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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.
Technology & Type-Test Progress of ±525 kV and ±640 kV Ultra-High-Voltage HVDC Submarine Cables 2026-09-05 .nhvdc20260905{font-family:Verdana,Helvetica,"Times New Roman",Arial,sans-serif;max-width:100%;margin:0 auto;color:#333;font-size:14px;line-height:2;} .nhvdc20260905 *{box-sizing:border-box;} .nhvdc20260905 h1{font-size:21px;font-weight:bold;color:#1f3a5f;line-height:1.6;margin:0 0 4px;text-align:left;} .nhvdc20260905 .meta{font-size:13px;color:#7f8c8d;margin:0 0 14px;line-height:1.8;} .nhvdc20260905 h2{font-size:17px;font-weight:bold;color:#1f3a5f;display:block;margin:24px 0 10px;line-height:1.6;text-align:left;border-left:4px solid #2c6e9e;padding-left:10px;} .nhvdc20260905 p{font-size:14px;line-height:2;text-align:justify;margin:0 0 12px;color:#333;} .nhvdc20260905 ul{list-style:none!important;margin:0 0 12px;padding-left:0;} .nhvdc20260905 li{list-style:none!important;position:relative;padding-left:18px;margin:6px 0;font-size:14px;line-height:2;text-align:justify;color:#333;} .nhvdc20260905 ul li::before{content:"\2022"!important;position:absolute!important;left:0!important;color:#2c6e9e;font-size:16px;} .nhvdc20260905 table{border-collapse:collapse!important;border-spacing:0!important;width:100%;margin:14px 0;font-size:14px;} .nhvdc20260905 th,.nhvdc20260905 td{border:1px solid #d5dbe3!important;padding:8px 12px!important;text-align:left!important;vertical-align:top!important;font-size:14px!important;line-height:2!important;} .nhvdc20260905 th{font-weight:bold!important;background:#f0f4f8!important;color:#1f3a5f!important;} .nhvdc20260905 tr:nth-child(even) td{background:#f8fafc!important;} Technology & Type-Test Progress of ±525 kV and ±640 kV Ultra-High-Voltage HVDC Submarine Cables September 5, 2026 Introduction Global demand for large-capacity offshore wind power and cross-border grid interconnection pushes HVDC submarine cable technology to higher voltage levels. In 2026, the industry has witnessed continuous type-test breakthroughs for ±525 kV commercial-grade submarine cables, while ±640 kV HVDC cable systems are moving from laboratory research into formal pre-qualification verification. Strict testing standards defined by CIGRE TB 852 govern the full qualification workflow, covering electrical endurance, thermal stability, mechanical bending and deep-water simulation conditions for new-generation transmission projects. Latest Qualification Milestones for ±525 kV HVDC Submarine Cables Leading cable manufacturers have completed a series of authoritative type-tests this summer. Nexans finished the full qualification of the ±525 kV mass-impregnated HVDC submarine cable at the CIGRE Paris Session. The cable system including flexible repair joints passed verification for an installation depth up to 3,000 metres, setting a new world benchmark for ultra-deep-sea power transmission, tailor-made for the Crete-Cyprus Great Sea Interconnector project. NKT launched a fully qualified ±525 kV XLPE-insulated submarine cable allowing continuous conductor operation at 90 °C. The upgraded thermal performance increases power transmission capacity and optimises economic design for North-Sea offshore wind clusters managed by TenneT. In China, the complete thermal stability test for domestic ±525 kV HVDC submarine cables has been successfully witnessed by third-party certification organisations, confirming 30-year service reliability under cyclic thermal-electric load conditions. ENTSO-E also opened public consultation on unified assessment frameworks for ±525 kV HVDC land and submarine cable systems across Europe, aiming to harmonise qualification rules for future tender projects. Organization2026 MilestoneTarget Application NexansFull qualification of ±525 kV MI cable with flexible repair joints, verified to 3,000 m installation depthCrete-Cyprus Great Sea Interconnector NKTQualified ±525 kV XLPE cable with 90 °C continuous conductor operationNorth-Sea offshore wind clusters (TenneT) Chinese manufacturersThermal stability test witnessed by third-party certification bodies, 30-year service reliability confirmedDomestic ±525 kV submarine cable projects ENTSO-EPublic consultation on unified assessment frameworks for land and submarine cable systemsEuropean tender harmonisation R&D and Pre-Qualification Progress of ±640 kV HVDC Cable Systems While ±525 kV products enter mass-production bidding cycles, the industry is focusing its next-generation development on ±640 kV ultra-high-voltage HVDC submarine cables. Advanced test platforms that support simultaneous double-circuit verification for ±640 kV-class submarine cables have been built in Asia, capable of simulating extreme working conditions with ultra-high DC voltage and large-ampere cyclic loading. Test procedures for ±640 kV systems follow the latest CIGRE specifications, including: Long-duration DC voltage loading Load-cycle tests Lightning-impulse superposition tests Tension-bending mechanical verification Temporary overvoltage (TOV) assessment These procedures validate insulation stability under complex offshore grid faults. Multiple cable suppliers are constructing dedicated production lines and test facilities for future ±640 kV commercial projects, with pre-qualification testing scheduled from 2026 to 2028. Once fully certified, ±640 kV HVDC submarine cables will deliver significantly higher transmission capacity over longer sea routes for large-scale deep-sea offshore wind farms and cross-continental power interconnections. Higher Testing Requirements for Ultra-High-Voltage Cable Projects The upgrade from ±525 kV to ±640 kV raises stricter technical barriers across the whole industry. Test laboratories and field-test teams must complete full-sequence withstand tests, partial-discharge inspection, thermal cycling evaluation and fault-location verification for complete cable systems including joints and terminations. Reliable high-voltage testing equipment and professional field diagnostic solutions become essential for factory acceptance, site commissioning and long-term asset maintenance of new-generation HVDC submarine cables. Conclusion The global HVDC submarine-cable market is experiencing a critical technical upgrade phase. Proven ±525 kV systems are widely adopted in current offshore wind and island-interconnection schemes, while ±640 kV technology moves steadily toward commercial qualification. Standardised, repeatable high-voltage testing and cable-fault-diagnostic solutions will play a vital role throughout manufacturing, installation and operational lifecycles for ultra-high-voltage power-transmission infrastructure.
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
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