Taking the verification of a single-phase AC voltmeter as an example:
1. Connect the input power supply AC380V
2. Connect the AC operating voltage output power cord to the voltmeter
3. Check and confirm the wiring is correct, then turn on the main power switch
4. Return the voltage regulator to zero, and press the "Close" button,
5. Then press the "Close" button for AC operating voltage on the panel
6. Slowly adjust the output adjustment knob to raise the voltage to the required value, and observe the voltmeter.
7. After the test is completed, first press the "Open" button for AC operating voltage on the panel, then press the main "Open" button on the panel. Then, disconnect the main power switch
Technical Conditions of Mining-Specific Multifunctional Control Console
Input power: Three-phase four-wire AC 380V
Output voltage and current:
1. Three-phase AC 0 – 10A output (<100V, adjustable) one set
2. Three-phase AC100V output (fixed value) one set
3. AC operating voltage output AC 0～400V, at 220V, current less than 10A
4. DC operating voltage output DC 0～260V
5. DC closing power supply output DC 0～300V (rated current 100A, short-time working current 300A) one set
6. Single-phase AC220V output (fixed value, socket form) two sets,
7. Three-phase AC380V output (fixed value, terminal form) one set,
8. Dimensions: 560*520*850mm
9. Weight: 45kg
Description
1. Connect three-phase four-wire AC380V
2. Connect the DC300V output to the load
3. Turn the output adjustment knob counterclockwise to zero.
4. Check and confirm the wiring is correct
5. Close the power switch
6. Slowly adjust the output adjustment knob to raise the voltage to a suitable value.
Precautions
After the test is completed, first turn the output adjustment knob counterclockwise to zero, then disconnect the power switch. Only after the discharge is complete can you start disconnecting the wires.
Note: This test bench can be designed and manufactured according to user requirements.
Safety Technical Operating Procedures
1. When working on panels that are fully or partially energized, the equipment under repair should be clearly marked to distinguish it from operating equipment.
2. When performing work with significant vibration such as drilling on protection panels, measures should be taken to prevent tripping of operating equipment.
3. All secondary windings of current transformers and voltage transformers should have permanent and reliable protective grounding.
4. When working on the secondary circuit of an operating current transformer, the following safety measures should be taken:
1. It is strictly forbidden to open the current circuit;
2. To reliably short-circuit the secondary coil of the current transformer, short-circuit pieces and short-circuit wires must be used;
3. Any work on the circuit and conductors between the current transformer and the short-circuit terminal is prohibited;
4. Work should be supervised by a dedicated person, use insulated tools, stand on an insulating mat, and the permanent grounding in the circuit must not be disconnected.
5. When working on the secondary circuit of an operating voltage transformer, the following safety measures should be taken:
1. Strictly prevent short circuits or grounding;
2. Use insulated tools, wear insulating gloves, and if necessary, deactivate relevant relay protection devices before work;
3. When connecting temporary loads, dedicated switches and fuses must be installed;
4. When conducting live tests on the secondary circuit, to prevent reverse voltage transformation from the secondary side to the primary side, in addition to disconnecting the secondary circuit, the primary fuse should also be removed;
5. Before energizing or conducting withstand voltage tests on the secondary circuit, notify the duty personnel and relevant personnel, arrange for someone to guard the site, check the circuit, and confirm no one is working before applying voltage.
6. Personnel inspecting protection and secondary circuits are not allowed to perform any switching operations without the permission of the duty personnel.
