ഉൽപ്പന്ന ലിസ്റ്റ്
ഞങ്ങളെ സമീപിക്കുക
ഇമെയിൽ:qiao@hvtest.cc
മൊബൈൽ:+8615871365102
എന്താണ് ആപ്പ്:+8615871365102
-
Causes of cable faults
2024-08-22The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.The causes of cable faults can be summarized into multiple aspects, and the following are some of the main reasons and their detailed explanations:Mechanical damage:Damage during installation: Accidentally damaging the cable during installation, pulling the cable due to excessive mechanical traction, or excessively bending and damaging the cable.Direct external damage: Construction activities on or near the cable path, such as excavation, pile driving, etc., may cause direct external damage to the cable.Vibration or impact load of driving vehicles: may cause lead (aluminum) sheath cracking of underground cables.Damage caused by natural phenomena, such as tension caused by land subsidence, may break intermediate joints or conductors.Insulation moisture:The structure of the junction box or terminal box is not sealed or poorly installed, resulting in water ingress.Poor cable ma
കൂടുതൽ -
Cable failure caused by insulation moisture
2024-08-22The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.Cable faults caused by insulation moisture are one of the common types of faults in cable operation, accounting for about 13% of the total number of cable faults. The following is a detailed summary of the main causes and related information of cable failures caused by insulation moisture:Poor or failed sealing:One of the main causes of insulation moisture is inadequate or ineffective sealing at the middle or terminal of the cable. Poor sealing causes moisture to enter the interior of the cable, reducing insulation resistance and increasing leakage current.Poor manufacturing processes or material defects in cable manufacturing, such as holes or cracks in the outer protective layer of the cable, can also increase the risk of moisture intrusion.Cable operating environment:During the laying and operation of cables, they may cross roads, bridges, culverts, etc. Due to weather or
കൂടുതൽ -
What are the preventive measures for insulation moisture
2024-08-21The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.The preventive measures for insulation moisture can be expressed and summarized as follows:Improve cable sealing performance:Ensure good sealing performance of cable heads, terminal heads, and intermediate joints during the installation and manufacturing process of cables. Use high-quality sealing materials and sealing processes to prevent moisture from entering the interior of the cable.For the damage of the outer sheath and steel armor of the cable, it should be repaired in a timely manner to prevent moisture from entering the cable from the damaged area.Optimize the cable operating environment:Ensure that cable trenches, cable wells, and cable channels are dry and avoid water accumulation. Regularly inspect the drainage system of the cable trench to ensure it is unobstructed.For outdoor cables, it is possible to consider using cable supports to elevate and secure the cabl
കൂടുതൽ -
Principle of surface tension testing
2024-08-21The surface tension tester under the UHV power company can help many power workers conduct various power tests more conveniently.The principle of surface tension testing is mainly to measure the tension on the surface of a liquid, in order to understand the surface properties and quality of the liquid. The following is a detailed explanation of the principle of surface tension testing:1、 Basic concepts of surface tensionSurface tension is the interaction force between liquid molecules, manifested as the phenomenon of liquid forming a thin film on the surface. This force causes the liquid surface to have a tendency to shrink to the minimum area. The size of surface tension determines the dispersion, wetting, adhesion, foam, penetration, gelling and other characteristics of various liquid substances.2、 The main principle of surface tension testingThe principle of surface tension testing is to determine the surface properties and quality of a liquid by measuring its surface tension. Commo
കൂടുതൽ -
What is a surface tension testing instrument
2024-08-20The surface tension tester under the UHV power company can help many power workers conduct various power tests more conveniently.Surface tension testing equipment is a specialized device used to measure the surface tension of liquids, which can help us understand the surface properties and quality of liquids. The following is a detailed explanation of the surface tension testing instrument:1、 DefinitionA surface tension testing instrument is a device that uses physical or chemical methods to measure the surface tension of liquids. It can accurately measure the magnitude of liquid surface tension, providing effective data support for liquid applications, production, quality control, and other aspects.2、 PrincipleThe surface tension testing instrument mainly uses principles such as equilibrium method, maximum reduction angle method, and dynamic method for testing. Among them, the balance method is the most basic testing method, which suspends a weighing rod or ring on the surface of the
