ABB SPAE 010/011（RS 493 001-MA）

Brand:ABB

Model: SPAE 010/011

Part No: RS 493 001-MA

Describe: High Impedance Protection Relay

Status: New/Used

The protective relays type SPAE 010 and SPAE 011 form in their applications a differential protection of the high impedance type. The differential protection of the high impedance type is used as earth-fault protection for transformers, generators and motors. The difference between the two relays is the auxiliary supply voltage required. For SPAE 010 the auxiliary supply voltage is within the range 80. . .265 V ac or dc and for SPAE 01 1 the range is 18...80 V dc.

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ABB SPAE 010/011（RS 493 001-MA）

The relay measures voltage, though it is connected to the current transformers of the protected object, see block diagram. The earthfault current is measured on either side of the protected object and the differential current is forced to flow through an external voltage dependent resistor Ru. The voltage thus created is measured by the relay.

The high impedance type differential relay is stable for all types of faults outside the zone of protection. The relay is stabilized by means of resistors in the differential circuit. The stabilizing resistors are integrated into the relay.

The stability of the protection is based on the circumstance that the impedance of a current transformer quickly decreases as the current transformer saturates. The reactance of the excitation circuit of a fully saturated current transformer approaches zero and the impedance is purely winding resistance. By means of the resistor in the differential current circuit the secondary current fed by a non-saturated current transformer is forced to flow through the secondary circuit of a saturated current transformer.

Features

• High impedance type differential current earth-fault protection, so called restricted earth-fault relay

• Earth-fault protection relay for transformers, motors and generators

• Required stabilizing resistors built-in into the relay

• Short total operating time together and high stability

• High immunity against all types of mechanical and electrical interference

• High accuracy and long time stability features due to a digital and software based design

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继电器测量电压，尽管它连接到受保护对象的电流互感器，见框图。接地故障电流在受保护对象的两侧进行测量，差动电流被迫流过外部电压相关电阻器Ru。由此产生的电压由继电器测量。
高阻抗型差动继电器对保护区外的所有类型的故障都是稳定的。继电器通过差分电路中的电阻器稳定。稳定电阻器集成在继电器中。
保护的稳定性基于电流互感器的阻抗随着电流互感器饱和而迅速降低的情况。全饱和电流互感器励磁电路的电抗接近零，阻抗纯粹是绕组电阻。通过差分电流电路中的电阻器，非饱和电流互感器馈送的次级电流被迫流过饱和电流变换器的次级电路。
特性
• 高阻抗型差动电流接地故障保护，即所谓的限制性接地故障继电器
• 变压器、电机和发电机的接地故障保护继电器
• 继电器内置所需的稳定电阻器
• 总运行时间短，稳定性高
• 对所有类型的机械和电气干扰具有高免疫力

• 由于数字和基于软件的设计，具有高精度和长时间稳定性的特点

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