170results about "Overload protection arrangements" patented technology

The invention relates to the technical field of control systems, and particularly discloses an intelligent control system for an insulation test of a marine dry-type transformer. The system comprises a high-voltage test power supply module, a multi-mode sensing acquisition module, an insulation state evaluation module, a self-adaptive boost decision module and a test process control module, and evaluates an insulation state and dynamically decides a boost rate and a holding strategy by acquiring voltage, leakage current, partial discharge and temperature data in real time. Intelligent control and safety protection in the insulation test process are achieved, potential insulation damage is effectively avoided, and diagnosis precision is improved.

The invention relates to a high-voltage transformer series resonance withstand voltage test system and an automatic tuning method, and relates to the technical field of high-voltage electrical equipment testing, and the system comprises a control module, a signal generator, a resonance circuit, a data acquisition module and a safety protection unit. The method comprises the following steps: initializing system parameters; automatically searching and locking an optimal resonant frequency point; executing a withstand voltage test at the resonance point and monitoring data; and automatically analyzing data and judging performance. According to the invention, through full-closed-loop automatic control, rapid and accurate locking of the resonant frequency and intellectualization of the test process are realized, and the problems of low efficiency, poor precision and insufficient safety of a traditional method are effectively solved. The device has the outstanding advantages of high adaptive capacity, reliable test result and safety and convenience in operation, and is particularly suitable for high-efficiency and accurate standardized test on the insulating properties of various high-voltage transformers in an electric power system.

The invention relates to the technical field of power system energy storage equipment testing, in particular to a small and medium-sized industrial and commercial energy storage cabinet twin-trawling testing system which comprises a main loop, a secondary control loop and an anti-countercurrent detection unit, the main loop comprises double testing loops and four sets of alternating current contactors, and multi-machine twin-trawling testing frameworks such as one-to-one, one-trawling-two and one-trawling-three can be flexibly combined; independent switching between grid connection and grid disconnection is supported, the secondary control loop comprises a button with a lamp and a grouping reset button, and the countercurrent prevention detection unit detects the energy flow direction in real time through an intelligent electric meter and a current sensor and has a mains supply charging function. According to the test system, through a double-loop parallel test architecture and a multi-machine flexible combination design, the system can be synchronously butted with multiple energy storage cabinets to carry out parallel test, the test efficiency can be improved, and a safety system with anti-countercurrent detection, rapid mode switching and precise control protection guarantees the test safety; the arrangement of the standardized terminal and the button with the lamp simplifies the operation difficulty, and reduces the test threshold.

The invention discloses a high-voltage diverter and a sampling device, and belongs to the technical field of diverters, the high-voltage diverter comprises a main body mechanism, and the main body mechanism is internally provided with a disconnection mechanism used for automatic disconnection when a fault occurs and two terminal mechanisms used for wiring; through the linkage design of the built-in temperature sensing piece and the disconnecting mechanism, automatic and accurate fault protection is achieved, when the internal temperature of equipment abnormally rises due to faults and exceeds a safety threshold value, the temperature sensing piece is heated to deform and triggers the disconnecting mechanism, energy stored by the extension spring is used for rapidly driving the on-off connecting piece to act, a main circuit is reliably disconnected, and the safety of the equipment is improved. Meanwhile, the action can be linked with the top protruding block to be self-locked and protrude out of the surface of the protection shell, an intuitive and striking mechanical fault indicator is formed, accident expansion is effectively prevented, definite fault point positioning can be provided for operation and maintenance personnel, the troubleshooting time is shortened, and the safety and maintainability of the system are improved.

The application provides a trigger monitoring device and energy taking method for a thyristor stage circuit in a direct current energy release device, and the trigger monitoring device comprises a fast energy taking circuit 1, a large-capacity energy taking circuit 2, an overvoltage protection circuit 7 and a post-stage function circuit 8; the fast energy taking circuit 1 is used for taking energy during the charging process of the thyristor stage circuit, supplying energy to the overvoltage protection circuit 7, taking energy from an alternating current harmonic when the charging of the thyristor stage circuit is completed and the alternating current harmonic exists between the two ends of the thyristor 9, and supplying energy to the large-capacity energy taking circuit 2 through a one-way current circuit 13; the large-capacity energy taking circuit 2 is used for taking energy from the two ends of the thyristor 9 in a direct current voltage energy taking mode and supplying energy to the post-stage function circuit 8; the fast energy taking and the large-capacity energy taking are combined, the fast energy taking makes the overvoltage protection circuit 7 enter the working state as soon as possible, and the large-capacity energy taking ensures the normal working of the trigger monitoring device.

