3352 results about "Distribution transformer" patented technology

A system, method and computer program product provides for power line communications (PLC) over electric power lines includes a device mountable near an electrical distribution transformer (DT) to provide a high speed interface and communicates with one or multiple access devices, which provide low speed interfaces for analog signals or digital signals over RS 232, RS 485, optical, wireless and Ethernet. The device transmits data to / from these access devices over the electric lines to other repeaters over one or more wires of an electrical line or over multiple lines, and serves to strengthen and improve signal quality. Upon detecting a wire or line is having problems carrying data, the data is sent over other wires, and upon power line failures, wireless backup to mobile / GSM and WiMax networks is utilized. The device permits utilities and others to read electric meters, monitor the power quality of the distribution grid and detect power losses / failures / outages, and permits telecom service providers and others to provide a communications link to cell phone towers, WiFi Access Points and enable broadband Internet and telephony in rural, remote or sparely populated areas.

A broadband access transmission network integrating the functions of electric power network, communication network, TV network and Internet relates to network transmission. It includes a broadband transmission network of 10 KV power distribution network and a broadband transmission network of low-voltage power distribution network. These two transmission networks are connected via distribution transformers and optical fiber connectors. The broadband transmission network of 10 KV power distribution network is composed of optical compound power lines, wires, transformer substations, machine rooms, taps, insulating jackets, insulating waterproofing outer jackets and optical fiber connectors. The broadband transmission network of low-voltage power distribution network is composed of optical compound power lines, coaxial cable compound power lines, taps, insulating jackets, optical access points, distributors, modems and two-way amplifiers. The invention can perform high-speed broadband communication and power transmission on the same compound wires. It utilizes the existing power network sufficiently and prevents the cost of rebuilding the communication network, cable TV network and Internet, and can simultaneously perform building, operating, maintaining and managing of these networks.

A power converter system advantageously employs a modular, bi-directionally symmetrical power converter assembly in a readily customizable configuration to interconnect a direct current power source to a three-phase alternating power grid. Connections external to the power converter assembly are selected to optimize the power converter system for a specific application, such as interconnecting a photovoltaic array to the three-phase electrical power grid. The electrical interconnections of various elements including isolation transformers, voltage sensors, and control switches are optimized to improve efficiency and reliability.

The invention relates to a modular charging / discharging system of a power battery pack of a multifunctional electromobile, which aims to provide a system which can effectively meet the requirement for the bi-directional power transmission of a charging station and can exert the functions of peak clipping and valley filling as well as peak modulation and frequency modulation of a power grid. The technical scheme is as follows: the modular charging / discharging system of the power battery pack of the multifunctional electromobile comprises a charging-station monitoring system and an information management system, wherein the charging-station monitoring system is composed of a computer and a network communication system. The modular charging / discharging system is characterized by also comprising a three-phase step-down transformer, wherein the high voltage side of the three-phase step-down transformer is connected with a power grid, and the low voltage side of the three-phase step-down transformer is connected in parallel with a plurality of charging / discharging branches; each branch comprises a three-phase distribution transformer and a charging / discharging module, and the three-phase distribution transformer is connected in series with the charging / discharging module; and each charging / discharging module comprises a pulse-width modulation alternating current / direct current (PWM AC / DC) converter with the function of bi-directional power transmission, a plurality of electromagnetic isolation type DC / DC transform modules with the function of bi-directional power transmission and the information management system, and the electromagnetic isolation type DC / DC transform modules are connected in parallel.

An AC-to-DC power converter configured to provide power factor correction and a single isolated low-voltage output. The power converter includes a single-stage resonant power converter including an isolation transformer, a resonant tank, a rectifier, and a bulk storage capacitor coupled to an output of the isolation transformer. In typical applications, at least one non-isolated power converter is coupled to the output of the single-stage isolated power factor correction converter.

Data signals are communicated between a power line and a computer, wherein the power line provides power to the computer via a distribution transformer and the computer is in communication with a wireless communication path. A first data signal is communicated with the power line. A conversion is made between the first data signal and a second data signal capable of being communicated wirelessly. The second data signal is wirelessly communicated with the wireless communication path.

