49results about How to "Does not affect normal power supply" patented technology

The invention provides a power supply circuit which comprises at least one main circuit and at least one assistant circuit; the at least one main circuit comprises at least one battery, a load and at least one main circuit switch controlling the connection of the main circuit; the at least one assistant circuit comprises a current limiting unit and a current pilot unit; the at least one assistant circuit is connected with the at least one main circuit and the load; the invention also provides a power supply method of the power supply circuit. The power supply circuit and the power supply method provided by the invention can realize the electrification of a plurality groups of batteries respectively; the current limiting unit is utilized for preventing the batteries from being damaged; the current pilot unit, such as a switching tube, etc. is utilized to ensure the normal power supply of the load; the invention does not rely on extra assistant equipment and manual operation, does not have special requirements for power supply source and the batteries, has no safety hidden danger, is convenient for realizing intelligent automatic control, has simple circuit and low cost and is convenient for promotion and use.

The invention belongs to the low-current grounding fault technical field and relates to a transient power direction-based hand-in-hand line low-current grounding fault processing method. According tothe transient power direction-based hand-in-hand line low-current grounding fault processing method of the invention, a transient power direction and delay combined method is adopted to process the low-current grounding fault of a hand-in-hand line; a fault section can be judged on the basis of transient power directions; and action delay is set for switches; and corresponding switches at the upstream or downstream of the fault section are controlled to trip after set delay time comes. The method does not rely on communication, and does not affect the normal power supply of a valid section atthe upstream of a fault point; and a risk that a valid section line undergoes secondary power failure can be avoided, and fault processing efficiency can be improved.

The invention relates to a rail traction power supply system based on a flywheel energy storage device and a method for increasing power quality thereof. The system comprises a railway switching room, a flywheel energy storage device, a converter and step-down transformers respectively arranged on a phase a and a phase b of a power supply arm, wherein a fuse and a circuit breaker are arranged on the high-pressure side of each step-down transformer; in the whole electric circuit, the flywheel energy storage device is connected with feeding busbars a and b through the converter and the step-down transformers; the step-down transformers and a converter system are used for converting the single-phase alternating current on the feeding busbars into direct current and outputting to the flywheel energy storage device; the flywheel energy storage device is used for executing a control strategy in the manner of collecting the voltage and current of the converter system. According to the invention, complete three-phase voltage balancing and active power regulation can be realized; recycling and reutilization for the regenerative brake energy of the train are realized; the investment of the passing neutral section device is reduced; the running of the power system is more stable and the power quality of the system is increased; the rail traction power supply system is applicable to the common power grid and micro-grid.

The present invention discloses a circuit device for detecting a battery capacity through intermittent pulse discharge. The device comprises a microprocessor, a transistor (Q) and a sense resistor (Rt). One end of the sense resistor is connected with an analog/digital converter port, a positive electrode of a battery and one end of a load, the other end of the sense resistor is connected with a collector electrode of the transistor, a base electrode of the transistor is connected with a control port of the microprocessor, an emitting electrode of the transistor is connected with a negative electrode of the battery and the other end of the load, and the ratio of the resistance of the sense resistor and resistance of the load is 1/5-1/10. During working, the microprocessor provides a transient high-level pulse for the control port at intervals of a pause time slot so as to enable the transistor to be in instantaneous saturation conduction and be cut off, and the width of the pause time slot is a hundred thousand times of that of the high-level pulse. According to the above technical scheme of carrying out real-time operation detection on the remaining battery capacity through an intermittent pulse discharge method, the aims of accurate detection and real-time operation detection of the remaining battery capacity are achieved.

The invention relates to the technical field of electrical engineering, and discloses a static var generator (SVG)-based charged ice melting topology system and an ice melting method thereof, aiming at forming a structure which emits reactive power at one end and absorbs the reactive power at the other end so as to increase the transmission trend of a circuit and achieve the purpose of heating formelting ice; furthermore, the grid voltage is maintained to be unchanged, the electricity use of a user is not affected, and charged ice melting is realized. The charged ice melting topology system comprises an electric transmission line which is in series connection between a first substation bus and a second substation bus; the charged ice melting topology system comprises a first SVG device and a second SVG device, wherein the first SVG device is connected with the first substation bus in series by means of a first switch, and the second SVG device is connected with the second substation bus in series by means of a second switch.

