ABB SPAJ140C 继电保护装置是一款功能强大的组合式过电流与接地故障继电器，广泛应用于直接接地、电阻接地或阻抗接地电力系统中的辐射式馈线，提供有选择性的短路和接地故障保护。以下是关于ABB SPAJ140C继电保护装置的详细解析：

主要特点

1. 综合保护功能：
• SPAJ140C型继电器包括过电流元件和接地故障元件两部分，提供全面的保护。
• 过电流元件可根据需要配置为单相、两相或三相过流保护。
• 接地故障元件提供无方向性接地故障保护。
2. 高度灵活性：
• 继电器具有灵活的跳闸和信号装置，可根据具体的应用需求进行配置。
• 提供断路器失灵保护功能，确保在断路器拒动时能够切除故障。
3. 动作原理：
• SPAJ140C是二次继电器，连接在被保护馈线的电流互感器上。
• 三相过流元件和无方向接地故障元件连续地测量被保护馈线的相电流与零序电流。
• 在故障情况下，这些元件可根据所选择的保护方式起动外部自动重合闸或使断路器跳闸。
4. 性能要求：
• SPAJ140C在技术上需满足选择性、速动性、灵敏性和可靠性四个基本要求。
• 选择性：确保仅将故障的设备或线路从电力系统中切除。
• 速动性：尽快地切除故障，减少设备和用户的损失。
• 灵敏性：在规定的范围内，无论短路点的位置和类型，都能正确反应动作。
• 可靠性：包括安全性和信赖性，确保在不需要动作时可靠不动作，在需要动作时可靠动作。
5. 应用领域：
• SPAJ140C适用于馈线保护、变压器保护以及后备保护等多种场景。
• 广泛应用于电厂、工业、钻井平台等领域。

技术和规格

• 保护功能：
• 三相定时限或反时限（IDMT）特性低定值过电流保护。
• 三相瞬时或定时限高定值过电流保护。
• 定时限或反时限（IDMT）特性低定值无方向性接地故障保护。
• 瞬时或定时限高定值无方向性接地故障保护。
• 其他特性：
• 可提供详细的故障记录和事件报告，方便故障分析和排查。
• 支持多种通信协议，方便与其他设备和系统集成。

ABB SPAJ140C relay Protection is a powerful combined overcurrent and ground fault relay that is widely used in radiant feeders in direct, resistance or impedance grounded power systems to provide selective protection against short circuits and ground faults. The following is a detailed analysis of the ABB SPAJ140C relay protection device:

Main feature

Comprehensive protection function:

SPAJ140C relay includes overcurrent element and ground fault element to provide comprehensive protection.

The overcurrent element can be configured for single-phase, two-phase or three-phase overcurrent protection as required.

The ground fault element provides non-directional ground fault protection.

High flexibility:

Relays have flexible tripping and signaling devices that can be configured according to specific application requirements.

Provides circuit breaker failure protection to ensure that the fault can be removed when the circuit breaker refuses to operate.

Operation principle:

The SPAJ140C is a secondary relay connected to the current transformer in the protected feeder.

The three-phase overcurrent element and the directionless ground fault element continuously measure the phase current and zero sequence current of the protected feeder.

In case of failure, these elements can initiate an external automatic reclosing or trip the circuit breaker according to the selected protection mode.

Performance requirements:

The SPAJ140C technically needs to meet the four basic requirements of selectivity, quickness, sensitivity and reliability.

Selectivity: Ensure that only faulty devices or lines are removed from the power system.

Quick: Remove the fault as soon as possible to reduce the loss of equipment and users.

Sensitivity: Within the specified range, regardless of the position and type of short-circuit point, it can react correctly.

Reliability: including safety and reliability, to ensure that when no action is required, no action is reliable when it is required.

Application field:

The SPAJ140C is suitable for feeder protection, transformer protection, and backup protection.

Widely used in power plant, industry, drilling platform and other fields.

Technology and specification

Protection function:

Three-phase fixed or inverse time (IDMT) characteristic low fixed overcurrent protection.

Three-phase instantaneous or fixed time high fixed value overcurrent protection.

Fixed time or inverse time (IDMT) characteristic low fixed value non-directional ground fault protection.

Instantaneous or fixed time high fixed value non-directional ground fault protection.

Other features:

It can provide detailed fault records and event reports to facilitate fault analysis and troubleshooting.

Supports multiple communication protocols for easy integration with other devices and systems.