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China Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
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Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical measurement instrument, the product line covers a wide range of devices for testing various electrical area, such as underground cable fault locating system, power transformer test, AC/DC Hipot test, Insulation resistance test and so on. With rich measurement experiences of innovation combining and advanced technology to provide the most reliable electrical measurement. The design development production and Inspection is performed at the ISO 9001 and CE which gurantee a consistency of high quality products. XZH TEST masters a variety of technologies as well as extended service and support to deliver the highest value to our customers. We sincerely hold the tenet of "quality first, customers supreme, honor commitment trust worthy".Stays commitment R&D about electric power detection equipment and electric power automation, since its foundation, the company keeps living up to the belief of: "Create high-quality brand, casting first-class enterprise image". Also, we make the "steady development, the best quality "as the core concept of the enterprise. Our goal is to provide our customers with reliable test and measurement equipment that more safe and easy to use, we make measurement easier! Xi'an Xu & Hui Electromechanical Technology Co., Ltd expect to strengthen the relationship with world-wide cooperators, and warm-heartedly welcoming business partners to visit our factory for developing the OEM & ODM win-win Cooperation. Our Team Factory scene Training is a core course for all the members and we will organize various trainings to help us to improve our abilities and Let us find the beauty of life. We treasure the time we are learning and studying together. Services We have the ability to innovate new products and technologies. We can provide complete system solutions for your project. We provide online and offline practical and theoretical training. We provide instrument repair and calibration. Certification
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A brief discussion on the necessity of transformer ratio testing 2025-07-07 As an important power supply equipment in the power system, the stable operation of the transformer is directly related to the economic benefits of the end users (enterprises and communities) and the power grid management department, with the focus on high-load railway enterprises that rely on the power grid for operation. The electrified high-speed railway is a major power consumer of the power grid. According to recent statistics, the traction constant is 3,500 tons and 40KM single line, and the daily electricity consumption reaches 100,000 kWh. In order to ensure the operation of power facilities, it is particularly important to test the transformer ratio. The transformer ratio test is mainly to avoid transformer turn-to-turn short circuit failure, open circuit, incorrect connection, and common faults inside or contact of the transformer power switch. In general, we can choose a ratio tester to test the ratio of various types of transformers. The XHBB128 series transformer ratio tester uses a full Chinese menu, which is simple and convenient to operate. It can perform single-phase measurement and automatic testing of three-phase windings. The polarity can be measured for both single-phase and three-phase windings. The connection group can be selected arbitrarily. The ratio value, error, tap value and other parameters of AB, BC, and CA phases can be measured at one time, and the group identification can be automatically performed. The instrument is small in size and easy to carry and use outdoors.
Popularization of power knowledge: Five categories of power cables 2025-07-04 Power cable products are widely used and of various types. They can be divided into 5 categories, and I will give you some general knowledge. Flame-retardant cable: refers to a cable that can extinguish itself within a limited time when residual flames or residual burning; according to the flame-retardant material of the cable, it can be divided into halogen-containing flame-retardant cable and halogen-free low-smoke flame-retardant cable. Halogen-free low-smoke cable produces less smoke and does not emit toxic smoke when burning. It is less corrosive when burning, so it has little harm to the environment. Fire-resistant cable: a cable that can maintain safe operation for a certain period of time under flame burning; widely used in high-rise buildings, subways, underground shopping malls, large power stations and important industrial and mining enterprises and other places related to fire safety and firefighting and lifesaving; mainly used as a power supply circuit for emergency power supply, requiring normal operation during fire, but cannot be used as a high-temperature resistant cable. Magnesium oxide cable: made of copper core, copper sheath and magnesium oxide insulation material. Its material is inorganic, the melting points of copper and magnesium oxide are 1038℃ and 2800℃ respectively, and its fireproof performance is excellent; it is resistant to high temperature (the cable allows long-term working temperature of 250℃), explosion-proof, large current carrying capacity, good waterproof performance, high mechanical strength, long life, and good grounding performance, but it is expensive, complex process, and difficult to construct. Due to the particularity of the raw materials and processes of magnesium oxide cables, multi-core cables with a cross-section of more than 25mm2 are all composed of single-core cables. Branch cable: Branch cable can be widely used in various medium and high-rise buildings such as residential buildings, office buildings, business buildings, teaching buildings, and scientific research buildings, as main and trunk cables for power distribution. The application of branch cables should determine the location of each distribution cabinet according to the building electrical design drawing, provide the model, specification and total length of the main cable; the model, specification and length of each branch cable; the location of each branch joint on the main cable; the installation methods include vertical wall laying, horizontal overhead laying, etc.; the required branch cable hanging head, beam hanging and other accessories model, specification and quantity. Aluminum alloy cable: Its structure mainly includes two categories: non-armored and armored, with or without sheath, and its core wire is made of creep-resistant and high-conductivity aluminum alloy material. Under the premise of meeting the same conductivity, the weight of the alloy cable is half of that of the copper cable with the same current carrying capacity.
