What are the commonly used power supply and distribution methods between equipment?

2009-05-30 14:22 Satisfactory answer: The link in the power system that is directly connected to the user and distributes electric energy to the user. The distribution system is composed of a distribution substation (usually the transmission voltage of the power grid is reduced to a distribution voltage), a high-voltage distribution line (that is, a voltage of more than 1,000 volts), a distribution transformer, a low-voltage distribution line (a voltage below 1,000 volts) and corresponding control and protection equipment.

The distribution voltage is usually 35 60 kV and 3 10 kV, etc.

The commonly used AC power supply methods in the power distribution system are: three-phase three-wire system. It is divided into triangle wiring (for high-voltage distribution, three-phase 220-volt motors and lighting) and star wiring (for high-voltage distribution, three-phase 380-volt motors).

Three-phase four-wire system. It is used for 380 220 volt low-voltage power and lighting hybrid power distribution. Three-phase, two-line, one-place system.

It is mostly used for rural power distribution. Three-phase single-wire system. It is often used for traction power supply for electric railways.

Single-phase two-wire system. Mainly** residential electricity. The DC power supply methods of the power distribution system are:

Two-wire system. It is used for the power supply of urban trolleybuses, subway locomotives, mine traction locomotives, etc. Three-wire system.

**Power plants, substations, distribution stations for their own electricity and secondary equipment, electrolysis and electroplating.

A primary distribution network is a network between the outgoing line of the distribution substation and the entrance of the distribution substation (or distribution station). In China, it is also known as a high-voltage distribution network. The voltage is usually 6 10 kV, and cities mostly use 10 kV distribution.

With the increase of urban load density, 20 kV power distribution schemes have been adopted. The main part of the primary distribution line drawn from the distribution substation is called the trunk line. The part that is branched off by the trunk line is called a branch line.

There is a distribution transformer connected to the branch line. There are two types of wiring methods for the primary distribution network: radial and ring.

The secondary distribution network is a system composed of lines and components between the secondary lead line of the distribution transformer and the user's home line, also known as the low-voltage distribution network. In addition to radial and ring wiring, important users in the city can use double-loop wiring. In urban areas with high electricity load density, grid wiring is used.

This network is powered by multiple primary distribution trunk lines, which are connected to the secondary distribution network through low-voltage fuses after being stepped-down by distribution transformers. Because the adjacent distribution substations in the secondary system are connected to different primary distribution trunks, power outages in the downtown area due to faults in the primary distribution lines can be avoided.

Distribution lines have overhead lines and underground cables according to the structure. Overhead lines can be used in rural areas and small and medium-sized cities, and underground cables should be used in large cities (especially in the downtown area), tourist areas, and residential areas.

The power distribution device is an important part of the power plant and the substation, and it is the specific realization of the main electrical wiring between the power plant and the substation. Including:Control appliances(circuit breakers, disconnectors, load switches, etc.).Protect appliances(fuses, relays and lightning arresters, etc.).Measuring appliances(current transformers, voltage transformers, ammeters, voltmeters) as well as busbars and current-carrying conductors.

The characteristics of the complete set are:

1. Compact structure and small footprint;

2. It can reduce the on-site installation workload and shorten the construction period;

3. Reliable operation, convenient maintenance, easy construction and relocation;

4. It consumes more steel and the cost is higher. The complete set of switchgear power distribution devices is divided into low-voltage distribution panels, high-voltage switchgear, box-type substations and SF6 fully enclosed combined electrical appliances (GIS).

Fire prevention measures. 1. Frequently check the operation of electrical equipment, check whether the joints are loose, whether there are electric sparks, whether the performance of overload and short circuit protection devices of electrical equipment is reliable, and whether the equipment insulation is good.

2. Reasonable selection of electrical equipment. In places with flammable and explosive materials, explosion-proof electrical appliances should be used when installing and using electrical equipment, and insulated wires must be sealed and laid in steel pipes. Electrical equipment should be selected and installed according to the level of ** hazardous places.

3. Maintain a safe installation position. Maintaining the necessary safety distance is one of the important measures for electrical fire protection. In order to prevent electrical sparks and dangerous high temperatures, flammable and explosive materials should not be stacked around electrical equipment that can produce sparks and dangerous high temperatures.

Power Distribution Units:

The power distribution device is an important part of the power plant and the substation, it is a device that is used to receive and distribute electric energy according to the connection mode of the main wiring, which is composed of switching appliances, protection and measuring appliances, bus bars and necessary auxiliary equipment. A power distribution device is a general term for an electrical device that can control, receive, and distribute electrical energy.

Electrical Equipment Included:

Because it is functionally complete, it must have various functions of electrical equipment in the power distribution device. Such as combiner bus, circuit breaker, disconnector, reactor, lightning arrester, voltage transformer, capacitor, cable and measuring instrument and other secondary equipment. The power distribution device can generally be divided into units with a section of bus as a node.

According to the difference in voltage level and layout structure, it can be divided into indoor and outdoor power distribution devices or voltage level power distribution devices.

As the name suggests, a power distribution device is a distribution device used to measure and control electrical energy. It is composed of power supply, busbar, switchgear, protective appliances, measuring instruments and other accessories. Its layout should meet the requirements of the normal operation of the power system, facilitate maintenance, and not endanger the safety of people and surrounding equipment.

