GL-DG-S  Advanced Electrical and Electronic Experimental Device

Ⅰ、Overview

"GL-DG-SAdvanced Electrical and Electronic Experimental Device" is a new generation of experimental device launched by our company based on extensive solicitation of opinions and suggestions from experimental instructors from various universities. This experimental device fully considers the current situation and development trend of the laboratory, with the purpose of open experiments and improving students' hands-on ability, and makes large-scale improvements and innovations in structure and performance. It retains many advantages of our traditional experimental devices, such as all-round personal safety protection (voltage leakage protection, current leakage protection, overcurrent protection, transformer isolation protection, etc.), self-protection of instruments and meters, etc., and combines current experiments.

Ⅱ、Features:

1. Strong comprehensiveness: This experimental device integrates all experimental projects of basic electrical courses in various domestic colleges and universities. Users can purchase experimental components as needed, and the depth of the experiment can be flexibly adjusted as needed. Popularization and improvement can be organically combined according to the progress of teaching.

2. Strong integrity and consistency: The AC and DC instruments, AC and DC power supplies, signal sources (including frequency meters) and commonly used experimental devices required for the experiment are closely combined with the needs of the experiment and concentrated on the experimental device, which is convenient for teachers to organize and guide experimental teaching.

3. Strong scientificity: The device occupies less space, saves experimental room, and reduces infrastructure investment; the laboratory is neat and beautiful, improving the experimental environment; the experimental content is rich and the design is reasonable. In addition to deepening theoretical knowledge, design and comprehensive experiments can also be set up in combination with actual conditions. According to the specific conditions of the experimental content, the sockets and wires of the strong and weak parts are separated. The strong part uses a high-reliability retractable elastic pistol plug connection wire (there is no possibility of electric shock), and the weak part uses an elastic beryllium light copper exposed structure connection wire. Both wires can only be matched with the sockets of the corresponding inner holes, which greatly improves the safety and rationality of the experiment.

4. Easy layout and wide field of vision: The experimental device is suitable for the current development needs of the laboratory. Students can sit down to listen to lectures or do experiments without feeling depressed, and it is also convenient for teachers to provide guidance.

Ⅲ、Technical performance

1. Input power: three-phase four-wire (or three-phase five-wire) 380V±10% 50Hz

2. Working environment: temperature -10℃～＋50℃, relative humidity ≤85% (25℃) altitude<4000m

3. Installed capacity:<1.5KVA

4. Weight: 150kg

5. The insulation resistance of each phase line of the power supply to the ground is ≥10MΩ; the insulation resistance of the live part of the experimental table to the ground is ≥10MΩ

6. Dimensions: 166×73×140cm

Ⅳ、Device configuration

This experimental device is mainly composed of a power instrument control panel, a laboratory table, a laboratory box, etc.

(Ⅰ) Power supply and instrument control panel

The control panel is an iron double-layer matte dense-grained spray-coated structure with an aluminum panel. It provides AC power, DC regulated power supply, constant current source, signal source (including frequency meter), various test instruments and experimental devices for the experiment. The specific functions are as follows:

1. Main control function panel

1.1 Three-phase 0~450V and single-phase 0~250V continuously adjustable AC power supply, equipped with a three-phase axial linkage voltage regulator with a specification of 1.5KVA/0~450V/3A, which overcomes many shortcomings of three single-phase voltage regulators with chain structure or gear structure. The adjustable AC power output is equipped with electronic circuit overcurrent protection technology and fuse dual protection function, which can automatically protect against phase-to-phase and line-to-line overcurrent and direct short circuit, overcoming the trouble of replacing fuses. Equipped with three pointer-type AC voltmeters, which can indicate the three-phase grid voltage and the three-phase voltage regulation output voltage respectively through the switching switch, with LED phase loss indication.

1.2 A 220V/30W fluorescent lamp tube is provided for experimental use. The four ends of the lamp tube are connected to the panel terminals for convenient experiments.

1.3 Two 220V power dark sockets are provided.

2. DC power board

2.1 Provides two 0.0~30V/1A adjustable voltage-stabilized power supplies, with cut-off short-circuit soft protection and automatic recovery functions, with 3 1/2" LED display, accuracy + (0.5% reading + 2 digits) three-and-a-half-digit digital DC voltmeter and switching switch, low voltage (1.5V) also has 1A current output and other functions.

2.2 Provide a set of 0～200mA continuously adjustable constant current source, divided into 2mA, 20mA, 500mA three gears, load stability ≤5×10－4, equipped with three-and-a-half-digital display current meter indication. Adjustment accuracy 1/1000, with output open circuit and short circuit functions.

3. Instrument panel

(1) 1 AC digital voltmeter

Adopts a new high-performance RMS true effective value converter, equipped with a high-speed MPU unit design, and realizes the human-computer dialogue function control mode through the digital display window. With automatic range, measurement range: 0～500V. Measurement accuracy is 0.5 level.

