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Explain the working principle and application of DC resistance tester
2025-03-07The DC resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The measurement of DC resistance in transformer windings is an important part of its daily testing. By measuring the DC resistance, it is possible to check the quality of the coil, whether the contact position of the tap changer is good, whether the coil or lead is broken, whether the parallel branch is correct, and whether there is a short circuit phenomenon, which is an important data for determining the short-circuit loss. Therefore, this experiment should be conducted after the handover, pre testing, major repair, and replacement of the tap changer. In recent years, with the continuous increase of power system capacity, transformer capacity has also been increasing. The larger the transformer capacity, the higher the voltage level, and the greater the ratio of inductance to resistance. Therefore, the stability time of a large transformer winding DC circuit may be sever
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Precautions for using high-frequency DC high voltage generator
2025-03-07The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.1. Personnel using high-frequency DC high voltage generators must have a professional with a High Voltage Test Certificate.2. When using this instrument, users must comply with the provisions of 168 "Power Safety Regulations" and install two obvious disconnection points before entering the testing instrument with the working power supply. When replacing samples and wiring, it is necessary to clearly disconnect the two power disconnection points.3. Before testing, please check if all test wiring, control boxes, multiplier tubes, and grounding wires of the tested product are connected correctly. The ground wire of the test circuit should be grounded at a single point according to the requirements of this instrument manual.4. Special discharge resistor rod is used for discharging large capacitor samples. Do not immediately come into contact with the test obje
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Operation method of closed flash point tester
2025-03-06The closed flash point tester under UHV power can help many power workers conduct various power tests more conveniently.Usage and operation steps:1. Instrument installation:(1) Open the instrument packaging and check for damage;(2) Check the instrument model and accessories according to the packing list;(3) Debugging can only be carried out after the instrument is checked for accuracy.2. Power on preparation:(1) Insert the power cord into an AC220V three pin socket;(2) Clean the test oil cup with petroleum ether.3. Test program:(1) Turn on the power switch and display the screen;(2) Press the enter system (play) button to display the screen;(3) Press the (self-test) button to enter the self-test interface; Press the (arm lift) button, and the arm will automatically stop when it reaches its maximum height.(4) Put the test oil sample into a cleaned oil cup to the specified mark, place it in the heating bath cover, and then press the (lower arm) button. When the lower arm descends
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Daily maintenance of partial discharge tester
2025-03-05The specialized production of partial discharge testers for UHV power can help many power workers conduct various power tests more conveniently.Partial discharge detectors are used in many industries, and due to different industries, the frequency and environment of use also vary. Usually, in order to ensure accurate detection results and extend the service life of the detector, it is necessary to pay attention to maintenance in daily use. Today, we will carry out daily maintenance work for partial discharge detectors.1、 The moisture-proof work of partial discharge detectors must be taken into account, especially in areas with humid climate. The equipment should be stored in a dry place. If not used for a long time, it should be powered on twice a month for two hours before use to dissipate moisture. Usually used when stored in a place without corrosive gases and substances, the humidity should not exceed 85%.2、 Partial discharge testers can work outdoors in many situations. It is reco
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What is the operation process of the high-voltage switch characteristic tester
2025-03-05The circuit breaker tester under UHV power can help many power workers conduct various power tests more conveniently.The function of the high-voltage switch characteristic tester is mainly to measure parameters such as high-voltage switch point, closing time, formation and speed. The main testing time is the closing and opening time. When using it, it is necessary to strictly follow the relevant regulations of the process. Today, we will specifically introduce the characteristics and operating steps of the high-voltage switch tester.1. Connect the power supply of the high-voltage switch characteristic tester. At this point, we will notice that the cursor points to the dynamic feature and press the confirm button to enter the fracture state.2. Set parameters. After completing the first step, parameters need to be set. If you want to view or change the parameters of the switch, you can press a button to enter the parameter setting state. You can perform vacuum or non vacuum switches on t
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Maintenance Techniques for Transformer DC Resistance Tester