A system, device, and method of detecting an overload condition of a distribution transformer that supplies power to one or more customer premises via a low voltage subnet is provided. In one embodiment, the method comprises determining the power output of the transformer; storing in a memory a threshold power value for the transformer; determining whether the power output exceeds the threshold power value; and, if the output power exceeds the threshold power value, providing a notification. Providing the notification may include wirelessly transmitting the notification and / or transmitting the notification over a medium voltage power line. The low voltage subnet may comprise a low voltage feeder that supplies power to a plurality of low voltage supply lines that extend to the customer premises in which case determining the output power may comprise measuring a voltage of the low voltage feeder and measuring a current traversing the low voltage feeder. The method may also comprise storing in the memory a plurality of threshold power values associated with a plurality of transformers, such as different models of transformers; receiving data of the power output of a multitude of transformers; and determining whether the power output of each of the multitude of transformers exceeds the threshold value associated with the transformer, which steps may be performed at a central computer system such as a power line server.

The invention discloses a method for locating fault of power distribution system with ineffectively grounded neutral point based on transient traveling wave, which can acquire required traveling wave signals and relatively higher detection reliability by arranging equipment only on both sides of circuit. According to the actual site condition, a non-contact electromagnetic field sensor is arranged in a transformer substation to acquire transient voltage and current traveling wave, a power distribution transformer arranged on the tail end of the circuit transmits voltage-variable traveling wave to solve the problem in acquisition of tail-end voltage traveling wave signals, and the type of the fault of the circuit can be rapidly recognized according to the amplitude and the polarity characteristics of a fault traveling wave recorded by the secondary side of the transformer. The invention provides a new fault search algorithm based on the midpoint of time to solve the problem of noncontinuous wave speed of aerial wire and cable. Accordingly, the proposal can achieve the assembly and the operation of the equipment without adding extra primary equipment of the system and powering off the circuit, thus saving the cost and reducing the complex degree of the project. Practical operation shows that the method can locate a fault within a range of plus or minus 100 m.

There is disclosed a method of detecting the configuration of a network having a feeder line with a plurality of feeder meters and distribution transformer meters (DTMs) coupled thereto and with one or more customer meters and / or customer configuration modules coupled to the distribution transformers. The method includes the steps of having each of the feeder meters transmit a uniquely identifiable signal through the feeder line. The DTMs then identifying the phase of each of the uniquely identifiable signals and then transmitting the phase of each of the uniquely identifiable signals to a data collector along with a unique DTM identifier. The connectivity relationship between the feeder meters and distribution transformer meters is then extrapolated by comparing the phase information transmitted by the DTMs. The relationship of the customer meters relative to the DTMs can also be plotted by having each DTM transmit the DTM identifier to all of their respective customer meters, who then transmit this to the data collector along with their customer meter identifier. The method also permits the determination of which phase the DTM is connected to by analyzing the phase angle of a demodulated feeder meter signal.

The present invention provides a system and method for operating a power line communications system for communicating via an underground residential distribution power system. One embodiment of the present invention includes an aggregation point, which may be co-located with a point of presence, communicatively coupled to one or distribution points. The distribution points are communicatively coupled to one or more medium voltage interface devices. The medium voltage interface devices are communicatively coupled to one or more power line bridges via URD medium voltage power lines. The power line bridges may be co-located with a URD distribution transformer and provide communications to the user devices communicatively coupled to the LV power lines of the distribution transformer.

A method and system provide for the cooperative charging of electric vehicles. By using power line communications, chargers of the electric vehicles who are serviced by the same distribution transformer can form self-contained local area networks due to the nature of power line communications (PLCs). Alternatively, or in addition to the PLCs, other communication networks, such as the Internet and local area networks, may be used as part of the communications infrastructure for the chargers. After the chargers of the electric vehicles are coupled to one another through power line communications or traditional communications networks, they can form a logical token ring network. According to this token ring network, a predetermined number of tokens can be assigned within the token ring network for permitting chargers with tokens to charge respective electric vehicles while chargers without tokens must wait until they receive a token to initiate charging.

The invention discloses a power grid power supply guarantee and intelligent management and control system based on ubiquitous power Internet of things, wherein, the system comprises a data acquisitioncomponent which is used for acquiring various power grid data of a plurality of different devices of a power grid, wherein the data acquisition component comprises various sensors and the like whichare arranged on the power grid and used for acquiring the power grid data; a data analysis component is used for carrying out statistical analysis on the collected power grid data through the intelligent distribution transformer terminal to obtain an analysis result; and a decision control component is used for controlling the power grid through the deep learning network according to the analysisresult. The power grid power supply guarantee and intelligent management and control system based on ubiquitous power Internet of things solves the technical problems that a plurality of sets of electric systems in the related technology cannot share, the acquired data is less, and real-time feedback cannot be realized.

