1. Select the type of fuse according to the line requirements and installation conditions. Circuits with small capacity are semi-enclosed or enclosed without fillers; The selection of large short-circuit current has a packing closed type; Semiconductor component maintenance selection of quick fuses.
2. Select the rated voltage of the fuse according to the line voltage.
3. Select the rated current of the fuse according to the load characteristics.
4. The selection of melts at all levels needs to cooperate with each other, the latter stage should be smaller than the previous stage, the current on the main gate and each branch line is not the same, and the selection of fuses is also different. If there is a short circuit in the line, the 15 A and 25 A melts will blow together, and the maintenance characteristics will lose their selectivity. Therefore, this phenomenon will not occur if the main gate and the branch are 2-3 levels different. For example, the outlet of the low-voltage side of a transformer is RT0 1000 / 800, and the motor is RT0 400 / 250 or RT0 400 / 350, and the ratio of rated current between the upper and lower stages is 3.2 and 2.3 respectively, so the selectivity is good, that is, the branch produces a short circuit, and the branch is properly fused and does not affect the power supply of the main switch.
5. The melt can not be picked too small. If the selection is too small, it is easy to show that after the one-phase stable wire is fused, the motor will run out of single-phase operation and burn out; According to statistics, 60% of the burned out motors are formed by improper equipment.
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The main components of the Wiener bus system in the distribution cabinet are composed
(1) Busbar
It is the basic element of the bus system, and there are a variety of standards, which can be installed with 5mm or 10mm thick rectangular busbar, double T type and triple T type busbar. The busbar is divided into 1-4 wires, 1 wire can be used with N or PE, 2 wires can be used together with N and PE, 3 wires are two-phase, and 4 wires can be used for three-phase ...
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Classification of the use of different places in the busway - Vernal
(1) General bus duct
Non-flame retardant and non-fire-resistant bus duct used in general load power distribution. In the event of a fire during a short circuit, it will always incinerate to other connected busbars, which may briefly cause fire accidents.
(2) Flame retardant bus duct
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Precautions for terminal block wiring - Wiener
1. The fastening wiring force should be moderate, avoid sliding the bolts and nuts with excessive force, and replace the bolts and nuts that have been slid in time, and prohibit the operation.
2. When tightening or loosening the screws with a screwdriver, it is necessary to force the screws to ...
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The difference between busway and silicone rubber inverter cable - Vernal
The internal bus duct uses high-quality T2 electrolytic copper as the transmission conductor, which has high purity, high conductivity, low loss and small heating, which is very suitable for industrial and mining enterprises that need large current load operations.
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Closed busway essentials – Wiener
Before the closed busway device, it should be ensured that the electrical shaft, the transformer and distribution room, the decoration project of the place through which the busway passes, and the heating and ventilation project are all completed to ensure that the closed busway is not polluted. The reserved holes and embedded parts of the floor and wall should be embedded and reserved according to the position required by the design.
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Introduction to busbars in Wiener's electrical system
The bus bar is an intermediate link in the voltage distribution device at all levels, and its role is to gather, distribute and transmit electric energy. It is mainly used for the connection of the electrical main circuit between the power plant generator outlet line and the main transformer, the plant transformer and the distribution box, also known as the busbar.
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The technology of the main bus bar in the low-voltage open light cabinet - Winer
One of the characteristics of the Wiener low-voltage switchgear is the multi-functional busbar system. The bus bar is a conductor that connects large electrical equipment such as generators and transformers with various electrical devices. The role of the bus bar is to transmit electric energy with the, and the bus bar is the main equipment constituting the electrical wiring. ...
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NH-Fuse Type Disconnector Instructions for Use
When switching on and off components, you should pay attention to the following:
–In accordance with VDE-0105-100, only operation by electrical professionals or persons with electrical knowledge is allowed (operation without electricity, closing, disconnecting, and replacing fuses ...).
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Conductor and bus welding requirements - Wiener
1. Before welding, it is necessary to check whether the welding equipment is defective, whether the grounding of the electrical equipment is reliable, and strictly abide by the "welder safety operation procedures" when welding.
2. Correct wires and busbars, and prohibit the use of handleless files.
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What is the role of the busbar in the distribution box
Busbar refers to a product made of copper and aluminum materials with high conductivity to transmit electrical energy and have the ability to gather and distribute electricity. The main conductor used by the power station or substation to transport electrical energy. In the power system, the busbar in the distribution box connects the various current-carrying branch circuits in the distribution unit, ...
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Low-voltage dense busway uses and applications
Densely insulated bus duct (hereinafter referred to as bus duct) can be communication three-phase three-wire, three-phase four-wire, three-phase five-wire system, frequency 50-60Hz, voltage to 400V, rated operating current of 250-5000A, mainly as a new type of power supply and distribution equipment in industrial and mining, enterprises and high-rise buildings. Mother with insertion day ...
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Fast protection of medium and low voltage busbars – Wienal
1.It is necessary to install arc light maintenance
Arc maintenance in foreign countries has nearly 20 years of history, the first set of maintenance devices in 1995 has been put into operation, China's previous imported units in the introduction of foreign complete sets of arc light maintenance (such as Guohua Tianjin Panshan Power Plant), domestic units ...
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Wiener bus differential protection switching operation
1. Whether the scale of bus differential maintenance is determined, and whether the maintenance goal is unchanged
Generally, differential maintenance includes bus differential maintenance, transformer differential maintenance, generator differential maintenance and line differential maintenance. The basic principle of achieving differential maintenance is common, i.e. on all sides or on each side...
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Wiener bus adapters are suitable for use with Siemens 3VA1 and 3VA2 circuit breakers
For the use of Siemens' new 3VA1 series circuit breakers in the 30Compact system with currents up to 160A, Wiener has developed an EQUES® bus adapter.
A spring-loaded base and high-performance internal power rails ensure safe connection to the circuit breaker.
advantage
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The difference between busway and busbar - Vernal
The busway and busbar are actually closed one after the other, and the other is not closed.
Closing the busbar is referred to as the busway, which means that the busway is the vest that closes the busbar, and the closing busway and the busbar refer to the same thing.
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Features of Wiener busway
The Wiener busway mainly acts on the aluminum conductor, which has a large current capacity and good electrical and mechanical properties. In addition, it uses a metal trough as the shell, so it is non-flammable, safe and reliable, and has a long service life. Compared with traditional power distribution, the equipment occupies a significantly smaller area and has a beautiful appearance.
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Distribution cabinet bus connection method - Wiener
When users use the distribution cabinet, they must understand the circuit device of the busbar, and many users are not very well understood, so let's talk about the bus connection mode of the distribution cabinet.
The bus bar is used for the internal and external electrical appliances of the distribution cabinet.
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Advantages of busbar mounted electrical equipment - Wiener
The novelty, flexibility and originality of the busbar device appliance. It indicates the vitality of this skill and its broad market prospects. This is the real reason for our attention.
First of all, this small electrical appliance plant was conceived ...
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Precautions for installation of Wiener busway
1. Before the bus duct installation, it should be ensured that the electrical shaft, substation and distribution room, the decoration project of the place through which the bus duct passes, and the heating and ventilation project are all completed to ensure that the bus duct is not polluted. The reserved holes and embedded parts of the floor and wall should be embedded and reserved according to the position required by the design. The functions of the busway are single ...
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Example of the application of the Wiener busbar system
The motor control cabinet uses the Wiener bus system, and the copper bus is used as both a hooking element and a conductive element; The incoming molded case circuit breaker is connected to the copper bar through a special bus adapter, and all the motor maintenance switches and contactors are hooked on the bus adapter in an orderly manner.
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