How is the rated current of the low voltage distribution cabinet calculated?

It's to seeDisconnectorThe current of the incoming cabinet is calculated according to the transformer, and the capacity = 3 * voltage * current.

The rated current of the 315 transformer.

About 455A, the disconnector 600 (630) is a specification, and 400 has a specification, so only 630 or 600 disconnectors can be used, and the rated current of the general cabinet is written in the size of the disconnector.

Generally, the transformer will not run at full load, so the inlet cabinet uses a 300 ammeter.

It is also possible that the ammeter of the capacitor cabinet is calculated according to the number and capacity of the capacitor, and the metering cabinet is similar to that of the incoming cabinet.

Main architecture. The basic structure of the cabinet is a combined assembly structure. Bolt fastening connection, 20mm is the module of the installation hole device of the functional chamber isolated from each other, the basic feature of the GCK cabinet is that the bus bar is in the upper part of the cabinet, and the compartment is divided into functional unit room (in front of the cabinet), bus room, cable room (behind the cabinet).

It is also reliable for wall installation, at this time, the right side of the cabinet is widened by 200mm as a cable room, which is similar to the top bus style of the MNS cabinet.

The above content reference: Encyclopedia - low-voltage distribution cabinet.

It's to look at the isolation switch, the isolation switch should be about 630A, right? The current of the incoming cabinet is calculated according to the transformer, capacity = root 3 * voltage * current, the rated current of the 315 transformer is about 455A, the disconnector 600 (630) is a specification, 400 has a specification, so only 630 or 600 isolation switches can be used, the rated current of the general cabinet is written in the size of the disconnector switches, and the general transformer will not run at full load, so the incoming cabinet can also use a 300 ammeter, The ammeter of the capacitor cabinet is calculated according to the number and capacity of the capacitor, and the metering cabinet is similar to that of the incoming cabinet.

In fact, the rated current of a group of cabinets, that is, the current of the main bus, is given by the manufacturer, which can be calculated by the load rated power. But in practice, the main switch is used directly, although the rated current does not depend on any one component! In addition, the content of the manufacturer's label may be related to the scope of its product certification!

In addition, don't mislead people, what low voltage 1kw two currents, the 455 calculated below is correct.

It is derived from the rated capacity of the configured power transformer, which has a capacity of 315 kW according to this data.

This is the basic specification parameter of the distribution cabinet.

The rated voltage, 380V refers to the voltage level used in the distribution cabinet.

The rated current of 2000A means that the current that the distribution cabinet is allowed to disconnect or pass through is 2000 amperes. However, under normal conditions, this current needs to be derated.

According to the national industry standard for AC low-voltage distribution cabinets for new energy-saving products, the voltage of the outgoing voltage of low-voltage distribution cabinets is 380V for three-phase and 220V for single-phase.

The rated current of the low-voltage distribution cabinet is AC 50Hz, the rated voltage of 380V power distribution system, the main role is to distribute power, the voltage through the transformer to each power unit, for the low-voltage distribution system power, lighting power distribution.

Hello:——1,For power transformers in China, the secondary rated output voltage is the standard KV (400 V), which will be clearly marked on the nameplate of the transformer.

Low-voltage distribution cabinetThe distance from the transformer is very close, the normal value of the outlet voltage of the distribution cabinet should be kv (400 V), if it is lower than kv, the tap of the transformer should be adjusted.

It should be more electricity than the home location!

The setting value of the low-voltage distribution cabinet refers to the set value of the rated current and the rated short-circuit current of the electrical protection equipment, which can usually be viewed through the identification or nameplate of the equipment itself. Specifically, you can follow the steps below to check the setting value of the low-voltage distribution cabinet:

Check the nameplate or logo of the low-voltage distribution cabinet, usually marked with the rated electro-hydraulic reflux, rated short-circuit current and rated voltage of the distribution cabinet.

