The device measures time, travel, and speed parameters of the moving parts of SF₆, oil, vacuum, and electromagnetic circuit breakers rated from 6 to 500 kV simultaneously across 3 poles and up to 6 breaks per pole, as well as the time parameters of isolators and short-circuiters.
The following measurements and operations can be performed simultaneously:
Response time measurement for main contacts and pre‑insertion resistors;
Current analysis of closing and tripping coils up to 30 A;
Measurement of station voltage up to 350 V DC and AC;
Displacement measurement using angular and linear displacement transducers.
PKV/M17 enables reliable measurement of the time, electrical, and kinematic characteristics of circuit breakers, ensuring effective diagnostics of their technical condition.
Parameter
PKV/M17M
PKV/M17
PKV/M7
PKV/M15M
SF6/oil/vacuum/electromagnetic
Switching test current, max
30 A
30 A
14 A
20 A
Number of discrete channels for monitoring circuit breaker contacts
6
6
4
3
Number of displacement transducer channels
3
3
1
1
First Trip mode
Control of pre-insertion resistors
Trip-free mechanism testing
Anti-pumping mechanism testing
Endurance tests of circuit breakers
PKV/M17M enables to measure the time parameters to closing / opening of the controlled contacts, isolators, and short-circuiters – simultaneously across 3 poles (up to two breaks per pole) or across 1 pole (up to 6 breaks per pole), in the range from 0.01 to 200 seconds at intervals of 0.05, 0.1, and/or 1 second.
In addition to monitoring time parameters, the PKV/M17M measures speed (up to 20 m/s) and travel (up to 900 mm) parameters of moving parts of circuit breakers using incremental (discrete) and rheostatic transducers.
In standard complete set:
Linear displacement transducer DP12 – for measuring the displacement of moving parts in high-voltage circuit breakers. Range – 1 - 900 mm. Resolution – 0.5 mm, accuracy ±1 mm.
Angular displacement transducer DP21 – for measuring the angle of shaft turn in high-voltage circuit breakers. Measuring range – 0 - 360°. Resolution – 0.09°, accuracy ±0.56
In additional complete set (on order):
Rheostat transducer DP32 – for measuring the linear displacement of vacuum circuit breakers with open insulated housing in the range 0.2 - 20 mm. Accuracy ±0.2 mm.
Note: When the device is equipped with three transducers of the same type, speed and travel parameters can be monitored simultaneously across 3 poles.
Depending on the task, the user can choose between an internal triggering method or one of the external triggering methods:
Based on the state of any auxiliary contact channel;
Based on the state of any pole channel;
Based on the setting of an analog channel (voltmeter channel, current measurement channels, current clamp channels);
Based on the status of the incremental displacement transducer.
PKV/M17M instrument is complete with attachment devices for the installation of measuring transducers on all types of high-voltage circuit breakers (ABB, AREVA, ALSTOM, SIEMENS, etc.).
If any specific attachment devices or measurement templates are required for your object, we are ready to participate in their development, manufacture and testing.
This ensures correct connection of the device and accurate measurements, even for equipment with a non-standard design.
PKV/M17M is equipped with a control module to operate both DC and AC switching devices, enabling both simple single operations and complex cycles at electromagnet currents of up to 30 A.
PKV/M17M uses a control module to conduct endurance tests of circuit breakers during commissioning and maintenance.
This mode involves repetitive testing of the switching device with automatic recording of its characteristics after a specified number of cycles. This allows users to assess the circuit breaker’s mechanical and electrical durability, as well as its performance during long-term operation.
This mode is one of the unique features of the new PKV/M17M,
which assesses the actual operating condition of a high-voltage circuit breaker after a long period of inactivity.
The function simulates an actual emergency trip (or scheduled shutdown) following a prolonged period of inactivity. This mode allows users to identify changes in the characteristics of the drive mechanism and switching system that may occur during prolonged operation or when the equipment is stored without use.
The position and operating timing of the circuit breaker are determined using current clamps. There is no need to connect directly to the main contacts or control circuits. This method provides safe and convenient testing, allowing to obtain reliable data on the circuit breaker's real operating condition.
This feature is currently under development. For devices purchased in 2026, the feature can be activated remotely via a software update without returning the device to the manufacturer.
PKV/M17M checks the operation of the circuit breaker’s automatic trip-free mechanism under a simulation of critical operating conditions.
The trip-free mechanism check function is designed to evaluate the circuit breaker’s ability to reliably open at any point during the closing process, including emergency situations.
The trip-free mechanism ensures that the circuit breaker opens regardless of the position of the moving contacts. This is particularly critical during short-circuit closing: when the protections are triggered, the circuit breaker must be guaranteed to open and not remain in the closed or intermediate position.
Control is carried out along the travel path of the moving contacts during closing – from the moment the primary circuit closes until full closure.
