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Maintenance check of oil, vacuum, sulfur-hexafluoride (SF6) and air-blast circuit breakers for all voltage classes from 10kV to 1,050kV
Diagnostics of domestic and foreign circuit breakers
Monitoring of air-blast circuit breakers with the help of unique cable for 10 variable-resistance transducers
Checkout of travel and speed parameters by three phases simultaneously
Wide ranges of time intervals, speed and travel measurement covering the needs for monitoring of existing circuit breakers
Automatic calculation of technical characteristics of high-voltage circuit breakers
Apart from numerical data this instrument provides graphical results which allow detecting of incipient defects
Monitoring of high-voltage circuit breakers in simple and compound cycles
PKV/U3 is represented in two modifications

Circuit breaker analizers PKV/U3.0

Certificates
  • Safety Test Certificate IEC 61010-1:2001
  • EMC Compatibility IEC 61326-1:2005
  • Russian Register of Innovative Products
  • Russian State Register Certificates
  • Declaration of Conformity of the Customs Union
Maintenance check of oil, vacuum, sulfur-hexafluoride (SF6) and air-blast circuit breakers for all voltage classes from 10kV to 1,050kV
  • checkout of speed and travel parameters of oil, vacuum, SF6 and air-blast circuit breakers with up to 20 breaks per pole;
  • checkout of time characteristics of high-voltage disconnecting, isolating and short-circuiting switches;
  • measuring of electromagnet currents and voltages and solenoid heavy currents with the help of clamp meters;
  • built-in remote control for setting of ordinary operations and compound cycles for circuit breakers with the current of up to 35A for DC/AC drives;
  • large-scale software.
Diagnostics of domestic and foreign circuit breakers

PKV/U3.0 is complete with attachment devices for the installation of measuring transducers on all types of Russian- and foreign-manufactured high-voltage circuit breakers (ABB, AREVA, ALSTOM, SIEMENS, etc.).

If attachment of linear movement transducer is not envisaged for high-voltage equipment, you can use angular transducer instead. The instrument will automatically recalculate angular movement transducer readings to the travel of contacts.

A set for foreign-manufactured high-voltage circuit breakers (ABB, AREVA, ALSTOM, SIEMENS, etc.) is supplied on order.

Monitoring of air-blast circuit breakers with the help of unique cable for 10 variable-resistance transducers

One of the main items subject to diagnostics at air-blast circuit breakers’ (VO-750, VO-1150, VNV-1150, VNV-500-40, VNV-500-65, etc.) operation monitoring is the measurement of nozzle actuator movement parameters (nozzle travel, movement start and end time, etc.).

For the purpose of monitoring of these parameters a rheostat the moving part of which is rigidly attached to the moving part of the drive is screwed into a special drive bore. When drive movement changes, resistance of the rheostat changes as well and this change is recorded by PKV/U3.0.

The cable for 10 variable-resistance circuit breakers is supplied in the standard complete set of the instrument.

Checkout of travel and speed parameters by three phases simultaneously

In order to get complete and objective information on the state of a high-voltage circuit breaker, travel and speed parameters should be taken by each of its poles.

While performing measurement with one transducer, you have to measure travel parameters of each pole by switching from one pole to another performing three switching Close/Open operations. However, applying of three transducers simultaneously, which can be done with PKV/U3.0, will allow performing measurement process much quicker as only 1 switching Close/Open operation will be needed.

Standard complete set of PKV/U3.0 includes linear DP12 (1pcs.) and angular DP21 (1pcs.) movement transducers. In order to check parameters by three phases simultaneously one more group of DP12 (2 pcs.) and/or DP21 (2 pcs.) as well as the required tool kit with all necessary accessories is supplied on order.

Wide ranges of time intervals, speed and travel measurement covering the needs for monitoring of existing circuit breakers

Wide ranges of measurement by time (up to 8.1 sec), speed (up to 20 m/sec) and travel (up to 900 mm), covering the needs for monitoring of all existing high-voltage circuit breakers. For instance, the smaller time range of similar instruments does not allow for monitoring the operation of circuit breakers in compound cycles.

