ABB REA 101 arc protection relay

ABB REA 101 arc protection relay

Product Overview

REA 101 is an arc protection relay (central unit) launched by ABB, which is the core component of REA 10_ arc protection system. It is mainly used in low-voltage or medium voltage air insulated metal enclosed switchgear, and can quickly send tripping commands to all circuit breakers that may supply power to arc faults, in order to minimize the damage caused by arc faults.

Brand background

REA 101 is produced by ABB company. ABB is a leading global enterprise in electrical and automation technology, with business covering multiple fields such as power, industry, transportation, and infrastructure. It has over 130 years of technological accumulation and innovative experience. Its products are renowned for their high quality, performance, and reliability, and have a wide influence in the field of industrial automation control. REA 101 is a reflection of its technical strength in the field of arc protection.

Specification parameters

Current input rated current 1A/5A; Continuous load current 4A/20A; Instantaneous current of 100A/500A per second; Dynamic withstand current (half wave value) 250A/1250A; Input impedance<100m Ω/<20m Ω; rated frequency 50/60Hz

Output HSO1 and HSO2: rated voltage of 250V DC/AC, continuous carrying of 1.5A, on-off of 30A in 0.5 seconds, on-off of 15A in 3 seconds, DC breaking capacity (when L/R<40ms) of 5A/3A/1A at 48V/110V/220V, respectively

TRIP3: Rated voltage 250V DC/AC, continuous load capacity 5A, on-off 30A in 0.5 seconds, on-off 15A in 3 seconds, DC breaking capacity (when L/R<40ms) 5A/3A at 48V/110V/220V respectively

IRF signal contact: rated voltage 250V DC/AC, continuous load 5A, on-off 10A in 0.5 seconds, on-off 8A in 3 seconds, DC breaking capacity (when L/R<40ms) 1A/0.25A/0.15A at 48V/110V/220V respectively

Control input (reset) rated voltage: 24/48/60/110/220/250V DC, 110/120/220/240V AC; Scope of work: 18-300V DC, 18-265V AC; Control current of 1.5-20mA; minimum pulse length of 1s

The optional action delay for circuit breaker failure protection is 100ms/150ms; The accuracy of HSO2 action time is ± 5% of the set value; TRIP3 is ± 5% of the set value+5-15ms

Rated voltage of power supply: 110/120/220/240V AC, 110/125/220/250V DC; REA101-CAA and REA101-CAAG are 24/48/60V DC

Voltage variation range: AC is 85-110% Ur, DC is 80-120% Ur

Power consumption is about 9W/12W in static/working state; The maximum output power of the port is about 19W; the maximum power consumption when connecting 10 expansion units is less than 50W

The maximum length of the sensor fiber is 60m when there is no connector or 1 connector; 50m when there are 2 connectors; 40m when there are 3 connectors; the working temperature range is -35-+80 ° C; the minimum bending radius is 50mm

The maximum total length of the connecting chain between the central unit and the expansion unit of the connecting cable is 40m

Optolink communication plastic fiber maximum length 40m; glass fiber maximum length 2000m

Set the current range with step sizes of 0.5, 1.0, 1.5, 2.5, 3.0, 5.0, and 6.0 times the rated current; Neutral line current setting step size 0.05, 0.10, 0.15, 0.25, 0.3, 0.5, 0.6 times rated current; Action accuracy is ± 5% of the set value or ± 2% of the rated current

Total action time HSO1 and HSO2<2.5ms; TRIP3<15ms

Environmental testing operating temperature range -10-+55 ° C; transportation and storage temperature range -40-+70 ° C; meets multiple environmental testing standards

The protection level of the shell is IP20; Weight approximately 4.6kg

Insulation test dielectric test 2kV, 50Hz, 1min; Impulse voltage test 5kV, 1.2/50 µ s, 0.5J; Insulation resistance>100M Ω (500V DC)

Electromagnetic compatibility meets multiple EMC testing standards, such as 1MHz pulse interference, electrostatic discharge, radio frequency electromagnetic field interference, etc

Core functions

Overcurrent detection: It can perform three-phase or two-phase neutral line overcurrent detection, with adjustable current threshold, and can quickly respond to fault currents.

