polyfuse
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Polyfuses provide overcurrent protection and are self-resetting unlike conventional fuses. They are made from a composite of semi-crystalline polymer and conductive particles. When overcurrent occurs, the device heats up and the polymer expands, separating the conductive particles and sharply increasing resistance to reduce current flow. When the overcurrent ends, it cools and resets to low resistance. Polyfuses offer advantages over conventional fuses like automatic reset, compact size, and longer lifetime. They can protect various electrical equipment and components.
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Polyfuse
Polyfuse is a polymeric positive temperature coefficient thermistor (PPTC) that provides overcurrent protection and automatic restoration in a circuit. It is made from a composite of semi-crystalline polymer and conductive particles formed into thin sheets with electrodes. In normal operation, the polyfuse has low resistance, but it rapidly increases in resistance and trips in response to excessive current to reduce power in the circuit. This trip occurs as current flow causes heating and a change in crystalline structure that separates the conductive particles. Polyfuses have applications in transformer, speaker, battery, and equipment protection.
Polyfuse
Polyfuses is a new standard for circuit protection .It is re-settable by itself. Many manufactures also call it as Polyswitch or Multifuse. Polyfuses are not fuses but Polymeric Positive temperature Coefficient Thermistors (PPTC).We can use several circuit protection schemes in power supplies to provide protection against fault condition and the resultant over current and over temperature damage.
Polyfuse
Polyfuses are resettable fuses made of a conductive polymer mixed with carbon. They act as a thermistor, where the resistance increases with temperature. During an overcurrent event, the temperature rise causes the polymer to change structure from crystalline to amorphous, increasing resistance and stopping current flow. Once it cools, the polymer returns to its original crystalline state and conductivity is restored, resetting the fuse. Polyfuses provide overcurrent protection and automatic restoration, coming in various packages for different applications such as equipment, speakers, and batteries.
Polyfuse.
This document discusses polyfuses, which are resettable fuses made of PPTC material. Polyfuses provide overcurrent protection and automatically reset after fault conditions. They operate by rapidly increasing resistance when temperatures rise due to excessive current, which decreases current flow. This protects circuits from damage. Polyfuses come in various forms and ratings and offer advantages over conventional fuses like longer life, compact size, and no need for replacement after tripping. They are widely used to protect electronics, appliances, power supplies and more.
POWER SYSTEM PROTECTION
This document discusses power system protection settings and provides information on calculating protection settings. It covers the functions of protective relays and equipment protection, the required information for setting calculations such as line parameters and fault studies, and the process of calculating, checking, and implementing protection settings. The goal is to set protections to operate dependably, securely, and selectively during faults while meeting clearance time requirements.
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-Polyfuse
Poly fuses are polymeric positive temperature coefficient devices that act as self-resetting circuit protection elements. They function as a series element in a circuit that protects against overcurrent by transitioning from a low resistance state to a high resistance state when the trip current is exceeded, reducing current flow. This transition occurs as the polymer heating causes its structure to change from crystalline to amorphous, separating carbon particles and breaking conductive pathways. Once power is removed and it cools, the poly fuse will automatically reset to its original low resistance state.
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Recommended
Polyfuse
Polyfuse is a polymeric positive temperature coefficient thermistor (PPTC) that provides overcurrent protection and automatic restoration in a circuit. It is made from a composite of semi-crystalline polymer and conductive particles formed into thin sheets with electrodes. In normal operation, the polyfuse has low resistance, but it rapidly increases in resistance and trips in response to excessive current to reduce power in the circuit. This trip occurs as current flow causes heating and a change in crystalline structure that separates the conductive particles. Polyfuses have applications in transformer, speaker, battery, and equipment protection.
Polyfuse
Polyfuses is a new standard for circuit protection .It is re-settable by itself. Many manufactures also call it as Polyswitch or Multifuse. Polyfuses are not fuses but Polymeric Positive temperature Coefficient Thermistors (PPTC).We can use several circuit protection schemes in power supplies to provide protection against fault condition and the resultant over current and over temperature damage.