2025-03-04The DC resistance tester under UHV power can help many power workers conduct various power tests more conveniently.Abnormal operation of power transformers can lead to serious safety accidents. Proper daily maintenance and upkeep can ensure the safe and smooth operation of transformers. Today we will share the daily maintenance techniques for transformers.1、 Strengthen daily maintenance and regular inspectionsAccording to the division of labor among management personnel in Taiwan, in addition to regularly carrying out transformer work, I also require management personnel to strengthen daily work and divide responsibilities. The key inspection contents include:1. Observe the appearance. The main inspection is to check for oil leakage, smoking or emission of parts. Loose welding of the transformer casing or unstable rubber pads can lead to transformer leakage. If the oil level is too low, it will lose insulation protection, causing discharge between the conductive parts or between the co
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On site testing program for digital grounding resistance tester
2025-03-04The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.Digital grounding resistance tester, widely used in units such as power, postal and telecommunications, highways, communication, mining, etc. to measure the grounding resistance and superconducting resistance values of various equipment with low resistance values; Meanwhile, the digital grounding resistance tester can also measure grounding resistivity and grounding voltage. The specific testing steps of the digital grounding resistance tester are as follows:1. Measure the grounding resistance firstAlong the tested grounding electrode E (C2, P2), the potential probe P1 and the current probe C1 are spaced 20 meters apart in a straight line, with the potential probe in the middle position of E and C. Insert the probe into the earth as needed.Connect the grounding resistor terminals E (C2, P2), P1, C1 to the probe position using a special conductor.Turn on the power sw
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How to clean the oil cup of the insulation oil dielectric strength withstand voltage tester
2025-03-03The insulation oil dielectric strength tester under UHV power can help many power workers conduct various power tests more conveniently.In the work of power workers, it is often necessary to measure the insulation oil of power transformers and the withstand voltage level of transformer oil. Therefore, an insulation oil dielectric strength tester is needed. After using the instrument, the oil cup needs to be cleaned thoroughly for the next use. If not cleaned properly, it will affect the accuracy of the next time. How to clean the oil cup of the dielectric strength tester and the electrical strength withstand voltage tester that require insulation oil in particular? This article will provide you with a brief introduction.Wipe the electrode surface and electrode rod repeatedly with a clean silk cloth. Adjust the electrode spacing with a standard gauge. Wash 3 times with petroleum ether (do not use other organic solvents), using the following method each time: pour petroleum ether into an
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Solution for measuring transformer over resistance using a DC resistance tester
2025-02-28The DC resistance tester under UHV power can help many power workers conduct various power tests more conveniently.DC resistance measurement is used to check the quality of winding welding and inter turn short circuits; Whether the position of the tap changer is good and whether the actual position is consistent with the indication; Whether the lead wire is broken or loose; The winding of the parallel winding has no broken strands or other phenomena. The measurement of DC resistance is not only an essential inspection item after transformer overhaul, pre testing, and changes in tap changer position, but also an important inspection item after faults.Generally speaking, measuring the DC resistance of transformer windings and high-power inductive devices using traditional methods such as bridge method and voltage drop method is a time-consuming and laborious task. In order to change this situation, shorten measurement time, and reduce the workload of testers, ultra-high voltage power has
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Precautions and common troubleshooting for DC high voltage generators
2025-02-28The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.Test usage precautions:1. To ensure personal safety, users are repeatedly reminded to pay attention to the good grounding of the control box and the double pressure cylinder, as well as the discharge of test samples and double pressure cylinders after shutdown.2. Prevent foreign objects from entering the control box. If there is a fan inside the control box, check if the fan is running properly.3. When the double pressure drum insulation drum is dirty, please wipe it with a dry cloth and do not use organic solvents such as alcohol or gasoline for cleaning. You can use a cleaning agent to clean the surface of the insulation cylinder. It can only be used after air drying. Please put it in the packaging box during transportation or when not in use.4. When replacing the fuse, please replace the fuse according to the amperage indicated next to the fuse holder.5
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Take electromagnetic interference protection measures for microcomputer relay protection tester during use