കൂടുതൽ -
How to avoid the occurrence of single-phase grounding faults
2024-08-20The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.To avoid the occurrence of single-phase grounding faults, the following measures can be taken, combined with the relevant information in the reference article for point-to-point representation and summarization:1、 Regular inspections and checksDistance between wires and obstacles: Regularly check the distance between wires and trees or buildings to ensure compliance with safety standards and avoid single-phase grounding faults caused by wire breakage or short circuiting of trees.Equipment status: Check if there is a bird's nest at the top of the pole, if the binding or fixation of the wire in the insulator is firm, if the insulator fixing bolts, cross arms, and tension bolts are loose, if the wire is broken or stranded, if the wire sag is too large or too small, etc.2、 Insulation testing and equipment maintenanceInsulation testing: Insulators, branch fuses, lightning arr
കൂടുതൽ -
How to determine the occurrence of single-phase grounding fault
2024-08-19The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.To determine the occurrence of a single-phase grounding fault, the following methods and steps can be used, which integrate relevant information and descriptions from the reference article:1、 Observe voltage changesVoltage drop of faulty phase: When a single-phase grounding fault occurs, the voltage of the faulty phase will drop to near zero. For example, if phase A is completely grounded, the voltage of phase A will drop to zero.Non fault phase voltage rise: At the same time, the voltage of the non fault phase will rise to the line voltage. This is because in a low current grounding system, when one phase is grounded, the neutral point potential will shift, causing the non fault phase voltage to rise.2、 Utilize the voltage at the triangular opening of the voltage transformerVoltage at the open triangle of the voltage transformer: When a single-phase grounding fault occurs,
കൂടുതൽ -
What are the application scenarios of series resonance in electronic circuits
2024-08-19The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.Series resonance has various application scenarios in electronic circuits. Here are some specific examples and related digital information:Communication and Broadcasting System:Signal selection and filtering: In the process of signal transmission such as communication, broadcasting, and television, signals are often affected by various interferences and noise. Series resonant circuits can amplify signals of specific frequencies while suppressing signals of other frequencies, thereby achieving signal selection and filtering. For example, in a radio, the quality of the received signal can be improved by adjusting the parameters of the series resonant circuit.Tuning circuit: The tuning circuit in a radio uses the principle of series resonance to select the radio signal and achieve the reception of the radio signal.Power system:AC voltage withstand test: Using series resonance to
കൂടുതൽ -
What surface tension tester can measure the surface tension of substances
2024-08-16The surface tension tester under the UHV power company can help many power workers conduct various power tests more conveniently.The surface tension tester is a high-precision instrument, which is mainly used to measure the surface tension of liquid, gel system and solid. The following is a detailed explanation of its measurement range:Liquid:The surface tension measurement range is wide, generally reaching 1-1000 mN/m, and even in some high-end models, as described in reference article 4, it can reach 1-2000 mN/m.Suitable for various types of liquids, including water, solutions, detergents, dishwashers, etc. Especially for liquids with large volume and low surface tension, surface tension meters can provide more accurate measurements.In industrial applications, such as pharmaceutical, beverage, food processing and other industries, surface tension meters can be used to control product quality, such as optimizing the mixing state by measuring the surface tension of mixed powder, or avo
കൂടുതൽ -
What is the principle of surface tension tester
2024-08-16The surface tension tester under the ultra-high voltage power company can help many power workers conduct various power tests more conveniently.The principle of the surface tension tester is mainly based on several different methods, all of which are used to measure the surface tension of liquids. The following are detailed introductions to several common principles and methods:Principle of Balance Method:Principle description: By hanging a weighing rod or ring on the surface of the tested liquid and measuring the relationship between the force generated by the rod or ring on the liquid surface and its weight, the surface tension can be calculated.Specific operation: Select a suitable test rod or ring and hang it on the surface of the tested liquid. Adjust the controller to ensure that the test rod or ring is in a balanced state. At this point, the balance between the force generated by the test rod or ring on the liquid surface and its weight can reflect the magnitude of the surface t