Find the model and specifications of appliance protection equipment, such as fuses, circuit breakers, contactors, and more.

Consult the manual or related information of the electrical protection equipment to understand the set values of its rated current and rated short-circuit current.

According to the actual needs, the setting value of the electrical protection equipment is set and adjusted to ensure the safe and stable operation of the low-voltage distribution cabinet.

It should be noted that the setting value of the low-voltage distribution cabinet is determined according to the specific electric index gas equipment and load situation, so it is necessary to take into account the actual situation when setting the setting value to avoid too low or too high to ensure the normal operation and safe use of electrical equipment.

Summary. It is used to transmit electric energy, and the calculation formula of electric power is w = where: w - electric power, unit kwu - voltage, unit kvi - current, unit acos - the natural power factor of the system can be seen from the above formula, to transmit electric energy, there must be current flowing through the line, the larger the current through the line, the more electric power is transmitted.

The current carrying capacity refers to the amount of current transmitted by the line wire. The maximum allowable current carrying capacity of each type of wire is specified in the national specification. In operation, the maximum load current required by the load must be less than the long-term allowable current carrying capacity of the wire in the air.

For example, if a 25 square millimeter copper core wire has a long-term allowable current carrying capacity of 105A in the air, when your main equipment is running, the operating current can only be less than or equal to 105A, and never greater than 105A. Estimating mantra:

Multiply by nine at 2.5 and subtract one by one straight up. Thirty-five times 3.5, double in a group minus five. The conditions have been changed and converted, and the high-temperature nine-fold copper has been upgraded.

The number of pipe roots is two, three, four, eight, seven and six folds full of load current. Extended information: For example, the calculation of the current carrying capacity of the aluminum core insulated wire when the ambient temperature is not more than 25:

When the cross-section is 6 square millimeters, the calculated current carrying capacity is 30 amperes; When the cross-section is 150 square millimeters, the calculated current carrying capacity is 300 amperes; When the cross-section is 70 square millimeters.

Excuse me, but please go into more detail?

It is used to transmit electric energy, and the calculation formula of electric power is w = where: w - electric power, unit kwu - voltage, single foot jujube high level kvi - current, unit acos - the natural power factor of the system can be seen from the above formula, to transmit electric energy, there must be current flowing through the line, the greater the current through the line, the more electric power is transmitted. The ampacity of the mausoleum refers to the amount of current transmitted by the line wire.

The maximum allowable current carrying capacity of each type of wire is specified in the national specification. In operation, the maximum load current required by the load must be less than the long-term allowable current carrying capacity of the wire in the air. For example:

The long-term allowable current carrying capacity of 25 square millimeters copper core wire in the air rock brigade is 105A, and when your main equipment is running, the operating current can only be less than or equal to 105A, and can never be greater than 105A. Estimation formula: 2.5 times 9, subtract one straight up and go.

Thirty-five times 3.5, double in a group minus five. The conditions have been changed and converted, and the high-temperature nine-fold copper has been upgraded. The number of pipe roots is two, three, four, eight, seven and six folds full of load current.

Extended information: For example, the calculation of the current carrying capacity of the aluminum core insulated wire when the ambient temperature is not more than 25: when the cross-section is 6 square millimeters, the calculated current carrying capacity is 30 amperes; When the cross-section is 150 square millimeters, the calculated current carrying capacity is 300 amperes; When the cross-section is 70 square millimeters.

Summary. In a low-voltage distribution cabinet, the current carrying capacity of a wire depends on the size and material of the wire. For example, according to the national wire and cable standard, a copper wire with a current-carrying capacity of 35A is approximately 6 mm in diameter.

This means that when the current of this wire reaches 35A, it can only work properly while maintaining a safe operating temperature. If the current exceeds this limit, the wire may become hot or even catch fire. Therefore, when designing a low-voltage power distribution system, it is essential to choose the correct size of the wires to ensure that they can withstand the expected current loads.

