Transformer OLTC diagnostic system PKR-2M

Certificates

  • Safety Test Certificate IEC 61010-1:2001
  • Conformity certificate with safety requirements EC/EU
  • Russian State Register Certificates
  • 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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Resistor type OLTC non-demountable diagnostic (DRM method)

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Resistor type OLTC contactor switchover oscillography

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Circular diagram recording of the resistor and reactor type OLTCs

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Automatic self-adjustment to OLTC

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Reactor type OLTC check in "static" mode

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Ergonomic probes or crocodile clamp cables

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Self-contained power supply, storage, transfer and analysis of measurement results in the instrument and PC

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The instrument is represented in two modifications

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PKR-2M is intended for demountable diagnostic of OLTC devices of all types (both resistor and reactor), as well as for non-demountable diagnostic, which enables to diagnose OLTCs with current-limiting resistors without removing contactor tank cover.

PKR-2M enables diagnostic of OLTC devices manufactured by: Huaming, MR, ABB, Hyundai Heavy Industries-Bulgaria.

Watch detailed video-reviews about PKR-2M OLTC-analyzer up above or on our YouTube. Watch videos and subscribe.

OLTC non-demountable check (DRM method) enables to conduct express diagnostic of the OLTCs with current-limiting resistors without opening the tank. Based on the results obtained in the DRM mode, there are two graphs built: resistance versus time and conductivity versus time.

For example, for OLTC types RS, RNOA, etc., 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 OLTCs of RNTA – 35/320 type and its analogues, 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 non-demountable check mode based on the DRM method doesn’t require:

  • Opening of the tank or hatch of the fault-free/faulty OLTC and oil drain;
  • Additional money and labor costs for the OLTC diagnostic;
  • Connection of additional elements or knowledge of resistances of current-limiting resistors of the checked OLTC device, since all fine adjustments to a certain OLTC are conducted automatically in the instrument.

The switchover oscillography enables to detect the actuation delay, non-simultaneity of in phase actuation and bouncing during switchover.

All characteristics are taken:

PKR-2M is completed with a special transducer for circular diagram recording. 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 protrusion.

All characteristics are taken:

No additional elements (for example, resistors) or knowledge of resistances of current-limiting resistors of the checked OLTC device are required to measure the parameters. All adjustments to a specific OLTC are performed automatically in the instrument.

Reactor OLTCs can be checked in a static mode with the help of PKR-2M device. The user rotates the drive shaft with the handle from the standard complete set in slow motion. And at this time the moments of contacts closing / opening are displayed on the display of the device in degrees and in values of voltage and current.

For the convenience of direct connection to the contacts of the OLTC, when the tank is opened with partial or complete oil drain, PKR-2M is equipped with special long probes.

Without contact probes connection to the OLTC can be done by using a cable with crocodile clamps. In this case, partial or complete oil drain should be carried out from the contactor tank, or OLTC should be completely removed from the transformer tank.

PKR-2M is equipped with a built-in battery that increases its mobility and ease of use. Autonomous power supply allows you to operate the device during the entire work day on a large territory of substation or workshop without recharging. Built-in battery saves you from the hassle with mains cable, mains network extension and grounding.

The instrument is equipped with a large sensor color graphic display that enables to represent information in graphical or tabular form. High brightness and contrast make it easier to process the graphs.

Measurement results might be stored in one of the ways: in the non-volatile memory of the instrument, on the external flash memory, or they may be transferred to the PC.

Moreover, the instrument may be controlled by instrument keyboard, sensor display, or PC. The last mentioned function allows you to record diagrams while sitting with a PC in a car, which is important and comfortable during the cold season.

  PKR-2 PKR-2M
OLTC check mode
demountable
demountable and non-demountable (DRM method)*
Built-in battery supply
none
available
(operation time from 2 to 16 h)

*Non-demountable check mode enables to conduct the in-place diagnostics of OLTCs with current-limiting resistors without opening the contactor tank cover. This mode is based on the DRM method (Dynamic Resistance Measurement) and consists in measurement of current intensity through the winding, in which the OLTC is switched on.