Polyfuse
Polyfuses are resettable fuses made of a conductive polymer mixed with carbon. They act as a thermistor, where the resistance increases with temperature. During an overcurrent event, the temperature rise causes the polymer to change structure from crystalline to amorphous, increasing resistance and stopping current flow. Once it cools, the polymer returns to its original crystalline state and conductivity is restored, resetting the fuse. Polyfuses provide overcurrent protection and automatic restoration, coming in various packages for different applications such as equipment, speakers, and batteries.
Polyfuse.
This document discusses polyfuses, which are resettable fuses made of PPTC material. Polyfuses provide overcurrent protection and automatically reset after fault conditions. They operate by rapidly increasing resistance when temperatures rise due to excessive current, which decreases current flow. This protects circuits from damage. Polyfuses come in various forms and ratings and offer advantages over conventional fuses like longer life, compact size, and no need for replacement after tripping. They are widely used to protect electronics, appliances, power supplies and more.
POWER SYSTEM PROTECTION
This document discusses power system protection settings and provides information on calculating protection settings. It covers the functions of protective relays and equipment protection, the required information for setting calculations such as line parameters and fault studies, and the process of calculating, checking, and implementing protection settings. The goal is to set protections to operate dependably, securely, and selectively during faults while meeting clearance time requirements.
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The document describes the Solio Bolt, a portable solar battery charger. It addresses challenges with previous solar chargers such as large size, inability to store charge, and unsafe charging. The Solio Bolt is a miniature solar panel combined with a smart battery that can charge devices safely and efficiently. It has features like a replaceable lithium-ion battery, multiple charging modes, and high solar panel efficiency. The Solio Bolt can charge phones, tablets, cameras and other devices and aims to make solar charging more portable and convenient.
-Polyfuse
Poly fuses are polymeric positive temperature coefficient devices that act as self-resetting circuit protection elements. They function as a series element in a circuit that protects against overcurrent by transitioning from a low resistance state to a high resistance state when the trip current is exceeded, reducing current flow. This transition occurs as the polymer heating causes its structure to change from crystalline to amorphous, separating carbon particles and breaking conductive pathways. Once power is removed and it cools, the poly fuse will automatically reset to its original low resistance state.
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Polyfuse
Polyfuses, also known as resettable fuses or multi-fuses, provide over-current protection for circuits and automatically reset after tripping due to overloads. They are made from PPTC material that changes from low to high resistance when overheated to trip the circuit. Polyfuses have advantages over conventional fuses like automatic resetting without replacement and protecting circuits from over-currents and overvoltages. They are used in applications like transformer protection, motor protection, computer protection, automotive electronics protection and more.
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Here are the steps to solve this problem:
1. Given:
Conductor diameter (d) = 10.4 mm
Spacing between conductors (s) = 2.5 m
Air temperature (T) = 21°C = 294 K
Air pressure (P) = 73.6 cm of Hg = 9.6 kPa
Irregularity factor (K) = 0.85
Surface factor for local corona (K1) = 0.7
Surface factor for general corona (K2) = 0.8
2. Critical disruptive voltage (Vc) = 28√(sdP/K)
= 28√(10.4×10-3×2.5×
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Here are the steps to solve this problem:
1. Given:
Conductor diameter (d) = 10.4 mm
Spacing between conductors (s) = 2.5 m
Air temperature (T) = 21°C = 294 K
Air pressure (P) = 73.6 cm of Hg = 9.6 kPa
Irregularity factor (K) = 0.85
Surface factor for local corona (K1) = 0.7
Surface factor for general corona (K2) = 0.8
2. Critical disruptive voltage (Vc) = 28√(sdP/K)
= 28√(10.4×10-3×2.5×
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This gives idea about necessity of protection of transmission line and protection based on time grading as well as on current grading. Also includes three step distance protection of transmission line
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complete description of devices used in power system protection
such as circuit breakers, relays , ct, pt, dc supply system and other devices
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The document is a report submitted by Ashutosh Srivastava detailing his 6-week summer training at the 220/132 kV substation in Barahuwa, Gorakhpur, Uttar Pradesh, India. It includes sections on the equipment found at a typical 220kV substation such as busbars, isolators, circuit breakers, transformers, and instrument transformers. It also discusses the selection of suitable substation sites and provides an overview of Uttar Pradesh Power Corporation Limited, the organization responsible for electricity transmission and distribution in Uttar Pradesh.
