34results about "Induction meters" patented technology

In a method for detecting an inverter hardware failure in an electric power train comprising high voltage cables, at least one electric machine and at least two inverter legs with two power electronic switches respectively for pulse-width-modulating a DC voltage from a high voltage battery for energizing the at least one electric machine, and including at least one mid-pack voltage sensor for detecting isolation faults, wherein all power electronic switches are demanded to open; at least one of the power electronic switches of one of the inverter legs is opened and closed at a time at a given duty cycle and a given frequency; a mid-pack voltage is measured using the mid-pack voltage sensor; the closed switch is identified as functional in case a common mode voltage is detected by the mid-pack voltage sensor or otherwise the closed switch is identified as non-functional.

The invention relates to a single-phase static electric energy meter and a circuit controlling method, wherein, the electric energy meter comprises a metering unit, a recording unit, a communication unit, a monitoring unit, a self-checking unit, a displaying unit and a time sharing unit. The metering unit adopts single-phase three-wire, meters maximum demand, and has high current and a wide metering range; the recording unit is used for recording electric energy, the maximum demand, demand generation time, recording a load curve, and recording events such as programming, timing, demand clearing and time zone switching; the communication unit is used for carrier communication on an automatic networking power line, and provides the optical port communication conforming to ANSI specification; the monitoring unit is used for detecting the voltage, the current, the active power, the apparent power and the frequency of an electric network and detecting undervoltage, excess voltage, current loss and over-current; the self-checking unit is used for checking time sharing setting errors, and metering the errors, etc.; the displaying unit is used for normally performing liquid crystal display at the low temperature of subzero 40 DEG C; and the time sharing unit is used for meeting the multiple rate time share of the ANSI standard. The invention provides the single-phase static electric energy meter which is provided with more complete functions and more suitable for the use requirements of multiple levels of users.

A measuring circuit arrangement (1) for an electricity meter for direct connection is respectively connected, for each phase of a three-phase network, to an input (3) for voltage detection and to an input (4) of a measuring chip (2) for detection of the electric current. A voltage divider (R1,R2) used for voltage level adaptation is provided upstream from the input (3) for voltage detection. A current transformer (5) with a series connected measuring shunt (R?SH#191) is installed upstream from the input (4) for current detection. The current transformer (5) is embodied in such a way that the ohmic resistance to the measuring shunt (R?SH#191) sufficiently limits standard direct-current impingement of the current transformer (5) and said ohmic resistance is small enough so that, together with the inductance of the current transformer (5), it only exhibits a standard angle error.

The invention relates to a household induction meter which allows a working household power wire to be inserted into in a detachable mode so as to calculate a degree number of power consumption. The household induction meter comprises a current detection device, a calculating unit and a display unit, wherein the current detection device allows the working household power wire to be inserted into; the calculating unit is used for receiving a current signal detected by the current detection device to calculate the power consumption; the display unit is used for displaying power consumption, which is calculated by the calculating unit. By the construction of the household induction meter, a domestic consumer can conveniently detect power consumption in a room. The household induction meter is convenient and practical. Moreover, the household induction meter is formed by a plurality of independent subcomponents and is convenient to assemble and disassemble. Therefore, due to the adoption of the household induction meter disclosed by the invention, LED (light-emitting diode) suspension or wall-mounted display, the transceiving of wireless communication data, display of a universal meter or display of a digital photo frame and the like can be directly carried out. When an LED is used and a temperature, a humidity and time can be displayed, a household wall-mounted LED clock with the temperature and humanity display functions and a function of an ammeter is formed. When the universal meter is used for displaying, the universal meter with the household induction meter is formed.

A structure for measuring iron loss of a motor stator core is provided. The structure includes an auxiliary core whose both end surfaces in a longitudinal direction come in contact with inner end surfaces of two adjacent stator teeth among a plurality of stator teeth in a radial direction in order to measure iron loss of a stator core in which a plurality of slots and the plurality of stator teeth are alternately formed on an inner circumferential surface of a stator yoke in a circumferential direction. A pair of excitation windings is provided at portions of the auxiliary core in the longitudinal direction spaced-apart from each other. A B-coil that is a sensor coil is provided at the auxiliary core so as to be positioned inside any one excitation winding of the pair of excitation windings. Fixing protrusions protrude from the both end surfaces of the auxiliary core to extend in the longitudinal direction, and inserted into the slot between the two adjacent stator teeth to be fitted and fixed in the circumferential direction. Accordingly, it is possible to quantitatively and accurately measure iron loss of the motor stator core for each manufacturing process.

The invention relates to a measuring transducer for charging stations of electric vehicles. In the measuring transducer, a measuring device is connected to a direct current charging circuit for detecting at least one direct current measurement variable. A transducer for converting the direct current measurement variable into an alternating current actuating variable is provided, and the measuring transducer also includes an actuating means for adjusting at least one alternating current variable in an alternating current measuring circuit as a function of the alternating current actuating variable.

