ST420H Series Microcomputer Line Protection Device

ST420H1-3
ST420H1-2
ST420H-3
ST420H-4
넳 넲
ST420B1 series microcomputer line protection device is a protection of the main body and display module integrated device, suitable for rated frequency 50/60Hz, rated voltage below 1kV feeder circuit applications. The device is composed of protection main body (including display), special current transformer, zero sequence current transformer and other parts. The protection main body of the device is installed on the cabinet panel, and the other parts are installed in the cabinet

technical parameters

Analog Input Loop

transformer rated current In

1A, 5A, 10A, 25A, 100A,

160A, 400A

Rated voltage Un

AC380V/400V

frequency F

50/60Hz

Rated leakage current I △n

1A, 5A, 30A

current circuit

2In continuous operation; 10In is allowed to operate for 10s

40In allows running for 1s

voltage circuit

1.2Uncontinuous operation;1.4UnAllow to run10s

power consumption

No current, voltage <1VA/phase

Measurement range and accuracy

Name

accuracy

current I

0.5~1.2 In

≤±0.5%In

voltage U

0.1~1.2 Un

≤±0.5%Un

Active power P Electrical degree EP

|Cos&phi;|≥0.707 U/Un=(50~120)% I /In=(50~120)%

≤ ± 1%

power factor COS

|Cos&phi;|≥0.707

≤ ± 1%

Leakage current I △

0.5~1.2 I△n

≤±1%I△n

current harmonics

Ih/In=(5~50)% I /In=(50~120)%

≤±1%In

voltage harmonics

Uh/Un=(5~50)% U/Un=(50~120)%

≤±1%Un

analog output

4 ~ 20mA

≤ ± 0.5%

protection action accuracy

Current/voltage fixed value

≤ ± 3% fixed value

Delay time T

T<4s

≤ ± 35ms

T≥4s

≤ ± 1% fixed value

return coefficient

Overprotection

<0.95% fixed value

underprotection

>1.05% fixed value

Product Details

ꄴThe previous one： ST420B1 series microcomputer line protection device
ꄲThe latter one： ST420B3 series microcomputer line protection device

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