There are a number of nuances at measurement performance. For example, while registering of time characteristics of any high-voltage circuit breaker is quite a simple process, receiving of travel and speed characteristics can be performed only with the use of special linear or angular movement transducers.

Thus, if the advertisement of the instrument indicates that it can perform monitoring, for instance, of vacuum or oil circuit breakers but no transducer is included in the instrument kit, it means that monitoring of time characteristics only is envisaged.

PKV/U3.0 is supplied with incremental (discrete) transducers for measurement of speed characteristics and travel parameters which do not require adjustment or correction of conversion factors; these transducers provide accurate results and are convenient in service. Instruments with wire rope transducers, for instance, have a limited upper value for speed. Pull-back spring of these transducers does not have enough time to reel the wire rope onto the drum in case of rapid change of speed and measurement results become less accurate. It is not recommended to use laser movement transducers as there is a risk of eye damaging by the laser beam in case of mishandling.

Automatic calculation of technical characteristics of high-voltage circuit breakers

PKV/U3.0 is a measuring “brain” which performs all necessary calculations. In order to view the results of diagnostics you need to connect the instrument to a portable personal computer (PC) with special software allowing you to view and analyze the obtained results.

The expanded set of time, travel and speed characteristics both for drive shaft and contacts as well as of voltages and currents of electromagnets and solenoid of the drive: time diversity, bounce durability, delay, rebound and transfer, medium velocities at various sections of travel, etc.

Apart from numerical data this instrument provides graphical results which allow detecting of incipient defects

Along with the tables of digital values of parameters more detailed information on circuit breaker condition can be obtained from the following registered graphs of processes:

  • relation between speed and time, speed and travel;
  • relation between electromagnet currents and voltages, and time and travel;
  • diagrams of contact opening-closing.


Automatic graphical overlay of circuit breaker phase cross-arms movement allows for accurate detection of such major defects as pole mechanism end play. It is particularly important for circuit breakers having one drive for three phases. Such defect cannot be detected using numeric data only. The state of the guide system also cannot be evaluated without viewing the graphs of moving parts movement process. It is also not possible to identify the node contributing to switch off delay using numeric data only. In this case the graph of speed against time of the process also provides comprehensive information as it is possible to separate the time of drive operation and operation time of mechanisms of the circuit breaker itself.

Monitoring of high-voltage circuit breakers in simple and compound cycles

PKV/U3.0 is equipped with a power switch for control of switching device drive with solenoid current of up to 35А (direct and alternating) which allows performing both simple switching close or switching open operations and compound cycles "Open-Close", "Close-Open", "Open-Close-Open".

PKV/U3 is represented in two modifications

One of the main characteristics of PKV/U3 is that it is produced in two modifications which differ in the number of channels of movement transducers (1 or 3) and number of channels of variable-resistance transducers monitoring (2 or 12): PKV/U3.1 and PKV/U3.0, correspondingly.

Thereby, PKV/U3.1 allows monitoring of all types of air-blast circuit breakers, except for models VO-750, VO-1150, VNV-1150, which is available in the other instrument version.