The invention discloses a metering and protecting system and method for an intelligent miniature circuit breaker. The metering and protecting system comprises a protection circuit and a metering circuit for the miniature circuit breaker. The protection circuit is used for collecting and integrating data to control the miniature circuit breaker to connect or disconnect a power supply connected withthe miniature circuit breaker. The metering circuit is used for metering voltage, current, frequency, power and electric energy data of a line where the miniature circuit breaker is located. The costof purchasing a large number of electric energy meters by a user is effectively reduced. More safe guarantee is provided, more convenient service is provided, the electric energy metering and billingfunction can be achieved, the electric quantity can be limited, automatic outage of the limited electric quantity is achieved, automatic point sending after money charging is achieved, overvoltage, undervoltage and power limiting protection functions with settable thresholds are provided, fire disasters are prevented, automatic wave recording can be achieved, and the functions of analyzing faultreasons of an electric power system can be achieved.

The invention relates to the technical field of electric energy meters, in particular to an induction type electric energy meter which comprises an induction type electric energy meter body, wherein a mounting plate is arranged on the surface of the induction type electric energy meter body, an embedding groove is formed in the surface of the induction type electric energy meter body, a connecting rod is arranged on the surface of the embedding groove, the other end of the connecting rod is fixed to the surface of a blocking piece, a spring sleeves the outer side of the connecting rod, a mounting frame is arranged on the surface of the induction type electric energy meter body, a cross rod is arranged on the surface of the mounting frame, and a torsional spring sleeves the outer side of the cross rod. The induction type electric energy meter has the beneficial effects that swing type baffles are additionally arranged in front of the induction type electric energy meter, the baffles are dragged by a traction rope body to rotate around the cross rod, torsional springs are additionally arranged between the cross rod and the through holes to facilitate reset of the baffles, and when the two baffles are perpendicularly placed, a glass plate on the surface of the induction type electric energy meter is protected.

The present invention relates to the visual representation of an input value, and provides an instrument, which can be given any predefined characteristic of its visual display. Cross-coil instrument is provided, said cross-coil instrument comprising a driver for the instrument characterized in that it further comprises a digital input terminal, a predetermined characteristic of the instrument stored as a map of input/output values in a digital memory and a microprocessor, said input value being a value represented visually by the cross-coil instrument, said output value being the value applied to the cross-coil instrument to visual represent the input value.

The invention belongs to the electric power measuring technology and particularly relates to an induction type electric energy meter of which a rated maximum current Imax is eight times as large as a basic current Ib. The induction type electric energy meter comprises driving elements and rotation elements, wherein the rotation elements comprise a rotation shaft, a rotation disc and a lower shaft tip, the rotation disc and the rotation shaft are in movable connection, a lower portion of the rotation disc is provided with an upper magnetic ring, the upper magnetic ring and the rotation shaft are in movable connection, a top portion of the lower shaft tip is provided with a lower magnetic ring, the lower magnetic ring and the lower shaft tip are in fixed connection, the driving elements comprise a voltage element, a current element and a magnetic shunt, and the magnetic shunt is arranged between the voltage element and the current element. Performance of an integral machine formed through the induction type electric energy meter satisfies single-phase and three-phase electric energy meter requirements in related long-life technology electric energy meter standards in domestic and industries, and a flat straight curve can be acquired within a 5%Ib-800%Ib broad loadscope.

The invention is suitable for the electrical technology field and provides a transient surge electric energy detection device and a manufacturing and mounting method thereof. The device includes an electromagnetic induction module, an acquisition module, an integral module and an analog to digital conversion module, wherein the acquisition module is used for collecting the induced electromotive force generated by the electromagnetic induction module and the generation time information of the induced electromotive force, the integral module is used for performing integral of the collected information to obtain an integral value of the simulated induced electromotive force and sending the integral value to the analog to digital conversion module, the analog-to-digital conversion module can output the digital induced electromotive force integral value, so the transient surge electric energy passing through a surge protection device is calculated by an intelligent monitoring system according to the digital induced electromotive force integral value. The device is advantaged in that the device is simple and practical, the transient surge electric energy passing through the urge protection device can be effectively and accurately calculated, effective data is provided for replacement or maintenance of the surge protection device, and safety of electrical equipment can be further guaranteed.

The invention discloses a three-phase electricity meter provided with anti-misoperation mechanism. The three-phase electricity meter comprises a shell and an electricity meter body, wherein the electricity meter body is located in an inner cavity of the shell, two sides of the electricity meter body are each provided with two installation mechanisms, the left side of the electricity meter body is provided with a knife switch, the knife switch is fixedly connected to a rear wall of the inner cavity of the shell, and the top of the knife switch is electrically connected with two first wires. According to the three-phase electricity meter, through the up-down movement of the movable plate, when the connection part of the second electric wire and the third electric wire of the ammeter body needs to be maintained, the movable plate shields the positions of the second electric wire and the third electric wire; when the electric meter body is overhauled, an operator only needs to pull an operation handle of the knife switch downwards to perform power-off operation, and then the movable plate is driven to move downwards, so the position for connecting the second electric wire and the third electric wire is displayed, the electric meter body is overhauled, safety of the overhauling operation is guaranteed, and misoperation of the operator during the overhauling operation is avoided.

A phase group estimation device (10) according to the present invention is provided with a data acquisition unit (11) for acquiring data transmitted from smart meters, a storage unit (15) for storingequipment information indicating the correspondence between smart meters and pole transformers corresponding to the smart meters, and a phase group estimation unit (13) for grouping, on the basis of the equipment information and data, each processing section corresponding to a pole transformer into a phase group to which power is supplied from distribution lines of the same phase.