Specifications Value
Time interval measuring range 0.01 - 1200 s
Accuracy ±(3 + tx) × 10-4,
where tx - measured time interval, sec
Resolution ±0.1 ms
Angular movement measuring range 2 - 360 º
Accuracy ±0.56 º
Measuring range of DC current 1 - 4 А
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
PC connection USB and USB host
Display TFT color graphic multi touch,
640 x 480 pixels
Power supply (built-in battery) Lithium-ion battery
Battery runtime (in continuous operation) of PKR-2M 2-8 h
Battery charging time 2.5 h
Maximum power consumption in standby mode 15 W
Maximum power consumption in measurement mode 210 W
Power supply (mains voltage) AC 150-242 V, 47-63 Hz
DC 150-300 V
Operation temperature range -20ºС - +40ºС
Environmental protection IP 64 (device cover closed)
IP 20 (device cover open)
Maximum measuring unit weight 6.1 kg
Dimensions 360 x 290 x 165 mm
Interface and user manual language English
Warranty 3 years
Calibration period 3 years

Standard complete set

Photo Item, Index Application
Main instrument PKR-2М
  • Main instrument PKR-2М
  • SKB035.00.00.000-1
  • Main instrument PKR-2М
  • SKB035.00.00.000-1

Instrument and accompanying documents: Calibration Certificate, User Manual, Log Book, PC software.

Test cable with a connector<br>and A, B, C pole cables
  • Test cable with a connector
    and A, B, C pole cables
  • SKB035.34.00.000
    SKB035.34.00.000-01
    SKB035.34.00.000-02
    SKB035.39.00.000
  • Test cable with a connector
    and A, B, C pole cables
  • SKB035.34.00.000
    SKB035.34.00.000-01
    SKB035.34.00.000-02
    SKB035.39.00.000

Connector cable 1 x 8 m.
A, B, C pole cables 3 x 1.5 m with jaw up to 25 mm.

This cable is used in the demountable diagnostic mode to connect to the contacts of the transformer OLTC inside the tank, as well as in the non-demountable diagnostic mode (DRM test) to connect to the inputs of transformer up to 220 kV.

Short-circuit cable
  • Short-circuit cable
  • SKB035.31.00.000
  • Short-circuit cable
  • SKB035.31.00.000

Short-circuit cable 3 x 12 m for non-demountable diagnostic of OLTC devices of power transformers and autotransformers.
At the end of each short-circuit cable there are two crocodile clips with jaw up to 50 mm.

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. Angle measuring range – 2 - 360º (it is necessary to select an appropriate axis from the additional complete set).

C-clamp
  • C-clamp
  • SKB035.30.00.000
  • C-clamp
  • SKB035.30.00.000

To fix the DP22 transducer on the OLTC drive.

Handle
  • Handle
  • SKB028.25.00.000
  • Handle
  • SKB028.25.00.000

To fix the magnetic clamp.
Handle for the OLTC shaft rotation. It is used together with axis 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 for the OLTC drives of the MZ-4.1; M3.2; M3-4 type. For the drive of PDP-4U type this axis is used together with the bushing.

Axises for other drives are represented in the additional complete set.

Mains cable
  • Mains cable
  • SKB018.09.00.0000
  • Mains cable
  • SKB018.09.00.0000

For connecting the instrument to the power supply. Temperature range -15ºС - +45ºС (length – 2 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. Nominal current – 50 А (length – 2 m).

Fuses
  • Fuses
  • Fuses

Type VP2B-1V-2A (ВП2Б-1В-2А) (2 pcs) to protect the power source.

Tool bag
  • Tool bag
  • SKB126.06.00.000
  • Tool bag
  • SKB126.06.00.000

Robust, convenient, wear proof bag for transportation of cables, documentation, and other accessories to PKR-2M. The bag is especially useful when the set is carried to an object, so that all the needed accessories are kept together.

Additional complete set (on order)

Photo Item, Index Application
DRM test cable
  • DRM test cable
  • SKB035.38.00.000
  • DRM test cable
  • SKB035.38.00.000

To be used together with the standard SKB035.39.00.000 test cable during non-demountable diagnostic (DRM-method) for connection to transformers above 200 kV and to autotransformers. Length - 6 m.

Additional resistor
  • Additional resistor
  • SKB035.40.00.000
  • Additional resistor
  • SKB035.40.00.000

It is used for non-demountable diagnostic of OLTCs to filter out interference generated during the measurements due to self-excitation of the transformer.

Contact probes set in a special case
  • Contact probes set in a special case
  • SKB035.27.00.000
  • Contact probes set in a special case
  • SKB035.27.00.000

Contact probes 7 x 0.85 m for connecting to the OLTC contacts without or with partial oil drain. When assembled with an extension cable, the length increases to 1.55 m.
The probes are supplied in the convenient carrying case.

