Download Motor Protection PDF

TitleMotor Protection
Tags Manufactured Goods Relay Fuse (Electrical) Power (Physics)
File Size902.1 KB
Total Pages41
Table of Contents
Table of Contents
Terms and Characteristics of Motor-Protective Circuit-Breakers
	Something about the motor
		Figure 1: Different categories of overload
	Standards and regulations
		IEC/EN 60204-1
		Terms and characteristics
			Table 1: Extract from IEC/EN 60 947-4-1
Modules and Functions of Motor-Protective Circuit-Breakers
	PKZM0 and PKZM4 motor-protective circuit-breaker series
	PKZ2 motor-protective circuit-breaker
		The switch mechanism
		The thermal release
			Figure 2: Bending of the bimetal
			a Initial position
			b Position before heating
			c Position after heating
	The magnetic trip block
		Figure 3: Magnetic overcurrent release
		a Current coil
		b Fixed contact element
		c Moving contact element
		d Contact pressure of switch mechanism
		e Striking armature
		f Electromagnetic release
Typical Applications
	The PKZ, a device for world markets
		Table 2: Switching duty of auxiliary contacts in AC control circuits
		1) The values 150, 300 and 600 are the maximum voltage for which an auxiliary contact can be used.
		2) Heavy Pilot Duty = High switching duty
		3) Standard Pilot Duty = Normal switching duty
			Table 3: Switching duty of auxiliary contacts in DC control circuits
		1) Heavy Pilot Duty = High switching duty
		2) Standard Pilot Duty = Normal switching duty
	Thermistor protection – additional protection for difficult cases
		Advantages of direct temperature monitoring
Motor Starters, More Than Just Motor Protection
	Fuseless motor starters
	Coordination types
	Table 4: Coordination types
		Networkable motor starters
				Figure 4: KLAS as an open system
				Figure 5: KLAS as an enclosed system

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