Showing papers on "Contactor published in 2014"

Power storage device

Abstract: PROBLEM TO BE SOLVED: To provide a power storage device capable of easily handling changes in load voltageSOLUTION: A constant-closed type contactor 3 of one power storage device A1 is connected to a constant-open type contactor 2 of the other power storage device A2 so that storage batteries 1 of the power storage devices A1 and A2 are connected to each other in series When a load (not shown) is connected to a connector 6 of the other power storage device A2, the two power storage devices A1 and A2 are connected to each other in series to form a closed circuit with respect to the load, and the power is supplied to the load from the power storage devices A1 and A2 Thus, even when the rated voltage of the load is increased two times, the power is satisfactorily provided from the power storage devices A1 and A2

Membrane Gas-Solvent Contactor Pilot Plant Trials of CO2 Absorption from Flue Gas

Abstract: Membrane gas-solvent contactors have received much attention for CO2 absorption, as the approach incorporates advantages from both solvent absorption and membrane gas separation. This study reports on pilot plant trials of three membrane contactors for the separation of CO2 from flue gas. The contactors were porous polypropylene (PP), porous polytetrafluoroethylene (PTFE), and non-porous polydimethylsiloxane (PDMS), with the solvent PuraTreatTM FTM. To enable performance comparison, laboratory measurements based on a gas mixture of 10% CO2 in N2 were also undertaken on the same contactor–solvent systems. It was found that the PP contactor experienced significant pore wetting in both laboratory and pilot plant studies. In contrast, the PTFE contactor experienced only minor pore wetting in the laboratory. However, in the pilot plant trial of the PTFE contactor extensive pore wetting was observed, and the overall mass transfer coefficient measured was comparable with the PP contactor. The non-porous PDMS con...

Contactor-based haptic feedback generation

Abstract: A system that generates haptic effects senses contact on an interface by a contactor/object. The system then determines one or more properties of the contactor and generates a type of haptic effect in response to the contact. The type of haptic effect is based at least on the one or more properties.

Capacitor precharging and capacitance/resistance measurement in electric vehicle drive system

Abstract: An electric drive system for an electric vehicle has a DC power source and a contactor with an output coupled to a main bus and an input adapted to be connected to the DC power source. The contactor is selectably switched between an open state and a closed state. A link capacitor is coupled to the main bus. A precharge circuit is coupled between the DC power source and the link capacitor comprised of a controlled current source. The controlled current source is selectably activated with the contactor in the open state to charge the link capacitor to a predetermined voltage to before switching the contactor to the closed state.

Current–voltage characteristics of a cathodic plasma contactor with discharge chamber for application in electrodynamic tether propulsion

Abstract: This paper focuses on the net electron-emission current as a function of bias voltage of a plasma source that is being used as the cathodic element in a bare electrodynamic tether system. An analysis is made that enables an understanding of the basic issues determining the current?voltage (C?V) behaviour. This is important for the efficiency of the electrodynamic tether and for low impedance performance without relying on the properties of space plasma for varying orbital altitudes, inclinations, day?night cycles or the position of the plasma contactor relative to the wake of the spacecraft. The cathodic plasma contactor considered has a cylindrical discharge chamber (10?cm in diameter and ?11?cm in length) and is driven by a hollow cathode. Experiments and a 1D spherical model are both used to study the contactor's C?V curves. The experiments demonstrate how the cathodic contactor would emit electrons into space for anode voltages in the range of 25?40?V, discharge currents in the range of 1?2.5?A, and low xenon gas flows of 2?4?sccm. Plasma properties are measured and compared with (3?A) and without net electron emission. A study of the dependence of relevant parameters found that the C?V behaviour strongly depends on electron temperature, initial ion energy and ion emission current at the contactor exit. However, it depended only weakly on ambient plasma density. The error in the developed model compared with the experimental C?V curves is within 5% at low electron-emission currents (0?2?A). The external ionization processes and high ion production rate caused by the discharge chamber, which dominate the C?V behaviour at electron-emission currents over 2?A, are further highlighted and discussed.

