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# Electrical secondary circuit and its identification

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• Data category: Electric Power
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Electrical secondary circuit and its identificationPublished time: 2017
Introduction "Electrical secondary circuit and its identification" comprehensively and systematically introduces the electrical secondary circuit diagram and the selection and maintenance of secondary equipment. The emphasis is on the reading of the secondary circuit diagram. The "Electrical Secondary Circuit and its Diagram" is divided into seven chapters. The main contents are: basic knowledge of electrical secondary circuit diagram; the circuit diagram of buttons, signal lights and alarm devices; the secondary circuit diagram of power line relay protection; electrical equipment relay Electrical protection secondary circuit diagram; high and low voltage circuit breakers and operating mechanism control lines; AC and DC operating power; maintenance of the secondary circuit and DC operating power. The circuit diagrams of "Electrical Secondary Circuit and its Identification" are all derived from engineering practice and have strong practicality; the working principle is thoroughly and clearly analyzed, the description is easy to understand, the explanation is simple and easy to understand, and the diagrams are harmonious, which can be used by electrical technicians, electrical control and relay protection designers And electrical and rural electricians in industrial and mining enterprises, and also can be used for reference by teachers and students in colleges and universities.
Chapter I Basic knowledge of electrical secondary circuit diagrams Section I Basic knowledge of secondary circuit diagrams I. Secondary circuits and their components II. Types and reading methods of secondary circuit diagrams Section II Universal transfer switches I. Universal Structure and graphic symbols of transfer switches 2. LW2 series universal transfer switches 3. LW5 series universal transfer switches 4. LW8 series universal transfer switches 3. Section Current and voltage transformer wiring 1. Wiring of current transformer 2. Voltage Transformer wiring Section 4 Common symbols and labels in the secondary circuit diagram 1. Common electrical graphic symbols 2. Common text symbols and their subscript symbols 3. Number labels and small busbars and cable labels in the secondary circuit Chapter 2 Button, signal light and alarm device circuit diagram Section 1. Selection of buttons and signal lights 1. Buttons and their selection 2. Signal lights and their selection 3. Calculation of step-down resistance and step-down capacitance of signal lights 4. Step-down resistance and step-down of LED signal lights Calculation of voltage capacitance V. Calculation of parallel resistance of light-emitting diodes for display of PLC input interface 1. Circuit diagram of commonly used flashing signal device 2. Circuit diagram of impact relay 3. Central signal device 4. Alarm circuit for power failure, incoming call, undervoltage, overvoltage 5. Three-phase AC power supply neutral circuit alarm circuit Chapter 3. Power line relay Electrical protection secondary circuit diagram The first section of the power line overcurrent protection secondary circuit diagram I, the time limit overcurrent protection secondary circuit diagram two, the transistor definite time overcurrent protection circuit diagram three, the inverse time overcurrent protection secondary circuit diagram four, Transistor inverse time overcurrent protection circuit diagram V. Secondary circuit of low-voltage blocking overcurrent protection Diagram VI. Directional overcurrent protection secondary circuit diagram Section II power line current instantaneous protection secondary circuit diagram I. Current instantaneous protection secondary circuit diagram 2. Circuit diagram of transistor current quick-break protection 3. Circuit diagram of current quick-break and definite-time over-current protection Section 3. Secondary circuit diagram of busbar relay protection 1. Circuit diagram of 3-10kV disconnected busbar relay protection secondary circuit 2. Fully differential protection: Secondary circuit diagram III. Secondary circuit diagram of automatic input device for segmented bus standby power supply Section IV Power line Road ground protection and automatic device secondary circuit diagram I. Ground protection secondary circuit of small ground current system Figure 2. Secondary circuit loop of power line automatic reclosing device III. Secondary circuit diagram of automatic standby power input device Chapter 4 Electrical Equipment relay protection secondary circuit diagram