42 results about "Current Leakage Testing" patented technology

A method of detecting faults in a traction motor installation having a plurality of AC traction motors powered from a common power source, each of the traction motors being connected by associated motor cables to a cable junction and the common power source being connected to the cable junction by main cables, includes disconnecting the power source from the main cables and performing initial short circuit to ground, short circuit between phases and leakage to ground tests on the traction motors through the main cables. When a fault is detected by the initial tests, at least one detailed test is performed by applying a predetermined voltage to the main cables and sensing current flow in the motor cables connected to each of the motors. The detailed test is one of a detail short circuit to ground test, a detail short circuit phase to phase test, and a detail leakage to ground test.

The invention discloses an insulativity detection device for cable maintenance, relates to the technical field of insulativity detection, and solves the problems that the operation is too tired when an erected cable is detected at present, and the wire take-up and pay-off are very inconvenient when the wire take-up and pay-off are detected. The insulativity detection device comprises a vehicle body; a supporting plate is fixedly arranged at the top of the vehicle body; four first supporting rods are installed among the four sets of side supporting plates at the top in a sliding mode. Five second supporting rods are fixedly connected to the right sides between the five sets of side supporting plates in a welded mode. The outer sides of the four first supporting rods and the outer sides of the five second supporting rods are each rotationally provided with two rotating wheels. An electric leakage tester is further fixedly mounted on the right side of the top of the supporting plate. Thedevice is supported by the shear fork mechanism during detection, a detector does not need to hold the device by hand all the time, the fatigue degree of workers is greatly reduced, more labor is saved during detection, manual operation is not needed during winding of a wire, the wire can be automatically pulled into the vehicle body, and the winding convenience is greatly improved.

In one embodiment, a universal current leakage measurement device is disclosed. A universal current leakage testing adapter has the ability to couple with at least two differently sized or shaped probe connectors. The universal current leakage testing adapter is configured to couple with differently sized or shaped probe connectors by conductive planes either functioning independently or in concert to contact the pins of a probe connector.

The invention relates to a judgment method of composite insulator aging degree. The judgment method comprises the following steps: S1, performing hydrophobic performance testing, current leakage testing and tension testing on a to-be-tested composite insulator; S2, determining a comprehensive aging factor of the to-be-tested composite insulator according to a hydrophobic performance testing result, a current leakage testing result and a tension testing result of the to-be-tested composite insulator; and S3, determining the aging degree of the to-be-tested composite insulator according to the comprehensive aging factor. The judgment method has the following advantages: 1) the hydrophobic performance testing, the current leakage testing and the tension testing are combined to commonly detectthe aging degree of the composite insulator, and the aging state of the composite insulator can be well reflected in compared with the hydrophobic performance testing, the current leakage testing andthe tension testing, and the accuracy is high; and 2) compared with the judgment method of a scanning electron microscope and the infrared spectroscopy, the judgment method disclosed by the inventionis simpler and more convenient, and the cost is low.

The invention provides a circuit breaker test device. The device comprises a handle, a handle spring, a test button spring, a test button, a connecting conductor, a test resistor, a first test contactand a second test contact, wherein the handle spring is at least provided with a movable end, the movable end of the handle spring rotates along with the handle, the test button spring is electrically connected with a handle spring, the movable end of the handle spring abuts against a first test contact after the handle spring is switched on along with rotation of the handle, and the movable endof the handle spring is disconnected from the first test contact after switching off or tripping, so an electric leakage test loop is in a disconnected state. The device is advantaged in that the handle spring is electrically connected with the test button spring, the movable end of the handle spring moves along with the handle, and thereby contact and separation of the handle spring and the firsttest contact are achieved, the structure of a test loop is achieved under the condition that the same purpose can be achieved, the number of parts is reduced, and the cost is saved.

