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Design and graphical communication
Published in Mike Tooley, Engineering GNVQ: Intermediate, 2012
However, it is more usual to use the term wiring diagram where the components are hard wired, as in the wiring up of a building or the manufacture of a control cubicle. Architects use circuit diagrams to show the electrical installation of buildings. They also provide installation drawings to show where the components are to be sited. They may also provide a wiring diagram to show how the cables are to be routed to and between the components. The symbols used in architectural installation drawings and wiring diagrams are not the same as those used in circuit diagrams. Examples of architectural and topographical electrical component symbols are shown in BS: PP7307.
Electrical schematic and wiring diagrams
Published in Adrian Waygood, An Introduction to Electrical Science, 2013
A wiring diagram is a somewhat-simplified representation of how a circuit actually looks. All the various components are generally represented as simplified pictorials of those components, located on the diagram roughly where the real components (such as terminal blocks, switches, lamps, etc.) would actually be relative to each other, but usually much closer together, and the diagram shows all terminal markings, together with the conductor colours, etc. Indeed, it shows any information that might be helpful to whoever is going to connect the circuit together.
Programmable Controllers
Published in William S. Levine, The Control Handbook: Control System Fundamentals, 2017
An LD reflects a conventional wiring diagram (Figure 17.18). A wiring diagram shows the physical arrangement of the various components (switches, relays, motors, etc.) and their interconnections, and is used by electricians to do the actual wiring of a control panel. The LDs are more schematic and show each branch of the control circuit on a separate horizontal row (the rungs of the ladder). They emphasize the function of each branch and the resulting sequence of operations. The base of the diagram shows two vertical lines, one connected to a voltage source and the other to ground.
Study on saving energy for electric auxiliary systems of electric bus
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Yong Luo, Yan-Ping Tan, Li-Fu Li
As can be seen from Figure 2, the working process of EACU is as below. EACU firstly calculates the required working status values of EAS according to driving conditions, then transmits those working target values to E-A/C, EHPS and electric air compressor. E-A/C, EHPS and electric air compressor then adjust working status to reach the given target values. Taking E-A/C as an example, once E-A/C controller receives the target temperature value, E-A/C controller will manage the working status of E-A/C compressor to change the cooling by referring to present bus interior temperature and control rules, for reaching the target temperature from EACU. Figure 3 is the main electrical wiring diagram of bus based on EACU.
New Method of Transformer Differential Protection Based on Graph Fourier Transform
Published in Electric Power Components and Systems, 2023
Liao Xiaojun, XianZheng Feng, Xiaoru Wang, Zhang Li
The fault is an inner three-phase short-circuit fault in the 3# transformer area of a 220 kV substation. Since the 2# and 3# transformers operate in parallel, To the 2# transformer becomes an external fault. The main electrical wiring diagram when the fault occurs is shown in Figure A3-1 in the appendix: Example 3-1: 2# transformer test during external fault2# transformer’s current waveform and differential current waveform are shown in Figure A3-2 in the appendix. Figure 6 is a comparison diagram of the differential current and restraint amount and k value of phase A during the external fault. Refer to Table 6 for the average current per unit value of the corresponding fault during the fault. At t = 20ms, the 2# transformer experience an external fault, the differential current is an unbalanced current, and the per unit value is 1.26, so it enters into the restraint zone. According to Figure 6 and Table 6, the GFT differential restraint component gr is obviously greater than the half of sum and maximum restraint amount during the external fault, while the differential component gd is less than the differential current, so the braking capability of the external fault is strong. Its k value is only half of the sum and maximum braking method.Example 3-2: 3# transformer test during inner fault3# transformer’s current waveform and differential current waveform are shown in Figure A3-3 in the appendix. Figure 7 is a comparison diagram of the differential current and restraint amount and k value of phase A during the inner fault. Refer to Table 7 for the average current per unit value of the corresponding fault during the fault.