The three-phase barrier transformer adopts a three-phase double-winding structure, which has the characteristics of lightning protection and anti-disturbance. Each winding on the primary and secondary sides is divided into two coils, which are wound from two layers of metal foil insulated from each other. So there is capacitance C (capacitance barrier transformer) between the two coils. The following two wiring methods can then be combined as needed:
Barrier transformer
Voltage conversion function (e.g. △/yo or yo/△ (connection)
Filtering and anti-turbulence (e.g., the ability to eliminate third harmonic turbulence). It can eliminate odd harmonic disturbances
It can effectively slow down the disturbance harmonics and lightning electromagnetic pulses on power lines; It can effectively slow down the disturbance harmonics generated by the electronic equipment of the system into the distribution network, and form disturbance to other equipment (equipment, systems);
Fundamentally avoid abnormal operation, data loss or error caused by ground potential disturbance of the system;
It can usefully avoid the sharp rise of the steel bar potential as a reference ground when the lightning protection equipment of the building is grounded, and the hardware equipment in the system is destroyed by counterattack.
Barrier transformer
Characteristics of the barrier transformer at the input end of the AC power supply:
a。 When the third harmonic and disturbance signal are serious, a barrier transformer can be used to eliminate the third harmonic and disturbance signal.
b。 The use of barrier transformers can generate new neutral wires, and avoid the abnormal operation of equipment caused by defective neutral wires in the power grid.
c。 Current waveform distortion caused by nonlinear loads, such as third harmonics, can block without polluting the grid.
Characteristics of the blocking transformer at the output end of the AC power supply:
d。 In order to avoid the current distortion of the nonlinear load affecting the normal operation of the AC power supply, polluting the power grid, and purifying the power grid.
e。 By sampling the input terminal of the barrier transformer, the distortion of the nonlinear load current does not affect the sampling accuracy, and the control signal that can reflect the actual situation is obtained.
f。 If the load is unbalanced, it will not affect the normal operation of the regulated power supply.
|
More on that
|
Frequency conversion speed regulation of several special motors - Senlan frequency converter
A. Wound rotor asynchronous motor
The rotor winding of the wound rotor asynchronous motor is a set of three-phase windings with star connection. The end points of the three-phase winding are connected to the three collector rings, which are connected to the brushes and the external resistor (for starting or speed regulation) through the collector rings. Select inverter ...
|
|
Overvoltage treatment method caused by load input side - Senland
(1). The deceleration time of the frequency conversion parameter is increased or free parking is adopted
Assuming that the overpressure phenomenon is present in the parking process, the process has no parking requirements for the parking time or direction, and the deceleration time can be increased appropriately. The reason for the overvoltage in the parking process is that after the frequency conversion announces the deceleration command, the motor ...
|
|
The reason why the frequency of the inverter cannot be adjusted - Senlan inverter
If there is no damage to the hardware, the maximum torque output of the inverter is generally less than the load to increase the torque.
The acceleration time is too short
...
|
|
Sunland inverter helps the green development of non-ferrous metal mining
From October 28th to 29th, the "First National Tailings Engineering and Comprehensive Utilization Skills Seminar" sponsored by the China Nonferrous Metals Society was successfully held in Dexing City, Jiangxi Province. From China Nonferrous Metals Society, China ENFI, Jiangxi Copper, Beijing Institute of Mining and Metallurgy, University of Science and Technology Beijing and other countries...
|
|
Analysis of Sunland inverter fault anomaly
|
|
Sunland inverter soft start advantages
Sunland inverter and soft start is a first-class, reliable and reliable motor control system, which is able to meet the needs of various applications. The advantages of expected Sunland inverters and soft start are:
1. Performance: Expect Sunland inverter and soft start...
|
|
Application of Sunland inverter on gantry milling machine
The gantry milling machine is a machining equipment for processing larger workpieces, and its electrical control system includes two parts: the main transmission of the workbench and the logical control of the feed organization. Henan Jiaozuo Maike Company has a gantry milling machine, which has been used for many years since the 70s. The main drive of the operating table of the gantry milling machine is selected ...
|
|
Common brand inverter modification power method - Senlan inverter
What are the advantages of inverter power correction? Many brands of inverter power boards, driver boards, and motherboards can be universal, as long as the type, volume, and hardware are the same, and the desired power and voltage value can be obtained by correcting the manufacturer's parameters.