An apparatus and method for equitably allocating bandwidth to virtual networks operating on a common physical network, such as a power-line network for homeowners sharing a single power-line distribution transformer. An ad-hoc master is selected from the virtual power-line network controllers. The master allocates bandwidth to streams based on their priority group categorization. By way of example, four priority groups (A-D) are described into which stream priority is classified, with the highest priority group for communicating isochronous streams, the lowest priority for transferring asynchronous streams and the other priority groups for communicating streams having an intermediate level of transmission priority. Within a given priority group all bandwidth requests are fulfilled for virtual networks requesting up to their fair share of the bandwidth within the priority group, and bandwidth available from virtual networks not utilizing their full share is allocated equally amongst those requesting more bandwidth.

The invention provides a distribution network automatic system based on broadband wireless communication and a realization method thereof. The distribution network automatic system comprises a distribution transformer data collecting and monitoring device, a broadband wireless communication network and a monitoring center, wherein the distribution transformer data collecting and monitoring device is arranged in a transformer site for collecting and processing electric power parameters, transmitting data to the monitoring center by the broadband wireless communication network so as to responds to a control command sent by the monitoring center. In the realization method, the distribution transformer data collecting and monitoring device is connected with the monitoring center by the wireless communication network, a protocol in coincidence with electric power 101 protocol for the data transmission is set; and the distribution transform data collecting and monitoring device collects and processes the existing distribution transform parameters of the distribution transformer and responds to the control command from the monitoring center. The invention adopts a modular system architecture design, has upward and downward compatibility, and can realize various wireless broadband module communication services; in addition, the design of stipulations of an agreement of the monitoring center is based on the electric power 101 protocol and is compatible with protocols realizing different versions.

An apparatus and method for equitably allocating bandwidth to virtual networks operating on a common physical network, such as a power-line network for homeowners sharing a single power-line distribution transformer. An ad-hoc master is selected from the virtual power-line network controllers. The master allocates bandwidth to streams based on their priority group categorization. By way of example, four priority groups (A-D) are described into which stream priority is classified, with the highest priority group for communicating isochronous streams, the lowest priority for transferring asynchronous streams and the other priority groups for communicating streams having an intermediate level of transmission priority. Within a given priority group all bandwidth requests are fulfilled for virtual networks requesting up to their fair share of the bandwidth within the priority group, and bandwidth available from virtual networks not utilizing their full share is allocated equally amongst those requesting more bandwidth.

The invention discloses a coordination charging control method for an electric vehicle charging station, which belongs to the technical field of charging control of the electric vehicle charging station. The coordination charging control method is characterized in that: aiming at the maximization of running economic benefits of the charging station, the on / off of each charging station is controlled according to charging need information input by a user, the information of vehicle batteries of electric vehicles and the load information of a power system under the constraint conditions of no distribution transformer overload and the charging needs of the user, thereby realizing coordination charging control over all the electric vehicles in the charging station.

The invention relates to the field of electric power and communication, which discloses a method of data acquisition from a data acquisition terminal, and the method comprises the following steps: a concentrator collects resident electricity data through low-pressure carrier waves; a net meter collects distribution transformer electricity data through alternating collection; the concentrator is connected with the net meter through a serial port, and the net meter is connected with a front end processor through a communication module and used for sending electricity data; a collection server isused for sending collection demand data to a collection terminal through the front end processor and receiving the collection terminal data transmitted by the front end processor asynchronously, if collection fails, enter supplement collection, and if not, skip to the next step; a center server is used for analyzing and processing the data. The invention simultaneously discloses a system of dataacquisition from a data acquisition terminal. The invention has the beneficial effects of high capability of permitting simultaneous access of a large number of distribution transformers and residentsand ensuring the real-time performance and integrity of resident electricity data and distribution transformer electricity data by an optimized communication method and a perfect supplement collection strategy.

The invention provides an electric vehicle charge-discharge optimized dispatching method based on virtual electricity price. The method comprises the following steps: an electric energy public service platform predicts and samples the basic daily load information of a target area within an optimization time interval; when a new EV is connected to a charging pile within the target area, the network connection information of the new EV is read; a user input the charging information of the vehicle; an EV charge-discharge power model is constructed; virtual electricity price is calculated to indirectly reflect the load level of the target area; a dispatching model with the charge-discharge power as an optimization variable is constructed; dynamic time-of-use electricity price for user cost calculation is determined by combining wavelet analysis preprocessing and fuzzy clustering methods; the user makes an automatic response decision; a charge-discharge operation is performed on the EV according to the decision of the user and a plan is uploaded. The electric vehicle charge-discharge optimized dispatching method based on virtual electricity price is capable of realizing peak clipping and valley filling of EV cluster load and reducing the charge-discharge cost of the user on the basis of meeting the charging requirement of the user and the capacity limitation of a power distribution transformer. In case of a great EV cluster scale, the electric vehicle charge-discharge optimized dispatching method based on virtual electricity price is still capable of meeting grid side expectations.

