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The device enables monitoring of time, travel, and speed parameters of moving parts of oil-blast, vacuum, air-blast, SF6, and electromagnetic circuit breakers up to 20 breaks as well as monitoring time characteristics of isolators and short-circuiting switches.
Additionally, PKV/U3.0 allows to register instantaneous values of currents and voltages of control electromagnets.
PKV/U3.0 is complete with attachment devices for the installation of measuring transducers on all types of high-voltage circuit breakers (ABB, AREVA, ALSTOM, SIEMENS, etc.).
Adaptability of the instrument involves designing of transducer attachments to the circuit breakers and receiving of transfer function of movement from the shaft to the cross-arm. If an attachment for a linear movement transducer is not provided at high-voltage equipment, you can use angular transducer with corresponding attachment devices 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 complex cycles.
There is a number of nuances at measurement performance. For example, while registering of time parameters of any high-voltage circuit breaker is quite a simple process, receiving of travel and speed parameters can be performed only with the use of special linear or angular movement transducers.
PKV/U3.0 is supplied with incremental (discrete) transducers for measurement of speed 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 cable-type transducers, for instance, have a limited upper value for speed. Return 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. In addition, the installation of the laser transducer is made approximately and without clamps. This leads to a high error of the measurements.
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 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.
PKV/U3.0 modification allows simultaneous control in three phases due to the possibility to equip the instrument with additional movement transducers. Standard complete set of PKV/U3.0 includes linear DP12 (1pcs.) and angular DP21 (1pcs.) movement transducers. In order to check parameters in 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.
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 numerical data are displayed on the PC (laptop) monitor in the form of a table with measured and calculated data for each cycle operation (when processing measurement results for complex cycles, the device automatically breaks down the cycle into simple operations).
The tables provide such data as:
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:
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.
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.
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 complex cycles "Open-Close", "Close-Open", "Open-Close-Open".
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 | |
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Voltage class of tested circuit breakers |
from 6 kV to 1150 kV |
from 6 kV to 500 kV |
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Circuit breakers subject to testing |
all |
all, except for VO-750, VO-1150, VNV-1150 |
| Number of variable-resistance transducer channels | 12 | 2 |
| Number of movement transducer channels | 3 | 1 |
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PKV/U3 is a measuring unit, all measurement results are shown on the laptop. Moreover, a special software for PC allows to control the instrument and perform more detailed analysis of diagnostics results. |
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Measuring stick in a case. Used together with linear movement transducer DP12 (length - 550 mm or 1,000 mm // 700 mm in standard complete set). |
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Availability of two additional transducers allows measurement of linear movement of moving of HV circuit breaker across three phases simultaneously (Passports and Calibration Certificates are enclosed). Range – 1 - 900 mm. Resolution is 0.5 mm. To be used together with a measuring stick. DP12 transducer (1 pcs.) is available in Standard complete set of PKV/U3.0. |
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Availability of two additional transducers allows testing the travel and speed parameters of HV circuit breakers across three phases simultaneously (Passport and Calibration Certificate are enclosed). Measuring range – 0.2 - 360°. Resolution is 0.09°. DP21 transducer (1 pcs.) is available in Standard complete set of PKV/U3.0. |
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For measuring voltage in the range between 0 - 12 V and -6 - +6 V. Equipped with М5 screw end caps. Rubber insulation (length – 2.5 m). |
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It is required for DC drive control of high-voltage circuit breaker at the local triggering. Power cable adapter with a rectifier up to 32 А (modification 2). Connecting to the network with a europlug. Temperature range: -25ºС - +40ºС (length – 5 m, 10 m). |
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For measuring linear movements of moving parts of vacuum circuit breakers with open insulating housing in the range of 25 mm. |
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For measuring currents of electromagnets and solenoids. Supplied together with a coupler. DC of up to 600 A, AC of up to 400 A. Cable length – 2.5 m. |
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For installation of DP21 angular movement transducer on VBP-10 and similar types of high-voltage circuit breakers. |
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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.
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Instrument and accompanying documents: Calibration Certificate, User Manual, Log Book, software. |
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For measuring of moving parts movement in high-voltage circuit breakers. Range – 1 - 900 mm. Resolution – 0.5 mm. Used together with a measuring stick. |
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Measuring stick in a case. Used together with linear movement transducer DP12 (length – 700 mm // on order – 550 mm and 1,000 mm). |
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For measuring of shaft turn angle in high-voltage circuit breakers. Measuring range – 0.2 - 360°. Resolution – 0.09°. |
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For connecting linear (DP12) or angular (DP21) movement transducer to the instrument. Cable insulation – silicone (length – 12 m). |
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For connecting to the poles of high-voltage circuit breaker. Equipped with crocodile clamps. Cable insulation – silicone. Jaw Ø - 30 mm (length – 11 m). |
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For remote triggering of measuring processes of the instrument. Cable should be connected to the drives of high-voltage circuit breaker electromagnet. Rubber insulation (length – 5 m). |
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For connecting to the high-voltage circuit breaker drive. Equipped with crocodile clamps. Nominal current – 50 А. Cable insulation – silicone (length – 5 m). |
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For commutated voltage supply. Nominal current – 50 А. Cable insulation – silicone (length – 2 m). |
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For connection to the contacts of air-blast high-voltage circuit breakers. Equipped with М4 screw end caps (length – 1.2 m). |
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For checkout of variable-resistance transducers of air-blast circuit breakers. Cable has 10 pairs of M5 screw end caps. Cable insulation - silicone (length – 1.2 m). |
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For measuring resistance of variable-resistance transducers. Equipped with М5 screw end caps. Cable insulation – silicone (length – 2.5 m). |
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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). |
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For connecting the instrument to the power supply. Temperature range – -25°С - +45°С. Rubber insulation (length – 2 m). |
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For PKV/U3.0 case grounding. Equipped with a ground clamp and screw end cap. Nominal current – 50 А (length – 2 m). |
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For connecting the instrument to the computer network or laptop (length – 2 m). |
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For connecting the instrument to the computer network or laptop (length - 1.5 m). |
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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 with crocodile clamps. |
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Type: VP2B-1V-2A (ВП2Б-1В-2А). For the power source protection. |
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Convenient, robust, wear proof bag for transportation of cables, documentation and other accessories to PKV/U3.0 instrument. |
SKB EP has completed testing of a new attachment device for angular movement transducer on ABB HGI3 circuit breaker with recalculation template.
10 march 2022
SKB EP team congratulates the beautiful ladies on the International Women's Day!
7 march 2022We hope that next time you will be able to participate.
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