Compressed Gas Standard Capacitor
Scope
Gas insulated Standard Capacitors is an indispensable instrument in every modern high-voltage laboratory and widely applied to important test field.
The SF6 insulated standard capacitor is used as standard capacitor in measuring bridge Circuits to measure the dielectric loss Factor tanδ, Further-more, meanwhile used as high- voltage capacitive divider to measure the voltage of loop.
Huatai series standard capacitors can also be used as a high-voltage capacitive divider. This allows high accurate voltage measurements e.g. such as loss measurements on power transformer.
Huatai series standard capacitors have optimally design considering various capacitance measurement and dielectric loss factor tanδ measurement with series Qsxx electric bridge (or other kind instrument). However, the built-in protective electrode is still allowed to use the capacitor connected with the other old Schering bridges.
Standards:
JB/T 1811《High Voltage Standard Capacitor Evaluation》
GB311.1《Insulation of High Voltage Power Transmission》
GB/T 16927.1-1997《High Voltage Test Technology》
IEC60060-1《High Voltage Test Technology》
IEC60270 GB/ 7354 《Partial Discharge Test》
STIEA/JJF020-2005《High Voltage Measuring Bridge Calibration》
Technical specification
Elementary Diagram:
Mark:
0: Shielding
1: High voltage electrode
2: Test electrode
The following picture is the standard capacitor, and the right-side of picture is the plate capacitor, which shows the elementary diagram.
Technical parameter:
| Rated voltage | 200kV |
| Test voltage1.2 UN | 240kV |
| Rated capacitance C12 | 50pF&5pF |
| The error of capacitor C12 | ± 1% with Rated value |
| Accuracy of measuring capacitance C12 | ±0.05% |
| Rated partial discharge | ≤5pC |
| Rated frequency | 50Hz/60Hz |
| RatedSF6 pressure | 0.4Mpa±0.05Mpa |
| Temperature coefficient | <≤3×10-5/°C/td> |
| Pressure coefficient | ≤2.2×10-3/0.1Mpa |
| Dimension | See the layout drawing |
| Weight | Approx. 160kg |
Factory Test Item
| No. | Test Item | Test Method |
| 1 | Appearance Inspection | VisualInspection |
| 2 | Sealing Test | Apply 0.4MPa pressure,continuous 48 hours, pressure is no any change. |
| 3 | AC Withstanding Voltage Test | 1 minutes @ 1.2 Un |
| 4 | Insulation Resistance Test | Use Insulation tester to test Connector to Earth. |
| 5 | Capacitance and Tan Delta Test | Apply voltage to rated voltage, use additional standard capacitor to test and compare. |
| 6 | Partial Discharge Test | Apply voltage to rated voltage use PD detector to test. Standard: JB/T1811 |
Scope of Supply
| No. | Product | Type | Quantity |
| 1 | High Precision Standard Capacitor | Huatai | 1 |
| 2 | Shielding Ring | JU | 1 |
| 3 | User Manual | / | 1 |