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Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
Xi'an Xu&Hui Electromechanical Technology Co., Ltd. Established on February 1, 2013, and headquartered in Xi'an, China, XZH TEST operates a dedicated four-story R&D and manufacturing facility spanning 3,000 square meters. Leveraging partnerships with prestigious institutions—such as Xidian University, Xi'an Jiaotong University, and various high-voltage research institutes—the company provides advanced high-voltage testing equipment and instrumentation. It serves a wide range of clients, including power system sectors (generation, transformation, distribution, and consumption), research organizations, and manufacturers of power equipment. XZH TEST is a national-level high-tech enterprise integrating research and development, production, sales, training, and service. 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! Our Team We possess a highly experienced professional team, and our product design, R&D, manufacturing, and verification processes strictly adhere to ISO 9001 and CE standards, ensuring consistently superior quality. Dedicated to the research and development of electrical measurement instruments, our product portfolio encompasses a wide range of electrical testing equipment, including underground cable fault location systems, power transformer testing units, AC/DC withstand voltage (Hipot) testers, and insulation resistance testers. Leveraging our extensive expertise in measurement technology and continuous innovation—complemented by comprehensive service and technical support—we are committed to creating maximum value for our customers and delivering the most reliable electrical measurement solutions. Factory scene Our modern manufacturing plant features tidy, well-lit workshops with strict 5S management. Well-organized production zones, complete ventilation and purification systems create a clean, safe working environment, ensuring high-precision production for all power testing equipment. Certification Our enterprise holds complete authoritative qualifications including high-tech enterprise certificate, ISO quality management system certification, dozens of independent patents and professional power industry access licenses. All our power testing equipment passes strict standard performance inspection, full compliance certificates support domestic bidding and overseas export, reliable certification guarantees stable and high-quality products for global power engineering customers.
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10kV Cable Fault Location in Istanbul, Turkey: HV Flashover Method Pinpoints Fault at 172m on 177m YJV Cable 2026-09-04 ISTANBUL, Turkey — A 10 kV underground cable fault location project was recently completed in Istanbul, Turkey, by our cable fault detection team. By combining insulation resistance testing, the low-voltage pulse method and the high-voltage flashover method, engineers pinpointed a leakage-type low-resistance fault at 172 m along a 177 m YJV cable, providing the local utility operator with an accurate excavation reference and reducing outage time to a minimum. Project Profile The target line was a 10 kV medium-voltage distribution cable serving an industrial area in Istanbul. The operator reported a ground fault that tripped the feeder, and the cable was isolated for diagnosis. The key project information is summarized below: Project 10 kV cable fault detection, Istanbul, Turkey Cable model YJV-8.7/10 kV, 3×240 mm² Cable length 177 m (measured by low-voltage pulse method on all phases) Fault nature Leakage-type low-resistance fault Measured fault distance 172 m (high-voltage flashover method at 28 kV) Step 1: Insulation Resistance Testing Using an insulation resistance tester on the 2500 V range, the team measured the resistance of each phase to ground: A-phase 0.03 MΩ (169 V), B-phase 0.04 MΩ (155 V) and C-phase 0.01 MΩ (146 V). The extremely low readings on all three phases indicated a leakage-type low-resistance fault rather than a high-resistance breakdown, and guided the selection of the most suitable fault location methods. Step 2: Low-Voltage Pulse Method The low-voltage pulse method was then applied to measure the cable and evaluate the fault condition. The instrument returned a cable length of 177 m for the C phase, with the other phases also measuring 177 m. The fact that the fault distance could be read directly by the low-voltage pulse method confirmed that the resistance at the fault point had already dropped to an extremely low level. Step 3: High-Voltage Flashover Method To verify the fault distance precisely, the team switched to the high-voltage flashover method. The test voltage was raised to 28 kV, and the fault point was measured at 172 m — just 5 m short of the far cable end. Waveform analysis showed a clear flashover at the fault location, giving the on-site crew an accurate and reliable digging point. Key Takeaways The low-voltage pulse method successfully measured the fault distance, indicating that the resistance at the fault point was already extremely low. During pinpointing, technicians must proceed with great care: because the fault resistance is very low, the discharge sound at the fault point may be extremely faint. Accurate distance measurement (172 m on a 177 m cable) minimizes unnecessary excavation and speeds up power restoration. This project once again demonstrates the efficiency of combining insulation resistance testing, low-voltage pulse ranging and high-voltage flashover verification for 10 kV cable fault location. With professional cable fault locators and experienced on-site engineers, our team helps utility and industrial customers in Turkey and beyond restore power quickly and reduce the economic losses caused by prolonged outages.