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**Lightning Arrester Presentation**
This document summarizes types of lightning arresters, their classification, identification, standard ratings, and service conditions. There are three main types of arresters: expulsion, valve, and gapless metal-oxide. Arresters are classified into four classes based on their nominal discharge current and use: station, intermediate, distribution, and secondary. Arresters must be properly identified and can operate under normal conditions of temperature, radiation, altitude, and frequency, but may require special consideration under abnormal conditions.
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Download the ppt file from the following link::
https://adf.ly/rdCCQ
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polyfuse
- 1. SEMINARON POLYFUSE SUBMITTED TO: Mr. KULDEEP BHARDWAJ Mr. DINESH TIWARI SUBMITTED BY: SACHIN SINGH 1304620015 EE 3rd YEAR
- 2. CONTENT Introduction Construction Principle of Operation Types of Polyfuses Advantage Over Conventional Fuses Applications of Polyfuse Conclusion
- 3. INTRODUCTION Basically a Thermistor Polymeric Positive Temperature Coefficient (PPTC) A new standard for circuit protection Self Resettable A series element in a circuit
- 4. CONSTRUCTION Polyfuse circuit protection devices are made from a composite of semi-crystalline polymer and conductive particles. At normal temperature, the conductive particles form low-resistance networks in the polymer. While cool, the polymer is in a crystalline state, with the carbon forced into the regions between crystals, forming many conductive chains.
- 5. The increase in volume during melting of the crystalline phase separates the conductive particles resulting in a large non-linear increase in the resistance of the device.
- 6. PRINCIPLE OF OPERATION As the device heats, the polymer will expand, changing from a crystalline into an amorphous state. The expansion separates the carbon particles and breaks the conductive pathways, causing the resistance of the device to increase.
- 7. This will cause the device to heat faster and expand more, further raising the resistance. This increase in resistance substantially reduces the current in the circuit.
- 8. When power is removed, the heating due to the holding current will stop and the PPTC device will cool. As the device cools, it regains its original crystalline structure and returns to a low resistance state where it can hold the current as specified for the device.
- 10. Typical Resistance Recoveryafter a Trip Event Figure shows typical behavior of a PolySwitch device that is tripped and then allowed to cool. This figure illustrates how, even after a no. of hours, the device resistance is still greater than the initial resistance. Over an extended period of time, device resistance will continue to fall and will eventually approach initial resistance.
- 11. OPERATING PARAMETERS Initial Resistance Operating Voltage Holding Current Trip Current Time to Trip Tripped State Leakage Current Power Dissipation
- 12. HOLDAND TRIP CURRENT AS A FUNCTION OF TEMPERATURE
- 13. TYPES OF POLYFUSES Surface Mount Resettable Fuses Radial-Leaded Resettable Fuses Battery Strap Resettable Fuses
- 14. ADVANTAGE OVER CONVENTIONAL FUSE Over current protection. Low base resistance. Automatic resettability. Short time to trip. No arching during faulty situations. Small dimensions and compact designs. Withstand mechanical shocks and vibrations. Life time- up to 10 times longer.
- 15. APPLICATION OF POLYFUSE Speaker Protection Battery Protection Transformer protection Protection of Electrical Equipments Protection of Computer Peripherals Automobiles, Industrial Control
- 16. CONCLUSION Self Resettable Device Compact Low Resistance Fast Trip Time Ideal for low cost over current protection Ideal for Low Voltage A.C & D.C
- 17. thank you