Diesel generator set starting process monitoring system

Abstract

This invention discloses a diesel generator set startup process monitoring system, comprising: a single startup time limit unit, a single startup judgment unit, an interval time unit, a single failure counting unit, an anti-jump automatic reset unit, an automatic zeroing unit, a startup interlock signal unit, a generator interlock signal unit, a common alarm signal unit, a generator control unit, a manual reset unit, and a manual zeroing unit. The advantages of this invention are: it visualizes the multiple single startup processes of the diesel generator set, eliminating monitoring blind spots, reducing maintenance errors, and improving the reliability of microgrid power equipment; it provides effective technical measures to prevent excessive startup of the diesel generator set, reduce human error intervention, protect equipment and devices, and improve the safety and availability of power equipment; and it strengthens startup operation management through monitoring technology, improving the adaptability of the diesel generator set to various micro-power station and islanded scenario environmental conditions.

Description

Technical Field

[0001] This invention relates to the operation management and control of power equipment, specifically to a diesel generator set over-start protection and monitoring system for micro power plants or microgrid systems, belonging to the field of diesel generator set start-up process monitoring. Background Technology

[0002] In intelligent small-scale power systems such as micro-power stations or microgrids, diesel generator sets are often used as backup power sources to achieve comprehensive and complementary utilization of multiple energy sources and meet the power supply reliability requirements of isolated scenarios. To fully utilize solar and wind power resources and effectively protect the ecological environment, diesel generator sets mostly adopt standby operation mode and must meet the requirements of frequent and reliable start-stop operations to ensure that the diesel generator set power supply coordinates with the power station's electrochemical energy storage system and distributed new energy sources, achieving intelligent and flexible scheduling of energy flow.

[0003] Different isolated scenarios, such as islands, high-altitude low-pressure areas, deserts, and cold regions, present harsh and variable environmental conditions that directly affect the starting success rate of diesel generator sets, leading to multiple repeated attempts during a single starting event. Engine manufacturers of diesel generator sets impose restrictions on the single-run time of the starting device, the starting operation interval, and the number of consecutive single-start attempts. Furthermore, the starting battery itself is a dedicated electrochemical energy storage device for starting, and its capacity performance and cycle life are subject to certain limitations regarding frequent high-current operations. In actual operation projects, improper operation during the diesel generator set starting process frequently causes equipment failures, such as overheating of the starter motor and component burnout, rapid loss of electrochemical energy storage capacity in the starting battery, or even performance failure. Methods to prevent over-starting typically involve setting parameters in the diesel generator set controller, including single-start time, operation interval, the number of attempts to determine a failed start, and alarm methods. The main problem with this method is that only a single overall alarm signal is output for each failed start, and the multiple single-start attempts during the intermediate process cannot be monitored, lacking individual status and alarm signals for each attempt. Therefore, maintenance personnel cannot control the intermediate process and may impose improper manual interventions without restriction to reset and restart, resulting in excessive starting operations of the diesel generator set, which often leads to failure and damage to the starter motor and starter battery. Summary of the Invention

[0004] To address the aforementioned issues, this invention designs a diesel generator set start-up process monitoring system. Based on the working characteristics and protection requirements of the diesel generator set start-up device and the electrochemical energy storage start-up battery, the system clarifies the content that needs to be monitored during the start-up process. To address the issue of blind spots in the monitoring of multiple single-attempt start-up processes, the system designs corresponding functional units and connection schemes to visualize the multiple single-attempt process and associate it with the input and output of the diesel generator set controller, thus forming a complete start-up process monitoring system.

[0005] The technical solution of this invention is as follows:

[0006] The diesel generator set start-up process monitoring system includes a single start time limit unit, a single start judgment unit, an interval time unit, a single failure counting unit, an anti-jump automatic reset unit, an automatic zeroing unit, a start-up interlock signal unit, a generator interlock signal unit, a common alarm signal unit, a generator control unit, a manual reset unit, and a manual zeroing unit.

