Built-in 200 A micro-ohmmeter for static and dynamic resistance, and only 12 kg to carry
Timing, travel, coil, motor and resistance in one case
SA10A
Circuit breaker analyser
Twelve main contact channels, six auxiliary channels and a built-in micro-ohmmeter, in a metal case of 12 kg.
What it does
The analyser measures the contact timing of a circuit breaker, the travel of its mechanism, the current and voltage of coils and motor, and the resistance of the poles, in a single test. The evaluation logic separates the pre-insertion resistor contact from the main contact within the same operation, and the value of the pre-insertion resistor can be measured with a reference shunt.
Main features
- Twelve main contact timing channels and six auxiliary channels, which can also work as main contacts where induction is low.
- Three digital or analogue transducer inputs for travel, with a wide range of fastenings available.
- Built-in micro-ohmmeter that generates 200 A for static and dynamic resistance of the poles.
- Automatic measurement of coil and motor current and voltage, with an adjustable supply for the minimum function voltage test.
- First trip analysis: the breaker can be tested during an on-line operation, both on trip and on close.
- Full analysis of point-on-wave switching for capacitor banks and shunt reactors.
- No panel switches: two push buttons, open and close, and a backlit display.
Safety and portability
- Designed to work in switchyards with high induction, where lighter timers fail.
- Both-side earthed testing is supported with the companion earthing unit.
- Metal carrying case, 458 x 331 x 153 mm and about 12 kg.
Every measurement lands in the analysis software, which draws the travel curve and produces the test report.
Measurement and analysis
From the curve to the parameters
The software calculates the parameters that describe the mechanism from the recorded travel curve: total stroke, contact travel, over-travel, rebound and average speed, together with the timing of every contact. Curves and figures are stored in the same record, so operations can be compared over the life of the breaker.
Static and dynamic resistance
The built-in micro-ohmmeter injects 200 A and records the value automatically alongside the rest of the measurements. Dynamic resistance measurement shows how the pole behaves during the operation, which reveals the state of the arcing contacts without dismantling the chamber.
Analysis software
- Included with the analyser, for Windows, with report generation and export.
- Compatible with the manufacturer's factory line test equipment.
- Communication over RS-232 or USB; a wireless kit allows the computer to be up to 100 m away.
| Contact timing and travel inputs | |
|---|---|
| Main contacts | Twelve independent inputs marked A1 to A4, B1 to B4 and C1 to C4, at 48 V DC, with a maximum of 11 mA for loads between 24 and 48 V and 30 mA for loads between 0 and 24 V |
| Auxiliary contacts | Six independent inputs marked 1a, 1b, 2a, 2b, 3a and 3b, at 24 V DC with a maximum of 11 mA |
| Timing accuracy | 20 µs at a sampling rate of 50 kHz, on both main and auxiliary contacts |
| Maximum voltage | 250 V AC or 300 V DC between the red and black outputs |
| Travel inputs | Three inputs marked T1, T2 and T3, each usable as digital or analogue |
| Digital transducers | Two RS422 receivers for digital transducers, with the fastenings supplied for the mechanism under test |
| Analogue transducers | Analogue inputs for resistive and other travel transducers, with programmable scaling in the software |
| Coils, motor and resistance measurement | |
|---|---|
| Coil inputs | One analogue input marked Uc and COM, not fused, up to 300 V AC or DC and 32 A; measurement (0-300) V DC and (0-300) V AC with an accuracy better than 1 % or 1 V |
| Coil outputs | Two semiconductor controlled outputs marked CLOSE, OPEN and COM, supplied from Uc, with short-circuit current limit at 35 A or more; current measured from 0 to 45 A DC and 0 to 32 A AC with an accuracy better than 1 % or 0.1 A |
| Auxiliary voltage inputs | Two analogue inputs marked Uk and Ul, (0-300) V DC and (0-300) V AC, accuracy better than 1 % or 1 V |
| Motor input | One isolated analogue input marked Um, up to 300 V AC or DC and 32 A, measurement (0-300) V DC and AC with an accuracy better than 1 % or 1 V |
| Motor output | One constant isolated output marked MOTOR, supplied from Um; current measured from 0 to 90 A DC and 0 to 60 A AC with an accuracy better than 1 % or 0.1 A |
| Resistance measurement | Current generator of 200 to 210 A at 4 V DC for 200 ms; voltage measurement (0-225) mV DC with an accuracy better than 0.2 mV, current (0-240) A DC with an accuracy better than 2 A, and resistance from 0 to 1000 Ω with an accuracy better than 2 Ω |
| Analogue resolution | 14 bits on every analogue channel, that is, about 0.0275 mV per bit on the resistance voltage input, 15 mA per bit on the current output, 56 mV per bit on the voltage inputs and 5.7 mA per bit on the coil current |
Sampling, supply, interfaces and environment
| Sampling rates | Selectable from 10 Hz to 50 kHz; recording time ranges from 10.5 s at 50 kHz and 20.9 s at 25 kHz to 524 s at 1 kHz and over 52 000 s at 10 Hz |
|---|---|
| Mains supply | (100-240) V AC or DC at 50/60 Hz, 50 W maximum, through an IEC inlet filter with two 5 x 20 mm T3.15 A fuses |
| Internal battery | Lead accumulator of 12 V formed by two 6 V 5 Ah blocks, used for static and dynamic resistance measurement; charging at (13.5-14.0) V and 0.5 A, float voltage 13.6 V at 25 °C, service life up to eight years, protected by a 25 A panel-mounted fuse |
| Communication | RS-232 at 115.2 kbaud, 8 bits, no parity, one stop bit, and USB 1.1 or USB 2.0 full speed; both interfaces internally isolated; optional wireless kit for up to 100 m |
| Display and controls | Backlit LCD of four rows and twenty characters, and two push buttons, CLOSE and OPEN, which also perform a close-open operation when pressed together |
| Dimensions and weight | 458 x 331 x 153 mm, about 12 kg |
| Environment | Operating temperature (-20 to +40) °C; storage and transport (-40 to +40) °C; relative humidity (20-85) % non-condensing; operating altitude 2000 m and 12 000 m out of service |
| Overvoltage category | Category II |