The invention provides a phasor obtaining method based on line and phase voltages, and provides technical support for three-phase voltage and current phase sequence decomposition and analysis on three-phase imbalance. negative-sequence and zero-sequence components cause three-phase imbalance, the sequence components are obtained by phasor phase sequence decomposition, and an instrument tends to measure the magnitudes of line and phase voltages and is hard to obtain the phasors. The characteristic that the three-phase line voltage form a unique triangle is used, the shape of the line voltage triangle is determined by using the voltage magnitude, one line voltage serves as the reference, and the phasors of the other two line voltages are determined. On such basis, the characteristic that three vortexes of the line voltage triangle represents end points of the phase voltage is used, an intermediate point of the phase voltage is determined via least squares according to magnitude of the three-phase phase voltage and a phase voltage measuring error, the end points and the intermediate point are connected, a phasor of the three-phase phase voltage is obtained, and technical support is provided for subsequent phase sequence decomposition and analysis on the three-phase imbalance.

Phasor obtaining method based on line and phase voltages

The invention discloses a nose pad for glasses and a production method thereof. The reason why jade has never been applied to a nose pad for glasses even with the mild property is that overall weight of glasses can be too large when an inlaying technique is adopted, while the texture of jade can be changed by the adoption of bonding glue. According to the technical scheme, a support blade is composed of a jade layer and a silica gel layer, one side of the silica gel layer is combined with the jade layer, and a nose pad arm connecting protrusion is arranged on the other side of the silica gel layer; a circle of lining is arranged on the edge of the silica gel layer. In this way, the intact support blade made of jade and silica gel is obtained, no binding material is used, and no side effect can be caused to the body; furthermore, the mild property of jade can be realized, dry eyes and dizziness can not be caused after long-term use, and a user feels cool and comfortable when wearing glasses in summer.

Nose pad for glasses and production method thereof

The invention discloses a multifunctional integrated ion meter device which comprises an ion meter main machine, a display screen, a multifunctional electrode stand, an electromagnetic stirring zone, a keyboard zone, a rotating speed regulation knob, an electrode holder and an infrared thermometry module, wherein the display screen is arranged on the ion meter main machine, the multifunctional electrode stand is arranged on one side of the ion meter main machine, a chuck of the electrode holder is arranged on the multifunctional electrode stand, the infrared thermometry module is arranged in the middle of the chuck of the electrode holder, and the keyboard zone and the rotating speed regulation knob are arranged on the ion meter main machine. Compared with the prior art, the multifunctional integrated ion meter device can measure the concentration of a sample solution, and perform temperature measurement and temperature compensation on the solution in a non-contact infrared thermometry manner at the same time. The ion meter can be conveniently used for evenly stirring the sample solution, use steps in the measurement are simplified, and the ion meter is used conveniently and has popularization and application values.

Multifunctional integrated ion meter

The invention provides a PH measuring apparatus capable of continuously measuring a PH value. The PH measuring apparatus comprises a utensil placing rack, a controller and a printing circuit board, wherein the utensil placing rack is composed of a lower bottom plate and an upper fixing plate; a detecting cup is arranged between the lower bottom plate and the upper fixing plate; the outer surface at the rear end of the controller is provided with a bottom rod; the bottom rod is connected with a connecting rod I through a joint I; the connecting rod I is connected with a connecting rod II through a joint II; the connecting rod II is connected with a connecting rod III through a joint III; the bottom end of the connecting rod III is connected with a circular fixing plate; and a measuring electrode and a reference electrode are fixedly arranged on the circular fixing plate. Compared with the prior art, the PH measuring apparatus has the following beneficial effects that: PH values of a plurality of solutions can be quickly measured and are displayed through a display screen, so that a worker can intuitively and clearly know the PH value information through the display screen, and therefore, the use is convenient, the operation is convenient, the working efficiency is high, a great deal of labor resources are saved, the stability is good and the reliability is high.

PH measuring apparatus capable of continuously measuring PH value

A power generating device includes a carrier module, a stator module, a rotor module and a power generating module. The stator module is assembled to the carrier module, and has a first circuit board and a plurality of driving coils. The rotor module is located in an electromagnetic field, and has a multipolar magnetic rotor and a rotating axle. A magnetic field of the multipolar magnetic rotor interacts with the electromagnetic field to make the rotor module rotating relative to the stator module, and make the multipolar magnetic rotor producing a varying magnetic field. The power generating module is located in the varying magnetic field, and has a second circuit board and a plurality of induction coils. The induction coils induct the varying magnetic field to output an induction circuit to the second circuit board.

Power generating device

The utility model discloses an acidimeter is used in teaching, include host computer, display screen, dab switch and arc -spark stand, the display screen with dab the switch and establish on the host computer, it is equipped with threely to dab the switch, the display screen with dab the switch respectively with host computer electric connection, it is provided with buffer solution pH value form to dab the switch top, the display screen below is provided with location regulator, slope regulator and temperature compensating regulator, location regulator, slope regulator and temperature compensating regulator respectively with host computer electric connection, the electrode sets up in host computer one side, be provided with temperature electrode and pH electrode on the arc -spark stand, temperature electrode and pH electrode one end are provided with the electrode socket, and this acidimeter is used in teaching measurement accuracy is high, measure the temperature and pH value simultaneously, and convenient operation is reliable.

Acidimeter is used in teaching

Improved structure of an industrial fan tripod

The invention discloses a three-phase transformer phase testing method comprising the following steps of: connecting the primary terminal A to the secondary terminal a of a test sample and inputting three-phase power to test 4 voltages including UAB, Uab, UBb, and UBc, computing the angle Bab by using a cosine law, and acquiring a phase number by a lookup program in combination with a relation between the UBb and the UBc. Compared with a conventional double voltage method, the method greatly reduces the number of measuring parameters and the number of computing times, increases testing efficiency, and may obtain the transformer group number by one time of trigonometric function operation.

Three-phase transformer phase testing method

The utility model discloses a nose of metal spectacle -frame holds in palm component, including the nose of silica gel material hold in the palm, nose bracket and with the thin pole of the metal of nose seated connection on the metal picture frame, its characterized in that: if the nose asks the upper surface that contacts with the bridge of the nose to inlay and does the health function piece, form continuous smooth curved surface between the surface of health function piece and the upper surface that the nose held in the palm, pass through spring coupling between thin pole of metal and the nose bracket. The utility model discloses have health function, improve the comfort level that glasses were worn simultaneously.

Nose of metal spectacle -frame holds in palm component

The invention relates to a transformer operation control system, in particular to an internet-based transformer operation monitoring system. A transformer end of the internet-based transformer operation monitoring system comprises an input voltage sensor and an input current sensor which are connected with an input line, as well as an output voltage sensor and an output current sensor which are connected with an output line, wherein the input voltage sensor, the input current sensor, the output voltage sensor and the output current sensor are connected with a controller, the controller is connected with a power supply, a temperature sensor, a GPS module, an attitude sensor and a network access module; and a control end comprises a server, and a data display module and an alarm module which are connected with the server. The internet-based transformer operation monitoring system monitors operation load condition, temperature information, position information and attitude information of a transformer through the sensors, and can further monitor operation parameters, attitude variation occurred by man-made causes or affected by extreme weather as well as actual geological position of the transformer, thereby achieving the purpose of being convenient in centralized control and maintenance.

Internet-based transformer operation monitoring system

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