The utility model relates to measuring alternating current parameter technical field discloses alternating current parameter tester, include: the signal acquisition module for carrying out the collection to the product parameter signal of measurement, prevent the short circuit protection module of instrument appearance short circuit or reverse connection and influence test process, signal acquisition module includes the voltage division unit, filter unit, AD conversion unit that connect gradually, short circuit protection module includes signal amplification unit, signal isolation unit, on-off control unit that connect gradually. The utility model has the advantages of high collection precision, fast speed, good stability by precision resistance voltage division, then filtering processing, and the analog signal is converted into digital signal and handles, can use in high temperature and normal temperature environment, newly added short circuit protection module that can test the protection of product, no matter what kind of circuit problem appears in the process of testing the product, can realize automatic protection, will not influence the alternating current parameter measurement of test instrument to product.

The invention relates to the technical field of battery capacity testing, and discloses a lead-acid battery capacity testing system, which comprises a hardware platform and a software module, and is characterized in that the hardware platform comprises a single chip microcomputer, an ADC detection circuit, a nixie tube display module, a discharge control circuit, a key input module, a cooling fan and a current expansion interface; the software module runs on the single chip microcomputer, is based on an embedded operating system, and is configured to acquire a voltage signal and a current signal of the lead-acid battery in real time through the ADC detection circuit; and calculating the battery capacity by adopting a current integration method based on the current signal, and judging a discharge cut-off point based on the voltage signal. Through deep cooperation of a hardware platform and a software module, accurate and automatic testing of the capacity of the lead-acid battery is achieved, a current integration method is adopted as a core calculation principle, discharging cut-off judgment is carried out in combination with a voltage signal, and the accuracy and reliability of a capacity testing result are ensured.

The invention provides an emergency evacuation method for an electromagnetic compatibility test of a power battery, and the method comprises an environment monitoring module, a water tank emergency protection module, a box moving robot system module, a test wire harness cut-off module, a test room control module, a control box module, and an electromagnetic compatibility test equipment protection module. And all the modules realize safety protection in an emergency scene through signal interaction and action linkage. Through cooperation of multiple modules, the single-dimension limitation of traditional protection is broken through, personnel-equipment-environment triple guarantee is constructed, a full-chain safety closed loop is formed, a full-automatic emergency evacuation process is achieved, manual intervention is not needed from emergency situation detection to transfer of a power battery to a safety area, and the evacuation efficiency and safety are improved.

The invention discloses a sampling overcurrent protection system and method. The system comprises a sampling module, a BMS, a switching element, a PPTC assembly and a voltage dividing module. A battery cell in the battery module is connected with the sampling module through the switch piece, the PPTC assembly and the voltage division module, the sampling module is in communication connection with the BMS, and the sampling module is configured to collect a first voltage signal of the battery cell and send the first voltage signal to the BMS; the first end of the voltage dividing module is connected with the sampling module, the second end of the voltage dividing module is also connected with the sampling module, the sampling module is configured to collect a second voltage signal of the voltage dividing module and send the second voltage signal to the BMS, the switch piece is in communication connection with the BMS, and the BMS is configured to cut off connection between the battery cell and the sampling module through the switch piece according to the second voltage signal. When the electrical core is short-circuited, the resistance value of the PPTC assembly is increased instantly, so that the current is limited, overcurrent protection is realized, the electrical core is not short-circuited any more, the resistance value of the PPTC assembly returns to normal, and the sampling loop works normally.

A control and protection method for a parallel power electronic equipment testing system is disclosed. This method provides fault early warning and protection for the parallel power electronic equipment testing system based on the load characteristics of the equipment under test and the allowable power of the parallel power electronic testing device. This control and protection method is applicable to parallel power electronic power testing systems, enabling the system to reduce the impact of faults on the testing device and equipment under test caused by abnormalities in some modules of the testing system through fault early warning and control protection, thereby minimizing the loss of testing system efficiency and equipment lifespan.

