The DTE-20M purpose
The DTE-20M device is intended for operability testing and ampere-second characteristics monitoring of circuit breakers by power frequency AC in the range 20A – 20kA. It is capable to measure and record time and values of current transmitted through the circuit breaker, hereinafter – CB. It can be used as a controlled power source of AC up to 20kA in low impedance power circuits.
In order to ensure personnel electrical safety, the output circuits are galvanically isolated from the power supply. The voltage on the DTE-20M output terminals is less than 7V with fully opened thyristor, that is favorable for the circuit breakers contacts in time of tripping, which wear-out is significantly reduced during multiple tests.
|Power supply voltage*||380V ± 10%|
|Power supply frequency||50 Hz ± 1%|
|Maximum consumption current||140 A|
|Maximum voltage at output terminals||7 V|
|Maximum current at output terminals (rms)||20 kA|
|Maximum DTE-20M power consumption||120kW|
|** Output current measuring and recording range with measurement error less than 3%||20—20000 A|
|Measuring and recording range of output current duration with measurement error less than 1,5%||0,01—1000 sec.|
|Temperature protection threshold||96°С ± 10%|
|Weight of the device without the flexible bars||86 kg max|
|Device average service life||10 years|
* Possible DTE-20M power voltage is 220V, wherein the maximum output current – 13kA).
** Technical specifications correspond to reduced values for device operation with a single-phase voltage regulator
Device operating conditions
|Environment temperature range||0°C — 35°C.|
|Relative air humidity at +25°C||≤80%.|
|Atmospheric pressure, mm Hg||630—800|
|Flexible bus, length – 2,0 m, section – 120 mm²||6 pcs.|
|Power cord with three-phase power plug and portable socket||1 pc.|
|Current sensor 2kA, 20kA/5A||1 pc.|
|Operation Manual||1 pc.|
|Calibration certificate||1 pc.|
RNO, Inom. = 10, 20, 40, 80, 120A is included in the package by supplementary agreement.