The invention relates to a circuit, in particular to a residual current protection testing circuit in a device with residual current protection. The residual current protection testing circuit is characterized in that the residual current protection testing circuit comprises a testing button S1, an operational amplifier U1, a Wien bridge circuit, an output circuit and a current transformer CT, and the Wien bridge circuit comprises a resistor R7, a resistor R8, a capacitor C2 and a capacitor C3. By adopting the scheme, the novel residual current protection testing circuit provided by the invention has the advantages that the problems existing in the prior art are overcome; since a sine wave oscillating circuit is used for simulating output current leakage testing signals, the circuit reliability is high and the circuit is not influenced by open phase and under-voltage of a three-phase power supply; and since a low-voltage power supply is used for supplying power, the power consumption is low, and the problems that heat is produced and power resistors are apt to damage due to a reason that a high-power resistor is used for decreasing voltage are avoided.

A circuit breaker comprises a shell, and a circuit breaker phase electrode and an electric leakage protection electrode which are arranged on two sides of the shell side by side. The circuit breaker is characterized in that the electric leakage protection electrode comprises a zero sequence current transformer, an electric leakage operation mechanism, an electric leakage test mechanism, a neutralpole static contact and a neutral pole moving contact which are oppositely arranged in the shell; the circuit breaker phase pole comprises a phase pole operating mechanism, a static contact and a moving contact which are oppositely arranged, wherein the moving contact is connected with the phase pole operating mechanism; the main loop of the phase pole of the circuit breaker passes through the zero sequence current transformer; the test mechanism forms a test loop with double breakpoints through two contacts of a first contact part and a second contact part on the elastic part; moreover, the first contact part is driven by the neutral line driving part connected with the neutral pole moving contact to be contacted with the first contact part, and the neutral line driving part is connectedwith the phase pole operating mechanism or the electric leakage operating mechanism, so the test button can be pressed down to disconnect the test loop when the phase pole of the circuit breaker is switched off, and the reliability of the circuit breaker is improved.

The invention provides a tantalum capacitor measuring device, which comprises a track and a tooling plate suitable for moving along the track under the driving action of a moving mechanism, and a plurality of tantalum capacitors are arranged in the tooling plate. The device further comprises a measuring mechanism, the measuring mechanism at least comprises a surge test station, an electric leakage test station and a three-parameter test station which synchronously move, and the test stations are correspondingly arranged along the movement path of the tooling plate. The tooling plate is driven by the moving mechanism to move to the measuring mechanism along the track, the probes at the test stations are respectively in contact with the tantalum capacitors, and surge, electric leakage and three-parameter tests are respectively carried out at the surge test station, the electric leakage test station and the three-parameter test station. According to the technical scheme, a plurality of performances of the tantalum capacitors can be respectively tested at the same time, and the measurement work efficiency is high.

The invention relates to the technical field of electric leakage testing, and particularly discloses a leakage current testing device which comprises a box body, an electric leakage tester and a box cover, wherein the box body is hollow, and the electric leakage tester is installed in the box body; a socket and a wiring terminal are arranged on the outer side of the box body, the socket and the wiring terminal are electrically connected with the electric leakage tester, and a display panel and an adjusting knob are arranged on the electric leakage tester; the box cover is matched with an innergroove of the box body, a positioning hole is formed in the side face of the box cover, a fixing hole is correspondingly formed in the box body, and the fixing hole and the positioning hole are connected through a pin. Heat dissipation holes are formed in the side surface of the box body; a handle is arranged above the box cover; the leakage current testing device provided by the invention can perform electric leakage detection on the equipment, the equipment is directly connected with the wiring terminal, and a power supply is connected through the socket; in the using process, operation isconvenient, safety and reliability are achieved, performance is good, and maintenance is convenient.

A terminal supporting leakage detection and a detection method for performing leakage detection for the terminal is provided, the terminal may include: a first conductive unit, a second conductive unit, a first access end, and a second access end, wherein the first access end is configured to be connected to a ground line of a main board of the terminal through the first conductive unit and used to access a ground line of an external leakage detection apparatus, and the second access end is configured to be connected inside the terminal to a metal portion of a outer casing of the terminal through the second conductive unit and used to access a leakage test line of the leakage detection apparatus.

