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The necessity of power prevention testing
2025-04-15Preventive testing focuses on "prevention" and "pre prevention". The power equipment operating in the power system needs to undergo strict testing to ensure its safe operation, thereby safeguarding the safety of users' lives and property. Therefore, preventive testing plays an important role in the power system!According to Chinese regulations, power equipment in the power system should be tested in accordance with the requirements of the People's Republic of China's power industry standard DL/T596-1996 Preventive Testing Specification for Power Equipment.The necessity of preventive testing:The power system operates a large number of power equipment, and the safe operation of power equipment is a prerequisite for ensuring the safety and reliability of power generation and supply.There may be some quality issues in the design and manufacturing process of power equipment, and damage may occur during installation and transportation, leading to potential failures. During the op
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What are the characteristics of a circuit resistance meter?
2025-04-15The circuit resistance tester under UHV power can help many power workers conduct various power tests more conveniently.1、 High currentThe circuit resistance tester adopts the latest switching power supply technology, which can continuously output high current for a long time, overcoming the disadvantage of high instantaneous current of pulse power supply, effectively breaking the oxide film of switch contacts, and obtaining good test results.2、 High stabilityIn the case of severe interference, the final data of the LCD can remain stable within ± 1 word range, with stable readings and good repeatability.3、 High precisionThe circuit resistance tester adopts bidirectional high-speed 16 bit sigma delta AD sampling and the latest digital signal processing technology, with a maximum resolution of 0.01 μ Ω. At present, it is a very stable contact resistance tester in China that can achieve a resolution of 0.01 μ Ω, and its performance exceeds that of imported high current micro ohmmeters.4、
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What issues should be noted when using a DC high-voltage generator?
2025-04-14The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.There are several issues to be aware of when using a DC high-voltage generator:1. Please note that only professionals holding a High Voltage Test Certificate are allowed to operate and use the DC high voltage generator.2. During the use of DC high-voltage generators, it is necessary to strictly comply with the provisions of the "Electricity Safety Regulations". At the same time, add two obvious disconnect points before testing the power supply into the device. Before replacing the tested product and wiring, please ensure that both power disconnection points have been clearly disconnected.3. Before testing, the control box of the tester, the voltage doubler, and the grounding wire of the test product must be connected properly. The ground wire of the test circuit should be strictly grounded according to the equipment manual.4. The discharge of large capacit
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How to proficiently use the zinc oxide lightning arrester tester?
2025-04-11The zinc oxide lightning arrester tester under UHV power can help many power workers conduct various power tests more conveniently.The zinc oxide lightning arrester tester is a specialized instrument used to test the electrical performance of lightning arresters. This instrument is suitable for detecting the live or power-off status of lightning arresters of various voltage levels, and promptly detecting dangerous defects such as equipment insulation moisture and valve aging.This device is simple and easy to use. During the entire measurement process controlled by the industrial computer, all measured currents, resistance currents and their harmonics MOA, frequency reference voltages and their harmonics, active power and phase, actual voltage, and large screen current waveforms. The instrument adopts digital waveform analysis, and the harmonic analysis results are accurate. The digital filtering software stabilizes the interference method, accurately analyzes the basic harmonic content
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What are the technical requirements for a grounding resistance tester?
2025-04-11The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The grounding resistance tester, combined with the new lightning protection grounding resistance detection standard, is carefully designed and manufactured for on-site measurement of grounding resistance, soil resistivity, grounding voltage, and AC voltage. The test current reaches 20mA, and digital and microprocessing techniques are used to measure the grounding resistance using the 4-wire method, 3-wire method, and simple 2-wire method. Introducing FFT (Fast Fourier Transform) technology and AFC (Automatic Frequency Control) technology to automatically identify interference and select measurement frequency, minimizing the impact of interference and providing more accurate grounding resistance values.It has unique anti-interference ability and environmental adaptability, with good consistency in repeated testing, ensuring high precision, stability, and reliability
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Basic Introduction of Live Cable Identification Instrument
2025-04-10The live cable identification device under UHV power can help many power workers conduct various power tests more conveniently.The live cable identification device is a flexible coil cable identification device that is convenient for on-site operation. It comes with a built-in lithium battery and can perform live cable identification work without the need for a power source. The live cable identification device is designed for both AC and DC use, and can be powered by a lithium battery or a 220V charger. It is versatile and can identify both operating and non operating cables. So, what are the basic precautions to pay attention to when using the live cable identification device?1. If there is grounding or branching in the middle of the live cable. Only the part before cable grounding or branching can be identified.After adding coupling signals to the cable, no significant effective signals can be detected using flexible coils and receiving boxes. It is recommended to stay about 3 meter
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What are the steps required for oil chromatography analysis?