The application belongs to the technical field of accurate checking of power distribution lines, and particularly relates to a characteristic current sending circuit based on a primary and secondary fusion equipment graph model checking system, comprising an isolation DC-DC power supply circuit, a characteristic current signal sending circuit and a PT overvoltage protection circuit. The application is suitable for high-precision automatic topology and checking of power distribution lines. The circuit has the functions of inhibiting PT overvoltage pulses and adjusting the frequency of characteristic current sending, ensures accurate and reliable sending of characteristic current signals, and improves the accuracy and reliability of topology identification.

The invention discloses a self-healing parallel capacitor aging test device and method for an AC power system. The method comprises the following steps: S1, preparation before test; s2, carrying out a first-stage aging test; s3, carrying out a charge-discharge cycle test; s4, performing a second-stage aging test; and S5, detecting after the test. According to the self-healing parallel capacitor aging test device and method for the alternating-current power system, automatic control over the whole test process is achieved, it is guaranteed that test conditions meet the national standard requirement, the influence and closing impact on a power grid in the test process are eliminated, the accuracy and reliability of a test result are improved, and the test efficiency is improved. A standardized method is provided for performance evaluation of the capacitor, and the problems that an existing test device is low in integration and automation degree, poor in test precision, large in power grid influence and insufficient in safety protection are solved.

This invention discloses an automatic leakage current reliability detection circuit and method for IGBT devices. The circuit includes: a PWM control unit; and an interlock detection unit composed of an HTGB test circuit and an HTRB test circuit. The PWM control unit is connected to the interlock detection unit and is used to control the HTGB and HTRB test circuits in the interlock detection unit to automatically perform interlock tests. The interlock detection unit is used to perform HTGB and HTRB interlock tests on the IGBT device to obtain the gate-emitter leakage current or collector-emitter leakage current of the IGBT device. The automatic leakage current reliability detection circuit and method for IGBT devices provided by this invention not only achieves automatic detection of HTGB and HTRB tests, but also protects the device under test when the leakage current is too high, reduces equipment redundancy, simplifies the testing process, and lowers costs.

The invention discloses an integrated power supply device and method for multiple test items of a circuit breaker, and relates to the technical field of circuit breaker testing. Aiming at the problems that two sets of independent power supplies are needed and the operation is tedious in the existing test, the device comprises a rectification module, a power conversion module, a double-winding transformer, two paths of rectification filtering modules, a feedback control module and a switching device. 220V commercial power is converted into direct current through the rectification module, the power conversion module outputs adjustable square wave voltage, after transformation ratio conversion of the double-winding transformer, the two paths of rectification filtering modules output 10-100A adjustable direct current and 40-260V adjustable direct current voltage respectively, and the feedback control module stabilizes the output within the error of + / -2% of a target value. The switching device controls two paths to be independently connected and disconnected through interlocking, and the over-current protection module is triggered to stop when the current exceeds 110 A / 11A. According to the invention, a single device satisfies two test power supply, the size and weight are reduced, the cost is saved, wiring operation and safety risks are reduced, and the test efficiency is improved.

The utility model relates to the field of fuel cells, and discloses an electrolytic tank test conversion system for a solid oxide fuel cell, which comprises an SOFC-SOEC electric pile comprising at least one solid oxide fuel cell unit; the gas supply system comprises a fuel gas supply assembly, an oxidant gas supply assembly and a purging gas supply assembly which are connected with the electric pile; the water supply system is communicated with the electric pile; the temperature control system comprises a high-temperature furnace, a heating element and a temperature sensor, the galvanic pile is installed in the high-temperature furnace, the heating element is arranged between the galvanic pile and a pipeline communicated with the gas supply system and the water supply system, and the temperature sensor is used for measuring the temperature needed by work of the galvanic pile; and a security management and control system. The electrolytic tank test conversion system can quickly switch between an SOFC power generation mode and an SOEC electrolysis mode, and solves the limitation problem that only the SOFC or the SOEC can be tested independently in the prior art.

The invention discloses a test circuit, a surge elimination circuit and a surge elimination method. The surge elimination circuit is coupled between the positive power supply end and the negative power supply end of the test circuit. The surge cancellation circuit includes an impedance element and a first relay switch. The first relay switch is connected in parallel with the impedance element. When the test circuit stops supplying power, the first relay switch is turned on to form a first discharge path. The first discharge path is used for discharging a discharge current generated by the test circuit due to the back electromotive force. After discharging through the first discharge path for a first time, the first relay switch is turned off, and the impedance element forms a second discharge path. Therefore, the surge can be eliminated.

