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
Oil
Vacuum
Sulfur-hexafluoride
Magnetic
Air		except VO-750, VO-1150, VNV-1150
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)
Control of angular travel of flexible elements of pole drive (360°)
Checking of air circuit breaker valve travel by means of variable-resistance transducers
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)
Checking of travel and velocity parameters simultaneously for three phases
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
Life tests of circuit breakers  (by circuit breaker manufacturer)
Determination of pole contact position
Checking of contact position with preswitched on resistors (due to special instrument operation mode)
Calculation of contact time difference
Calculation of bounce
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"
Испытание выключателей многократными опробованиями
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
Ability to make own circuit breaker measurement pattern
Availability of visual display for instrument settings for complete technical analysis of data and measurement graphs without a notebook
Interface for data control and transfer
RS-232 to connect to СОМ port
LAN to connect to local network or PC at large distances
Independent work of instrument without a notebook
PC software
Instrument control using notebook
Technical analysis of digital and graphical data (cursors, scaling, setting of graph displaying, automatic calculation of parameters)
Function of graph overlapping for visual analysis of differences in obtained data
AUTOmatic documenting of reports and report database maintenance
Measurement archiving on notebook and maintenance of different databases of instruments
Export of table data to Exel