(2) 1 AC digital ammeter

Adopts a new high-performance RMS true effective value converter, equipped with a high-speed MPU unit design, and realizes the human-computer dialogue function control mode through the digital display window. With automatic, measurement range: 0～5A. Measurement accuracy is 0.5 level.

(3) Single-phase and three-phase power and power factor meter

Consists of 24-bit dedicated DSP, 16-bit high-precision AD converter and high-speed MP U unit design, through key control, digital display window to achieve human-computer dialogue function control mode. The software adopts RTOS design ideas, and is equipped with PC monitoring software to enhance analysis capabilities. It can measure the voltage, current, active power, reactive power, power factor, frequency, etc. of the circuit. The power measurement accuracy is 0.5 level, the power factor measurement range is 0.3~1.0, the voltage and current range is 0-500V and 0-5A, and it can automatically identify the load properties (inductive display "L", capacitive display "C", pure resistance is not displayed), and can store measurement data for reference at any time. It also has computer communication function.

(4) One DC digital voltmeter: measurement range 0~200V, with digital display function (four-digit display), accuracy 0.5 level, with over-range protection function.

(5) One DC digital milliammeter: measurement range 0~2000mA, with digital display function (four-digit display), accuracy 0 level, with over-range protection function.

(6) Signal source and frequency meter

Output waveform: square wave, sine wave, triangle wave, two pulses, four pulses, eight pulses, single shot, output after power amplification; output frequency: 2Hz-2MHz, frequency continuously adjustable; amplitude adjustment range: 0-15VP-P, with 20dB, 40dB attenuation function;

With 6-digit digital frequency meter, it can be used as a monitoring signal source output or as an external frequency meter, with an accuracy of 0.5 level, and the frequency meter measurement range is 0-2MHz.

(II) Experimental table

The experimental table is made of iron double The experimental table is a matte dense pattern spray-painted structure (750mm high), mainly composed of a desktop panel (white edging), side feet (black, bent and welded with steel plates to 750mm*50mm*20mm), drawers, universal wheels and fixed adjustment structure. Experimental desktop panel: fireproof, waterproof, wear-resistant, high-density board, thickness 27mm. Side feet: A set of high-strength side feet are installed on both sides of the experimental table, and the main material is 2.0mm high-strength iron plate. The experimental table has two large drawers, and there is a storage cabinet underneath for placing tools , store experimental hanging boxes and materials, etc. The table body steel plate is 2mm thick, and the surface is treated by pickling, phosphating, and electrostatic matte dense spraying. The paint used is an environmentally friendly paint of a well-known domestic brand. The metal accessories such as handles and locks are high-quality accessories that are rust-proof, wear-resistant, and have standardized dimensions. The table body color is separated by milky white and light blue, and the overall appearance is beautiful and generous, coordinated with the laboratory environment, and the nameplate and logo meet national standards.

There are four universal wheels and four fixed adjustment mechanisms at the bottom of the experimental table. The four universal wheels use polyurethane universal casters, which are wear-resistant and equipped with brake mechanisms. There are also four easy-to-move and fixed adjustment mechanisms under the experimental table, all of which are made of stainless steel, which is conducive to the fixation of the experimental device. When the device is placed and not moved, the universal wheels are lifted through the anchor structure to prevent the table from sliding. The spraying plastic powder of the experimental table uses imported plastic powder, which is non-toxic, odorless, harmless gas, wear-resistant, high temperature, and waterproof.

The device adopts a steel and wood structure, the table body is firm and solid, well fixed, and all parts of the table body, including the cabinet door, are designed with reinforcing ribs.

(III) Experimental box

1. Basic circuit experiment (I)

Complete the meter modification experiment (equipped with a mirror pointer precision milliammeter), volt-ampere characteristic experiment, maximum power transmission condition determination experiment, voltage source and current source equivalent transformation experiment and related devices.

2. Basic circuit experiment (II)

Complete the superposition principle, Kirchhoff's law (judgment experiment), Thevenin theorem, Norton theorem and two-port network, reciprocity theorem experiment.

3. Basic circuit experiment (III)

Complete the controlled source, gyrator, negative impedance converter experiment, and use standard network symbols for graphics.

4. Basic circuit experiment (IV)

Complete the first-order and second-order dynamic circuits and circuit state trajectory observation experiments.

5. Basic circuit experiment (V)

Complete R, L, C series resonance (hollow inductor), R, C series and parallel frequency selection network, R, C double T network experiment.

6. AC circuit experiment (I)

Complete the study of sinusoidal steady-state AC circuit phase quantity (fluorescent lamp power factor improvement experiment), black box Sub-experiment (R, L, C component characteristics and parameter determination)

7. AC circuit experiment (II)

Complete the three-phase circuit (three bulbs in parallel per phase) experiment.

8. Component box

Provide experimental devices such as resistors, capacitors, inductors, potentiometers, decimal adjustable resistors (6 bits) required for the experiment.

9. Three-phase capacitor box

Provide three-phase high-voltage capacitors, each with a capacitance of 1uF/500V, 2.2uF/500V, and 4.7uF/500V.

