HAIVO Electric welcomed a delegation from TANESCO (Tanzania Electric Supply Company Limited), the state-owned utility responsible for power generation, transmission, and distribution across Tanzania.
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Zhejiang Haivo Electrical Co., Ltd., a leading high-tech manufacturer and global supplier of power transmission and distribution equipment, today announced that it has successfully won a competitive international tender issued by Electricity Distribution Lanka (Private) Limited (EDL).
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On July 18, 2026, Zhejiang Haivo Electric Co., Ltd. welcomed a client delegation from Tanzania for a comprehensive pre-shipment product inspection at its manufacturing facility in Yueqing, Zhejiang Province.
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Zhejiang Haivo Electric Co., Ltd., a leading supplier of power transmission and distribution equipment, is pleased to announce that it has successfully passed the ISO tri-certification audit on July 17, 2026, officially obtaining three internationally recognized management system certifications.
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The 139th China Import and Export Fair (Canton Fair), which opened in Guangzhou on April 15, has witnessed an unprecedented surge in overseas buyer attendance, reaffirming its status as the premier barometer of China's foreign trade momentum.
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In the world of electrical power systems, zinc oxide (ZnO) surge arresters are the unsung heroes. When a lightning strike reaches the line, or a switching operation sends a voltage spike racing through the system, it's the surge arrester that steps in, clamping that overvoltage and diverting the energy safely to ground.
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The global energy landscape is undergoing a seismic shift, driven by the integration of renewable sources like wind and solar. This transition from centralized, fossil-fuel-based generation to distributed, inverter-based resources (IBRs) presents unique challenges for grid protection, with overvoltage management being paramount. At the heart of this defense are modern surge arresters, whose role and configuration strategies have evolved dramatically to ensure the stability and reliability of today's complex power grids.
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The KEMA certification is a significant milestone for HAIVO Electric, underscoring its commitment to engineering excellence, product safety, and reliability. The comprehensive test protocol evaluated the arresters' critical performance parameters under simulated real-world conditions, including designated discharge current tests, residual voltage tests, long-duration current impulse tests, and thermal stability assessments.
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The evolution of the traditional power grid into a Smart Grid is fundamentally driven by the integration of intelligence, connectivity, and data analytics into its physical infrastructure. Among the critical components safeguarding this infrastructure are surge arresters (SAs), traditionally passive devices that protect equipment from lightning strikes and switching overvoltages by diverting excess current to earth. In the Smart Grid paradigm, these vital protectors are transforming into active "Guardian Nodes" through the integration of advanced monitoring capabilities. This transformation enables real-time condition awareness and paves the way for predictive maintenance, dramatically enhancing grid reliability and operational efficiency.
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In the intricate ecosystem of a modern power grid, ensuring the relentless reliability and longevity of expensive equipment is paramount. Among the myriad threats to transformers, circuit breakers, and switchgear, transient overvoltages stand out as a pervasive and potentially catastrophic risk. These short-duration, high-amplitude voltage spikes can originate from lightning strikes (external) or switching operations within the grid itself (internal). The first and most critical line of defense against this invisible threat is the Surge Arrester (SA). This article delves into the core functionality of surge arresters and provides a structured framework for selecting the optimal protection scheme for your grid assets.
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A surge arrester is a line of defense that prevents damage to electric systems. But just as in the case of protective devices, it has to be tested regularly. It should be tested frequently to make sure that it is functioning within safe parameters and offering protection.
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For decades, the core mission of the surge arrester has remained constant: to protect electrical equipment from transient overvoltages, whether caused by lightning strikes or switching operations, by providing a low-impedance path to earth and swiftly restoring normal system operation. However, the means to achieve this mission are undergoing a radical transformation. Driven by the demands of modern power grids—increasing renewable integration, digitalization, and the need for greater reliability—arrester technology is moving beyond its traditional, passive role into an era of smart, adaptive, and highly resilient components.
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For decades, the core mission of the surge arrester has remained constant: to protect electrical equipment from transient overvoltages, whether caused by lightning strikes or switching operations, by providing a low-impedance path to earth and swiftly restoring normal system operation. However, the means to achieve this mission are undergoing a radical transformation. Driven by the demands of modern power grids—increasing renewable integration, digitalization, and the need for greater reliability—arrester technology is moving beyond its traditional, passive role into an era of smart, adaptive, and highly resilient components.
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Surge arresters are used to guard electrical systems against surges due to lightning arcs or switching procedures. Nevertheless, failure may occur if they are not connected properly. Understanding how to connect a surge arrester can guarantee safety and reliable operation.
