FAQ KPM CBA01

The KPM CBA01 measures the dynamic characteristics of high-voltage circuit breakers on site: closing and opening time of up to 12 contacts, asynchronism between poles and breaks, bounce time and number of bounces, contact travel, clearance, overtravel and rebound, average speed, and speed at the instant contacts touch or separate.It also runs close-open, open-close and rated operating sequences (O-CO, CO-CO, O-CO-CO), low-voltage operation tests, and timing of contactors and relays. With a travel sensor fitted it records current-time, travel-time and speed-time curves.

Indoor and outdoor vacuum, SF6 and oil circuit breakers, including both low-oil and bulk-oil designs. You select the breaker type before each test, because it changes how speed is calculated.

From top left: the earth terminal and communication port; four groups of timing inputs (A1 B1 C1 to A4 B4 C4); the close, open and common control terminals with their fuse; the travel sensor input, external trigger input and stored-energy (spring charging) output; and the mains power socket and switches. On the right are the fast-connection socket, the printer and the colour touchscreen.Front panel: 1 earth and communication, 2 timing inputs, 3 control, 4-6 sensor, trigger and stored energy, 7 power, 8 fast connection, 9 printer, 10 touchscreen.

The analyzer, an accessory box, timing leads and extension leads, a 250 mm and a 25 mm linear sensor, an angle (rotary) sensor, a connecting rod, magnetic joint and magnetic movable frame, clip and holder, a three-clip shorting lead, the close/open control lead (red, green and black), an external trigger lead, a six-core sensor cable, earth lead, power lead, USB lead and five spare 10 A/250 V fuses.Sensors and mounting accessories supplied with the analyzer.

Connect the moving contact of every pole together and to the analyzer's earth terminal, then earth it reliably. Connect the fixed contact of each pole to the A, B and C inputs of a timing group. For breakers with several breaks per pole, use the further groups (2, 3, 4).Group 4 (A4, B4, C4) is the group used when a travel sensor is installed.Timing leads: fixed contacts to A, B and C; moving contacts joined and earthed.

The earth terminal protects both the analyzer and the breaker under test. Connect it to the station earth before anything else. When the breaker is tested isolated from the network, also connect the earth lead to the moving contact.

With the built-in supply, connect the analyzer's Close, Open and Common terminals to the breaker's closing coil, opening coil and common terminal. Common is the positive output; Close and Open are negative.With an external trigger, do not connect Close, Open and Common. Instead connect the external trigger input in parallel with the breaker's coil, so it sees the coil voltage as the start signal.Close, Open and Common terminals for the built-in coil supply.

Use the built-in supply where it can drive the breaker's coils, because it lets you set the exact voltage. If the built-in supply cannot meet the breaker's requirements, select External Trigger and operate the breaker from its own supply.Never wire the built-in supply and the external trigger at the same time.Choose Internal Power or External Trigger before the test.

An adjustable DC voltage from 0 to 265 V, up to 20 A, typed in on the touchscreen. Set it to the breaker's rated control voltage, or lower it for low-voltage tests. The stored-energy (spring charging) output covers the same 0 to 265 V DC range.

It is a 10-pin connector that carries the A, B, C and earth timing signals and the close and open control lines in one plug. With the matching lead, wiring a breaker takes a single connection. Do not use the fast connection and the separate panel sockets at the same time.Fast connection socket: timing, earth and control in one plug.

220 V AC ±10%, 50 Hz. A 10 A fuse sits inside the power socket. Use the supplied power lead, and earth the analyzer whenever it is in use. If it does not start when switched on, check this fuse first.

Connect the stored-energy output to the breaker's spring charging motor terminals. Open Stored on the touchscreen, set the DC output voltage, and switch on the stored-energy switch. The output gives the set voltage until the spring is charged.Set the spring charging output voltage.

A 25 mm linear sensor, a 250 mm linear sensor and an angle (rotary) sensor are supplied as standard. 300 mm and 1000 mm linear sensors are available as options for breakers with longer travel. Choose the one that suits the breaker's travel and the space around its mechanism, then select the same sensor in the test settings.Select the sensor that is fitted.

Mount it on a rotating shaft of the mechanism with the magnetic base or the clamp bracket and the connecting link. Because it measures angle, the analyzer needs a ratio to convert degrees into millimetres of contact travel.Set the ratio K1 to 1.00 mm/° and run a close or open test to read the angle C for the open clearance. Then the correct ratio is K2 = S ÷ C, where S is the breaker's standard open clearance. Enter K2 and test again.Angle sensor mounted on the magnetic base

Scale Test uses the actual displacement measured at the sensor's mounting position. Preset Travel lets you type in the breaker's standard travel by hand, when the sensor cannot be mounted where it sees the full contact movement.Scale Test or Preset Travel.

Open the cover of the arc chamber, pass the extension rod into the chamber and screw it into the moving contact's threaded hole. Couple the other end to the sensor so the sensor moves in the same direction as the moving contact, and fix the sensor to the chamber.Connect the sensor to the travel input. Wire the timing leads as usual: moving contacts to earth, fixed contacts to A, B and C.Oil breaker: extension rod, sensor and timing leads.

