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Digital motor protection relay

DSP-3SD, 3SD-RG Digital Protection Relay/3CT Based

Digital Protection Relay/3CT Based

Main Feature

Panel Mounting Type
Access restricted to authorized operator: password
MCU based digital control : optimized protection
Compact size,Practical simple applicationn
- Protection : Over current, Phase loss, Reverse phase,Locked rotor,Current unbalance,GF
- GF : available for DSP-3SS-RG Type
- Indication : 3 phase current
3 phase load protection through 3 CT
To cover a wide and precise current range for the protection
- 10 Type :
  - Definite T-I : 0.5A∼10A , 0.5A~6A with external CT
  - Inverse T-I : 0.5~6A/800% to "oc"
- 60 Type
  - Definite T-I: 5A ∼ 60A
  - Inverse T-I: 5A~15A/800% to “oc”
- Wide protection current range with external CT : 1A∼600A
Trip cause indication by number and/or characters : 4 digit window
Rotated indication for 3 phase current with 3 sec interval
- 1P(single phase) : L1-L3 current
- 3P(three phase) : L1-L2-L3
Convenient selection for 1P/3P in preset mo
Manual/Electrical/Auto Reset : easy selection in preset mode → flexible application to meet various system
Stable operation under frequency variation from Inverter : 30Hz ∼ 400Hz
Self-diagnostic test by one touch of "SET" key
History, latest 8 trip events including self-diagnostic function

Technical Specification

Current rating
- 10 Type : 0.5A∼10A / 0.5A~6A with external CT
- 60 Type : 5A ∼ 60A
- External CT : 1A ∼ 600A
Operation Time
- Starting trip delay time(dt) : 1 ~ 300sec /Definite T-I
- Over current trip delay time(ot) : 1~60sec/Definite T-I
  - definite T-I:1~60sec
  - Inverse :1~30Class
- Phase loss trip delay time(PLc) : 1~5sec
Allowable tollerance
- Current : C≤2A : 0.2A, C>2A : ±5%
- Time : t≤2sec : ±0.2sec, t>2sec : ±10%
- Control power : 24VDC (Optional Type)
Trip output
- Main : 95-96, 97-98 : 1a-1b(1-SPDT), 250VAC/3A, 30VDC/1A, Resistive
Application environment
- Operation : -25℃ ~ +70℃
- Storage : -40℃ ~ +80℃
- Relative humidity : 30∼85%, non-condensing
Stable operation under frequency variation from Inverter : 30Hz ∼ 400Hz ,avg ±5%
Screw Torque : Max 0.6N.m
Insulation Resistence / IEC-60255-5 : circuit-case, 10Mohm , 500VDC
High Voltage Withstand Test : IEC-60255-5
- circuit-case : AC2000V, 60Hz, 1min
- contact-contact : AC1000V, 60Hz, 1min
Lightning Impulse Voltage Withstand Test : IEC-60255-5
- Circuit-Ground, Circuit-Circuit : 1.2/50uS, 5KV
- Control Circuits : 1.2/50uS, 5KV
1MHz Burst Immunity Test / IEC 61000-4-18 : 2.5KV, Positive / Negative under 2sec
Electrostatic Discharge : IEC-61000-4-2
- Air : Level 3, 8KV
- Contact : Level 13, 6KV
Radiated Electromagnetic Field Disturbance / IEC-61000-4-3 : Level 3, 10V/m
Electric Fast Transient Burst : IEC-61000-4-4
- power,relay output : Level 4, 4KV
Surge Immunity test : IEC-61000-4-5
- relay output : 1.2×50uS, 2KV(0°, 90°, 180°, 270°)
Conducted Disturbence Test / IEC-61000-4-6 : 10V, Level 3
Power consumption : 2W Max