Swasco
Member
- Location
- Sioux City, Iowa USA
Can two ammeters be wired to one ct?
CT's and ammeters
- Thread starter Swasco
- Start date
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- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
For what purpose?
If the voltage drop of each ammeter is low enough you could wire them is series so that they both gave an identical and correct reading.
If you try to put the meters in parallel the sum of the two readings could be the CT current, but the current split between the two would not be controllable.
Tapatalk!
If the voltage drop of each ammeter is low enough you could wire them is series so that they both gave an identical and correct reading.
If you try to put the meters in parallel the sum of the two readings could be the CT current, but the current split between the two would not be controllable.
Tapatalk!
SG-1
Senior Member
- Location
- Ware Shoals, South Carolina
It is quite common in MV Switchgear to wire multiple devices in series in a current circuit. The circuit designer just needs to watch that the burden does not exceed the limit for the CT being used.
Swasco
Member
- Location
- Sioux City, Iowa USA
Will there be an issue with wire length?
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
I'm guessing only similar issues as a single meter with same length of wire.
SG-1
Senior Member
- Location
- Ware Shoals, South Carolina
Phil Corso
Senior Member
- Location
- Boca Raton, Fl, USA
Swaso...
"Burden" is the total equivalent impedance of the electrical protective and measuring devices connected to the transformer(s) secondary. Connecting lead lengths are also included. Device impedances are usually furnished by the device manufacturer.
Typically, one selects a transformer having a capacity that equals or exceeds the computed burden. Burden could be expressed in Volt-Amperes @ some load angle, or resistance and reactance. All xfmr designs are required to meet specific 'Accuracy' standards. Of course there are a myriad of standards depending on the country of origin.
Regards, Phil Corso
"Burden" is the total equivalent impedance of the electrical protective and measuring devices connected to the transformer(s) secondary. Connecting lead lengths are also included. Device impedances are usually furnished by the device manufacturer.
Typically, one selects a transformer having a capacity that equals or exceeds the computed burden. Burden could be expressed in Volt-Amperes @ some load angle, or resistance and reactance. All xfmr designs are required to meet specific 'Accuracy' standards. Of course there are a myriad of standards depending on the country of origin.
Regards, Phil Corso
Phil Corso
Senior Member
- Location
- Boca Raton, Fl, USA
Swasco...
"Burden" is the equivalent impedance of the electrical protective and measuring devices connected to the transformer(s) secondary. The connecting leads, hence length, are also included. Device impedances are furnished by the device manufacturer.
Typically, one selects a transformer having a capacity that equals or exceeds the computed burden. Burden could be expressed in Volt-Amperes @ some load angle, or resistance and reactance. All xfmr designs are required to meet specific 'Accuracy' standards. Of course there are a myriad of standards depending on the country of origin.
Regards, Phil Corso
"Burden" is the equivalent impedance of the electrical protective and measuring devices connected to the transformer(s) secondary. The connecting leads, hence length, are also included. Device impedances are furnished by the device manufacturer.
Typically, one selects a transformer having a capacity that equals or exceeds the computed burden. Burden could be expressed in Volt-Amperes @ some load angle, or resistance and reactance. All xfmr designs are required to meet specific 'Accuracy' standards. Of course there are a myriad of standards depending on the country of origin.
Regards, Phil Corso
Very common in high voltage substation relaying as well .
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