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Main functions of circuit breaker characteristic tester
2025-03-17The circuit breaker tester under UHV power can help many power workers conduct various power tests more conveniently.According to the GB10963-1999 "Overcurrent Protection Circuit Breakers for Household and Similar Places" standard, conduct a trip characteristic test on the circuit breaker.1) Time current characteristic testFrom the cold state, the circuit breaker should not trip when powered with a current of 1.13In (contracted non trip current) until the agreed time. Then, within 5 seconds, the current should be steadily increased to 1.45 In (the agreed tripping current), and the circuit breaker should trip within the agreed time.Starting from the cold state, the current of the circuit breaker should be 2.55In, and the disconnection time should be greater than 1s. The disconnection time of circuit breakers with rated current less than or equal to 63A should be less than 60s, and for open circuits with rated current greater than 63A. The disconnection time should be less than 120 secon
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Precautions for Transformer Winding Deformation Testing Machine
2025-03-14The UHV power professional production transformer winding deformation tester can help many power workers conduct various power tests more conveniently.Precautions for determining transformer winding deformation:a) The necessary conditions for transformer winding deformation are outlet short circuit, near-field short circuit, multiple overcurrent actions, and collisions during transportation;b) The frequency response curves of the low-frequency part (tens of kHz) can generally overlap well, otherwise it is suspected that the test wiring has poor contact;c) Generally speaking, transformers of 35kV and below (including those undergoing factory renovation) may have poor frequency response characteristics, and original data comparison should be retained during handover;d) The measured frequency response curve is generally between+20 and -80 dB. If exceeded, check whether the test circuit has poor contact or disconnection;e) When the angle winding is tested separately, the three-phase freque
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Product features of transformer no-load loss tester
2025-03-14The UHV power professional production transformer capacity tester can help many power workers conduct various power tests more conveniently.1. It can measure the no-load current, no-load loss, impedance voltage, load loss, and zero sequence impedance of various transformers.2. It can automatically perform waveform distortion correction, temperature correction (providing simple temperature correction and additional loss correction respectively), voltage correction (no-load testing under non rated voltage), and current correction (short-circuit testing under non rated current conditions), which is very suitable for units with slightly larger capacity transformers that do not have short-circuit testing conditions3. It can measure three-phase voltage, three-phase current, average voltage, average current, two-phase active power (due to the two-phase meter method, only the power of phases A and C are displayed here), total power4. It can measure the 2-42nd harmonic content of each phase vol
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Analysis of the advantages and disadvantages of DC and AC in cable withstand voltage testing
2025-03-13The AC resonant test set under UHV power can help many power workers conduct various power tests more conveniently.The two methods of cable withstand voltage testing, AC and DC, each have their own advantages and disadvantages for reference.1、 Cable DC withstand voltage test1. Advantages:If the cable adopts DC withstand voltage method, the leakage current will be very small, and the power of the DC high-voltage generator is also relatively small, so the equipment is lightweight and easy to carry;2. Disadvantages:When using direct current for cable withstand voltage, parasitic charges are easily generated, and the higher the voltage, the greater the charge, and discharge cannot solve the problem at all. Practice has proven that there are many good local insulation problems in cables when conducting DC withstand voltage tests on 35kV and above. At present, AC testing is mandatory for cables of 35kV and above. The DC withstand voltage test is destructive to the cable, and the cable should
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Procedure for using grounding resistance tester
2025-03-12The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.1、 Preparation work1. Carefully read the user manual of the grounding resistance tester, familiarize yourself with the structure, performance, and operation methods of the grounding resistance tester.2. All measuring tools and accessories must be prepared, instruments and grounding probes must be wiped, especially grounding probes, and dirt and rust affecting conductivity on their surfaces must be removed.3. Disconnect the connection point between the grounding main line and the grounding body, or the connection point of all grounding branches on the grounding main line, so that the grounding body is disconnected from any connection and becomes an independent body.Preparation work is an important task before measurement. If these preparations are not made, it is likely that the measurement will not proceed smoothly or the measurement results will not be accurate eno
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Explanation of Common Terminology for High Voltage Test Equipment
2025-03-12The DC high voltage generator under the UHV power can help many power workers conduct various power tests more conveniently.In order to help you have a more comprehensive understanding of high-voltage testing, manufacturers of high-voltage testing equipment have organized explanations of commonly used terms for high-voltage testing equipment, hoping to be helpful to you.1. Dielectric: also known as insulating material, abbreviated as insulation, is one of the most widely used materials in electrical engineering.2. Insulation resistance: The resistance corresponding to the leakage current flowing through a dielectric after applying a DC voltage for a certain period of time.3. Absorption ratio: The ratio of the insulation resistance value at 60 seconds to the insulation resistance value at 15 seconds in the same experiment.4. Polarization index: The ratio of the insulation resistance value at 10 minutes to the insulation resistance value at 1 minute in the same experiment.5. Dielectric l
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How to choose a grounding resistance tester
2025-03-11The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The grounding resistance tester is a commonly used instrument for measuring grounding resistance, and is also an indispensable tool for electrical safety inspection and completion acceptance of grounding engineering. With the rapid development of computer technology, grounding resistance testers have penetrated into many microprocessor technologies, and their measurement functions, content, and accuracy are unparalleled. The grounding resistance tester adopts a new clamp method, which can directly measure online without the need for pile driving and wiring. Controlled by a microprocessor, it automatically detects the connection status of each interface and the interference voltage and frequency of the grounding grid, with unique numerical retention and intelligent prompt functions.Selection of grounding resistance tester:1. At present, intelligent grounding resistan
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Series resonant overvoltage and its conditional characteristics
2025-03-11The series resonance under UHV power can help many power workers conduct various power tests more conveniently.In the power system, some inductive and capacitive components can form various oscillation circuits during system operation or failure. Under certain energy sources, series resonance phenomena can occur, leading to severe overvoltage in certain components of the system.classification(1) The linear resonant overvoltage resonant circuit is composed of inductive elements without iron cores (such as the inductance of transmission lines and leakage inductance of transformers) or inductive elements with iron cores that have excitation characteristics close to linearity (such as arc suppression coils) and capacitive elements in the system.(2) The ferromagnetic resonance overvoltage resonance circuit is composed of inductive components with iron cores (such as no-load transformers and voltage transformers) and capacitive components of the system. Due to the saturation phenomenon of ir
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Characteristics of Transformer Capacity Characteristics Tester
2025-03-10The UHV power professional production transformer capacity tester can help many power workers conduct various power tests more conveniently.1. Can accurately measure the capacity of various distribution transformers, passive measurement, convenient and accurate.2. Equipped with an internal power supply, it automatically generates a three-phase high-power test power supply.3. It can measure the no-load current, no-load loss, short-circuit voltage, and short-circuit loss of various transformers.4. It can automatically perform waveform distortion correction, temperature correction, voltage correction, and current correction (short-circuit testing under non rated current conditions). Operators only need to input calibration indicators according to the transformer type to automatically calculate the corrected results. It is very suitable for units without short-circuit testing conditions for slightly larger transformers.5. Voltage circuit width limit: The maximum voltage can be measured up
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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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