The test results confirm that the opening parameters comply with the requirements of the Electrical Installation Code regarding current and trip time, which ensures safe and reliable operation of the circuit breaker during overloads and short circuits.
PKV/M17M has a specialized test mode designed to check the correct operation of the circuit breaker's anti-pumping mechanism while maintaining the closing signal.
This function prevents repeated automatic reclosing attempts when a steady signal is present, such as in the case of a short circuit.
During the test, the operation of the blocking mechanism is checked
to ensure that it prevents cyclic operation of the actuator when the close signal remains active.
The test confirms that the anti-pumping protection operates correctly, thereby preventing damage to the circuit breaker and ensuring safe operation of the equipment.
The object diagnostic results are displayed as data with measured and calculated parameters for each operation of the cycle. When processing measurement results for complex cycles, the device automatically breaks the cycle down into simple operations.
The results include such data as:
Travel parameters: stroke, travel until pole contacts closing, contact wipe, pole discrepancy, bouncing in travel, overtravel, rebound.
Time parameters: circuit breaker opening time, circuit breaker closing time and pole closing time, time difference in contact response, and bouncing in time.
Speed parameters: closing speed, and speed calculations for different sections.
Using special templates, the user can specify the nominal values for the measurement object. If the measured value differs from the nominal value, the device will highlight it.
More detailed information on the circuit breaker status can be derived from recorded graphs, that are navigated using cursors and scaling.
Specifications
Value
Number of control channels of circuit breaker contacts
6
Measuring and recording range of time intervals
0.001 – 200 s
Accuracy
±10-4[1 + tx] s, where tx is the measured time interval
Measuring range of linear displacement
1 – 900 mm
Accuracy
±[1+0.0005*Sx] mm, where Sx is the measured distance
Measuring range of angular displacement
0.2° – 360°
Accuracy
±[0.2 + 0.001*ax]°, where ax is the measured angle
Measuring range of speed
0.002 – 20 m/s
Accuracy in the range of 0.02-10 m/s
±2 %
Power switch cycles
O, C, O-P-C, C-Tdo-O, O-P-C-Tdo-O P - optional pause Tdo - time delay of open
Maximum switching current
±30 A
Input voltage measurement range "Control module voltage"
350 V
Voltage measurement range by "Analog input" channel"
0 – 12 V (unipolar mode) ±6 V (bipolar mode)
Resistance measuring range by "Analog input" channel"
0 – 160 Ω (output current 60 mA) 0 – 2500 Ω (output current 4 mA)
Instrument and additional documents: Calibration Certificate, User Manual, Log Book.
Angular displacement transducer DP21
009.00.00.000
Angular displacement transducer DP21
009.00.00.000
For measuring the angle of shaft turn in high-voltage circuit breakers. Measuring range: 0.2 – 360°. Resolution: 0.09°.
Linear displacement transducer DP12
Linear displacement transducer DP12
For displacement measurement of moving parts in high-voltage circuit breakers. Range: 1 – 900 mm. Resolution: 0.5 mm. To be used together with a measuring stick.
Measuring stick
012.03.00.000-02
Measuring stick
012.03.00.000-02
Measuring stick in a case. To be used together with linear displacement transducer DP12 (length on order – 550 mm, 700 mm and 1,000 mm).
Attachment devices set to install transducers on circuit breakers
Attachment devices set to install transducers on circuit breakers
For attachment of DP12 and DP21 transducers to various types of circuit breakers.
Transducer cable
047.20.00.000
Transducer cable
047.20.00.000
For connecting linear (DP12) or angular (DP21) displacement transducer to the instrument. Length: 7 m.
Pole cables
047.11.00.000К
Pole cables
047.11.00.000К
For connecting to the pole of high-voltage circuit breaker. The cable is equipped with Сrocodile clamps. Length: 7.5 m.
Control unit cable
047.19.00.000К
Control unit cable
047.19.00.000К
For connecting to the control circuits of a high-voltage circuit breaker. Length: 5 m.
Mains cable
018.09.00.000
Mains cable
018.09.00.000
Mains cable 1 x 2 m. For instrument connection to the mains. Temperature range: -25°C to +45°C. Rubber insulation.
Voltmeter cable
047.10.00.000
Voltmeter cable
047.10.00.000
For measuring voltage in the control circuits of a high-voltage circuit breaker. Length: 5 m.
Ground cable
010.01.00.000
Ground cable
010.01.00.000
Ground cable 1 x 2 m (0.07 kg) for instrument grounding. The cable is equipped with a C-clamp and a screw end cap. Rated current is 50 А.
LAN cable
024.26.00.000
LAN cable
024.26.00.000
For connecting the instrument to the computer network or laptop. Length: 2 m.
Fuse 0505020 МХЕР (2 pcs.)
Fuse 0505020 МХЕР (2 pcs.)
For the drive control connectors.
