Grain imports HS code data trends

List of contents of this article:

• 1, 10kv refer to?
• 2
  、what is the voltage unit of kv
• 3. National regulations, what is the maximum allowable working voltage of 10KV in the power system
• 4, Brief discussion on 110kV substation System design: digital electronic small system design in life
• 5, What does kv represent in the power system?
• 6、How to distinguish the capacity level of the transformer

10kv refer to?

The XXkV voltage system in China refers to the line voltage of the power supply system, so in the 0kV system, the power line voltage is 10kV. Considering the problem of line voltage drop on the power supply side and the load side, the general power supply side is 5kV, the load side is 10kV, and the power supply side is 5% higher than the load side to make up for the voltage drop of the line.

KV belongs to high voltage according to the voltage level.If the voltage level of a substation is 110KV 35KV 10KV, then 110kV is the voltage level of the substation, which is the highest voltage of the station. The 110kV electricity in the station is converted into 35kV and 10kV voltage levels through the transformer.

In the power system, the voltage level is usually divided into different levels, such as 220kV, 110kV, 35kV, 10kV, 0.4kV, etc. Among them, 10kV is a voltage level for medium-voltage power lines, which is usually used in urban and rural distribution grids to transmit electricity to industrial, commercial and residential terminals.

kv The 10kv of the high-voltage line refers to the voltage between the wires, that is, the "line voltage". Its ground voltage is 10/732=77kv, that is, the "phase voltage" is 77kv.

Is Kv voltage considered high-voltage? It must be high-voltage. According to the provisions of definition 1 in GB/T 2900.50-2008, high [electric] voltage usually refers to a voltage level higher than 1000V (not included); in certain cases, it refers to the voltage level of power transmission in the power system.

KV high-voltage electricity refers to a voltage of 10000V, and high-voltage electricity refers to the AC voltage of the distribution line with an AC voltage of more than 1000V or a DC voltage of more than 1500V. AC low voltage below 1000V or DC voltage below 1500V is low voltage. The safe voltage does not exceed 36V AC and 50VDC.

What is kv Voltage unit

1, k refers to the number "1000", V is "volt", kV (kV) is the unit of voltage, and 1,000 volts refers to the voltage of 1000V.

2. kv is kilovolts. The unit of voltage is generally kilovolts (kV), but the "k" is usually written in lowercase letters, because in the International System of Units, "k" represents kilo (kilo) and "K" represents Kelvin (Kelvin".

3. kv is the unit of voltage, pronounced as kilovolt, 1kV=1000V.Voltage, also known as potential difference or potential difference, is a physical quantity that measures the energy difference generated by the unit charge in an electrostatic field due to different potentials.

4. k refers to the number "1000", V is "volt", kV kV is the unit of voltage, A is "ampere" is the unit of current kVA kilovolt ampere is the unit of power, generally refers to the capacity of your equipment transformer kilowatt-hour kwh is an energy measurement unit, indicating that the power is One kilowatt of electrical appliances.

5. kv is a unit of voltage, which means kilovolts. 1kv=1000v. It consumes 1W of power between two points carrying 1A constant current wire, and the potential difference between the two points is 1V. Volt can also be expressed by formula: 1V= 1W /A.

National regulations, what is the allowable maximum working voltage of 10KV in the power system

kv is just a voltage level in the power system, at the power end (power plant) It must be different from the regulations on the load side. The rated voltage of the 10kv system of the power plant is 5kv, which is generally allowed to increase by 5%, which reaches more than 11kv. On the load side, the user's power supply standard is mainly considered, which is lower than the voltage of the power plant.

GB/T 12325-2008 Power quality Power supply voltage deviation 2 20kV and below three-phase power supply voltage deviation is ±7% of the nominal voltage.

See GB/T 12325-2008 "Electricity Quality Power Supply Voltage Deviation".

Brief discussion on 110kV substation system design: digital and electric small system design in life

1. Substation comprehensive automation system structure design selection layered distribution system has many The advantages of the centralised desktop system are incomparable, so the hierarchical distribution system is selected for the design.

2. In order to solve these problems, drawing on foreign experience, especially how to reduce costs and improve the use value of land, considering the construction of substations underground and property development on the ground is a new way and a new way of thinking.

3. In digital electricity, Glue refers to the method of connecting different circuit components, modules, chips, etc. together in a certain way.This method can effectively realize information transmission and collaboration between components and modules, thus building a complex circuit system.

4. Power supply problems. The requirements of analog electricity for power supply are more stringent, while digital circuits work equally in a wider range of power supply. The problem of the land. The ground quality of digital circuits is very poor and the ripples are large, while the ground requirements of analog circuits are very pure. It is best to separate the two from each other and use components such as magnetic beads or inductors.

5. Ability of circuit design: With the improvement of chip integration, hardware design seems to be simpler. The first is the logical connection, and the second is the serial resistance selection and parallel capacitance selection required for signal integrity, power filtering and decoupling.

6. The meaning of the letters in the picture. Q is a state variable. This circuit has two states, 0 and 1.The input functions are A and B. F is the output function. From the truth table, F is equal to A or B, that is, F is 1 when AB is the same, and F is 0 when AB is different. The circle on the right indicates the jump state.

What does kv represent in the power system?

KV is the unit of voltage in the power system. Voltage is a physical quantity that measures the potential difference in the power system, which is used to transmit and distribute electrical energy. The unit of voltage is usually Volt or its kilo-volt thousand-fold unit kilovolt. kV refers to 1000 volts, which is represented by the symbol kV.

The unit of voltage is volts (V), and 1000 is abbreviated as k, that is, 1kV = 1000V. In the industry, it is usually used to say k as ten thousand, for example, 220kV usually says 220,000 V.

k refers to the number "1000", V is "volt", kV (kV) is the unit of voltage, and 1,000 volts refers to the voltage of 1000V.

kVA (kVA) refers to a unit of capacity of power equipment (such as transformers, motors, etc.). In an AC circuit, voltage (kV) * current (amp) = capacity (kV). The capacity of the transformer is expressed in kVA. Kilowatt is the unit of power, which is equal to 1000 watts.

How to distinguish the capacity level of the transformer

by phase: single-phase transformer: used for single-phase load and three-phase transformer group. Three-phase transformer: used for voltage rise and fall of three-phase systems.

According to voltage grade: 1000KV, 750KV, 500KV, 330KV, 220KV, 110KV, 66KV, 35KV, 20KV, 10KV, 6KV, etc. According to the insulating heat dissipation medium, it is divided into dry transformers and oil-immersed transformers. Among them, dry transformers are divided into: SCB epoxy resin-posted dry transformers and SGB10 non-enclosed H-level insulated dry transformers.

The capacity levels of the transformer are: 30KVA, 50KVA, 63KVA, 80KVA, 100KVA, 125KVA, 160KVA, 200KVA, 250KVA, 315KVA, 400KVA, 500KVA, 630 KVA, 800KVA, 1000, 1250, 1600, 2000KVA, 2500KVA, etc.

The capacity level of the transformer is divided into: transformers of 630KVA and below are collectively called small transformers, transformers of 800~6300KVA are called medium transformers, transformers of 8000~63000KVA are called large transformers, and transformers above 90,000KVA are called large transformers. The compressor is called a super-large transformer.