What are the precautions for connecting the diesel generator set wires?

What are the precautions for connecting the diesel generator set wires?

The power line connections from the diesel generator set to the load should be carried out by qualified electricians with extensive experience, as are repairs and maintenance. In addition, the unit wiring must comply with the relevant electrical standards or other requirements, including grounding and ground fault protection requirements. The following is a detailed introduction to the connection of the diesel generator set wires by Ito Xiaobian.

wiring:

Due to the vibration of the generator, the generator should be connected with a soft wire so that when the generator is displaced, it will not damage the connecting column of the alternator or the power air switch. If the soft wire cannot be used due to installation problems, it can be near the generator. A junction box is installed, and a section from the box to the machine is connected with a soft wire. The connection must be placed on the pipe or the wire must not be fixed on the generator set. If the wire needs to be bent, please refer to the minimum bending radius.

The wire must match the voltage and current output of the generator. Before determining the thickness of the wire, it is necessary to consider the temperature of the room, the installation method and other wires arranged side by side. When a single-core copper wire is used, the sealing jacket should be made of a non-magnetic metal such as aluminum or copper, or non-metal such as Teflon. Lun Er. For example, with a magnetic metal sheath, the JC method is to cut a gap in the sheath to ensure that the current does not generate eddy currents.

Ito Power Company reminds everyone that all interfaces must be checked for firmness. Whether the phase is the same as the mains, this is especially important when using the automatic switch or when the unit is used as a parallel car.

Generator wire
 

protection

The generator is connected to the load and is protected by a circuit breaker. The circuit is automatically disconnected in case of overload or short circuit.

load

When designing the power supply system to ensure the balance of the load, not one phase of the load far exceeds the other, which will cause the alternator coil to overheat. Phase and phase imbalances can also damage sensitive three-phase devices connected to power systems. Make sure that one phase of current does not exceed the current of the generator. If there is a need to connect the unit to an existing power supply branch, it must be considered for redistribution so that these loads are balanced.

Power factor

The power factor (COS) of the load must be calculated on the design, if the power factor is below 0.8 hysteresis (inductance) the generator will be overloaded. The smoothest operating power factor for the output power of this unit is 0.8-1.

Pay special attention to avoid leading power factor when installing automatic or manual power factor correction devices such as capacitors. This will lead to voltage instability and damaging ultra-high voltage. In general, all power factor correctors are turned off when the generator is supplying power.

Grounding requirements:

1. Grounding requirements Depending on the region, the base of the machine must be absolutely grounded because shock absorbers are used to install the generator . The grounding cable should be retractable to prevent disconnection due to vibration.

2. The grounded wire or clamp can at least pass the generator full load current and comply with local specifications.

3, the alternator reconnect

Most alternators can be rewired to accommodate different output voltages. See Alternator Manual for connections. Before changing voltages, check that other components are adapted to the new voltage, such as power switches, current exchangers, wires, and Ammeter and so on.

Parallel operation:

When standard generators are paralleled or networked, special equipment needs to be installed.

Insulation test:

After installing the generator, do not rush to power on. Check the resistance of the coil first. The automatic voltage regulator should be disconnected and the rotary diode can be temporarily shorted with a wire, or disconnected first, and all controlled lines must be disconnected.

Use a 500V megohm meter or similar other device to disconnect the wire between the midpoint and ground. Measure the impedance from the terminal to ground. The insulation resistance of the machine to earth should exceed 5MΩ and the coil must be handled. Please consult Ito Technician for specific steps.

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