FAQ

Electricians are indispensable in any business or institution. Electricians can accurately and timely determine faults in the power system, which requires electricians to be very familiar with circuit maintenance knowledge and be able to flexibly handle problems according to specific situations. In fact, faults in the power system mainly include daily maintenance and inspection, whether the line debugging is normal, whether the installed equipment and wires are reasonable, etc. Electricians can determine whether the power system is healthy and normal by observing whether the zero-degree stability of the lighting lamp is normal. Under normal circumstances, unreasonable debugging and installation may cause abnormal lighting fixtures. Common phenomena include short circuit, open circuit, etc., and even serious leakage. Therefore, electricians must be able to accurately analyze the root causes of power system failures and then take effective measures to solve them. In addition, transformer failures are also very common. If the transformer is used for a long time, insulation, overheating and other phenomena will occur. Therefore, power personnel should pay attention and check the transformer frequently. Installing insulating porcelain pipes and oil protection can effectively avoid failures.

1. Observation method By observing electrical fault phenomena, the fault location can be quickly and accurately determined. For example, observe whether there are sparks, abnormal sounds, smoke, etc. in electrical equipment; observe whether the fuse is blown and whether the wire color is normal, etc. The location and cause of the fault can be preliminarily determined through observation. 2. Replacement method When a component or component is suspected to be faulty, the replacement method can be used for inspection. Replace the suspected faulty component or component with a new one of the same model. If the circuit returns to normal operation after replacement, you can determine that the original element or component is faulty. 3. Step-by-step queuing method When multiple branches in a circuit are connected in parallel or in series, if one of the branches fails, the entire circuit will not work properly. In this case, you can gradually disconnect each branch and observe whether the circuit returns to normal operation after each branch is disconnected. After finding the faulty branch, check the components or components in the branch step by step. 4. Comparison method Compare the faulty circuit with the normal circuit to determine the fault location. By comparing the voltage, current, resistance and other parameters of the two circuits, the cause of the fault can be found. 5. Debugging method For some adjustable circuits, the cause of the fault can be found through debugging. For example, for some circuits that need to adjust components such as resistors and capacitors, the working status of the circuit can be observed by adjusting the parameters of these components to find out the cause of the fault.

Electricians must have professional knowledge and sufficient theoretical principles as a basis to ensure that faults can be judged and analyzed immediately and accurately. The following introduces several commonly used power system troubleshooting methods. 1. Resistance testing method Resistance testing method is a commonly used measurement method. It usually refers to a method of using the resistance range of a multimeter to measure whether the motor, lines, contacts, etc. meet the nominal value and whether they are connected and disconnected, or using a megohmmeter to measure the insulation resistance between phases and between phases and ground. When measuring, pay attention to the range used and the accuracy of the calibration table. Generally speaking, when using the resistance method to measure, the general approach is to use the low range first. At the same time, pay attention to whether there is a loop in the line under test, and power-on measurement is strictly prohibited. 2. Voltage testing method Voltage testing method refers to a method that uses the corresponding voltage range of a multimeter to measure the voltage value in a circuit. Usually when measuring, sometimes the voltage of the power supply and load is measured, and sometimes the open circuit voltage is measured to determine whether the line is normal. When measuring, you should pay attention to the gear of the instrument and choose the appropriate range. Under normal circumstances, when measuring unknown AC voltage or open circuit voltage, the highest voltage level is usually selected to ensure that it does not work at high voltage and low range to avoid damaging the meter; at the same time, when measuring DC, pay attention to the positive and negative polarities. 3. Current testing method Current testing method is usually a method to determine the cause of the fault by measuring whether the current in the circuit meets the normal value. For weak current circuits, the current range of an ammeter or multimeter is usually connected in series in the circuit for measurement; for high current circuits, a clamp ammeter is usually used for detection. 4. The instrument detection method uses various instruments to measure various parameters, such as using an oscilloscope to observe changes in waveforms and parameters to analyze the cause of the fault. It is mostly used for weak current lines. 5. The conventional inspection method relies on human sense organs (such as: some electrical equipment has burnt smell, sparks, discharge, etc.) and uses some simple instruments (such as: multimeter) to find the cause of the fault. This method is the most commonly used in repairs and is also the earliest method used. 6. Replacement of original parts: When it is suspected that a certain device or circuit board is faulty but cannot be confirmed and replacement parts are available, the parts can be replaced and tested to see if the fault disappears and returns to normal. 7. Direct inspection method: When the cause of the fault is understood or the fault location is determined based on experience, the suspected fault point can be directly inspected. 8. Step-by-step troubleshooting method: If a short-circuit fault occurs, you can gradually cut off part of the line to determine the fault scope and fault point. 9. Parameter adjustment method: In some cases, when a fault occurs, the components in the line are not necessarily bad, and the line contact is also good. It's just that some physical quantities are improperly adjusted or run for a long time. It may be that external factors cause system parameters to change, or system values ​​cannot be automatically corrected, causing the system to fail to work properly. At this time, adjustments should be made according to the specific conditions of the equipment. 10. Principle analysis method: According to the schematic diagram of the control system, by tracking the signals related to the fault, analyze and judge, find the fault point, and find out the cause of the fault. Using this method requires maintenance personnel to have a clear understanding of the working principles of the entire system and unit circuits. 11. Comparison, analysis and judgment method It is based on the working principle of the system, the action procedures of each control link and the logical relationship between them, combined with the fault phenomenon, to compare, analyze and judge, reduce the measurement and inspection links, and quickly determine the scope of the fault. The above common methods can be used alone or in combination. When encountering actual electrical faults, it should be used flexibly based on the specific situation.