...
|
|
The overload capacity of the dry-type transformer - Sunland inverter
Dry-type transformer is a kind of power equipment, and under normal circumstances, dry-type transformer also requires a certain amount of overload, that is, the workload beyond its working ability. So what about the overload of dry-type transformers and how to influence them?
...
|
|
Introduction to the wiring rules of Sunland inverter
It is necessary to separate the signal line from the power line: when using analog signals for long-distance control of the inverter, in order to reduce the disturbance of the analog amount from the inverter and other equipment, please separate the signal line of the control inverter from the strong current circuit (main circuit and sequential control circuit). Inverter ...
|
|
The remote control of the inverter meets the function - Sunland inverter
In general, the long-distance operation of the frequency converter requires the following functions:
1) Long-distance setting, if the parameters only need to be set for the first time, and do not need to be adjusted during operation, then long-distance setting is not required.
2) Long-distance start-stop, long-distance start or stop inverter, and ...
|
|
Inverter classification method - Senlan inverter
1. Classified according to the input voltage level
According to the input voltage level, the inverter can be divided into low-voltage inverter and high-voltage inverter, and the low-voltage inverter is common in China with single-phase 220 V inverter, three-phase 220 V inverter, and i-phase 380 V inverter. High-voltage inverters are commonly used in 6 kV, 10 kV transformers.
|
|
Inverter to avoid load shock - Sunland
In the process of operation, try to ensure that the inverter (hereinafter referred to as -VFD) has a satisfactory acceleration and deceleration time, and the VFD has its own soft start function when starting or accelerating; When the power is shut down or the speed is slowed down, it has the function of soft shutdown. Add acceleration and deceleration times as much as possible within the range promised by the device. When the device requires ...
|
|
Limit switch wiring method - hope Senlan
Limit switch is an electromechanical control element used to detect the direction of the movement of the machine or equipment, and send a signal when the specific position is in a specific direction to control the operation or stop of the equipment. It is often used in industrial production processes, such as CNC machine tools, conveyors, loading and unloading robots, etc.
...
|
|
The basic requirements of VFD installation design - Sunland inverter
(1) The VFD should be installed in the control cabinet.
(2) The VFD is best installed in the center of the control cabinet; The VFD It should be vertically installed with the top and bottom protected from large parts that may obstruct the exhaust and intake.
(3) VFD control cabinet or partition, or the upper and lower parts of the necessary device ...
|
|
Servo motor regular diagnosis and repair method - Senlan
1. Common faults of motor heating up too high or smoke motor
Causes: 1. Excessive load; 2. Two-phase operation; 3. Blocked air duct; 4. The working temperature is too high; 5. Interphase or inter-turn short circuit fault of motor stator winding; 6. Motor stator winding grounding device; 7. The power supply voltage is too high or too low;
Overhaul...
|
|
Introduction to the speed regulation mode of inverter motor - Senlan
1. Mechanical speed regulation form
There are three methods of mechanical speed regulation: electromagnetic clutch, hydraulic coupling, and viscous clutch. Among them, the hydraulic coupling device is widely used, that is, a hydraulic coupling device is connected in series between the motor and the load, and the concave and convex liquid level is used to adjust the hydraulic coupling between the motor and the load.
|
|
Inverter protection and braking force issues – Sunland
1. What is regenerative braking?
If the motor decreases the command frequency during operation, the motor becomes an asynchronous generator and works as a brake, which is called regenerative (electrical) braking.
2. Can you get more braking power?
Regenerated from the motor ...
|
|
The harm of low temperature to the inverter - Senlan
Most VFDs are suitable for -10°C-50°C, and if the temperature is too low, the VFD will be affected.
Precautions for low-temperature operation of VFD:
1. VFD should be operated in an environment above minus 10°C as much as possible, preferably indoors.
|
|
Sunland's measures to reduce inverter failure
According to the test, the service life of the inverter is halved for every 10°C increase in the operating ambient temperature. For this reason, in daily use, a reasonable maintenance cycle and guidelines should be formulated according to the actual operating environment and load characteristics of the inverter.
|
|
Contact
working hours
