Automatic verification of IEK VA series 47-29 on breaking capacity

Recently, I heard a lot of criticism about the low quality of the company machines IEK: "The fact that they are not disabled and their face value does not match the declared parameters." Really so bad? In this article I will make a check mark automatically switch IEK series VA 47-29 with the time characteristic and the nominal current C 10.

Checking machine

As a test sample taken from a single-pole automatic time-current characteristic of the species "FROM"And a nominal current of 10 amps.

This machine has two kinds of protection:

1. Electromagnetic release - performs instantaneous tripping machine with minimal time delay.

2. Heat element - responsible for disabling the machine with a certain time delay.

In order to see the very time-current characteristics, refer to the nameplate data for a particular circuit breaker.

Specifically, for the current model presented dependence and off time is as follows:

This graph shows the full gear for rated current and response time to our circuit breaker you. In accordance with these data we can see that the electromagnetic release begins its work in the range of 5 to 10 times the rated current, that is, if Our machine designed for 10 A, then the trip unit will begin to turn off our automatic delayed 0.01 - 0.02 seconds at a current value of 50 - 100 amperes respectively.

Heat the element (boxcar) will work on the two curves. The so-called hot and cold.

What will check

As a verification of the complex will be used RETOM device - 21. This checking device makes it easy to check as a thermal element and the solenoid trip unit.

inspection

The first step is an electromagnetic trip unit check at different currents, but within a multiplicity of 5 to 10 values ​​of the rated current.

Reported data are collected in the table shown below

As we can see from the above data, the electromagnetic release is operating within the passport data.

Now we go to check it thermal element.

The test results are summarized in the table presented below

Visual demonstration of complex verification and off the test machine shown in the video.

Output

As can be seen from the tests produced automatically switch firms IEK AB 47 - 29, C - 10 It is consistent with the stated nameplate data and with its protective function copes.

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