Transformer OLTC diagnostic system PKR-2M

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OLTC maintenance check

Resistor type OLTC non-demountable diagnostic (DRM method)

Resistor type OLTC contactor switchover oscillography

Circular diagram recording of the resistor and reactor type OLTCs

Automatic self-adjustment to OLTC

Reactor type OLTC check in "static" mode

Ergonomic probes or crocodile clamp cables

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

The instrument is represented in two modifications

Control instrument of OLTC transformers PKR-2M

Use of the PKR-2M instrument for the transformer LTC testing

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 switching device, 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:

characteristics of high-speed OLTCs installed in the neutral of the windings that are "star with neutral" or "zigzag with neutral" connected are recorded by three phases simultaneously.
characteristics of OLTCs installed in a line of windings that are "star", "delta" or "zigzag" connected are recorded phase by phase.

A standard oscillogram of the resistor type OLTC

An oscillogram of the resistor type OLTC recorded by PKR-2M instrument

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:

simultaneously in three phases for OLTCs located in the neutral conductor of Star-connected windings;
phase by phase for OLTCs located in the line of Star- or Delta-connected windings.

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.

Standard circular diagram recorded on the reactor type OLTC RNT-13

Circular diagram of the reactor type OLTC recorded by PKR-2M instrument in three phases

Circular diagram of the reactor type OLTC in a table format

Circular diagram of the reactor type OLTC recorded by PKR-2M instrument

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.

Analysis of the circular diagram of reactor type OLTC using PC software

Oscillogram analysis recorded in the DRM mode using PC software

Analysis of the circular diagram of reactor type OLTC using PC software

Oscillogram analysis recorded in the DRM mode using PC software

	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 diagnostic 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.

规格	值

Additional complete set (on order)

照片	项目，索引	应用
DRM test cable 035.38.00.000	DRM test cable 035.38.00.000	To be used together with the standard 035.39.00.000 test cable during non-demountable diagnostic (DRM-method) for connection to transformers above 200 kV and to autotransformers. Length - 6 m.
Additional resistor 035.40.00.000	Additional resistor 035.40.00.000	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 035.27.00.000	Contact probes set in a special case 035.27.00.000	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	Select the axis for DP22 transducer fixation to the output shaft: Axis No. 1 - for OLTC drives of BUL type (035.25.01.000); Axis No. 2 - for OLTC drives of PDP, МА-1, МAK-1 types (035.25.02.000); Axis No. 3 - for OLTC drives of PDP, МА-1, MAK-1 types (035.25.03.000); Axis No. 4 - for OLTC drives of PDP, МА-1, MAK-1 types (035.25.04.000); Axis No. 6 - for OLTC drives of PDP-4U type (when a manual drive is used) (035.25.06.000); Axis No. 9 - for OLTC drives of PDP-4U type (when an electric drive is used) (035.25.09.000); Axis No. 7 - for OLTC drives of MZ-4.1, MZ-4.4 types (when the electric drive is used) (035.25.07.000); Axis No. 8 - for OLTC drives of MZ-4.1, MZ-4.4 types (when the manual drive is used) (035.25.08.000); 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) (035.25.11.000); 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) (035.25.12.000); Axis No. 13 - for OLTC drives of VAKUTAP type manufactured by MR (035.25.13.000).
USB 2.0 A-B cable	USB 2.0 A-B cable	For the instrument connection to PC (length – 1.8 m).
Manipulating rod 010.41.00.000 010.41.00.000-01 010.41.00.000-02	Manipulating rod 010.41.00.000 010.41.00.000-01 010.41.00.000-02	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 100 A in the presence of a good contact. Manipulating rod - 2.2 (length 2.2 m / weight as an assembled set 3.4 kg); Manipulating rod - 3.7 (length 3.7 m / weight as an assembled set 4.0 kg); Manipulating rod - 5.1 (length 5.1 m / weight as an assembled set 4.6 kg).

Standard complete set

照片	项目，索引	应用
Main instrument PKR-2М 035.00.00.000-1	Main instrument PKR-2М 035.00.00.000-1	Instrument and accompanying documents: Calibration Certificate, User Manual, Log Book, PC software.
Test cable with a connector and A, B, C pole cables 035.34.00.000 035.34.00.000-01 035.34.00.000-02 035.39.00.000	Test cable with a connector and A, B, C pole cables 035.34.00.000 035.34.00.000-01 035.34.00.000-02 035.39.00.000	带连接器的测试电缆 1 x 8 m。A、B、C 相电缆 3 x 1.5 m，钳口最大可达 25 mm。该电缆可用于可拆卸诊断模式，以连接到油箱内变压器有载分接开关的触点，并可以用在不可拆卸诊断模式（DRM测试）中用于连接到高达220 kV的变压器输入端。要连接到220 kV以上的变压器和自耦变压器的输入端，请选择带夹具的035.38.00.000测试电缆，该电缆与035.39.00.000连接器一起使用。
Short-circuit cable 035.31.00.000	Short-circuit cable 035.31.00.000	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 035.26.00.000	Angular movement transducer DP22 035.26.00.000	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 035.30.00.000	C-clamp 035.30.00.000	To fix the DP22 transducer on the OLTC drive.
Handle 028.25.02.000	Handle 028.25.02.000	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 035.25.00.000 028.25.01.008	Axis No.10 together with a bushing 035.25.00.000 028.25.01.008	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 018.09.00.0000	Mains cable 018.09.00.0000	For connecting the instrument to the power supply. Temperature range -15ºС - +45ºС (length – 2 m).
Ground cable 010.01.00.000	Ground cable 010.01.00.000	For instrument case grounding. Equipped with a ground clamp and screw end cap. Nominal current – 50 А (length – 2 m).
Fuses	Fuses	Type VP2B-1V-2A (ВП2Б-1В-2А) (2 pcs) to protect the power source.
Tool bag 126.06.00.000	Tool bag 126.06.00.000	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. Weight 0.6 kg.