IEC 61922 pdf download High-frequency induction heating installations – Test methods for the determination of power output of the generator
1 Scope and object
This International Standard is applicable to industrial radio- or high-frequency induction heatinginstallations used for the purpose of thermal applications (e.g. for surface hardening,welding.soldering, melting, forging, zone refining of semiconductors,etc.).
This standard relates to high-frequency induction heating installations in the frequency rangeup to 300 MHz for power levels of 500 w and above，comprising high-frequency generatorsand inductors together with necessary mechanical devices for charge handling (e.g. hardeningmachines).
The main purpose of this standard is to provide the test methods for the determination ofoutput power of industrial high-frequency induction heating power sources.
Loads as described in this standard may be used in compliance assessment of electromagneticcompatibility according to CISPR 11.
This standard relates to generator capacity of operation under continuous rated conditions asspecified by the manufacturer.
The methods of measurement of power output of generators operating in pulse mode with shortduty cycles (e.g. the adiabatic calorimeter) are under consideration.
Electronic systems of power measurement are commercially available, but care must be takenin their application because accuracy can not be guaranteed, particularly at higher frequencies.These instruments require high current transformers and voltage transformers for the outputpower measurements and they also are subject to errors at higher frequencies.These methodsrequire expert knowledge for successful application and therefore are not detailed in thisstandard.
2 Normative references
The following referenced documents are indispensable for the application of this document. Fordated references,only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.
IEC 60050-841，International Electrotechnical Vocabulary (IEV) – Chapter 841: Industrialelectroheating
IEC 60519-1,Safety in electroheat installations – Part 1: General requirements
IEC 60519-3:1988,Safety in electroheat installations – Part 3: Particular requirements forinduction and conduction heating and induction melting installations
IEC 61308:1994，High-frequency dielectric heating installations – Test methods for thedetermination of power output
CISPR 11, Industrial,scientific and medical(ISM) radio-frequency equipment – Electro-magnetic disturbance characteristics -Limits and methods of measurement
For the purposes of this International Standard, the definitions given in IEC 60050-841,IEC 60519-1 and lEC 60519-3 as well as the following, apply.
high-frequency output power
power measured at the power output terminals of the generator, feeding to the test load asdefined in this standard
NOTE This definition is explained in figure 1. The left side of the drawing contains the generator and is limited byits two output terminals. The load is connected to these terminals.All power that appears outside of the generatorcase is defined as the output power of the generator. It comprises the power dissipated in the inductor,powerleads, calorimeter, etc.
device for the measurement of high-frequency power, which consists of a part cooled by water,under controlled flow and measured temperature difference between water inlet and outlettemperatures
NOTE This part is made of steel or other conductive material into which high-frequency currents are induced.
surface power density
quotient of the power and the active surface of the calorimeter
inductor in the shape of a loop brought close to the load without forming a full circle around it