Diagnostic Tools for Generator Testing Part 2

Megger

emergency diesel generator

These are sometimes referred to as megohmmeter tests and promoted as insulation testers. When current passes through wires or coils, it generates heat. Due to overheating or prolonged use, the insulation layer may be damaged. A megohmmeter transmits high voltage and low current through wires or coils. A common rule of thumb is that insulation readings exceeding 1 megaohm are acceptable. Alternators with degraded or damaged stator winding insulation must be replaced. Any insulation damaged wires in the control system should be inspected and replaced.

digital control system

The power generation system (such as diesel generators) can be divided into three main parts:

Prime mover - engine and related support systems.

AC generator - generating electricity. Also known as the generator end. The frequency is determined by the rotational speed. The output voltage of the stator configuration.

Control System - Connect the engine and AC generator to meet load requirements.

The control system adopts a programmable logic controller (PLC) configuration. The power supply converts the AC power supplied by the input panel into DC for use by the central processing unit (CPU). The CPU receives inputs and transmits outputs through the I/O section. The input and output are low-voltage DC signals. These signals occur so quickly that traditional handheld instruments cannot measure this transformation.

The CPU receives inputs from the system, calculates appropriate outputs, and allocates appropriate components. Receive inputs from the following components: temperature sensor, speed sensor, and pressure sensor. The output is the component that sends, such as light-emitting diodes (LEDs), syringe fire signals, and internal system relays.

It is almost impossible to troubleshoot, repair, test, and monitor these advanced systems solely using standard handheld instruments. The control panel displays errors and abnormal operating conditions. Some of them have simplified troubleshooting steps. Many manufacturers offer electronic repair tools as an option. Technicians can access the controller for testing, historical recording, and detailed operating parameters.

Electronic maintenance tools and handheld instruments are often used for fault diagnosis of complex systems. An example in this regard is as follows:

The generator is shut down during normal operation. Technicians access the controller and three-fifths of the syringes have alarm conditions. Both open circuit and short circuit alarms are present. The software is unable to locate the exact cause. CPU output disconnected, resistance test supports alarm. The fuel injector harness inspection found that the harness had melted due to the failure of the harness hanger. Replace the syringe harness and test the device.

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