China Zhenglan Cable Technology Co., Ltd Company News

10kV high-voltage switchgear includes: 10kV high-voltage outgoing switchgear, 10kV high-voltage incoming switchgear, 10kV high-voltage ring main unit, PT cabinet, and metering cabinet. The terms "incoming switchgear" and "outgoing switchgear" differ by only one character; their differences and functions are significant. Incoming switchgear – This is the switchgear that receives power from an external source. Generally, it receives 10kV power from the power grid. This 10kV power is then transmitted to the 10kV busbar through the switchgear; this switchgear is the incoming switchgear. In substations with voltage levels of 35-110kV and above, the incoming switchgear refers to the transformer's low-voltage (10kV) switchgear. That is, the first cabinet connecting the low-voltage output of the transformer to the initial terminal of the 10kV busbar is called the incoming switchgear, also known as the transformer's low-voltage incoming switchgear. The incoming line switchgear is the main switchgear on the load side. This switchgear bears the current carried by the entire busbar. Because it connects the main transformer to the low-voltage side load output, its role is crucial. In terms of relay protection, when a fault occurs on the low-voltage side busbar or circuit breaker of the main transformer, the overcurrent protection on the low-voltage side of the transformer trips the incoming line switchgear to clear the fault. A fault on the low-voltage side busbar also relies on the backup protection on the low-voltage side of the main transformer to clear the incoming line switchgear. The transformer differential protection also clears the low-voltage side circuit breaker, i.e., the incoming line switchgear. In a 110kV substation, the switch parameters for the low-voltage incoming line switchgear differ from those of other switchgear. Its rated current is 3150A～4000A, and its rated breaking current is 31.5～40kA. The parameters of the 10kV bus tie switchgear are the same as those of the incoming line switchgear. Outgoing line switchgear—this is the switchgear that distributes electrical energy from the busbar. Power is transmitted from the 10kV busbar to the power transformer via a switchgear; this switchgear is one of the 10kV outgoing switchgear units. An outgoing switchgear is installed on the low-voltage side of the transformer, transmitting power through this switchgear to the low-voltage busbar. Several other low-voltage switchgear units are then installed on the low-voltage side to distribute power to various points of use. These low-voltage switchgear units are all outgoing switchgear units. If a low-voltage system is introduced from nearby, the low-voltage switchgear connected to the incoming line is also an incoming switchgear unit, only at a lower voltage. Switchgear units extending from the low-voltage busbar are also outgoing switchgear units. Therefore, incoming switchgear units can be high-voltage or low-voltage, and similarly, outgoing switchgear units can be high-voltage or low-voltage.

Dear Customers Thank you so much for your accopmay in the past days. Here comes the new year 2026. We sincerely send you our greetings. Hope you and your family peaceful, happy, healthy. Hope you will have more progess in your work or business. Happy new year!! We will be on a 3-day legal holiday from January 1st to 3rd. During holiday we may have limit access to email. If you have any inquiry, we will get back to you once resume work.  Zhenglan Cable Technology Co., Ltd 2025.12.31

Different countries have their own cable nomenclature, generally with a combination of alphanumeric descriptions which together build up a designation which clearly defines the voltage rating and materials employed. Below are Medium Voltage cables esignation  in Portugal. X Copper Conductor LX  Aluminium Conductor HI Metallic Screen - Copper Tape HIO Metallic Screen - Copper Wires  R Steel wire armour (for multi-core cables) A Steel tape armour (for multi-core cables) 1R / 1A Aluminium armour/aluminum tape armour (for single core cables) L Longitudinal waterblocking tape XS 3x1 core with messenger wire with XLPE sheath E Polyethylene (PE) Outer Sheath V Polyvinyl Chloride (PVC) Outer Sheath Z1 Polyolefin Outer Sheath DMZ1 or DMZ2 for Low Smoke Halogen-free cables  (ce) Longitudinal water tightness in conductor (be) Longitudinal water tightness in metallic screen (cbe) Longitudinal water tightness in conductor and metallic screen flr Minimum CPR Classification Eca frt Minimum CPR classification Cca s1b, d1, a1

Irradiation cross-linking, also known as electron beam cross-linking, involves using high-energy electron beams generated by electron accelerators to break and rebuild the molecular bonds within the insulation and sheath layers of cables. When high-energy electron beams penetrate materials such as polyolefins, they act like countless molecular scalpels, simultaneously cutting all the weak links in the original molecular chains and then re-welding them into a dense three-dimensional network structure. This process gives the raw materials unique properties such as temperature resistance, acid resistance, radiation resistance, high flame retardancy, and high toughness. Irradiation cross-linked flame-retardant wires and cables are primarily used in fire-sensitive areas such as homes, multi-story buildings, hotels, hospitals, subways, nuclear power plants, tunnels, power plants, mines, oil and chemical plants, as well as in power supply lines for emergency equipment such as fire alarm systems, security equipment, smoke exhaust systems, emergency escape routes, and lighting. The advantages of electron beam irradiation of cross-linked wires and cables include: 1. Irradiation cross-linked products offer high performance, energy efficiency, and zero pollution;2. Irradiation cross-linking is a method that can produce wires and cables that are both chemically cross-linked and flame-retardant.3. High temperature resistance. Irradiation cross-linked products can withstand temperatures of 105-150℃, while other chemical cross-linking methods are currently limited to 90℃, and PVC is only 70℃.4. Strong radiation resistance (good aging and thermal embrittlement resistance), and excellent crack resistance;5. Irradiation products are cross-linked at room temperature, preventing conductor annealing and defects caused by thermal stress during the production process, and avoiding thermal stress on the insulation layer. Future development trends show continuous progress in technological innovation for irradiated cables. For example, dynamic electron beam control technology, high-energy electron beam irradiation technology, and double-layer co-extrusion processes have not only further improved the durability and safety of wires but also made the production process more environmentally friendly. In the future, with continuous technological advancements, irradiated cables are expected to be applied in more fields, such as smart grids and efficient energy management systems, opening up broader market prospects.

