ABB Stabilized differential relay SPAD346

ABB's SPAD346 stable differential relay is a powerful and reliable power protection device. The following is a detailed introduction:

Functional features

Multiple protection functions integrated: integrated three-phase differential protection, three-phase overcurrent protection and multi-configuration ground fault protection functions, can provide comprehensive protection for two-winding power transformers, generator transformer units and generators, etc., and can quickly detect various fault types such as winding short circuit, turn-to-turn fault, ground fault and inter-pole short circuit.

Harmonic suppression function: With the second harmonic suppression function, it can effectively prevent the relay from malfunctioning due to the inrush current when the transformer is closed without load; at the same time, it has the fifth harmonic suppression function, which can prevent the malfunction of the transformer when it is overexcited.

Wide range CT ratio correction: supports a wide range of CT ratio correction, and can achieve accurate correction through digital settings, which can adapt to different current transformer configurations and improve system compatibility.

Abundant input and output interfaces: equipped with 4 heavy-duty output relays for circuit breaker tripping; 5 signal output relays, which can be used to issue various signal indications. In addition, there are 5 programmable external control inputs, which can connect the alarm and trip signals of external devices such as gas relays and oil temperature sensors.

Integrated fault recording function: The differential relay and ground fault relay modules integrate the fault recording function of analog and digital signals, which can record the relevant signals at the time of the fault, facilitating the subsequent analysis of the fault.

High anti-interference ability: It has high immunity to electrical and electromagnetic interference, can operate stably in harsh industrial environments, and ensure the reliable operation of the relay.

Technical parameters

Rated voltage: AC 690V (applicable voltage level, the withstand peak voltage is adjusted according to the system configuration).

Rated current: 630A (applicable to the secondary side rating of the matching current transformer).

Protection function: three-phase differential protection, three-phase overcurrent protection, two-stage backup ground fault protection.

Installation method: 35mm DIN rail installation or base fixed installation.

Protection level: IP20 (anti-electric shock protection, suitable for installation in the cabinet).

Certification standards: Comply with international and Chinese electrical safety standards such as IEC 60255 and GB/T 14598.

Application areas

Applicable to large-scale cement, petroleum, mining, steel, shipbuilding and other industries. It is mainly used for differential protection of double-winding or three-winding power transformers, generators and large motors, providing reliable protection for the stable operation of the power system.