  PKV/U3.0 PKV/U3.1
Number of variable-resistance transducer channels 12 2
Number of movement transducer channels 3 1
Number of movement transducers in the set DP21 (up to 3 pcs.)
and DP12 (up to 3 pcs.)
DP21 (1 pcs.)
and DP12 (1pcs.)
Circuit breakers subject to testing all all, except for VO-750, VO-1150, VNV-1150
Simultaneous measuring of basic shaft turn angle and drive arm turn angle and pole available not available
Specifications Value
Number of discrete channels for circuit breaker contacts monitoring, pcs. 20
Range of measurement and recording of time intervals, sec 0.0004 ÷ 8
Maximum permissible intrinsic error of time interval measurement, ms ±[0.1 + 0.0001*Тх], where Тх – measured time interval
Number of channels of incremental movement transducers, pcs. 3 (for DP12 or DP21 transducers)
Range of linear movements measurement by DP12 transducer, mm 0.5 ÷ 900
Resolution of linear movements measurement by DP12 transducer, mm 0.5
Maximum permissible intrinsic error of linear movements measurement by DP12 transducer, mm ±1
Range of angular movements measurement by DP21 transducer, degree 0.09 ÷ 360
Resolution of angular movements measurement by DP21 transducer, degree 0.09
Maximum permissible intrinsic error of angular movements measurement by DP12 transducer, mm ±[0.2 + 0.001*a], where a – measured movement
Range of moving speed measurement, m/sec 0.02 ÷ 20
Maximum permissible intrinsic relative error of speed measurement by DP12 transducer in the range of 0.02 ÷ 10 m/sec, % ±2
Maximum commutated current (actual value), А 35
Response level of power switch at short-circuiting and excessive current (peak value), А 58 ± 8
Current measuring range (peak value), А ±50
Range of measured voltages of switch voltage channel (peak value), V ±350
Range of voltage measuring by shunt voltage channel (peak value), mV ±75
Voltage measuring range for “Input 1” and “Input2” channels, V 0 ÷ 12 (monopolar mode), ±6 (bipolar mode)
Resistance measuring range for “Input 1” and “Input2” channels, Ohm 0 ÷ 2400 Ohm; (output current of 4 мА); 0 ÷ 160 Ohm (output current of 60 мА)
Types of data transfer channels Ethernet IEEE 802.3 and RS-232
Maximum consumed power, W 60
Operation temperature range, ºС -15 ÷ +40
IP rating in operating state IP20
Maximum measuring unit weight, kg 10
Dimensions, mm 300х140х400
Interface language English
User manuals language English
Calibration interval, year 3
Standard complete set
Photo Item, Index Application
PKV/U3.0 measuring unit PKV/U3.0 measuring unit SKB021.00.00.000 Instrument and accompanying documents: calibration certificate, operation manual, record book, software / user manual.
Linear movement transducer DP12 Linear movement transducer DP12 СКБ012.00.000-02 For measuring of moving parts’ movement in high-voltage circuit breakers (set includes data sheet and calibration certificate). Range – 0 ÷ 900 mm. Resolution – 0.5 mm. Used together with a measuring stick.
Measuring stick Measuring stick СКБ010.15.00.000-02 Measuring stick in a box. Used together with linear movement transducer DP12 (length – 700 mm // on order – 550 mm and 1,000 mm).
Angular movement transducer DP21 Angular movement transducer DP21 СКБ009.00.00.000 For measuring of shaft turn angle in high-voltage circuit breakers (set includes data sheet and calibration certificate). Measuring range – 0 ÷ 360°. Resolution – 0.09°.
Transducer cable Transducer cable СКБ014.25.00.000 For connecting linear (DP12) or angular (DP21) movement transducer to the instrument. Cable insulation – silicone (length – 12 m).
Mains cable Mains cable СКБ018.09.00.000 For connecting the instrument to the power line. Temperature range – 25°С ÷ +45°С. Rubber insulation (length – 2 m).
