An electrical bridge is an element in an electrical system that acts as a connection or separation between various circuits or branches of a circuit. It is a key element in electrical installations that allows you to control the flow of electricity and manage various aspects of the electrical system. How to accurately calculate resistance using an electric bridge? What are the different types of these elements? We discuss these and other issues related to electric bridges in a new article.
Check out electric bridges at the Onninen wholesaler
How does an electric bridge work?
Electrical bridges are elements often used in electronics and electricity. Their basic application is to measure resistance, inductance and capacity of linear elements. Their operation is based on the phenomenon of balancing the resistance of the bridge branches at a specific frequency of the supply voltage.
There are various types of electrical bridges available on the market. The most important of them are Wien's bridge, Schering's bridge, Maxwell's bridge, Kelvin's bridge, Graetz's bridge and Boucherot's bridge. Individual types differ in design and application. Each of them is designed to meet specific requirements - depending on the type and specificity of the elements that are to be tested.
Types of electric bridges
As we have already mentioned, there are many types of electrical bridges , each of which has its own application in different types of measurements. One of the most commonly used types of bridges is the rectifier bridge, used to measure resistance. It consists of four resistors that allow you to calculate the resistance values in the bridge branch. The rectifier bridge is used primarily for measuring linear elements.
Another type of bridge is the three-phase bridge. It is composed of three Wagner branches and is mainly used to measure resistance at high alternating voltages. Thanks to its design, the three-phase bridge allows for accurate determination of the resistance of elements with significant frequency changes.
The Kelvin bridge, in turn, is a measurement system used especially for accurate measurement of resistance at low values. Its operation is based on the use of a four-way switch. This element allows you to minimize the impact of connection resistance on measurement results.
The Schering bridge is a device used to measure the capacity of capacitors. It works by comparing the capacitance of the capacitor with a reference capacitor. This allows for accurate determination of the capacitance value.
A Wien bridge is a tool used to measure the resistance, inductance and capacity of electrical components. It is a type of balanced bridge that allows accurate measurements at different AC voltage frequencies.
How to calculate resistance using an electric bridge?
The process of calculating resistance using an electric bridge involves finding the balance point at which the sum of the voltages and currents in the branches of the bridge is equal to zero. Using a system of equations that describes the equilibrium state, it is possible to calculate the resistance of the elements that are located in the branch of the bridge.
The specific method varies depending on the type of brisket. For example, in the case of a Kelvin Bridge, the resistance of an unknown resistor can be determined using a balanced circuit by measuring the voltages and currents in various branches of the bridge. For the Schering Bridge, this process, in turn, involves measuring the capacitance of the capacitor.
Electric bridges at the Onninen wholesaler
The quality of electrical bridges greatly affects the precision of measurements and, therefore, the operation of the designed or serviced systems. Realizing their importance, at the Onninen electrical wholesaler we offer only well-tested elements from renowned brands.
Our offer includes, among others: EATON BPZ-BR/SASY/MSW/H-2/1200 electric bus bridge . This two-speed design offers a maximum rated current of 400 A. However, the EATON BPZ-KB-24/250 Electric Bridge supports 4 phases and a maximum rated current of 250 A.
Due to the availability of different types and their ability to accurately measure resistance, inductance and capacitance, bridges are widely used in electrical and electronics. Understanding the principles of operation of individual types of bridges will allow you to precisely calculate the resistance of the bridge branches and effectively use this knowledge in practice.