Control instrument of OLTC transformers PKR-2

Certificates

  • Safety Test Certificate IEC 61010-1:2001
  • Russian State Register Certificates
  • Внесен в Госреестр Республики Казахстан
  • Внесен в Госреестр Республики Беларусь
  • Declaration of Conformity of the Customs Union
  • Russian Register of Innovative Products
  • Recommended for use in JSC Russian Railways electric installations
  • PJSC ROSSETI Register of Innovative Solutions

OLTC maintenance check

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Radial diagram measurement of the resistor and reactor type OLTCs

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Resistor type OLTC contactor switchover oscillography

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OLTC check in static mode

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Automatic self-adjustment to OLTC

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Ergonomic calipers or alligator clip cable

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Storage, transfer and analysis of measurement results

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High safety level during operation

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The instrument is represented in two modifications

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PKR-2 is intended for demountable diagnostics of OLTC all type (both resistor and reactor type) being a part of and not included in a power transformer. 

OLTC manufactures: MR, ABB, Hyundai Heavy Industries-Bulgaria.

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
IP for transportation IP64
IP rating in operating state IP20
Maximum measuring unit weight, kg 6.1
Dimensions, mm 360×290×165
Interface language English
User manuals language English
Calibration period, year 3

Standard complete set

Photo Item, Index Application
PKR-2 measuring unit
  • PKR-2 measuring unit
  • SKB035.00.00.000
  • 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 with a connector<br>A, B, C poles cables
  • Measuring cable with a connector
    A, B, C poles cables
  • SKB035.34.00.000
    SKB035.34.00.000-01
    SKB035.34.00.000-02
    SKB035.39.00.000
  • Measuring cable with a connector
    A, B, C poles cables
  • SKB035.34.00.000
    SKB035.34.00.000-01
    SKB035.34.00.000-02
    SKB035.39.00.000

Intrusive method of diagnosis. For connection to transformer LTC terminals inside the tank.

Angular movement transducer DP22
  • Angular movement transducer DP22
  • SKB035.26.00.000
  • 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
  • Ground clamp
  • SKB035.30.00.000
  • Ground clamp
  • SKB035.30.00.000

To fix the DP22 transducer on the OLTC drive.

Handle
  • Handle
  • SKB028.25.02.000
  • 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.

Axis No.10 together with a bushing
  • Axis No.10 together with a bushing
  • SKB035.25.00.000
    SKB028.25.01.008
  • Axis No.10 together with a bushing
  • SKB035.25.00.000
    SKB028.25.01.008

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.

Mains cable
  • Mains cable
  • SKB018.09.00.000
  • Mains cable
  • SKB018.09.00.000

For connecting the instrument to the power line. Temperature range -15 ÷ +45 ºС (length – 1.5 m).

Ground cable
  • Ground cable
  • SKB010.01.00.000
  • Ground cable
  • SKB010.01.00.000

For instrument case grounding. Equipped with a ground clamp and screw end cap. Rated current – 50А (length – 1.8 m).

VP2B-1V-2А cut-out (2 pcs.)
  • VP2B-1V-2А cut-out (2 pcs.)
  • VP2B-1V-2А cut-out (2 pcs.)

For power source protection.

Cable and ancillary equipment carrying case
  • Cable and ancillary equipment carrying case
  • SKB126.06.00.000
  • Cable and ancillary equipment carrying case
  • SKB126.06.00.000

Additional complete set (on order)

Photo Item, Index Application
Contact caliper set in a special case
  • Contact caliper set in a special case
  • SKB035.27.00.000
  • Contact caliper set in a special case
  • SKB035.27.00.000

Contact calipers (7 pcs.) for connection to the OLTC contacts without oil discharge. They are supplied in the convenient lockable carrying case.

Axises for setting a measuring sensor DP22 at the output shaft
  • Axises for setting a measuring sensor DP22 at the output shaft
  • Axises for setting a measuring sensor DP22 at the output shaft

Select the axis for setting a measuring sensor DP22 at the output shaft:

  • Axis No. 1 - for OLTC drives of BUL type (СКБ035.25.01.000);
  • Axis No. 2 - for OLTC drives of PDP; МА-1; МAK-1 types (СКБ035.25.02.000);
  • Axis No. 3 - for OLTC drives of PDP; МА-1; MAK-1 types (СКБ035.25.03.000);
  • Axis No. 4 - for OLTC drives of PDP; МА-1; MAK-1 types (СКБ035.25.04.000);
  • Axis No. 6 - for OLTC drives of PDP-4U type (when a manual drive is used) (СКБ035.25.06.000);
  • Axis No. 9 - for OLTC drives of PDP-4U type (when an electric drive is used) (СКБ035.25.09.000);
  • Axis No. 7 - for OLTC drives of MZ-4.1, MZ-4.4 types (when the electric drive is used) (СКБ035.25.07.000);
  • Axis No. 8 - for OLTC drives of MZ-4.1, MZ-4.4 types (when the manual drive is used) (СКБ035.25.08.000);
  • Axis No. 11 - 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) (СКБ035.25.11.000);
  • Axis No. 12 - 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) (СКБ035.25.12.000);
  • Axis No. 13 - for OLTC drives of VAKUTAP type manufactured by MR (СКБ035.25.13.000);

USB 2.0 A-B cable
  • USB 2.0 A-B cable
  • USB 2.0 A-B cable

For the instrument connection to PC (length – 1.8 m).