Arc light detection: Detect arc light through fiber optic sensors or lens sensors, activate when the light signal exceeds the set reference level, and support automatic or manual backlight compensation.

Trip output: Equipped with two high-speed solid-state (IGBT) outputs (HSO1, HSO2) and one overload relay output (TRIP3), used for circuit breaker tripping. The tripping condition can be set to meet both the optical signal and overcurrent signal or only the optical signal.

Expansion unit connection: Connect expansion units (such as REA103, REA105, REA107) through ports A and B. Each port can cascade up to 5 expansion units to expand protection range and selectivity.

Optolink communication: Two Optolink communication links can transmit optical signals, overcurrent signals, trip signals, etc. between central units to achieve collaborative protection.

Circuit breaker failure protection: When the circuit breaker fails to successfully disconnect the fault current, a trip command is issued to the upstream circuit breaker after a set delay.

Self monitoring: Continuously monitor the sensor fiber optic circuit, operating voltage, wiring between the central unit and expansion unit, etc. When a fault occurs, activate the corresponding indicator light and reset the IRF relay.

Working principle

REA 101 monitors fault current through overcurrent detection unit, and detects the light signal generated by arc light through arc light detection unit. When both overcurrent signal and optical signal are received simultaneously (and there is no working voltage fault signal), the tripping output is triggered, causing the circuit breaker to operate and cut off the fault circuit. Through Optolink communication, information exchange between central units can be achieved, and combined with extension units, the protection range can be expanded and selective tripping can be achieved. The self-monitoring unit monitors the equipment status in real-time to ensure the reliable operation of the system.

Key advantages

Quick response: The total action time is short (HSO1 and HSO2<2.5ms, TRIP3<15ms), which can quickly cut off faults, reduce equipment damage and personnel injury risks.

High reliability: equipped with comprehensive self-monitoring function, timely detection and indication of faults; Adapt to complex industrial environments through multiple rigorous insulation and electromagnetic compatibility tests.

Strong flexibility: Supports multiple sensors (fiber optic sensors, lens sensors), can operate independently or work in conjunction with other central units and expansion units to adapt to different protection needs.

Easy to expand: By connecting expansion units through ports, the protection range can be flexibly expanded according to the system size, improving system selectivity.

Accurate protection: dual detection of overcurrent and arc light to avoid misoperation and ensure reliable operation in the event of actual arc light failure.

Precautions

Safe operation: comply with national and local electrical safety regulations, only qualified electricians are allowed to carry out electrical installations; The equipment framework needs to be reliably grounded; The sensor fiber should be handled carefully to avoid sharp bends (minimum bending radius 50mm), and should not be placed on the ground during installation to prevent stepping on it; When changing settings and configurations, the auxiliary power supply needs to be disconnected.

Installation settings: The sensor fiber end needs to be protected to avoid unnecessary triggering; When connecting expansion units, pay attention to the port switch settings, and the last expansion unit needs to be connected to a terminal resistor; Settings and configuration changes need to be made with the auxiliary power disconnected.

Maintenance testing: Regularly check the current measurement function, optical signal transmission, etc; Follow the prescribed steps when testing the arc protection system to ensure its normal operation.

Environmental requirements: Use within the specified range of temperature, humidity, and other environmental parameters to avoid extreme environmental conditions affecting equipment performance.

Similar model supplement

REA103: Expansion unit that can add an arc light sensor circuit to expand the protection area and assist REA101 in achieving more comprehensive arc light monitoring.

REA105: Expansion unit with trip output, capable of selective tripping. When the arc fault is located behind a specific circuit breaker, it accurately controls the corresponding circuit breaker action, enhancing system selectivity.

REA107: Expansion unit with 8 lens sensor inputs, suitable for arc light monitoring of specific compartments, improving monitoring specificity.

Application scenarios

Mainly used for arc protection of low or medium voltage air insulated metal enclosed switchgear, such as power distribution systems in substations and industrial plants. A circuit breaker compartment that can protect busbars, outgoing feeders, cable terminals, etc. By cooperating with expansion units, it achieves comprehensive, fast, and reliable arc fault protection for complex distribution systems, suitable for electrical safety protection in fields such as power and industry.