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Distribution line surge arresters (DLSAs) serve as critical protective devices installed on overhead power distribution systems, typically rated between 1 kV and 38 kV. Their primary function is to safeguard electrical equipment, transformers, and infrastructure against transient overvoltages caused by lightning strikes, switching operations, and other electrical disturbances.
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MOSCOW, RUSSIA – From December 2nd to 4th, 2025, Zhejiang Haivo successfully participated in the International Electrical Grid Equipment Exhibition in Russia, presenting its latest innovations in electrical protection and power distribution technology.
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Transmission line surge arresters (TLSAs) are critical components in modern power systems, safeguarding insulation and equipment from lightning and switching overvoltages. This article provides a detailed technical examination of TLSAs, covering their operating principles, structural design, material science, key performance parameters, installation considerations, and proactive strategies for failure prevention and condition monitoring.
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For grid operators and infrastructure developers, achieving the coveted "five nines" (99.99%) of reliability is the ultimate goal. This translates to less than 52 minutes of unplanned outage per year. So, how do our advanced surge arresters form the cornerstone of this ultra-resilient power supply?
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In the world of power systems, overvoltage events are an ever-present threat to critical infrastructure. This technical analysis delves into the engineering breakthroughs behind our latest polymer-housed surge arrester, exploring how its advanced metal-oxide varistor (MOV) technology, superior thermal management, and integrated monitoring capabilities work in concert to reduce the risk of equipment failure to a negligible level, ensuring unprecedented network resilience.
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Electrical systems form the foundation of everyday life, and it is crucial to protect them from damage or failure. Surge arresters and lightning arresters are common components used to protect these systems. Though they are similar, there are key differences in how they are used.
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Surge arresters are critical components in electrical systems, designed to protect equipment from transient overvoltages. However, like any other equipment, they can deteriorate over time and eventually fail. This article discusses two effective diagnostic techniques for identifying potential arrester failures: leakage current analysis and infrared thermography. By implementing these methods, maintenance professionals can detect early signs of degradation and prevent catastrophic failures.
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The proper selection and application of surge arresters are critical for ensuring the reliability and longevity of medium-voltage (MV) distribution systems. While the fundamental physics of lightning and switching surge protection is universal, international standards offer different methodologies for arrester specification. This article provides a technical guide for engineers on selecting and configuring metal-oxide surge arresters (MOSA) for systems rated 10kV and below, highlighting the key differences between the prevalent IEC and IEEE standards.
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In the vast and complex architecture of a modern power grid, every component plays a critical role in ensuring reliability, safety, and efficiency. Two such components, often visible on transmission towers and substation structures, are insulators and surge arresters (or lightning arresters). To the untrained eye, they might appear similar—both are attached to structures and have a stack of porcelain or polymer sheds. However, their functions are fundamentally different and complementary. Understanding this distinction is key to appreciating the engineering behind a resilient electrical network.
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Selecting the right surge arrester is a critical decision for protecting electrical assets and ensuring grid reliability. This technical article provides engineers, procurement specialists, and system designers with a comprehensive guide for 2024. We delve into the fundamental differences between station-class and distribution-class arresters, analyze the key selection parameters beyond the datasheet, and offer a practical framework for optimal outdoor arrester selection.
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IntroductionMetal Oxide Varistors (MOVs), serving as the core components of Surge Protective Devices (SPDs), critically determine overvoltage protection performance in power systems and electronic equipment.
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Metal Oxide Varistors(MOVs) are the cornerstone of overvoltage protection in modern electrical and electronic systems. Understanding their failure modes is critical for ensuring system reliability and safety. This article provides a detailed technical analysis of the three primary failure mechanisms for MOVs: moisture ingress, progressive aging, and thermal runaway. We will explore the root causes, characteristic signatures, and methodologies for distinguishing between these modes post-failure.
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Surge arresters in vital components that offer protection for electrical systems. To ensure continuous operation, one parameter you should consider is the Maximum Continuous Operating Voltage (MCOV). Amongst other things, this blog will explain how to calculate the MCOV of surge arresters.
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Medium-voltage porcelain-housed distribution arresters are being largely replaced by composite-housed arresters. This is a clear industry trend.
Read More The complexity of modern electrical systems makes them exposed to power surges and overvoltage. These electrical issues, even when they occur in a minority, can wreak havoc on your systems. That's where surge arresters protect your electrical equipment.Ever wondered how surge arresters work?
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Power systems are the backbone of a modern society, but they're constantly at risk from power outages caused by lightning strikes and switching surges. Surge arresters are used to protect equipment like transformers and circuit breakers from damage when this happens.