IEC Updates Power Cable Standards to Improve Cable Reliability and Testing Requirements 2026-08-21 .gtr-news-e7ce{font-family:Verdana,Helvetica,"Times New Roman",Arial,sans-serif;max-width:100%;margin:0 auto;color:#333;font-size:15px;line-height:2;} .gtr-news-e7ce *{box-sizing:border-box;} .gtr-news-e7ce h1{font-size:22px;font-weight:bold;color:#1f3a5f;margin:20px 0 6px;line-height:1.5;text-align:left;} .gtr-news-e7ce h2{font-size:18px;font-weight:bold;color:#1f3a5f;margin:22px 0 8px;line-height:1.6;text-align:left;} .gtr-news-e7ce p{font-size:15px;line-height:2;text-align:justify;margin:0 0 12px;color:#333;} .gtr-news-e7ce ul{list-style:none!important;margin:0 0 12px;padding-left:0;} .gtr-news-e7ce li{list-style:none!important;position:relative;padding-left:18px;margin:6px 0;font-size:15px;line-height:2;text-align:justify;color:#333;} .gtr-news-e7ce ul li::before{content:"\2022"!important;position:absolute!important;left:0!important;color:#2c6e9e;font-size:16px;} .gtr-news-e7ce .subtitle{color:#666;font-style:italic;margin-bottom:16px;} .gtr-news-e7ce .ref{color:#555;font-size:14px;} IEC Updates Power Cable Standards to Improve Cable Reliability and Testing Requirements Global Power Cable Industry News | XZH TEST News Center Global Power Cable Standards Enter a New Development Stage With the rapid expansion of global power networks, renewable energy projects and electrification, power cable reliability has become a critical concern for utilities and engineering companies. The International Electrotechnical Commission (IEC) continues to improve power cable standards to support safer operation, longer service life and better testing performance. IEC 60502 series standards provide important requirements for power cables with extruded insulation and accessories used in distribution networks and industrial applications. Recent Developments in IEC Power Cable Standards IEC 60502-2 specifies construction, dimensions and test requirements for power cables with extruded insulation from 6 kV up to 30 kV. The updated IEC 60502-2:2014+AMD1:2024 edition introduces technical improvements related to cable construction, conductor temperature calculation, routine voltage tests, oversheath electrical tests and post-installation testing. These updates reflect the increasing importance of cable reliability throughout the entire lifecycle of power cable systems. Why Cable Testing Requirements Are Becoming More Important Modern power systems rely on reliable cable networks. As underground cables and industrial power systems expand, cable failures may cause power interruptions and economic losses. Cable testing helps engineers verify cable performance during manufacturing, installation and operation. Key testing activities include: Routine voltage testing Insulation performance verification Cable accessory testing Installation acceptance testing Fault diagnosis and location Standards Drive Better Cable Reliability International standards help manufacturers, contractors and utilities improve quality control and reduce operational risks. Standardized testing procedures help: Improve cable manufacturing consistency Verify insulation quality Reduce premature failures Increase system reliability The Role of Cable Fault Detection Technology Although standards improve cable design and quality, cable systems still require maintenance during operation. Cable aging, insulation degradation, joint failures and external damage may create unexpected faults. Advanced cable fault detection technologies help engineers: Locate faults accurately Reduce outage time Improve maintenance efficiency Protect critical power infrastructure Technologies such as TDR, high voltage pulse testing and fault distance measurement are increasingly important for modern cable maintenance. Future Trends in Power Cable Testing As global grids