What are the protection configurations of diesel generator sets

1. Thermal relay protection. Thermal protection against long-term overload; (For reference only: (Fujian Yanan diesel generator set: 4000-080-999) Yaxiaonan will answer for you).

2. Current delay relay protection. It can prevent mechanical damage to the generator set and mechanical transmission system caused by short-term overload of maximum current, as well as short circuits in poor winding insulation and loose windings.

3. Fuse protection. When a short circuit occurs, the fuse blows quickly and cuts off the power supply to protect the generator set from damage;

4. Loss of pressure protection. It can prevent the generator set from starting automatically when it runs under low voltage and when the power supply is restored;

5. Zero-sequence protection. It can prevent the zero sequence current from damaging the generator set;

6. Electrical contact thermometer protection. It can prevent the generator set from being damaged by the high temperature of the bearing or winding;

7. Grounding protection can prevent the metal shell of the generator set from being electrified.

1) Stator winding interphase short circuit maintenance (differential maintenance is usually selected for more than 1MW) 2) Stator winding inter-turn short circuit maintenance. The turn-to-turn maintenance of the transformer is resonated by gas maintenance, and the phase-to-phase short-circuit maintenance and turn-to-turn short-circuit maintenance of the stator windings in the generator together constitute the main maintenance of the generator.

3) Grounding maintenance of stator windings (generators above 100MW need to have 100% maintenance area), and a single-phase short circuit can be repercussed if a single phase short circuit occurs arbitrarily in the stator winding.

4) One and two points of the excitation circuit are grounded and maintained.

5) Maintenance of abnormal decline or disappearance of excitation current (more than 100MW generator), usually called low excitation loss maintenance.

6) Generator external phase-to-phase short circuit maintenance, usually as a long-distance backup for generator phase-to-phase short circuit.

7) Stator winding overload maintenance.

8) Overload maintenance of rotor surface (negative sequence) (generators above 50MW) 9) Overvoltage maintenance of stator windings.

10) Excitation winding overload maintenance (more than 100MW generator) 11) Generator reverse power maintenance (more than 200MW steam turbine) 12) Generator low frequency maintenance (more than 300MW steam turbine) 13) Out-of-step maintenance (more than 300MW steam turbine).

14) Stator core over-excitation maintenance.

15) Other faults and abnormal operation and maintenance.

Four protections for diesel generator sets: overload protection, overcurrent protection, low oil pressure protection, water high temperature protection.

1. When overloaded, when the user's load exceeds the rated power of the diesel generator set, the diesel generator set will also be alarmed and shut down.

2. When the current is overcurrent, when the user's load exceeds the rated current of the diesel generator set, the diesel generator set will also have a shutdown alarm.

3. When the oil in the diesel generator set is insufficient or reaches the warning position, the diesel generator set will also send out a low oil pressure alarm and shut down.

4. When the water is high, when the temperature of the water tank of the diesel generator set reaches more than 98 degrees, the control module of the diesel generator set will find the water high temperature warning, and then shut down for protection.

The protection of the generator set includes: water high temperature protection, low oil pressure protection, over-current protection, over-load protection.

1.When the water is high, when the temperature of the water tank of the Yuchai generator set reaches more than 98 degrees, the control module of the generator will find the water high temperature warning and then stop for protection.

2.When the oil pressure is low, when the oil in the Yuchai generator set is insufficient or reaches the warning level, the generator set will also send out a low oil pressure alarm and shut down.

3.When the overcurrent occurs, when the load of the Yuchai generator set user exceeds the rated current of the generator set, the generator set will also have a shutdown alarm.

4.When overloaded, when the load of the Yuchai generator set user exceeds the rated power of the generator, the generator will also alarm and shut down.

5.There are many other protection parameters such as low voltage, short circuit, etc., which can be customized according to the different needs of customers.

1. Cooling system.

If there is a problem with the cooling system, the water temperature in the unit will be too high and the generator will be blocked, the water tank will leak, and the water level will be lowered, and the generator set will be unable to operate.

2. Fuel oil. The increase of carbon deposition leads to the impact of fuel injection at the fuel injector, which makes the fuel injector incinerated insufficiently, and the fuel injection of each cylinder of the engine is uneven, and the generator set cannot operate normally.

3. Battery. After the electrolyte water evaporates, it cannot be replenished in time, and the battery charger cannot be started, and the battery power is reduced after long-term discharge.

4. Engine oil. If the generator oil has a shelf life, if it is not used for a long time, the physical and chemical functions of the engine oil will change, and the cleanliness of the unit will deteriorate during operation, resulting in damage to the unit parts.

5. a fuel tank. After the water enters the unit, the water vapor pre-cooling in the air will condense into water droplets attached to the inner wall of the fuel tank, when the water droplets flow into the diesel, it will cause the water content of the diesel fuel to exceed the standard, when the oil-water mixture enters the high-pressure oil pump of the engine, it will corrode the precision coupling parts, and the generator set will be damaged after a long time.

6. Three filters. During the operation of the diesel generator set, oil or impurities will be deposited on the filter wall, and if the deposit is too much, the oil circuit will not be dredged, and the generator set will not operate normally.

7. Lubrication system and seals.

Due to the change of the physical and chemical function of the lubricating oil for a long time and the iron filings that occur after mechanical wear, these not only reduce the lubrication effect, but also damage other parts, the lubricating oil also has a certain corrosive effect on the rubber sealing ring, and the other oil seals themselves will also reduce the sealing effect due to aging over time.

8. Line connection.

If the diesel generator is used for a long time, the wiring joint may be loose, and it needs to be checked regularly.

1.High and low voltage pre-alarm and shutdown of generator set.

2.High and low frequency pre-alarm and shutdown of generator sets.