The invention provides a silicon carbide power semiconductor device testing method. The method comprises the following steps: acquiring grid screening reference voltage; testing to obtain a first rated threshold voltage of each silicon carbide power semiconductor device to be tested; the to-be-tested device grid voltage of each to-be-tested silicon carbide power semiconductor device is tested; when the grid voltage of the to-be-tested device is greater than or equal to the grid screening reference voltage, judging preliminary qualification; testing to obtain a preliminarily qualified second rated threshold voltage of each silicon carbide power semiconductor device to be tested; and when the difference amplitude between the first rated threshold voltage and the second rated threshold voltage is greater than a preset change rate threshold, determining that the silicon carbide power semiconductor device is unqualified, otherwise, determining that the silicon carbide power semiconductor device to be detected is qualified. According to the technical scheme, screening is carried out through the grid leakage current test, the threshold voltage test, the grid voltage comparison and the threshold voltage comparison, damaged chips in the grid leakage current test can be effectively screened out, the screening efficiency is ensured, and the screening precision is improved.

The invention belongs to the technical field of circuit physical parameter detection. The invention discloses a control system based on circuit physical parameter detection. The control system based on circuit physical parameter detection comprises: a current detection module, a voltage detection module, a resistance detection module, a central control module, a power calculation module, an electric leakage test module, a circuit fault diagnosis module, an alarm module and a display module. According to the invention, the electric leakage test module is used for measuring the current of a second signal pin in signal pins of a to-be-tested element and judging whether the to-be-tested element has leakage current or not according to the current, so that the test accuracy is high; meanwhile, the circuit fault diagnosis module utilizes a projection mode to project defect points on a circuit board, so that maintenance personnel can conveniently position and maintain defects of the circuit board, the system is suitable for products of various sizes and models, and the technical problem that in the prior art, the circuit fault detection result display effect is not visual, and consequentlythe maintenance process of the maintenance personnel is complex is solved.

The invention discloses an automatic testing and winding all-in-one machine. The machine comprises a controller and a machine table, wherein the machine table is provided with a double-station testing mechanism, a wire conveying mechanism and a winding mechanism which are connected with the controller, the double-station testing mechanism is used for conducting a conduction test and an electric leakage test on wires, and the winding mechanism is used for arranging and packaging wires which are tested to be qualified; the wire conveying mechanism is used for conveying the wire from the double-station testing mechanism to the wire winding mechanism; the wire conveying mechanism comprises a wire pulling and conveying mechanism, a wire arranging mechanism and a wire taking hand mechanism, the wire pulling and conveying mechanism is used for conveying qualified wires on the double-station testing mechanism to the wire arranging mechanism, and the wire arranging mechanism is used for arranging the wires conveyed by the wire pulling and conveying mechanism in order; the wire taking hand mechanism is used for conveying the wires which are arranged in order on the wire arranging mechanism to the wire winding mechanism. According to the device, integrated operation of wire testing and winding storage is achieved, one device achieves two functions, the automation level of the device is improved, and a large amount of labor cost is saved.

The invention provides an electric leakage test structure and an electric leakage test method. the electric leakage test structure comprises a substrate, and a first well region and a second well region are formed in the substrate; and the electric leakage test structure further comprises a first shallow trench isolation structure formed between the second well region and the first well region, a first source and drain region formed in the first well region, a plurality of second source and drain regions formed in the second well region and a test grid electrode formed on the substrate. In the electric leakage test method, the design sizes of the plurality of electric leakage test structures are different, and each electric leakage test structure is tested, so that the leakage current in each electric leakage test structure can be obtained; and the corresponding relation between the design size and the leakage current in the electric leakage test structure is obtained according to the leakage current in each electric leakage test structure, so that the problems of parasitic electric leakage and the like caused by the internal design of the semiconductor device can be reflected.