With the breaker open, fix the sensor to the support frame under the breaker and adjust the spring so the probe just touches the moving contact. Connect the probe lead to the External Trigger input, and the timing leads as for an oil breaker.Used this way, A1 records when the contacts separate and the External Trigger input records when the moving contact reaches its fixed point, so the analyzer can show the moving contact's operating time.Vacuum breaker: sensor under the breaker, timing leads to each pole.

Remove the glass window of the operating rod housing, fix the sensor mounting plate into the screw holes, set the linear sensor in position, and adjust it so it slides freely up and down with the rod. Wire the timing leads as for the other breaker types.SF6 breaker: linear sensor on the operating rod.

Tap Close Test and check each setting: breaker type, sampling time, average speed definition, instant speed definition (not for vacuum breakers), sensor, and power type and output voltage. Then tap Run.An open test is set up the same way from Open Test.Close test settings: breaker type, test time, speed definitions, sensor and voltage.

The sampling time is how long the analyzer records after the command. 300 ms covers most circuit breakers. Increase it only for slow breakers or long sequences.

Set the time window before closing and after opening over which the average speed is calculated. 6 ms is the usual setting. Follow the breaker manufacturer's speed definition where it gives one, because different breakers define speed differently.Average speed window before close and after open.

It defines the window used to calculate speed at the instant the contacts touch (closing) or separate (opening), typically the average over 10 ms before touching or after separating. It does not apply to vacuum breakers.

Tap C-O Test, choose C-O or O-C, then set the test time (sampling time for each operation) and the delay time between the two operations. Tap Run.C-O / O-C test: test time and delay time.

Tap Sequence and choose O-CO, CO-CO or O-CO-CO. Set the dead times t and t′ between operations, then tap Run. The test shows whether the breaker completes the whole sequence.O-CO-CO sequence with dead times t and t′.

Tap Low V. Test. Set the starting voltage and the percentage, then use the arrows to step the voltage and percentage by the gaps you set. Tap Close or Open to operate the breaker at each level and find the lowest voltage at which it still operates reliably.Low-voltage test: step voltage and percentage, then Close or Open.

Tap Breaks. The screen shows the live open or closed state of every timing input, so you can confirm the wiring before running a test.Breaks: live state of every timing input.

Tap the time on the main screen, then Set to change the date and time, and Enter to return. Language and the PC connection are under Setting.

A table with closing (or opening) time, bounce time and number of bounces for every break, plus asynchronism between phases and breaks. With a sensor fitted it also shows travel, clearance, overtravel, average speed and instant speed.From this screen you can save the result, print it, or view the curve.Result screen: times per break, asynchronism, travel and speed.

For close-open: closing time, delay time, opening time and close-open time. For open-close: opening time, delay time, closing time, dead time and open-close time.Close-open result.

Up to 20 groups of test results. When the memory is full, the newest result overwrites the oldest. Open Records to view or delete them, and upload important results to a PC before they are overwritten.Records: up to 20 stored results.

Yes. The built-in printer prints the result table and the curves. Tap Print on the result screen.

A Windows PC running Windows 7, 8, 10 or 11. The software, KPM CBStudio, needs no installation: unzip it to the hard disk and run KPM CBStudio.exe. To save reports in Word format, Microsoft Office must be installed.

Connect the analyzer to the PC with the USB lead. On the analyzer, open Setting and tap Connect. In the software, click Connect, then Upload to receive all stored results. Choose a result from the list on the left to see its curves and values. Read shows the last uploaded data again.PC software: uploaded travel curve and timing.

Click Export and choose Save as Word. The report holds the test settings (location, breaker name, test time, company, operator) and the results and curves. Click Print for a print preview, where you can set the page header and footer.Word report: test settings and result curve.

Check that the USB lead is firmly connected at both ends, that Connect is selected on the analyzer's Setting screen, and then click Connect in the software again.

Earth the analyzer and the breaker under test before connecting anything else. Use only the supplied power lead. Never connect the built-in coil supply and the external trigger together, or the fast connection together with the panel sockets.Follow your site's isolation and earthing rules, and keep clear of the breaker mechanism during operations.

Check the mains supply and the 10 A fuse in the power socket. Spare fuses are supplied in the box. If a new fuse blows again, stop and contact KPM.

Check the power type selected (built-in or external trigger) matches your wiring, that the control fuse on the panel is intact, that the output voltage suits the breaker's coils, and that the Close, Open and Common leads go to the right terminals with Common on the positive side.

Timing: up to 12 contacts, 0 to 6 s range, 0.01 ms resolution, 0.1 ms accuracy. Travel: 25 mm and 250 mm sensors as standard, 300 mm and 1000 mm optional; 0.001 mm resolution, 1 mm accuracy. Speed: 0 to 20 m/s. Built-in DC supply 0 to 265 V, up to 20 A. Mains 220 V AC ±10%, 50 Hz, under 60 W. Operating temperature 0 to 40 °C, humidity up to 90% RH. Size 460 × 340 × 200 mm, weight 10 kg.

The KPM CBA01 carries a one-year warranty. Warranty service is carried out at the KPM Service Center, so the analyzer is sent to and returned from the Service Center for warranty work. KPM also supports the analyzer after the warranty for repairs and calibration.

Call 0124 4001088 or email [KPM support email]. KPM Engineering Solutions Pvt. Ltd., 1210, 12th Floor, Unitech Arcadia, Sector 49, Gurugram 122018, Haryana. Send your saved result and a photo of the wiring for the fastest help.