[0007] The single-start time limit unit includes a first time relay T1, a normally open contact S-1 of the start extension relay S, and a second normally open contact T1-2 of the first time relay T1.

[0008] The single-start determination unit includes a third time relay F, a first normally open contact T1-1 of a first time relay T1, and a second normally closed contact R-2 of a running extension relay R.

[0009] The interval time unit includes a second time relay T2;

[0010] The single failure counting unit includes a counting relay C and a second normally open contact F-2 of a third time relay F;

[0011] The anti-jump automatic reset unit includes a first normally closed contact R-1 of the operating extension relay R, a normally closed contact T2-1 of the second time relay T2, and a first normally open contact F-1 of the third time relay F.

[0012] The automatic reset unit includes a normally open contact R-3 of the operating extension relay R;

[0013] The start-lock signal unit includes a normally open contact T2-2 of a first control relay P and a second time relay T2;

[0014] The unit interlocking signal unit includes the normally open contact C-1 of the second control relay B and the counting relay C;

[0015] The common alarm signal unit includes a third control relay CA, a first normally open contact P-1 of a first control relay P, and a first normally open contact B-1 of a second control relay B.

[0016] The unit control unit includes a unit controller GCT, a start relay Q, a run relay Y, a start extension relay S, a run extension relay R, a normally open contact CA-1 of a third control relay CA, a second normally open contact P-2 of a first control relay P, and a second normally open contact B-2 of a second control relay B.

[0017] The manual reset unit includes a self-resetting normally closed push-button switch RB1;

[0018] The manual reset unit includes a self-resetting normally open push button switch RB2.

[0019] The connection method of the diesel generator set start-up process monitoring system is as follows:

[0020] The single-start timeout unit controls the output state of the single-start determination unit via a single-start timeout signal.

[0021] The single-start determination unit sends the single-start status output signal to the interval time unit, the single-failure counting unit, and the anti-jump automatic reset unit, respectively, to control the next allowed operation time, the single-failure count relay accumulation, and the anti-jump automatic reset of the single-start time limit unit.

[0022] The interval time unit outputs a signal to the start-lock signal unit, which locks the next start operation when the start operation interval time is insufficient. At the same time, through the signal delay coordination of the single start determination unit and the anti-jump automatic reset unit, a time difference is formed between the single start time limit unit and the single start time limit unit to release sequentially, thereby avoiding the reset operation from jumping cyclically.

[0023] The single failure counting unit sends a signal indicating that the cumulative number of single failures has exceeded the limit to the unit lockout signal unit, thereby locking the diesel generator set into an unavailable state.

[0024] The anti-jump automatic reset unit sends a delayed coordination signal to the single-start time limit unit, so that the single-start time limit unit and the interval time unit are reset sequentially;

[0025] The automatic zeroing unit sends the diesel generator set operation signal to the single failure counting unit, and automatically resets the count when the diesel generator set is running.

[0026] The start-up interlock signal unit sends the start-up interval time timing status signal to the unit control unit to interlock the start-up operation, and at the same time provides an alarm input to the common alarm signal unit;

[0027] The generator set interlock signal unit sends a signal indicating that the number of single failures has exceeded the limit to the generator set control unit, thereby interlocking the diesel generator set and providing an alarm input to the common alarm signal unit.

[0028] The common alarm signal unit will collect the start-up interlock signal and the unit interlock signal and send them to the unit control unit;

[0029] The generator set control unit sends the diesel generator set start control extension signal and the operating status extension signal to the single start time limit unit, while monitoring the diesel generator set operation and providing current operating status prompts.

[0030] The manual reset unit is connected to the single-start time limit unit;

[0031] The manual reset unit is connected to the single failure counting unit.

[0032] The specific connection methods within each functional unit are as follows:

[0033] The single-start time limit unit: the second normally open contact T1-2 of the first time relay T1 is connected in series with the manual reset unit, then in parallel with the normally open contact S-1 of the start extension relay S, and then in series with the anti-jump automatic reset unit to control the first time relay T1;

[0034] The single-start determination unit: the first normally open contact T1-1 of the first time relay T1, connected in series with the second normally closed contact R-2 of the running extension relay R, controls the third time relay F;

[0035] The interval time unit is controlled by the first normally open contact F-1 of the third time relay F of the anti-jump automatic reset unit, which controls the second time relay T2.