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Surge arresters are the perfect safeguards for your electrical systems. They direct any excessive current to the ground in the case of a surge to make sure your equipment is safe. In this guide, we will explore the different types of surge arresters and their working principle.
Read More When there is a power surge, electrical systems without protective defenses are often vulnerable to damage. That's why devices like surge protectors and surge arresters are crucial. Although one serves as a substitute for the other, they serve different purposes.
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Zinc oxide is very important in surge arrester design. It has resistance that changes a lot, which helps stop dangerous voltage spikes. The material reacts fast to surges and gives strong protection. Zinc oxide surge arrester blocks use special sealing methods. These methods make them last longer.
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Choosing the right surge arrester depends on the risk type. Type 1 surge arrester protects against lightning strikes. It also stops big surges at the main entrance. Type 2 surge arrester handles smaller, quick surges inside the building.
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Lightning strikes, power surges, and voltage fluctuations are not just inconveniences—they can seriously damage your electrical equipment. Whether it's a computer at home, industrial machinery, or sensitive electronic devices in an office, protecting against these sudden power spikes is essential.
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Surge arresters in tropical/desert/coastal regions face triple threats: - Hydrolysis degradation under high T/H (>45℃, 95%RH) - Molecular chain scission by strong UV (≥200W/m²) - Electrochemical corrosion at sealing interfaces Conventional silicone rubber hardens/cracks within 18 months
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On July 13, 2025, Zhejiang Haivo Electrical Co., Ltd. achieved successful recertification of three critical international management systems:- ISO 45001:2018 Occupational Health & Safety- ISO 9001:2015 Quality Management- ISO 14001:2015 Environmental Management
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Zhejiang Haivo Electrical Co., Ltd., a prominent manufacturer of high and medium voltage power transmission and distribution equipment, is proud to announce its recognition as a Zhejiang Provincial "Specialized, Refined, Unique, and Innovative" Small and Medium-sized Enterprise (专精特新 SME).
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A surge arrester is a crucial component in electrical systems, designed to protect electrical equipment from voltage spikes caused by lightning strikes, switching operations, or transient faults. The effectiveness of a surge arrester largely depends on the materials used in its construction, as they
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Surge protection is crucial in safeguarding electrical and electronic devices from voltage surges or transient overvoltages that can cause damage or malfunction. Two commonly used devices for surge protection are surge diverters and surge arresters. In this article, we will explore the key differences between these two devices and their respective functions in protecting against electrical surges.
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In our modern world, electricity powers nearly every aspect of our lives. From the lights in our homes to the machines in our factories, our dependence on electrical systems is undeniable. However, this reliance comes with its fair share of challenges, one of which is the occurrence of electrical su
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At some point, all electrical equipment has an end-of-life-event (EOLE). Sometimes this event can be as benign as being removed and replaced with a newer device, but it can also be the by-product of a thunderous overload. In the case of distribution surge arresters, such a thunderous overload can trigger either a short or long-term outage.
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Lightning accounts for about 60% of all transmission line trippings in China and is closely linked to season as well as region. Based on the physical processes, lightning overvoltages can fall into two broad categories: those caused by direct strike to the tower, shield wire or conductor; and those where lightning strikes the ground near lines, generating an induced overvoltage on conductors.
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Increased penetration of Distributed Generation (DG) from solar and wind plants has created challenges for network operators when it comes to power quality issues such as voltage regulation, power factor and harmonics.
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Malaysia’s power system operates in a region of intense lightning activity that adversely impacts performance of certain lines, such as 132 kV Kuala Krai to Gua Musang line located in the northeast and the 500 kV Ayer Tawar to Bukit Tarek line which runs along the western coast of the Malay peninsula.
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American Transmission Company (ATC) own and operates transmission lines in the States of Wisconsin, Michigan, Minnesota and Illinois. The system originally belonged to local utilities that had different standards and this resulted in a variety of different line surge arrester installations at 69 kV and 138 kV.
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Application of gapped (EGLAs) or non-gapped (NGLAs) transmission line surge arresters (TLSAs) offers perhaps the best opportunity for power engineers to improve system reliability. However, as important as this may be, the value of using them transcends this one objective alone.
Read More Protection against overvoltages using gapless zinc oxide surge arresters has been accepted and adopted worldwide. In particular, assets such as transformers, cables and gas-insulated substations are highly vulnerable to transient surges from lightning and switching.
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Bushings are key components of HV substation equipment such as transformers and switchgear, allowing conductors to transfer energy from one insulating medium to another. Most typically, this is from an oil or SF6 insulation environment to air.
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Not long ago, a HV cable termination operating in a Mediterranean country experienced catastrophic failure, sending high velocity porcelain shards in all directions.
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