Maybe it's the level of protection!
My current company specializes in pumping stations and I have some understanding of motor protection levels. Let me see if this can be helpful to you.
There are generally two levels of motors, one is protection level and the other is insulation level.
The insulation grade of a motor refers to the degree of heat resistance of the insulating material used, which is divided into grades A, E, B, F and H. The allowable temperature rise is reference to the limit of the increase in engine temperature relative to ambient temperature.
Insulation temperature class Class A, Class E, Class B, Class F, Class H
Maximum allowable temperature (℃) 105 120 130 155 180
< p> Winding limit temperature rise Value (K) 60 75 80 100 125Performance reference temperature (℃) 80 95 100 120 145
In electrical equipmentWhen it comes to generators, insulation materials are the weakest link. Insulating materials are particularly sensitive to the effects of high temperatures, which can cause accelerated aging and damage. Different insulating materials have different heat resistance properties, and electrical equipment using different insulating materials have different abilities to withstand high temperatures. This is why general electrical equipment imposes a maximum temperature for its operation.
People have stipulated 7 maximum allowable temperatures for different insulating materials based on their ability to withstand high temperatures. They are arranged according to temperature: Y, A, E, B, F, H and C. Their permissible working temperatures are: 90, 105, 120, 130, 155, 180 and above 180°C. Therefore, class B insulation indicates that the temperatureheat resistance of the insulation used in the generator is 130°C. When the generator is operating, the user must ensure that the generator's insulation material does not exceed this temperature to ensure normal generator operation.
Insulating materials with a class B insulation level are mainly made up of mica, asbestos and glass fibers bonded or impregnated with organic glue.
IP protection level and test method description (according to EN60529/IEC529) Protection level IP54, IP is the marking letter, number 5 is the first marking number, 4 is the second marking number, the first marking number indicates the level of protection and protection against foreign bodies, the second marked number indicates the level of protection against water; Level of protection against contact and protection against foreign bodies (first digit) Level of protection againstwater (second digit)
First protection number Second range number
Protection range
Name DescriptionName Description
0 No protection - 0
No protection -
1 Protection against detectors of solid foreign bodies with a diameter of 50 mm and above, the diameter of the sphere is 50 mm and must not enter completely 1 Protection against falling water Water droplets falling vertically must not cause damage
2 Protection against 12.5 mm diameter and solid foreign body detector larger, the SphereThe diameter is 12.5 mm and should not be completely penetrated. 2 When the cabinet is tilted at an angle of 15 degrees, protection against dripping water.
When the cabinet is tilted at an angle of 15 degrees to one side or the other . , water drops falling vertically must not cause damage.
3 Protection against foreign body detectorss solids with a diameter of 2.5 mm and more. The diameter of the sphere is 2.5 mm and should not penetrate completely. Water splashed on both sides of the vertical line at an angle of 60 degrees should not cause damage.
4 Protection against solid foreign body detectors with a diameter of 1.0 mm and more. The diameter of the sphere is 1.0 mm and should. 4 Protection against jets of water directed at the cabinet from all directions should not cause damage.
5 Dust protection cannot completely prevent dust from entering, but the amount of dust entering will not cause. damage to equipment. 5 Protective jets of water directed at the cabinet in all directions must not cause damage. 6 Dust should not enter the dust-sealed cabinet at a low pressure of 20 millibars. 6 Protection against strong water. The powerful jets of water directed towards the cabinet fromany direction should not cause damage.
Note: The diameter of the detector should not pass through the cabinet hole. 7 Protection against short-term immersion in water when the cabinet is immersed in water for a short time under standard pressure, no amount of water that could cause damage should be immersed
8 Protection against long-term immersion in water Can be immersed in water under specific conditions, and there should be no immersion in water that could cause damage.
Technical Compendium - Leak Test
1 Scope: The leak test includes the second characteristic number from 1 to 8, i.e. the. Protection level codes are IPX1 to IPX8.
2. Different levels of leak test content
(1) IPX1
Method name: vertical drip test
Test equipment: for e drip test devicet its testing methods, see 2.11
Sample placement: Place the sample in its normal working position on a rotating sample table at 1 rpm, with the top of the sample to
The distance between drip ports is not more than 200mm
Test conditions: drip volume is 1 0.5mm/min
Test time: 10 min
(2) IPX2
Method name: 15° inclined drip test
Test equipment: drip test device and its test method, see 2.11
Sample placement: Make the sample. One surface forms an angle of 15° with the vertical line, and the distance from the top of the sample to the drip hole is less than 200 mm. After each test on one side, switch to the other. ． ． ． ． Faces, four times in total.
