Features of High Voltage Arrester
- The resistance value changes sharply with the voltage, which achieves automatic protection.
- The structure is simple and reliable, with a fast response speed and no maintenance required.
- It can withstand and discharge huge lightning currents or operational overcurrent energy multiple times.
- It can instantly restore the high-resistance insulation state without affecting the continuous operation of the system.
- There are models suitable for different voltage levels, installation environments and protected objects.
Your Reliable High Voltage Arrester Supplier
The ZHONGSHAO high voltage arrester is connected between the power system and the ground, which effectively protects the power system, transformers and your equipment from harmful instantaneous overvoltages, and can automatically and quickly return to a high-resistance state to ensure the normal operation of your system.
ZHONGSHAO is a professional supplier of grounding switches, providing you with one-on-one solutions. If you have any other questions about ZHONGSHAO’s power system solutions, please feel free to contact us at any time for professional advice.
Our arrester quickly absorbs and diverts excessive voltage to prevent damage for extending electrical service life.
Featuring fast response and high energy absorption, it ensures reliable protection for power distribution networks.
This arrester protects transformers, switchgear, and other equipment from lightning and surge overvoltage.
It absorbs and diverts excessive voltage, protecting transformers for long-lasting performance.
This detachable design enables easy installation and inspection, providing fast and reliable protection for transformers.
Has a low residual voltage and a fast response time, helping maintain system stability and extend the lifespan.
Its durable and fast response time make it suitable for power networks, substation, and distribution systems.
This protects power distribution components from lightning strikes and transient overvoltage.
What is a High Voltage Arrester?
The core function of a high voltage lightning arrester is to protect your lines and equipment from overvoltage or lightning strike damage.
When the system is operating normally, it shows high resistance and is almost non-conductive. Once a dangerous overvoltage occurs, it instantly turns into a low resistance, which discharges the huge inrush current to ground and limits the voltage your equipment is subjected to within a safe range. After the overvoltage disappears, it can automatically return to a high-resistance state, ensuring the continuous operation of the power grid.
It features no gap, fast response and good protection performance, which is an indispensable device in key links such as substations and transmission lines.
The Working Principle of High Voltage Arresters
When the power grid is operating normally, the lightning arrester is in a state of high resistance. The current flowing through at this time hardly affects the operation of the system.
When lightning or operational overvoltage strikes, its resistance drops sharply in an extremely short period of time, establishing a low-impedance grounding channel for the overvoltage energy and discharging the inrush current to the ground. At the same time, it limits the residual voltage on your equipment terminals to a safe level to protect the insulation of the equipment.
When the impact energy is completely released, the system voltage will return to normal. At this point, its resistance value will automatically and rapidly return to the initial high-resistance state. The entire process does not require mechanical action or arc extinguishing. It fully automatically completes the reset, ensuring that your power system can resume normal operation immediately after the protection action.
Characteristics of ZHONGSHAO High Voltage Arresters
High Sensitivity
Under normal system voltage, the high voltage lightning arrester exhibits extremely high resistance and conducts almost no electricity. Once the voltage exceeds a specific threshold, its resistance value will drop sharply and it will become highly conductive. This enables it to switch automatically and precisely between insulators and conductors, achieving protective functions.
Gapless Design
The high voltage lightning arrester has a simple, compact and reliable structure. It eliminates the influence of gap discharge dispersion and dirt, and has a faster response speed, which achieves an overall seal and is free from your maintenance.
Excellent Protection and Current-Carrying Capacity
Our high voltage lightning arresters feature excellent protection performance. When discharging amplified current, the voltage across them is very low, which provides your equipment with more sufficient insulation. Meanwhile, it can withstand and discharge the huge energy of lightning or operate overcurrent multiple times without damaging itself, ensuring reliable operation and long service life under harsh conditions.
Rapid Response Capability
High voltage lightning arresters have an extremely fast response speed to overvoltage and can act quickly before insulation is damaged. In addition, when the overvoltage disappears, it can automatically and instantaneously return to a high-resistance insulation state, cutting off the subsequent power frequency continuation current and avoiding the possible line tripping caused by traditional lightning arresters.
Wide Applicability
High voltage lightning arresters have a series of products for different voltage levels, installation environments and protected objects, with extremely wide applicability. Meanwhile, it is usually equipped with an online monitor interface, which can monitor its leakage current or the number of actions in real time, providing data support for its condition assessment and your preventive maintenance.
The Function of High Voltage Arresters
Limit Overvoltage
When dangerous transient overvoltage occurs in the power system due to lightning strikes, switch operations or faults, our high voltage lightning arresters will immediately discharge the energy of the overvoltage into the ground through themselves, and at the same time limit the peak overvoltage applied to the terminals of the protected electrical equipment below a pre-set safety value, thus ensuring that the main insulation of your equipment is not damaged.
Discharge the Inrush Current
Whether it is the lightning current generated by lightning or the current produced by operating overvoltage, our high voltage lightning arresters can safely direct these instantaneous energies into the ground, preventing energy accumulation on equipment or lines, and thus avoiding damage to your equipment or system failure due to the inability to release energy.
Maintain Continuous Operation of the System
After discharging the inrush current, our high voltage lightning arrester can immediately return to a high-resistance insulation state and will not generate continuous power frequency short-circuit current. Therefore, it will not cause the circuit breaker of the line to trip, which enhances the reliability and stability of the power grid supply.
The Application of High Voltage Arresters
Substations and Power Plants
In substations and power plants, high voltage lightning arresters are usually installed at key locations such as busbars, transformers, switchgear, and generators. Its main function is to prevent lightning waves from invading the transmission lines from damaging the expensive equipment within the station, and at the same time protect against internal overvoltage generated by switch operations within the station.
Transmission Line Protection
Lightning arresters are directly installed on overhead transmission lines and are usually connected in series and parallel with insulators. When struck by lightning, the lightning arrester can prioritize discharging the lightning current into the ground, which effectively prevents the line from tripping. For areas frequently struck by lightning and important power transmission channels, it can significantly reduce the rate of lightning tripping and enhance the reliability of power supply.
Special Equipment Protection
Parallel capacitor banks are prone to generating operating overvoltages with very high amplitudes, and high-voltage lightning arresters can provide precise protection. Reactors, motors, GIS, etc. need to be equipped with lightning arresters that match their insulation structures and operational characteristics. In addition, the converter valves in DC transmission systems also rely on lightning arresters with special performance for protection.
The selection of the rated voltage must be higher than the temporary power frequency overvoltage that may occur in the system. Under-selection may lead to thermal collapse and damage of the lightning arrester when the system is abnormal, while over-selection will cause its protection level to deteriorate, endangering the insulation of the equipment.
When you carry out the renovation, you need to pay special attention to the compatibility of the installation dimensions, the connection between the rated voltage and the protection level, as well as the effectiveness assessment of the original grounding system.
This is usually an early sign of valve plate aging or internal moisture. Although it may not affect the protective function in the short term, you need to enhance monitoring and shorten the test cycle, and arrange for power outage inspection or preventive replacement at an appropriate time.
You can adopt valve plates with a larger flow capacity and optional explosion-proof and anti-disengagement structures. It is also recommended to shorten the preventive test cycle to form all-round enhanced protection.
Under normal working conditions and regular monitoring, its expected service life can reach 10 to 20 years, and its high reliability has passed multiple certifications.