2025-02-27The relay protection tester under UHV power can help many power workers conduct various power tests more conveniently.Take electromagnetic interference protection measures for microcomputer relay protection tester during useIn the process of substation testing, when electromagnetic protection is replaced with microcomputer protection, the microcomputer relay protection tester must take technical measures to resist electromagnetic interference, that is, strictly follow the installation conditions of the microcomputer relay protection tester, install cable with shielding layer, and the shielding layer at both ends must be grounded. The purpose of doing this is to prevent the microcomputer relay protection tester from being scrapped or malfunctioning due to electromagnetic interference voltage and current caused by a long circuit with one end grounded.In order to reduce the probability of faults and errors in relay protection testers, microcomputer relay protection testers must be designe
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How to extend the service life of zinc oxide lightning arrester
2025-02-25The zinc oxide lightning arrester tester under UHV power can help many power workers conduct various power tests more conveniently.How to extend the service life of zinc oxide lightning arresterThe lightning arresters we see in our daily lives are all zinc oxide lightning arresters. The surface of the lightning arrester is treated with zinc oxide, which can effectively ensure the lightning protection effect, improve the overall practicality, and correspondingly extend the service life. Of course, the price of this zinc oxide lightning arrester is definitely higher. Overall, it is indeed necessary to make a comparison, and choosing a cost-effective lightning arrester is particularly important. But if we want to extend its lifespan, our daily purchase and use are also very important.Firstly, quality must be taken into consideration when making a purchase.We should pay special attention to the quality of zinc oxide lightning arresters when purchasing them. Some devices may look similar, b
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Correctly choose a microampere meter when selecting a DC high-voltage generator
2025-02-25The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.Correctly choose a microampere meter when selecting a DC high-voltage generatorDC high-voltage generators are mainly used in power maintenance departments, industrial and mining, metallurgy, steel and other enterprises to conduct DC withstand voltage tests on high-voltage electrical equipment such as zinc oxide lightning arresters, power cables, transformers, generators, and high-voltage switches.The DC high voltage generator adopts an intermediate frequency voltage doubling circuit, and the new DC high voltage generator adopts PWM pulse width modulation technology and high-power IGBT devices, and adopts special shielding, isolation, and grounding measures according to electromagnetic compatibility theory. High quality DC high voltage testing, portable, capable of withstanding rated voltage discharge without damage.Before using a DC high-voltage generator,
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Precautions for operating the transformer on load switch tester
2025-02-24The on load tap changer tester under UHV power can help many power workers conduct various power tests more conveniently.The transformer on load switch tester is a comprehensive measuring instrument that measures and analyzes the electrical performance indicators of power transformers and dedicated on load transformer tap changers in the power system in accordance with relevant regulations such as the "Code for Handover and Preventive Testing of Power Equipment". regulations. It adopts computer control and can measure parameters such as transition time, transition waveform, transition resistance, and three-phase synchronization of on load tap changers through specially designed measurement circuits. The new testing principle, using computer technology, enables the production site to test the performance of various power transformers on on on load tap changers without dismantling and lifting switches, displaying and printing excess waveforms and parameters.Precautions during operation:1
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Preparation work before using a cable fault tester for testing
2025-02-21The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.What are the preparations before using the cable fault tester?1. Check the normal status of the instrumentBefore using the instrument, you can follow the following steps to check if the instrument is working properly.After the 1.1 pulse is triggered, press the power button and the instrument's main view window will be displayed on the LCD screen. The LCD screen displays text and data such as fault distance, wave velocity, measurement range, and proportion.1.2 Press the panel button, the active cursor in the middle of the instrument moves, and the fault distance data changes accordingly.1.3 Adjust the gain potentiometer, and the waveform amplitude displayed on the instrument screen will increase or decrease.If the range is changed according to the operating steps in the range menu, the range and emission pulse width on the instrument display screen will also change accord
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What is the significance of an insulation oil dielectric strength tester?