Axes for DP22 transducer fixation to the output shaft
  • Axes for DP22 transducer fixation to the output shaft
  • Axes for DP22 transducer fixation to the output shaft

Select the axis for DP22 transducer fixation to the output shaft:

  • Axis No. 1 - for OLTC drives of BUL type (SKB035.25.01.000);
  • Axis No. 2 - for OLTC drives of PDP, МА-1, МAK-1 types (SKB035.25.02.000);
  • Axis No. 3 - for OLTC drives of PDP, МА-1, MAK-1 types (SKB035.25.03.000);
  • Axis No. 4 - for OLTC drives of PDP, МА-1, MAK-1 types (SKB035.25.04.000);
  • Axis No. 6 - for OLTC drives of PDP-4U type (when a manual drive is used) (SKB035.25.06.000);
  • Axis No. 9 - for OLTC drives of PDP-4U type (when an electric drive is used) (SKB035.25.09.000);
  • Axis No. 7 - for OLTC drives of MZ-4.1, MZ-4.4 types (when the electric drive is used) (SKB035.25.07.000);
  • Axis No. 8 - for OLTC drives of MZ-4.1, MZ-4.4 types (when the manual drive is used) (SKB035.25.08.000);
  • 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) (SKB035.25.11.000);
  • 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) (SKB035.25.12.000);
  • Axis No. 13 - for OLTC drives of VAKUTAP type manufactured by MR (SKB035.25.13.000).

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
  • SKB010.41.00.000
    SKB010.41.00.000-01
    SKB010.41.00.000-02
  • Manipulating rod
  • SKB010.41.00.000
    SKB010.41.00.000-01
    SKB010.41.00.000-02

Manipulating rod is designed for test cables connection from the ground or from the tank cover to the bushings of high-voltage circuit breakers, and to the structural elements of high-voltage disconnecting switches and earthing devices, without the use of ladders or elevated platforms.

The manipulating rod is completed with special extension cables. There is a Kelvin clamp with current and potential contacts to connect to the object on one side, and a contact pad on the other side. The device test cable is connected to the contact pad from the ground or a tank cover.

Manipulating rod extension cable is made according to a four-wire (Kelvin) scheme with the test current capacity of 50 A.

OLTC analyzer PKR-2
  • Open Original

    Southern Ural PMES the branch of FGC UES, PJSC

    Southern Ural PMES the branch of FGC UES, PJSC expresses its gratitude to the company SKB EP, LLC together with the company HUAMIN, LLC for the high-quality and useful on-site demonstration of the HUAMIN CV series OLTC with digital and traditional drives and for the demonstration of PKR-2M OLTC analyzer. During this demonstration were represented high technical developments of a wide range of OLTCs as well as flexible technical conditions for replacing the OLTC when repairing transformers.

    Also, the specialists of our company highly appreciated the technical capabilities of the PKR-2M OLTC analyzer. This device allows you to obtain contactor oscillograms for a wide range of OLTCs without demounting and opening the OLTC tank.

    We express our confidence in maintaining the existing friendly relations and hope for further mutually beneficial and fruitful cooperation.

  • Open Original

    Electrotechnical Laboratory of the Yaroslavl Power Supply Distance of the Northern Energy Supply Directorate

    To date, the following devices are in operation in the electrotechnical laboratory of the Yaroslavl Power Supply Distance of the Northern Energy Supply Directorate: MIKO-2.3, MIKO-7, PKR-1 and PKV/M7.

    These devices are used in conducting a comprehensive survey of electrical equipment of substations, such as power and converter transformers, high-voltage circuit breakers, and disconnectors. During the tests, SKB EP devices gave a good account of their reliability, stability of operation, and ease of use. When using the above-mentioned devices, total measurement time was reduced.

    The use of PKR-1 OLTC analyzer made it possible to more accurately determine the defects of the power transformer and tap changing device during a comprehensive check-up. The most frequently diagnosed damages are burning and adjustment of the contactor contacts of the tap changing device. The second most common defect is the burning of circuit breaker contacts. One of these defects was confirmed by the visual inspection.

    The use of MIKO-2.3 and MIKO-7 devices that are dedicated to the resistance measurement in inductive circuits gave the greatest reduce of measurement time. When using an AC bridge, one resistance measurement of the 110 kV transformer winding lasted about 1.5 minutes. When using MIKO-2.3 or MIKO-7 devices, the time spent on one measurement was reduced to 30 seconds.

    PKV/M7 circuit breaker analyzer is used for a comprehensive assessment of the state of high-voltage circuit breakers. As the main direction was chosen the assessment of SF6 circuit breakers of MKP-110 type. There is a big survey conducted of SF6 circuit breakers installed instead of oil circuit breakers. The use of PKV/M7 circuit breaker analyzer has reduced the time spent on the diagnostics of circuit breakers, and increased the accuracy of the data obtained. Previously, the measurements of the moving parts movement and compression were controlled by a ruler with oil drained from the circuit breaker tank. PKV/M7 circuit breaker analyzer is, first of all, more comfortable to use and has better accuracy comparing to the previously used methods.

    Having experience in the operation of SKB EP devices since 2016, we can definitely recommend the use of these devices for diagnostics of energy facilities.

