What Are the Principles and Advantages of High Voltage Bridge Method

What is a high voltage bridge? Designed based on the principle of Murray bridge, it is applicable to the location of breakdown points (low resistance, high resistance and flashover breakdown) of various wires and cables after laying and points without breakdown but with low insulation resistance: for example, the insulation defect points with low cable resistance but without breakdown under operating voltage are found with a megger. Of course, it can also be used to locate the defect points of various cables in the cable factory. There are two methods of cable fault location in rough measurement: electric bridge method and wave reflection method. At present, wave reflection locator is more popular. Its disadvantages are: the field wiring of some instruments is complex and there is a positioning blind area. When the waveform is not typical, the positioning personnel are required to master the instrument and be experienced to distinguish the pulse waveform. There are several cable faults that are difficult to find by wave reflection method: for example, insulation defect points of high-voltage cable sheath, steel tape armored low-pressure cable, PVC cable, no reflected wave, unable to locate. Short cable, unable to locate. Some high breakdown points cannot be broken down under impulse voltage and are difficult to locate. The high-voltage bridge cable fault tester contains a high-frequency, high-voltage and constant current source, which solves the interference problem of the power supply to the high-sensitivity amplification of the bridge. The power supply and the bridge are integrated. The measuring cable is a special high-voltage cable, which adopts the resistance measurement principle of four terminal method, with high positioning accuracy. The bridge is placed on the high voltage side and the operating button is safely grounded. The limitation of the bridge method for high resistance positioning is solved, and the characteristics of no blind area, accuracy and convenience of the bridge method can be brought into play. Murray principle in high voltage bridge: Murray in Chinese means Wheatstone, Wheatstone bridge (also known as single arm bridge). The universal Wheatstone bridge resistors R1, R2, R3 and R4 are called the four arms of the bridge. G is the galvanometer to check whether there is current in the branch where it is located. When G has no current, it is called that the bridge is balanced. When balancing, the resistance values of the four arms meet a simple relationship, which can be used to measure the resistance. When G has no current, it is said that the bridge reaches balance. When balancing, the resistance values of the four arms meet a simple relationship. Using this relationship, the resistance of Murray bridge can be measured. Advantages: 1. Murray bridge balancing method has no test blind area, which is used to judge the short cable and the breakdown point near the cable end. 2. Murray bridge method only requires the uniformity of cable phase resistance. Cables with poor traveling wave transmission characteristics, such as PVC low-voltage cables with large dielectric loss, can effectively judge the short cable and the breakdown point near the end by combining the current source with Murray bridge technology, so that steel tape armored low-pressure cables and PVC cables can have positioning and no blind area search.

What Are the Principles and Advantages of High Voltage Bridge Method 1

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5 Reasons a Voltage Detector Pen Is Good for You
A voltage detector is a quick and inexpensive method to check the presence of voltage in an AC circuit, switch or socket without actually working with it. Also known as a voltage rod, rod, sniffer or pin, a voltage detector clings to a shirt pocket and beeps or glows when it detects voltage in a conductive part of the insulation.Voltage detectors are used to repair electrical circuits, detect live neutral wires and in other situations where you need to verify the presence of electric current. These types of voltage detectors are designed for the non-contact detection of electrical circuits in residential, commercial and industrial buildings. Random contact with live electrical conductors is no problem, and the detector evaluates the voltage level in the electrical safety category for which it is used.The voltage tester Klein Tools ET40 is ideal for checking regular electrical cables, door bell sockets, lights and other devices. It has functions for displaying positive and negative DC polarity and is able to detect DC voltage currents as low as 1.5 V. In addition to detecting standard voltages and low voltages, voltage detectors and LED testers can also detect rated voltages.A good voltage tester not only saves you time, but also gives you the certainty that your electricity prices are normal. The best voltage detector pins operate in a wide voltage range and are able to provide acoustic and acoustic feedback when detecting voltage. They are small enough to be transported and provide a precise reading that tells the user whether voltage is present or not.Reinforced electronic testers (also called electrical testers, pins and voltage detectors) rely on capacitive currents to detect changes in the electric field of an energy-charged object. Non-contact voltage testers (test pins, voltage sensors, voltage testers and pins they know) are the safest way to ensure that an electrical conductor has no voltage without touching it or suffering an electric shock. They work by detecting changes in an electric field surrounding an object conducting alternating or alternating current.Non-contact testers allow you to check the voltage of a wire or device without having to touch the wire or part. A voltage tester can be used to test the presence of voltage when a multimeter cannot detect it and to measure and display the exact amount of available voltage. These testers are designed to detect the main voltage and do not provide any indication of low voltage control circuits used in the bells or HVAC controls.A further limitation is that DC voltage can not be detected with this method because DC currents do not flow in a uniform state through capacitors and non-contact testers that detect electrical fields cannot be activated. You cannot detect voltage through shielded or armoured cables, and this is a basic limitation due to the Faraday cage effect. A TONG or AMmeter detects changes in magnetic fields, while a detector uses current flowing through the wire in question, and it senses alternating electric fields emitted by AC conductors.Given the variety of products in the contactless voltage tester category, you can expect different types of NCVTs, but you can imagine that there are more contactless DC voltage testers and contactless DC voltage testers than there are regular DC testers on the market. Remember to use a quality insulation resistance tester when you need to measure the insulation around your circuit. You want a non-contact voltage tester that comes with a hook so that you can put it in your shirt pocket.I call it the voltage sniffer, but the technical name for it is the capacitive voltage sensor. It is supplied with an alligator clip, which is interchangeable with test cables, and a holster to keep it handy. It uses black magic to determine whether wires are live or not, and it is 100% reliable at all times.
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