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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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XZH TEST Completes 35kV Cable Fault Location in Gazipur, Bangladesh with Surge Method 2026-09-11 .xzht-news-35kv-b8{font-family:Verdana,Helvetica,"Times New Roman",Arial,sans-serif;max-width:100%;margin:0 auto;color:#333;font-size:14px;line-height:2;} .xzht-news-35kv-b8 *{box-sizing:border-box;} .xzht-news-35kv-b8 p{font-size:14px;line-height:2;text-align:justify;margin:0 0 12px;color:#333;} .xzht-news-35kv-b8 .lead{font-size:15px;color:#2c3e50;} .xzht-news-35kv-b8 .byline{font-size:13px;color:#8a949e;margin:0 0 16px;line-height:2;text-align:left;} .xzht-news-35kv-b8 .hd{font-size:17px;font-weight:bold;color:#1f3a5f;display:block;margin:24px 0 10px;line-height:1.6;text-align:left;} .xzht-news-35kv-b8 ul,.xzht-news-35kv-b8 ol{list-style:none!important;margin:0 0 12px;padding-left:0;} .xzht-news-35kv-b8 li{list-style:none!important;position:relative;padding-left:18px;margin:6px 0;font-size:14px;line-height:2;text-align:justify;color:#333;} .xzht-news-35kv-b8 ul li::before{content:"\2022"!important;position:absolute!important;left:0!important;color:#2c6e9e;font-size:16px;} .xzht-news-35kv-b8 ol{counter-reset:n;} .xzht-news-35kv-b8 ol li{padding-left:26px;} .xzht-news-35kv-b8 ol li::before{counter-increment:n;content:counter(n) "."!important;position:absolute!important;left:0!important;color:#2c6e9e;font-weight:bold;} .xzht-news-35kv-b8 table{border-collapse:collapse!important;border-spacing:0!important;width:100%;margin:12px 0;font-size:14px;} .xzht-news-35kv-b8 th,.xzht-news-35kv-b8 td{border:1px solid #d5dbe3!important;padding:10px 12px!important;text-align:left!important;vertical-align:top!important;font-size:14px!important;line-height:2!important;} .xzht-news-35kv-b8 th{font-weight:bold!important;background:#f4f6f9!important;color:#1f3a5f!important;width:40%;} .xzht-news-35kv-b8 tr:nth-child(even) td{background:#f8fafc!important;} .xzht-news-35kv-b8 .note{border-left:3px solid #2c6e9e;padding:4px 16px;margin:14px 0;line-height:2;text-align:justify;color:#333;background:#f8fafc;} .xzht-news-35kv-b8 .about{margin-top:26px;padding-top:14px;border-top:1px solid #d5dbe3;font-size:13px;color:#66707a;line-height:2;text-align:justify;} A field service team has successfully located a high-resistance flashover fault on a 35kV underground power cable in Gazipur, Bangladesh, using time-domain reflectometry (the low-voltage pulse method) together with the high-voltage surge (direct flashover) method. The fault was pinpointed at 1,629.8 m from the test end on a cable whose measured full length was 1,896.2 m. Gazipur, Dhaka Division, Bangladesh — August 27, 2026 The cable under test was a 26/35kV three-core, 400 mm² XLPE power cable (YJV 3×400 26/35kV) serving a distribution circuit. A fault recording had shown a disturbance on phase B, prompting an on-site diagnostic campaign to determine the fault nature and distance before any excavation work began. How the Fault Was Diagnosed The testing followed a staged diagnostic procedure, beginning with insulation resistance measurement and moving to withstand voltage testing and pre-location once the fault nature was confirmed. The B phase was first measured to ground with an electronic megohmmeter on the 5kV range. The measured B-phase-to-ground resistance was 2.5 GΩ at 5,005V, indicating that the insulation appeared normal at low voltage, so a withstand voltage test was still required. A DC withstand voltage test was then performed using a 5/50 operating console and test transformer. When the B phase reached DC 40kV, a flashover breakdown discharge occurred at the fault point. Based on this behavior, the fault was classified as a phase-B flashover high-resistance fault. Pre-Location Results Two pre-location methods were applied: the low-voltage pulse method and the high-voltage direct flash (surge) method. Using the low-voltage pulse method, the full length of the cable was measured at 1,896.2 m. The direct flash method was then