  • Open Original

    Tulenergo the branch of IDGC Centre and Volga region, PJSC

    Since 2006, Tulenergo the branch of IDGC of Center and Volga region, PJSC, has been using devices PKV/M6, PKV/M7, MIKO-1 and PKR-2M manufactured by SKB EP, LLC.

    PKV/M7 and MIKO-1 have become irreplaceable assistants in diagnostic of high-voltage switches the following types: VMG-133, VMP-10, VK-10, VBM-10-20, S-35, VT-35, VGBE- 35, MKP-110, VGT-110. PKR-2M is used to accurately and quickly assess the state of the switching device of power transformers.

    All devices are reliable, convenient and easy to use thanks to the clear interface and small dimensions.

    We express our gratitude to SKB EP, LLC for the production of high-quality and also we recommend devices of the company to organizations involved in the installation, debugging, operation and repair of electrical equipment.

    Churakov A.V.
    Commissioning and testing engineer of Diagnostic Service

    Odinets A. A.
    Acting head of Diagnostic Service

  • Open Original

    "Belenergoremont" branch of "Belenergoremnaladka", JSC

    Since 2018,the Belenergoremont" branch of "Belenergoremnaladka", JSC has been operating an OLTC analyzer PKR-2 device.

    During the entire life of the specified device, there were no facts of incorrect operation. The equipment has established itself as reliable, unpretentious and easy to operate

    As necessary, service, warranty, as well as qualified support in the operation of the device are provided by the supplier of NPP Belenergokip promptly and in full.
  • Open Original

    Engineering Center EnergoRazvitie, LLC

    EnergoRazvitie Engineering Center, LLC reports that MIKO-9A, РКR-2М, MIKO-2.3, РКV/М7 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.

    МIКО-2.3 instrument and high-voltage circuit breaker analyzer РКV/М7 are actively used by our organization in measuring the contact resistance of high-voltage circuit breakers. ln particular, gas-insulated core circuit breakers of the ELF type SP7-2 at 500 kV manufactured by АВВ. 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 contact 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 а micro-ohmmeter, which determines the dependence of the instrument on the availability of the mains. Test leads for 500 kV circuit breakers must be of а minimum length of 10 meters with reliable and convenient clamps for connection, and this requires additional specification of the order.

    Circuit breaker analyzer РКV/М7 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. А small number of contact cables and the use of different instrument connectors make it possible to reduce the likelihood of personnel error when assembling the test circuit. РКV/М7 is а 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.

    МIКО-9А instrument is used to test power transformers and autotransformers. In particular, in May 2020, the device was successfully tested on the А ТDСТN-250000/220/11 О autotransformer. MIKO-9 А is equipped with а wide range of test cables (it is possible to measure three-phase circuit), which makes it possible to quickly perform а large number of measurements, reducing connection operations, with а minimum of specialists.

    The presence of а 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, а convenient and intuitive interface), is small and lightweight.

    РКR-2М 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 а built-in battery increases its mobility and ease of use. Equipped with long probes (optional) and а 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.

  • 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.

  • Open Original

    Kurskenergo the branch of Rosseti Centre, PJSC

    2 measurement devices manufactured by SKB EP, LLC are used in the Western section of the diagnostics service of Kurskenergo the branch of Rosseti Centre, PJSC: PKR-2M transformer OLTC analyzer and MIKO-8M milliohmmeter. PKR-2M device has been used since 2018, and MIKO-8M device has been used since 2019.

    These devices are used for diagnostics of power and measuring transformers of voltage 110, 35, 10 kV (MIKO-8M) and OLTCs of power transformers of 110, 35 kV (PKR-2M).

    In practice, both devices have proven themselves from the best side: compact, robust case, convenient and easy-to-use interface, the ability to select the necessary schemes and groups of winding connection. The ability to create and maintain an archive, including the ability to enter factory test data that allows you to carry out the primary analysis of diagnostics results directly at the workplace. High-quality of test cables and clamps, the possibility of adjusting the scope of the complete set. All this greatly reduces the time and labor costs when carrying out equipment diagnostics in comparison with the previously used fleet of devices. It should also be noted that there is software for analyzing and storing diagnostics results on a PC. Furthermore, there is the ability to obtain the necessary information or consultation directly from the device developers.

    The use of PKR-2M and MIKO-8M devices manufactured by SKB EP, LLC brought the diagnostics of power and measuring transformers to a new, higher quality level.

    PKR-2M and MIKO-8M devices manufactured by SKB EP, LLC are recommended to be used by enterprises and companies engaged in the repair and diagnostics of power and measuring transformers.

    I.V. Shirlin
    Head of the Western Section of the Diagnostics Service

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