A customer is requesting for backup feed from another circuit to feed their facility in the event of a sustained outage. This entails installing an automatic open transition rollover switch tying two circuits together. If their primary service goes out, then the switch will automatically...
I hope I can get some assistance on this problem....
A customer with 3-ph open delta 120/240 V is having high voltage on the hi leg of 220 volts, which exceeded the +5% limit of 208V. The two primary side phases of the transformer are balanced. The primary voltage is fairly balanced at 123...
I was wondering if the cable/tv pedestal was bonded to a URD transformer, and if there was a line-to-ground fault at the URD transformer... then will the the cable/tv pedestal see the fault as well?
Thanks!
My supervisor is complaining that the utility's substation breaker operations fried the surge protector on our 480V line. Is that possible? If so, what are our options in mitigating it? Thanks.
I have a customer that's been complaining that their VFD's been tripping offline due to voltage spikes, and it was determined that the spikes or transients were from the switching online of a nearby capacitor bank. What are the different options the customer have to protect his VFD's from...
From a utility's standpoint, what are the advantages of having customers install a recloser vs a fuse as their main protective device?
We are required by the utility to install a recloser to protect our primary meter service and the added cost for installing a recloser as opposed to fuses is...
We have an RPM monitoring device installed at our substation and it is recording a positive and negative DC offset but only in the neutral current. What can this indicate?
We are trying to identify the source of the votlage sags on the circuit that may be caused by a customer that is...
What is considered the average or normal voltage drop from my meter to my breaker panel? I understand the ANSI standard range for service voltage at meter is 114-126V and 110V minimum at the receptacles, but what is % voltage drop should one expect at the main breaker panel? thanks!
Can someone please advise where in the NEC does it state that a customer's ground have to bond with the utility's? Our facility is receiving 12kV distribution voltage and was informed from our utility that we have to utilize their system neutral as a bond to our equipment ground.
A customer has a 3-ph 200hp motor rated 440V. The customer is fed from 3-167 kVA transformers at 277/480V. Full Load Amps of motor is 257A and he does not have info on Locked Rotor Amps or Letter Code. The customer claimed the 200 hp motor did not have enough torque to get past the initial...
A customer inquired about using Powersave 1200 to reduce his electric bills by 25%. Has anyone heard of this and know how accurate this device is? Apparently, it just requires plugging in to the breaker panel. Can someone please explain how this device operates and how it is able to reduce...
We have a monitoring device installed at a 3-ph, 480V 3-wire delta service to monitor our disturbances. When a fuse on b-ph blows, the voltage on b-phase drops to 320V and the voltage on C-ph drops to 250V, but A-phase remains at ~480V. I would think that if the fuse blows on a certain phase...
The utility company that I work for requires our customers to maintain a BIL of 120kV for 15kV service. The customer wants to install a pin insulator with a CFO rating of 105kV.
I noticed that the distribution insulators are rated according to their CFO value instead of BIL value. CFO is the...
Hi,
I need to do a signal comparison between two signals to see if there are any bit errors.
So, I'm sending two external signals as input to two different channels of the USB DAQ-6800 and compare it in Labview. Both signals are being transmitted at 9.6kHz, but one signal will have an...
Hi,
Can someone please assist me on how to generate a high frequency (at least up to 1MHz) white noise on hardware? Please direct me to a link where there is a schematic. Any help is appreciated!
Hi!
I have a signal generated in labview that I'm trying to send to an FPGA via NI-DAQmx USB-6008. I've been researching; however, all the examples seem to indicate that this device is for taking measurements. I don't need to take any measurements, just to have a vi to recognize the device...
Hi,
I'm trying to apply the fsk method to modulate an input square wave. I'm able to manipulate the signal into two different frequencies to represent the 1's and 0's, however, the output signal is not a continuous signal.
I think my problem is applying the 'if-else' logic, that's why I'm...
