Diesel generating set dummy load automatic control system

Abstract

The utility model discloses a dummy load automatic control system for a diesel generating set. The dummy load automatic control system comprises a voltage measurement module, a current measurement module, a circuit breaker, a contactor and a controller embedded with control software, the input ends of the voltage measurement module and the current measurement module are electrically connected with the power output end of the diesel generating set, and the output ends of the voltage measurement module and the current measurement module are electrically connected with the input end of the controller; the input end of the circuit breaker is electrically connected with the power output end of the diesel generating set, and the output end of the circuit breaker is electrically connected with the input end of the contactor; the output end of the controller is electrically connected with the input end of the contactor, and the output end of the contactor is electrically connected with the power end of the dummy load. The automatic control system for the dummy load of the diesel generating set can automatically control automatic input or removal of dummy load input, so that no-load or low-load operation of the generating set is avoided, and safe operation and service life of the generating set are effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel generators, in particular to an automatic control system for a diesel generator set's dummy load. Background Art

[0002] In order to prevent faults such as blue smoke exhausting, oil leakage from the supercharger joint surface, injector damage, and carbon deposition in a diesel generator set due to long-term no-load or low-load operation, which may affect the safe operation of the generator set and shorten its service life, the current solution is to configure a dummy load and a dummy load control system for the generator set.

[0003] A dummy load is an electronic device used to simulate a power load, usually composed of multiple resistors. Connecting the dummy load electrically to the output end of the generator set can test the power output capacity and performance of the generator set. The power value of the dummy load configured for a diesel generator set is usually 30% of the rated power of the generator set.

[0004] The dummy load control system realizes the connection / removal of the dummy load by controlling the power supply / power-off of the dummy load power supply circuit. The dummy load power supply process is: three-phase AC power supply of the generator set → circuit breaker → main contact of the contactor → dummy load. The dummy load control process is: the contactor coil is energized / de-energized → the main contact of the contactor is closed / opened → the dummy load is connected / removed.

[0005] The traditional dummy load control system for a diesel generator set realizes the connection / removal of the dummy load through manual control. Specifically, a knob switch is connected in series in the control circuit of the contactor coil, and the dummy load control process is completed through manual operation of the knob switch. The specific process is: the knob switch is closed / opened → the contactor coil is energized / de-energized → the main contact of the contactor is closed / opened → the dummy load is connected / removed.

[0006] However, the traditional dummy load control system for a diesel generator set controlled manually has a low level of automation and is highly dependent on the operator of the generator set. The operator must pay attention to the load power of the generator set in real time and manually control the connection / removal of the dummy load in a timely manner. If the operator is slightly negligent, the generator set may operate under no-load or low-load conditions. Over time, faults such as blue smoke exhausting, oil leakage from the supercharger joint surface, injector damage, and carbon deposition will occur in the generator set, which will affect the safe operation of the generator set and shorten its service life. Summary of the Utility Model

[0007] Based on this, in view of the above technical problems, it is necessary to provide an automatic control system for a diesel generator set's dummy load, which can realize the automatic connection or removal of the dummy load during the power supply process of the generator set, thereby avoiding the no-load or low-load operation of the generator set caused by human negligence and ensuring the safe operation and service life of the generator set.

[0008] The utility model provides an automatic control system for a diesel generator set dummy load, which includes a voltage measurement module, a current measurement module, a circuit breaker, a contactor and a controller embedded with control software;

[0009] The input ends of the voltage measurement module and the current measurement module are both electrically connected to the power output end of the diesel generator set, and the output ends of the voltage measurement module and the current measurement module are both electrically connected to the input end of the controller;

[0010] The input end of the circuit breaker is electrically connected to the power output end of the diesel generator set, and the output end of the circuit breaker is electrically connected to the input end of the contactor;

[0011] The output end of the controller is electrically connected to the input end of the contactor, and the output end of the contactor is electrically connected to the power supply end of the dummy load.

[0012] In one embodiment, the controller includes a voltage measurement unit, a current measurement unit and a normally open relay output port. The voltage measurement module is electrically connected to the voltage measurement unit, and the current measurement module is electrically connected to the current measurement unit.

[0013] In one embodiment, the contactor includes a contactor main contact and a contactor coil. The normally open relay output port is electrically connected to the contactor coil. The output end of the circuit breaker is electrically connected to the input end of the contactor main contact, and the output end of the contactor main contact is electrically connected to the power supply end of the dummy load.

[0014] The beneficial effects of the utility model are as follows: for the automatic control system for the diesel generator set dummy load of the utility model, the controller can collect the working voltage and current of the diesel generator set in real time and determine the load power of the diesel generator set based on the voltage and current. Then, according to the load power, a signal is sent from the normally open relay output port to the contactor to control whether the contactor is connected to the dummy load, so as to realize the automatic input or cut-off of the dummy load, thereby avoiding the no-load or low-load operation of the generator set, and effectively ensuring the safe operation and service life of the generator set. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the automatic control system for the diesel generator set dummy load provided by the embodiment of the utility model.

