The ferromagnetic resonance of the bus system is divided into parallel ferromagnetic resonance and series ferromagnetic resonance. Parallel ferromagnetic resonance refers to the resonance loop composed of the ground capacitance of the bus system and the nonlinear inductance of the bus electromagnetic voltage transformer (primary neutral grounding) in the neutral ungrounded system or the small current grounding system. Series ferromagnetic resonance refers to the resonance loop composed of the voltage equalization capacitor at the break of the circuit interrupter of the high-current grounding system and the nonlinear inductance of the bus electromagnetic voltage transformer.
(1) The result of ferromagnetic resonance: when the resonance is generated, the system will present overvoltage, and the weak part of the insulation will be broken down; lightning arrester fire; The bus voltage transformer is incinerated due to the rapid saturation of the iron core, which causes overcurrent.
(2) Similarities and differences between ferromagnetic resonance and grounding phenomenon: when ferromagnetic resonance occurs, grounding signals will also be presented due to the existence of zero sequence components and higher order components in the power supply voltage, but there is no problem in the practice of the system. At this moment, the change of the voltage relative to the ground is very different from the phenomenon when it is grounded.
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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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Wiener fixed and busbar mounting
Precautions for the device
VDE 0660 Specification Section 107 / EN 60947-3 Specification / IEC 60947-3 Specification
3 poles are broken at the same time, double breakpoints.
Operator-independent, safe opening/closing, in position ...
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Introduction of busbar, busway and busway bridge - Vernal
generatrix
In the field of electricity, the busbar can also be called the busbar, busbar, etc., most of which refer to the busbar or power supply trunk in the high and low voltage cabinet, which is used to connect multiple electrical lines. The system will install various interface cards through the bus, and transmit various data to the devices connected to the interface cards.
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Wiener looks at the busway drawing method
First, in the CAD system drawing, it is a plan of the bus duct, and two parallel polylines can indicate the bus duct.
2. The busway includes the following parts:
1. Feeder busbar, which is used to transmit electricity
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Introduction to several power supply systems – Wienal
At present, China has five power supply systems: IT, TT, TN-c, TN-c-s and TN-S. They have their own advantages and disadvantages, and we should choose sensitively according to the actual situation in life.
Five power supply systems
1.IT power supply system
In a ...
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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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Strip Switch vs. Disconnector Circuit Breaker Comparison – Wiener
Bar switches are different from regular switches. They are critical to ensuring effectiveness. For example, when the current exceeds a certain amount of time, they cause heat to be generated, allowing the fuse to switch the fuse to further assist in breaking the circuit. Therefore, as a kind of current protection device, they can achieve ...
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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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Example of the application of the Wiener busbar system
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Bus voltage non-system equipment failure and solution - Wienal
In order to ensure the safe and economical operation of the power system and its power generation, supply and electrical equipment, power grid users require the voltage to operate in three ways: forward voltage regulation, reverse voltage regulation and constant voltage regulation. However, when the power grid is in practice, due to the change of active and reactive power output, the increase or decrease of electricity load, and the system wiring party...
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Wiener Data Center Bus System
Although the service life cost of the busbar system is usually lower than that of the traditional wiring method, the busbar system still bears a considerable cost compared to other structural elements of the water supply and drainage or HVAC system.
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Avoidable failures in busbar systems – Wienal
Cause of bus failure
1. The internal network of bus insulators and breaker sleeves caused by surface pollution
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3. The support of the circuit breaker or isolation switch caused by the reverse operation ...
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Vernal fuse replacement method
1. Prepare for replacement. For example, construction personnel should wear labor protection equipment, such as insulating gloves.
2. Confirm the fault type. Check the distribution box with a test pen first, confirm that there is no leakage, and then open the distribution box door. Then use the voltage tester to detect the three-phase power supply, if the three-phase ...
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Low-voltage cabinet for capacitance compensation – Wienal
Capacitor compensation is indispensable in low-voltage cabinets, so what is the effect of capacitor compensation. The meaning of this is that it acts as a capacitor. Let's take a look at the principle of capacitor compensation first, when the capacitor is compensated, the capacitor and the load are connected in parallel, and the capacitor is like a bin. When the load increases, the power supply has internal resistance, so that ...
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Features of busway power supply system - Wiener
1. Trunk power distribution system, simple wiring and reliable operation.
2. It is convenient to tap, and you can tap without cutting off the main power supply. Large power supply capacity up to 6300A current-carrying capacity.
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Development of the busbar trunk system – Wiener
(1) Air-type busway
Since the mid-50s of the last century, represented by Beijing Baizhifang Airport Electrical Appliance Factory, the conductive row has been supported in the shell with insulating liner and insulated by air medium. The phase-to-phase distance is 50mm.
(2) Secret ...
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Advantages of pluggable busway
1. The plug-in bus duct has strong overload capacity
The overload capacity of the bus duct is strong, depending on the high working temperature of the insulation material it uses, and the working temperature of 105 is selected for the insulation data used in the bus duct, and the radiation cross-linked flame retardant winding tape with a working temperature of more than 140 °C has been developed.
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Difference Between Busbar and Cable – Vernal
When the busway has not been developed and introduced, the cable is still an indispensable figure in the low-voltage power distribution system, when the busway system is introduced and widely used. Whether to choose the cable or the bus duct has become a topic of endless debate.
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Temperature rise requirements and safety of Wiener busway
With the rapid development of our economy and technology, the trend of urbanization is becoming more and more popular, and people's electricity consumption is also increasing. In this case, the busway has developed significantly, and the use of instead of cable has become the development trend of the times. Therefore, what are the requirements for the temperature rise of the busway and ...
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