The invention relates to a sensor element with overvoltage protection, comprising: a carrier element; a sensor structure applied or attached to the carrier element for detecting a measurement variable, the sensor structure having a first electrical contact point and a second electrical contact point, the sensor structure being operable by applying a voltage between the first electrical contact point and the second electrical contact point; and an overvoltage protection element applied to the carrier element and comprising a sub-element pair consisting of a first sub-element comprising a first conductor rail and a first pad and a second sub-element comprising a second conductor rail and a second pad spaced apart from the first pad, a first conductor rail electrically connects the first electrical contact to the first pad and a second conductor rail connects the second electrical contact to the second pad, the first pad and the second pad being designed and arranged on the carrier element at a first distance from each other such that a spark gap is formed between the first pad and the second pad.

The utility model is applied to the technical field of electric power automation, and discloses an anti-overload damage electric power system load monitoring device which comprises a bottom shell, an upper cover is fixedly installed at the upper end of the bottom shell through bolts, a center motor is fixedly installed in the lower end of the bottom shell, and a center rod is fixedly connected to the upper end of an output shaft of the center motor. And a sliding switching disc is installed at the upper end of the center rod, and a communication base is fixedly installed in the side surface of the switching disc. According to the electric power system load monitoring device capable of preventing overload damage, the temperature change at the fuse can be accurately monitored through the infrared temperature control switch, the infrared temperature control switch can timely capture the temperature abnormity due to the fact that the temperature of the fuse is rapidly increased when current overload occurs, and compared with a traditional monitoring device, the overload damage can be prevented; the overload detection sensitivity is greatly improved, the abnormal change of the load can be perceived at the first time, and precious time is won for taking protective measures in time.

The embodiment of the utility model provides a current sampling circuit, a battery management system, a battery device and electric equipment, and the current sampling circuit comprises a diverter which is connected with a detected battery cell group in series; the sampling chip is connected with the diverter in parallel and is used for collecting the voltage at the two ends of the diverter and determining the current flowing through the detected battery cell group based on the collected voltage; the first bidirectional protection assembly is connected in parallel between the diverter and the first sampling pin and is used for performing overvoltage protection on the first sampling pin in positive and negative directions; the second bidirectional protection assembly is connected in parallel between the diverter and the second sampling pin and is used for performing overvoltage protection on the second sampling pin in positive and negative directions; the first filtering assembly is connected between the bidirectional protection assembly and the flow divider in series and used for filtering common-mode noise at the two ends of the flow divider. Therefore, the safety and reliability of the current sampling circuit can be improved, faults caused by transient overvoltage and common-mode interference are reduced, and the precision of current sampling is improved.

This invention discloses a device and method for extracting ultra-high frequency (UHF) sensor signals, relating to the field of UHF detection technology. It includes: a sensor connection module for connecting to the output terminal of an UHF sensor to extract the sensor's detection signal; a housing containing the detection module, which provides a detection interface for the extracted UHF sensor detection signal; and a transmission wire, one end of which is connected to the sensor connection module, and the other end of which is connected to the housing. This invention facilitates measurement by operators, eliminating the need for climbing or using ladders, thus reducing measurement time and improving efficiency.

The testing system can have a controller, and a plurality of channels which may have source measure units, each channel individually connectable to one or more electrical connection of a device under test (DUT). A source measure unit can have voltage sources connected to the controller; a pulse generator having an input port connected to the voltage sources, a control port connected to the controller, and an output port; an analog-to-digital converter (ADC); and a current-to-voltage (I / V) converter having a first output port connected to the ADC, an input port connected to the output port of the pulse generator, and a third port connectable to the DUT. The testing system or the source measure unit can further have current limitation units connected in series between the source measure units and / or a fixed voltage reference and the DUT, each current limitation unit having a first transistor and a second transistor configured in a common source or common drain configuration and each having a corresponding gate, the gates having an electrical potential controllable to an intermediary value by the controller.

