AS 60034.5:2009 pdf free download – Rotating electrical machines Part 5: Degrees of protection providedby the integral design of rotating electrical machines (IP Code)—Classification

AS 60034.5:2009 pdf free download – Rotating electrical machines Part 5: Degrees of protection providedby the integral design of rotating electrical machines (IP Code)—Classification.
Unless otherwise specified, the machine for each test shall be clean with all the parts in place and mounted in the manner stated by the manufacturer.
In the case of both first and second characteristic numerals 1, 2. 3 and 4, a visual inspection may, in certain obvious cases, show that the intended degree of protection is obtained. In such cases, no test need be made. However, in case of doubt, tests shall be made as prescribed in clauses 8 and 9.
7.1 Adequate clearance
For the purpose of the following test clauses in this standard, the term adequate clearance’
has the meaning given in 7.1.1 or 7.1,2.
7.1.1 Low-voltage machines (rated voltages not exceeding 1 000 V a.c. and 1 500 V d.c.)
The test device (sphere, finger. wire, etc.) does not touch the live parts or moving parts other than non-dangerous parts such as smooth rotating shafts.
7.1.2 High-voltage machines (rated voltages exceeding 1 000 V a.c. and 1 500 V d.c.)
When the test device is placed in the most unfavourable position, the machine shall be capable of withstanding the dielectric test applicable to the machine.
This dielectric test requirement may be replaced by a specified clearance dimension in air which would ensure that this test would be satisfactory under the most unfavourable electrical field configuration.
8 Tests for first characteristic numeral
Test and acceptance conditions for the first characteristic numeral are given in table 4
The dust test for numerals 5 and 6 shall be performed with the shaft stationary, provided that the difference in pressure between running and stationary (caused by fan effects) is lower than 2 kPa. If the pressure difference is greater than 2 kPa, the internal machine pressure during the dust test shall be depressed accordingly. Alternatively, the machine may be tested with the shaft rotating at rated speed.
9.2.1 The amount of water which has entered the machine shall not be capable of interfering with its satisfactory operation. The windings and live parts not designed to operate when wet shall not be wet and no accumulation of water which could reach them shall occur inside the machine.
It is, however, permissible for the blades of fans inside rotating machines to be wet and leakage along the shaft is allowable if provision is made for drainage of this water
9.2.2 In the case of a test on a machine not running:
a) the machine shall be operated under no-load conditions at rated voltage for 15 mm, b) then be submitted to a withstand voltage test, the test voltage being 50 % of the test
voltage for a new machine (but not less than 125 % of the rated voltage).
In the case of a test on a running machine, only the withstand voltage test is made, in accordance with item b) above,
The test is deemed satisfactory if these checks show no failure.
10 Requirements and tests for open weather-protected machines
The degree of protection W is intended for air-cooled open machines with open circuit cooling. that is, machines with cooling systems designated by ICOX to IC3X according to IEC 60034-6.
Weather-protected machines shall be so designed that the ingress of rain, snow and airborne particles into the electrical parts is reduced
Other measures providing weather protection (such as encapsulated windings or total enclosure) are not designated by W.
Machines with degree of protection W shall have ventilation passages constructed such that:
a) at both intake and discharge, high-velocity air and airborne particles are prevented from entering the internal passages leading directly to the electrical parts of the machine;
b) the air intake path. by baffling or use of separate housings, provides at least three abrupt changes in the direction of the air intake, each of which is at least 90°;
c) the air intake path provides an area of average velocity not exceeding 3 m/s, enabling any particles to settle. Removable or otherwise easy to clean filters or any other arrangement for the separation of particles may be provided instead of a settling chamber.