Additionally, PKV/U3.1 allows you to register instantaneous values of currents and voltages of operation electromagnets.
Monitoring the technical condition of high-voltage circuit breakers of all types and voltage classes from 6kV to 500kVMore
Diagnostics of domestic and foreign circuit breakersMore
Wide ranges of time intervals (up to 8.1 sec), speed (up to 20 m/sec) and travel measurement (up to 900 mm)More
High measurement accuracyMore
Work with diagnostic results, device control and data transfer to PCMore
Table of measured and automatic calculations of the technical characteristics of high-voltage circuit breakersMore
More detailed information on the status of the circuit breaker can be extracted from the recorded schedulesMore
Monitoring of high-voltage circuit breakers in simple and compound cyclesMore
PKV/U3.1 is represented in two modificationsMore
PKV/U3.1 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.
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.
For measurements of speed characteristics and stroke parameters, high accuracy is provided by incremental (discrete) sensors of the type of angular and linear displacement with a resolution of 0.09 ° and 0.5 mm. The accuracy of the measurement of time characteristics is ± 0.1 ms.
Often used in other devices (analogs of the PKV / U3.1 device) potentiometer type sensors have a more (up to ± 1%) error even under normal conditions. For example, with a maximum stroke of 900 mm, such an error gives an uncertainty of ± 9 mm.
The PKV / U3.1 device is an measuring unit. All commands are given to it remotely via a PC (laptop) and special software (software), and the device carry out all the calculations.
Special software allows you:
Maintain a database of measurement results;
To operate the device from the computer;
Store measurement templates;
Display measurement results in tabular and graphical form;
Automatically calculate switch parameters;
Build charts and work with overlay tools;
To make reports (protocol) of measurements;
Print diagnostic data.
All diagnostic results of the object are displayed on a PC (laptop) monitor in the form of a table with measured and calculated parameters for each cycle operation (when processing the results of measuring complex cycles, the device automatically breaks the cycle into simple operations).
The tables provide data such as:
Stroke parameters (full stroke, stroke to contact closure, stroke, difference of responses along the course, bounce along the course, flight, rebound);
Time parameters (total time of circuit breaker closing, proper time of circuit breaker closing and pole turning on time);
Speed parameters (speed when turned on, contact timing different times and time bounce).
In addition to tables with measured parameters, more detailed information about the state of the circuit breaker can be extracted from recorded schedules, which are operated with cursors, overlays and scaling through special software on a PC (laptop).
The device is registered:
For example, the condition of the guide system cannot be estimated without the availability of graphs of the processes of moving moving parts.
In addition, it is difficult to determine from the numerical data which node is the reason for the delayed shutdown time. Here, the graph of the dependence of speed on the time of the shutdown process will give comprehensive information, since it can clearly divide the operating time of the drive from the operating time of the circuit breaker mechanisms.
One of the functions of the software is the automatic overlay of motion diagrams of the traverse phases of the circuit breaker, which makes it possible to accurately recognize such serious malfunctions as backlash of the pole mechanisms. This is especially important for circuit breakers with one drive for three phases. It is impossible to notice such a malfunction using only numerical data.
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.
Voltage class of tested switches
from 6kV to 1150kV
from 6KkV to 500kV
Circuit breakers subject to testing
all, except for VO-750, VO-1150, VNV-1150
|Number of variable-resistance transducer channels||12||2|
|Number of movement transducer channels||3||1|
|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.||1 (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|
|Interface and user's manual language||English|
|Calibration iperiod, year||3|
|Warranty period, year||3|
Instrument and accompanying documents: calibration certificate, operation manual, record book, software / user manual.
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 in a box. Used together with linear movement transducer DP12 (length – 700 mm // on order – 550 mm and 1,000 mm).
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°.
For connecting linear (DP12) or angular (DP21) movement transducer to the instrument. Cable insulation – silicone (length – 12 m).
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).
For remote start of measuring processes of the instrument. Connected to the drives of high-voltage circuit breaker electromagnet. Rubber insulation (length – 5 m).
For connecting to the high-voltage circuit breaker drive. Equipped with alligator type clamps. Rated current – 50А. Cable insulation – silicone (length – 2.5 m).
For commutated voltage supply. Rated current – 50А. Cable insulation – silicone (length – 2 m).
For connection to the contacts of air-blast high-voltage circuit breakers. Equipped with М4 screw end caps (length – 1.2 m).
For measuring resistance of variable-resistance transducers. Equipped with М5 screw end caps. Cable insulation – silicone (length – 2.5 m).
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).
For attachment of DP12 and DP21 transducers to various Russian-manufactured high-voltage circuit breakers (clamps, boards, connector adapters, etc.).
For connecting the instrument to the power line. Temperature range – 25°С ÷ +45°С. Rubber insulation (length – 2 m).
For PKV/U3 case grounding. Equipped with a ground clamp and screw end cap. Rated current – 50А (length – 1.75 m).
For connecting the instrument to the computer network or notebook (length – 2 m).
For connecting the instrument to the computer network or notebook (length - 1.5 m).
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.
For power source protection.
PKV/U3 is a measuring unit, all findings of which are shown on the laptop. Moreover, a special program for PC allows to control the instrument and perform more detailed analysis of diagnostics res
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 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.).
For measuring linear movements of moving parts of vacuum circuit breakers with open insulating housing in the range of 25 mm. Includes:
For measuring currents of electromagnets and solenoids. Supplied complete with a coupler. Current of up to 600А (cable length – 2.5 m).
For attaching of DP21 angular movement transducer to SF6 high-voltage circuit breakers manufactured by Siemens, ABB, Areva, etc.
