Elreha electrical components Germany Elreha model Elreha price

Elreha electrical components refer to switching devices capable of closing, carrying, and breaking current under normal circuit conditions, and capable of closing, carrying, and breaking current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The boundary between high and low voltage is relatively vague; 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 can 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. The distribution system includes transformers and various high- and low-voltage electrical equipment, while low-voltage circuit breakers are a type of electrical apparatus with extensive usage.

Elreha electrical component characteristics

Operating characteristics: The main characteristics characterizing the performance of a synchronous generator are the no-load characteristic and the load operating characteristic. These characteristics are an important basis for users to select 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, called the armature reaction magnetic field. Its speed is exactly equal to the rotor speed, and the two rotate synchronously. The armature reaction magnetic field of a synchronous generator and the rotor excitation magnetic field can both be approximately considered to be 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 decrease; when the load is capacitive, the armature reaction magnetic field has a magnetizing effect, causing the generator output voltage to increase. Load operating characteristics: Mainly refer to the external characteristic and the adjustment characteristic. 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 adjustment 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, and the design quality of the solenoid switch 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 through the shift 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. In addition, it is required to minimize volume and weight as much as possible. Based on the above characteristics, the contact structure of the solenoid switch generally adopts a contact form, i.e., the moving contact is made into a bridge shape or disc shape to provide a larger heat dissipation surface 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 in the brass bushing equipped with a solenoid coil. The moving iron core pull rod is connected to the shift fork unidirectional clutch. Under the action of the return spring, the moving iron core normally remains in the initial non-working position. During starting, the starter drive gear needs to move forward by about 12-22mm. Therefore, when the solenoid switch begins to close, a large magnetomotive force is required to generate the necessary initial suction force. After being pulled in, the air gap decreases, and the electromagnetic suction force increases sharply, greatly 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, 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 working state, and the holding coil alone maintains the switch in the closed state. The holding coil current is relatively small and can be wound with thinner wire, which not only reduces the volume of the solenoid switch but also achieves reasonable suction force matching. To ensure the reliability of the starter, special attention must be paid to the design quality of the solenoid switch.

Elreha electrical component functions

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