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What the three types of over current protection relay and describe the principles of operation?
RichardBarbarona
over current protection relay
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∙ 10y ago
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What is an impedance relay?
Impedance relays are used whenever over-current relays do not provide adequate protection. They function even if the short circuit current is relatively low. The speed of operation is independent of current magnitude. Impedance relays monitor the impedance between the relay location and the fault. If the impedance falls within the relay setting, the relay will operate. The basic construction for impedance relays on which the principle of operation is easily explained is the balanced beam.
What term refers to holes and electrons in the operation of a transistor?
current carriers
What is the advantage of DOL starter?
for smooth operation and also to reduse starting current
How does a transformer protect an appliance?
Normally current transformers are used for two things . For measuring and protection. Whenever the CT is a protection CT it will be connected with the protection relays and there will be setting in the relays based on our requirement. when the current pass through the relays are more than the setting range then relay will send the tripping signal to the breaker available in the system to isolate the fault section. Finally the CT is not protecting the system. it will transfer the high primary current from the system to relay as small secondary current.
The term used to describe the frequency with which current changes its direction of flow in a second is the?
The term Hertz (abbreviated Hz.) is used to describe the frequency with which current changes its' direction of flow in a second. Such as, our system frequency is 60 Hz.
What is the purpose of the current regulatory system for the protection of human subjects?
implement the ethical principles underlying the conduct of human subjects research.
Web protection?
form_title=Web Protection form_header=We understand the importance of security. Protect your business with secure web protection you can trust. What are your priorities for web protection?= [] External attacks [] Denial of service [] Hacking [] Other What current web protection do you use?=_ Describe what internal protection you need, such as data and capacity backup? =""
What is over current protaction?
'Overcurrent protection' is a means of protecting a cable and its load from damage due to an overcurrent. An 'overcurrent' is defined as either an 'overload current' (due to an excessive load) or a 'short-circuit current'. In its simplest form, overcurrent protection is provided by means of a fuse, but it can also be provided by means of a circuit breaker. In the case of high-voltage systems, the circuit breaker is tripped by the operation of one or more overcurrent protection relays which monitor the circuit using current transformers.
What is The operation of Current Transformer?
CT together with a ammeter is used to measure the current in high current or high voltage circuit, where a normal ammeter can not be connected in series in such high voltage or high current circuits. It is a secondary winding (like in transformer) wound on a single core primary wire and relative secondary current reperesnets the primary current. CT are also used protection purposes. Basic principle of CT i same either for metring or protection.
What is the meaning ampere protection?
Amperes refer to the current in an electrical circuit. Ampere protection is rarely used but it refers to current protection. Typically this will relate to protection against over current events with fuses or circuit breakers.
Why bjt is called current controlled current device?
Because the operation of the transistor is determined by the current at the base. the principle equations of BJT operation are: Ic = h*Ib ,and Ie=Ib+Ic thus device operation is controlled by the input current.
What is the basic requirement of current data protection?
The basic requirement of current data protection is that privacy has to be upheld. It needs to comply with the provision of Data Protection Act of 1998.
What is Modular Operation Theatre Manufacturers?
Modular Operation theatre is a current idea of operation theatre anywhere all current technology presented to offer best possible surgical care to the patient
What is a bleeder current?
The current left after the total load current is subtracted from the total current into the circuit. -From Principles of Electric Circuits by Floyd
Do you choose a breaker for wire or equipment protection?
Overcurrent current protection is for the wires
What are current forces?
current force is describe as voltage
What is an impedance relay?
Impedance relays are used whenever over-current relays do not provide adequate protection. They function even if the short circuit current is relatively low. The speed of operation is independent of current magnitude. Impedance relays monitor the impedance between the relay location and the fault. If the impedance falls within the relay setting, the relay will operate. The basic construction for impedance relays on which the principle of operation is easily explained is the balanced beam.
