SKB PKV-U3.1 断路器分析仪（20通道）

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.

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/U3.1 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.

High measurement accuracy when measuring time characteristics (±0.1 ms), as well as travel and speed characteristics is ensured by digital angular and linear movement transducers with the accuracy grade of 0.09° and 0.5 mm. Potentiometer-based transducers usually used in other instruments similar to PKV/U3.1 have poor accuracy (of up to 1%) even in normal conditions. With the maximum travel of 900 mm. it gives measurement uncertainty of ±9 mm.

PKV/U3.1 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 to:

• Keep a database of measuring results;
• Control the instrument from your computer;
• Store measurement templates;
• Show measuring results both in table and graphic form;
• Automatically calculate parameters of circuit breakers;
• Automatically apply circuit breaker phase movement graphs;
• Draw up reports (protocols) of measurement;
• Print out diagnostics data.

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.

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.

PKV/U3.1 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".