become more complex, future cable standards will place greater emphasis on reliability, condition monitoring and advanced diagnostics. The combination of improved standards and advanced testing technologies will help build safer and more resilient power networks. XZH TEST Supports Reliable Cable Maintenance XZH TEST focuses on power cable fault detection and testing technologies, providing practical solutions for utilities, contractors and engineering teams. Through advanced testing equipment and field-oriented solutions, XZH TEST helps customers improve cable inspection efficiency, locate faults accurately and maintain reliable power system operation worldwide. Reference Sources: International Electrotechnical Commission (IEC), IEC 60502 Series IEC 60502-2:2014+AMD1:2024 Power cables with extruded insulation and accessories IEC Technical Committee 20 - Electric cables
XZH TEST Cable Fault Location Case in Chonburi Thailand: 10kV YJV Cable Leakage Fault Pre-Located at 172m 2026-08-27 .xzh-news-7rog{font-family:Verdana,Helvetica,"Times New Roman",Arial,sans-serif;max-width:100%;margin:0 auto;color:#333;font-size:14px;line-height:2;} .xzh-news-7rog *{box-sizing:border-box;} .xzh-news-7rog p{font-size:14px;text-align:justify;line-height:2;margin:0 0 14px 0;color:#333;} .xzh-news-7rog .hd{background:#1f3a5f;color:#ffffff;padding:18px 24px;border-radius:4px;margin-bottom:18px;} .xzh-news-7rog .hd h1{margin:0;font-size:20px;font-weight:bold;color:#ffffff;line-height:1.6;} .xzh-news-7rog .hd .hd-sub{font-size:13px;color:#a8c6e8;margin-top:6px;} .xzh-news-7rog .sec-title{font-size:17px;font-weight:bold;color:#1f3a5f;margin:26px 0 12px 0;display:block;padding-bottom:6px;border-bottom:2px solid #2c6e9e;} .xzh-news-7rog table{border-collapse:collapse!important;border-spacing:0!important;width:100%;margin:14px 0;font-size:14px;} .xzh-news-7rog th,.xzh-news-7rog td{border:1px solid #d5dee8!important;padding:10px 14px!important;text-align:left!important;vertical-align:middle!important;font-size:14px!important;line-height:2!important;} .xzh-news-7rog th{font-weight:bold!important;background:#eef3f9!important;color:#1f3a5f!important;} .xzh-news-7rog tr:nth-child(even) td{background:#f8fafc!important;} .xzh-news-7rog ul{padding-left:20px;margin:0 0 14px 0;list-style:none!important;} .xzh-news-7rog li{position:relative;margin:6px 0;font-size:14px;text-align:justify;list-style:none!important;padding-left:18px;line-height:2;} .xzh-news-7rog ul li::before{content:"\2022"!important;color:#2c6e9e;font-weight:bold;position:absolute!important;left:0!important;} .xzh-news-7rog .tw{overflow-x:auto;-webkit-overflow-scrolling:touch;} .xzh-news-7rog .summary{border-left:3px solid #2c6e9e;padding:2px 16px;margin:10px 0 14px;line-height:2;text-align:justify;color:#333;background:#f5f9fd;} .xzh-news-7rog .about{background:#f5f9fd;border:1px solid #d5dee8;border-radius:4px;padding:12px 16px;margin:18px 0 6px;line-height:2;text-align:justify;color:#333;} XZH TEST Completes 10kV Cable Fault Location Case in Chonburi, Thailand Leakage-Type Low-Resistance Fault on YJV-8.7/10 3×240 Cable Pre-Located at 172m | March 16, 2024 Field Case Report On March 16, 2024, the technical team of XZH TEST completed a 10kV cable fault detection project in Chonburi Province, Thailand, successfully pre-locating a leakage-type low-resistance fault on an underground power distribution cable. Using a combination of insulation resistance testing, the low-voltage pulse method and the high-voltage flashover method, the team located the fault point at 172 meters from the test end, providing a reliable basis for subsequent excavation and repair works. This case demonstrates the practical efficiency of XZH TEST cable fault locating solutions in overseas distribution network maintenance. Case Background The faulty cable is a YJV-8.7/10 3×240mm² XLPE