applied; as the voltage rose to 40kV the fault point formed a flashover discharge, and the fault distance was determined to be 1,629.8 m from the test end. ItemDetails Project35kV power cable fault location field test LocationGazipur, Dhaka Division, Bangladesh DateAugust 27, 2026 Cable typeYJV 3×400 26/35kV XLPE power cable Fault typePhase B flashover high-resistance fault Marked cable length2,000 m Measured cable length1,896.2 m Fault distance1,629.8 m Methods usedLow-voltage pulse method and high-voltage direct flash method For very high flashover discharge faults of this type, sampling with the direct flash (surge) method is recommended, as it reliably reproduces the flashover and produces a clear reflected waveform for distance interpretation. Key Takeaways For extremely high flashover discharge faults, the direct flash method is the recommended sampling technique. Most cable faults occur at joints, particularly on joints that have been in service for more than five years. If the cable route is not clearly known, the route must be traced before accurate pinpointing is attempted. This field case in Gazipur demonstrates a reliable, structured approach to diagnosing and pre-locating 35kV cable faults — combining insulation testing, withstand voltage testing and dual-method pre-location to deliver an accurate fault distance before excavation. About XZH TEST: XZH TEST manufactures cable fault location and high-voltage testing equipment, including surge generators, cable fault pre-locators and VLF hipot testers. Its products support efficient fault pre-location, pinpointing and field diagnostics for power utilities, electrical contractors and testing organizations worldwide.
Skagerrak 2 HVDC Submarine Cable Fault Reduces Norway-Denmark Power Interconnection by 245 MW 2026-09-10 .xzh-news-sk2{font-family:Verdana,Helvetica,"Times New Roman",Arial,sans-serif;max-width:100%;margin:0 auto;color:#333;font-size:15px;line-height:2;} .xzh-news-sk2 *{box-sizing:border-box;} .xzh-news-sk2 h3{font-size:17px;color:#1b2a41;margin:22px 0 10px;line-height:1.6;text-align:left;border-left:4px solid #3a6b7d;padding-left:10px;} .xzh-news-sk2 p{font-size:15px;line-height:2;text-align:justify;margin:0 0 14px;color:#333;} .xzh-news-sk2 ul,.xzh-news-sk2 ol{margin:0 0 14px;padding-left:22px;} .xzh-news-sk2 li{font-size:15px;line-height:2;text-align:justify;margin:6px 0;color:#333;} .xzh-news-sk2 table{border-collapse:collapse!important;border-spacing:0!important;width:100%;margin:14px 0;font-size:14px;} .xzh-news-sk2 th,.xzh-news-sk2 td{border:1px solid #d5dbe3!important;padding:10px 12px!important;text-align:left!important;vertical-align:top!important;line-height:2!important;} .xzh-news-sk2 th{background:#eef1f5!important;color:#1b2a41!important;font-weight:bold!important;width:34%;} .xzh-news-sk2 tr:nth-child(even) td{background:#f7f9fb!important;} .xzh-news-sk2 .lead{font-size:16px;color:#24344d;text-align:justify;line-height:2;} .xzh-news-sk2 .grid4{display:flex;flex-wrap:wrap;gap:16px;margin:16px 0;} .xzh-news-sk2 .grid4 .pcard{flex:1 1 calc(25% - 12px);min-width:190px;border:1px solid #d5dbe3;border-radius:6px;background:#fff;overflow:hidden;} .xzh-news-sk2 .grid4 .imgph{height:150px;background:#f0f3f6;border-bottom:1px solid #d5dbe3;display:flex;align-items:center;justify-content:center;color:#8a99a8;font-size:13px;letter-spacing:1px;} .xzh-news-sk2 .grid4 .cbody{padding:10px 14px;} .xzh-news-sk2 .grid4 .cbody h4{font-size:15px;color:#1b2a41;margin:0 0 6px;line-height:1.6;text-align:left;} .xzh-news-sk2 .grid4 .cbody p{font-size:13px;line-height:2;margin:0;text-align:justify;color:#444;} Oslo, Norway — Statnett, Norway’s national grid operator, confirmed that the Skagerrak 2 HVDC submarine interconnector between Norway and Denmark returned to service on 2 September, after nearly three months of unplanned outage triggered by a subsea cable fault discovered on 2 June 2026. Key Facts at a Glance Event Subsea cable fault on the Skagerrak 2 HVDC interconnector (Norway–Denmark) Fault discovered 2 June 2026 Returned to service 2 September 2026 (nearly three months of unplanned outage) Fault location Approximately 30 kilometres off the Danish coastline Cause Long-term material ageing and gradual deterioration of minor pre-existing defects within the cable body Capacity loss 245 MW of cross-border power transfer Full system capacity 1,632 MW of bi-directional power flow Cable commissioned 1977 (close to 50 years of service) Operators Statnett (Norway) and Energinet (Denmark) The Fault and Its Cause The fault point was located approximately 30 kilometres off the Danish coastline. Post-fault underwater surveys and seabed inspections ruled out anchor damage, fishing gear impact or sabotage. Operators concluded that the failure stemmed from long-term material ageing and the gradual deterioration of minor pre-existing defects within the cable body. Commissioned in 1977, Skagerrak 2 has operated for close to 50 years. Impact on Cross-Border Power Transfer The outage cut the cross-border power transfer capacity by 245 MW. The full Skagerrak interconnection system originally delivers 1,632 MW of bi-directional power flow between the two Nordic nations — capacity that is critical for balancing variable hydro and wind power across the regional electricity market. A loss of this scale underlines how dependent the Nordic grid has become on a small number of high-capacity subsea links. Repair Work and Return to Service During the repair window, engineering teams carried out subsea cutting, sealing and jointing work at the fault section. Statnett and the Danish grid operator Energinet stated that this incident highlights the reliability risks facing ageing legacy submarine HVDC assets across Europe. Many cross-border subsea cable links are approaching end-of-life, requiring systematic asset inspection, condition monitoring and renewal planning. Ageing Subsea Assets: A Growing Reliability Risk Industry analysts point out that ageing subsea cable failures often lead to multi-month downtime and substantial market volatility. The event reinforces the growing demand for advanced cable fault location technology, regular condition assessment and modern high-performance HVDC submarine cable replacement programmes. Incidents like the Skagerrak 2 cable failure demonstrate that hidden insulation defects and material ageing in power cables require regular condition monitoring and preventive testing to avoid catastrophic outages. Traditional passive maintenance methods can hardly identify latent cable defects in advance, resulting in long repair cycles and huge economic losses once faults occur. Professional Cable Testing and Fault Location Solutions XZH Test offers a full range of professional cable test and fault location instruments for both submarine and underground power cables, enabling power operators, offshore engineering teams and cable contractors to detect early insulation degradation, identify latent ageing defects, and pinpoint cable fault points rapidly. TDR Cable Fault Locator High-precision TDR, impulse-current and acoustic-magnetic locators that pinpoint underground and submarine cable faults quickly and accurately. High Voltage Impulse Generator Portable surge generators (thumpers) up to 35 kV that break down high-resistance and flashing faults to create a detectable discharge at the fault point. Cable Fault Pinpointer Cable fault pinpointing instrument; precisely locates cable faults with an error margin of no more than one meter. Cable Sheath Fault & Route Locator Sheath fault testers and electromagnetic route/depth locators for locating sheath defects and mapping cable routes before and after installation. By implementing standardized pre-commissioning tests and regular preventive maintenance with XZH Test equipment, power enterprises can effectively reduce unplanned outage time, extend the service life of power cable assets, and ensure the long-term stable and safe operation of ultra-high-voltage transmission and cross-border grid interconnection projects.
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.
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