All large AC power blocks are connected by a three-phase transformer for transmission and distribution at high voltage levels. Single-phase transformers can be electrically connected to form a three-phase transformer bank in a distribution system. But the standard is to combine a single phase coil into a three-phase transformer unit on a common core. The advantages of using a single-cell three-phase transformer over three single-phase transformers include:
A single three-phase transformer will operate more efficiently than three single-phase units.
Compared to a transformer bank consisting of three single-phase transformers, the busbar structure, switchgear and wiring used for three-phase transformers are simpler to install and easier to arrange.
Compared to three single-phase units, three-phase transformers are lighter in weight and require less space.
The price of a single three-phase transformer is lower because less core information is required regarding the equivalent kVA rating of the three single-phase units.
The primary advantage of using a single phase transformer unit in the event of a fault. In the case of a single three-phase transformer, if there is a problem with the supply winding of one phase, the operation of the entire three-phase unit must be stopped. If a single-phase transformer in a three-phase group fails, it can usually be disconnected and partially serviced until replacement is stopped. However, the reliability of modern transformers is so high that most large transformers are three-phase.
Delixi three-phase transformers are usually designed and constructed for specific voltages. For example, transformers are capable of having a Delta primary of 4800 volts and a Wye secondary of 120/208 volts. A three-phase transformer has a core with three sets of windings. The primary and secondary windings are placed one after the other on the three feet of the corn cob.
Single-phase transformers can also be used to form a three-phase transformer bank. When connecting a single-phase transformer to form a three-phase voltage system, it is important to be the same. Their voltage, kVA, impedance, manufacturer and type should be the same.
The three-phase transformer connection is named after the connection method of the voltage winding inside the transformer. With regard to balanced loads, a three-phase "star" (also known as a delta joint) is used as a connection, in which one end of each winding of a multiphase transformer is connected to a common point (neutral point) and the other end is connected to its corresponding line and phase terminals. The polarity mark is fixed to any transformer. Delixi Electric in the high-voltage transformer coil star connection, the polarity of H2 coil ends are connected together. The H2 terminal is then connected to the neutral line (N). The wires (A, B, and C) are then connected to each of the other H1 coil ends.
|
More on that
|
Delixi inverter CDI-E180 series of introduction
Product Introduction
With optimized open-loop vector control, V/F control, closed-loop vector control, stable function, rich functions, it is a high-performance vector inverter, which can be widely used in speed control accuracy, torque echoing speed, ...
|
|
Delixi circuit breaker insulation accident
The circuit breaker insulation incident can be divided into the internal insulation terminal and the external insulation incident. The hazards caused by internal insulation incidents are generally greater than those of external insulation.
(1) Internal insulation incidents
The internal insulation end is mainly a bushing and a current transformer ...
|
|
Delixi spare parts replacement cycle description
1. Cooling fan (2-3 years)
As long as the inverter is in use, the cooling fan has always been running, so the cooling fan is generally the shortest service life of the accessories, generally after the use of the cooling fan for 2-3 years, the bearings, balls, motors, etc. of the fan are seriously worn, and they need to be replaced.
|
|
Delixi circuit breaker operation failure
Operation failure is manifested by the dragging or misoperation of the circuit breaker. Because the most basic and important function of the high-voltage circuit breaker is to operate correctly and remove the fault of the power grid quickly. If the circuit breaker drags or malfunctions, it will pose a serious threat to the power grid, first of all: (1)) expand the scale of the incident, which may make the original ...
|
|
Delixi relay maintenance method
Relay is a kind of electrical appliance that turns on or off the control circuit according to the change of external input signals, such as electrical voltage, current) or non-electrical quantity (heat, time, speed, etc.) to complete the control or maintenance mission.
|
|
General parameter setting skills of inverter - Delixi
The setting menu of the inverter is divided into a first-level menu, a second-level menu, etc., and the menu is followed by parameters.
If the inverter starts in standby (ready to run) condition, set the FUn-PSS-SP2 parameter to 15Hz, and then return to the standby state operation.
In the practice setting ...
|
|
Delixi voltage regulator fault phenomenon and analysis
Delixi regulator output voltmeter keeps swinging back and forth, and sparks occur at the carbon brush, and the problem phenomenon and cause analysis
1. The contact pressure between the carbon brush and the coil plane is too small
2. The carbon brush is severely worn
Delixi voltage regulator has ...
|
|
Introduction of low dropout linear regulator - Delixi
LDO, or low dropout regulator, is a low-dropout linear regulator that uses a transistor or field-effect transistor (FET) operating in its saturation region to subtract the excess voltage from the input voltage used to generate a conditioned output voltage.