[0036] The single failure counting unit: the second normally open contact F-2 of the third time relay F controls the counting accumulation of the counting relay C; the automatic clearing unit and the manual clearing unit are connected in parallel to control the counting of the counting relay C to be cleared;

[0037] The anti-jump automatic reset unit: the first normally closed contact R-1 of the running extension relay R and the normally closed contact T2-1 of the second time relay T2 are connected in series in the circuit of the single start time limit unit; the first normally open contact F-1 of the third time relay F controls the interval time unit.

[0038] The automatic reset unit: The normally open contact R-3 of the running extension relay R is connected in parallel with the manual reset unit to control the single failure counting unit;

[0039] The start-lock signal unit: the normally open contact T2-2 of the second time relay T2 controls the first control relay P;

[0040] The unit interlocking signal unit: the normally open contact C-1 of the counting relay C controls the second control relay B;

[0041] The common alarm signal unit: the first normally open contact P-1 of the first control relay P and the first normally open contact B-1 of the second control relay B are connected in parallel to control the third control relay CA;

[0042] The unit control unit: The output of the unit controller GCT is connected to the start relay Q and the run relay Y, and is respectively extended to the start extension relay S and the run extension relay R; the second normally open contact P-2 of the first control relay P, the second normally open contact B-2 of the second control relay B, and the normally open contact CA-1 of the third control relay CA are respectively connected to the unit controller GCT.

[0043] The manual reset unit: The self-reset normally closed push button switch RB1 is connected to the single start time limit unit;

[0044] The manual reset unit: The self-reset normally open push button switch RB2 is connected to the single failure counting unit.

[0045] The functions of the diesel generator set start-up process monitoring system described in this invention are as follows:

[0046] (1) Input of start-up operation status judgment condition and unit response: When the diesel generator set starts up, the unit control unit provides the start-up control signal and the operation status signal to the single start-up time limit unit; the single start-up time limit unit keeps track of the start-up duration.

[0047] (2) Successful start determination and processing: If the diesel generator set reaches the set operating state within the set time and the diesel generator set operating state signal is valid, the single start determination unit will not change its output and will continue to maintain the initial reset state. At this time, the single start time limit unit will release and reset automatically, and the automatic clearing unit will automatically clear the single failure counting unit to ensure the correctness of subsequent operation logic.

[0048] (3) Judgment and handling of single start failure: If the start timer expires and the diesel generator set still does not reach the set operating state, the single start time limit unit sends an expiration signal, and the single start judgment unit confirms and outputs a single start failure signal. The single failure counting unit counts once based on the rising edge signal, and at the same time, the interval time unit starts timing the interval time required for the next start operation. Within the interval time, the single start time limit unit and the single start judgment unit maintain the failure judgment locked state. The start lockout signal unit maintains the start lockout signal, triggers the common alarm unit, and temporarily locks the start operation of the diesel generator set through the unit control unit, while giving an information prompt.

[0049] (4) Cyclic Start-up Attempt: When any single start-up failure is confirmed, the interval time unit automatically starts timing. When the interval duration reaches the set value, the following automatic operations are performed in sequence: The interval time unit sends a signal to reset and release the single start-up time limit unit; the single start-up determination unit is reset and the single start-up failure signal is released; the interval time unit is reset after a delay, and the feedback causes the single start-up time limit unit to return to its initial state in preparation for the next operation cycle. The delay control realizes the anti-jump reset function, which reliably eliminates the possibility of competition and jump between the single start-up time limit unit and the single start-up determination unit; the single start-up failure counting unit is reset in preparation to receive the next rising edge counting signal; the start-up lockout signal unit is reset, and the start-up lockout is released through the unit control unit; when the unit controller sends a start-up signal again, the system enters a new single start-up operation judgment and processing process.

