Overview
The YH series 0.28kV~51kV composite jacket AC gapless metal oxide lightning arrester is an important protective electrical device used to protect transmission and transformation equipment in 0.22kV~35kV AC power systems from lightning and operational overvoltage damage.

Model Description and Structure


Model meaning
Product Type: Y-Ceramic Coat Metal Oxide Surge Arrester; YH composite jacket metal oxide lightning arrester. Nominal discharge current: Refers to the nominal discharge current of metal oxide surge arresters, measured in kA
Structural features: W-gapless; C - There is a series gap; B - Places with parallel gap usage: S - Used for power distribution; Z - Used for power stations; R - Used to protect capacitor banks; D - Used for motors
Note: For low voltage systems, rotating motors, transformers, lightning arresters for motor neutral point protection, and those with neutral point directly grounded
Lightning arresters are not indicated. Characteristic number: It consists of two parts. Above the diagonal line is the rated voltage of the lightning arrester, measured in kV, and below the diagonal line is the residual voltage at the nominal discharge current of the lightning arrester, measured in kV. For a three-phase combination lightning arrester, the characteristic number consists of two sets of characteristic numbers. The first set is the phase ground characteristic number, and the second set is the phase phase characteristic number. The two sets of characteristic numbers are connected by an "X". If two sets of characteristic numbers are the same, they are represented by "characteristic number x 2".
Additional features: G-plateau type; W - anti fouling type; K - Seismic type.
Operating conditions
1. Normal operating conditions
Installation location: indoor or outdoor;
Environmental temperature: -40~+40 ℃;
Altitude not exceeding 1000m;
Frequency of AC power supply: 48~62Hz;
The power frequency voltage applied between the terminals of the lightning arrester for a long time shall not exceed its continuous operating voltage;
Areas with seismic intensity of 7 degrees or below.
2. Abnormal operating conditions
Except for the operating conditions in section 3.1, which are all abnormal operating conditions, the use of lightning arresters must be negotiated between the supply and demand parties.
Product Features
Excellent protection performance
Due to the use of metal oxide resistors with excellent nonlinear volt ampere characteristics, the protection margins for steep wave impulse residual voltage, lightning impulse residual voltage, and operational impulse residual voltage are almost the same, making the insulation coordination of the system more reasonable and the protection performance more excellent;
Strong flow capacity
Due to the use of resistors with high current carrying capacity, their 2ms square wave, 4/10 μ s high current, and power frequency overvoltage tolerance are greatly enhanced, and their energy absorption capacity is correspondingly improved,
Thereby improving the reliability of protection;
Good sealing performance
Due to the use of integral molding technology for the composite jacket and the absence of air gaps in the main body of the lightning arrester, the impact of external environment on its operation is fundamentally solved; Excellent stain resistance and aging resistance
Due to the use of a composite jacket with strong hydrophobicity and excellent weather resistance, as well as a resistor with stable long-term aging performance, the arrester has strong anti pollution and anti-aging capabilities
And it has improved its long-term operational reliability.
Specifications and main technical parameters
The performance of the 0.28kV~51kV composite jacket AC gapless metal oxide lightning arrester meets the requirements of IEC 60099-4 "AC gapless metal oxide lightning arrester", GB11032-2000 "AC gapless metal oxide lightning arrester", JB/T8952-1999 "Composite jacket gapless metal oxide lightning arrester for 35kV and below AC systems" and other standards. The specifications and main technical parameters of the lightning arrester are shown in Tables 1 to 5.

Table 1 Main technical parameters of 0.28kV~0.5kV low-voltage distribution lightning arrester





Table 2 Main technical parameters of 5kV~17kV distribution type lightning arrester




Main technical parameters of 3 5kV~51kV power station type lightning arrester





Table 4 Main technical parameters of 4kV~25kV motor type lightning arrester




Table 5 Main technical parameters of 5kV~51kV parallel capacitor type lightning arrester



*If there are higher requirements, they shall be negotiated by both the supply and demand parties.  



Three phase combined composite jacket metal oxide surge arrester for 3-35kV AC system

Overview
The three-phase combined composite jacket metal oxide lightning arrester used in 3-35kV AC systems is suitable for the overvoltage between phases and between phases and ground caused by frequent operation in 3-35kV power systems, to protect transmission and transformation equipment from damage caused by operating voltage.
There are two types of products: those without gaps and those with series gaps.
The development of three-phase combined overvoltage protectors has changed with the development of single lightning arrester technology. Introduced to China by Sweden in 1976. At that time, silicon carbide valve plates were used in series with gaps in lightning arresters, and combined lightning arresters were also made of silicon carbide valve plates in series with gaps. This type of lightning arrester has the following drawbacks:
1. High discharge dispersion;
2. Poor volt ampere characteristics and high impact coefficient;
3. There is an issue of arc extinguishing.
In 1983, China introduced advanced manufacturing technology for zinc oxide lightning arresters from abroad, and the manufacturing level of zinc oxide valve plates has reached the international advanced level. The zinc oxide valve plate has excellent non neutral line performance, aging resistance, and thermal stability. The gapless zinc oxide arrester has replaced the series gap silicon carbide arrester, and the corresponding gapless combined arrester has also developed into the gapless combined zinc oxide arrester. The gapless three-phase combined zinc oxide arrester is the best product for phase to phase and phase to ground overvoltage protection. It is recommended that users choose a three-phase combined ground gap zinc oxide lightning arrester.
Product Features
protection method
Due to the use of four element star connections, it can simultaneously protect against phase to phase and phase to ground overvoltage, and one can function as three phase to phase and three phase to ground lightning arresters.
Excellent protection performance
Due to the use of metal oxide resistors with excellent nonlinear volt ampere characteristics, the protection margins for steep wave impulse residual voltage, lightning impulse residual voltage, and operational impulse residual voltage are nearly consistent, making the insulation coordination of the system more reasonable.
Specification and main technical parameters of lightning arrester
The performance of the three-phase composite jacket gapless metal oxide lightning arrester fully meets the requirements of GB11032-2000 "AC gapless metal oxide lightning arrester" standard. The specifications and main technical parameters of the lightning arrester are shown in Table 6.
The performance of the three-phase composite jacket with series gap oxide lightning arrester meets the standards of GB11032-2000 and ZBK49005-90.
The specifications and main technical parameters of the lightning arrester are shown in Table 7.
Table 6 Three phase combined composite jacket gapless metal oxide lightning arrester



continued table



Table 7 Three phase combination composite outer jacket with series gap metal oxide lightning arrester



continued table



Note: Parameters marked with * indicate the rated voltage of the motor.

YH series 0.28kV~51kV composite jacket AC gapless metal oxide lightning arrester