There are many reasons for circuit failure, but they can usually be summarized as the following points: 1. Short circuit: When a short circuit occurs in a circuit, the current does not pass through the load or passes through the load but the current is too large, causing the fuse in the circuit to blow or trip, and even cause a fire in severe cases. 2. Open circuit: When a circuit is open, current cannot flow, causing the circuit to not work properly. The cause of an open circuit may be a broken line, poor contact, or load failure. 3. Leakage: Leakage refers to the current leakage in the circuit, usually due to aging of the line, poor insulation or load leakage. Electric leakage not only causes energy waste, but also poses a threat to equipment and personal safety. 4. Overload: When the load in the circuit is too large, it will cause excessive current, causing the fuse to blow or trip, and even cause a fire in severe cases.

1. Observation and inspection: First, carefully observe the circuit for any obvious signs of damage, burnt out or looseness. Check whether plugs, sockets, switches and other connecting parts are normal. 2. Safety first: Before performing any operation, make sure the power supply has been cut off to avoid electric shock accidents. 3. Tool preparation: Prepare appropriate tools, such as pens, multimeters, etc., for further testing. 4. Sectional inspection Divide the circuit into multiple parts and check the conductivity of each part step by step. You can determine if a circuit is clear by measuring resistance or using a continuity tester. 5. Look for shorts and opens. A short circuit will cause excessive current flow, while an open circuit will prevent the circuit from conducting. These problems can be detected using a multimeter or oscilloscope. 6. Check components Check whether fuses, relays, capacitors and other electrical components are working properly. If damaged, it should be replaced in time. 7. Cleaning and Maintenance Clean electrical equipment and circuits regularly to prevent dust, moisture and other factors from affecting the circuits. 8. Professional help If the problem is complex or you cannot solve it yourself, do not hesitate to seek help from a professional electrical engineer in time.

The main function of the cable transfer box is to complete the collection and tapping of cable lines in the power distribution system, and to implement tapping, branching, connection and conversion circuits for the cable lines. The cable junction box is a special electrical connection device in the power system. It does not have secondary auxiliary configurations such as control and measurement, but it can complete the basic connection function of the cable line. This kind of equipment is usually used in commercial centers, industrial parks, urban residential areas and other places. It has the properties of fully insulated, fully enclosed, corrosion-resistant, maintenance-free, safe and reliable. Cable tap boxes can be divided into ordinary tap boxes and advanced tap boxes. Ordinary tap boxes do not have switching equipment and are suitable for tapping or branch wiring, while advanced tap boxes may have more functions and configurations.

