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L1 L2 L3 RESISTIVE HEATERS HR HR HH HR CONTROL TRANSFORMER THERMOSTAT HR HR A HR R

L1 L2 L3 RESISTIVE HEATERS HR HR HH HR CONTROL TRANSFORMER THERMOSTAT HR HR A HR R

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Refer to the circuit shown in Figure 5–29. Is the thermostat contact normally open; normally closed; normally closed, held open; or nor- mally open, held closed?

**Electrical Circuit Diagram Explanation** This diagram illustrates a control circuit for resistive heaters using a control transformer and thermostat. 1. **Power Lines:** - L1, L2, L3 are the three-phase power supply lines. 2. **Resistive Heaters:** - Connected across L1, L2, and L3. - The heaters are controlled by relays labeled HR. 3. **Control Transformer:** - Converts the high-voltage input to a manageable level for the control circuit. - Connected at the junction of L1 and L2. 4. **Thermostat Control:** - The thermostat is used to regulate the heating system. - It is part of the low-voltage control circuit. 5. **Control Circuit Components:** - Relays labeled HR control the power to the heaters. - Indicators are labeled A and R for signaling or control feedback. The diagram demonstrates how a combination of transformers, relays, and thermostatic controls interlink to manage power delivery to electric heaters efficiently. This setup ensures safe and efficient operation of the heating system, maintaining desired temperature levels through an automatic control mechanism.
Transcribed Image Text:**Electrical Circuit Diagram Explanation** This diagram illustrates a control circuit for resistive heaters using a control transformer and thermostat. 1. **Power Lines:** - L1, L2, L3 are the three-phase power supply lines. 2. **Resistive Heaters:** - Connected across L1, L2, and L3. - The heaters are controlled by relays labeled HR. 3. **Control Transformer:** - Converts the high-voltage input to a manageable level for the control circuit. - Connected at the junction of L1 and L2. 4. **Thermostat Control:** - The thermostat is used to regulate the heating system. - It is part of the low-voltage control circuit. 5. **Control Circuit Components:** - Relays labeled HR control the power to the heaters. - Indicators are labeled A and R for signaling or control feedback. The diagram demonstrates how a combination of transformers, relays, and thermostatic controls interlink to manage power delivery to electric heaters efficiently. This setup ensures safe and efficient operation of the heating system, maintaining desired temperature levels through an automatic control mechanism.
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