Elreha electrical components Germany Elreha models Elreha prices

Elreha electrical components refer to switching devices capable of closing, carrying, and breaking current under normal circuit conditions, and closing, carrying, and breaking current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage and low-voltage types based on their application range. The boundary between high and low voltage is somewhat ambiguous; generally, equipment above 3kV is referred to as high-voltage electrical apparatus. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. They automatically interrupt the circuit when severe faults such as overload, short circuit, or undervoltage occur. Their function is equivalent to a combination of fuse-switches and over/under thermal relays. Moreover, component replacement is generally not required after interrupting fault currents. They have been widely applied. In the generation, transmission, and use of electricity, power distribution is an extremely important link. Distribution systems include transformers and various high- and low-voltage electrical equipment, with low-voltage circuit breakers being a widely used type of electrical apparatus.

Elreha electrical component characteristics

Operating characteristics: The main characteristics defining synchronous generator performance are no-load characteristics and load operating characteristics. These characteristics are important bases for users when selecting generators. No-load characteristic: When the generator is not connected to a load, the armature current is zero, which is called no-load operation. Armature reaction: When the generator is connected to a symmetrical load, the three-phase current in the armature winding produces another rotating magnetic field, known as the armature reaction magnetic field. Its speed is exactly equal to the rotor speed, and both rotate synchronously. The armature reaction magnetic field of a synchronous generator and the rotor excitation magnetic field can both be approximated as distributed according to a sinusoidal law. The spatial phase difference between them depends on the time phase difference between the no-load electromotive force E3 and the armature current I. The armature reaction magnetic field is also related to the load condition. When the generator load is inductive, the armature reaction magnetic field has a demagnetizing effect, causing the generator voltage to drop; when the load is capacitive, the armature reaction magnetic field has a magnetizing effect, causing the generator output voltage to rise. Load operating characteristics: These mainly refer to external characteristics and regulation characteristics. The external characteristic is the relationship between the generator terminal voltage U and the load current I when the speed is at the rated value, and the excitation current and load power factor are constant. The regulation characteristic is the relationship between the excitation current If and the load current I when the speed and terminal voltage are at rated values, and the load power factor is constant.

Elreha electrical component functions

The starter solenoid switch is a key component of the starter motor, and its design quality directly affects the reliability of the starter. The starter solenoid switch has two functions: one is to connect the main circuit to make the starter rotate, and the other is to push out the drive gear via a fork to engage with the engine flywheel ring gear. Therefore, the solenoid switch is required to have corresponding suction force, corresponding stroke, and contacts that can reliably switch large currents. Additionally, it is required to minimize volume and weight as much as possible. Based on these characteristics, the contact structure of solenoid switches generally adopts a contact form, i.e., moving contacts are made into bridge or disk shapes to provide larger heat dissipation surfaces and thermal capacity. The magnetic system mostly adopts a solenoid electromagnet structure to meet the requirements of corresponding stroke, corresponding suction force, small volume, and light weight. The moving iron core of the solenoid switch can move smoothly within a brass bushing equipped with a solenoid coil. The moving iron core pull rod is connected to the fork unidirectional clutch. Under the action of the return spring, the moving iron core remains in the initial non-operating position. During starting, the starter drive gear needs to move forward by approximately 12-22mm. Therefore, when the solenoid switch begins to close, a large magnetomotive force is needed to generate the necessary initial suction force. After actuation, the air gap decreases, and the electromagnetic suction force increases sharply, far exceeding the force required to maintain the closed state. For this reason, the solenoid switch uses two coils (pull-in coil and holding coil). Initially, both the pull-in coil and holding coil jointly generate electromagnetic suction force. After the switch contacts close, the pull-in coil automatically disengages from the operating state, and only the holding coil maintains the switch in the closed state. The holding coil current is relatively small, allowing it to be wound with thinner wire. This reduces the volume of the solenoid switch while achieving reasonable suction force matching. To ensure the reliability of the starter, emphasis must be placed on controlling the design quality of the solenoid switch.

Elreha electrical component functions

The main purposes of disconnectors (knife switches) are: 1, isolating the power supply to disconnect high-voltage maintenance equipment from live equipment, providing a clearly visible break point between them. 2, coordinating with circuit breakers to perform switching operations as required by system operating modes, thereby changing the system wiring configuration. 3, connecting or disconnecting low-current circuits. Disconnectors can perform the following operations: pulling or closing bypass currents of loop switches; pulling or closing grounding wires at transformer neutral points, but if an arc-suppression coil is connected to the neutral point, operation is only permitted when the system is fault-free; pulling or closing voltage transformers and lightning arresters; pulling or closing capacitive currents of busbars and equipment directly connected to busbars; pulling or closing no-load lines with capacitive currents not exceeding 5 amperes; triple-pole disconnectors can pull or close loads with voltages up to 10 kilovolts and currents below 24 amperes. When operating disconnectors, note that when energizing a line, first close the busbar-side disconnector, then the line-side disconnector, and finally the circuit breaker. When de-energizing a line, first open the circuit breaker, then open the disconnector. Do not pull or close high-voltage disconnectors under load.

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