Explanation of explosion-proof operation column related knowledge

Explosion-proof operation column is a flexible control system, can provide customers with standard or special requirements of the local control unit or display unit. Generally speaking, the electrical control equipment of explosion-proof equipment in the control room dedicated control box, but the controlled equipment and control equipment in different places, the use of explosion-proof operating column, more convenient operation and control.

As the explosion-proof operation column for motor over-stopping, control conversion, signal switching, instrument measurement and display in the work site, its applicable places are as follows:
     1、 It is applicable to the hazardous places in Zone 1 and Zone 2 with explosive gas environment;

2、Suitable for combustible dust locations in zones 21 and 22;

3、Applicable to temperature groups T1-T6;

4、Widely used in petroleum mining, refining, chemical industry, military industry and other hazardous environments and offshore oil platforms, tankers and other places.
      Dustproof and waterproof explosion-proof operation column in normal operation can produce electrical isolation, spark components into the explosion-proof enclosure, and take the casting type, sand-filled type, oil type or positive pressure type and other forms can achieve the purpose. But for dustproof and waterproof electrical equipment is for the normal operation will not cause electrical isolation, electrical sparks and the risk of sustained high temperature of the equipment, if the structure of the structure to take more safeguards, sparks and over-temperature conditions, you can further improve the reliability and stability of electrical equipment. Thus, this type of electrical equipment in normal operation when there is no ignition source, but suitable for high-risk environments.

I. Technical characteristics of explosion-proof operating column:

1. Choose to increase the safety of the plastic shell or explosion-proof aluminum alloy structure, according to their own needs to configure a variety of explosion-proof components.
2. The main block construction can be freely customized according to customer needs;
3. The shell design is made of engineering plastics, with good corrosion resistance and anti-static impact resistance and excellent heat resistance, beautiful appearance and other characteristics. The product features are reliable, durable, functional and easy to customize;
4. The overall design is relatively stable explosion-proof, corrosion-proof, dust-proof and water-proof;

5. Connect the fastening screws to prevent the screws from falling out after opening the cover.

II. How to choose explosion-proof operating column

Explosion-proof operating column is the most important thing is to choose according to their real needs; the choice of materials; the choice of units.

1、Choose according to your real needs

Explosion-proof operating column model specifications are many such as: BZC LBZ LNZ and a series of different models, but the principle of control and the actual installation of wiring is similar, the user can choose according to need.

2、Selection of materials

Stainless steel three-proof corrosion-resistant grade WF2; engineering plastics, explosion-proof anti-corrosion operating column three-proof corrosion-resistant WF2, aluminum alloy, explosion-proof effect.

3、Selection of modules

This is also the most important point, many people do not know what is the unit when buying, just know that there are different models, now briefly introduced to you A: on behalf of the number of buttons; D: on behalf of the number of indicators; B: on behalf of the number of ammeter; R: on behalf of the number of potentiometers; K: on behalf of the number of changeover switches (two-position) (three-position); L: on behalf of the vertical installation; G: on behalf of the wall-mounted installation.

III. Explosion-proof operating column use and maintenance need to pay attention to aspects:

1. The basic data listed on the nameplate of the operating column should be checked for compliance with actual conditions of use before installation.
2. The explosion-proof operating column should be reliably grounded.
3. No matter what kind of wiring and what kind of installation form, the sealing ring of the introduction device must be pressed tightly to ensure its sealing performance. If the sealing ring is found to be aging during maintenance, it should be replaced in time, and other products should not be used as substitutes.
4. After wiring, it should ensure that the electrical clearance in the main cavity is not less than 5.5mm and the creepage distance is not less than 6.3mm; the electrical clearance in the wiring cavity is not less than 8mm and the creepage distance is not less than 10mm.
5. All blast surfaces should not be scratched, cleaned and coated with rust preventive oil.
6. Maintenance is strictly prohibited to open the cover with electricity to ensure safety.
7. During installation and maintenance, the explosion-isolating surfaces should be properly protected.

8, the explosion-proof operating column for maintenance, if you have to replace the components, the replaced components should be in line with the requirements of the respective standards.

IV. Explosion-proof operating column heat solution

Electrical equipment heating is the biggest potential threat to the safe operation of the equipment, if it can not be found and dealt with in a timely manner, when the heat is long or serious, it is likely to lead to equipment connection points burned off or damaged, triggering accidents.

1. Causes of heat generation in explosion-proof operating column (electrical) equipment:

When the equipment is working, due to the voltage, current, will produce resistance loss heating. Heat generation under permissible load occupies a large proportion of equipment operation faults and is one of the major faults of electrical equipment.

Heat faults can lead to thermal breakdown of the insulation of the electrical equipment, thermal deformation of the conductor connection parts, or even melt welding, which seriously threatens the safe operation of the electrical equipment. Strengthen the inspection, do a good job of electrical temperature measurement, timely detection of potential hidden dangers. Summer weather is hot, inspectors must inspect on time and do a good job of time, content, records.

Scientific and reasonable arrangements for electrical management, electrical operation, electrical maintenance personnel inspection time and inspection frequency, to minimize the inspection of the blind spot; inspectors must be conscientious and responsible for all electrical equipment and accessories to check the integrity of the situation, check the preparation of the machine is normal, pay attention to each motor, switches, cables, temperature, sound, voltage, current, whether it is normal, and the establishment of the temperature measurement records in the distribution room, each shift on the sub-pipe The temperature measurement of electrical appliances within the scope of each shift and make relevant records, and find problems should be promptly reported to deal with at each level, in order to effectively ensure the safe and stable operation of electrical appliances.

2. Do a good job of fastening and troubleshooting electrical supply connections during the summer months

Electrical connectors mainly include motor wiring, high-voltage cabinet circuit breaker up and down wiring, disconnecting the wiring at the knife gate, low-voltage cabinet switches, circuit breakers, contactors and other wiring, the fastening of these electrical connectors and the safe operation of electrical appliances are closely related. As we all know, electrical connectors are hot and cold phenomenon, due to changes in temperature will appear hot spots, fasteners loose, poor contact with the phenomenon of connectors, electrical appliances become a safe and stable operation of the “roadblock”.

3. Do a good job of cleaning the motor and power supply cabinets for sanitation.

Hot and humid weather is a threat to the stable operation of electrical appliances, electrical equipment on the accumulation of more ash, power supply lines, power supply equipment will cause electrical equipment short-circuit, creepage and discharge phenomenon; and operation of electrical equipment will result in poor heat dissipation, motor insulation aging and other occurrences. This requires us to regularly clean the accumulated dust on the power supply lines and equipment, and check and clean the dust on the motors, especially the open motors, before the coming of summer to ensure the good heat dissipation of the electrical appliances.