A street light power-saving device relates to the technical field of street light control and is provided with an air switch connected with a power supply; the other end of the air switch is connected with the input end of an auto-transformer and the input end of a by-pass contactor respectively; and the switch output end of the auto-transformer and the output end of the by-pass contactor are connected with a thermal relay respectively. The street light power-saving device can save electricity by 20 percent to 40 percent by controlling the switching time of a street light through the combination of a time control switch or a celestial clock and a main switch, has independent by-pass, a manual or automatic switching function and protective functions for short circuit, overload and the like.

The invention relates to an electricity leakage-prevention and overcurrent protection device. The device comprises a power source input unit A, an output control execution unit Z, an electricity leakage detection unit K and an overcurrent detection unit M which are respectively connected in series with the electricity leakage detection units C1-Cn, the overcurrent detection units D1-Dn and the output control execution units H1-Hn of each branch circuit, wherein the electricity leakage detection units C1-Cn, the overcurrent detection units D1-Dn and the output control execution units H1-Hn of each branch circuit are connected in parallel; a DC power source unit E is respectively connected with an earth detection unit B and a microcontrol unit F; and the microcontrol unit F is respectively connected with the earth detection unit B, the electricity leakage detection units C1-Cn, the overcurrent detection units D1-Dn, the output control execution units H1-Hn, the output control execution unit Z, the electricity leakage detection unit K and the overcurrent detection unit M.

The invention relates to a method for adding a cut-off 10 KV circuit linear pole section switch with load. The method comprises the steps that a bypass live working method is used for insulation shielding on electrified bodies and grounded bodies in the working range; a temporary isolation cross arm is mounted to shift a live wire; middle-phase two-side tension-resistant porcelain bottle strings and a two-side phase tension-resistant cross arm are mounted, a wire tightener is mounted to tighten three-phase wires and check and ensure normal through-flow; middle-phase wires are cut by pincers and fixedly connected with the tension-resistant porcelain bottle strings, a middle-phase wire tightener and a safety rope are dismantled and insulation shielding is completed, the two-side phase tension-resistant cross arm provided with the section switch is mounted below a tension-resistant cross arm, the tension-resistant porcelain bottle strings are mounted and insulation shielding is completed, working on two-side phase wires is performed with a construction method with the middle phase, and then shielding is completed. Three-phase leads of the switch are connected to the three-phase wires, normal through-flow is checked and ensured, and the work is finished. The method doesn't affect normal power supply for the user, power failure time is reduced, the power supply volume is large, and the economic benefit is increased.

The invention discloses a rapid standby power supply switching apparatus which comprises: a CPU unit, a simulation unit, a power supply unit, an input unit, an output unit, a communication unit and a display unit. The CPU unit and the power supply unit are directly communicated with other modules except the display unit. The simulation unit transforms input alternating current signals. The CPU unit is connected with the simulation unit, the display unit, the input unit and the output unit so as to measure and control real-time parameters in an electric power system. The rapid standby power supply switching apparatus has the following characteristics of wide measurement range, high accuracy, good real-time performance, wide applicability range, low costs and the like. And the apparatus is convenient for operation and maintenance.

The invention relates to a rapid, reliable and safe grounding wire fixture. The rapid, reliable and safe grounding wire fixture comprises a fixed fixture (1) and a movable fixture (2), wherein a hook (12) is arranged at an upper part of the fixed fixture (1), a sliding rod (21) is arranged at a lower part of the movable fixture (2) and is arranged in a sliding hole of the fixed fixture, a movable fixture head (22) is arranged at an upper end of the sliding rod, a first press spring (25) is arranged in the sliding hole and sleeves the sliding rod, a connection sleeve (4) is arranged below the fixed fixture (1), a plurality of steel ball holes (41) are formed in a side wall of the connection sleeve, a steel ball (42) is arranged in each steel ball hole, an annular steel ball groove (26) is formed in an outer wall of the sliding rod, a control sleeve (5) is arranged below the fixed fixture, and a second press spring (43) is arranged in the control sleeve and sleeves the connection sleeve (4). By using the rapid, reliable and safe grounding wire fixture, reliable contact between the grounding wire fixture and an overhead wire can be ensured, the grounding wire is convenient and rapid to pick up and hang, the power failure maintenance time is favorably shortened, the operation speed is increased, and normal power supply is not affected.

