PST640 medium-voltage relay for transformer protection, control, measurement and supervision.

Distribution system operators need protection and control devices that are reliable, secure, compatible, and easy to integrate with existing devices. But replacing your installed base was complicated and time-intensive—until now.

Our protection relays use a stable yet innovative platform with 20 years of successful experience. In one IED, you gain protection, control, measurement, and supervision functions.

The PS640 series supports multiple communication protocols including IEC 61850 Edition 2.0 and Modbus. Additionally, the PS640 series IEC 61850 standard facilitates horizontal communication (GOOSE) between devices.

Ethernet redundancy with the PS640 series can be achieved via the Parallel Redundancy Protocol (PRP) or the Rapid Spanning Tree Protocol (RSTP) supported by switches managing a self-healing ring network.

The PST640 transformer protection, control, measurement and supervision relay has a 1A/5A input current rating that is settable.

PST640 supports Ethernet-based SNTP and dedicated IRIG-B time synchronization.

Fully interoperable with Hitachi Energy’s tools suite, the PS640 series can be used in isolated, resistance-grounded, compensated grounded, and solidly grounded networks. With our PS640 series you can rely on high cybersecurity standards, as well as our long legacy in power systems, industry standards, and customer support.  

No more complex configuration

This preconfigured device is easy to learn and use, providing a simple hardware architecture for your team to commission and maintain. Less training and engineering are needed, which saves you time and resources while improving safety.

PST640 supports a maximum of four setting groups, whose values can be modified from the local human-machine interface (LHMI) or the PCM600 configuration tool.

The PS640 PCM600 connectivity package provides a simple and easy interface: It fully integrates PCM600 without requiring any additional tools. 

Application features

• Provides transformer differential protection and comprehensive backup protection both for high-voltage and low-voltage winding
• Transformer differential protection, including instantaneous differential protection, and ratio restraint differential protection, zero-sequence which can be used for protecting against transformer phase-to-phase, winding inter-turn, and bushing faults

Human-machine interface features

• Equipped with large LCD screen
• Single line diagram (SLD) with circuit breaker position indication
• 11 preconfigured LEDs can be lit with red, yellow, or green light
• Local/remote control

Communication features
 

• Compliant with IEC 61850 Edition 2.0
• Support of Mobus communication protocol
• Support of RSTP and PRP ethernet network redundancy
• Support of SNTP and dedicated IRIG-B time synchronization
• Two Ethernet ports