Test conditions: dripping volume is 3 0.5 mm/min
Test time: 4 × 2.5 min (total 10 min
(3);X3
Method name: Water spray test
Test method: a.Tubular water spray test
Test equipment: swing tube water spray test device (see 2.14 of this book for device diagram and test methods)
Sample placement: select the appropriate spray radius on swivel tube, so that the height of the sample table is the diameter of the swivel tube.
Place the sample on the sample table so that the distance between the top and the water sample nozzle is not large.
At 200 mm, the sample stage does not rotate.
Test conditions: The water flow is calculated according to the number of spray holes of the swing pipe, and each hole is 0.07L/min. When spraying water, the water spray holes in the 60° arc segments on both sides of the midpoint of the swing tube aresprayed towards the sample. The sample to be tested is placed in the center of the semicircle of the pendulum tube. The pivot tube rotates 60° on both sides of the vertical line, for a total of 120°.
Each swing (2×120°) takes approximately 4 seconds.
Test duration: Spray water continuously for 10 minutes.
Test method: b. Sprinkler type water test
Test equipment: hand-held water splash test device, please see item 2.14 of this book for device graphics and test methods < /p>
Sample placement: Make the parallel distance between the top of the test and the water nozzle of the handheld nozzle is between 300mm and 500mm
Conditions test: A baffle with a counterweight should be installed during the test, and the water flow is 10 L/min
Test duration: calculated according to the hull area of the sample tested, 1 min per square meter (excluding surfaceinstallation
zone), at least 5 min.
(4) IPX4
Method name: water splash test;
Test method: a. Oscillating Tube Water Splash Test
Test equipment and sample placement: are the same as paragraph (3) IPX3 above, paragraph a;
Test Conditions: Except for the following conditions, are the same as those in paragraph (3) IPX3 above, paragraph a; The spray surface area
is the spray of water from the spray holes in the 90° arc segments on both sides of the midpoint of the oscillating tube to the sample. The sample to be tested is placed in the center of the semicircle of the pendulum tube. The swing tube rotates 180° on both sides of the vertical axis, for a total of approximately 360°.
Each swing (2×360°) takes approximately 12 seconds.
Test duration: same as paragraph (3) IPX3 paragraph a above (i.e.i.e. 10 minutes).
Test method: b. Nozzle splash test
Test equipment and sample placement: the baffle with a counterweight installed on the equipment should be removed and the rest should be the same as above
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Article (3) IPX3, paragraph b is the same
Test conditions: except for the following conditions, they are the same as the paragraph below above (; 3) IPX3, paragraph b;
Duration of the test: same as paragraph b of IPX3 in article (3) above, i.e. depending on the hull surface of the tested sample< /p>
Calculation per surface, 1 minute per square meter (excluding installation surface) and at least 5 minutes.
(5) IPX5
Method name: Water spray test
Test equipment: The inner diameter of the spray port d nozzle water is 6.3mm; test diagram and method See 2.14 of this book
Test conditions: make suree that the distance between the test sample and the water spray outlet is 2.5-3m and the water flow is 12.5L/min (750L/h). ;
Test duration: calculated based on the shell surface of the tested sample, 1 minute per square meter (excluding installation area)
At least 3 minutes.
(6) IPX6
Method name: Strong water spray test;
Testing equipment: The inner diameter of the water outlet of the nozzle is 12.5mm; Charts of the device and its For the test method, see chapter 2.14 of this book
Test conditions: make the distance between the test sample and the water spray outlet is 2.5-3m, and the water flow is 100L/min
(6000L/h);
Test time: calculated based on the shell area of the tested sample, 1 minute per square meter (excluding installation area) and at least 3 minutes.
(7) IPX7
Namee method: short-term immersion test
Test equipment and test conditions: immersion box. The size should be such that once the sample is placed in the immersion box, the distance between the bottom of the sample and the water surface is at least 1 m. The distance between the top of the sample and the water surface must be at least 0.15 m.
Test duration: 30 minutes.
(8) IPX8
Method name: continuous diving test;
Test equipment, test conditions and test duration: agreed by both supply and demand (buyer and seller). The severity level should be above IPX7.