LAN cable LAN cable СКБ024.26.00.000 For connecting the instrument to the computer network or notebook (length – 2 m).
RS-232 cable RS-232 cable СКБ024.25.00.000 For connecting the instrument to the computer network or notebook (length - 1.5 m).
Switch input voltage cable Switch input voltage cable СКБ022.06.00.000 For commutated voltage supply. Rated current – 50А. Cable insulation – silicone (length – 2 m).
Local start cable Local start cable СКБ022.07.00.000 For connecting to the high-voltage circuit breaker drive. Equipped with alligator type clamps. Rated current – 50А. Cable insulation – silicone (length – 2.5 m).
Remote start cable Remote start cable СКБ021.26.00.000 For remote start of measuring processes of the instrument. Connected to the drives of high-voltage circuit breaker electromagnet. Rubber insulation (length – 5 m).
А, В, C, D poles cables (4 pcs.) А, В, C, D poles cables (4 pcs.) СКБ010.05.00.000/-01/-02/-06 For connecting to the poles of high-voltage circuit breaker. Equipped with alligator type end caps. Cable insulation – silicone. Throat Ø - 30 mm (length – 11 m).
Cable end caps (8 pcs.) Cable end caps (8 pcs.) СКБ021.26.00.003 For connecting to the drive of the high-voltage circuit breaker in case it is not convenient to connect to the screws of the drive strip through alligator type end caps.
Pole cable (20 channels) Pole cable (20 channels) СКБ021.23.00.000 For connection to the contacts of air-blast high-voltage circuit breakers. Equipped with М4 screw end caps (length – 1.2 m).
Cable for 10 variable-resistance transducers Cable for 10 variable-resistance transducers СКБ021.24.00.000 For checkout of resistance-variable transducers of air-blast circuit breakers. Cable has 10 pairs of M5 screw end caps. Cable insulation - silicone (length – 2.5 m).
Shunt voltage measuring cable Shunt voltage measuring cable СКБ014.27.00.000 For measuring the voltage of user-defined shunt when measuring heavy currents. Range – ±75 mV. Equipped with М5 screw end caps. Rubber insulation (length – 5 m).
Ground wire Ground wire СКБ022.08.00.000 For PKV/U3 case grounding. Equipped with a ground clamp and screw end cap. Rated current – 50А (length – 1.75 m).
Attachment devices set Attachment devices set For attachment of DP12 and DP21 transducers to various Russian-manufactured high-voltage circuit breakers (clamps, boards, connector adapters, etc.).
VP2B-1V-2А cut-outs (4 pcs.) VP2B-1V-2А cut-outs (4 pcs.) For power source protection.
Variable-resistance transducer cable (2 pcs.) Variable-resistance transducer cable (2 pcs.) СКБ021.27.00.000 For measuring resistance of variable-resistance transducers. Equipped with М5 screw end caps. Cable insulation – silicone (length – 2.5 m).
Attachment devices set kit Attachment devices set kit СКБ121.06.02.000
Instrument carrying case Instrument carrying case СКБ121.06.00.000
Additional complete set (on order)
Photo Item, Index Application
Notebook Notebook PKV/U3 is a measuring unit, all findings of which are shown on the notebook. Moreover, a special program for PC allows controlling the instrument and performing more detailed analysis of diagnostics results.
A set of DP12 linear travel transducer (2 pcs.) A set of DP12 linear travel transducer (2 pcs.) СКБ012.00.000-02 Availability of two transducers allows measurement of linear travels of mobile parts of HV circuit breaker across three phases simultaneously (Passports and Calibration Certificates are enclosed). The range is 0÷900 mm. Resolution is 0.5 mm. To be used together with a measurement rod. The DP12 transducer is available in the Standard complete set of PKV/U3.0.