The invention discloses a discrete device testing method. The discrete device testing method comprises the following steps: step 1, contact testing; step 2, carrying out a first gate-source electric leakage test; step 3, pressure testing; 4, testing a threshold value; step 5, other test items; and step 6, carrying out a second gate-source electric leakage test. According to the invention, a stable and reliable DC parameter result can be well obtained, the test is convenient, and the test precision and the chip quality are improved.

The invention relates to the field of numerical control machine tool research and development, in particular to an anti-creeping testing device for numerical control machine tool research and development. A water tank is arranged at the right end of a second electric telescopic mechanism, a third electric telescopic mechanism is arranged at the lower end of the water tank, and a driving mechanismis arranged at the lower end of the third electric telescopic mechanism. The driving mechanism comprises a first mounting base, a mounting groove is formed in the first mounting base, a second motor is arranged on the outer side of the first mounting base, a second mounting base is connected to the interior of the mounting groove through a first rotating shaft, the output end of the second motor is connected with the first rotating shaft, and a third motor is arranged in the second mounting base; and a second rotating shaft is arranged at the output end of the third motor, a rotating seat is arranged at the outer end of the second rotating shaft, and an electric leakage test main body is arranged in the right side of the rotating seat. The structure can achieve the omnibearing anti-electric leakage test of the machine tool, the comprehensiveness and accuracy of the test are improved, and the practicability is high.

The invention relates to the field of power equipment, in particular to an intelligent earth leakage protection switch. The switch comprises an earth leakage protection switch body, an instruction receiving module, a test triggering module and a judgment indication module. The instruction receiving module receives a test instruction periodically sent by the superior controller, and controls the test trigger module to trigger an electric leakage test function after receiving the test instruction; and when the judgment indication module does not detect the leakage protection action, the alarm prompt information is sent. In the invention, the control equipment at the upper level can send out or generate a signal which can be identified by the electric leakage protection switch and can be uniquely identified, and when the electric leakage protection switch identifies the signal, the electric leakage protection test function is executed, so the normal function of the electric leakage protection switch can be ensured. According to the invention, the leakage protection function of the leakage protection switch can be periodically and automatically tested.

The invention discloses a circuit breaker electric leakage test method, which comprises the following steps: obtaining an initial switch state of a circuit breaker, and sending an operation notification to a user according to the initial switch state; receiving an operation instruction input by the user, and adjusting the circuit breaker to be in a closing state according to the operation instruction; performing an electric leakage test on the circuit breaker, and judging whether the current switch state of the circuit breaker is an opening state; if the current switch state of the circuit breaker is an opening state, judging whether the current switch state is the same as the initial switch state; and if the current switch state is different from the initial switch state, adjusting the circuit breaker to be in the initial switch state, and sending an electric leakage test success signal to the user. According to the invention, the success rate of the electric leakage test can be effectively improved, and the adverse effect of the electric leakage test is also effectively reduced. The invention also provides a circuit breaker electric leakage test device, computer equipment and a storage medium.

A leakage testing method for a DRAM having a recess gate is provided. The method includes the steps of: programming to set the first storage unit and the second storage unit of a same memory cell with different storage statuses; and disturbing one of the word lines extending through the memory cells; then determining whether the DRAM is acceptable or not. When another one of the word lines extending through the memory cells is caused with a reading error by disturbing the one of the word lines extending through the memory cells, a failure is determined as occurred, and the failure is attributed to a leakage type of extended depletion region. When the another one of the word lines extending through the memory cells is not caused with a reading error by disturbing the one of the word lines extending through the memory cells, the DRAM is determined as acceptable.

