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频道帖子
ANSI/ISEA Z89.1-2009: American National Standard for Industrial Head Protection
https://www.facebook.com/share/p/TFaoxkTjcGXQDfkD/?mibextid=oFDknk
| 2 | Transformer Health Assessment according to
IEC 60422
The full lesson is on the YouTube channel
https://youtu.be/t5bSMyJsb1o?si=GWIm5vr4nlrBlPZM | 4 843 |
| 3 | Lock out relay testing (86)
https://www.facebook.com/share/p/FBHSyyzg7Aw2SvH7/?mibextid=oFDknk | 2 352 |
| 4 | Tripping Classifications and its Significance in Generator Protection:
https://www.facebook.com/share/p/U2JarKPdddFou8nY/?mibextid=oFDknk | 4 558 |
| 5 | Generator protection
https://www.facebook.com/share/p/C6FfDqtvAGGriVav/?mibextid=Nif5oz | 4 256 |
| 6 | Line protection
3. Distance protection
https://www.facebook.com/share/p/YHMPamcNwP444Rib/?mibextid=oFDknk | 4 117 |
| 7 |  +9没有文字... | 3 381 |
| 8 | Are you wearing the right gloves?
Everyone working with electricity should be wearing insulating
gloves to protect them from the danger of electrical shocks
and burns – it can be a matter of life or death. Even minor
electrical shocks can be fatal if someone has an unknown heart
condition.
No matter where or what the industry or environment, electricalinsulation gloves (also known as electrician gloves, insulatingrubber gloves, electricity gloves and linesman gloves) areessential wear to keep people safe at work.
But, do you have the right gloves for your work?
Choosing the right glove
Insulating electrician gloves used in Europe mustcomply with EN 60903 standard Electrical
Insulating Gloves. EN 60903-compliant gloves
are defined by six classifications, relating to thevoltage they are capable of providing electrical
shock protection against. These are as follows:
Class 00 – 500 volts AC
750 volts DC
Class 0 – 1,000 volts AC
1,500 volts DC
Class 1 – 7,500 volts AC
11,250 volts DC
Class 2 - 17,000 volts AC
25,500 volts DC
Class 3 - 26,500 volts AC
39,750 volts DC
Class 4 – 36,000 volts AC
54,000 volts DC
Choosing the right glove
The ASTM label system uses colour to define immediately and visuallythe voltage protection level for each classification and carriesinformation including the manufacturer/brand, country of origin andmaximum voltage protection.
Class 00 – Beige
Class 0 – Yellow
Class 1 – Red
Class 2 - White
Class 3 - Green
Class 4 – Orange
IEC60903 application:
Classification
The gloves covered by this standard shall be designated as follows:
– by class, as class 00, class 0, class 1, class 2, class 3 and class 4;
– by special properties, by the addition of a suffix to the class of the glove as shown in Table 1.
Guidance as to temperature range at which gloves can be used is given in Annex A.
(Temperature Standard gloves should be used in areas having ambient temperatures between –25 °C and +55 °C, and category C gloves should be used in ambient temperatures between –40 °C and +55 °C.)
When a colour code for symbols is used, it shall correspond to the following:
class 00 – beige;
class 0 – red;
class 1 – white;
class 2 – yellow;
class 3 – green;
class 4 – orange.
Electrical requirements:
Gloves shall be capable of withstanding the corresponding electrical stresses according to its electrical class.
Marking:
Each glove which is claimed to comply with the requirements of this standard shall bear a
label and/or marking giving the following information:
– symbol IEC 60417-5216:2002-10 – Suitable for live working; double triangle (see Annex B);
NOTE The exact ratio of the height of the figure to the base of the triangle is 1,43. For the purpose of convenience, this ratio can be between the values of 1,4 and 1,5.
– number of the relevant IEC standard immediately adjacent to the symbol (IEC 60903);
– name, trademark or
identification of the
manufacturer;
– category, if applicable;
– size;
– class;
– month and year of manufacture.
