WD32-013

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Protection relays and systems are critical to the reliability of electric grids of all sizes. The WD32-013 is a flagship device in this area that is integrated into many grid applications. This document shall explore the application field of the WD32-013 and it’s working principle.

The WD32-013 is an under-frequency protection relay. It is used in power systems when a source of power generation trips, either accidentally or deliberately, resulting in a sudden decrease in frequency of the power system. It is designed to detect the decrease in frequency and shut down the generator or disconnect an electrical load at the and of the power system, thereby protecting it from destructive problems irrelevant of where the frequency fall originated from. Another application of the device is voltage and phase unbalance under-frequency protection and trip co-ordination with other protection relays.

For example, in a large power system with many sources of power generation, it may be necessary to shut down or disconnect one of the sources due to an equilibrium problem, but without affecting the rest of the system. The WD32-013 can detect the change in power frequency and act accordingly, tripping the relevent generator and isolating its load, allowing the rest of the system to remain up and running, while the offending generator can be dealt with.

The working principle of the WD32-013 is based on time delayed frequency comparison. It is a highly sensitive relay, and it monitors both the average and instantaneous power frequencies to determine under-frequency events. The time delay detection algorithm allows for careful discrimination between a minor drop in frequency and an actual under-frequency event, minimizing unnecessary tripping of the power source or load.

The WD32-013 consists of a power frequency monitor and a protection relay. The power frequency monitor detects the frequency of the current and calculates the average change in frequency as well as the avergae and instantaneous values. When the instantaneous value drops below the minimum set-point, the protection relay is activated within a few milliseconds, with response times going up to 4 seconds.

The protection relay can be configured individually for each application. Different protection levels, trip curves and time delay settings can be adjusted according to the needs of the application and the desired under-frequency protection level. It also features an isolated analog output for easy logging of the current power frequency.

In summary, the WD32-013 is an advanced under-frequency protection relay. It is designed to detect sudden drops in frequency and shut down the generator or disconnect an electric load, thereby helping to protect the power system from damaging events. It is highly customizable, allowing users to tailor the device to individual applications and protection levels. Its use is essential for powering secure and reliable grids of all sizes.

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