GGP Carbon Steel Round Pipe Solid State High Frequency Tube Welder

GGP Carbon Steel Round Pipe Solid State High Frequency Tube Welder   1. Application of 800kW solid state high frequency tube/pipe welding machine Pipe specification: 165~355mm Pipe specification: 6~14’’ Pipe thickness: 6.0~14mm Pipe type: Round /square /rectangular Welding mode: Induction/contact welding Welding speed: 10~40m/min   2. Main Technical Index of 800kW solid state high frequency tube/pipe welding machine 2.1 Designed parameters  Nominal power:800kW Rated DC power: Pd=960kW Rated DC voltage: UdN=450V Rated DC current: IdN=2130A The whole efficiency: η>85% Output power: Pout >800kW Designed frequency: f=150~250kHz  MOSFET inverter: 120kW×8 circuit output mode: no welding transformer output, secondary resonance   2.2 Power distribution requirements  Nominal power:800kW Rated DC power: Pd=960kW Line-in power factor: COSφ0.9 Power distribution capacity: S<1070kVA Power supply voltage: 3-phase 380V/50Hz Line-in current: I=1740A Line-in cable: each phase adopts three pcs of 240 copper cable, 3-phase 4-line   3. Composition of 800kW solid state high frequency tube/pipe welding machine

Equipment	Composition	Quantity
800KW solid state HF welder	Dc power cabinet	1 set
	Inverter output cabinet	1 set
	Central control console	1 set
	Cooling system	1 set
	Rectifier isolation transformer	1 set
	Adjustable bracket	1 set

  4. Brief introduction for solid state high frequency tube/pipe welding machine 4.1 DC power cabinet Designed with integration of switchgear cabinet and rectifying part, besides achieving switchgear cabinet functions, it also has rectifying control functions of solid state H.F. welders. l           Installed line-in switch, line-in current meter, voltage meter (can be switched) and line-in voltage indication lamp; l           Installed 3-phase full-controlled thyristor rectification bridge to realize power adjustment of the HF welder; l           Installed flat-wave reactor, flat-wave capacitor and filter to improve the flat-wave coefficient.   4.2 Inverter output cabinet l           The inverter part is consisted of MOSFET single-phase inverter bridge connected in parallel. The power of single-phase bridge is 120kW; the inverter bridge adopts the building block method to realize power superposition. Every piece of bridge plates is designed in the shape of a drawer, which is very easy to install and repair; l           The matching transformer is adopted for power combination, also it adopts the output method by of secondary resonance and non-welding transformer, tank circuit resonance capacitor (low voltage) resonates with the inductor directly, and the output pole plate offers required power transmission for pipe welding; l           Adopted sealed equipment case, installed with air conditioner.   4.3 Central control console The switchgear rectifying cabinet and the inverter output cabinet are connected with optical fiber, so as to make sure control system can not be disturbed by HF signal, which enhances the reliability of equipment.   4.4 Cooling system Circulation soft water is used as cooling water with temperature and water level indicator and protection, which can perfectly accomplish the cooling work for rectifying cabinet, inverter cabinet and resonance tank circuit. air/water cooling system are optional.   4.5 Rectifier Isolation Transformer It realizes solid state H.F. welder remote operation and power regulation, installed with LCD which indicates armature voltage, field voltage indication and of DC drive and DC voltage, DC current indication of H.F. welders.   4.6 Adjustment device Applied to install inverter output cabinet and adjust inductor position. 2-D is for induction welding mode; 3-D is for contact welding mode.