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Why you switch off circuit breakers before operate disconnecting switch at substation?
Wiki User
∙ 12y ago
It probably doesn't matter. But a "disconnecting means", as the NEC calls it, is not intended to be operated while under load, which is when the equipment is running. It is intended to isolate the equipment so it can be serviced safely. A breaker by its very nature is intended to be operated under load.
The larger the equipment, the more this matters.
Wiki User
∙ 12y ago
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What is inter cricuit in substation?
A: There practically no massive electronics circuit on a substation. The computing and controls are usually located miles and miles away. What is there however there is a modem or a link to the main computer where an operator can monitor and act according to what is required from time to time, Operate switchgear and so forth. A substation is 90% of the time void of humans
What is the highest voltage rated breaker an electrician can operate?
An electrician does not operate breakers he installs them.
What are the advantages and disadvantages of oil compared to air when considering methods of arc control in circuit breakers?
Air has less quenching effects when a breaker breaks on load or on a fault. Air circuit breakers are not suggested for very high rating current and high voltage application. It is ok for Low voltage application. Oil is cumbersome to use and maintain. But Hv or EHV application oil is used for breaker quenching application. These days SF6 or vacuum circuit breakers are more popular for HV, EHV application.
How do you repair main circuit breaker on ships?
Repairing circuit breakers is not advisable. When a breaker is taken apart there are many parts that have to specifically align up with each other. Any misalignment and the breaker may not operate correctly if subjected to a fault condition. Do like the landlubbers do and replace the faulty breaker with a new one. This makes everyone safe.
What jobs dose a battery do in the circuit?
The purpose of the battery in a circuit is to wive energy to the circuit
How did early circuit breakers operate?
Circuit breakers operate. is the operetion of the break of the circuit. FORMULA : f(x) = m x+b
Do you have a circuit breaker which operates for one millon volts?
Circuit breakers operate on current not voltage.
What is the function of battery bank in a substation?
a very helpful functionAnswerBatteries are essential components in a substation. They provide the (tripping) current by which protective relays can trip high-voltage circuit breakers in the event of a fault. This means that the circuit breakers can trip even if the substation itself has lost its ancillary AC power supply.
How do fuses and circuits breekers help to protect us?
Fuses and Circuit Breakers act as a control mechanism to the flow of current in electrical circuits. A fault can develop in an electrical appliance without us noticing and this is where circuit breakers and fuses help in automatically disconnecting the faulty appliance from the power source. Most electrical faults resulting excess heat generation which in turn cause fires. Electrical shock can also be prevented by special types f circuit breakers called Earth Leakage Circuit breakers (ELCB). These breakers operate whenever there is an earth leakage protecting humans.
What circuit breakers can you use in your load center and why?
Usually the load center and the breaker have to be of the same manufacturer to operate correctly.
What is inter cricuit in substation?
A: There practically no massive electronics circuit on a substation. The computing and controls are usually located miles and miles away. What is there however there is a modem or a link to the main computer where an operator can monitor and act according to what is required from time to time, Operate switchgear and so forth. A substation is 90% of the time void of humans
Do gcfi breakers operate with only hot and neutral ?
yes. A GFCI monitors the amount of current flowing from hot to neutral. If there is any imbalance, it trips the circuit.
How does magnetic contactor operate?
explain me about the contactor works with examples. if i want to control a motor with contactor. and how i can use contactor in loops with over load and circuit breakers.
Components used to build the substation?
Substation main components include the following:1. The power transformer which is the heart of the Substation. It is the Power transformer that steps up (in the case of a step up Substation for transmission) or steps down (in the case of step down Substation for distribution) the voltage e.g. 132/33kV (step down), 33/132kV (step up).2. The Auxiliary transformer (which is fed from the output of the Power Transformer). This transformer powers the substation accessories and auxiliary equipments such as controls, lighting, Substation control room etc)3. Disconnecting switch or Isolators4. Earthing switch for grounding the main line in case there is need for maintenance work5. Control relays and Protective relays for short circuit, over voltages etc6. Instrument transformers e.g. voltage transformers, current transformers that will take current from the main high voltage line in case of an over current on the line and produce a current that the protective relays can operate with.7. Supervisory Control and Data Acquisition (SCADA) systems for line monitoring and control8. DC power supply system in the form of batteries for supplying DC loads such as emergency lightings, relays, rectifiers, chargers etc.9. Lightning arrestors10. Surge arrestors11. Switchgears for the high and low voltage levels, AC/DC panels12. Circuit breakers for the high and low voltage levels
What is the highest voltage rated breaker an electrician can operate?
An electrician does not operate breakers he installs them.
What total current delivered to a number of devices connected in parallel is the sum of the individual currents in each device Circuit breakers are resettable automatic switches that protect against a?
Yes, the total current delivered to multiple devices in parallel is the sum of the individual branch currents (the vector sum if there is inductive load). Circuit breakers are resettable automatic switches that help protect against circuit overload (such as running too many hair driers and heaters on at one time) and faults (such as dropping the hair drier into a bathtub). Circuit breakers "operate" (or open) to stop current flow to the fault or overloaded circuit.
What are the advantages and disadvantages of oil compared to air when considering methods of arc control in circuit breakers?
Air has less quenching effects when a breaker breaks on load or on a fault. Air circuit breakers are not suggested for very high rating current and high voltage application. It is ok for Low voltage application. Oil is cumbersome to use and maintain. But Hv or EHV application oil is used for breaker quenching application. These days SF6 or vacuum circuit breakers are more popular for HV, EHV application.