2025-04-09The oil chromatography analyzer under UHV power can help many power workers conduct various power tests more conveniently.Chromatography analyzer, also known as gas chromatography analyzer. According to the analysis needs of actual samples, instant vaporization injection of packed columns, injection of large-diameter capillary columns, split flow injection of capillary columns, constant volume gas injection of flat rotary valves can be achieved for pyrolysis chromatography.During the use of transformers, it is important to ensure the safety of the machine as much as possible. If problems during the use of transformers need to be discovered in a timely manner, it involves chromatographic analysis of transformer oil. How to conduct chromatographic analysis?It mainly consists of the following steps:1. Take out a certain amount of transformer oilFirstly, prepare a certain amount of transformer oil. After the color of the transformer oil changes, use a test tube or syringe to extract a cert
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The main uses and identification methods of grounding resistors
2025-04-09The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The grounding resistance tester is a resistance measurement device mainly used for measuring grounding resistance, soil resistivity, grounding voltage, AC current, and leakage current in power, telecommunications, meteorological oil fields, construction, lightning protection, industrial electrical, and other fields. Equipment. But different models or environments use different resistance testers.There are several types of grounding resistance measuring instruments, including clamp type (double clamp type), large grounding grid grounding, digital, etc. They not only differ in product characteristics, but also in measurement methods. People usually think that as long as resistance can be measured, but in fact, if mismatched measuring instruments are chosen, not only will it be impossible to accurately measure resistance, but it will also waste unnecessary time and lab
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Four common problems with insulation resistance tester
2025-04-08The insulation resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The insulation resistance tester uses the tested voltage to excite the device or network, and measures resistance using Ohm's law. A large change in insulation resistance indicates potential faults. Therefore, when conducting tests, we need to regularly calibrate the megohmmeter to ensure that the instrument itself has not changed over time.The insulation resistance tester can be used to measure the resistance of various insulation materials, transformers, motors, cables, electrical equipment, etc. Next, let's take a look at some common problems with it.1. What does the output short-circuit current representTransformers with long cables, motors, and multiple windings belong to capacitive loads. When measuring the resistance of such objects, the output short-circuit current can reflect the internal resistance of the output high-voltage source in the megohmme
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Where is the insulation resistance tester suitable for
2025-04-08The insulation resistance tester under UHV power can help many power workers conduct various power tests more conveniently.In daily life and work, the insulation resistance of all electrical devices and equipment must comply with the requirements of relevant specifications and standards to ensure the safety of on-site operations. Whether it is cables, segmented protection equipment, motors, generators, etc., their conductor parts must be isolated with high insulation resistance materials to prevent current from flowing out.Over time, the insulation quality may decrease due to the environment, operating conditions, or other external forces in which the equipment is located. It reduces the resistivity of insulation materials, thereby increasing leakage current, which may cause serious accidents, endanger personal life and property safety, and may lead to factory shutdown and economic losses.The insulation resistance tester is used to measure the resistance of various insulation materials
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Test Method for Capacity Characteristics of Transformers for Capacity Calculation
2025-04-07The UHV power professional production transformer capacity tester can help many power workers conduct various power tests more conveniently.There are many methods for testing and calculating the capacity of transformer capacity testers. Today, let me briefly introduce the testing and calculation method for transformer capacity.Capacity is calculated based on the load rate β M at the highest efficiency of the transformerWhen the calculated load of the building is determined, the total installed capacity of the distribution transformer is:S=Pjs/βb×cosφ2 (KVA) (1)In the formula, Pjs - calculated active load of the building in KW;Cos φ 2- compensated average power factor, not less than 0.9;β B - Load rate of transformer.Therefore, the determination of transformer capacity depends on the selected transformer load factor β B.We know that when the transformer load rate is:The highest efficiency is achieved when β B=β M=Po/PKH (2)In the formula, Po represents the no-load loss of the transforme
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What are the characteristics of cable fault tester?
2025-04-03The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.With the advancement of social technology, the application of technology is very extensive in various aspects of daily life, from travel to water, gas, electricity and other fields, which are very safe and convenient. However, many people have concerns about the installation of raw materials, material selection or overhead of circuit lines in communication or electrification channels. I don't know much about it. In fact, during the entire process, if there is a problem with the cable, it is difficult to determine the problem and repair situation. Therefore, cable fault testers play a very important role in this regard. What are the specific characteristics of cable fault testers?The cable fault tester is mainly used to measure cable fault detection. The cable fault tester has complete functions and is very accurate. It is safe to use quickly. The cable fault tester mainl
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Selection and use of microampere meter in DC withstand voltage test
2025-04-02The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.DC high voltage generator is used to detect the insulation strength of DC precision power supply and converter station equipment and insulation materials under high DC voltage, the corona and ion current of DC power lines and their effects, as well as the leakage current testing equipment of AC and DC power supplies. In addition, it can also serve as a power source for other high-voltage testing equipment, such as impulse voltage generators, impulse current generators, oscillation circuits, etc. Micro ammeter is an important component of DC high voltage generator, used to detect leakage current in voltage testing.When using a microampere meter for a DC high-voltage generator, the following precautions should be taken. The wiring of the microampere meter for a DC high-voltage generator is unreliable or not properly handled during testing, which can easily c
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Reasons for inaccurate test results of grounding resistance tester
2025-04-02The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The digital grounding resistance tester abandons the traditional manual power generation mode. The grounding resistance tester adopts advanced medium to large integrated circuits. The digital grounding resistance tester adopts DC/AC conversion technology, combining the three terminal button and four terminal button measurement methods into a new type of grounding resistance meter. There are many factors that can cause inaccurate readings of grounding resistance in lightning protection testing of grounding resistance testers.1. Due to the fact that the grounding resistance tester tests the grounding resistance of the grounding body through the transmission and reception current of the iron drill rod, there may be mutual interference and errors when the distance between two iron drill rods and between two drill rods and the grounding body is too close. Therefore, in t
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What tests can a DC high-voltage generator perform?
