Description

Monitoring the technical condition of high-voltage circuit breakers up to 4 breaks PKV/М7 is designed for measuring characteristics of SF6, oil, magnetic-type and vacuum high-voltage circuit breaker of all types and manufactures (such as ABB, AREVA, ALSTOM, SIEMENS etc.), and of isolators and short-circuiting devices. Additionally, PKV / M7 allows you to register instantaneous values ​​of currents and voltages of control electromagnets. Diagnostics of domestic and foreign circuit breakers PKV/M7 instrument is complete with attachment devices for the installation of measuring transducers on all types of Russian- and foreign-manufactured (ABB, AREVA, ALSTOM, SIEMENS, etc.) high-voltage circuit breakers. 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. Sufficient measuring ranges for time (up to 5.2 s), speed (up to 20 m/s) and travel (up to 900 mm) intervals For example, in similar devices, a shorter time range does not allow testing circuit breakers in complex cycles. There are many nuances when taking measurements on circuit breakers. It is easy to register time characteristics for any type of circuit breakers , but special sensors are required to obtain stroke and speed characteristics. Incremental (discrete) type sensors are supplied together with the PKV/M7 device for measuring speed characteristics and stroke parameters. They do not require adjustment or customization of conversion factors. Moreover, the sensors are accurate and easy to use. For example, devices with cable-type sensors 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 inaccuracy of measurement increases. The use of laser displacement sensors is not advisable because of the danger of eye damage from the laser beam during rough handling. In addition, the installation of the laser sensor is made approximately without clamps. This leads to a high inaccuracy of the measurements. High measurement accuracy For measuring speed and stroke parameters high accuracy of measurements of time characteristics (±0.1 ms), travel and speed characteristics is ensured with digital angular and linear movement pickups with resolution in 0,09° and 0.5 mm. Often used in other devices (analogs of the PKV/M7 device) sensors based on a potentiometer even under normal conditions have a large (up to ± 1%) inaccuracy. For example, with a maximum stroke of 900 mm, such an inaccuracy 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: 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).

The instrument registers: dependence of spe­ed on time and travel; dependence of currents and voltages of electromagnets on time and travel; diagrams of clo­sing/opening processes of the contacts.

Monitoring of high-voltage circuit breakers in simple and compound cycles Equipped with a power switchboard to control drives of switching devices, both DC and AC, and enables to perform both simple operations and complex cycles, including life tests. Work with diagnostic results, device control and data transfer on PC PKV / M7 is an independent device for diagnostics and data analysis, which does not require third-party equipment. All settings, calculations and graphics are on a graphic b/w LCD display (320x240). Proper operation in all weather conditions If you have to carry out diagnostics 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 -20 to +40°С.