3.Buddha that the sudden high water temperature alarm, shutdown.

4.Generator low-speed overspeed pre-alarm, shutdown.

5.Generator low oil pressure alarm, shutdown.

6.High and low battery voltage alarm.

7.Overcurrent alarm, tripping, shutdown.

8.Short-circuit fault tripping.

9.The oil pressure sensor is disconnected and alarmed, and the machine is stopped.

10.Engine speed sensing signal loss alarm, shutdown.

11.The generator phase sequence error alarm shutdown.

12.The generator set will be shut down according to the ground fault alarm.

13.Emergency shutdown Initiate alarm shutdown.

14.Low fuel level alarm.

The four maintenance inside the diesel generator set refers to 1Water temperature is too high maintenance 2Oil pressure is too low maintenance 3

Overcurrent Maintenance 4Overload maintenance These functions are primarily used to maintain the machine and prevent greater damage if people are not paying attention. Detailed maintenance plays a role in the following:

1.When the water temperature in the diesel generator set reaches more than 95 degrees, the water temperature in the diesel generator set is too high module to respond, and the diesel engine will alarm and then shut down to cool down and find the reason.

2.Oil pressure is too low maintenance: oil pressure is too low here refers to the oil rather than fuel, the fuel is too low the machine can be significantly audible, check the fuel can be supplemented, this refers to the oil, when the oil is lower than the warning position, the generator set will alarm and shut down.

3.Overcurrent maintenance: refers to when the user's operating load exceeds the rated power of the generator set, the generator set will alarm and shut down, this function is the most useful, if there is no such function, the smoke exhaust will also be observed.

4.Overload maintenance: This function is similar to overcurrent maintenance, and the primary maintenance of overload maintenance is the maintenance of the user's overload operation and exceeding the rated power of the generator set.

1.When the temperature of the water tank reaches more than 98 degrees, the control module of the generator will find the water high temperature warning, and then stop the protection.

2.Low oil pressure protection, when the oil in the generator is insufficient or reaches the warning level, the generator set will also send out a low oil pressure alarm and shut down.

3.Overcurrent protection, when the user's load exceeds the rated current of the generator set, the generator set will also have a shutdown alarm.

4.Overload protection, when the user's load exceeds the rated power of the generator, the generator will also have an alarm shutdown.

In addition, the generator set has many other protection parameters, such as: low voltage, short circuit, etc.

Hope it helps.

High and low voltage pre-alarm and shutdown of generator set.

High and low frequency pre-alarm and shutdown of generator sets.

Buddha that the sudden high water temperature alarm, shutdown.

Generator low-speed overspeed pre-alarm, shutdown.

Generator low oil pressure alarm, shutdown.

High and low battery voltage alarm.

Overcurrent alarm, tripping, shutdown.

Short-circuit fault tripping.

The oil pressure sensor is disconnected and alarmed, and the machine is stopped.

Engine speed sensing signal loss alarm, shutdown.

The generator phase sequence error alarm shutdown.

The generator set will be shut down according to the ground fault alarm.

Emergency shutdown Initiate alarm shutdown.

Low fuel level alarm.

The protection function of diesel generator set is introduced as follows:

1) Differential protection. It is used to reflect the generator coil and the interphase short circuit it induces.

2) Inter-turn protection. It is used to react to a short circuit between one branch of one phase of the stator winding of a generator or between two branches.

3) Overcurrent protection. It is used to remove the overcurrent caused by the external short circuit of the generator, and as a backup protection against the internal fault of the generator.

4) Single-phase grounding protection reflects the single-phase grounding fault of stator winding.

5) Asymmetric overload protection reflects the overcurrent caused by asymmetric overload, which should generally be protected by the one-phase overload signal in the device.

6) Symmetrical overload protection. Reflecting the overcurrent caused by symmetrical overload, it should generally be installed in one-phase overload signal protection.

7) Overvoltage protection. Reaction generator stator winding overvoltage.

8) Grounding protection of the excitation circuit, divided into one point of the rotor grounding protection and two points of the rotor grounding protection. It reflects that the insulation of the excitation circuit is not good.

9) Loss of magnetism protection reaction generator due to excitation failure caused by generator demagnetization, according to the severity of demagnetization, so that the generator load reduction or cutting plant electricity or jumping generator.

10) Generator water cut-off protection. Installed on the water-cooled generator set, reflecting the disappearance of the generator cooling water source.

Basic unit.

This type of unit is the most common, consisting of a diesel engine, a closed water tank, a fuel tank, a muffler, a synchronous alternator, an excitation voltage adjustment device, a control box (screen), a coupling and a chassis. The unit has the function of automatic adjustment of voltage and speed. It is usually available as a mains or standby power source.

Self-starting unit.

The unit is based on the basic unit with an automatic control system. It has the ability to automate. When the external power supply (mains) suddenly fails, the unit can automatically start, automatically switch on/off, automatically run, automatically transmit power and automatically stop and other functions; When the oil pressure is too low, the oil temperature or the cooling water temperature is too high, it can automatically send out an audible and visual alarm signal; When the unit is overspeeding, it can automatically stop the emergency for protection.

Microcomputer control automation unit.

The unit is composed of a diesel engine with perfect performance, a three-phase brushless synchronous generator, an automatic fuel supply device, an automatic oil supply device, an automatic cooling water supply device and an automatic control screen. The automatic control panel is controlled by a programmable automatic controller PLC, which is equipped with various fault alarms and automatic protection devices in addition to the functions of self-starting, self-switching, self-running, self-putting and self-stopping. In addition, it connects with the main computer through the RS232 communication interface for centralized monitoring, remote control, remote signaling and telemetry, and is unattended.