The invention discloses a low-voltage power supply network electric leakage fault protection method based on zero phase transfer, which is applied to guarantee safety when a low-voltage power supply network breaks down. When earth fault occurs to a line, a power supply is additionally arranged between a zero line and the ground, or a voltage regulator or a transformer is additionally arranged between the zero line and the ground to apply a voltage between the zero line and the ground, so that the fault phase voltage is clamped below a safety voltage, the potential safety hazard of a groundingfault is eliminated, and the long-time uninterrupted safe operation requirement of a low-voltage power supply network is met. According to the invention, a power supply or a voltage regulator or a transformer is used to directly reduce a fault phase voltage below a safety voltage; the safety problem of a line fault can be rapidly solved, the safety risk of personal equipment is reduced, line powersupply is not influenced, normal operation of all loads of a power supply network is ensured, the power supply reliability and safety are greatly improved, meanwhile, the design and construction installation cost is low, and wide market prospects are achieved.

The invention discloses a single-end electrical quantity full-line quick-acting protection method using a choke coil to construct the line boundary, according to the topology of different power supplysystems, the choke coil is installed on the line to construct the line boundary, and then the protection criterion is constructed according to the difference of the electric quantity between the protected line area and the internal and external faults, so as to realize the single-end electric quantity full-line quick-action protection. The invention adopts choke coil to construct the boundary ofthe circuit and realizes the single-end quantity full-line quick-acting protection on the circuit without boundary element, As that method of the invention can effectively overcome the problem of lowsensitivity of the pow frequency protection of the alternating current circuit in the multi-converter, It also meets the requirements of fast operation of protection for DC lines. At the same time, itdoes not need protection coordination when applied to distribution network. Only the electrical quantity of a single end can realize the rapid identification of faults inside and outside the protection zone, and it can effectively solve the relay protection problem of a power grid including multiple converters.

Disclosed is a sliding-type switching device used for main-connection-line short circuit precheck of a low-voltage circuit breaker and the switching device belongs to the field of accessories of low-voltage electric appliances. The low-voltage circuit breaker includes contact systems, a center shaft, a locking device, an operating handle, a base and an arc extinction chamber. The contact systems include dynamic contact mechanisms. The dynamic contact mechanisms include dynamic-contact contact arms. Each sliding-type switching device is characterized by including a precheck contact plate, a pair of sliding contact shoes and a pair of sliding contact plates. Each precheck contact plate is installed at the middle part of one side of a corresponding dynamic-contact contact arm, backing on to a corresponding static contact mechanism. The pair of sliding contact shoes are fixed at the two ends of a corresponding precheck contact plate. Each pair of sliding contact plates are fixed on the base and are in slide cooperation with a corresponding pair of sliding contact shoes. Each sliding contact plate includes a fixing plate. Each fixing plate is provided with insulating layers near the two ends of the upper surface along a slide rail of a corresponding contact shoe and a conductive layer at the middle part. When the sliding contact shoes slide to the conductive layers, the sliding contact shoes are electrically connected with the conductive layers. The sliding-type switching device can be used for detecting short-circuit faults of a load-side main connection line before switch-on of a low-voltage circuit breaker.

The present invention discloses a charging power supply protection device, which comprises a battery pack, an electronic switch matrix unit connected with the battery pack, a central processor connected with the electronic switch matrix unit, and a security management unit connected between the battery pack and the central processor. The battery pack includes a first battery configured to be just in use, and a second battery configured to be charged. The electronic switch matrix unit is respectively connected with each battery of the battery pack. Upon receiving a switching instruction sent from the central processor, the electronic switch matrix unit selects and switches on the output circuit of at least one battery. The security management unit is provided with a power failure protection memory and is used for monitoring the electric quantity of each battery in the battery pack and identifying a charging circuit in the battery pack. The central processor is used for figuring out the abnormal condition of the current environment and then sending a shut-off instruction to the electronic switch matrix unit in the abnormal condition so as to cut off the charging circuit in the battery pack. By adopting the device, the energy consumption can be reduced and the reliability is improved.

