TRANSFORMER OLTC DIAGNOSTIC SYSTEM
1. Mode of non-demountable diagnostics (the DRM method) allows checking the technical condition of OLTCs with current-limiting resistors without removing the contactor tank cover. The mode is based on the DRM method and consists in measuring the current amplitude through the winding in which the OLTC is located. This diagnostic allows obtaining contactor switching oscillograms for a wide range of switching devices, except for the reactor type.
2. Osсillography of switching of resistor type OLTC contactor allows identifying delays in operation, non-simultaneous actuation of phases, bouncing at switching.
3. For recording of the circular diagrams, these devices are equipped with a special transducer. It can interface with shafts of various drives, provided by a set of axles and bushings, while their installation is carried out without the use of any tool by simply placing on the length of shaft protrusion.
4. Oscillography and circular diagrams are recorded for three phases simultaneously. Working with the instrument will not require any connection of additional elements; all adjustments to the particular OLTC are done automatically.
5. The measurement results are stored in the non-volatile memory of the instruments, or on an external Flash drive, or they can be transferred to a PC or laptop. To present information in graphical or tabular form, the devices are equipped with a large colour touch-screen.
6. For convenience of direct connection to the OLTC contacts (without using the DRM method), when there is a partial or full oil discharge, the instruments are fitted with special long probes.
| GENERAL FEATURES | |
| Measurement range of time | 0.01 – 1 200 sec |
| Accuracy | ± (3 + tx) x 10-4 sec |
| Resolution | ±0.1 ms |
| Measuring range of angular movement | 2˚ – 360˚ |
| Accuracy | ±0.56˚ |
| Measuring range of DC current | 1 – 4 A |
| Measuring range of DC electric voltage | 1 – 20 V |
| Measuring range of DC electrical resistance | 1 – 20 Ω |
| Accuracy | ±5 % |
| Sampling frequency of resistance measurement per channel | 10 ±0.1 kHz |
| Maximum circular diagram registration time | 20 min |
| Maximum DRM oscillogram registration time | 20 min |
| Power supply (built-in battery) of PKR-2M | Lithium-ion battery |
| Battery charging time of PKR-2M | 2.5 h |
| Battery runtime (in continuous operation) of PKR-2M | 2 – 8 h |
| PC connection | USB and USB host |
| Display | TFT color graphic touch, 640 x 480 pixels |
| Power consumption in standby mode | < 15 W |
| Power consumption in measurement mode | < 210 W |
| Power supply (mains voltage) | ~ 150-242 V, 47-63 Hz = 150-300 V |
| Dimensions | 360 × 290 × 165 mm |
| Weight of PKR-2 / PKR-2M | 5.1 / 6.1 kg |
| Environmental protection | IP 64 (device cover closed) IP 20 (device cover open) |
| Operating temperature range | from -20°C to +40°C |
| Warranty period | 3 years |
| Recommended сalibration interval | 3 years |
| Interface and user manual language | English |
| tx – measured time interval, s |
