Frequency variable series resonant test systems are mainly used for on-site dielectric and diagnosis tests of capacitve line equipment as:
- GIS/GIL/Switchgear Arrangements
- Power Cables
- Power Transformers
Agea-kull series resonant test systems are of modular design with low weight components, especially designed for the requirements of on-site testing. Easy to handle and robust reactors with the possibility of series and parallel connection of more units allows an optimised adaptation of the system to the load capacitance
and enables testing of different kind of test objects with the same system.
No special equipment for transportation or erection is required, a small lorry and a low weight crane is enough.
In difference to other on-site test techniques as 0,1 Hz or DC, resonant test sets generate a voltage stress for the insulation similar to the service condition. This gives the test result more evidence and is nowadays the preferred on-site test method.
The systems cover a wide load range and test frequencies above 100 Hz prevent saturation of the instrument transformer cores. Therefore testing with installed instrument transformers and cable connections is possible.
Different kinds of partial discharge measurements like conventional method, non-conventional method with integrated sensors or UHF-method can be applied with frequency variable test systems.
The bar core reactors are oil impregnated and built-in a hermetical closed resign cylinder. Up to four units can be stacked to increase the output voltage of the system.
Besides the application as reactors for variable frequency series resonant test systems, they can be used to increase the load range of conventional test systems (partly compensation of the load capacitance at power frequency).
The converter works with an intermediate direct voltage circuit. The line voltage is rectified and stabilised. A following IGBT-bridge generates a square wave voltage of adjustable frequency between 15 Hz and 250 Hz. The converter generates only four switching impulses per cycle which do not disturb the PD-pattern or can be suppressed by gating.
Types of frequency converters available:
FUE 50 with 50 kVA power
FUE 100 with 100 kVA power
FUE 150 with 150 kVA power
The control unit is integrated in the frequency converter housing and enables automatic and manual operation of the system. An operator panel displays pre-selected and measured parameters.
The high voltage is measured by a built-in peak voltmeter in collaboration with a high voltage divider which is at the same time used as a base load and coupling capacitor.
Transport frames for easy and safe transportation of one or two reactor coils are available. The upper part of the frame is removable and the lower part can be used as a testing console.
| Type | Voltage kV |
max. Current A |
On-Duty min |
Inductance H |
Frequency Range Hz |
Load Range nF |
Diameter x Height mm |
Weight kg |
| DSH 0W | 220 | 6.4 | 10 | 50 | 110-250 | 8 – 42 | 800 x 775 |
420 |
| DSH 1W | 230 | 5.4 | 20 | 75 | 90-250 | 6 – 42 | 830 x 965 |
530 |
| DSH 2W | 230 | 3.0 | 30 | 200 | 60-250 | 2 – 35 | 880 x 1065 |
750 |
| DSH 3W | 200 | 2.5 | 180 | 200 | 63-250 | 2 – 32 | 940 x 1072 |
960 |
| DSH 4W | 250 | 4.0 | 30 | 200 | 50-250 | 2 – 51 | 930 x 1220 |
1200 |
| DSH 5W | 260 | 10.0 | 25 | 80 | 50-250 | 5 – 126 | 1120 x 1500 |
1900 |
| DSH 6W | 280 | 5.9 | 90 | 360 | 21-250 | 1 – 159 | 1350 x 1900 |
3300 |
| DSH 7W | 280 | 12.0 | 60 | 190 | 20-250 | 2 – 333 | 1600 x 1900 |
5000 |
Other voltages, currents, duties and inductance on request!