Tools and accessories for DP12 (2 pcs.) Tools and accessories for DP12 (2 pcs.) Should the PKV/U3.0 be completed with the "Set of DP12 linear travel transducers (2 pcs.)" the "Tools and accessories (fasteners + cable) set (2 pcs.)" shall be procured
A set of DP21 angular travel transducer (2 pcs.) A set of DP21 angular travel transducer (2 pcs.) СКБ009.00.00.000 Availability of two transducers allows testing the travel and speed parameters of HV circuit breakers across three phases simultaneously (Passport and Calibration Certificate are enclosed). Measurement range is 0 ÷ 360°. Resolution is 0.09°. The DP21 sensor (1 pcs.) is available in a standard set of PKV/U3.0.
Tools and accessories for DP21 (2 pcs.) Tools and accessories for DP21 (2 pcs.) Should the PKV/U3.0 be completed with the "Set of DP21 linear travel transducers (2 pcs.)" the "Tools and accessories (fasteners + cable) set (2 pcs.)" shall be procured.
Tools and accessories for DP12 and DP21 (2 pcs.) Tools and accessories for DP12 and DP21 (2 pcs.) Should the PKV/U3.0 be completed with two kits: "The DP12 linear travel transducers (2 pcs.)" and "The DP21 angular travel transducer (2 pcs.)", the "Tools and accessories set (fasteners + cable) (2 pcs.)" shall be procured.
Attachment devices set (for foreign-made circuit breakers) Attachment devices set (for foreign-made circuit breakers) For attaching of DP21 angular movement transducer to SF6 high-voltage circuit breakers manufactured by Siemens, ABB, Areva, etc.
Measuring stick Measuring stick СКБ012.03.00.000/-01 Measuring stick in a box. Used together with linear movement transducer DP12 (length - 550 mm or 1,000 mm // 700 mm in standard complete set).
Power cable adapter Power cable adapter СКБ010.25.00.000/-01/-02 Power cable adapter with a rectifier up to 32А (embodiment 2). Connecting to the network with a europlug. Temperature range: -25ºС ÷ +40ºС (length – 2 m, 5 m, 10 m).
Clamp meters Clamp meters СКБ026.21.00.000 For measuring currents of electromagnets and solenoids. Supplied complete with a coupler. Current of up to 600А (cable length – 2.5 m).
Cable for voltage measurement by Cable for voltage measurement by "Input 1" ("Input 2") channel СКБ021.28.00.000 For measuring voltage in the range between 0 ÷ 12 V and -6 ÷ +6 V. Equipped with М5 screw end caps (length – 2.5 m).
DP32.2 variable-resistance linear movement transducer DP32.2 variable-resistance linear movement transducer СКБ021.32.00.000 For measuring linear movements of moving parts of vacuum circuit breakers with open insulating housing in the range of 25 mm. Includes:
For fixing of DP32.2 transducer position behind the movable contact of the arch chute with diameter of up to 25 mm.
For fixing of DP32.2 transducer position behind the insulating frame of VVTE-M-10 vacuum circuit breaker pole.
Attaching clamp No.20 Attaching clamp No.20 СКБ010.17.00.000 Installed instead of housing below the drive for fixing of DP12 linear movement transducer to VGU and similar type high-voltage circuit breakers.
Fixing bracket No.22 Fixing bracket No.22 СКБ010.14.00.000 Installed on the axis of the main movable contact of VE or VES type high-voltage circuit breakers. After that DP21 linear movement transducer is attached to the brackets.
Nozzle No.12 Nozzle No.12 СКБ009.11.00.000 For installation of DP21 linear movement transducer on VT or VTD type (or other type) high-voltage circuit breakers.
Manipulating rod Manipulating rod СКБ110.41.00.000
СКБ110.41.00.000-01
СКБ110.41.00.000-02
The rod is designed to ensure convenient connection to contacts of a HV circuit breakers.