Section 1 Transformer relay protection equipment secondary circuit diagram I. Current quick trip protection secondary circuit diagram II. Gas relay protection secondary circuit diagram III. Vertical differential protection secondary circuit diagram Four, zero-sequence current protection secondary circuit diagram Five, over-current protection secondary circuit with low-voltage start Figure six, transformer protection secondary circuit diagram with multiple protection functions Section two motor relay protection secondary circuit diagram I, High-voltage motor current trip and overcurrent protection secondary circuit diagram II, high-voltage motor single-phase ground protection secondary circuit diagram III, motor low-voltage protection secondary circuit diagram IV, high-voltage asynchronous motor longitudinal differential protection secondary circuit diagram V, high-voltage asynchronous Figure 6. Secondary circuit of motor phase failure protection. Figure 6. Secondary circuit of high voltage asynchronous motor protection. Figure 7. Secondary circuit of high voltage synchronous motor protection. Figure III Secondary circuit diagram of small generator relay protection I. Secondary circuit diagram of BKSF-port 2 series control cabinet II. Overcurrent and overvoltage protection secondary circuit diagram III. Secondary differential protection secondary circuit diagram Four sections of the secondary circuit of the power capacitor relay protection. Figure 1. The secondary circuit of the current quick-break protection. Figure 2. The secondary circuit of the transverse differential protection. Figure 3. The secondary circuit of the power capacitor operating system and the current quick-break protection. 4. Low-voltage reactive power compensation. Control circuit 5. High-voltage automatic reactive power compensation control circuit Chapter 5. Control circuits of high and low-voltage circuit breakers and operating mechanisms Section 1 Control circuits of high-voltage circuit breakers and operating mechanisms 1. Control circuits of circuit breakers with anti-jump devices 2. Anti-jump circuit of AC operation circuit 3. Manually operated circuit breaker control, signal line 4. Spring-operated circuit breaker control, signal line 5. CDlO electromagnetically operated circuit breaker control, signal line 6. Spring-operated SF6 circuit breaker control, signal line VII, CT7-type operating mechanism one-time reclosing circuit, second section of low-voltage circuit breaker and operating mechanism control line 1. Tianjin DW15-200 ～ 630A open circuit Electromagnet closing energy storage closing circuit 2. DW15-200 ～ 630A circuit breaker made in Shanghai Electromagnet closing energy storage closing circuit 3. DW15-200 ～ 4000A circuit breaker closing circuit 4. DW15 series circuit breaker thermal electromagnetic Over-current trip unit 5. DW15 series circuit breaker electronic trip unit 6. DW15 series and ME series circuit breaker under voltage release 7. The ME series circuit breaker motor pre-storage band with energy release closing circuit De-excitation switch control circuit 1, BT9404 de-excitation switch and control circuit 2. DW10M-type de-excitation switch and control circuit 3. DW16M-630-type de-excitation switch and control circuit 4. DM2-2500-type de-excitation switch and control circuit Chapter VI AC and DC operating power supply Section I. DC operating power supply 1. Classification of DC load and application range of DC power supply 2. Typical DC operating power supply 3. Common silicon rectifier power supply equipment 4. Secondary circuit of DC operating power supply Section Uninterruptible Power Supply (UPS)
I. Introduction to Uninterruptible Power Supply (UPS) II. Technical data of several commonly used UPS III. Selection of UPS IV. Requirements for spring-loaded UPS and selection of matching cables Section III Power Switching Circuits I. Uninterruptible power supply of battery DC screen Switching line 2. Automatic switching line of relay protection operation power. 3. Switching line of accident lighting power supply. Chapter 7. Maintenance of secondary circuit and DC operation power supply. Section 1. Test and maintenance of secondary circuit. 1. Relay protection and electrical measurement. ： Requirements of the secondary circuit 2. Inspection of the secondary circuit 3. Testing of the secondary circuit 4. Maintenance of the secondary circuit 5. Troubleshooting of the secondary circuit Section 2. Use and maintenance of DC operating power supply 1. Charge of lead-acid battery Discharge requirements 2. Charge and discharge requirements for cadmium nickel batteries 3. Use and maintenance of batteries 4. Use and maintenance of maintenance-free lead-acid batteries 5. Use and maintenance of silicon rectifiers References