[0050] (5) Diesel generator set lockout and handling: When the count value of the single failure counting unit reaches the set number, the action signal of the counting relay C is sent to the generator set lockout signal unit, triggering the common alarm signal unit, and the diesel generator set is locked out through the generator set control unit, and the prompt handling information is displayed; when the diesel generator set lockout occurs, the diesel generator set lockout is released through the manual reset unit, and the diesel generator set is restored to usable conditions.

[0051] (6) Test function: According to the needs of system maintenance and testing, the manual reset unit provides a manual reset function to manually reset the single start time limit unit and simultaneously release the start lockout of the diesel generator set; the manual zeroing unit provides manual count zeroing and release of diesel generator set lockout test;

[0052] (7) Parameter coordination: The diesel generator set start-up process monitoring system can be used independently or simultaneously with the start-up settings of the generator set controller GCT. When used simultaneously with the start-up settings of the generator set controller GCT, the parameter coordination relationship is as follows: the delay setting of the first time relay T1 is the same as the start-up duration setting of the generator set controller GCT; the delay setting of the second time relay T2 is the same as the start-up attempt interval of the generator set controller GCT; the cumulative setting of the number of times the counting relay C is activated is the same as the repeated start-up number setting of the generator set controller GCT; and the delay setting of the third time relay F is not less than 0.5 seconds.

[0053] Furthermore, the specific functions of each unit are described below:

[0054] The single-start time limit unit controls the duration of a single start, and the normally open contact S-1 of the start extension relay S provides a start control pulse signal to start the system. The first time relay T1 times the time of each single start operation, and its second normally open contact T1-2 is momentarily closed and momentarily open to perform self-locking control of the timing process.

[0055] The single-start determination unit performs logical judgment to confirm whether the start is successful or not. The first normally open contact T1-1 of the first time relay T1 is delayed and instantaneously open, reflecting the single-start timeout signal; the second normally closed contact R-2 of the running extension relay R is instantaneously open and instantaneously closed, reflecting the operating status of the diesel generator set; the third time relay F reflects the single-start failure signal.

[0056] The interval time unit controls the time interval between single start operations, and the second time relay T2 performs timing measurement.

[0057] The single failure counting unit accumulates the number of single startup failures. The counting relay C is triggered by the rising edge of a pulse signal. The second normally open contact F-2 of the third time relay F is momentarily closed and momentarily open to provide a trigger control signal.

[0058] The anti-jump automatic reset unit employs enhanced delay timing logic for the repeated automatic reset process during the cyclic startup attempt. The normally closed contact T2-1 of the second time relay T2 is delayed-open and momentarily closed. When the operation interval meets a set value, the single-start time limit unit is reset, allowing restart. The first normally closed contact R-1 of the running extension relay R is momentarily open and momentarily closed, triggering automatic reset after successful diesel generator start-up. The first normally open contact F-1 of the third time relay F is momentarily closed and delayed-open, causing the reset delay of the second time relay T2 to lag behind that of the first time relay T1.

[0059] The automatic reset unit resets the single failure count to zero. The automatic reset is performed by the normally open contact R-3 of the running extension relay R. The original failure count is automatically reset to zero when the diesel generator set starts successfully.

[0060] The start-lock signal unit provides start-lock control during the cyclic start-up attempt process. The normally open contact T2-2 of the second time relay T2 is momentarily closed and momentarily open. When the start interval time starts to be measured, the first control relay P is triggered to issue a start-lock signal.

[0061] The unit interlock signal unit monitors the number of consecutive starts exceeding the limit. The normally open contact C-1 of the counting relay C is momentarily closed and momentarily open. When the number of starts exceeds the limit, the second controller B is triggered to issue a unit interlock signal.

[0062] The common alarm signal unit summarizes the start-up interlock signal and the unit interlock signal, provides a common alarm signal, and triggers the third control relay CA to issue a common alarm prompt.