The invention provides a transient grounding current measurement and diagnosis device and method based on hollow mutual inductor cooperation. The transient grounding current measurement and diagnosis device comprises a mutual inductor module, a data acquisition and conversion module, a signal conditioning and protection module, a master control and storage module, a collaborative algorithm module, an intelligent trigger module, a power supply module, a communication and positioning module and a protective shell. According to the transient grounding current measurement and diagnosis device and method based on cooperation of the hollow mutual inductor provided by the invention, the full waveform of the transient grounding current can be accurately measured, the total underground lightning current can be accurately inverted, and the shunting condition of each grounding path of power equipment can be analyzed in real time; the health state of the grounding system is intelligently diagnosed, a specific fault grounding path is accurately positioned, and the capture rate and reliability of lightning stroke events are improved.

An electronic device includes: a load circuit (M1) having a circuit input terminal (M1.1); a power supply circuit (M2) having a circuit input terminal (M2.1), two circuit output terminals (M2.2), (M2.3) and at least one rechargeable energy storage device (HLC); and a protection circuit (Mx) having two circuit input terminals (Mx.1), (Mx.2) and a circuit output terminal (Mx.3), wherein the at least one rechargeable energy storage device (HLC) is electrically connected to the circuit output terminal (M2.3) of the power supply circuit (M2), such that the battery voltage (V_BAT) of the energy storage device (HLC) or a voltage proportional to it is located at the circuit output terminal (M2.3). The circuit input terminal (Mx.2) is electrically connected to the circuit output terminal (M2.3), such that the input voltage applied to the circuit input terminal (Mx.2) corresponds to the battery voltage (V_BAT) provided by the energy storage device (HLC). Additionally, the circuit input terminal (M1.1) is at least sometimes electrically connected to the circuit output terminal (M2.2) so that, given the output voltage (V_SEK1; V_SEK2) at the circuit output terminal (M2.2), it supports the energy flow from the power supply circuit (M2) to the load circuit (M1), and the circuit output terminal (Mx.3) is electrically connected to the circuit input terminal (M2.1). The circuit input terminal (Mx.1) is adapted to be electrically connected to the circuit output terminal of an external energy source (ES) that provides the power supply voltage (V_EXT). Both the power supply circuit (M2) and the protection circuit (Mx) have at least two operating modes (M2...) in each case. I M2 II Mx I Mx II In operating mode (M2) I In the circuit, the energy storage device (HLC) is switched to the circuit output terminal (M2.2), so that the battery voltage provided by the energy storage device, or a voltage proportional to it, is applied as the output voltage (V_SEK1) to the circuit output terminal (M2.2) (V_BAT = V_SEK1), and in the operating mode (M2... II In this mode, the circuit input terminal (M2.1) is switched to the circuit output terminal (M2.3). In the operating mode (Mx)... I In the circuit input terminal (Mx.1), the circuit output terminal (Mx.3) is switched to the circuit output terminal (Mx.3), while in the operating mode (Mx... II In this circuit, the input terminal (Mx.1) and the output terminal (Mx.3) are electrically isolated from each other. Additionally, the protection circuit (Mx) is adapted to operate in mode (Mx... I The system monitors the battery voltage applied to the circuit input (Mx.2) to determine if its voltage level exceeds a predetermined maximum value and automatically deactivates the operating mode (Mx) under given conditions. I ).

The invention discloses a conduction voltage drop and peak value detection multi-parameter detection circuit which comprises a conduction voltage drop test circuit and a peak value voltage detection circuit which are arranged at the two ends of a tested power device in parallel. Respectively collecting the forward conduction voltage drop and the reverse conduction voltage drop; the peak voltage detection circuit is used for capturing transient peak voltage between a collector and an emitter in the turn-off process of the power device; the output ends of the conduction voltage drop test circuit and the peak voltage detection circuit are isolated and then are connected to the analog-to-digital converter, so that simultaneous detection of multiple parameters of the same power device is realized. The circuit provided by the invention can realize high-precision and high-robustness measurement of positive and negative voltage and transient peak voltage in a complex switching environment.

This utility model relates to the field of electric actuator technology, specifically to a testing device for a brushless motor electric actuator. It includes a power supply unit, a control unit, an angle detection unit, and a motor drive unit. The power supply unit is a power module, the control unit includes an MCU module, the motor drive unit is a brushless motor drive module, and the angle detection unit is a digital angle sensor. Through this method, this utility model can obtain the angle feedback signal of the brushless motor electric actuator body and compare it with the angle data measured by the angle sensor built into the testing device to determine whether the operating data of the electric actuator meets the design requirements. Buttons are used to set the start and end of the test. The test results are displayed on the screen, and different buzzers sound to indicate whether the test is passed or failed. Simultaneously, the power supply voltage and operating current are monitored to ensure the accuracy and safety of the test.

