0
What can happen if the gas pressure in SF6 CB is dropped below the specified level?
Wiki User
∙ 12y ago
SF6 is used to increase the dielectric strength of the gap in the circuit breaker. If the gas pressure is too low, the dielectric strength will be inadequate to break the voltage applied across the breaker contacts. This means electricity will continue to arc across the contacts when opened, causing the breaker to heat up and likely fail catastrophically (explode).
Most gas breakers have low gas alarms and trip contacts. If there is no way to bypass the breaker, a low gas trip contact can be used to open the breaker before the gas pressure gets too low to allow openning.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
What type of filter attenuates all frequencies above and below a specified passband?
Band-Pass filters
What is difference between 500MW boiler 660MW boiler?
500 MW Boiler is sub-critical Boiler which generates steam at pressure lower than the critical pressure ie below 221.2 kg/sqcm. where as the 660 MW boiler is super critical boiler which operates steam pressure above critical pressure.
What would happen if the lead of your voltmeter were connected backward?
A digital voltmeter will read negative voltage, if connecting backward. If the meter is an analogue type, the needle will go backwards and dip below the 0 on the scale.
What does the circuit symbol below represent?
Switch
Knee pont voltage- briefly distinguish?
The knee point voltage of a CT is the voltage at the "knee" of a I-V characteristic (if you increase voltage, and plot this voltage with respect to the current flow, you will see a logorithmic type response). The knee is usually specified as 10% distortion (ie, the voltage is 10% less than you would expect relative to the current flow). beyond the knee point, the CT is considered in saturation. This applies to amplifiers / transistors as well as CTs. Transistors used as ampifiers are operated in the "linear region", or the region below the knee point of that particular transistors I-V characteristic.
What would happen if there was less pressure on the earths inner core?
The melting temperature would drop. If it dropped to a point below the in-situ temperature, melting of the inner core would occur.
What would happen if the temperature dropped below -273.15 degrees Celsius?
It is absolute zero and all molecular motion stops
2005 Toyota rav4 Why does the tire pressure light keep coming on?
I have a 2008 Toyota RAV4. When the weather dropped below zero the tire pressure light came on. Checking the PSI indicated less than a 2 PSI change ( dropped from 32 to 30). With the tire pressure properly inflated the light did not go off. I discovered that the spare has a transmitter as well and was well below pressure. Properly inflating the spare corrected the issue of the tire pressure light.
What would happen if the temperature dropped below -273.15 degrees in theory?
It is absolute zero and all molecualr motion would completely cease.
What might happen to a liquid with a freezing point of 32 degrees if its temperature dropped below 30 degrees?
At 30 0F this liquid become a solid (this is water).
What happens when blood pressure drops?
If the arterial pressure drops slightly below normal, that means the blood pressure has dropped. A slight decrease may not show any side effects, or it may cause dizziness.
Do you fill a tire to the maximum stated on the tire or a little below that?
Fill the tire to the level specified on the sticker on the drivers door jamb, or in the owners manual. That is the pressure that the vehicle manufacturer requires.
What happen if nerve cells sense that the core body temperature has dropped below 37?
the hypothalamus produces chemicals that signal cells throughout the body to speed up their activities
Does shocked and dropped rhyme?
No. Please see the related questions below for "What rhymes with shocked?" and "What rhymes with dropped?"
When does a volcano happen?
A volcano happens whenever the pressure of the melted rocks below the earth becomes great enough to break through the surface.
Why boiler is in vaccumed condition?
Because you forgot to open the vent when the pressure dropped below 15 psig. A boiler under vacuum will suck in its handholes and manholes, and they might start leaking when pressure is put back on them. weakened boiler parts can fail as well.
When intrapulmonary pressure drops below atmospheric pressure what is able to occur?
Inspiration occurs when the intrapulmonary pressure decreases to below atmospheric pressure
