What is DC link choke?
What is DC link choke?
MTE’s DC LINK CHOKES, also referred to as DC line chokes or inductor chokes, are an economical means of filtering and controlling the DC bus voltage and current in a variable speed drive/inverter. They help reduce AC input line current harmonic distortion while absorbing DC bus voltage spikes.
Why line choke is used?
A choke (or line reactor) is a coil of wire around a magnetic core that creates a magnetic field when current flows through it. This magnetic field increases the impedance of the line and reduces the total harmonic content injected from the drive onto the facilities electrical system.
What does a choke do on a DC motor?
In electronics, a choke is an inductor used to block higher-frequency alternating currents while passing direct current (DC) and lower-frequencies alternating current (AC) in an electrical circuit.
What is line choke in VFD?
A line reactor (also referred to as a “choke”) is a variable frequency drive (VFD) accessory that consists of a coil of wire that forms a magnetic field as current flows through it. Both AC and DC reactors limit harmonic currents.
Where is choke used?
A choke, also known as an inductor, is used to block higher-frequency while passing direct current (DC) and lower-frequencies of alternating current (AC) in an electrical circuit. The name comes from blocking, or “choking”, high frequencies while passing low frequencies.
How does a DC link work?
The DC-link capacitor acts as the PFC stage output filter, absorbing switching currents for minimum ripple voltage. The output stage could be a switched mode converter or inverter taking bursts of high frequency current from the DC-link capacitor.
What is a 3% line reactor?
VFD Protection and Harmonic Mitigation. Advancing Power Quality. Written by: Josh Haase. Quite simply, a 3-phase line reactor is an inductor wired in series between two points in a power system. Reactors are simple electro-magnetic devices, some- times referred to as inductors.
Why chokes are used in VFD?
A choke placed between the drive and the motor also helps to reduce electromagnetic interference from the cables and the possibility of reflected waves. Both “choke” and “reactor” are commonly used terms for an inductive device placed after the input diodes (between the input rectifier and the DC bus link) in a VFD.
How do you choose a choke for a VFD?
Selecting a Line Reactor for VFD applications
- Insulation class – look for 200⁰ C insulation or better.
- Expect a minimum of a 115⁰ C heat rise.
- Ask for VPI (vacuum pressure impregnation) construction.
- Reactors should be designed for both line and load side use, with no de-rating.
Where is choke coil used?
Choke coil is used in fluorescent lamps or tubes, initially it provides a very high voltage and once the gas in the tube is ionized, choke provides a low voltage. Usually it is used to allow DC and blocks AC to pass through the circuit.
Is a choke an inductor?
Why choke is used in VFD?
Why do you need a DC link choke?
User Manual MTE’s DC LINK CHOKES, also referred to as DC line chokes or inductor chokes, are an economical means of filtering and controlling the DC bus voltage and current in a variable speed drive/inverter. They help reduce AC input line current harmonic distortion while absorbing DC bus voltage spikes.
What are DC line chokes for variable speed drives?
1000 Volts DC – Filters 360 Hz Ripple Current – Economical, Versatile Power Quality Solutions For Variable Speed Drives & Inverters. MTE’s DC LINK CHOKES, also referred to as DC line chokes or inductor chokes, are an economical means of filtering and controlling the DC bus voltage and current in a variable speed drive/inverter.
Why are DC BUS chokes better than AC lines?
This is important because the 5 th and 7 th harmonics are the main contributors to total current harmonic distortion, and DC bus chokes do a better job of attenuating these harmonics than AC line reactors do.
Which is better line reactor or DC choke?
Reduces the ripple in DC bus voltage, there by helping reduce the heat loss in the bus capacitor and prolong its life. Reduced AC voltage drop compared to line reactor. Reducing the transient switching current magnitude in to the DC capacitor after a voltage sag (dip) event. Line reactor as well as DC choke helps reduce supply side harmonics.