The invention provides an urban rail train regenerative brake energy absorbing and using system. The system comprises an energy feedback inverter, an energy-storing unit, a DC / DC (direct-current / direct-current) bidirectional converter and a direct-current flat-wave capacitor, wherein the direct-current side of the energy feedback inverter and the high-voltage side of the DC / DC bidirectional converter are connected in parallel with the direct-current flat-wave capacitor and are simultaneously connected in parallel with the anode and the cathode of a direct-current bus; the low-voltage side of the DC / DC bidirectional converter is connected with the energy-storing unit; and the alternating-current side of the energy feedback inverter is connected with the low-voltage side of a distribution transformer in a traction substation, and the energy feedback inverter is used for inverting regenerative brake energy on the direct-current bus to be used by electric equipment in the traction substation. The invention also provides a regenerative brake energy absorbing and using method based on the system. The energy feedback inverter and the DC / DC bidirectional converter are coordinated and controlled on the basis of the change status of the voltage of the direct-current bus, the train regenerative brake energy is quickly and fully absorbed, the voltage of the direct-current bus is kept stable, and the utilization rate of the train regenerative brake energy is improved.

The present invention relates to a system for controlling, measuring and monitoring the secondary electric power distribution grid with remote fraud and power theft detection, readings, power cuts-off, reconnection and client load control, besides continuous monitoring of the electric grid parameters, providing diagnostics on the status of the grid and public lighting from an assigned Command Central, located at the secondary bulbar of the distribution transformer, and Measuring Modules at clients installations.

A method and system provide for the cooperative charging of electric vehicles. By using power line communications, chargers of the electric vehicles who are serviced by the same distribution transformer can form self-contained local area networks due to the nature of power line communications. After the chargers of the electric vehicles are coupled to one another through power line communications, they can form a token ring network. According to this token ring network, a predetermined number of tokens can be assigned within the token ring network for permitting chargers with tokens to charge respective electric vehicles while chargers without tokens must wait until they receive a token to initiate charging.

A dry-type, resin-encapsulated transformer coil that includes multiple layers formed from a length of conductive material, and multiple cooling ducts that are formed of thermoplastic material and spaced between the layers of conductive material. The thermoplastic material forming the cooling ducts and the resin that encapsulates the multiple layers of conductive material are thermally and electrically compatible.

A system for spread spectrum power line communications employs a harmonic modulation (HM) transmitter coupled to the power line for transmitting message bits to an HM receiver. The spread spectrum accommodates a plurality of HM transmitters simultaneously occupying the same bandwidth. The spectrum of HM, in a frequency range above 60 Hz but below the maximum frequency that will carry through a distribution transformer, is ideal in combating carrier synchronous noise since it can be interleaved with the noise harmonics and therefore be effectively spectrally disjoint with the synchronous noise process spectrum.

A device and method for providing power line communications via an underground residential distribution power system is provided. One embodiment of the present invention includes a power line bridge having though section and processing section. The through section may include a first and second amplifying circuit for amplifying data signals traveling in opposite directions. The processing section may include a first, a second modem, and a controller that may process commands and perform routing functions. The power line bridge may be co-located with a URD distribution transformer and provide communications to the user devices communicatively coupled to the LV power lines of the distribution transformer.

Electrical current in an electrical power distribution system, such as at a power distribution transformer or the like, for an electrical utility is transferred through a current sensing connector lug mounted with an end of a user or consumer's service connection conductor or line. The lug is connectable to the power distribution transformer or secondary conductor, for connecting the user's service conductor to power from the distribution system. The flow of electrical current and thus the amount of electric power provided to an individual user is measured at the current sensing lug rather than at the user's site or facility, removing the need for watt-hour meters at the user or customer site, and also thus removing the requirement for conventional meter reading crews or for automated meter reading equipment. The current sensing lug also facilitates the accumulation of other utility data information, which formerly required a site visit by utility personnel.

A hybrid transformer is provided that includes an electromagnetic transformer and an AC-AC converter with a DC bridge. The AC-AC converter is operable to keep the input voltage and current of the hybrid transformer substantially in phase and to reduce fluctuation in the output voltage of the hybrid transformer in the event of an increase or decrease in the input voltage.