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.

  • Manipulating rod for equipment of up to 35kV (2.2 m);
  • Manipulating rod for equipment of up to 110kV (3.7 m);
  • Manipulating rod for equipment of up to 220kV (5.1 m);
Safety Test Certificate IEC 61010-1:2001 on the PKV/U3
EMC Compatibility IEC 61326-1:2005 on the PKV/U3
PKV/U3 is included in Russian Register of Innovative Products under #230, valid until 12.10.2018.
PKV/U3.0 and PKV/U3.1 is included in Russian State Register under #63774-16, valid until 25.04.2021
PKV/U3 - EAC № RU Д-RU.ME97.B.00020; valid until 26.08.2019.
Testimonials about Micromillikilloohmmeter MIKO-2.3, PKV/U3.0, PKV/U3.1
BRANCH OF PAO FSK EES WEST SIBERIAN COMPANY OF MAIN ELECTRIC NETWORKS

Our company has been using 36 different instruments for more than 10 years, namely: MIKO-1, MIKO-2.3, PKV/M7 that are competed with linear and angular displacement transducers DP12, DP21, PKV/V3А, PKV/U3.0, PKV/U3.1, and PUV-50.

Those instruments are used for testing different connections of substation equipment, for controlling the parameters of high-voltage circuit breakers and disconnectors of 6-500 kV voltage classes.  The devices are simple and easy to operate. The function of automatic construction of oscillograms following the results of measurements is a great merit of the instruments.

In the course of the power equipment operation the instruments many times detected different incipient defects thus preventing equipment failures and possible subsequent emergencies.

The instruments can be recommended to companies operating high-voltage equipment.

Testimonials about PKV/U3.0
OJSC ENEX

The PKV/U3.0 analyzer has been in use in our company since 2012. During this period the analyzer was used during commissioning for testing SF6 circuit breakers of 110, 220, 500 kV manufactured by EMZ, Areva, Siemens, Hyundai. The analyzer is rather convenient in operation and in transportation, interface of the "PKV" software is rather user friendly.

Up to now we have been used the following functions of the analyzer: Measurement of circuit breaker (CB) operation time; measurement of circuit breaker operation speed; measurement of pole contacts tripping/opening delay; measurement of the time of closed status of CB pole contacts in the CLOSE/OPEN cycle; measurement of time of a contact-free phase in the OPEN/CLOSE/OPEN cycle; measurement of control electric magnets currents.

Considering friendly operation of the instrument, its functionality, reliability and cost as compared to its analogues, the PKV/U3.0 analyzer can be recommended for use at energy facilities. 

Testimonials about PKV/U3.0
CJSC "ZETO" - PLANT OF ELECTROTECHNICAL EQUIPMENT

The PKV/U3 instrument has been used by our Company since 2010. This Instrument allows control of the main parameters of HV circuit-breakers of VGT-110 type during acceptance tests.

The PKV/U3 instrument is easy to operate; program interface is user-friendly and understandable. We use such functions of the instrument as measuring the rate of the circuit-breaker closing/reclosing, time delays in the phase disconnection, time proper of closing/reclosing, maximum currents of electric magnets during actuation.

Owing to its convenience, functionality, reliability and relatively low cost as compared to its analogues, the instruments can be recommended for use at energy facilities.

Testimonials about PKV/U3.0
EKIBASTUZ GRES-1

In September 2011 we (Ekibastuz GRES-1) procured a PKV/U3.0 instrument for high-voltage circuit breakers testing.

During operation the instrument demonstrated good performances. It perfectly suits the adjustment of air circuit breakers (VNV-500, VVD-220, VVU-110, and VVG-20) used at Ekibastuz GRES-1 (Ekibastuz Thermal Power plant) as during pre-commissioning tests both discrete and analogue signals should be deenergized. A large number of channels, availability of remote start-up, comparatively small weight and availability of connection circuits for different types of high-voltage circuit breakers facilitate the instrumnet use.

Testimonials about PKV/U3.1, PKV/U3.0
CJSC IRKUTSENERGOREMONT

In 2004 prior to maintenance period our Company procured PKV/U2 instrument manufactured by SKB EP. During the maintenance period of 2004-2006 we performed a large number of repairs of high-voltage circuit breakers and each time for the circuit breaker testing we used PKV/U2 instrument. During maintenances we checked circuit breakers U-220, MKP-110, VMT-220, VMT-110, VKE-10, and VMPE-10.

In 2006 we decided to procure a new instrument PKV/U3 of SKB EP manufacture for testing the high-voltage circuit breakers VVM-500 and VVD-220 (PKV/U3 is designed for a larger number of tests than PKV/U2).

During maintenance periods of 2006-2009 we checked MKP-110, U-220, VVM-500, and VVD-220 circuit breakers. In 2008 using the PKV/U2 instrument we checked newly mounted high-voltage circuit breakers GL-317 of AREVA firm.

PKV/U2 and PKV/U3 instruments are easy to operate as detailed and extended manuals are provided. Connection of the instruments for the circuit breaker test is rather simple. Insulation of control wires is of rather high quality and is provided for different climatic conditions. The instruments are very reliable.