...
|
|
The type of regulated power supply - Delixi power supply
(1) Ferromagnetic resonant communication regulator. It consists of a full choke and a corresponding capacitor, and has a constant voltage volt-ampere characteristic (AC regulated power supply).
(2) Magnetic amplifier communication regulator. The magnetic amplifier and the autotransformer are connected in series, and the impedance of the magnetic amplifier is changed by electronic circuits to stabilize the output ...
|
|
Instrumentation overhaul method - Delixi
Contrasting method
The specific method is to let the problematic meter and the normal meter operate under the same conditions, and then detect the signals at some points and compare the two sets of signals measured, if there are differences, you can conclude that the fault is here. This method requires maintenance personnel to have considerable knowledge and skills.
|
|
Delixi electrical components circuit breaker introduction
What is a Circuit Breaker? What is the function of a circuit breaker? How to choose the right circuit breaker in the work? The circuit breaker is what we often call an air switch. Just like a dam that controls the release of water, when the sluice gate is opened, the flow of water is continuous, and when the sluice gate is lowered, it blocks the flow of water.
...
|
|
Delixi occasion to choose the inverter
We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct selection of the type of inverter.
When selecting the inverter, the current value of the actual motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, the output of the inverter should be fully considered ...
|
|
The structure of the inverter - Delixi
The main circuit is the power conversion part that supplies the voltage regulation and frequency modulation power supply to the asynchronous motor, and the main circuit of the inverter can be roughly divided into two categories: the voltage type is the inverter that converts the DC of the voltage source into a communication inverter, and the filter of the DC loop is the capacitor. The current type is to convert the DC of the current source into a communication ...
|
|
Delixi frequency converter E series precautions
1. Before the inverter device is in place and debugged, please tighten the components, especially the connecting bolts of the wire part, if not tightened, the connection will be heated and cause fire.
2. The on-site planning of the installation should be reasonable, and the excellent ventilation environment should be maintained.
3. The incoming and outgoing power lines of the inverter are not ...
|
|
Delixi time control switch KGL1 latitude and longitude technical parameters
Delixi Electric KGL1 latitude and longitude time control switch is suitable for communication 50Hz operating voltage 380V and the following control circuits, Delixi time control switch, according to the local latitude and longitude, according to the season to change the automatic adjustment control time, as the timing of the implementation of components. Plugging in or out of all sorts of ...
|
|
CDQ1F series PC-level excitation automatic transfer switch - Delixi
Delixi Electric's newly launched CDQ1F series PC-level excitation active transfer switch, with more complete specifications and stronger functions, the power-off time can be shortened to less than 0.1s, escorting the continuous use of electricity in important places!
CDQ1F Active ...
|
|
Delixi time control switch how to adjust the control time
1. Check the time first, if the time of the week, hour and minute is correct, don't care. If it's not correct, you need to take care of it yourself. Conditioning is very simple, you just need to press the clock, and then adjust the week by week, the hour of conditioning, and the minutes of conditioning.
...
|
|
The reason for the heat and heat of the switch socket in Delixi
1. The socket quality is low quality
First of all, we should check whether the socket is a miscellaneous and inferior product, the copper clamping force in the defective socket is not good, resulting in poor contact between the socket and the plug, and the socket and plug will heat up after a long time of electrical use. So be sure not to buy cheap miscellaneous ...
|
|
Delixi EM60 series inverter to factory settings
First, the process of inverter rehabilitation factory value
1. Study the manual and find the corresponding function number, or key combination.
2. Confirm that the parameters can be corrected (sometimes the inverter will set the parameter to write the protection function in order to prevent the parameters from being changed randomly, and the password must be guaranteed to enter the correction) ...
|
|
Switching power supply FAQ - Delixi
1. The safety wire is blown off
In a general environment, a blown safety wire indicates that there is a problem with the internal wiring of the power supply. Because the power supply is operated in the shape of high voltage and high current, the fluctuation of the grid voltage and the surge city cause the current in the power supply to increase suddenly and cause the safety wire to be blown off. The focus should be on checking the power ...
|
|
Contact
working hours
