result |
description |
P |
TPY |
M |
PR |
PX |
TPS |
TPX |
TPZ |
Load |
Actual load |
unit:VA,CT secondary measure actual load |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Power factor |
Power factor of actual load |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
impedance |
unit:Ω,CT secondary measure secondary impedance |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Resistance |
resistance(25ºC) |
unit:Ω,CT secondary measure secondary resistance |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
resistance(75ºC) |
unit:Ω,Convert to resistance under 75ºC |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
excitation |
knee voltage and knee current |
unit:V and A,According to standard definition,when knee voltage increase 10%,knee current increase 50%. |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Unsaturated inductance Lu |
unit:H,The average inductance of linear section for excitation curve |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
remanence coefficient Kr |
ratio of magnetism and magnetic |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Second time constant Ts |
unit:s,the time constant of CT's second connect rated burden |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
limiting e.m.f Eal |
unit:V,calculation limit e.m.f. according to the CT nameplate and resistance under 75ºC |
√ |
√ |
√ |
√ |
|
|
√ |
√ |
composite error |
limiting e.m.f or the composite error of rated knee potential |
√ |
|
√ |
√ |
√ |
|
|
|
Peak transient error |
Peak transient error of limiting e.m.f |
|
√ |
|
|
|
|
√ |
√ |
ALF |
actual ALF |
√ |
|
|
√ |
|
|
|
|
Instrument security coefficient |
actual instrument security coefficient |
|
|
√ |
|
|
|
|
|
Symmetrical short-circuit current multiples Kssc |
actual symmetrical short-circuit current multiples |
|
√ |
|
|
|
√ |
√ |
√ |
transient dimensioning factor |
actual transient dimensioning factor |
|
√ |
|
|
|
|
√ |
√ |
calcuated coefficient Kx |
actual calcuated coefficient |
|
|
|
|
√ |
|
|
|
Rated knee potential Ek |
|
|
|
|
|
√ |
|
|
|
Ie corresponding with Ek |
The actual excitation current corresponding with rated knee potential |
|
|
|
|
√ |
|
|
|
Rated voltage Ual |
The rated equivalent second limit voltage |
|
|
|
|
|
√ |
|
|
Ial corresponding with Ual |
The actual excitation current corresponding with the rated equivalent second limit voltage |
|
|
|
|
|
√ |
|
|
Ratio |
Ratio |
Actual current ratio under rated burden |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Turns ratio |
The ratio of actual secondary winding and primary winding |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Ratio difference |
The current errors under rated load |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Phase difference |
The D-value of phase under rated load |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Polarity |
There're two polarity relationship for primary CT and secondary CT: Positive and Negative |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
Turn ratio error |
The relative error between measured trun ratio and rated turn ratio |
|
|
|
|
√ |
√ |
|
|