Typically, this takes into account the total power of the electrical load and the rated current of the electrical equipment and is calculated according to the relevant electrical codes and standards. Hope this helps. If you have other questions, please feel free to let me know.

In a low-voltage distribution cabinet, the current carrying capacity of a wire depends on the size and material of the wire. For example, according to the national wire and cable standard, a copper wire with a current-carrying capacity of 35A is approximately 6 mm in diameter. This means that when the current of the wire reaches 35A, it can only work normally while maintaining a safe operating temperature.

If the current exceeds this limit, the wire may become hot and lead to a fire. Therefore, when designing a low-voltage power distribution system, it is essential to choose the correct size of the wires to ensure that they can withstand the expected current loads. Typically, this takes into account the total power of the electrical load and the rated current of the electrical equipment and is calculated according to the relevant electrical codes and standards.

Excuse me, but please go into more detail?

In a low-voltage distribution cabinet, the current carrying capacity of a wire depends on the size and material of the wire. For example, according to the national wire and cable standard, a copper wire with a current-carrying capacity of 35A is approximately 6 mm in diameter. This means that when the current of the wire reaches 35A, it can only work normally while maintaining a safe operating temperature.

If the current exceeds this limit, the wire may become hot and lead to a fire. Therefore, when designing a low-voltage power distribution system, it is essential to choose the correct size of the wires to ensure that they can withstand the expected current loads. Typically, this takes into account the total power of the electrical load and the rated current of the electrical equipment and is calculated according to the relevant electrical codes and standards.

Summary. A: The rated current level is generally 1600A, 2000A, 2500A, 3150A, 4000A. Others are rare. The rated voltage is 6kv, 10kv (12kv), 35kv (

A: The rated current level is generally 1600A, 2000A, 2500A, 3150A, 4000A. Its finches collapse its rarity. The rated voltage is 6kv, 10kv (12kv), 35kv (

Can you add, I don't quite understand it.

The pro is the low-voltage distribution room, the switch cabinet, each phase of the cover of the current voltage between 220-280. Limb Rock 1The power distribution room is also called the power distribution office, and in the national suffocation standard, the definition of the power distribution station is:

There are only high-voltage distribution devices that play the role of opening and closing and distributing electric energy, and there is no main transformer on the bus." 2.The difference between a distribution station and a substation is that the distribution room (distribution station) does not have a transformer, whereas the substation has all transformers.

The power distribution room is the key part of the power supply system of the building, and a full-time electrician is on duty for it 24 hours a day. Non-staff members are not allowed to enter without the permission of the manager of the management office and the head of department. 3.

The attendant must be certified to work and be familiar with the status of power distribution equipment, operation methods and safety precautions. The attendant must pay close attention to the indications of voltmeter, ammeter and power factor meter; It is strictly forbidden to overload the air switch. 4.

Always keep the floor of the distribution room and the appearance of the equipment dust-free. The operation of the reverse switch of the distribution room equipment shall be carried out by the attendant alone, and the other personnel present shall only supervise and shall not interfere; It is strictly forbidden for two people to reverse the gate at the same time to avoid mistakes.

According to the national industry standard for AC low-voltage distribution Qinwang cabinet of new energy-saving products, the voltage of the outlet of low-voltage distribution cabinet is: three-phase is 380 volts; Single-phase is 220 volts.

The main technical performance of the low-voltage distribution cabinet:

Rated working voltage: 380 volts, 660 volts; Frequency of use: 50 Hz; Type Shoushan Rated Current:

1600 to 3150 amps for horizontal bus systems, 400 to 800 amps for vertical bus systems; Rated short-time withstand current: horizontal bus 80 kA, effective value every 1 second, vertical bus 50 kA, effective value every 1 second; Rated peak current: horizontal bus 175 kA, vertical bus 110 kA; Functional unit breaking capacity:

50 kA; Peripherals protection level: IP40.