The selection of grounding materials needs to be comprehensively judged based on the specific application scenario, environmental conditions, and regulatory requirements. Below are the applicable scenarios and key points for selection of different materials: 1.Copper-plated grounding rodAdvantages: Combining the conductivity of copper with the strength of steel, its corrosion resistance is superior to galvanized steel, and its lifespan can reach over 40 years, suitable for lightning protection grounding.  Applicable scenarios: Lightning protection grounding, highly corrosive soil environments. 2. Galvanized steel  wireAdvantages: Low cost, high strength, suitable for general soil environments.  Limitations: Prone to corrosion, lifespan approximately 10 years, requires regular maintenance (resistance measurement every 6 years, excavation inspection every 8 years). Applicable scenarios: Grounding projects in areas with limited budgets and non-highly corrosive areas. 3. Bare copper conductorAdvantages: Good conductivity, corrosion resistance, fast current discharge, high safety. Limitations: Expensive, easily stolen, requires care to prevent bending. 2. Applicable Scenarios: Lightning protection or anti-static grounding with high safety requirements (such as substations, precision equipment). 4. Insulated Copper WireAdvantages: Insulation layer protection, protection against electric shock, suitable for indoor or humid environments. Applicable Scenarios: Indoor lightning protection grounding, anti-static grounding (such as household appliances, computers).

A Comprehensive Analysis of Heavy-Duty Rubber-Sheathed Flexible Cables (YCW): Common Misconceptions and Correct Identification and Selection Methods 1. What is a YCW Cable? YCW cable stands for heavy-duty rubber-sheathed flexible cable. It is suitable for various mobile electrical equipment with AC rated voltage of 450/750V and below, and can withstand significant mechanical forces. This cable is frequently used in ports, mines, construction sites, and other similar environments. Different application scenarios require different cable types. 2. What are the common types of YCW cables?(1). Ordinary YCW Cable This is the most common type, suitable for general industrial environments. It has good insulation performance, high flexibility, and can operate normally in environments ranging from -20℃ to 60℃. Many factories use it for mobile equipment. (2). Oil-Resistant YCW Cable Some working environments contain oil, which can easily corrode ordinary cables. Oil-resistant YCW cables are superior; their insulation and sheath are made of special materials that resist oil corrosion, ensuring stable cable performance. They are used in oil-contaminated environments such as oil refineries and ships. (3). Cold-Resistant YCW Cables In cold regions, ordinary cables become hard and brittle, easily breaking. Cold-resistant YCW cables use cold-resistant rubber materials and can operate normally in temperatures as low as -40℃. They are essential for open-pit mines in northern regions and construction projects in cold areas. 3. Misconceptions about YCW Cables  (1). Thinking Thicker is Better Many people believe that thicker cables are better, but this is not the case. Cable thickness is related to current carrying capacity, but different scenarios have different current carrying capacity requirements. If used in low-power equipment, choosing a cable that is too thick is not only a waste of money but also takes up space. This misconception arises because people think thicker cables are safer; in reality, cable selection should be based on the equipment power and the operating environment. (2). Ignoring the Operating Environment Some people buy cables without considering the operating environment. For example, using ordinary cables in places with acid or alkali corrosion will quickly cause the cables to corrode and be damaged. This is because people do not realize the impact of the environment on cables and only focus on price and appearance. (3). Ignoring Quality Some people buy cheaper cables to save money. These cables are of poor quality, potentially with poor insulation and low conductor purity, easily leading to safety accidents. This is because they prioritize price over long-term safety and stability. 4. How to correctly identify and select YCW cables?  (1). Check the model and markings: The cable sheath has the model and markings, including specifications, rated voltage, and applicable range. Be sure to check carefully when buying to confirm it meets your requirements. (2). Observe the appearance: Good cables have a smooth appearance, uniform color, and no defects such as bubbles or cracks. The sheath and insulation layer are tightly bonded and not easily peeled off. (13). Consider the usage environment: Select cables according to the usage environment. For example, choose high-temperature resistant cables for high-temperature environments and moisture-proof cables for humid environments. 5. Summary  Understanding the types of YCW cables is crucial! Don't make those misconceptions; cable selection is not something to be taken lightly. Choose the right model and check the quality based on the actual situation. Only in this way can we avoid unfortunate incidents and ensure that cables protect our work and lives.