insulated underground power cable serving a distribution network in an industrial zone of Chonburi Province. A ground fault tripped the protection device and interrupted power supply, but visual inspection could not reveal the fault position. Because the cable route runs through a busy industrial area, blind excavation was not acceptable, and XZH TEST engineers were called in to perform precise fault pre-location before excavation. Fault Diagnosis and Pre-Location Process Step 1: Insulation Resistance Test — Using an insulation resistance tester at the 2500V range, the team measured the insulation condition of all three phases to ground. The results were as follows: Phase A to ground 0.03MΩ (169V), Phase B to ground 0.04MΩ (155V), and Phase C to ground 0.01MΩ (146V). The extremely low insulation values indicated a leakage-type low-resistance fault, and the similarity of the three-phase readings suggested a common fault location. Step 2: Low-Voltage Pulse Method — The low-voltage pulse method was then applied to measure the cable length and obtain an initial fault distance estimate. The measurement showed that the cable length of Phase C was 177m, and Phases B and C both measured 177m as well. The fact that the pulse method displayed the fault distance confirmed that the fault resistance was already very low. Step 3: High-Voltage Flashover Method — To confirm the distance, the team applied the high-voltage flashover method at 28kV, which located the fault point at 172m from the test end. Key Test Data Item Parameter / Result Project Name 10kV Cable Fault Detection, Chonburi Province, Thailand Test Date March 16, 2024 Cable Type YJV-8.7/10 3×240mm² XLPE cable Insulation Test (2500V) Phase A to ground: 0.03MΩ (169V) Insulation Test (2500V) Phase B to ground: 0.04MΩ (155V) Insulation Test (2500V) Phase C to ground: 0.01MΩ (146V) Fault Nature Leakage-type low-resistance fault Cable Length (Pulse Method) 177m (Phase C; Phases B and C both 177m) Fault Distance (Flashover Method) 172m at 28kV test voltage Pre-Location Accuracy 5m difference between pulse and flashover methods Technical Highlights Comprehensive Diagnosis Workflow: Insulation resistance testing first confirmed the fault nature, then the low-voltage pulse method provided the cable length, and finally the high-voltage flashover method delivered the accurate fault distance. Cross-Validation of Two Methods: The pulse method result of 177m and the flashover method result of 172m cross-validated each other, greatly improving the confidence of the pre-location before excavation. Handling of Low-Resistance Leakage Faults: For leakage-type faults with very low resistance, the discharge sound at the fault point can be extremely small, requiring careful and patient pinpointing during the final location stage. Minimum Disruption: Accurate pre-location minimized excavation in a busy industrial zone, reducing downtime and repair costs. Field Experience Summary The fact that the low-voltage pulse method could directly display the fault distance indicated that the fault point resistance was already very low. For this type of leakage-type low-resistance fault, the pinpointing stage requires special care: the discharge sound may be very weak, so the operator should use the acoustic pinpointing method in a quiet environment and combine it with the path indicator to confirm the exact fault position before excavation. About XZH TEST XZH TEST provides electrical testing and fault-location solutions for power utilities, substations, industrial facilities, and electrical contractors worldwide. Its cable fault locators, including TDR pre-locators, surge generators and acoustic pinpointers, support fast and accurate inspection, diagnosis and maintenance of power-system equipment and cable networks.
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