CO2 Absorption in Polytetrafluoroethylene Membrane Microstructured Contactor Using Aqueous Solutions of Amines

Abstract: Absorption of carbon dioxide (CO2) in aqueous solutions of monoethanolamine (MEA) and diethanolamine (DEA) was performed in a flat membrane microstructured contactor. The contactor had dimensions 192 mm × 97 mm (length × width). Liquid and gas flowed in channels of 0.2 mm and 0.85 mm depth, respectively, separated by a supported polytetrafluoroethylene (PTFE) membrane of 20 μm thickness containing 0.5–5 μm openings. The function of the membrane was to bring into direct contact the two phases (gas and liquid) without dispersing one phase into the other. Experiments were conducted with 1.6 M MEA and 1.6 M DEA solutions and 20 vol% CO2/N2 inlet concentration, with a fixed inlet molar ratio CO2/amine of 0.5 at room temperature. Substantial CO2 absorption was observed for gas residence time below 0.2 s. A mathematical model with no adjustable parameters was used to simulate the contactor, and experimental results were compared to model predictions in terms of CO2 removal efficiency. The model showed satisfacto...

Heat sink for contactor in power distribution assembly

Abstract: An electrical contactor assembly is provided including an electrical bus bar and at least one electrical contactor. The electrical bus bar includes a layer of insulation, a layer of copper, and a composite core having at least one wire embedded therein. The wire is configured to locally reduce thermal strain. The at least one electrical contactor is mounted to the layer of copper through an opening in the layer of insulation. The electrical contactor and the bus bar are thermally and electrically connected.

Electric energy accumulation system based on accumulator batteries and supercapacitor with network enhancement function

Abstract: FIELD: electricity.SUBSTANCE: invention relates to converting equipment and purposed for manufacturing of electric energy accumulation system operated in the network. The device contains accumulator batteries, fuses, bidirectional inverters, inverter control system, system for accumulation system control, contactor switch of accumulation system, contactor switch of AC network, AC network, self-sustained load, bank of supercapacitors, bidirectional inverter of supercapacitors, supercapacitors precharge module, bidirectional inverter of DC network, contactor switch of DC network, DC network, network quality control module, control system for active restoration of network quality, thyristor switch of balancing capacitors, bank of balancing capacitors.EFFECT: improving quality of the network voltage, compensation of network distortions and distortions introduced by self-sustained load connected to the accumulator, uninterrupted power supply for the load.1 dwg

Numerical Simulation and Analysis of CO2 Removal in a Polypropylene Hollow Fiber Membrane Contactor

Abstract: This present study shows a comprehensive 2D numerical model for removal of CO2 in a polypropylene (PP) hollow fiber membrane contactor (HFMC) using the computational fluid dynamics (CFD) method. Monoethanolamine (MEA) solution was used as the liquid absorbent in a nonwetting mode. The simulation results represented that higher liquid velocity and concentration and lower gas velocity and concentration led to higher percent of CO2 removal. The most proper parameters for CO2 removal were less than 1 mol m−3 gas concentration and 0.2 m s−1 gas flow rate, and for MEA the values were above 8 mol m−3 concentration and approximately 1 m s−1 liquid velocity. Furthermore, the model was validated with the experiment results. Therefore, the modeling results provided references to the selection of absorbents and operation parameters in the experimental study and pilot-scale applications.

Intelligent series compensation device for distribution network and use method of compensation device

Abstract: The invention develops an intelligent series compensation device for a distribution network and a use method of the compensation device. The device has the effects of improving the distribution of voltage along a power distribution line, reducing voltage drop and improving the transmission capacity of the line and has the characteristics of load-self-adaptive voltage regulation and real-time response. In order to achieve the effects, the intelligent series compensation device for the distribution network comprises a capacitor group, a silicon controlled rectifier, a controller, an integrated reactor/resistor, a circuit breaker, a contactor, an isolating switch and a sensor. Due to the adoption of the technical scheme, when a system normally works, the voltage which is compensated by series capacitors can automatically respond to the variation of load current in real time without any extra control; when a failure occurs in the system, the warning, the short-time bypass and the protection of the device can be realized through the operation of the controller on a switch.

