ABB SPAJ 140 C overcurrent and ground fault relay

ABB SPAJ 140 C overcurrent and ground fault relay

Product Overview

Positioning: SPAJ 140 C is a combination overcurrent and ground fault relay used for selective short-circuit and ground fault protection of radial feeders in solid grounding, resistance grounding, or impedance grounding power systems. It can also be used in other application scenarios that require single-phase, two-phase, or three-phase overcurrent protection and non directional ground fault protection.

Core function: Integrated phase overcurrent unit and ground fault unit, with circuit breaker fault protection function, providing multiple output relay configurations and powerful data communication capabilities.

Core functions

Protection function:

Phase overcurrent protection: includes low setting stage I>(timed or inverse time characteristic) and high setting stage I>>(instantaneous or timed function).

Ground fault protection: Low setting stage I0>(timed or inverse time characteristic) and high setting stage I0>>(timed function).

Other protections: transformer surge detection, thermal overload protection, phase to phase circuit breaker protection, negative sequence overcurrent protection, circuit breaker fault protection.

Control and signal functions:

External control inputs can be used to block protection stages, reset latch output relays, or remotely control relay settings.

Provide two heavy-duty and four light-duty output relays, which can be configured through switch group functionality.

Measurement and recording:

Continuously measure phase current and neutral current, and display the highest load phase current and ground current by default.

The event log stores 100 timestamp events and records the simulated values of the last five trip events.

Self supervision and testing:

Built in self-monitoring system, monitoring hardware and software status, triggering alarms and blocking protection functions when faults are detected.

Support built-in testing mode to test HMI and binary output.

Technical characteristics

Hardware parameters:

The rated current is 1A or 5A, and the thermal withstand capacity is continuous 4A/20A and 100A/500A per second, respectively.

Power supply voltage range: SPTU 240 R1 is 80-265V DC/AC, SPTU 48 R1 is 18-80V DC, with a power consumption of approximately 4-6W.

Protection features:

The low setting stage of overcurrent and ground fault protection can select time limit (DT) and inverse time limit (IDMT) characteristics, supporting multiple standards and special curves.

The circuit breaker fault protection generates a trip signal after a set time (0.1-1 seconds) following the main trip signal.

Communication and Interface:

Built in serial port, supporting MODBUS RTU or IEC 60870-5-103 protocol, connected via fiber optic SPA bus.

Four binary inputs and six output contacts, the output contacts can be configured for different functions.

Application scenarios

Suitable for short-circuit, overcurrent, and grounding fault protection of incoming and outgoing feeders, overhead lines, and cable feeders in medium voltage distribution stations, as well as main protection of distribution transformers.

Different application configurations (B/C/D) provide different combinations of functions to meet different protection requirements.

Operation and Settings

Human computer interaction: The local HMI includes an alphanumeric LCD display screen, LED indicator lights, and navigation keys, supporting multiple languages.

Setting method: Use a portable PC and software to set parameters through the front panel buttons or serial port, supporting switching between two sets of parameters: main settings and second settings.

Switch group configuration: Configure relay functions and output signal routing through software switch groups SGF, SGB, and SGR.

Technical parameters

Size and Installation: Adopting a crimping panel installation, the size is about 130 × 160 × 151.5mm, the weight is about 3.5kg, the protection level is IP54 for the front panel, and IP20 for the back terminal.

Environmental conditions: working temperature -10 ℃~+55 ℃, storage temperature -40 ℃~+70 ℃, relative humidity<95% (no condensation), altitude up to 2000 meters.

Electromagnetic compatibility: Complies with standards such as IEC 60255 and has passed tests such as high-frequency pulses, electrostatic discharge, and rapid transients.