(1). Air insulation type with heat shrinkable material as the main material. This product is an early product and has been eliminated. (2). Protective cable branch box with rubber and plastic sheath as the main material. In long-term operation, internal interface separation and exposed end cracking are prone to occur, causing insulation and sealing damage, so the development of this product is limited. (3) Cable joint sealed cable branch box with ethylene propylene diene rubber (EPDM) as the main material. The material is hard, and EPDM rubber is combustible, making it easy to climb or burn due to arcing. At the same time, its moisture-proof, waterproof and aging-resistant properties are also weak, and it cannot meet the requirements for long-term maintenance-free operation. EPDM is a toxic substance and has adverse effects on environmental protection. (4), Electric plug-in cable connector type cable branch box. Our country's power supply system is powered by a three-phase transformer. It is impossible to unplug and plug in while the power is on. Such unplugging and plugging will cause a serious deviation of the neutral point and form a two-phase power supply in a short time. In serious cases, it will cause a large-scale power outage and bring unnecessary economic losses to the power supply and equipment. (5), Silicone rubber-based material cable joint flood-proof cable branch box. The material is soft, highly elastic, high-density, fully insulating, and has good material sealing performance. Because the silicone rubber and the cable adopt an interference fit, the radial shrinkage is highly uniform and will not cause internal creepage breakdown due to thermal expansion and cold contraction that separate the internal interfaces. At the same time, the cable body has long-term radial pressure, making the internal interfaces tightly and reliably combined. At the same time, silicone rubber is essentially a harmless material and is also beneficial to environmental protection. (6), Isolated cable branch box with SF6 load switch. Because this product can realize the functions of a ring main unit and is cheaper than a ring main unit, it can play an important role in replacing switch stations outdoors. It also facilitates maintenance, testing and overhaul of branch lines, reducing power outages and economic losses. Especially when the construction of line corridors and power distribution rooms is difficult, its superiority is even more evident.

At present, there are many types of 10kV outdoor cable branch boxes produced in my country. Therefore, the installation and construction of 10kV cable branch boxes has become very important. Whether the operation method is correct during the installation and connection of the cable branch box and the cable joint, whether the cable head installation process is familiar with the combination sequence of the internal components of the cable branch box and the cable joint components, whether the operation is carried out in accordance with the installation specification manual provided by the manufacturer, etc., will directly affect the service life and normal operation of the cable branch box.

In modern society, with the rapid development of science and technology, smart home devices have gradually become a part of family life. As one of them, smart water meters and smart electricity meters have begun to enter thousands of households due to their high efficiency and convenience. However, when it comes to installing smart meters at home, everyone’s reaction is very different. Some looked happy, some looked sad, and some even seemed indifferent. So what exactly causes this difference in expression? This article will focus on this topic. First of all, people's different acceptance of new technologies is an important reason for the differences in expressions. For those who are keen on pursuing new things and are curious about technology, installing smart water and electricity meters is undoubtedly exciting news. They look forward to realizing smarter and more automated home life and improving the quality of life through smart water and electricity meters. In contrast, installing smart water and electricity meters may cause concern for those who are conservative about new technologies. They may be concerned about smart meter security, privacy protection issues, or feel uncomfortable operating new technologies. Secondly, economic factors are also an important factor affecting people's expression. Through precise metering and data analysis, smart meters often help households save energy and reduce utility costs. This is undoubtedly good news for those budget-conscious and frugal families. However, for those households with financial constraints, they may be worried about the installation and maintenance costs of smart meters, and the additional expenses that come with it. Also, when they hear that smart meters are to be installed, their brows will wrinkle slightly, and their hearts will be filled with all kinds of questions and worries: Will it affect the normal use of home appliances? Will remote speed adjustment be possible after installation, increasing the risk of living costs? They may feel that they are accustomed to traditional water and electricity meters and are not interested in or even skeptical of new technologies. For them, accepting smart meter changes may require more time and understanding.