The invention relates to a clamp-type resistor detection device suitable for a dangerous explosion area, which comprises a response coil and an excitation coil which are used for being connected to a detected grounding loop, and a connection loop of the response coil is provided with a first intrinsic safety protection unit; a connecting loop of the exciting coil is provided with a second intrinsic safety protection unit; the first intrinsic safety protection unit comprises a first resistor and a second resistor which are connected in series into a response coil loop; the first diode and the second diode are connected across the two ends of the response coil and are reversely connected in parallel; the first fuse is connected in series into the response coil loop; the second intrinsic safety protection unit comprises a third resistor connected in series into the excitation coil loop; the third diode and the fourth diode are bridged at the two ends of the exciting coil and are reversely connected in parallel; and the second fuse is connected in series with the excitation coil loop. The safety problem that ignition energy is introduced into a dangerous area due to internal faults or external abnormal voltage and current invasion of an inductance element in the clamp type grounding resistance detector is solved.

The utility model provides a portable checking and discharging electric rod for a subway overhead line system. The portable checking and discharging electric rod comprises a checking and discharging electric connecting rod mechanism, an operating rod and a grounding mechanism. One end of the checking and discharging electric connecting rod mechanism is connected with the front end of the operating rod, a connecting mechanism detachably connected with the grounding mechanism is arranged between the checking and discharging electric connecting rod mechanism and the operating rod, and the operating rod is connected with the checking and discharging electric connecting rod mechanism through the connecting mechanism; the checking discharge electric connecting rod mechanism comprises a conductive hanging rod, an insulating rod and a measuring terminal; the conductive hitching rod is connected to the upper end of the insulating rod and is used for hitching a subway overhead line system after power failure; the lower end of the insulating rod is connected with a connecting mechanism and is detachably connected with an operating rod through the connecting mechanism, the operating rod and the insulating rod are coaxially arranged, the measuring terminal is electrically connected with the conductive hanging rod through a connecting wire in the insulating rod, the measuring terminal can be used for detecting the residual voltage of the overhead line system after power failure, and the measuring terminal is further electrically connected with a grounding mechanism. On-site rapid assembly and disassembly are facilitated, the preparation time before operation is shortened, and the operation efficiency is improved.

The invention discloses a multifunctional test tool for small microcomputer protection, and relates to the technical field of power equipment detection. Comprising a test board, a simulation test module and a data acquisition and analysis system are arranged in the test board, a plurality of needle cylinders are installed on the test board, abutting needle heads are slidably connected to the upper portions in the needle cylinders in a limited mode, receding grooves are formed in the upper sides of the abutting needle heads, the receding grooves are used for containing welding spots, and the welding spots are arranged in the receding grooves. A connecting needle head is arranged on the lower portion in the needle cylinder, a spring fixedly connected with the abutting needle head is arranged in the needle cylinder, and elastic arc pieces evenly distributed in an annular mode are fixedly connected to the upper side of the abutting needle head. Electric connection is achieved by means of contact between the elastic arc pieces and the peripheral sides of the welding spots, the mode is different from the mode that in the prior art, a pin welding spot is directly extruded by a probe, the probability that pseudo soldering is covered in the testing process is reduced, and therefore the product quality is improved, the operation and maintenance cost of a user is reduced, and potential threats to an electric power system are reduced.

The present application belongs to the field of extra-high voltage bushing electrical test, and particularly relates to a bushing electrical test automatic conversion device and method, which comprises a remote computer operating system, a conversion control box main body, a conversion control box front panel and a conversion control box rear panel. The front part of the conversion control box main body is provided with the conversion control box front panel. The present application realizes real-time visual monitoring of test state, channel selection and grounding condition through remote operation of a computer interface isolated by an optical fiber, utilization of an integrated system touch screen, multiplexing buttons and multi-color state indicator lights, red dielectric loss output indication, orange partial discharge output indication and green grounding indication. An operator can quickly judge the system operation state through intuitive light signals. The dielectric loss setting button and the partial discharge setting button adopt multiplexing logic design, and channel enabling, switching and grounding control can be completed through simple clicking. In combination with the parameter setting and state monitoring functions of the touch screen, the operation complexity is greatly reduced.