Charging interface protection circuit and charger

Abstract: The utility model discloses a charging interface protection circuit and a charger having the protection circuit The charger comprises a control module, a connection confirmation port connected to the control module, and an alternating-current contactor for switching on or switching off the charger circuit The protection circuit further comprises a temperature detection module which is arranged in the charging interface and used for performing temperature detection on the charging interface One end of the temperature detection module is grounded, and the other end of the temperature detection module is connected with the connection confirmation port When the charging interface temperature is greater than a preset value, a signal is sent by the temperature detection module to the control module, and the control module will be used to cause the alternating-current contactor to switch off the charger circuit so as to stop the charging operation of the charger on an electrical vehicle According to the utility model, the disadvantage of excessive charging interface temperature caused by excessive contact resistance in the charging process of the charger on the electrical vehicle can be avoided, so the damage on a charging plug and a charging socket due to high temperatures can be effectively avoided

Electrical Characterization of Test Sockets With Novel Contactors

Abstract: Novel spring contactors were designed and characterized for wafer-level interposer and high-speed package test system applications, especially for wafer-level packages. These contactors can be used as replacement for vertical wafer probes as well as test sockets used in the final test. The contactor pin consists of a plunger section made of beryllium copper and a plated helical stainless steel spring wire. It is 5 mm in uncompressed total length, including the plunger and the spring. The overall diameter of the spring wire section was 0.51 mm. The design of the contactor is much simpler and more scalable than that of traditional spring pins called Pogo pins used in package tests. A test socket containing 36 contactor pins was constructed for tests and measurements. The experimental characterization shows -1-dB bandwidth of 3.73 GHz for 0.8-mm pitch, measured by the direct contact method. This experimental result correlates well with the simulated results. The rise time was 82 ps as measured by TDR, and the propagation delay was 23 ps. The electrical conduction path is through the pin and the spring, making it a reliable contact. However, the electrical path is known to be through the barrel, not the spring for the regular spring pins.

Starting control method for hybrid electric vehicle

Abstract: The invention provides a starting control method for a hybrid electric vehicle. The method comprises the following steps: after a key switch of the hybrid electric vehicle is turned to an ON gear from an OFF gear, a plurality of controllers in the hybrid electric vehicle performs self-inspection; after the self-inspection of a battery management system is normal, the battery management system controls a negative pole main contactor to close, and a vehicle management system controls a DC power converter to operate; after the key switch is turned to a START gear from the ON gear, the vehicle management system sends a power-on instruction to the battery management system after judging that the hybrid electric vehicle meets a high-voltage power-on condition, and the battery management system orderly closes a precharging contactor and a positive pole main contactor; and after the high-voltage powering on of the hybrid electric vehicle is completed, the vehicle management system sends a control instruction to a micro control unit, and the micro control unit controls a motor to start. The starting control method disclosed by the invention can realize the control of the whole starting procedure of the hybrid electric vehicle, and overcome the defects of a conventional control method, so that the safe starting of the vehicle can be realized. The control method is simple and reliable.

Battery management system of micro-electric vehicle

Abstract: The invention is applicable to the technical field of management of batteries of electric vehicles and provides a battery management system of a micro-electric vehicle. The battery management system comprises a battery charger, a power battery pack and a motor driver. A first contactor is arranged between the battery charger and the power battery pack. A second contactor is arranged between the power battery pack and the motor driver. The battery management system further comprises an acquisition unit, a control unit and a communication unit. The control unit is used for estimating the remaining capacity and the health condition of the power battery pack according to obtained voltages, currents, internal resistance and temperature and controlling switch-off of the corresponding contactor when charging and discharging faults happen. Except main CAN communication, the battery management system further includes auxiliary Zigbee communication; the service life of the power battery pack can be prolonged by monitoring the currents, the voltages, the internal resistance, the temperature, the remaining capacity and the health condition of the power battery pack; the reliability and diversity of communication of the whole micro-electric vehicle can be improved through reasonable application of the auxiliary Zigbee communication.