This has to be said by piece current transformer, voltage transformer, busbar, disconnector, circuit breaker, lightning arrester, grounding switch, live display, voice alarm, electrical, mechanical five-party lock, voltmeter, ammeter, power meter, relay protection device, capacitor, background monitoring and metering system.

A power distribution device is a device that receives and distributes electrical energy. It is composed of busbars, switchgear, protective appliances, measuring instruments and other accessories.

Power distribution units include:

1. Switching electrical appliances (circuit breakers, isolation switches, load switches, etc.);

2. Protection appliances (fuses, relays, lightning arresters, etc.);

3. Measuring electrical appliances (current transformer, voltage transformer, ammeter, voltmeter, etc.) 4. Bus bar and current-carrying conductor.

The power distribution device can be divided into indoor power distribution device and outdoor power distribution device according to the place where it is installed, and is divided into high-voltage power distribution device and low-voltage power distribution device according to its voltage level, and is divided into complete sets of power distribution device (switch cabinet) and prefabricated type according to its structural form.

It is mainly divided into primary equipment and secondary equipment.

Primary equipment: transformers, circuit breakers, lightning arresters, capacitors, disconnectors, contactors, reactors... Wait.

Secondary equipment: current transformers, voltage transformers, transfer switches, buttons, indicators, current and voltmeters, relays... Wait.

What are the ways to introduce power distribution + common power supply in civil buildings?

What are the ways to introduce power distribution + common power supply in civil buildings? Kiss! Hello, I am glad to answer for you<> there are three types of wiring methods for the power distribution system of civil buildings in principle:

Radial, trunk, ring. Common power supply introduction methods: when a single building, a small building or a small load of electrical equipment (and below), and are single-phase and low-voltage electrical equipment, a single-phase 220V power supply can be directly introduced overhead from the 10-column transformer of the city power grid.

If the building is large or the load of electrical equipment is large (250kw and below), or there is three-phase low-voltage electrical equipment, the three-phase four-wire power supply can be directly introduced overhead by the 10-column transformer of the city power grid. If the building is very large, or the load of electrical equipment is very large (250kw or the power supply transformer is more than 160kva), or there is 10kV high-voltage electrical equipment, the power supply voltage should be high-voltage power supply. Hope mine can help you <>

Do you have any other questions?

The power supply and distribution system consists of: high and low voltage distribution lines, substations (including distribution stations) and electrical equipment.

1. High and low voltage distribution lines: lines that send power from step-down substations to distribution transformers or power from distribution substations to power consumers. The voltage of the distribution line is called the high-voltage distribution line;

The distribution voltage does not exceed 1kV, the frequency does not exceed 1000Hz, and the DC does not exceed 1500V, which is called a low-voltage distribution line. The construction of distribution lines requires safety and reliability, maintaining the continuity of power supply, reducing line losses, improving transmission efficiency, and ensuring good power quality.

2. Substation: a place where voltage and current are converted in the power system, and electric energy is received and distributed. The substation inside the power plant is a step-up substation, which is used to boost the electrical energy from the generator and feed it into the high-voltage grid.

The electrical equipment in the substation is divided into primary equipment and secondary equipment. Primary equipment refers to equipment that directly produces, transmits, distributes and uses electric energy, and secondary equipment refers to equipment that measures, monitors, controls and protects the operating conditions of primary equipment and systems.

3. Electrical equipment: Electrical equipment can be divided into power electrical equipment, process electrical equipment, electric heating electrical equipment, experimental electrical equipment and lighting electrical equipment according to their use.

Traditionally, the power system is divided into three major systems: power generation, transmission and distribution.

The electrical energy generated by the power generation system is transmitted through the transmission system and finally distributed to individual users by the distribution system.

In general, the section of the power system that exports from the step-down distribution substation (high-voltage distribution substation) to the user is called the distribution system.

The power distribution system is a power network system composed of a variety of distribution equipment (or components) and distribution facilities to convert voltage and directly distribute power to end users.

1. The power supply mode is divided into the following types:

1) According to the voltage, it is divided into high-voltage and low-voltage power supply.

2) According to the number of power supplies, it can be divided into single power supply and multi-power supply.

3) According to the number of power phases, it is divided into single-phase and three-phase power supply.

4) According to the power supply circuit, it is divided into single circuit and multi-circuit power supply.

5) According to the metering section, it is divided into meter installation and Peihong non-meter power supply.

6) According to the period of electricity consumption, it is divided into temporary electricity consumption and formal power supply.

7) According to the management relationship, it is divided into direct and indirect power supply.

2. If the flowmeter is far away from the control room, it is best to choose 220VAC electromagnetic, because the cable is too long, the signal will attenuate, and an external 220VAC power supply is required for voltage stabilization. The 24V power supply electromagnetic flowmeter is mainly used in the industrial site where the use of alternating current or low-voltage direct current is not allowed from the safety aspect, or the distribution current totalizer is supplied by the totalizer to the electromagnetic flowmeter, and only 24V can be selected. In the case that the flowmeter is not far from the control room, you can choose 24VDC electromagnetic, which will indeed save power supply, and the cable is laid to walk the bridge without holding the partition.