Phạm vi khoảng thời gian đo, sec: 0.01 ÷ 1200
Sai số, sec: ±(3+tx)×10-4
Độ phân giải thời gian, ms: ±0.1
Dải đo chuyển động góc, độ: 2 ÷ 360
Sai số góc, Độ: ±0.56
Dải đo dòng điện trực tiếp, А: 1 ÷ 4
Sai số đo dòng điện, % ±2
Dải đo điện áp trực tiếp, V: 1 ÷ 20
Sai số đo điện áp, % ±5
Dải đo điện trở, Ohm: 1 ÷ 20
Sai số, % ±5
Tốc độ lấy mẫu đo trở kháng mỗi kênh, kHz: 10 ±0.1
Thời gian ghi max(radial diagram measurement) , phút ,:20
Thời gian ghi max (oscillography using the DRM method), min 20
Số kênh giao tiếp máy tính, pcs:2 (USB, USB host)
Thời gian hoạt động của pin, h: 2 ÷ 16
Thời gian sạc pin, h 2.5
Công suất tiêu thụ ở chế độ chờ, W: 15
Công suất tiêu thụ ở chế độ đo lường, W: 210
Dải nhiệt độ hoạt động, ºС: -20 ÷ +50
Trọng lượng, kg: 6.1
Kích thước, mm:360×290×165
Giao diện: English
HDSD: English
Chu kỳ hiệu chuẩn: 3 năm
Cung cấp kèm theo:
- Máy chính, HDSD
- Đầu do dịch chuyển góc DP22
- Kẹp đất
- Tay quay
- Dây nối đất
- Dây nguồn
- Bộ dây đo lường
- Túi đựng
Cataloge
OLTC maintenance check
PKR-2М is intended for mountable maintenance check of all type (both resistor and reactor type) on-load tap changers (hereinafter – OLTCs), as well as for in-place check, which enables to diagnose OLTCs with current-limiting resistors without removing the contactor tank cover.
OLTC in-place check mode (DRM method)
OLTC in-place check enables to conduct express diagnostics of the OLTC technical condition without opening the tank or OLTC removing. This check enables to obtain the contactor switchover diagrams for a wide range of switching devices (except reactor type ones) and conduct the OLTC condition evaluation based on the obtained diagrams, that gives the reasons to denote a defect nature and grounds for decisions related to repair of these on-load tap changers.
For example, for type RS, RNOA, etc., on-load tap changers the correctness of operation of the main and arcing contactor contacts, their condition (burned or not burned contact), current-limiting resistor integrity may be determined. For type RNTA – 35/320 on-load tap changers and in the analogous on-load tap changers, in which the contactor and selector are changed for a fine control circuit breaker, the main and arcing contacts, current-limiting resistor condition, as well as condition of surface of all fixed contacts of the circuit breaker, through which the moving contacts move, may be checked.
The application of in-place check mode based on the DRM method does not require:
- Opening of the tank or hatch of the fault-free/faulty OLTC and oil drain;
- Additional money and labor costs for the OLTC diagnostics;
- Connection of additional elements or knowledge of resistances of current-limiting resistors of the checked on-load tap changer, since all fine adjustments to a certain OLTC are conducted automatically in the instrument.
Radial diagram measurement of the resistor and reactor type OLTCs
The instrument is completed with a special transducer for the radial diagram measurement. 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.
All characteristics are measured 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".
Resistor type OLTC contactor switchover oscillography
The switchover oscillography enables to detect the actuation delay, non-simultaneity of in phase actuation and bouncing during switchover.
All characteristics are measured simultaneously based on three phases for the OLTCs located in the neutral conductor of "star-connected" windings, and single phase for the OLTCs located in the line of "star-" or "delta-connected windings".
OLTC check in static mode
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.
Automatic self-adjustment to OLTC
No additional elements (for example, resistors) or knowledge of resistances of current-limiting resistors of the checked on-load tap changer are required to measure the OLTC parameters. All adjustments to a specific OLTC are performed automatically in the instrument.
Ergonomic calipers or alligator clip cable
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.
Self-contained power supply, storage, transfer and analysis of measurement results in the instrument and PC
PKR-2М is equipped with inbuilt battery, which makes it more mobile and easy to use. The inbuilt battery enables to use the instrument during the entire workday without recharge on the vast territory of substation or workshop, which does not require the use of the power supply cable, mains socket extension cord and grounding.
The instrument is equipped with a large color high-brightness and high-contrast display facilitating the graph processing to present information in graphical or tabular form.
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 ins
The instrument is represented in two modifications
| |
PKR-2 |
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 the winding, in which the OLTC is switched on.
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Specifications
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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
|
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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
|
|
Maximum recording time (oscillography using the DRM method), min
|
20
|
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Number of computer communication channels, pcs.
|
2 (USB, USB host)
|
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Time of inbuilt battery operation in mixed mode (operation/standby), h
|
2 ÷ 16
|
|
Battery charge time from complete discharge till complete charge, h
|
2.5
|
|
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
|
Additional complete set (on order)
| Photo |
Item, Index |
Application |
 |
DRM test lead (3 pcs.) SKB035.28.00.000 |
To be used together with the standard СКБ035.24.00.000 test lead at non-destructive diagnosis (DRM-method) for connection to transformer and to auto transformer terminals above 200 kV. |
 |
A short-circuit cable SKB035.31.00.000 |
For in-place check of the transformer OLTCs (DRM-test).
Secondary circuit shorting. To be used for LTCs of power transformers and auto transformers (12 m). |
 |
Short-circuiting cable with ground clamp SKB032.13.00.000-01/-02 |
For in-place check of the transformer OLTCs (DRM-test).
Secondary circuit shorting - G75 (ground clamp jaw opening – 70 mm) and G100 (ground clamp jaw opening – 85 mm) at option. In standard complete set - G50 (ground clamp jaw opening – 45 mm). |
 |
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. |
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