Isolation transformer specific uses -120 208 transformer bank

Product Overview:
Isolation transformer refers to the transformer with electrical isolation between the input winding and the output winding. The isolation transformer is used to avoid accidentally touching the live body at the same time. The isolation of the transformer is to isolate the respective current of the original secondary winding coil.Early for European countries used in the power industry, widely used in the electronics industry or industrial and mining enterprises, machine tools and mechanical equipment in the general circuit control power supply, safety lighting and indicator power.A special transformer with high insulation strength between primary and secondary side windings to isolate different potentials and suppress common-mode interference.The isolation transformer ratio is usually 1:1.
Product function:
1, the principle of isolation transformer and ordinary transformer principle is the same.They all use the principle of electromagnetic induction.Isolation transformer generally refers to 1:1 transformer.By virtue of the secondary disjointed.There is no potential difference between the secondary wire and the ground.Safe to use.Commonly used for maintenance power supply.
2, isolation transformer is not all 1:1 transformer.The power supply for Inschdaine control transformers and vacuum tube equipment is also an isolation transformer.Power sources such as tube amplifiers, tube radios and oscilloscopes and lathe control transformers are isolating transformers.For example, 1 to 1 isolation transformer is commonly used for safety maintenance of color TV sets.Isolation transformer is used more, in the air conditioning is also used.
Isolation transformer commonly known as safety transformer, it is generally used to isolate the impurities of the grid and maintenance equipment.Use isolation transformer first to understand the power supply system in our country. When supply to low-voltage users, the three-phase four-wire system in our country is generally adopted, neutral grounding line, popular point, that is, the wire to residents' homes, one is phase line (live line), the other is zero line, which is in the same position with the earth. When the human body hits heat floor, it will make the current pass through the human body.And the earth form a circuit, causing electric shock hazard.If the isolation transformer is used, it will be safer, because the primary and secondary are through the magnetic field exchange energy, there is no physical hard connection, even if the human body touches the charged items, because the human body and the earth will be the same status, and the potential of the charged part is low potential, will not cause electric shock harm.Inductive voltage regulator such as human electrocution is usually the process of conductor electricity flowing into the earth through the human body, and the reason why he will flow into the earth is because his power supply equipment has an electrical relationship to the earth [namely neutral grounding], if there is no such electrical relationship, then people will not be electrocuted
Isolation transformer is coupling transformer and autotransformer difference in the winding, autotransformer only a group of coils, coil pull a head to do the side coupling roughly consciousness is mutual influence, many fields have this statement, in addition, there is coupling there is decoupling, means to eliminate the mutual interference between the two objects of the transformer, mainly used for isolation interference,Limit the energy of the secondary side (safety gate). Under normal circumstances, the output of the secondary side tracks the input of the primary side, which is equivalent to the path;When the fault occurs, the primary secondary side is disconnected
Isolating transformer properties
Isolation transformer belongs to the safety power supply, generally used for machine maintenance with protection, lightning protection, filtering function.
Principle of isolation transformer:
The principle of isolation transformer is the same as that of ordinary transformer.They all use the principle of electromagnetic induction.Isolation transformer generally refers to 1:1 transformer.By virtue of the secondary disjointed.There is no potential difference between the secondary wire and the ground.Safe to use.Commonly used for maintenance power supply.
Isolation transformers are not all 1:1 transformers.Power supplies for control transformers and vacuum tube devices are also isolation transformers.Power sources such as tube amplifiers, tube radios and oscilloscopes and lathe control transformers are isolating transformers.For example, in order to maintain the safety of color TV often 1:1 away from the transformer.Isolation transformer is used more, in the air conditioning is also used.
Although the primary and secondary windings of the transformer also have the function of isolating the circuit, the capacitance between the two windings will still cause electrostatic interference between the two sides of the circuit in the case of higher frequency.In order to avoid this interference, the primary and secondary windings of the isolation transformer are generally placed on different core columns to reduce the capacitance between them;The primary and secondary windings are also concentric, but electrostatic shielding is added between the windings to obtain high anti-interference characteristics.