കൂടുതൽ -
What are the common causes of cable faults
2024-08-15The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.There are many common causes of cable failures, and the following are some of the main reasons:Cable aging: During long-term use, the insulation material of cables will be affected by various factors such as heat, electricity, machinery, and chemistry, leading to a gradual decline in insulation performance and ultimately causing faults. This aging may manifest as phenomena such as insulation layer becoming brittle, cracking, and peeling off.External force damage: During the laying, installation, and use of cables, they may be subjected to mechanical external forces (such as compression, impact, tension, etc.), resulting in damage to the cable insulation layer, exposed conductors, or breakage. In addition, improper operations during the construction process, such as excessive bending, sharp object scratches, etc., may also cause cable damage.Overvoltage or overcurrent: When t
കൂടുതൽ -
How to prevent cable faults from occurring
2024-08-15The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more convenientlyPreventing cable failures is a crucial step in ensuring the stable operation of the power system. Here are some specific methods and measures to prevent cable failures, expressed and summarized in clear points:1. Cable selection and material controlChoose high-quality cables: Ensure that cable materials comply with national standards and industry specifications, and avoid using inferior cables.Strictly inspect cable quality: Conduct strict factory inspection and arrival acceptance of cables to ensure that cable quality meets design requirements.2. Cable design and constructionOptimize cable design: Based on the usage environment and load characteristics of the cable, design the cable's cross-sectional area, insulation material, and structure reasonably.Standardized construction and installation: Follow the cable construction and installation specifications to avoid cable
കൂടുതൽ -
What is the resonance state of series resonance
2024-08-14The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.The resonance state of series resonance is a specific operating state in a circuit or mechanical system, characterized by the following aspects:definition:The resonance state of series resonance refers to a state in which multiple components or systems are connected together in a circuit or mechanical system, and due to their interaction with each other, the entire system exhibits a resonance phenomenon at a specific frequency or frequency range.Condition:In a circuit, when the impedance of the capacitor and inductor is equal, the resonant frequency of the circuit will appear at this specific frequency. This usually means that the values of capacitance and inductance, as well as the resistance value in the circuit, need to satisfy a certain relationship so that at a certain frequency, the impedance of the circuit reaches its minimum, thereby triggering resonance.characteristic
കൂടുതൽ -
Method for determining cable faults
2024-08-14The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.The method for determining cable faults is a systematic process aimed at quickly and accurately locating and identifying the fault points in the cable system. The following are several main judgment methods, and they will be explained in detail with relevant information:Visual inspection method:Method: Check the appearance and insulation layer of the cable through human vision and touch, and observe whether there is any damage, deformation, burning, or other phenomena.Features: Simple and easy to implement, able to quickly and preliminarily determine whether there is a fault in the cable.Voltage test:Method: Use a voltmeter or multimeter to measure the voltage at both ends of the wire and determine if there is an open circuit fault.Attention: Ensure the accuracy and reliability of the testing equipment to avoid misjudgment.Insulation test:Method: Use an insulation resistance
കൂടുതൽ -
Which is more accurate, pulse reflection method or acoustic measurement method
2024-08-13The cable fault tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.Pulse reflection method and acoustic measurement method are commonly used methods for cable fault diagnosis, but in terms of accuracy, both have their own characteristics and need to be selected according to specific situations.Firstly, let's take a look at the pulse reflection method:Pulse reflection methodPrinciple: Pulse reflection method, also known as low-voltage pulse reflection method, is a fault finding method based on the propagation characteristics of electromagnetic waves in cables. It sends low-voltage pulse signals into the cable, and when the pulse signal encounters a fault point, reflection occurs, and the reflected signal is received and recorded. By analyzing the time delay and waveform characteristics of the reflected signal, the distance between the fault point and the test point can be accurately calculated.characteristic:Efficiency: The pulse reflect
