Acceptance Tests

Q.

(Lot 2 - FDU)
Acceptance Tests, ref. § 7.2.4 and § 7.3.4;
if NonLinear Dump Resistors are adopted:
a) Measurement of the nominal resistance:
with NonLinear resistors the resistance at 20 °C has no relationship with the voltage across the DR.
If the Dump Resistors are made of N elements in parallel, we assume that the test should verify that with a current of 42,5 kA / N, the voltage across the element should be not greater than 5,2 kV. Is this correct?
b) Test to verify the rated energy:
we assume that when the nominal energy is adiabatically dissipated into an element of them, the tests are satisfied if no mechanical deformation occurs on the tested element. Is this correct?
c) Test to verify the electro‐dynamic resistance of the DR:
we assume that if one DR is made up of N elements in parallel, this test can be carried out on one of these elements at a current of 53 kA / N; this also to agree on a test that is feasible with the available testing setup. Is this correct?

A. 

(Lotto 2)
a) It is correct.
b) No. In this case the test shall be performed on one module (composed by N. elements in parallel) because I need to verify the current sharing and temperature distribution among elements i.e. by a thermocamera.
c) No. In this case the test shall be performed on one module (composed by N. elements in parallel) because current sharing in a given branch can be much different and cause a damage. If you are not able to perform this test internally you need an external facility/laboratory where you can perform the test (this in phase of offer must be declared).

 

 

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