Electrostatic shielding is to set a piece of non-closed copper sheet or non-magnetic conductive paper between the primary and secondary windings, known as the shielding layer.Copper sheet or non-magnetic conductive paper is connected to the housing by wire.Sometimes in order to achieve better shielding effect, the transformer is also covered with a shielding housing.The lead wire terminal of the winding is also shielded to prevent other external electromagnetic interference.In this way, there is only residual magnetic coupling between the primary and secondary windings, and the equivalent distributed capacitance between them can be less than 0.01pF, thus greatly reducing the capacitance current between the primary and secondary windings, and effectively inhibiting all kinds of interference from the power supply and other circuits.
There are two points to note when using isolation transformers.
1: The secondary ends of the transformer can not be grounded,
2: The human body can not touch the secondary ends at the same time, otherwise, there is the risk of electric shock.
3. Although the primary and secondary windings of the transformer also have the function of isolating the circuit, the capacitance between the two windings will still cause electrostatic interference between the circuits on both sides in the case of higher frequency.In order to avoid this interference, the primary and secondary windings of the isolation transformer are generally placed on different core columns to reduce the capacitance between them;The primary and secondary windings are also concentric, but electrostatic shielding is added between the windings to obtain high anti-interference.
4. Electrostatic shielding is to set a piece of non-closed copper sheet or non-magnetic conductive paper between the primary and secondary windings, which is called the shielding layer.Copper sheet or non-magnetic conductive paper is connected to the housing by wire.Sometimes in order to achieve better shielding effect, the transformer is also covered with a shielding housing.The lead wire terminal of the winding is also shielded to prevent other external electromagnetic interference.In this way, there is only residual magnetic coupling between the primary and secondary windings, and the equivalent distributed capacitance between the primary and secondary windings can be less than 0.01pF, which greatly reduces the capacitance current between the primary and secondary windings, and effectively inhibits all kinds of interference from the power supply and other circuits. Two points should be paid attention to when using isolation transformer
1. The secondary ends of the transformer should not be grounded.
2. The human body can not touch the secondary ends at the same time, otherwise there is the risk of electric shock.
Laboratory debugging of strong electric equipment, such as frequency converter, servo drive, the common protection measures in addition to good grounding of the metal shell, and the use of isolation transformer.Isolation transformer is a 1 to 1 transformer.Common single-phase and three-phase isolation transformer - primary 220v, secondary is also 220v single-phase isolation transformer, or primary 3 phase 380V, secondary is also 3 phase 380V three-phase isolation transformer.
There are two main benefits of using isolation transformers:
One is safety.We use alternating current mains (220V single-phase) neutral line and the earth is connected, the live line and the earth has 220V AC voltage.People standing on the earth, so with the zero line equipotential, if people contact the fire line, will be electrocuted.Isolation transformer secondary is not connected with the earth, its output is "floating", people contact isolation transformer secondary any one line, because can not form a current loop, will not be electrocuted, so it is safer.The same is true for three - phase four - wire power lines.But it should be noted that if you contact the two secondary lines at the same time, you will be electrocuted!So isolation transformer can not guarantee safety, or always comply with the safety specifications.
The second is to prevent power electronic devices from polluting the power grid.Transformer has a large attenuation effect on high frequency harmonics, so it can avoid the pollution of power electronic equipment to the grid.Of course, the reverse is also true, the noise of the grid will also be isolated by the isolation transformer, to avoid causing interference to the secondary side electrical equipment.
The importance of elevator isolation transformer:
It is mainly to prevent the interference of power grid to power electronic devices.The isolation transformer has a large attenuation effect on high frequency harmonics. The elevator and the isolation transformer can not only stabilize the weak current voltage, but also isolate the grid interference.

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