ST420B3 series microcomputer line protection device

넳 넲
ST420B3 series microcomputer line protection device is a protection of the main body and display module split device, suitable for rated frequency 50/60Hz, rated voltage below 1kV feeder circuit applications. The device is composed of protection main body, display module, special current transformer, zero sequence current transformer and other parts. The display module of the device is installed on the cabinet panel, and the other parts are installed in the cabinet.

1)Device Overview

ST420B3series microcomputer line protection device is a protection of the main body and display module split device, suitable for rated frequency 50/60Hz, rated voltage below 1kV feeder circuit applications. The device is composed of protection main body, display module, special current transformer, zero sequence current transformer and other parts. The display module of the device is installed on the cabinet panel, and the other parts are installed in the cabinet.

2)Device Model

Note:

1) Standard 1 Modbus-RTU communication, display module with WiFi function;

2)AC660V/690V circuit application shall be specified when ordering;

3) See "2.3 Current Transformers" in this chapter for current transformers ".

3)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

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

40InAllow to run for 1s

voltage circuit

1.2UnContinuous operation; 1.4Un is allowed to operate for 10s

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 percentfixed value

underprotection

>1.05 percentfixed value

Auxiliary power supply

power supply voltage (both AC and DC)

AC 85~264V,DC 90~300V

power consumption (normal/protected)

≤ 3W / 5W

surge current

≤ 20A

working power supply

2S

switch input (standard 8)

Isolation Method

optical isolation

Power supply mode

Built-in DC24V

response time

≤ 50ms

relay output (standard 4 way)

R1, R2, R3

AC250V 7A,DC30V 7A

R6

AC250V 5A,DC30V 5A

analog (4 ~ 20mA) transmission output

transmission parameters

three-phase current, three-phase voltage,

leakage current, active power

Load resistance

≤ 750Ω

communication function

Modbus-RTUStatute

1channel, RS485 interface, terminal access

work environment

working temperature

-25~ +55 ℃

storage temperature

-25~ +70 ℃

relative humidity

5~ 95% (no condensation or ice inside)

altitude

<3000m

IPlevel

≥ IP20 (Panel ≥ IP40)

4)Contour Installation

Device Body

dimensions: 76.7mm × 112.3mm × 57.8mm (length and widthhigh).

Display Module ST523C

are: 103.0mm × 64.5mm × 45.9mm (length, width and depth), and the opening dimensions of the panel are: 91.5mm × 54.5mm (length, width).

Installation Method

device is the standard 35mm guide rail installation in the cabinet.

device is to install the buckle to fix the opening of the panel, install the four buckles along the grooves at the four corners of the device, and push them forward tightly, so that the front end is squeezed on the cabinet body, so that the device is installed.

5)Terminal Arrangement

6)Terminal Definition

7)Typical Wiring

Product Details

ꄴThe previous one： ST420H Series Microcomputer Line Protection Device
ꄲThe latter one： ST400 Series Electric Power Measurement and Control Instrument

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