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Manufacturer: SKB
Model: POKER-2
Origin: Russia
PKR-2 is intended for in-place maintenance check of all type (both resistor and reactor type) on-load tap changers (hereinafter – OLTCs) being a part of and not included in a power transformer.
The instrument is completed with a special transducer. Its interface with shafts of different drives is provided with a set of axes and bushings, which are installed without any tools by simply putting on the shaft extension.
Based on the selector and contactor switching sequence circular diagram in case of forward and reversal travel, one may judge on the end play size and selector assembly quality.
All characteristics are taken simultaneously based on three phases for OLTCs located in the neutral conductor of "star-connected" windings, and single phase for OLTCs located in the line of "star-" or "delta-connected windings".
The switchover oscillography enables to detect the actuation delay, non-simultaneity of in phase actuation and bouncing during switchover.
All characteristics are taken simultaneously based on three phases for OLTCs located in the neutral conductor of "star-connected" windings, and single phase for OLTCs located in the line of "star-" or "delta-connected windings".
Check conducted during the drive shaft slow rotation using a handle with simultaneous display of contact closures/openings in degrees and voltage and current values.
No additional elements (for example, resistors) or knowledge of resistances of current-limiting resistors of the checked instrument are required to measure the OLTC parameters. All adjustments to a specific OLTC are performed automatically in the instrument.
The instrument is completed with special long calipers to be conveniently connected to some OLTCs (in this case, it is not necessary to drain oil from the contactor tank).
The instrument may be connected to the on-load tap changer with measuring cables provided with alligator clips without contact calipers with oil being partially drained from the contactor tank or removal of the on-load tap changer from the transformer tank.
The instrument is equipped with a large color high-brightness and high-contrast display facilitating the graph processing.
The measurement results are stored in the non-volatile memory of the instrument, on the external flesh memory, and they may be transferred to the computer.
Therefore, the instrument may be controlled by the PC. It enables to measure diagrams being inside a car with the computer, which is important in winter.
The instrument meets the electromagnetic compatibility requirements to Class A equipment according to GOST R 51522.1-2011.
The instrument meets the safety requirements to electric control and measuring instruments and laboratory equipment according to GOST R52319-2005.
| PKR | PKR-2M | |
| OLTC check mode | demountable | demountable and in-place * |
| Inbuilt battery supply | none | available (operation time from 2 to 16 h) |
* In-place check mode enables to conduct the in-place diagnostics of OLTCs with current-limiting resistors with the contactor tank cover in place. This mode is based on the DRM method (see above) and consists in measurement of current intensity through winding, in which the OLTC is switched on.
|
Specifications |
Value |
|
Time interval measuring range, sec |
0.01 ÷ 1200 |
|
Maximum permissible intrinsic absolute error of time interval measurement, sec |
±(3+tx)×10-4 |
|
Time interval measurement resolution ability, ms |
±0.1 |
|
Angular movement measuring range, degrees |
2 ÷ 360 |
|
Maximum permissible intrinsic absolute error of angular movement measurement, degrees |
±0.56 |
|
Direct current intensity measuring range, А |
1 ÷ 4 |
|
Maximum permissible intrinsic relative error of direct current intensity measurement, % |
±2 |
|
Direct current electric voltage measuring range, V |
1 ÷ 20 |
|
Maximum permissible intrinsic relative error of direct current electric voltage measurement, % |
±5 |
|
Direct current electric voltage measurement range, Ohm |
1 ÷ 20 |
|
Maximum permissible intrinsic relative error of direct current electric resistance, % |
±5 |
|
Resistance measurement sampling rate per channel, kHz |
10 ±0.1 |
|
Maximum recording time (radial diagram measurement), min |
20 |
|
Number of computer communication channels, pcs. |
2 (USB, USB host) |
|
Maximum consumed power in start standby mode, W |
15 |
|
Maximum consumed power in measurement mode, W |
210 |
|
Operation temperature range, ºС |
-20 ÷ +50 |
|
Maximum measuring unit weight, kg |
6.1 |
|
Dimensions, mm |
360×290×165 |
|
Interface language |
English |
|
User manuals language |
English |
|
Calibration period, year |
3 |
| Photo | Item, Index | Application |
|---|---|---|
 |
PKR-2 measuring unit SKB035.00.00.000 | Instrument and accompanying documents: calibration certificate, operation manual, record book, measurement procedure, software (SW) for PC. |
 |
Measuring cable (3 pcs.) completed with a connector SKB035.24.00.000 | For transformer connection to the OLTC contacts. |
 |
Angular movement transducer DP22 SKB035.26.00.000 | The transducer enables to measure the angle and speed of the OLTC shaft rotation (complete with data sheet and calibration certificate). Angle measuring range – 0 - 360º (it is necessary to select the appropriate axis from the additional complete set). |
 |
Ground clamp SKB035.30.00.000 | To fix the DP22 transducer on the OLTC drive. |
 |
Handle SKB028.25.02.000 | To fix the magnetic clamp. Handle for the OLTC shaft rotation. It is used together with axes from the additional complete set. |
 |
Mains cable SKB018.09.00.000 | For connecting the instrument to the power line. Temperature range -15 ÷ +45 ºС (length – 1.5 m). |
 |
Ground wire SKB010.01.00.000 | For instrument case grounding. Equipped with a ground clamp and screw end cap. Rated current – 50А (length – 1.8 m). |
 |
Axis No. 10 together with a bushing SKB035.25.00.000 | Axis No. 10 is intended for the OLTC drives of MZ-4.1; M3.2; M3-4 types. It is used for the drive PDP-4U together with bushing SKB035.25.05.000. |
 |
VP2B-1V-2А cut-out (2 pcs.) | For power source protection. |
 |
Cable and ancillary equipment carrying case SKB126.06.00.000 |
| Photo | Item, Index | Application |
|---|---|---|
 |
Contact caliper set in a special case | Contact calipers (7 pcs.) for connection to the OLTC contacts without oil discharge. They are supplied in the convenient lockable carrying case. |
 |
USB 2.0 A-B cable | For the instrument connection to PC (length – 1.8 m). |
 |
Axis No. 1 SKB035.25.01.000 | For OLTC drives of BUL type. |
 |
Axis No. 2 SKB035.25.02.000 | For OLTC drives of PDP; МА-1; МAK-1 types. |
 |
Axis No. 3 SKB035.25.03.000 | For OLTC drives of PDP; МА-1; MAK-1 types. |
 |
Axis No. 4 SKB035.25.04.000 | For OLTC drives of PDP; МА-1; MAK-1 types. |
 |
Axis No. 6 SKB035.25.06.000 | For OLTC drives of PDP-4U type (when a manual drive is used). |
 |
Axis No. 9 SKB035.25.09.000 | For OLTC drives of PDP-4U type (when an electric drive is used). |
 |
Axis No. 7 SKB035.25.07.000 | For OLTC drives of MZ-4.1, MZ-4.4 types (when the electric drive is used). |
 |
Axis No. 8 SKB035.25.08.000 | For OLTC drives of MZ-4.1, MZ-4.4 types (when the manual drive is used). |
 |
Axis No. 11 SKB035.25.11.000 | For OLTC drives of SMA-7 (SMS-China), ED 100/200 S, ED 100/200 S types (MR-Germany) (when the manual drive is used). |
 |
Axis No. 12 SKB035.25.12.000 | For OLTC drives of SMA-7 (SMS-China), ED 100/200 S, ED 100/200 S types (MR-Germany) (when the electric drive is used). |
 |
Axis No. 13 SKB035.25.13.000 | For OLTC drives of VAKUTAP type manufactured by MR. |