Design of an Automatic Water Level Controller Using Mercury Float Switch

Abstract: This paper presents the design of an automatic water level controller aimed at providing an appropriate control to pump water to an overhead thank when empty and automatically stop the pump when the tank is full. The system incorporates two mains contactor which are energized to provide a direct online start of the motor. An over load relay which senses the presence of excess current and disconnect the supply and a mercury flood switch which uses the Archimedes principle of floatation to provide the electrical contact to switch ON or OFF supply to the motor when the tank is empty or full respectively. This is capable of providing a seamless utilization of water at domestic and industrial level without causing spillage.

Dehumidification system for air conditioning

Abstract: An air temperature and humidity control device is provided including a heat pump and a humidity controller. The heat pump has a condenser, a first evaporator, a compressor, and a second evaporator. The humidity controller includes a first contactor fluidly coupled to the second evaporator. The first contactor includes at least one contact module having a porous sidewall that defines an internal space through which a liquid desiccant flows. A liquid source is coupled to the first contactor such that a second liquid provided by the liquid source flows through the first contactor adjacent an external side of the porous sidewall. Heat and/or water vapor transfers between the second liquid and the liquid desiccant.

Integrated membrane dehumidification system

Abstract: An air temperature and humidity control device is provided including a first heat pump having a compressor, an expansion valve, a condenser, and an evaporator. The first heat pump has a refrigerant circulating there through. A humidity controller includes a first contactor fluidly coupled to the evaporator and condenser. The first contact includes at least one contact module having a porous sidewall that defines an internal space through which a hygroscopic material flows. A first air flow is in communication with the porous sidewall of the first contactor. The device also has a second heat pump including a first polishing coil. The first polishing coil is substantially aligned with and arranged generally downstream from the first contactor relative to the first air flow.

Withdrawable contactor trucks with integral motorized levering-in, related switchgear, kits and methods

Abstract: Withdrawable contactor trucks for a circuit breaker have a cradle with a motorized drive system comprising an electric motor in the cradle. The motorized drive system is configured to move the contactor truck in a controlled path between a withdrawn position and a levering-in position in a switchgear compartment.

System and method for managing timing sequences of high-low voltage power-on and power-off of plug-in hybrid electric vehicles

Abstract: The invention relates to a system and a method for managing timing sequences of high-low voltage power-on and power-off of plug-in hybrid electric vehicles. The system comprises a vehicle control unit VCU, a flat-motor controller ISU, a drive-motor controller TMU, a low-voltage power-on switch KL.15, a high-voltage power-on switch KL.50, a compressor controller ACP, a direct-current converter DCDC, an electric-oil-pump controller EOP, a positive main contactor PMC, a negative main contactor NMC, a pre-charge contactor PCC and a battery management unit BCU. High-low voltage power-on and power-off control strategies of a vehicle power system are completely realized by the VCU. The system and the method have the advantage that both personal safety and operation safety of electric loads can be guaranteed before or after high-voltage power-on and power-off of a vehicle, and power system failure caused by power-on and power-off timing sequence disorder is avoided.

Elevator brake control system and control method

Abstract: The invention discloses an elevator brake control system and a control method. According to the scheme, a power supply regulation circuit is adopted to regulate input PN voltage into direct current voltage required by elevator brake control through closed-loop control, and current change required by elevator brake control can be controlled according to demands; meanwhile, a switch circuit is matched with the power supply regulation circuit, and the switching of current regulated through the power supply regulation circuit is controlled, so that a brake power supply is shut off. The brake control scheme replaces the traditional brake power supply and brake contactor, reduces the cost, eliminates the noise produced during the operation of the contactor, improves the reliability of circuits, reduces the quantity of maintenance points, can control the operation process of a brake through current control, reduces the noise produced during the operation of the brake, and cancels continuous current circuits at two terminals of a brake coil.