Electricity knowledge popularization: Comprehensive knowledge of leakage protection device 2025-06-25 The leakage protector, also known as the leakage switch or leakage circuit breaker, is installed on the low-voltage circuit. When leakage and electric shock occur, the power supply will be automatically cut off within a limited time for protection when the working current value of the protector is reached. The main uses of the leakage protection device are: first, to prevent electric shock accidents caused by leakage of electrical equipment and lines; second, to prevent single-phase electric shock accidents during power use; third, to promptly cut off the single-phase grounding fault in the operation of electrical equipment to prevent electrical fire leakage accidents; fourth, to prevent single-phase electric shock accidents during power use. The leakage protector is mainly composed of three parts: detection element, intermediate amplification link and operation actuator. The detection element is composed of zero-sequence transformer, which detects leakage current and sends out signals; the amplification link amplifies weak leakage signals for different devices (the amplification part can use mechanical devices or electronic devices); after the actuator receives the signal, the main switch switches from the closed position to the open position, thereby cutting off the power supply, which is the tripping element between the protected circuit and the power grid Knowledge point 1: leakage protector and air switch The difference between leakage protector and air switch: the air switch will only trip when a short circuit accident or fault occurs, and the leakage protector will only trip when a person is electrocuted; the capacity of the air switch can be large or small, but the capacity of the leakage protection switch is not easy to increase, usually single-phase. Principle difference: The leakage protector is only used to prevent people from electric shock and leakage. It does not play a protective role when the circuit is overloaded (short circuit); the air switch is used to prevent the circuit from being overloaded (some also have low voltage protection function, the principle can be imagined), it cannot protect against electric shock, but only acts as a fuse. Therefore, the air switch and the leakage switch have different structures and principles, and the two are irreplaceable. Knowledge point 2: Leakage protector and air switch, only install one? In real life, there is no leakage protector, only air switch and knife switch are set, and there is actually a great safety hazard if the leakage protector is omitted. Both the leakage protector and the air switch are protective switches. The former can monitor the leakage current of the protected line and disconnect the circuit when it reaches a certain value. The latter can monitor the large current in the circuit and will trip when the current exceeds a certain value, that is, it has the functions of short circuit and overload protection. The two have different functions respectively. If one is missing, the protection function is lost, and there are safety hazards. Knowledge point 3: What should I do if the protector often trips? The safest insurance method is to ask a professional electrician to help check the leakage of the household circuit. We may not know what method to use, but professionals must know that there are methods and tools. It is simple and easy, but it costs a certain amount of money. Do not install a leakage protector only on the home bus. The wider the protection range of the leakage protector, the greater the probability and frequency of tripping. Therefore, in addition to setting up leakage protectors on the bus, places where leakage and electric shock are prone to occur are also set up. Even if there are places with leakage, there will not be a complete power outage. A simple air switch only has short circuit and overload protection functions; but there is another type that has short circuit and overload protection functions as well as leakage protection functions. Knowledge point 4: Why is a leakage protector installed after protection zero connection (grounding)? Protection zero connection is to connect the metal casing of the electrical equipment to the zero line of the power grid, and install a fuse on the power supply side. When the electrical equipment has a shell contact fault (a phase contacts the shell), a single-phase short circuit is formed on the relative zero line. The short-circuit current is large, and the fuse blows quickly, cutting off the power supply for protection. The working principle is to adjust the "shell collision fault" to "single-phase short-circuit fault" to obtain a large short-circuit current cut-off insurance. However, electrical collision with the shell fault at the construction site is not very frequent, and leakage faults often occur, such as leakage caused by damp equipment, excessive load, too long lines, aging insulation, etc. These leakage current values ​​are small and cannot be quickly cut off. In the case of long-term existence, the fault cannot be automatically eliminated. This leakage current poses a serious threat to personal safety, so it is necessary to install a highly sensitive leakage protector for supplementary protection. Knowledge point 5: What should be paid attention to when installing a leakage protector? The neutral line on the load side of the leakage protector shall not be shared with other circuits; when the leakage protector is marked with the load side and the power side, the wiring shall be installed according to the regulations and shall not be connected in reverse; when a leakage protector with short-circuit protection is installed, it must be ensured that there is enough arc distance in the direction of arc spray; the size of the arc distance depends on the leakage protector.
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