Wu Zhong's automatic testing instrument for dielectric loss at different frequencies has good technology

The leakage current monitoring recorder is carefully designed and manufactured for on-site online testing, monitoring, and recording of AC leakage current and current. It consists of a host, ETCR leakage current monitoring software, current clamp, communication line, etc. It is widely applicable in fields such as electricity, communication, meteorology, railways, oil fields, construction, metrology, scientific research and teaching units, and industrial and mining enterprises.

The host is embedded with a Chinese and English operating interface, suitable for engineering and technical personnel from different countries. Its luxurious blue screen LCD display is clear at a glance. At the same time, it has a large storage space that can store 4200 sets of data, and also has an automatic storage interval setting function that can be set from 1 to 60 minutes. The leakage current monitoring software has online real-time monitoring and historical query functions, dynamic display, waveform indication, minimum and average value indication, alarm value setting and alarm indication functions, and historical data reading, viewing, saving, analysis, processing, sorting, fitting curves, reports, printing and other functions.

The current clamp is made of special alloy and adopts CT technology and magnetic shielding technology, which is almost unaffected by external magnetic fields, ensuring high-precision, high stability, and high reliability of uninterrupted monitoring throughout the year. The current clamp lead can be extended according to the distance on site, enabling online monitoring at a distance of 50 meters. This means that the operator can operate the host at a distance of 50 meters to achieve remote online monitoring, which is particularly safe.

Qingdao Tianzheng Huayi Electrical Equipment Co., Ltd. is a high-tech enterprise specializing in the development, design, production, and sales of high and low voltage electrical calibration, testing, monitoring, verification, testing, control technology, and power system automation products. The company has strong R&D and production capabilities, led by well-known experts and scholars in the industry, and has established close cooperative relationships with numerous universities and domestic and foreign peers. With strong technological advantages, we continuously develop and produce high-quality products that meet user needs in high and low voltage electrical testing instruments, such as microcomputer relay protection, energy meter calibration device, instrument calibration device, battery detection, ground grid conductivity testing, high voltage switch testing, and high and low voltage testing instruments.

4.6 Adopt single-sided half wave rectification charging method, with a charging voltage of 100kV. Manual and automatic voltage regulation, continuously adjustable from zero to 100KV. The charging power supply automatically shuts off during ignition and discharge, protecting the safety of the charging transformer and voltage regulation system. The rectifier silicon stack, charging transformer, protective resistor, and DC resistor divider are all installed on the main body, forming an integrated charging device for charging, rectification, and main body, with a simple and beautiful appearance. The impact digital acquisition and measurement system consists of various pre high voltage side impact dividers/splitters (or Rogowski coils), measurement transmission cables, back-end low voltage side secondary attenuators (or matchers), oscilloscopes or high-speed acquisition cards, computers, and acquisition and measurement control software; The system can automatically collect, transmit, measure, calculate, process, record, save, and print various waveforms generated in high-voltage impact tests, meeting the needs of waveform data collection and measurement in different high-voltage impact tests. The system is safe, high-speed, accurate, and reliable, fully complying with and meeting the standards of IEC1083-2 and GB/T16896.1;

The instrument is easy to operate and use. The entire measurement process is controlled by a microcontroller, and it can measure the full current, resistive current and its harmonics, power frequency reference voltage and its harmonics, active power and phase difference of zinc oxide lightning arrester. The large screen can display the real waveforms of voltage and current. The instrument uses digital waveform analysis technology and anti-interference methods such as harmonic analysis and digital filtering software to ensure accurate and stable measurement results. It can accurately analyze the content of fundamental waves and 3-7th harmonics, and overcome the influence of phase to phase interference to correctly measure the resistive current of edge phase lightning arresters. This machine is equipped with a high-speed panel printer and rechargeable battery, making it very convenient for testers to use on site. The instrument adopts a unique high-speed magnetic isolation digital sensor to directly collect input voltage and current signals, ensuring the reliability and safety of the data.