Meter reading solutions: Smart meter reading solutions are divided into two types: wired and wireless, each with its own advantages and disadvantages. Wired solutions, such as the RS485 meter reading solution, are suitable for situations where electricity meters are centrally installed; wireless solutions, such as the NB-IOT meter reading solution, are suitable for situations where owners are dispersed and remote. Market evaluation: Based on market evaluation and user feedback, you can understand the actual usage of the product. Price and cost performance: Price and cost performance are also factors that cannot be ignored. Products with high cost performance should be selected based on actual needs

Smart meters can cut off power in several ways: Manual power off: Find the meter's protector and pull it down to manually cut off the power. If there is no display on the meter after the operation, it means the power-off operation was successful. If there is still a display, it may indicate that the protector is damaged, and you should contact a professional for repair. Software control: The software system built into the smart meter can monitor power consumption in real time and automatically cut off the power when power consumption exceeds the set threshold to avoid waste. Remote control: Exchange data with external devices through the communication interface to achieve remote control. For example, smart meters can transmit power usage data to the power company's server. When power usage exceeds a set threshold, the server will automatically issue instructions to cut off the power supply. Relay control: There is a relay integrated inside the smart meter, and power outage control can be achieved by controlling the relay. When the power consumption exceeds the set threshold, the smart meter will automatically control the relay to cut off the power supply. Manual operation of the protector: Each meter has a leakage protector, and the power supply can be cut off by pulling the protector. If there is no protector or the protector is damaged, contact a professional for repair. These methods provide flexible power management options that can be operated manually or automatically controlled through technology and software to meet different power management needs

Use a plum blossom key to open: There will be a locking hole on the outside of the meter box cover. You need to choose a plum blossom key of the same caliber to open it. Insert the key into the lockhole and turn it clockwise to open. Use the smart unlocking function: Some smart meter boxes have an automatic code scanning and unlocking function. You can use your mobile phone to scan the QR code to unlock without a key. Notes and Possible Alternatives Notes: Be careful when operating to avoid damaging the meter box or meter. Alternative method: If you forget to bring your key, you can try to use the smart unlock function or contact the power supply company for help.

To prevent the smart meter box from tripping, the following measures can be taken: Plan electricity consumption rationally and arrange the electricity load reasonably according to the rated capacity of the meter to avoid overloading. Check the circuit regularly, including checking whether the wires are aged or damaged, and ensure that the power supply lines are not overloaded. Especially for high-power electrical appliances, separate circuits should be used to avoid circuit overloading. Use smart meters such as Schwann Smart Meter to check the electricity consumption data in the house in real time. When abnormal electricity consumption, illegal electricity consumption, or exceeding the preset electricity consumption limit are found, early warning prompts will be issued through the smart landlord software to ensure safe electricity use. Install a leakage protector to detect leakage in time and cut off the power supply when leakage occurs to protect personal safety and circuit equipment. Pay attention to the usage habits of electrical appliances, learn to use electrical appliances rationally, do not add electrical equipment at will, do not modify circuits without authorization, pay attention to the instructions for using electrical appliances, and avoid using electrical appliances that do not match the power supply. Regular inspection and maintenance of circuits by professionals, including insulation inspection of wires to prevent aging or breakage. Through the above measures, we can effectively prevent smart meter boxes from tripping, ensure the safe use of household appliances, and protect personal safety and circuit equipment at the same time.

Basic operations for tripping and resetting smart meter boxes Basic operations for tripping and resetting smart meter boxes are relatively simple. First, find the reset button on the meter box. It is usually a small square button in black, white or other colors. Pressing the button and then pushing the switch up usually results in a successful reset. Problems you may encounter during the reset process and their solutions The meter trips but does not push up If the meter trips but does not push up, it may be because there is a leakage protector in your home. In this case, you need to press the button of the leakage protector first, and then press the main switch. Sometimes the meter trips because of a problem with the wiring, so you need to contact the property electrician or call the electric service hotline for help. Insufficient balance in the meter If the meter trips due to insufficient balance, you need to purchase electricity to restore power. Circuit failure If there is a short circuit problem in the circuit, you need to disconnect the faulty electrical appliance, check whether the wire is damaged or have poor contact, and repair it before resetting it.