Fuse VP2B-1V-2 А (2 pcs.)
Fuse VP2B-1V-2 А (2 pcs.)
For the power source protection.
Tool bag
147.06.00.000
Tool bag
147.06.00.000
Convenient, robust, wear proof bag for transportation of cables, documentation and other accessories.
Additional complete set for simultaneous monitoring across 3 phases (on order):
Photo
Item, Index
Application
Angular displacement transducer DP21 (2 pcs.)
009.00.00.000
Angular displacement transducer DP21 (2 pcs.)
009.00.00.000
Two additional transducers (DP12 and/or DP21) allow you to simultaneously measure the travel and speed parameters of the circuit breaker across all 3 phases (includes Log Book and Calibration Certificate). Measuring range: 0.2 – 360°. Resolution: 0.09°. Standart complete set includes DP21 transducer (1 pc.).
Linear displacement transducer DP12 (2 pcs.)
012.00.00.000
Linear displacement transducer DP12 (2 pcs.)
012.00.00.000
Two additional transducers (DP12 and/or DP21) allow you to simultaneously measure the travel and speed parameters of the circuit breaker across all 3 phases (includes Log Book and Calibration Certificate). To work with transducers, measuring sticks are required (see below). Range: 1 – 900 mm. Resolution: 0.5 mm. Standart complete set includes DP12 transducer (1 pc.).
Measuring stick (2 pcs.)
012.03.00.00/-01/-02
Measuring stick (2 pcs.)
012.03.00.00/-01/-02
Two additional measuring sticks are required when using DP12 transducers for displacement measurement of moving parts in high-voltage circuit breakers across all 3 phases simultaneously.
Measuring stick in a case. Length on order – 550 mm, 700 mm and 1,000 mm. Standart complete set includes 1 measuring stick 700 mm.
Transducer cable (2 pcs.)
047.20.00.000-01/-02
Transducer cable (2 pcs.)
047.20.00.000-01/-02
For connecting linear (DP12) or angular (DP21) displacement transducer to the instrument. Standard complete set includes 1 pc. Length: 7 m.
Additional complete set (on order)
Photo
Item, Index
Application
Rheostat transducer DP32
026.22.00.000
Rheostat transducer DP32
026.22.00.000
For measuring the linear displacement of vacuum circuit breakers with an open insulating housing in the range of 0.2 – 20 mm. Accuracy is ±0.2 mm. It is used complete with adapter 026.24.00.000.
Pole cable
047.11.00.000К
Pole cable
047.11.00.000К
Additional pole cables 7.5 m with jaw up to 50 mm for circuit breakers with two open circuits per phase.
Pole cable extension
058.07.00.000К
Pole cable extension
058.07.00.000К
A set of extensions to lengthen standard complete set pole cables. Length: 5 m.
Drive power supply
053.13.00.000
Drive power supply
053.13.00.000
For controlling DC and AC drives during internal triggering and spring winding in high-voltage circuit breaker drives. Supplied together with cable 047.19.00.000 (2 pcs.). Length: 5 m.
Auxiliary channel cable
047.23.00.000
Auxiliary channel cable
047.23.00.000
"For recording the moments when electrical voltage is applied/removed, and for the closing/opening moments of various contacts on the circuit breaker drive.
Length: 5 m"
Auxiliary channel extension cable
047.24.00.000
Auxiliary channel extension cable
047.24.00.000
For placing the PKV/M17 device more than 5 meters away from the circuit breaker drive. Length: 5 m
Transducer cable extension
047.18.00.000К
Transducer cable extension
047.18.00.000К
For extending the length of the transducer cable. Length: 5 m.
Attachment devices set to install transducers on circuit breakers
Attachment devices set to install transducers on circuit breakers
Additional attachment devices for attaching DP12 and DP21 transducers to all 3 phases simultaneously (clamps, mounting plates, adapters, etc.).
Can be purchased separately or on order.
Calibration cable for analog transducers
047.41.00.000
Calibration cable for analog transducers
047.41.00.000
Cable 1 x 1.5 m for calibrating analog transducers channels is designed to check the metrological characteristics of the analog transducers channels on the PKV/M17 instrument during testing or calibration.
Attachment devices set kit
126.06.02.00
Attachment devices set kit
126.06.02.00
Tool bag for attachment devices
Recommended accessories:
Photo
Item, Index
Application
Manipulating rod
010.41.00.000К
Manipulating rod
010.41.00.000К
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 3.3 m. 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.
Manipulating rod - 2.2 (length 2.2 m / weight as an assembled set 3.4 kg);
Manipulating rod - 3.7 (length 3.7 m / weight as an assembled set 4.0 kg);
Manipulating rod - 5.1 (length 5.1 m / weight as an assembled set 4.6 kg).
Official reviews from customers based on the results of operating SKB EP instruments are available upon request. Please, fill out the form on the website.
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