Changing relay

In the manufacture of elaborate colour changing stars, we put a layer called Changing Relay betv/een two colour layers in order to create the illusion that all the stars change their colour clearly and simultaneously in spite of the deviation in burning. The composition of the changing relay must produce a wealc light of neutral colour and is set out as follows ... 

Color-change relay or dark prime (used in fireworks) has good ignition characteristics, plus It burns without producing much visibie light. 

In addition to facilitating complete burning, there is an aesthetic advantage to using the color-change relay. 

COLOR CHANGE RELAY-DARK PRIME (Continued)... 

Thermal Dispersion. Thermal dispersion level switches are used on appHcations where multiple shifts inhquid characteristics are present. The unit is responsive only to a change in the thermal conductivity of the Hquid and ignores shifts in specific gravity, dielectric, density, temperature, and pressure. Units are used for alarm signal however, pump control maybe obtained using two units with a latching relay. 

Position changing nieehanism (99 Motor protection relay... 

For determining the off potentials of cathodically protected pipelines, time relays are built into the cathodic protection station to intermpt the protection current synchronously with neighboring protection stations for 3 s every 30 s. The synchronous on and off switching of the protection stations is achieved with a synchronous motor activated by a cam-operated switch. The synchronization of the protection station is achieved as follows a time switch is built into the first protection station. An interruption of the protection current is detectable at the next protection station as a change in the pipe/soil potential. Since the switching time is known, the time switch of the second protection station can be activated synchronously. The switching of further protection stations can be synchronized in the same manner. 

With the advent of digital relays, the situation changed dramatically. Not only could the relays record the fault current and voltage and calculate the fault location, they could also report this information to a central location for analysis. Some digital devices are used exclusively as fault recorders. 

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