Method and system for detecting vehicle high-voltage system

Abstract: The invention provides a method and system for detecting a vehicle high-voltage system The high-voltage system comprises a power battery, a shunt, a positive electrode contactor, a negative electrode contactor, a precharging module, a positive electrode bus and a negative electrode bus The method comprises the steps that the positive electrode contactor and the negative electrode contactor are controlled to be powered off and be attracted to a precharging contactor; a current of the shunt and a bus voltage between the positive electrode bus and the negative electrode bus are detected; according to the current of the shunt and the bus voltage, whether the negative electrode contactor breaks down or not is judged According to the method for detecting the vehicle high-voltage system, the contact state of the conductors can be accurately and rapidly detected and the safety of the high-voltage system is improved The invention further provides the system for detecting the vehicle high-voltage system

Experimental study on arc behaviors of a bridge-type contact when opening a resistive load in the range of from 280VDC to 730 VDC

Abstract: Supply voltage of the dc power system in an electrical vehicle or an airplane keeps increasing with the increment of their electric energy consumptions, which raises a claim on high voltage contactors or relays. Special design on contact system or arc chamber in the contactor for arc quenching is necessary to meet the requirement of dc high voltage break. In this paper, arc behaviors when a bridge-type contact opens a dc resistive load are studied by analyzing arc shapes and waveforms of arc voltage and current. The power voltage varies from 280 V to 730 V, the current is kept to be 50 A, the material of contact is copper and the arcing gas is air. A cuboid permanent magnet is used to provide adjustable magnetic field for accelerating the arc quenching. Key arc parameters, such as arc durations, arc lengths, arc re-ignitions and the period that the arc stays on contact surface, are obtained as the power voltage increases from 280 V to 730 V and the magnetic field varies from 30 mT to 90 mT. The results are of practical value for designing the contact system of a high voltage dc contactor.

Electric vehicle charging system

Abstract: A charging system of an electric vehicle includes a drive battery storing electric power for driving a motor of the electric vehicle, a heater heating the drive battery, an electric power supply device converting electric power supplied from outside the electric vehicle and supplying the electric power to the drive battery or the heater, a contactor activating or deactivating a connection between the drive battery and the electric power supply device, temperature detector detecting a temperature of the drive battery, and controller controlling the contactor and the heater based on the temperature. The controller controls the contactor so as to deactivate the connection and conducts electricity to the heater when the temperature is less than a first predetermined temperature, and controls the contactor so as to activate the connection when the temperature is the first predetermined temperature or greater.

Auxiliary power supply system for motor train unit and fault load reducing method

Abstract: The invention relates to an auxiliary power supply system for a motor train unit and a power supply method and a load reducing method of the auxiliary power supply system. The auxiliary power supply system for the motor train unit comprises auxiliary current transformers, a bus I, a bus II, bus connectors, a contactor box, medium-voltage loads and a low-voltage power supply system. The bus I and the bus II penetrate through the whole auxiliary motor train unit through the bus connectors on the two sides of carriages. The auxiliary current transformers and the medium-voltage loads are connected with the bus I or the bus II alternately according to the parity number of the motor train unit carriages. Part of the medium-voltage loads of the motor train unit operate in a load reducing mode or are directly disconnected when the auxiliary current transformers break down. The auxiliary power supply system operates in a parallel connection mode through the buses penetrating through the whole auxiliary motor train unit, the relative concentration and flexible arrangement eliminating mode of the motor train unit is achieved, the requirement for the redundancy of each set of auxiliary current exchanging system is low, the economic cost is greatly reduced, the power supply of the whole train unit is stable and reliable, and the passenger comfort level and the running safety coefficient of the motor train unit are guaranteed.