[0063] The generator set control unit provides diesel generator set signals to the single-start time-limit unit and controls the diesel generator set according to the start-up status feedback signal. The generator set controller GCT outputs the start-up relay Q and the operation relay Y, and provides operation signals to the single-start time-limit unit through the start-up extension relay S and the operation extension relay R. The control signals of the first control relay P, the second control relay B, and the third control relay CA are input to the generator set controller GCT to control the diesel generator set, and the generator set controller GCT displays alarm prompts.

[0064] The manual reset unit uses the self-resetting normally closed push button switch RB1 to manually reset the single start time limit unit according to the needs of operation, maintenance and testing, thereby triggering the release of the start lockout signal and releasing the start lockout.

[0065] The manual reset unit uses the self-resetting normally open push button switch RB2. When the cumulative number of single start failures exceeds the limit and the diesel generator set is locked, the diesel generator set can be unlocked by manual reset, restoring the diesel generator set to a usable state.

[0066] The beneficial effects of this invention are as follows:

[0067] (1) Eliminate the monitoring blind spot in the intermediate process of diesel generator set attempt to start, visualize multiple single processes, reduce operation and maintenance errors, and improve the reliability of microgrid power equipment;

[0068] (2) Provide effective technical measures to prevent excessive starting of diesel generator sets, reduce human error intervention, protect equipment and devices, and improve the safety and availability of power equipment;

[0069] (3) Strengthen startup operation management through monitoring technology to improve the adaptability of diesel generator sets to various micro power stations and isolated scenario environmental conditions.

[0070] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0071] Figure 1 This is a system structure diagram of an embodiment of the present invention;

[0072] Figure 2 This is a logic flowchart of an embodiment of the present invention;

[0073] Figure 3 This is a schematic diagram of a single-start time-limited unit according to an embodiment of the present invention;

[0074] Figure 4 This is a schematic diagram of the single-start determination unit according to an embodiment of the present invention;

[0075] Figure 5 This is a schematic diagram of the interval time unit according to an embodiment of the present invention;

[0076] Figure 6 This is a schematic diagram of a single failure counting unit according to an embodiment of the present invention;

[0077] Figure 7 This is a schematic diagram of the anti-jump automatic reset unit according to an embodiment of the present invention;

[0078] Figure 8 This is a schematic diagram of the automatic zeroing unit according to an embodiment of the present invention;

[0079] Figure 9 This is a schematic diagram of the start-lock signal unit according to an embodiment of the present invention;

[0080] Figure 10 This is a schematic diagram of the unit interlocking signal unit according to an embodiment of the present invention;

[0081] Figure 11 This is a schematic diagram of the common alarm signal unit according to an embodiment of the present invention;

[0082] Figure 12 This is a schematic diagram of the unit control unit according to an embodiment of the present invention;

[0083] Figure 13 This is a schematic diagram of the manual reset unit according to an embodiment of the present invention;

[0084] Figure 14 This is a schematic diagram of the manual reset unit according to an embodiment of the present invention. Detailed Implementation

[0085] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0086] Example 1

[0087] like Figure 1 As shown, the diesel generator set start-up process monitoring system includes a single start time limit unit 1, a single start judgment unit 2, an interval time unit 3, a single failure counting unit 4, an anti-jump automatic reset unit 5, an automatic zeroing unit 6, a start-up interlock signal unit 7, a generator set interlock signal unit 8, a common alarm signal unit 9, a generator set control unit 10, a manual reset unit 11, and a manual zeroing unit 12.

[0088] like Figure 3 As shown, the single-start time-limiting unit 1 includes a first time relay T1, a normally open contact S-1 (instantaneously closed and instantaneously open) of the start extension relay S, and a second normally open contact T1-2 (instantaneously closed and instantaneously open) of the first time relay T1.

[0089] like Figure 4 As shown, the single-start determination unit 2 includes a third time relay F, a first normally open contact T1-1 of the first time relay T1 (delayed closing and instantaneous opening), and a second normally closed contact R-2 of the running extension relay R (instantaneous opening and instantaneous closing).

[0090] like Figure 5 As shown, the interval time unit 3 includes a second time relay T2;

[0091] like Figure 6 As shown, the single failure counting unit 4 includes a counting relay C and a second normally open contact F-2 (instantaneously closed and instantaneously open) of a third time relay F.

