ISA CBA1000 - 1 Introduction

Doc. CEI12166 Rev. 1 Pag. 5 Of 47
1 INTRODUCTION
The circuit breaker analyzer and micro-Ohmmeter model CBA1000 is a two-in-one test set.
When used as a circuit breaker analyzer, it allows the off-line testing of the characteristics of all modern
MV and HV circuit breakers.
When used as a micro-Ohmmeter, it allows measuring the contact resistance of the circuit breaker
contact, or also of joints or other circuit parts. It allows also to perform the dynamic test of the contact
resistance, that is to record and display how does the contact resistance change while it is closing: this
allows detecting hidden defects, that are otherwise impossible to be diagnosed.
The instrument performs the following features:
. Test set control: via keypad plus selection knob plus dedicated keys, and a large transflective LCD
display (320 x 240 pixels; view area 122 x 92 mm).
. Optional internal thermal printer 58 mm wide or external thermal printer 112 mm wide.
. Huge recording capability: 64Mb (typically 1000 results).
. USB and RS232 interface for data communication with the PC.
. Two driving coil circuits (O+C); 4 opt. The coil current is independently measured on all outputs, with
three current ranges.
. Three sets of two main contact sensing circuits (two chambers tests). Test of the main contact and of
the pre-insertion resistor.
. Four digital event input circuits.
. For the main and event inputs, measurement of delays with respect to coil currents or other references.
. The Open or Closed state of main and event inputs is displayed by a light: thanks to these lights, the
status of the circuit breaker is continuously monitored..
. One analog circuit input circuit, with a voltage source for potentiometer transducers polarization.
Measurement is translated into stroke, speed, acceleration. In alternative, the input can measure the
auxiliary DC voltage during circuit breaker operation.
. Static resistance measurement; test current 200 A, 80 A or 25A.
. Dynamic contact resistance test; test current 200 A.
. Many triggers can start the recording.
. In case of more than two chambers per phase, capability of generating or sensing a trigger, so that a
number of units can operate at the meantime.
. All possible test sequences are programmable, including test cycling.
. Test result is shown on the display: it is possible to analyse, zoom and so on.
. Capability of storing and recalling both test settings and test results.
. The software CBA1000.PRO (that operates with WINDOWS 2000 up) is included: it allows
analyzing test results, adding notes, saving and so on. It allows also to store and recall test set settings.
. The external option DET1000 allows to perform the test while the circuit breaker has both ends
connected to earth, thus maximizing the test safety; it allows also to test circuit breakers with a graphite
nozzle.