For installation of DP21 linear movement transducer on VT or VTD type (or other type) high-voltage circuit breakers.
Installed instead of housing below the drive for fixing of DP12 linear movement transducer to VGU and similar type high-voltage circuit breakers.
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.
The rod is designed to ensure convenient connection to contacts of a high-voltage item.
branch of OJSC MRSK of North-West uses instruments manufactured by SKB EP, namely PKV/U2, PKV/U3.1, and MIKO-1. Types of circuit-breakers controlled by the Instruments include: VMT-110, VMT-150, MKP-110, VVSh-150, VT-35, and VM-35.
Specialists of our Company operating those instruments note their benefits:
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.
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.
The PKV/U3.1 (PKV/U3.0) instrument for non-destructive testing of HV circuit-breakers has been used by our personnel since July 2008. During this period all the types of circuit breakers installed at the substations of Federal Network Company that are serviced by Vologda Company of Main Electric Networks have been tested, namely: VVB-220, HPL-220, U-110, and MKP-110.
When purchasing this instrument we took into account positive experience of using previous versions of instruments for non-destructive testing of HV circuit-breakers (PKV-5, PKV-6, PKV-5M).
The use of PKV/U3.1 Instrument reduces time for HV circuit-breaker maintenances and raises the quality of works performed. The instrument allows check of practically every rated parameter of a circuit breaker (time proper of closing/reclosing at each pole; full time of traverse pass; time delay of contacts closing/reclosing; contacts bounce, traverse rebound and overshoot, voltage change at electric magnets, and many others).
The main advantages of the instrument are: small size, high accuracy of measurements, higher versatility as against its foreign analogues, a simple method for detecting the incipient defects, drawing up the defects lists without circuit breaker dismounting, possibility to connect the instrument to a computer, and immediate visualization of the HV equipment state.
We willingly recommend PKV/U3.1 and other SKB EP instruments for non-destructive control of HV circuit-breakers to all the companies dealing with servicing, maintenance, mounting and commissioning of high-voltage equipm
OJSC MRSK OF URALS has been intensively using instruments PKV-35, PKV/U3, PKV/M5, and PKV/M7 in its production activity.
PKV/M7 instrument has been used since September, 2008. The instrument is convenient is use, has low weight, friendly interface; it allows measurement of parameters of high-voltage circuit breakers 6-110 kV during diagnosis and maintenances. The instruments proved to be efficient for revealing, without dismantling, the deviations from rated parameters of equipment and for identification of the scope of maintenance work.
Graphic presentation of characteristics is rather vivid and gives the required information about the operation of elements and nodes of circuit breakers (drive operation, contact travel momentum, operation of buffers, dynamic time characteristics, etc.) during the whole cycle of measurements and at any time moment. Under availability of the results of previous checks one can get generalized estimates of the equipment condition and life remained. Thus, instrument allows non-destructive testing of circuit breakers, control of several nodes at a time with high sensitivity, and identification of the incipient defects at early stagesю
Still, there is an area for perfection of the instruments, software and manuals. Particularly, use of three linear sensors simultaneously instead of one sensor for recording the characteristics and for determination of time delay in the contact travel would considerably reduce the period of measurements.
On the whole the experience of the instruments operated proved their efficiency in the course of electric equipment maintenance and repair.
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.
OJSC ELEKTROAPPARAT has been intensively using instruments manufactured by SKB EP, LLC since 2005: PKV/U2, PKV/U3.1, PKV/M7, PUV-50, and MIKO-1 for adjustment of high-voltage SF6 circuit breakers during their commissioning and assembly.
Our company produces SF6 circuit breakers VGP-110, VGP-220, VGP-330, VB-110, VGG-20, cells YaGT-110, current transformers TGFM-110, TGFM-220, TGF-330, TGF-500, and voltage transformers ZNGA-110, and ZNGA-220.
With the help of PKV instruments our specialists perform non-destructive assessment of the circuit breaker condition, control several nodes simultaneously with high accuracy, which reduces the period of circuit breaker adjustment and time for documenting their acceptance. Graphic presentation of characteristics and parameters vividly demonstrate the operation of circuit breaker nodes.
PUV-50 instrument is used for life tests of manufactured and newly developed circuit breakers.
MIKO-1 instrument is used for measuring the transient resistances of circuit breaker contacts, and of current and voltage transformer windings. The instrument is compact, has high precision of measurements, simple in manipulation and convenient to use owing to its mobility and independent power supply.
СWe can willingly recommend the above instruments manufactured by SKB EP for units dealing with circuit breaker adjustment and operation.
During overhauls and maintenance of air circuit breakers of VVBK-500, VVB-500, VNV-500, and VV-50 type our Company uses the PKV-U3.1 instruments (2 pcs.) manufactured by your Company. The instruments have been in operation since 2009. They are rather convenient and simple in operation.
They ideally suit for companies dealing with adjustment and maintenance of electric equipment.
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.
We offer to consider the features of diagnostics using automatic monitoring systems (transducers) in real operating conditions and using specialized portable devices produced by SKB EP LLC, which require disconnection of voltage coming to the measured object, by the example of a high-voltage circuit breaker.21 may 2020
A distinctive feature of the SKB EP instruments is the ability to diagnose a circuit breaker without disassembling it, without draining the oil and disconnecting the shunt resistors, etc. Theyinspect all the mechanical parts and components of the circuit breaker at once, as well as check several characteristics of the assembly simultaneously.13 may 2020
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.3 september 2019
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.20 april 2019
We hope that next time you will be able to participate.
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