test In the control room, the test console is connected with the insulation monitor; the isolation transformer is also connected in series with the insulation fault tester and the insulation fault locator through the current transformer; the test bench includes several load circuits connected in parallel with the insulation fault tester, and the load circuit All are also equipped with switches and positioning transformers, and the positioning transformers on the load circuit are all connected to the insulation fault locator. The invention can quickly send out an alarm and locate a fault when a fault is found, provides a safe experiment platform for experimenters, protects personal safety and equipment safety, and has a certain improvement effect on teaching.

The present invention discloses a power distribution automation cabinet which comprises a cabinet body and a plurality of drawer type cabinets. The cabinet body is movably connected to the plurality of drawer type cabinets, and the drawer type cabinets are in the cabinet body. In addition, the power distribution automation cabinet also provided with a heat radiation component and a heat recovery system. The heat radiation component is arranged at the outer wall of the power distribution automation cabinet and does not communicate with the internal part of each cabinet. The heat recovery system comprises a rectangular box which is provided with an intake port, an air outlet, a heat exchanger and a storage battery. Compared with the prior art, the power distribution automation cabinet provided by the invention can individually supply the lighting system in the power distribution automation cabinet, the power distribution automation cabinet can be produced as a standard product, each function module equipment in the power distribution automation cabinet can be produced and designed as a standard product, thus the power distribution automation cabinet can be used with any ring main unit provided by the prior art or sold in the market, and thus the application prospect is very board.

The invention discloses a safe power utilization device, and the device comprises an isolation transformer composed of a commercial power side coil, a safe power side coil and a triangular winding; a first switch is arranged on a loop where the commercial power side coil is located, a second switch is arranged on a loop where the safe power side coil is located, and a third switch is arranged on a commercial power output circuit. A triangular winding is used for eliminating 3k-order harmonics so as to realize live switching. When the controller detects that the current value of at least one phase in the three-phase alternating current is larger than a first threshold value and the current value of each phase is smaller than a second threshold value (the second threshold value is larger than the first threshold value determined by the rated load of the isolation transformer and larger than the rated load), the state of power supply by the first switch and the second switch is switched into the overload emergency power supply state of direct power supply by the third switch, so the safe power utilization device can keep power supply under the condition of bearing a load exceeding a rated value of the safe power utilization device, devices of the safe power utilization device cannot be damaged, the power supply continuity is ensured, and the user experience is improved.

The invention discloses an uninterrupted switching device and method for a 400Hz intermediate-frequency power supply for a ship, and the device comprises a first voltage sensor, a second voltage sensor, a third voltage sensor, a current sensor, a first full-control power electronic apparatus, a second full-control power electronic apparatus, a first switch, a second switch, and a control circuit. According to the invention, a static switching thyristor is employed, and methods of rapid voltage and current detection and power loss judgment are also employed. Moreover, the switching operation can be completed within 2.5ms, thereby guaranteeing the continuity of power supply. A proper switching strategy and a protection logic are employed, such as no switching during load short circuit, the selection of a switching point, and so on, thereby guaranteeing the safety and reliability of a switching process. A mechanical-type bypass switch is added, and the reliability of power supply is improved.

The invention belongs to the technical field of switching and mainly provides an electric dazzling-preventing circuit and system. A working voltage source in an external circuit as well as a first voltage signal and a second voltage signal which are input by a bus bar voltage source are sampled, and a corresponding control signal is output according to a first voltage sampled signal and a second voltage sampled signal for selecting the first voltage signal or a second direct current voltage signal to supply power to an alternating current contactor, so that the electric dazzling-preventing circuit can controls the state of the alternating current contactor according to the state of the external circuit, a contactor coil and a main contact maintain closed, and power supply continuity of thecircuit is maintained, and the problems that power transmission needs to be carried out manually again after the electric dazzling phenomenon in an existing electric power system is finished and thepower supply continuity of a motor or emergency lighting is influenced are solved.

The invention discloses a low-voltage AC/DC power distribution mode conversion system and a sequential control method and device thereof, and relates to the technical field of power transmission and distribution of power systems. The system comprises a distribution power supply, a distribution line, a load, a sending end converter, a receiving end converter and a plurality of circuit breakers. According to the sequential control method of the low-voltage AC/DC power distribution mode conversion system, the states of the current and voltage in a system line are detected, the opening and closing actions of different circuit breakers are controlled, the power supply transmits power to the load through the sending end converter and the receiving end converter, and switching from an alternating current power supply mode to a direct current power supply mode is completed. The switching rapidity and reliability are ensured by determining the switching control scheme of the switches at the two sides by detecting the voltage and current change conditions at the two sides, the alternating-current power distribution mode is smoothly switched to the direct-current power supply mode when the terminal demand power is increased and the voltage drop is obvious, a communication line does not need to be additionally arranged, the cost is low, and the safety of components, such as the converter, etc., and the user power supply continuity can be ensured.