Manipulating rod
  • Manipulating rod
  • SKB110.41.00.000
    SKB110.41.00.000-01
    SKB110.41.00.000-02
  • Manipulating rod
  • SKB110.41.00.000
    SKB110.41.00.000-01
    SKB110.41.00.000-02

The rod is designed to ensure convenient connection to contacts of a transformer inputs.

The rod is completed with a clamp with current and potential contacts connected by wires with the measurement platform. Test cables are connected to the measurement platform from the ground.

Control instrument of OLTC transformers PKR-2
  • Open Original

    Irkutsk State Technical University

    In the period between August 9-11 the Research Laboratory for Electric Equipment Testing of the Irkutsk State Technical University performed diagnosis of a block-type TDTNG 75000/110 transformer at a thermal power plant TPP-9 of OJSC Irkutskenergo using your instruments. Resistances of transformer windings were measured using the MIKO-8 microohmmeter. Circular diagrams of LTC transformer were obtained using PKR-2 instrument.

    It should be noted that the instruments are of high quality, they are compact and have a number of advantages over similar instruments of other firms (particularly, user-friendly interface, ability to review curves of the instrument signal on site).

    On the whole the instruments were highly appraised by our specialists.

  • Open Original

    CAPITAL-STROY DIAGNOSTIKA, LLC

    PKR-2 analyzer for diagnosis of transformer OLTC was procured by our company in 2014. Measurements were started in 2015. Measurements were performed on 110kV transformers with OLTS of РНТ-13, РНТ-20, РС-3, РС-4, and РС-9 types.

    The instrument is easy to use, it has many useful functions. The  PKR-2 allowed identification of the following problems of the OLTC operation:

    • Wear of arch extinguishing contacts;
    • Resistors damage;
    • Unacceptable travels in the shaft fixing nodes;
    • Shaft shifts;
    • Incorrect connection of taps. 


    Measurements using PKR-2 were two or three times faster than those by conventional methods. The instrument is rather convenient in operation.

    The analyzer can be recommended to other companies for use.

  • Open Original

    Engineering Center EnergoRazvitie, LLC

    EnergoRazvitie Engineering Center, LLC reports that the MIKO-9A, PKR-2M, MIKO-2.3, PKV/M7 instruments operated by our organization, manufactured and delivered by your enterprise, meet the requirements for them. The equipment and functionality of the devices are provided in accordance with the order.

    The MIKO-2.3 instrument and the control instrument for high-voltage circuit breakers PKV/M7 are actively used by our organization in measuring the contact resistance of contacts of high-voltage circuit breakersIn particular, gas-insulated core circuit breakers of the ELF type SP7-2 at 500 kV manufactured by ABB. MIKO-2.3 is convenient to use due to its small size. The current generated by the device allows you to burn through the contact and get stable readings of the transition resistance. The advantage of the device is also the combination of potential and current circuits in two terminals and taking into account the own resistance of the wires included in the kit. In general, MIKO-2.3 allows you to reduce the measurement time and get stable and reliable results. However, it is worth paying attention to the fast discharge of the battery when using a microohmmeter, which determines the dependence of the instrument on the availability of the mains. Test leads for 500 kV circuit breakers must be of a minimum length of 10 meters with reliable and convenient clamps for connection, and this requires additional specification of the order.

    Circuit breaker analyzer PKV/M7 is simple and convenient to operate, it allows you to control the main characteristics of high-voltage switching devices. The positive thing is that in one measurement cycle the device allows you to measure several parameters, which significantly reduces the processing time and assess the technical condition of the circuit breaker. A small number of contact cables and the use of different instrument connectors make it possible to reduce the likelihood of personnel errors when assembling the test circuit. PKV/M7 is a universal device that allows you to control the parameters of high-voltage circuit breakers, and can be safely recommended to organizations involved in the commissioning and operation of high-voltage equipment.

    The MIKO-9A instrument is used to test power transformers and autotransformers. In particular, in May 2020, the device was successfully tested on the ATDCTN-250000/220/110 autotransformer. MIKO-9A is equipped with a wide range of test leads, (it is possible to measure three-phase circuit), which makes it possible to quickly perform a large number of measurements, reducing connection operations, with a minimum of specialists.

    The presence of a built-in high-capacity battery allows measurements in the field, regardless of the availability of the mains. The device is very convenient to use (the presence of automatic mode, an important demagnetization option for the transformer, a convenient and intuitive interface), is small and lightweight.

    The PKR-2M instrument is used to check the technical condition of switching devices of transformers of all types, both resistor and reactor, using the collapsible method, as well as for diagnosing on-load tap-changers with current-limiting resistors without removing the contactor tank cap. The presence of a built-in battery increases its mobility and ease of use. Equipped with long probes (optional) and a cable with crocodile clamps, it makes it easy to connect to most on-load tap-changers.

    The use of these instruments allows our specialists to reduce the time of testing and measurement. These devices these devices are good to use, correspond to the declared characteristics and surpass in many aspects similar devices from other manufacturers.

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