IES-521 Power Transformer Protection

IES-521 is designed specifically to protect various types of power transformers, including two-winding transformers, three-winding transformers (up to 6 branches), auto-transformers as well as shunt reactors in any voltage level. The device contains control measurement and monitoring functions. With its modular structure as well as flexible and powerful engineering tool, IES-521 offers future-oriented system solutions with high investment security and low operating costs. The device is freely programmable. Functional logic diagrams can be developed with the use of graphical programming tool which also supports the configuration of binary inputs and outputs, analog inputs, control buttons, LEDs, disturbance recorder, event recorder, and user interface. Freely programmable logic makes it possible to modify typical functional logic diagrams considering a peculiar nature of the protected object. Three basic types of standard 19”case help to choose the most appropriate solution.

Multi-Function Capability
Advanced Operating Principle
High Sensitivity
Engineered for Broad Deployment

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Product Highlights Technical Specification Industries We Serve

Product Highlights

Multi-Function Capability

Highly integrated functions. The main protection and backup protection can be configured together or separately.

Advanced Operating Principle

Provides a variety of inrush current blocking methods. The self-adaptive blocking criterion makes the protection act quickly even when the no-load transformer is switched onto a slight fault.

High Sensitivity

For single-phase ground fault inside the transformer, the zero-sequence differential protection has high sensitivity.

Engineered for Broad Deployment

The differential protection can be expanded up to 6 transformer sides. Any side can be taken as the reference side. With various corner modes, the transformer corner can be set flexibly.

Technical Specification

Dimensions (WxHxD)

455 mm×266.7 mm×233.5 mm; (6U height, 1/1 chassis, excluding mounting bracket); 221.3 mm×266.7 mm×233.5 mm; (6U height, 1/2 chassis, excluding mounting bracket)

Mounting Way

Surface mounting, flush mounting, semi-flush mounting, wall mounting, and panel mounting

Material

Stainless stee

Protection Level(Front Panel)

IP54

Protection Level(Side Panel)

IP40

Protection Level(Rear Panel)

IP30

Communication Ports

2 or 4 100Base-TX RJ45 Ethernet ports; 2 or 4 100Base-FX optical ports; 2 RS-485 serial ports for SCADA communication; 1 RS-485 serial port for clock synchronization; 1 front RJ45 port for debugging

Clock Synchronization

IRIG-B; PPS; IEEE 1588; SNTP

Functions

Transformer differential protection (87T); Inrush blocking; CT saturation blocking; Overexcitation blocking; CT circuit failure blocking; Amplitude compensation; Phase angle compensation; Reactor differential protection (87R); Restricted earth-fault protection (64REF); Phase overcurrent protection (50/51P); Earth-fault protection (50/51G); Impendence protection (21)