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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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Popular Science Lesson: Classification of Power Cables 2025-11-13 Classified by voltage level: The function of power cables is to transmit and distribute electrical energy. The two most important technical parameters of electrical energy are capacitance and voltage, especially voltage, i.e., voltage rating. The rated voltage of a cable is usually expressed as u₀/u, where u₀ is the design voltage between the cable core conductor and the metal outer sheath or metal shield, also called phase voltage, and u is the design voltage between the core conductors, also called line voltage. In my country, there are 19 types of cables classified according to their rated voltage level. Power cables are generally divided into the following four categories based on voltage level: (1) Low-voltage power cables, U≤1kV, 0.6/1, 1/1kV; (2) Medium-voltage/medium-high-voltage power cables, 6kV≤u≤35kV, 3.5/6, 6/6, 6/10, 8.7/10, 8.7/15, 12/15, 12/20, 18/20, 18/30, 21/35, 26/25kV; (3) High-voltage power cables, 63kV≤U≤220kV, 36/63, 48/83, 64/110, 127/220kV; (4) Ultra-high-voltage power cables, U≥330kV. For on-site withstand voltage tests of 190/330kV and 290/500kV power cables, whether DC or AC, the reading voltage Uₛ is determined primarily by the cable parameter u₀/u, in addition to considering the cable's structural type and insulation material. Locating faults in the main insulation and sheath insulation of power cables generally involves applying different voltage levels to the faulty cable; the maximum test voltage is also determined based on the cable parameter u₀/u. Classification by Insulation Material: Power cables are mainly composed of two parts: conductors and insulators. Currently, the conductor material is mainly aluminum and copper, while the insulation material is more varied, determining the structural type and main performance of the power cable. They are generally classified into two main categories: oil-impregnated paper-insulated power cables and plastic-insulated power cables, which are described below: Oil-impregnated Paper-insulated Power Cables:  Oil-impregnated paper-insulated power cables are a type of cable with a long history of application and wide distribution. Their insulation material is a composite of insulating paper and an insulating impregnating agent. Depending on the impregnating agent and structure, there are several types. Ordinary Adhesive Oil-impregnated Paper Cables: Their insulating impregnating agent is a mixture of low-voltage cable filament and rosin. They are widely used in voltage levels of 35kV and below. Structurally, they are usually divided into two types: uniform sheathed and phase-separated lead (aluminum) sheathed. For 10kV and below, the insulated cores all have a metal (lead or aluminum) sheath, which is the phase-separated lead (aluminum) sheathed type. Each insulated core of a 20-35KV cable has a metal (lead or aluminum) sheath, i.e., it is divided into lead (aluminum) sheathed type. The cable structure is shown in the figure.
XHHV535-4Z High Voltage Pulse Generator: One unit does the work of multiple units 2025-11-12 Why choose this portable high-voltage pulse generator? Integrated design, ultra-lightweight It integrates a DC high-voltage source, energy storage capacitor, and discharge sphere gap into one unit, replacing the traditional multi-device combination and only one-third the size of the traditional equipment! It can be easily carried by one person or one vehicle. Safe and reliable, intelligent protection It features triple automatic protection against overcurrent, overvoltage, and overheating. High-voltage operation allows for direct short-circuit to ground without fear of damage. The zero-position start design and high-precision pointer display provide real-time feedback on voltage and current status, ensuring safer operation. Fully functional, multi-purpose It supports DC withstand voltage testing and impulse discharge functions, with controllable and adjustable discharge energy, suitable for various power cable fault detection scenarios. With a built-in 4μF capacitor, the output pulse is uniform and stable, making the discharge process at the fault point clear at a glance. Human-centered design, precise control Unique high-voltage measurement technology allows the voltmeter to display the capacitor voltage in real time, even when the circuit is stopped, making the high-voltage status "transparent and visible." The discharge interval time can be freely set to flexibly adapt to on-site requirements. ● Impulse Voltage: 0～32kV (default 0～28kV) ● Burn-through Voltage: 0～28kV ● Short Circuit Current: 0～320mA ● High Voltage Accuracy: Class 1.5 ● Built-in Capacitor: 4μF ● Discharge Energy: 0～2048J (default 0～1568J) ● Operating Power Supply: AC 220V±10%/50Hz ● Environmental Adaptability: -25℃～+65℃ If you would like to learn more about our products or schedule a live demonstration, please feel free to contact us!
Armor Layer Short Circuit Fault 2025-11-10 A photovoltaic power plant in Shaanxi Province, which should have been operating at its peak during the summer, was brought to a standstill by a strike from a critical cable. A YJV 3*120-800V armored low-voltage cable, like the power plant's "artery," was 1335 meters long, buried deep underground, connecting the photovoltaic panels to the transformer substation. When a low-resistance short circuit occurred in the armor layer (insulation resistance 0MΩ, armor resistance only 3Ω) between phases B, power generation losses accumulated every hour, making emergency repairs imperative! Have your cables ever experienced a similar "problem"? Step 1: Determine the type of fault Using the 1000V range of the XHMR-5kV insulation resistance tester, the insulation resistance of phases A, B, and C, as well as all phase-to-phase and phase-to-ground insulation, was measured. Phases A and C both showed resistance above 1 GΩ, while phase B showed 0 MΩ, with phase-to-phase insulation above 1 GΩ. A subsequent multimeter test of the armor layer on phase B showed a resistance of 3 Ω. Step 2:Test cable length Step 3:Coarse detection of cable faults 1. Using a low-voltage pulse test on phase B of the photovoltaic area, a short-circuit waveform was obtained, and it was roughly determined that the fault point was about 30 meters away from the test end. 2. Then, use the high-voltage flashover method to roughly measure the fault distance in the photovoltaic area and confirm it again. Step 4: Precise Positioning The cable path on site is clear. Main insulation fault location: acoustic method and acoustic-magnetic time-of-flight method. 1. Use an integrated XHHV512-12L high-voltage pulse generator to apply a high-voltage pulse to the faulty phase. 2. Use a 503E locator to pinpoint the fault within the coarse measurement range, using acoustic method and acoustic-magnetic time-of-flight method. 3. Finally, the fault point was found 30 meters away from the test end. Summary and Sharing 1. For locating low-voltage cable faults, the pulse voltage should not be too high compared to high voltage, as this will reduce the discharge energy at the fault point, resulting in a very quiet discharge sound and making precise location more difficult. The solution is to increase the capacitance of the high-voltage source, thereby increasing the discharge energy at the fault point and amplifying the discharge sound. 2. Low-voltage faults require repeated verification using multiple testing methods to prevent misdiagnosis due to armor-to-ground discharge. For the faults mentioned above, we used the low-voltage pulse method, high-voltage flashover method, acoustic method, and acoustomagnetic time-of-flight method.
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