2025-04-01The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.In the daily work of electricity, power workers sometimes come into contact with DC high-voltage generators, which are a type of power device. The staff who have just come into contact with this device would like to know what tests can be performed on the DC high-voltage generator?DC high-voltage generators are mainly used in the power sector, steel industry, metallurgical industry, industrial and mining industry, and other enterprises to conduct DC withstand voltage tests on high-voltage electrical equipment such as zinc oxide lightning arresters, power cables, transformers, etc, And the generator.Taking a 60kV/2mA DC high-voltage generator as an example. This device adopts a high-frequency voltage doubling circuit. Due to the use of high voltage feedback in the device, the output voltage is highly stable. When using a DC high-voltage generator for DC wit
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What is the general insulation resistance test value
2025-04-01The insulation resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The most basic insulation index of a circuit. Low voltage electrical equipment handover test, the insulation resistance of motors, distribution equipment, and distribution lines at room temperature shall not be less than 0.5M Ω (the insulation resistance of equipment and lines in operation shall not be less than 1M Ω/kV). The insulation resistance of low-voltage electrical appliances, their connecting cables, and secondary circuits should generally not be less than 1M Ω; In relatively humid environments, the insulation resistance should not be lower than 0.5M Ω; The insulation resistance of the secondary circuit small busbar shall not be less than 10M Ω. The insulation resistance of Class I handheld electric tools should not be lower than 2M Ω.Insulation resistance: The resistance corresponding to the leakage current flowing through a dielectric after a certain pol
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Measures to reduce soil resistivity
2025-03-31The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.When the soil resistivity at the grounding point (such as rock, sand, and permafrost) is high, measures must be taken to reduce the soil resistivity in order to meet the grounding resistance requirements. These measures include(1) Replace the soil with low resistivity black soil, clay, and sandy clay, and replace it with high resistivity soil. Generally, the soil should be replaced within 1/3 of the upper length of the grounding body and within a range of 0.5 meters around it.(2) If the soil resistivity in the deep part of the grounding point is low, the burial depth of the grounding body can be appropriately increased. Deep burial can also ignore the effect of soil freeze-drying on the increase of electrical resistivity.(3) External lead grounding, burying the grounding body in a low soil resistivity area nearby through metal leads.(4) Chemical treatment involves a
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Why is the test current of the circuit resistance tester at least 100A?
2025-03-28The circuit resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The circuit resistance tester is designed by combining digital circuit technology and switching power supply technology. The circuit resistance tester is suitable for measuring the contact resistance and circuit resistance of switch control equipment. The test current is DC 100A recommended by the national standard. The circuit resistance and contact resistance can be directly measured and digitally displayed at 100A current.Why does the regulation require the use of at least 100A DC current to detect switch circuit resistance?1. Firstly, because there is an oxide film between the switch contacts, if a smaller current is used for detection, the test results will generally be much larger due to the influence of the oxide film, but the oxide film can be broken down under high current. In theory, as long as the test current does not exceed the rated current, the larger t
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What are the advantages of zinc oxide lightning arrester?
2025-03-28The zinc oxide lightning arrester tester under UHV power can help many power workers conduct various power tests more conveniently.1. Zinc oxide lightning arrester has a large current capacityThis is mainly reflected in the ability of lightning arresters to absorb various lightning overvoltages, power frequency transient overvoltages, and operating overvoltages. Tuopu Electric's current carrying capacity fully meets or even exceeds the requirements of national standards. The discharge level, energy absorption capacity, 4/10 nanosecond high current tolerance, and 2ms square wave current capability of the circuit have all reached the advanced level in China.2. Zinc oxide lightning arrester has excellent protection characteristicsZinc oxide lightning arrester is an electrical product used to protect various electrical equipment in the power system from overvoltage damage, with good protection performance. Due to the excellent nonlinear volt ampere characteristics of zinc oxide valve p
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Insulator salt density test
2025-03-27The insulator tester under UHV power can help many power workers conduct various power tests more conveniently.Related terms:1. Reference cap and pin insulatorXP-70, XP-160, LXP-70, and LXP-160 ordinary disc suspension insulators (according to GB/T 7253) are usually measured for site pollution level using 7-9 strings.2. Creepage distanceThe shortest distance between two conductive parts along the surface of the insulator.Note: The surface of cement or other non insulating bonding materials is not considered a component of the creepage distance. If some parts of the insulation of the insulator are covered with a high resistance layer, that part should be considered as the effective insulation surface, and the distance along that part should be included in the creepage distance.3. Unified Specific Creepage Distance (USCD)The ratio of the creepage distance of an insulator to the maximum operating voltage it can withstand at both ends (the highest phase voltage in AC systems), mm/kV。4. Sal
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