കൂടുതൽ -
Under what circumstances is series resonance more suitable for use
2024-08-13The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.Series resonance is more suitable for the following situations:Resonant frequency requirement:When a circuit needs to achieve efficient energy transfer or signal processing at a specific frequency, a series resonant circuit is an ideal choice. This is because the series resonant circuit has an extremely low impedance at the resonant frequency, allowing the current to reach its maximum value at that frequency, thereby achieving efficient energy transfer.For example, in wireless communication, in order to select and amplify signals at specific frequencies, a series resonant circuit can be used to match the resonant frequency of the receiver, thereby improving the quality of the received signal.High precision requirements:Series resonant circuits have good frequency selectivity and can achieve precise processing of specific frequency signals. In situations where high-precision me
കൂടുതൽ -
Series resonance condition
2024-08-12The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.The series resonance conditions can be summarized into the following key points:Component connection sequence:Inductance, capacitance, and resistance components must be connected in a certain order. Generally speaking, inductors are located before capacitors in circuits, while capacitors are located before resistors. This arrangement of connection sequence plays a crucial role in the resonance characteristics of the circuit.Component value selection:At the resonant frequency, the impedance of the inductive and capacitive components is equal and matches the impedance of the resistive component. This matching relationship ensures that the circuit can achieve maximum amplitude in resonance state.Frequency condition:The resonant frequency (f) is related to the inductance (L) and capacitance (C), and satisfies the following relationship: f=1/(2 π√ (LC)). Among them, f is the resona
കൂടുതൽ -
Application scenarios of series resonance and parallel resonance
2024-08-12The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.Series resonance and parallel resonance have a wide range of applications in the fields of electronics and engineering. The following are their respective application scenarios:Application scenarios of series resonanceIn the field of communication:Antenna design: Series resonant circuits can be used to design and optimize antennas to improve the transmission efficiency and range of wireless signals. For example, in wireless communication, by adjusting the connection between the antenna and the resonant circuit, the antenna can achieve the best radiation effect at a specific frequency.Filter design: Series resonant circuits can be used to design filters that selectively transmit signals within a specific frequency range to meet the needs of different communication systems.Audio equipment:Output matching network: In audio amplifiers, a series resonant circuit is used to design a
കൂടുതൽ -
What is the difference between inductance and capacitance
2024-08-09The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.The difference between inductance and capacitance is mainly reflected in the following aspects:Definition and Structure:Inductance: Inductance refers to the alternating magnetic flux generated inside and around a conductor when current passes through it, and the phenomenon in which this changing magnetic flux in turn generates induced electromotive force in the conductor. Inductance is composed of wires wound around magnetic materials, and when current passes through the wires, a magnetic field is generated.Capacitor: Capacitor is the ability to accommodate an electric field, and any electrostatic field is composed of many capacitors. A capacitor is composed of two electrical conductors that are close to each other and filled with an insulating medium, forming a capacitor as a whole.Function and Application:Inductance: Inductance can convert circuits into magnetic energy and r
കൂടുതൽ -
What are the similarities between inductors and capacitors
2024-08-09The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.The commonalities between inductance and capacitance can be summarized as follows:Energy storage:Inductance: Inductors can convert electrical energy into magnetic energy and store it. When current passes through an inductor, a magnetic field is generated around it. When the current changes, this magnetic field also changes, thereby generating induced electromotive force and hindering the change of current. This characteristic enables inductors to store energy.Capacitor: Capacitor is the ability to accommodate an electric field. When a voltage is applied between the two plates of a capacitor, the capacitor stores charge and energy in the form of an electric field.Obstructing current changes:Inductance: Inductance impedes the change of current, that is, when the current attempts to change its magnitude, the inductance will generate an electromotive force in the opposite directio
കൂടുതൽ
