The D78 Series MOV for Line Surge Arrester is a highly reliable surge protection device designed to protect electrical systems from power surges. It is a three-phase, single-stage MOV block that features robust construction and is specifically designed for installation in 750-1000kV line surge arresters. This series of MOV varistor blocks is designed with a high-speed response, providing a fast response time to protect against both transient and steady-state overvoltages. As a reliable mov selection for surge protection, the D78 Series surge arrester mov provides excellent protection for both indoor and outdoor applications, making it an ideal solution for high-voltage surge protection.
Type | D78H22.5 |
Nominal discharge current In kA | 20 |
Suggested rated voltage kV | 3.24 |
Diameter mm | 78±1 |
Height mm | 22.5±0.3 |
AVG Gradient V/mm | 205 |
DC U1mA kV | 4.61±0.30 |
Iref mA | 5 |
Uref kV | 3.26 |
Ures kV | 8.21±0.54 |
8/20uS repetitive charge transfer Qrs C | |
2ms repetitive charge transfer Qrs C | 3.6 |
2ms duration of rectangular impulse current A | 2000 |
4/10µs high current test kA | 100 |
Accelerated ageing test Kct | ≤ 1.0 |
Note:
The nouns, parameters and corresponding test methods in this parameter list conform to the standards of IEC60099-4:2014 and GB11032-2020.
The rated voltage, power frequency reference current and power frequency reference voltage are reference values.
The 2ms square wave tolerance value is based on the declared current/2ms repetitive charge transfer charge Qrs=423, if the actual test waveform 2ms current/2mS repetitive charge transfer charge Qrs is not equal to 423, it should be corrected according to the actual 2ms current waveform and Qrs value.
The charging rate of the aging test was 90%.
The number of pulses for the high current withstand value is two.
Type | D78H35.4 |
Nominal discharge current In kA | 10 |
Suggested rated voltage kV | 5.38 |
Diameter mm | 78±1 |
Height mm | 35.4±0.5 |
AVG Gradient V/mm | 215 |
DC U1mA kV | 7.61±0.40 |
Iref mA | 5 |
Uref kV | 5.38 |
Ures kV | 12.41±0.66 |
8/20uS repetitive charge transfer Qrs C | |
2ms repetitive charge transfer Qrs C | 3.6 |
2ms duration of rectangular impulse current A | 2000 |
4/10µs high current test kA | 100 |
Accelerated ageing test Kct | ≤ 1.0 |
Note:
The nouns, parameters and corresponding test methods in this parameter list conform to the standards of IEC60099-4:2014 and GB11032-2020.
The rated voltage, power frequency reference current and power frequency reference voltage are reference values.
The 2ms square wave tolerance value is based on the declared current/2ms repetitive charge transfer charge Qrs=423, if the actual test waveform 2ms current/2mS repetitive charge transfer charge Qrs is not equal to 423, it should be corrected according to the actual 2ms current waveform and Qrs value.
The charging rate of the aging test was 90%.
The number of pulses for the high current withstand value is two.
Type | D78H35.4B |
Nominal discharge current In kA | 10 |
Suggested rated voltage kV | 5.89 |
Diameter mm | 78±1 |
Height mm | 35.4±0.3 |
AVG Gradient V/mm | 235 |
DC U1mA kV | 8.32±0.40 |
Iref mA | 5 |
Uref kV | 5.91 |
Ures kV | 13.39±0.66 |
8/20uS repetitive charge transfer Qrs C | |
2ms repetitive charge transfer Qrs C | 3.6 |
2ms duration of rectangular impulse current A | 2000 |
4/10µs high current test kA | 100 |
Accelerated ageing test Kct | ≤ 1.0 |
Note:
The nouns, parameters and corresponding test methods in this parameter list conform to the standards of IEC60099-4:2014 and GB11032-2020.
The rated voltage, power frequency reference current and power frequency reference voltage are reference values.
The 2ms square wave tolerance value is based on the declared current/2ms repetitive charge transfer charge Qrs=423, if the actual test waveform 2ms current/2mS repetitive charge transfer charge Qrs is not equal to 423, it should be corrected according to the actual 2ms current waveform and Qrs value.
The charging rate of the aging test was 90%.
The number of pulses for the high current withstand value is two.
The D78 Series surge arrester mov is a reliable and efficient way to protect power lines from overvoltage and high-energy surges. This surge arrester mov block is designed for use in 750-1000kV line surge arresters, making it a perfect fit for a wide range of applications. It features advanced technology that ensures superior performance and reliability. With a slim design, the D78 Series MOV is easy to install and maintain. Contact metal oxide varistor manufacturer TGE for more mov blocks.
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