Status, mode switching, fault prompt function, etc; 6) Protection function and information prompt: It has multiple protection functions such as high voltage overvoltage protection, low voltage overcurrent protection, overcurrent protection, as well as detuning protection, zero position, flashover protection, emergency stop, undervoltage protection, etc; 7) Data storage function: saving (manual saving), printing, and retrieval of test results. ① Test results: After the manual or automatic test is completed, the detailed parameters of the test can be displayed in the test results interface. When the test is interrupted, the interruption status can be prompted. The parameters can be saved in a non-volatile memory that can hold 500 sets of test records;

6. Instrument operation 1. Open the outer packing box and carefully remove the filled foam to avoid bumping and damaging the instrument in the box. Check the spare parts inside the box according to the packing list and store them properly. Take the instrument out of the box, put it on the test bench, and remove foam chips and other sundries. The power supply of the test bench should be equipped with a 220V AC power socket with a ground wire, and it must be ensured that the power supply is well grounded. 2. The cleaning of electrode cups is extremely important because insulating liquids are highly sensitive to contamination. Open the electrode cup, first clean all components with solvent gasoline, then wash with detergent, remove and rinse with tap water until neutral, and finally wash 2-3 times with distilled water. Place the cleaned electrode cup components in a drying oven at 105-110 ℃ for 3 hours, then remove them (wearing clean cloth gloves) and cool them to room temperature in a dryer.

Space interference with partial discharge level less than 5pc, equipment and testing follow the standard GB1094.3-2003 "Power Transformers Part 3" GB1094.11-2007 "Power Transformers Part 1" GB1207 Voltage Transformers GB1208 Current Transformers JB/T9641 Test Transformers GB/T16927 High Voltage Test Technology GB7354-2003 " Partial Discharge Measurement" GB4208 Shell Protection Level GB2900 Electrical Terminology GB5027 Typical Fire Protection Regulations for Power Equipment GB10237 Insulation Level and Insulation Test of Power Transformers GB6450 Air Gap for Outer Insulation of Dry Power Transformers DL/T848.3-2004 General Technical Conditions for High Voltage Test Devices Part 3: Transformers without Partial Discharge Test GB4793-1984 Safety Requirements for Electronic Measuring Instruments GB/T2423.8-1995 Electrical and Electronic Products Basic Environmental Testing Regulations

Manufacturer of contact circuit resistance tester

The instrument features a large screen LCD display and a fully Chinese menu operation, making it easy to use. High precision sampling and processing circuits, advanced Fourier harmonic analysis technology, ensure more reliable data. The instrument adopts a unique high-speed magnetic isolation digital sensor to directly collect the input voltage and current signals, ensuring the reliability and safety of the data. This instrument can use electric field induction instead of PT secondary wiring. This instrument can directly measure resistive current without connecting PT 2. This instrument can measure three phases simultaneously and automatically compensate. It is particularly convenient to use and has functions such as resistive current fundamental peak output and edge phase correction. The instrument is equipped with rechargeable batteries, calendar clock, micro printer, and can store 120 sets of measurement data;

1. Unique functional characteristics of TH-2010 partial discharge detector. Product introduction: The research and production unit of the digital partial discharge measuring instrument has developed a partial discharge measuring instrument that has reached the advanced level domestically and internationally. It has won multiple awards such as the second prize of the Ministry of Energy's Science and Technology Progress Award and the third prize of the National Major Technical Commendation Project. We have strong market competitiveness and reputation in terms of product performance, product quality, technical support, etc., and are widely used in high-voltage electrical equipment manufacturing departments such as major power testing and research institutes, power supply bureaus, transformer factories, transformer factories, lightning arrester factories, cable accessory factories, etc. in China (including Taiwan), and exported abroad with good feedback information.