[0016] Description of the reference numerals: 1. Circuit breaker; 2. Contactor; 3. Voltage measurement module; 4. Current measurement module; 5. Controller. Detailed Embodiment

[0017] In order to make the above objects, features and advantages of the utility model more obvious and understandable, the following detailed description of the specific embodiments of the utility model is made with reference to the drawings.

[0018] In one embodiment, as Figure 1 shown, Figure 1 Figure 5 is a schematic structural diagram of the automatic control system for the diesel generator set dummy load provided by the embodiment of the present utility model. The automatic control system for the diesel generator set dummy load in this embodiment includes a voltage measurement module 3, a current measurement module 4, a circuit breaker 1, a contactor 2, and a controller 5 embedded with control software.

[0019] The controller 5 embedded with control software in this embodiment is a generator set controller 5 with PLC programming function. When in use, control software containing control logic is programmed and embedded in the controller 5 in advance. The contactor 2 is an AC contactor.

[0020] The input ends of both the voltage measurement module 3 and the current measurement module 4 are electrically connected to the power output end of the diesel generator set, and the output ends of both the voltage measurement module 3 and the current measurement module 4 are electrically connected to the input end of the controller 5.

[0021] Among them, the controller 5 includes a voltage measurement unit, a current measurement unit, and a normally open relay output port. The voltage measurement module 3 is electrically connected to the voltage measurement unit, and the current measurement module 4 is electrically connected to the current measurement unit.

[0022] The input end of the circuit breaker 1 is electrically connected to the power output end of the diesel generator set, and the output end of the circuit breaker 1 is electrically connected to the input end of the contactor 2.

[0023] Specifically, when the contact of the circuit breaker 1 is closed, the output power of the diesel generator set is connected to the dummy load, providing working power for the dummy load and providing overload and short - circuit protection functions for the power supply circuit of the dummy load.

[0024] The output end of the controller 5 is electrically connected to the input end of the contactor 2, and the output end of the contactor 2 is electrically connected to the power supply end of the dummy load.

[0025] In this embodiment, the contactor 2 includes a contactor main contact and a contactor coil. The normally open relay output port is electrically connected to the contactor coil. The output end of the circuit breaker 1 is electrically connected to the input end of the contactor main contact, and the output end of the contactor main contact is electrically connected to the power supply end of the dummy load.

[0026] The working principle of the automatic control system for the diesel generator set dummy load of the present utility model is:

[0027] During the power supply process of the diesel generator set, the controller 5 collects the voltage signal and current signal of the diesel generator set, and determines the load power of the generator set based on the current signal and voltage signal to realize the automatic monitoring of the load power of the generator set. When the load power of the generator set is less than 30% of the rated power of the unit, the controller 5 controls the normally open output port of the relay to close, the coil of the contactor 2 is energized, and then the main contacts of the contactor 2 are closed to put the dummy load into operation; when the load power of the generator set is greater than 60% of the rated power of the unit, the controller 5 issues a control to disconnect the normally open output port of the relay, the coil of the contactor 2 loses power, and then the main contacts of the contactor 2 are disconnected to cut off the dummy load.

[0028] The automatic dummy load control system for the diesel generator set of the present invention sends a signal from the normally open output port of the relay to the contactor according to the load power to control whether the contactor is connected to the dummy load, thereby realizing the automatic input or removal of the dummy load, thus avoiding the situation of no-load or low-load operation of the generator set, and effectively ensuring the safe operation and service life of the generator set.

[0029] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An automatic control system for a diesel generator set's dummy load, characterized in that, It includes a voltage measurement module (3), a current measurement module (4), a circuit breaker (1), a contactor (2), and a controller (5) embedded with control software; The input ends of the voltage measurement module (3) and the current measurement module (4) are electrically connected to the power output end of the diesel generator set, and the output ends of the voltage measurement module (3) and the current measurement module (4) are electrically connected to the input end of the controller (5); The input end of the circuit breaker (1) is electrically connected to the power output end of the diesel generator set, and the output end of the circuit breaker (1) is electrically connected to the input end of the contactor (2); The output end of the controller (5) is electrically connected to the input end of the contactor (2), and the output end of the contactor (2) is electrically connected to the power supply end of the dummy load.

2. The automatic control system for the diesel generator set dummy load according to claim 1, wherein The controller (5) includes a voltage measurement unit, a current measurement unit, and a normally open relay output port. The voltage measurement module (3) is electrically connected to the voltage measurement unit, and the current measurement module (4) is electrically connected to the current measurement unit.

3. The automatic control system for the diesel generator set dummy load according to claim 2, characterized in that, The contactor (2) includes a contactor main contact and a contactor coil. The normally open relay output port is electrically connected to the contactor coil. The output end of the circuit breaker (1) is electrically connected to the input end of the contactor main contact, and the output end of the contactor main contact is electrically connected to the power supply end of the dummy load.

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