2025-02-21The insulation oil dielectric strength tester under UHV power can help many power workers conduct various power tests more conveniently.In order to understand the withstand voltage testing work of the insulation oil dielectric withstand voltage tester, you need to know where the high-voltage power supply is connected. One side of the voltage tester is usually connected to the power safety ground (ground wire). The other side of the power supply is connected to a high-voltage conductor. This power connection can connect a given conductor in two places: high voltage or ground.When you perform two or more withstand voltage tests, you connect one contact to high voltage and all other contacts to ground. Conducting contact testing in this way ensures that it is isolated from all other contacts. What happens when you test something more complex than your first encounter? The series of contacts that connect wires, resistors, capacitors, diodes, and other components is called a "mesh" connecti
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The difference between low voltage pulse and multi pulse in cable fault tester
2025-02-20The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.With the continuous updating of cable fault detector technology, the positioning accuracy of cable fault detectors is also increasing. At present, there are two commonly used detection techniques for cable detection equipment: low-voltage pulse method and multi pulse method. So what is the difference between low voltage pulse and multi pulse of cable fault detector?In the actual work process of cable fault detection and testing, cable faults are generally dominated by high resistance faults and low resistance faults. The low-voltage pulse method and flash method in the pulse method solve low resistance and high resistance cable faults with high accuracy and are not affected by human factors. Therefore, it has become the main application method for power cable fault detection and testing. The working principle of the low-voltage pulse method for power cable faults is to injec
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The significance and precautions of measuring the DC resistance of transformer windings
2025-02-19The DC resistance tester under UHV power can help many power workers conduct various power tests more conveniently.By measuring the DC resistance of the transformer winding and bushing, the welding quality of the internal wire joints of the winding, the welding quality of the leads and winding joints, the tap position of the voltage tap changer and the contact between the leads and bushing, the correctness of the parallel branch connection, whether the current carrying part of the transformer is short circuited, and whether the winding is short circuited can be checked; In addition, in transformer short-circuit testing and temperature rise testing, in order to provide accurate winding resistance, it is also necessary to measure DC resistance. Therefore, the measurement of winding DC resistance is the main item of transformer testing. The handover testing standards are mandatory items;The voltage drop method or bridge method is used to measure the DC resistance of transformer windings.
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What are the specific functions of the series resonance withstand voltage test device?
2025-02-19The series resonance under UHV power can help many power workers conduct various power tests more conveniently.The variable frequency series resonance withstand voltage test device adopts advanced variable frequency and voltage protection control technology, with reliable performance, excellent functions, and simple operation. Using the best series resonance technology and the fastest service team, we bring the best frequency resonance. It is one of the few manufacturers that has passed type test certification and is the preferred pilot test for many customers.The series resonance withstand voltage test device is mainly used in the following aspects:1. AC voltage withstand test for 6kV-500kV high-voltage cross-linked cable2. 6kV-500kV transformer power frequency withstand voltage test3. AC withstand voltage test for GIS and SF6 switches4. Generator AC voltage withstand test5. AC withstand voltage test for other high-voltage electrical equipment such as busbars, bushings, transformers,
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How to use a microcomputer relay protection tester for frequency slip testing
2025-02-18The relay protection tester under UHV power can help many power workers conduct various power tests more conveniently.When using a microcomputer relay protection tester for testing, there is a type of test that you often need to use, which is frequency slip testing. When conducting testing, the process is quite complex and needs to be taken seriously. This article will briefly introduce how the microcomputer relay protection tester performs frequency slip testing.The rated working voltage and output voltage value under rated working conditions are generally 57.740V. Rated operating frequency: The frequency value output during testing, usually 50Hz. Calculate the current and output current values of the load under rated conditions. Load overcurrent: Based on voltage, the load control current can be offset at different angles relative to other voltages. Pre fault time refers to obtaining the output no-load (or load) state during the pre fault time, which is usually mainly used to analyze
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