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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 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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Scientific information about cable conductors 2025-12-18 The cable conductor is one of the most important components of a power cable, including the conductor core, metal shielding layer, and metal sheath. In practice, we are most concerned with the conductor core and the metal shielding layer. All grades of power cables must have a conductor core, usually made of high-purity copper or aluminum. The conductor cross-section can be circular, elliptical, sector-shaped, or hollow circular. Small cross-section conductors are generally composed of a single wire, while larger cross-section conductors are composed of multiple strands of wire twisted together. Cables of medium and high voltage grades have a metal shielding layer, and some low-voltage cables with special requirements also have a metal shielding layer. For rubber and plastic power cables, the metal shielding layer is usually made of copper wire or copper tape. Basic Measurement Principle As shown in the figure, a DC power supply E is applied to both ends of the resistor under test. By measuring the circuit current I and the voltage U across the resistor under test, the resistance value RX can be measured using Ohm's law R=U/I. In practice, since the resistor under test RX is a cable conductor, its resistance is small, usually below a few ohms. To eliminate the influence of the voltage and current meter leads and their contact resistance with the resistor RX on the test results, two measurement methods are generally used: the bridge method and the four-terminal constant current method.
Xi'an Xuzhihui welcomes study tour groups: Primary and secondary school students explore power technology 2025-12-16 Xi'an Xuzhihui Welcomes Study Tour Group: Primary and Secondary School Students Explore Power Technology  On December 13, 2025, Xi'an Xuzhihui Electromechanical Technology Co., Ltd. welcomed representatives of primary and secondary school students from the "Run, Learn and Apply" study tour group, embarking on a journey of exploring power technology. During the event, General Manager Zhang used the analogy of "currents like small cars," combining it with Ohm's Law, to explain the principles of power testing equipment development and introduced the company's products, which are exported to more than 50 countries worldwide.  The children then visited the product showroom to learn about "power doctor" equipment such as cable fault testers; they went into the production workshop to witness the manufacturing process of technological products and eagerly asked questions of the engineers; in the testing hall, technicians explained the functions and testing principles of transformers, making abstract concepts more concrete. This study tour broadened the children's horizons and allowed them to experience the innovative achievements of a local technology company. Xi'an Xuzhihui adheres to this philosophy, actively fulfilling its social responsibility, and contributing to science education for young people. The company looks forward to conducting more such exchanges in the future, planting the seeds of scientific exploration in the hearts of children.
Fault Persists Despite 2.5GΩ Insulation? 35kV Cable Flashover Hazard Precisely Locked 2025-12-16 Recently, Xi'an Xuzhihui Electromechanical Technology Co., Ltd. successfully completed a repair task for a 35kV cable flashover fault. The cable, which had been in operation for 5 years and was approximately 2000 meters long, connected a power distribution room at one end and was mounted on a pole at the other.  Fault recording showed an anomaly in phase B, affecting the reliability of power supply in the area, prompting the customer to urgently request repairs. During the initial fault detection, the technical team used an XHMR-5000V insulation resistance tester to perform a relative-to-ground insulation test on phase B. At 5000V, the insulation resistance was measured at 2.5 GΩ, which, based on conventional data, suggested good insulation performance. However, drawing on their extensive operation and maintenance experience, the technicians anticipated a potential deep-seated hidden problem. They then used an XHYB-5/50 test transformer and an XHCC-6/40 pulse energy storage capacitor to build a test system and conduct a DC withstand voltage test. When the voltage rose to 40kV, a flashover breakdown discharge occurred in phase B, ultimately confirming the fault as a "flashover high-resistance fault"—a type of fault that exhibits normal insulation performance under low voltage but cannot withstand the actual operating voltage, making it highly insidious. To accurately locate the fault point, the technical team adopted a "three-step" detection strategy: First, they used the low-voltage pulse method of the XHGG502 cable fault tester to verify the entire length of the cable, confirming that the actual length matched the documented 2000 meters, establishing a baseline for subsequent distance measurements; then, they used the high-voltage flashover method of the same instrument to successfully capture the waveform at the moment of breakdown discharge at the fault point, roughly measuring the fault point distance at 1629.8 meters; finally, they used the XHGX507C pipeline locator to determine the exact route of the buried cable, and then used the XHDD503E cable fault locator for acoustic-magnetic synchronous detection, precisely locating the fault signal at 1630 meters. On-site excavation confirmed that the fault point was at the cable's intermediate joint, perfectly matching the location results, and the repair work was completed efficiently. Regarding this fault resolution, the Xi'an Xuzhihui technical team summarized three key lessons learned:  First, the detection method must accurately match the fault type; the high-voltage flashover method is an efficient and reliable choice for troubleshooting this type of high-voltage breakdown fault. Second, cable joints that have been in operation for more than 5 years are susceptible to the effects of electric fields, heat, and moisture, and should be a focus of daily maintenance. Third, in complex environments such as direct burial and multi-cable parallel installations, confirming the cable path before fault location can significantly improve troubleshooting efficiency. As a professional enterprise in the field of power testing and experimental equipment, Xi'an Xuzhihui has always taken "safeguarding the reliable operation of the power system" as its mission.  With its professional testing equipment and technical team, it provides precise solutions for various power cable faults. The efficient completion of this emergency repair once again demonstrates its technical strength and practical experience in the field of power fault detection. For related technical issues, you can contact the company through its official website www.xzhjdkj.com or by calling 400-029-0829 for support.
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