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PKV/M7 is designed for monitoring time, travel, and speed parameters of moving parts of oil, vacuum, SF6, and magnetic-type circuit breakers of all types, as well as for monitoring time parameters of isolators and short-circuiting switches.
Additionally, PKV/M7 allows you to register instant values of currents and voltages of control solenoid.
PKV/M7 instrument is complete with attachment devices for the installation of measuring transducers on all types of high-voltage circuit breakers (ABB, AREVA, ALSTOM, SIEMENS, Susol, 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. Transfer functions of kinematic chains of all circuit breakers are stored in the memory of the instrument. Adaptation work began with the first produced model of the instrument (PKV/М1) in 1995 and continues to this day.
For example, in similar devices, a shorter time range does not allow testing circuit breakers in complex cycles.
There are a lot of nuances when taking measurements on circuit breakers. It is easy to register time parameters for any type of circuit breakers, but special transducers are required to obtain travel and speed characteristics.
Incremental (discrete) type transducers are supplied together with the PKV/M7 device for measuring speed characteristics and travel parameters. They do not require adjustment or customization of conversion factors. Moreover, the transducers are accurate and easy to use.
For example, devices with cable-type transducers have a limit on the upper-speed value. The return spring does not have time to wind the cable onto the drum with rapid changes in speed. The measurement error increases. The use of laser movement transducers is not advisable because of the danger of eye damage from the laser beam during rough handling. In addition, the installation of the laser transducer is made approximately and without clamps. This leads to a high error of the measurements.
For measuring speed and travel parameters, high accuracy of measurements of time parameters (±0.1 ms), travel and speed characteristics is ensured with incremental (discrete) angular and linear movement transducers with a resolution of 0.09° and 0.5 mm.
Transducers that are often used in other devices (analogues of PKV/M7 device) are based on a potentiometer. And even under normal conditions they have a large error (up to ±1%). For example, with a maximum travel of 900 mm, such an error gives an uncertainty of ± 9 mm.
The diagnostic results are displayed in a table with measured and calculated parameters 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:
Apart from tables with measured parameters, more detailed information on circuit breaker status can be derived from recorded graphs that are navigated using cursors and scaling.
The instrument registers:
The type of graphs is determined by the state of all links (levers, springs, rods, axes, traverses, dampers, etc.) of the kinematic chain of the mechanism that controls the closing / opening of the circuit breaker contacts. And the occurrence of a malfunction in at least one of the links (increase in play, loosening of the spring, increased friction, failure of the damper, etc.) changes the form of the graph from the normal form of a working circuit breaker immediately. It allows to identify its current or incipient malfunctions at an early stage by using a non-demountable method.
PKV/M7 is equipped with a power control module to control drives of switching devices both DC and AC, and enables to perform both simple operations and complex cycles, including life tests.
PKV/M7 is an independent device for diagnostic and data analysis, which does not require third-party equipment.
All settings, calculations and graphics can be performed on a graphic b/w LCD display (320 x 240 pixels).
If you have to carry out diagnostic in difficult weather conditions you can be sure that PKV/M7 will provide you with the most accurate results as it operates properly in the temperature range from -15°С to +40°С.
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Measuring stick in a case. To be used together with linear movement transducer DP12 (length - 550 mm or 1,000 mm // 700 mm in standard complete set). |
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For connecting linear (DP12) or angular (DP21) movement transducer to the instrument. Cable insulation – silicone (length – 12 m // in standard complete set – 7 m). |
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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. Includes: |
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For measuring currents of electromagnets and solenoids. Supplied complete with a coupler. DC up to 600 A, AC up to 400 A (cable length – 2.5 m). |
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For connecting the instrument to the computer network or laptop (length - 1.5 m). |
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For PKV/М7 control from computer as well as for measurement data processing in a special software. |
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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 the movement of moving parts in high-voltage circuit breakers. Range – 1 - 900 mm. Resolution – 0.5 mm. To be used together with a measuring stick. |
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Measuring stick in a case. To be used together with linear movement transducer DP12 (length – 700 mm // on order – 550 mm and 1,000 mm). |
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For measuring the angle of shaft turn 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 – 7 m // on order – 12 m). |
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For connecting to the pole 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 test current – 50 А. Cable insulation – silicone (length – 5 m). |
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For commutated voltage supply. Nominal test current – 50 А. Cable insulation – silicone (length – 2 m). |
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For measuring resistance in the range between 0 - 240 Ω and 0 - 2.5 kΩ. Equipped with M5 screw end caps (length – 2.5 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/M7 case grounding. Equipped with a ground clamp and screw end cap. Nominal test 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 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-2А (2 pcs.) / VP2B-1V-10А (2 pcs.). For the power source protection. |
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Convenient, robust, wear proof bag for transportation of cables, documentation and other accessories to PKV/M7 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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