Figure 1 System Principle Block Diagram 2.1 Closing Test Closing Time: The time interval from the moment of receiving the closing (closing) command to the moment when all pole contacts are in contact. In order to have a more intuitive understanding of the closing test, based on the definition of closing time, the closing test process will be represented in the form of a logical timing diagram: 2.2 Opening Test Opening Time: The time interval from the start of the switch opening operation (i.e. the moment when the opening instruction is received) to the moment when the contacts of all poles separate.

4.2.4.2 The control system has the following control functions: using PLC technology, transmitting control commands and feedback device status through two core optical fibers, thus avoiding electromagnetic interference and improving the safety of the control system and computer. The control function has manual, fully automatic, and program control functions, with each level of function facing each other to ensure the reliability of the system. Adopting thyristor voltage regulation method and equipped with charging voltage feedback measurement system. The distance between the ignition ball gap and the cutoff ball gap can be manually and automatically adjusted, and displayed on the LCD panel. A truncated trigger pulse with adjustable delay and a feedback system triggered by generator ignition. By using a function controlled constant current charging method, the stability of the charging voltage can reach 0.5%. The LCD panel can indicate the charging voltage and charging process of the impact generator with an accuracy of 1%. Charging voltage and charging time can be directly input from the LCD panel. Equipped with abnormal charging protection function, it can automatically or manually indicate the working status of the ignition pulse impact generator, such as self ignition, non triggering, abnormal charging, stable charging, etc.

The high and low voltage tester developed by our company is a new type of electrical inspection equipment designed for high voltage metering users. It can detect the transformation ratio and polarity of current transformers used in measuring devices of 35KV and below without cutting off power or changing the line. It can also detect the phase consistency between the primary and secondary transformers, effectively preventing high voltage metering users from stealing electricity by replacing high and low voltage current transformers or current transformer nameplates, and changing the polarity or phase of the secondary line to achieve low billing. This instrument is easy to use, portable, and has a high safety factor, making it a rare detection tool for electricity inspectors. According to user requirements, the high-voltage clamp meter can be equipped with LCD as a separate device for measuring the current of high-voltage lines below 35KV.

The current discharge map can be saved to achieve traceability of test results. Isolation switch is a high-voltage switchgear widely used in power systems. Due to the fact that outdoor isolation switches are electrical equipment that operate completely exposed to the atmosphere and are directly and severely affected by environmental and climatic conditions, their operating conditions are relatively harsh and they are prone to mechanical or electrical failures. Especially the contact part of the touch finger is prone to poor contact caused by rainwater, dust, and harmful gases, leading to heating. The spring that provides pressure to the touch finger will anneal due to heating, causing the pressure to decrease. This further leads to a cyclic heating of the touch finger and ultimately burns out the touch finger, causing accidents. During maintenance, attention is often only paid to replacing springs that have obvious failures or fractures, and it is impossible to judge and replace those springs with reduced pressure. As a result, during further operation, the distribution of current in each contact finger will vary due to different pressures, and the greater the difference, the more uneven the current distribution. After long-term operation, poor contact may occur and overheating may occur. The heating of the touch finger will circulate, and poor contact of one touch finger will spread throughout the entire contact. At the same time, there are many isolation switches with adjustable finger pressure. If the pressure adjustment during maintenance is insufficient or there are differences in the adjustment pressure of each finger, the above phenomenon will also occur.

Firstly, measure the current ambient temperature as the basis for correcting the resistance. Then, automatically select the resistance range according to the input standard parameters, measure the resistance of the three lines of the three-phase stator in sequence, and calculate the resistance imbalance. All resistance values and imbalances are automatically judged to be qualified or not based on the upper and lower limits in the standard parameters. If they are unqualified, terminate the testing of that line and continue the testing process of other lines, followed by an alarm and display. Otherwise, continue with the following testing process. The testing system sequentially applies a DC voltage of 500V (or 1000V optional) between the windings and the casing (ground wire) of each tested machine. The measured insulation resistance is subtracted from the background and displayed as the test result output. When the measured insulation resistance value is greater than 500M, it displays 500M and automatically judges whether it is qualified or not based on the standard lower limit value.

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