[0092] like Figure 7 As shown, the anti-jump automatic reset unit 5 includes a first normally closed contact R-1 (instantaneous open and instantaneous closed) of the running extension relay R, a normally closed contact T2-1 (delayed open and instantaneous closed) of the second time relay T2, and a first normally open contact F-1 (instantaneous closed and delayed open) of the third time relay F.

[0093] like Figure 8 As shown, the automatic reset unit 6 includes a normally open contact R-3 (instantaneously closed and instantaneously open) of the operating extension relay R.

[0094] like Figure 9As shown, the start-lock signal unit 7 includes a normally open contact T2-2 (instantaneously closed and instantaneously open) of a first control relay P and a second time relay T2.

[0095] like Figure 10 As shown, the unit interlocking signal unit 8 includes a normally open contact C-1 (instantaneously closed and instantaneously open) of the second control relay B and the counting relay C.

[0096] like Figure 11 As shown, the common alarm signal unit 9 includes a third control relay CA, a first normally open contact P-1 (instantaneously closed and instantaneously open) of a first control relay P, and a first normally open contact B-1 (instantaneously closed and instantaneously open) of a second control relay B.

[0097] like Figure 12 As shown, the unit control unit 10 includes a unit controller GCT, a start relay Q, a run relay Y, a start extension relay S, a run extension relay R, a normally open contact CA-1 (instantaneously closed and instantaneously open) of a third control relay CA, a second normally open contact P-2 (instantaneously closed and instantaneously open) of a first control relay P, and a second normally open contact B-2 (instantaneously closed and instantaneously open) of a second control relay B.

[0098] like Figure 13 As shown, the manual reset unit 11 includes a self-resetting normally closed push-button switch RB1;

[0099] like Figure 14 As shown, the manual reset unit 12 includes a self-resetting normally open push button switch RB2.

[0100] The system structure and connection method are as follows:

[0101] like Figure 1 As shown, the single-start timeout unit 1 controls the output state of the single-start determination unit 2 through a single-start timeout signal;

[0102] The single-start determination unit 2 sends the single-start status output signal to the interval time unit 3, the single-failure counting unit 4, and the anti-jump automatic reset unit 5, respectively, to control the next allowed operation time, the single-failure count relay accumulation, and the anti-jump automatic reset of the single-start time limit unit 1.

[0103] The interval time unit 3 outputs a signal to the start-lock signal unit 7, which locks the next start operation when the start operation interval time is insufficient. At the same time, through the signal delay coordination of the single start determination unit 2 and the anti-jump automatic reset unit 5, a time difference for sequential release is formed with the single start time limit unit 1 to avoid the cyclic jump of the automatic reset operation.

[0104] The single failure counting unit 4 sends the signal that the single failure count has exceeded the limit to the unit lockout signal unit 8, and locks the diesel generator set to an unavailable state.

[0105] The anti-jump automatic reset unit 5 sends a delayed coordination signal to the single start time limit unit 1, so that the single start time limit unit 1 and the interval time unit 3 are reset sequentially.

[0106] The automatic zeroing unit 6 sends the diesel generator set operation signal to the single failure counting unit 4, and automatically resets the count when the diesel generator set is running.

[0107] The start-lock signal unit 7 sends the start interval time timing status signal to the unit control unit 10 to lock the start operation, and at the same time provides an alarm input to the common alarm signal unit 9;

[0108] The generator set interlocking signal unit 8 sends a signal indicating that the number of single failures has exceeded the limit to the generator set control unit 10, thereby interlocking the diesel generator set and providing an alarm input to the common alarm signal unit 9.

[0109] The common alarm signal unit 9 will send the start-up interlock signal and the unit interlock signal to the unit control unit 10.

[0110] The generator set control unit 10 sends the diesel generator set start control extension signal and the operating status extension signal to the single start time limit unit 1, while monitoring the diesel generator set operation and providing the current operating status prompt.

