[Temperature monitoring - TMS-KTY]

TMS-KTY

Basic information
The thermistor motor protection relay monitors the temperature of windings in electrical machines and transformers in conjunction with KTY-thermistors. It provides safety protection against thermal overload.

Application
The thermistor motor protection relay is used for:

• Heavy-duty starting (Overloading).
• Restricted cooling.
• Frequent switching.
• Blocked rotor.
• Phase failure and the resultant temperature increase of windings.
• Heating and ventilating.
• Operating with a frequency converter.
• Transformer protection.
• Surface temperature control of power semiconductors.

General function
The thermistor motor protection relay monitors the temperature of the KTY-sensor. In normal operation the relay is activated, e.g. there is no thermal overload of the device. When the temperature of the KTY-sensor exceeds the tripping point, the motor protection relay is deactivated, (e.g. Relay switches off) and triggers the power cut-off to the equipment, which it is monitoring. A fall in temperature causes re-activation of the relay (e.g. Relay switches on) and allows the motor (transformer) to be re-started. The relay switches on automatically when the temperature has fallen by 5°C approx. Breaks, in the sensor circuit, are indicated by means of an LED and the motor protection relay is deactivated. 

Advantages

• Temperature switching point continuously adjustable over a wide range.
• Standardised semi-conductors of a similar type are completely interchangeable.
• Worldwide availability of the KTY sensor.
• Wire breakage in the sensor circuit indicated.
• The device operates according to the closed circuit current principle. This guarantees the secure stopping of the electrical machine, even in the event of a power blackout.
• Motor winding temperature measured directly.
• Temperature monitoring continuously in a wide range of temperature.
• Optimum housing dimensions.
• Tripping point according to customer’s requirements.
• Excellent value for money.