Comparison of instruments for control of high-voltage circuit breakers produced by SKB EP
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.
The PKV series instruments considerably reduce the time of complex tests, raise their quality and allow grounded elimination of unnecessary overhauls. Moreover, the PKV/M6N, PKV/M7, and PKV/U3 instruments allow detection of concealed defects that are known to be the most hazardous ones.
PKV/U3.0 | PKV/U3.1 | |
Types of controlled high-voltage circuit breakers |
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Oil |
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Vacuum |
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Sulfur-hexafluoride |
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Magnetic |
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Air |
except VO-750, VO-1150, VNV-1150 |
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General characteristic | ||
Number of controlled breaks |
20 | 20 |
Number of travel transducer channels |
3 | 1 |
Number of channels for travel control by variable-resistance transducer |
12 | 2 |
Availability of galvanic separation. Makes it possible not to consider which side of high-voltage circuit breaker is earthed |
+ | + |
Instrument operating temperature, °С |
-15...+40 |
-15...+40 |
Dimensions, mm |
300х140х400 |
300х140х400 |
Weight, kg |
10 | 10 |
Functions | ||
Control of linear travel of moving elements of pole drive (up to 900 mm) |
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Control of angular travel of flexible elements of pole drive (360°) |
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Checking of air circuit breaker valve travel by means of variable-resistance transducers |
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AUTOmatic conversion of angular transducer data to parameters of travel and velocity of contacts (if there is no opportunity to control travel by linear transducer) |
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Checking of travel and velocity parameters simultaneously for three phases |
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Monitoring of characteristics of circuit breaker control electromagnets | ||
Control of uninterruptible power supply voltage in the circuit breaker switching mode – checking of the status of the uninterruptible power supply batteries |
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Life tests of circuit breakers (by circuit breaker manufacturer) |
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Determination of pole contact position |
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Checking of contact position with preswitched on resistors (due to special instrument operation mode) |
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Calculation of contact time difference |
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Calculation of bounce |
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Maximum switched current, A |
35 | 35 |
Testing of trip-free release mechanism of circuit breaker in the programmed complex cycles "Open-Closed", "Closed-Open", "Open-Closed-Open" |
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Испытание выключателей многократными опробованиями |
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Technical characteristics | ||
Measuring and recording range for time intervals, s |
0.004 ÷ 8 |
0.004 ÷ 8 |
Time interval measurement error, ms. |
±0,1 ... ±0.3 |
±0,1 ... ±0.3 |
Travel speed measuring range, m/s |
0.002 ÷ 20 |
0.002 ÷ 20 |
Limit of allowable relative velocity measurement error, m/s |
±2 |
±2 |
Range of linear movement measurement with transducer DP12, mm |
0.5 ÷ 900 |
0.5 ÷ 900 |
Resolution of linear movement measurement with transducer DP12, mm |
0.5 |
0.5 |
Range for angular movement measurement with transducer DP12, degree |
0.09 ÷ 360 |
0.09 ÷ 360 |
Resolution of angular movement measurement with transducer DP12, degree |
0.09 |
0.09 |
User interface | ||
Built-in measurement templates to facilitate the instrument settings for specific models of circuit breakers |
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Ability to make own circuit breaker measurement pattern |
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Availability of visual display for instrument settings for complete technical analysis of data and measurement graphs without a notebook |
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Interface for data control and transfer | ||
RS-232 to connect to СОМ port |
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LAN to connect to local network or PC at large distances |
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Independent work of instrument without a notebook |
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PC software | ||
Instrument control using notebook |
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Technical analysis of digital and graphical data (cursors, scaling, setting of graph displaying, automatic calculation of parameters) |
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Function of graph overlapping for visual analysis of differences in obtained data |
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AUTOmatic documenting of reports and report database maintenance |
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Measurement archiving on notebook and maintenance of different databases of instruments |
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Export of table data to Exel |
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