GB/T 24344-2009Electrical equipment of industrial machines - High-voltage test specifications (English PDF)

3.1 circuit of the entire electrical equipment, as well as the connection between the circuit

under test and the protective grounding circuit. Clean up the test site. Make warning signs, within the safety range of the electrical equipment to be tested.

6.1 General requirements

Only electrical equipment, that has been subjected to the relevant requirements in GB 5226.1-2008 or the insulation resistance test of GB/T 24243-2009, is allowed to be subject to the withstand voltage test.

The scope of the withstand voltage test shall include the power input terminals and output terminals of the power switch of the entire electrical equipment, as well as all power circuit wires. If there is a dedicated power inlet terminal group, it shall also be subject to the withstand voltage test, at the same time as the power switch and all power circuit wires.

The control circuit in the electrical equipment, as well as the circuit wires and components that need to be subjected to the withstand voltage test, shall be subjected to the withstand voltage test, at the same time as the power circuit.

Circuits in electrical equipment below PELV AND circuits unsuitable to withstand the test shall be disconnected, during the test.

6.2 Test range

a) Power circuit wires and related components, including power input terminals, output terminals and actuators of power switches (such as motors, electromagnets, electromagnetic clutches, etc.);

b) Control circuits higher than PELV, in electrical equipment, AND circuit wires and components, that need to be subjected to withstand voltage test;

c) Except for circuits intended to operate at a voltage, which is lower than or equal to PELV;

d) Circuits, which are unsuitable to withstand the test, shall be disconnected during the test;

e) Components that have been subjected to the withstand voltage test, according to the product standard, can be disconnected during the test.

During the withstand voltage test, a) and b) shall be tested simultaneously.

7.1 Withstand voltage test

When the withstand voltage test is performed on the electrical equipment under test, it shall use the test equipment, which complies with the provisions of GB/T 16927.2-1997.

The test method of withstand voltage test shall be as specified in Chapter 5.

7.2 Test requirements

For the conductor of the withstand voltage test circuit, in the electrical equipment under test, the grounding output terminal of the testing equipment shall be connected to the PE or protective grounding wire of the electrical equipment under test; the high voltage output terminal of the testing equipment shall be reliably connected with the tested conductors of the electrical equipment test.

Flashover and dielectric puncture are not allowed in the withstand voltage test. Otherwise, the test is regarded as failed.

For large-scale equipment under test AND equipment under test requiring segmented tests, segmented tests are allowed. During the test, each segment shall not produce flashover and dielectric puncture.

After the withstand voltage test, the circuit of the electrical equipment under test shall be restored, AND the electrical equipment under test shall be able to work normally.

A.1 Brief description

This Appendix gives the circuit diagram of a certain electrical equipment of industrial machinery (Figure A.1 ~ Figure A.6), as the circuit diagram of the withstand voltage test of the electrical equipment of industrial machinery. Figure A.1 and Figure A.2 is the main circuit and control circuit power supply.

This Appendix only serves as an example for individual parts, which contain PELV. Figure A.3 ~ Figure A.6 is the control circuit.

A.2 Withstand voltage test procedure

a) Cut off the power supply line of the electrical equipment under test.

b) Close the power switch.

c) Connect F1, F2, F6, F7, F14, F11, F12, F13.

d) Short-circuit the terminals U11 and 1 on T1.

e) Short-circuit the terminals U11 and 29 on T2.

f) Short-circuit the terminals U01 and U02 on T3.

g) Short-circuit the contacts 39 and 40, 05 and 41 on K3.

h) Short-circuit the U and U21 on the main contact of K1.

i) Short-circuit the U and U23 on the main contact of K2.

j) Clean up the work site.

k) Add a safety isolation fence or a safety cordon, at the safe distance of the electrical equipment under test.

l) Check the safety protection measures of the operator.

m) Apply withstand voltage test voltage, between U and the protective earth circuit.

n) Record test data. […]