Thyristor Controlled Rectifier

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Product Code : 08

Product Specification

Thyristor Controlled Rectifier:
Depending on power levels and customer's harmonics specifications converter grade thyristors are employed to build either and pulse (Single Rectifier), 12 Pulse (Dual Rectifier in Series) or 24 Pulse (Quad Rectifier in Series) Rectifier assemblies.

Static Frequency Converters

The Megatherm Static converters are the result of development from experience in solving Induction Heating & Melting problems for the Industries. Design have been re-engineered to achieve easy maintenance, minimum breakdown and operate continuous operation at full power under all adverse site conditions. A high availability rate and higher operating efficiency are the salient features. Megatherm converters are equipped with proven reliable parallel resonant type Inverters for the entire frequency range.

Available Models

Melting Series I (Foundry)

Capacity (KG)	50	75	100	150	200	300	500	750	1000
Rated Power Output (KW)	50	100	100	125	150	200	350	450	550
Power Variation	5% to 100%
Max Frequency (HZ)	3000	3000	3000	3000	3000	1000	1000	1000	1000
Input Supply Voltage (Volts)	415	415	415	415	415	415	415	415	660
Input (KVA)	55	82	110	135	165	220	380	500	610

Melting Series II (Foundry)

Capacity (KG)	1500	2000	3000	3500	4000	5000	8000	10000	12000	15000
Rated Power Output (KW)	1000	1250	1500	1600	1800	2500	3000	4500	5500	6500
Power Variation	5% to 100%
Max Frequency (HZ)	500	500	500	500	500	500	500	400	300	300
Input Supply Voltage (Volts)	660	850	850	1250	2x850	2x850	2x850	2x850	2x850	2x850
Input (KVA)	1080	1360	1630	1740	1960	2720	3260	4900	6000	7100

Heating Series III

Rated Power Output (KW)	25	50	75	100	150	200	250	300
Power Variation	5% to 100%
Max Frequency (KHZ)	50	50	25	10	10	10 / 3	10 / 3	10 / 3
Input Supply Voltage (Volts)	3Ph- 415V- 50Hz
Input (KVA)	35	70	107	142	210	285	350	425

Technical Characteristics

Megatherm's Static Frequency Converters mainly consist of Rectifier, DC link and Inverter. The rectifier consist of one or more fully controlled three phase bridges employing the latest semi-conductor technology and digitally controlled special phase locked loop synchronization enabling power source to operate with mains as well as Gas/Diesel generator sets easily. This design allow infinitely variable adjustment of converter output between 5% to 100% of its rated power capacity. The DC link circuit consists essentially of water cooled reactors with special type of winding. The DC link circuit smoothens the current from rectifier which is fed to the inverter. Moreover, the smoothing choke prevents an excess rise of current in the DC link circuit in the event of a short circuit on the load. On each switch off, the flow pattern in the rectifier is reversed, so that magnetic energy stored mainly in the DC link circuit is feed-back into the mains. High speed semi-conductor fuses are fitted to protect the power thyristors.

Inverter consists of one fully controlled single phase bridge employing the latest high speed distributed gate Thyristor or Insulated Gate Bipolar Transistor (IGBT). By alternate switching on/off of the inverter device, an alternating current is produced in a load circuit. The inverter electronics control ensures that inverter runs at the frequency determined by the natural resonance created by the load.

Power conversion efficiency of Megatherm panels is very high. At 500Hz. frequency the efficiency is 97% and between 10 Hz. to 50 KHz. is 91%. The main advantage is that efficiency together with instant readiness for operation and reliable starting offer excellent possibility of controlled energy savings on different type of parallel compensated resonant load circuits

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