No. | Specification | Dissipation | Withstanding voltage | Insulation resistance | Dimension (mm) |
---|---|---|---|---|---|
1 | 20kV-2000pF | ≦0.0040 | 1.5Ur● 1min | ≧1.0×105MΩ | D | H | L | D | M |
2 | 20kV-10000pF | 45 | 19 | 23 | 12 | 5 |
3 | 20kV-18000pF | 65 | 15 | 19 | 12 | 5 |
4 | 30kV-1000pF | 80 | 17 | 25 | 12 | 5 |
5 | 30kV-2700pF | 45 | 24 | 32 | 12 | 4 |
6 | 30kV-12000pF | 60 | 20 | 28 | 12 | 4 |
7 | 40kV-150pF | 20 | 33 | 41 | 8 | 4 |
8 | 40kV-500pF | 28 | 33 | 41 | 8 | 4 |
9 | 40kV-7500pF | 80 | 24 | 29 | 12 | 6 |
10 | 40kV-10000pF | 80 | 22 | 26 | 16 | 5 |
11 | 50kV-1000pF | 50 | 30 | 34 | 12 | 4 |
12 | 50kV-1000pF | 32 | 27 | 31 | 16 | 5 |
13 | 50kV-5600pF | 80 | 31 | 35 | 16 | 5 |
14 | 60kV-1500pF | 50 | 31 | 34 | 12 | 5 |
15 | 60kV-3000pF | 65 | 32 | 35 | 16 | 5 |
16 | 100kV-500pF | 50 | 54 | 58 | 12 | 5 |
17 | 100kV-2000pF | 51 | 32 | 35 | 16 | 5 |
18 | Insulator type 100kV-1500pF | 68 | 36 | 40 | 16 | 5 |
19 | 150kV-820pF | 65 | 95 | 100 | 12 | 5 |
20 | 200kV-600pF | 50 | 90 | 94 | 16 | 5 |
The cornerstone of measurement: the accuracy contribution of doorknob capacitors in capacitive voltage dividers.
Capacitive voltage dividers are core equipment for high-voltage measurements (power frequency, pulse, and lightning impulse). Their accuracy directly depends on the stability and linearity of the high-voltage arm capacitance. High-voltage doorknob capacitors utilize temperature-compensated ceramic dielectrics, offering a capacitance change rate of <±0.5% and a voltage coefficient deviation of ≤±0.2% within the temperature range of -40°C to +85°C, providing the voltage divider with long-term stability. For example, in 500kV series resonant test equipment, the voltage divider must maintain Class 0.2 accuracy (error ≤±0.2%) in the 150kV–300kV range. The low loss (tanδ ≤ 0.001) and high insulation resistance (≥10^5 MΩ) of doorknob capacitors effectively suppress measurement errors caused by DC leakage current and dielectric polarization.