Composite gloves shall also be identified with a mechanical symbol (hammer), adjacent to the double triangle (see Figure 3). The length of the hammer (x) shall be equal to the length of
one side of the triangles. | 2 398 |
| 9 | J_Lewis_Blackburn_Symmetrical_Components_for_Power_Systems_Engineering.pdf | 2 857 |
| 10 | J_Lewis_Blackburn_Symmetrical_Components_for_Power_Systems_Engineering.pdf | 1 |
| 11 | Line protection
2.diffirential protection
https://www.facebook.com/share/p/kdCfbUetTi13qSom/?mibextid=oFDknk | 4 388 |
| 12 | Line protection
https://www.facebook.com/share/p/3s811Nf3tXBHYWGk/?mibextid=oFDknk | 4 752 |
| 13 |  没有文字... | 2 602 |
| 14 | Contactors utilisation categories
https://www.facebook.com/share/p/U4xfvEStjf1beu9J/?mibextid=oFDknk | 3 153 |
| 15 | https://t.me/hamster_kombat_bOt/start?startapp=kentId1190410446
Jouez avec moi, devenez PDG d'un échange crypto et obtenez un airdrop de jetons!
💸 2k pièces en cadeau de bienvenue
🔥 25k pièces si vous avez Telegram Premium | 3 053 |
| 16 | Feeder differential protection , 87F
Micom P543 areva, inputs and outputs control.
https://www.facebook.com/share/v/tqKLVRySn1qFMEem/?mibextid=oFDknk | 4 546 |
| 17 | Records view , Micom P143
https://www.facebook.com/share/r/JZX5ixF86SaJkLSX/?mibextid=oFDknk | 3 939 |
| 18 |  没有文字... | 1 |
| 19 |  +9没有文字... | 3 033 |
| 20 | 24 T-code
Motors for use in hazardous environments are assigned a temperature code (T-code) which describes the maximum temperature of surfaces subject to contact with hazardous materials. The temperature
value defined by the T-code applies under all conditions of motor operation including burnt out, overload and locked rotor current. The T-code for a given motor must be less than the autoignition temperature (AIT) of the hazardous gas or mixture in the environment where the motor operates. This is to ensure that the hazardous materials do not spontaneously ignite when it contacts the motor surfaces and enclosure during operation
25 Safety and efficiency certification marksThese marks including agency markings, memberships and testing certifications
26 Catalog number (CAT. NO.)
The catalog number corresponds to the motor’s number in the Baldor-Reliance 501 catalog. If blank, the motor is custom. This field may also include a unique OEM part number or modification number.
27 Spec number (SPEC.)
The spec number is used to identify the motor’s specific bill of materials which is useful in locating motor parts.
28 Magnetizing current (MAG. CUR.)
If a motor is intended to be used with a variable speed drive with vector control, the drive needs this additional information about the motor circuit in order to auto-tune the in-stationary mode. The drive calculates the magnetizing current and the torque-producing current as vectors, keeping the two
vectors separated by 90° for maximum efficiency and torque.
29 Inverter type (INV TYPE)
This data indicates the inverter type and input frequency range(s) for which the motor is rated. In this case, the motor is rated for a Pulse Width
Modulation (PWM) drive, with the motor rated for a constant
horsepower (CHP) range of 60 to 90 Hz, a constant torque (CT) range of 1 to 60 Hz, and a variable torque (VT) range from 0 to 60 Hz input.
NOT SHOWN
Locked rotor code (CODE)
NEMA defines locked rotor [kilovolt-ampere (kVA) per horsepower (Hp)] with a series of code letters (A to V). Generally, the farther the code letter is from A, the higher the inrush current per Hp. A replacement motor with a higher code letter may require different upstream electrical equipment,
such as a larger motor starter. When AC motors are started with full voltage (across-the-line starting), they draw line amperage 300 percent to 600 percent greater than their full load running current. The
magnitude of the inrush current (also called locked rotor amps or LRA) is determined by motor
horsepower and design characteristics. | 1 818 |