10. Relay contact Control (I)

Provide one AC contactor (coil voltage is 220V), one thermal relay and one simulated bulb, and three lighted buttons (one yellow, one green, and one red).

11. Relay contact control (II)

Provide two AC contactors (coil voltage is 220V), one time relay (power-on delay, coil voltage is 380V), as well as energy-consuming braking power transformer, rectifier diode, resistor, etc.

12. DQ20-1 three-phase squirrel cage motor (△380V, 100W)

The three windings of the motor have been led out, and the wiring is convenient.

13. Experimental connection wire: According to the characteristics of different experimental projects, two different experimental connection wires are equipped. The high-voltage circuit adopts a high-reliability sheath structure pistol plug connection wire (there is no possibility of electric shock), and the oxygen-free copper wire is drawn into a hair-thin multi-strand wire to achieve the purpose of ultra-softness. It is covered with a nitrile polyvinyl chloride insulation layer, which has the advantages of softness, high voltage resistance, high strength, anti-hardening, and good toughness. The plug adopts a solid copper piece with a beryllium light copper shrapnel, containing 128 strands of copper wire, and the contact is safe and reliable; the low-voltage circuit adopts an elastic fully enclosed experimental wire, the wire is soft, and contains 128 strands of copper wire. Both wires can only be matched with the socket of the corresponding inner hole, and cannot be mixed, which greatly improves the safety and rationality of the experiment.

V、The main advantages and safety protection system of the device

1. Three-phase four-wire (or three-phase five-wire) power input, the total power supply is controlled by a three-phase key switch.

2. The power supply of the control panel is controlled by the contactor through the start and stop buttons.

3. The three-phase AC power supply is continuously adjustable from 0 to 450V, and the single-phase AC power supply is continuously adjustable from 0 to 250V. It is equipped with a three-phase axial linkage auto-coupling voltage regulator (1.5KVA) to better meet the requirements of teaching experiments.

4. The panel is equipped with electrical protection such as leakage protection, overload protection, circuit breaker protection and transformer isolation protection to ensure personal safety and equipment safety.

5. The panel is equipped with a set of current type leakage protection devices. If there is leakage on the control panel, the leakage current exceeds a certain value, and the power supply is cut off.

6. The secondary side of the three-phase voltage regulator on the panel is equipped with a set of overcurrent protection devices. If the output of the voltage regulator is short-circuited or the load is too large, the current exceeds the set value, and the system will alarm and cut off the main power supply.

7. The measuring instruments are of high precision and adopt digitalization, intelligence and human-computer dialogue mode, which is in line with the development direction of modern measuring instruments. Various power supplies and various instruments have reliable protection functions.

8. The experimental connection wires and sockets adopt different structures, which are safe, reliable and prevent electric shock.

VI、Experimental projects of Electrical and Electronic Experimental Device

1. Basic electrical experiments

(1) Use of basic electrical instruments and calculation of measurement errors

(2) Methods for reducing instrument measurement errors

(3) Instrument (voltmeter, ammeter) range expansion experiment

(4) Circuit component volt-ampere characteristic mapping

(5) Potential, voltage measurement and circuit potential diagram drawing

(6) Kirchhoff's law verification and fault judgment

(7) Superposition principle verification and fault judgment

(8) Equivalent transformation of voltage source and current source

(9) Verification of Thevenin theorem

(10) Verification of Norton theorem

(11) Determination of maximum power transmission conditions

(12) Two-port network experiment

(13) Reciprocity theorem experiment

(14) Controlled source VCVS, VCCS, CCVS, CCCS Experimental research

(15) Observation and measurement of typical electrical signals

(16) RC first-order circuit response test

(17) Second-order dynamic circuit response research

(18) R, L, C component impedance characteristic measurement

(19) RC series and parallel frequency selection network characteristic test

(20) R, L, C series resonant circuit research

(21) RC double-T frequency selection network

(22) Circuit state trajectory observation

(23) R, L, C component characteristics and AC parameter measurement - judgment experiment

(24) Using three-meter method to measure AC circuit equivalent parameters

(25) Sinusoidal steady-state AC circuit phase research Research

(26) Mutual inductance experiment

(27) Three-phase AC circuit voltage and current measurement

(28) Three-phase circuit power measurement

(29) Single-phase watt-hour meter calibration

(30) Power factor and phase sequence measurement

(31) Negative impedance converter and its application

(32) Rotator and its application

2. Relay contact control experiment

(1) Three-phase asynchronous motor inching and self-locking control

(2) Three-phase asynchronous motor forward and reverse control

(3) Three-phase asynchronous motor Y-Δ step-down starting control

(4) Three-phase asynchronous motor energy consumption braking control

(5) Three-phase asynchronous motor starting sequence control

Synchronous PC version:

GL-DG-S  Advanced Electrical and Electronic Experimental Device   https://www.biisun.com/home/category/detail/id/155.html