SPAD346C3 ABB 差动继电器 提供可靠高效的保护

SPAD346C3 ABB 差动继电器 提供可靠高效的保护

特征

高精度和灵敏度

快速响应时间

广泛的可调节设置

多种通信选项

易于安装和配置

SPAD346C3是ABB制造的差动继电器。它旨在通过检测和响应异常电气条件，为电气设备提供可靠的保护。凭借其先进的功能和可调节的设置，它提供了精 确高效的差动保护。

频率控制电机及其电力变压器的保护。SPAD346C3只能用于为变频器供电的电力变压器的保护，在SPAD346C3差动保护继电器中，基频分量用傅立叶滤波器进行数字滤波。该滤波器将抑制除设定基频以外的频率，因此继电器不适合测量变频器的输出，即继电器不适合保护由变频器供电的电力变压器或电机。

短架空线路或电缆线路的保护SPAD346C3可用于架空线路或电缆线的差动保护。如果测量点之间的距离相对较长，则可能需要插入CT来减轻CT的负担。CT和保护继电器之间的距离越长，CT负担就越高（由于连接线的电阻）。此外，CT的实际精度限制因子可能太低，无法满足差动保护的要求。通常使用1A的二次电流而不是5A就足够了。例如，如果二次导线的总电阻为1.0欧姆，并且使用5A的额定二次电流，CT负载将为（5A）2×1.0Ω=25 VA。与其为了补偿增加的负担而过度调整CTVA评级，不如提高CT比率。如果使用1A额定二次电流，则负载仅为（1A）2×1.0Ω=1 VA.3.6.1。

SPAD346C3 ABB 差动继电器 提供可靠高效的保护

trait

High accuracy and sensitivity

Fast response time

Wide range of adjustable Settings

Multiple communication options

Easy to install and configure

The SPAD346C3 is a differential relay manufactured by ABB. It is designed to provide reliable protection for electrical equipment by detecting and responding to abnormal electrical conditions. With its advanced features and adjustable Settings, it provides precise and efficient differential protection.

Protection of frequency controlled motors and their power transformers. The SPAD346C3 can only be used for the protection of power transformers feeding inverters. In the SPAD346C3 differential protection relay, the fundamental frequency component is digitally filtered with a Fourier filter. The filter will suppress frequencies other than the set base frequency, so the relay is not suitable for measuring the output of the inverter, that is, the relay is not suitable for protecting the power transformer or motor powered by the inverter.

Protection of short overhead lines or cable lines SPAD346C3 can be used for differential protection of overhead lines or cable lines. If the distance between measurement points is relatively long, a CT may need to be inserted to reduce the burden on the CT. The longer the distance between the CT and the protective relay, the higher the CT load (due to the resistance of the connecting wire). In addition, the actual accuracy limiting factor of CT may be too low to meet the requirements of differential protection. It is usually sufficient to use a secondary current of 1A instead of 5A. For example, if the total resistance of the secondary wire is 1.0 ohms and 5A secondary current rating is used, the CT load will be (5A) 2 x 1.0ω =25 VA. Rather than over-adjusting the CTVA rating to compensate for the increased burden, it is better to increase the CT ratio. If 1A rated secondary current is used, the load is only (1A) 2×1.0Ω=1 VA.3.6.1.

SPAD346C3 ABB 差动继电器 提供可靠高效的保护