The invention provides a discharging method of a capacity fall-off tester. In the discharging method, mechanical discharging is adopted after electronic discharging, momentary large voltage and large current are not generated at the initial discharging stage, so that the arcing phenomena of mechanical dithering, large voltage and large current are avoided. The invention also provides a device forthe method. The device comprises a discharging selection switch, an electronic discharging circuit, a mechanical discharging circuit, a voltage comparator and a tested capacitor controlled by a microprocessor, wherein two ends of the tested capacitor are connected to the electronic discharging circuit and the mechanical discharging circuit. By adopting the device, the results such as machine halt, resetting and the like caused by the disturbance of various instruments on a digital control system during capacitor discharging can be avoided.

The invention discloses a direct-current charging pile testing device which comprises a damping mechanism, a clamping mechanism and an electric leakage testing mechanism. The damping mechanism comprises a shell, a lifting mechanism is arranged at the front side of the shell, and a moving mechanism is arranged at the bottom side of the shell; a supporting mechanism is arranged at the rear side of the shell, a first damping rubber is arranged at the bottom side in the shell, a testing machine is placed on the first damping rubber, and a sealing cover is hinged to the upper surface of the shell;second damping rubber is arranged at the bottom side in the sealing cover and is located on the upper surface of the testing machine, and a clamping mechanism is arranged at the front side of the shell and the front side of the sealing cover; and the clamping mechanism comprises eight first fixing sleeves. The direct-current charging pile testing device can carry out electric leakage testing on adirect-current charging pile, electric shock is avoided, dangers to workers are prevented; moreover, the testing device can be conveniently carried and damped, damage to the testing device is prevented, and the direct-current charging pile testing device can be conveniently used by a user.

The invention discloses an electric leakage test method of a Nand type flash memory. The Nand type flash memory comprises a storage unit and a sense amplifier, the first end of a high-voltage tube ofthe sense amplifier is electrically connected with the first end of a pre-charging capacitor, the second end of the high-voltage tube and the first end of the storage unit are electrically connected with a bit line, the second end of the pre-charging capacitor is grounded, and the second end of the storage unit is electrically connected with a source line. The electric leakage test method of the Nand type flash memory comprises the following steps: in an erasure verification stage of the Nand type flash memory, comparing a stable voltage of a first end of a high-voltage tube with a reference voltage; and judging whether the high-voltage tube leaks electricity according to the comparison result. According to the invention, the electric leakage test of the high-voltage tube is carried out through the multiplexing erasure verification process, so that the voltage difference loaded at the two ends of the high-voltage tube is relatively large, the electric leakage condition of the high-voltage tube in the sense amplifier can be effectively detected, and the reliability of the Nand type flash memory is improved.

The invention discloses a photovoltaic module wet electric leakage test device, which comprises an electrolytic cell used for containing an electrolyte, and a heating device whose input port and output port are respectively communicated with the electrolytic cell The heating device communicated with the electrolytic cell is arranged to heat the electrolyte in the electrolytic cell, the device canautomatically heat the electrolyte in the electrolytic cell, and normal operation of the photovoltaic module wet electric leakage test equipment in a low-temperature environment is guaranteed.

The invention relates to a manufacturing process of an ultra-miniature semiconductor cooler, which comprises the following steps: crystal grain preparation: cutting a crystal bar into a wafer, electroplating the wafer, cutting the electroplated wafer, cleaning the crystal grain, and coating the crystal grain with a UV (ultraviolet) film to obtain standby crystal grains; printing the hot-side ceramic plate, fixing the standby crystal grains on the hot-side ceramic plate, printing the cold-side ceramic plate, carrying out die assembly welding on the hot-side ceramic plate with the fixed crystal grains and the printed cold-side ceramic plate, and carrying out resistance and infrared testing, grinding, wire welding, glue sealing, electric leakage testing and code spraying to obtain the ultra-miniature semiconductor cooler. According to the process, a multi-wire cutting machine is adopted for cutting the wafer, the ultrasonic cleaning time is shortened, the problems of cavities and product deformation are reduced through a die assembly welding method, and the ultra-miniature semiconductor cooler prepared through the method has good cold and hot impact resistance, is not prone to deformation in the wafer electroplating process and is uniform in product heat dissipation.