The invention relates to a circuit structure applied to stabilize the output of a microgrid energy storage system. The circuit comprises an inductor L, a capacitor C, a resistor R, a photovoltaic panel PV, a supercapacitor (UUC, RUC), a storage battery (Ub, Rb), four diodes (D1, D2, D3, and D4) and four switch tubes (M1, M2, M3, and M4). A circuit is connected in series and works in a microgrid. When an energy storage battery is in a charging state, the switch tubes M2 and M3 cut off, the switch tubes M1 and M4 are conducted, and a photovoltaic power generation system and a power grid charge the energy storage system. When the energy storage battery is in a discharging state, the switch tubes M2 and M3 are conducted, the switch tubes M1 and M4 cut off, and the energy storage system discharges a load. Compared with a previous microgrid energy storage system, by using the circuit structure of the invention, a response speed is fast, a photovoltaic battery output fluctuation caused by anenvironment change can be stabilized, and a bus power sudden change caused by a load change can be restrained.

The invention provides an electric lifting type installation assisting device for a current transformer of a high-voltage switch cabinet, and relates to the technical field of current transformer installation. The electric lifting type installation assisting device comprises a transverse pipe, an electric lifting device and a current transformer hook assembly, hooks are arranged at the two ends ofthe transverse pipe respectively, and hanging holes matched with the hooks are formed in the switch cabinet. The current transformer hook assembly comprises a cross beam, a hanging ring is arranged on the upper portion of the cross beam, a lifting hook is arranged on the lower portion of the cross beam, the upper end of the electric lifting device is connected with the cross pipe through a firstconnecting piece, the lower end of the electric lifting device is connected with the hanging ring through a second connecting piece, and the lifting hook is connected with the current transformer. Theinstallation assisting device is simple in structure, low in cost, easy to install and capable of effectively improving the working efficiency and the construction quality, guaranteeing the operationsafety of construction personnel and guaranteeing that the replacement work of the current transformer is completed as expected when the current transformer of the 10kV-35kV high-voltage switch cabinet is replaced and installed.

The present invention discloses an elevator car emergency power supply. The emergency power supply comprises a housing, an inner shell, and a power control box. The housing is fixedly connected with the inner shell by using first screws; one side of the housing is provided with a terminal, and one surface, near the lower end of the terminal, of the housing is provided with cooling openings; and the inner shell is fixed to the power control box by using second screws, and a socket panel is mounted on the surface of the inner shell. According to the elevator car emergency power supply disclosed by the present invention, the elevator car emergency power supply does not affect the normal power supply of mains supply; when interruption of mains supply occurs, the emergency AC power supply of 220V, 200W, and 50Hz can be output to the elevator car; and the emergency power supply is small in size and light in weight, can be directly installed inside the elevator control cabinet or the car top, and is very convenient to use.

The embodiment of the invention provides an alternating current and direct current power supply and system. The power supply comprises: an alternating current and direct current conversion device with a first direct current confluence busbar; a direct-current switch array comprising a plurality of direct-current switches and a plurality of first fuses corresponding to the direct-current switches, wherein the direct-current switches are all connected to the first direct-current confluence busbar, and each first fuse is correspondingly connected to the corresponding direct-current switch; a plurality of DC/DC converters corresponding to the plurality of first fuses, wherein each DC/DC converter is connected to one of the first fuses; and a second DC confluence busbar, wherein the output ends of the plurality of DC/DC converters are connected in parallel and then are connected to the second DC confluence busbar. According to the invention, when the DC/DC converters break down, normal power supply to the load is not affected, or when the load changes, is overhauled or is stopped, the DC/DC converters can be disconnected or restarted on line.

The invention provides a miniature circuit breaker level relative inserting wire inletting structure which comprises a miniature circuit breaker and busbars. Half of the one end of the miniature circuit breaker is provided with a plurality of rectangular teeth which correspond to the busbars, a plug-in busbar conductive clamping head of the wire inletting end of the miniature circuit breaker is arranged in a groove which is formed between a certain pair of rectangular teeth; one ends of the pairs of rectangular teeth of the miniature circuit breaker are connected at the two sides of the busbars in a relative and inserted mode, each plug-in busbar conductive clamping head of the miniature circuit breaker is connected to one busbar in a clamped mode, and the rectangular teeth at the half of a miniature circuit breaker is matched with the rectangular teeth at the half of another miniature circuit breaker in relatively inserted mode. Terminal distribution boxes produced through the connection mode of the circuit breaker can be precast and produced according to the standard series, and a box body, a guide rail, a wire inletting busbar and a zero busbar can be preset and integrated. Users only needs to design the loop number and switch capacity according to demands of the users and insert the switches into the system in sequence, and the final assembly is completed, dismantling and maintenance are greatly facilitated, and standard, high efficiency and low cost can be achieved.