Directional High Frequency Antenna: Directional High Frequency Antenna are likely to differ from lower-frequency ones for two reasons. These are the HF transmission/reception requirements and the ability to meet them. Since much of HF communication…
Directional Earth Fault Relay: In the case of Directional Earth Fault Relay the angular relationship of residual current and residual voltage is independent of the faulted phase and is governed only by the R/X ratio…
Directional Coupler Waveguide: We already know that a transmission-line Directional Coupler Waveguide. Its applications were indicated at the time as being unidirectional power flow measurement, SWR measurement and unidirectional wave radiation. Exactly the same considerations…
Directional Comparison Carrier Current Protection: The protection operates on the basis of comparison of the fault power flow directions at the two ends of the protected line. Operation takes place only when the flow of…
Direct Testing of Circuit Breaker: The Direct Testing of Circuit Breaker in a plant enables us to test under conditions largely representing those in actual network as well as tests of greater severity. The circuit…
Direct Synthesizer Block Diagram: A Direct Synthesizer Block Diagram is a piece of apparatus in which multiples and submultiples of a single crystal oscillator frequency are combined by addition and/or subtraction to provide a very…
Direct Digital Control: Developments in digital electronics have led to many industrial processes being computer controlled. The first system used was Direct Digital Control (DDC), in which a computer measured each variable in the process,…
Direct Current Resistivity Method: The specimen shape and the electrode arrangement should be such that the Direct Current Resistivity Method can be easily calculated. For a solid specimen, the preferable shape is a flat plate…
Direct Coupled Transistor Amplifier - Operations and Equivalent Circuit: Direct coupling is essential for very low frequency (below 10 Hz) applications such as photoelectric current, thermocouple current etc. Thermocouples are used for measurement of temperature…
Direct Coupled Inverting Amplifier: The circuit in Fig. 14-18 is termed an Direct Coupled Inverting Amplifier because, with Vi applied via R1 to the inverting input terminal, the output goes negative when the input goes positive, and…