Simplicity of operation and functionality of PKV instruments are their main merits.

Testimonials about PKV/U3.0, PKV/U3.1
KEGOS Central Intersystem Electric Networks, a branch of Kazakhstan Electric Networks Management Company

The PKV/U3 Instrument has been used by our personnel since March 2008. Use of this instrument raised the quality of maintenances assessment since design of the instrument allows check of practically every rated parameter of a circuit breaker (time proper of switching on/off; pass in contacts; time delay for contacts closing/reclosing; forcing in; contacts bounce, etc.).

It should be specially noted that the instrument kit includes a notebook that allows assessment of the maintenance quality immediately after the measurements with the help of curves and diagrams on the screen, and reveals concealed defects of certain parts of a circuit breaker. Ability of the instrument to measure "Open" and "Close" current consumed by electromagnet windings reveals concealed defects in the electromagnet windings.

One of the advantages of the PKV/U3 instrument is that the number of channels for reading the time and speed characteristics of the VV-500B circuit breaker allows their recoding throughout the pole instantaneously.

Software of the notebook is user-friendly and at the same time multifunctional. It incorporates all the functions required for reading the time and speed characteristics, particularly: manipulation of PKV/U3 instrument, review of the measurement results in the tabular and graphic (colored) form, storage of the data obtained on a hard disk, creation of a data base of measurements performed, printing out the reports.

In view of the fact that much attention has lately been paid to assessment of the equipment state for making a decision on its shutdown for maintenance, the use of PKV/U3 instrument for non-destructive testing of internal parts of a circuit breaker reduces the scope of maintenance works and facilitates identification of circuit breakers that need urgent repair.

Testimonials about PKV/U3.1, PKV/U3.0
OJSC Elektrosetservis ENES

OJSC Elektrosetservis ENES has been intensively using instruments manufactured by SKB EP, namely PKV/U3/M6N, for testing the high-voltage circuit breakers since 2005. The instruments are reliable, convenient in operation and are of practical value. The percent of instruments failure during their operation was minimum, and much lower than that of their analogue SOVA-2.

Their benefits, in our opinion, are the ability to print time characteristics during circuit breaker oscillography, their simple design, convenient assembly owing to a small number of contact cables and lack of additional units.

Articles (6)
Diagnosis of HV circuit breakers state. The PKV/U3, a universal instrument in two modifications
Diagnosis of HV circuit breakers state. The PKV/U3, a universal instrument in two modifications
During installation and adjustment of HV circuit breakers, switch gears (KRUE, KRU, KRUN, and KSO) and in the course of their subsequent maintenance their rated characteristics need to be tested, namely, time, speed, travel, current and voltage.
SKB EP instruments: advanced technologies serve power industry
SKB EP instruments: advanced technologies serve power industry
The SKB EP Company have been developing and manufacturing analyzers for power industry. A family of instruments for HV circuit breaker testing that are manufactured today includes four analyzers: PKV/M6N, PKV/M7, PKV/U3.0, and PKV/U3.1.
Reviews (2)
Comparison of instruments for control of high-voltage circuit breakers produced by SKB EP
Comparison of instruments for control of high-voltage circuit breakers produced by SKB EP
Different methods are used for assessing the state of HV circuit breakers, whereas special instruments, such as PKV/M6N, PKV/M7, and PKV/U3 considerably facilitate and accelerate the diagnosis.  These instruments allow recording the time and speed characteristics of HV circuit breakers, and graphs of traverse move.
Integrated Testing of SKB EP Instruments
Integrated Testing of SKB EP Instruments
In early April, SKB EP specialists have conducted an integrated testing at 110/35/10 "Pivovariha" substation, where the following instruments have been used: instruments for control and testing of high-voltage circuit breakers; instruments for resistance measurement (microohmmeters and milliohmmeters) and instruments for control of transformer OLTCs.

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