[0111] The manual reset unit 11 is connected to the single start time limit unit 1;

[0112] The manual reset unit 12 is connected to the single failure counting unit 4.

[0113] The internal connection methods of each functional unit are as follows:

[0114] like Figure 3 As shown, in the single-start time limit unit 1, the second normally open contact T1-2 of the first time relay T1 is connected in series with the manual reset unit 11, then in parallel with the normally open contact S-1 of the start extension relay S, and finally in series with the anti-jump automatic reset unit 5 to control the first time relay T1.

[0115] like Figure 4 As shown, in the single-start determination unit 2, the first normally open contact T1-1 of the first time relay T1 is connected in series with the second normally closed contact R-2 of the running extension relay R to control the third time relay F.

[0116] like Figure 5 As shown, the interval time unit 3 is controlled by the first normally open contact F-1 of the third time relay F of the anti-jump automatic reset unit 5, which controls the second time relay T2.

[0117] like Figure 6 As shown, in the single failure counting unit 4, the second normally open contact F-2 of the third time relay F controls the counting accumulation of the counting relay C; the automatic clearing unit 6 and the manual clearing unit 12 are connected in parallel to control the counting of the counting relay C to be cleared.

[0118] like Figure 7 As shown, in the anti-jump automatic reset unit 5, the first normally closed contact R-1 of the running extension relay R and the normally closed contact T2-1 of the second time relay T2 are connected in series in the circuit of the single start time limit unit 1; the first normally open contact F-1 of the third time relay F controls the interval time unit 2.

[0119] like Figure 8 As shown, the automatic reset unit 6, the normally open contact R-3 of the running extension relay R is connected in parallel with the manual reset unit 12 to control the single failure counting unit 4;

[0120] like Figure 9 As shown, in the start-lock signal unit 7, the normally open contact T2-2 of the second time relay T2 controls the first control relay P;

[0121] like Figure 10 As shown. In the unit interlocking signal unit 8, the normally open contact C-1 of the counting relay C controls the second control relay B;

[0122] like Figure 11 As shown, in the common alarm signal unit 9, the first normally open contact P-1 of the first control relay P and the first normally open contact B-1 of the second control relay B are connected in parallel to control the third control relay CA.

[0123] like Figure 12 As shown, the unit control unit 10, the unit controller GCT output is connected to the start relay Q and the run relay Y, and is respectively extended to the start extension relay S and the run extension relay R; the second normally open contact P-2 of the first control relay P, the second normally open contact B-2 of the second control relay B, and the normally open contact CA-1 of the third control relay CA are respectively connected to the unit controller GCT.

[0124] like Figure 13 As shown, the manual reset unit 11 and the self-reset normally closed push button switch RB1 are connected to the single start time limit unit 1.

[0125] like Figure 14 As shown, the manual reset unit 12 and the self-reset normally open push button switch RB2 are connected to the single failure counting unit 4.

[0126] The functions of the diesel generator set start-up process monitoring system are described below:

[0127] like Figure 1 and Figure 2 As shown, the functions of the diesel generator set startup monitoring system are as follows:

[0128] (1) Input of start-up operation status judgment condition and unit response: When the diesel generator set starts up, the unit control unit 10 provides the start-up control signal and the operation status signal to the single start-up time limit unit 1; the single start-up time limit unit 1 keeps the start-up duration in time.

[0129] (2) Successful start determination and processing: If the diesel generator set reaches the set operating state within the set time and the diesel generator set operating state signal is valid, the single start determination unit 2 will not have any output change and will continue to maintain the initial reset state. At this time, the single start time limit unit 1 will release and automatically reset, and the automatic clearing unit 6 will automatically clear the single failure counting unit 4 to ensure the correctness of subsequent operation logic.

[0130] (3) Judgment and handling of single start failure: If the start timer expires and the diesel generator set still does not reach the set operating state, the single start timer unit 1 issues an overtime signal, the single start judgment unit 2 confirms and outputs a single start failure signal, the single failure counting unit 4 counts once based on the rising edge signal, and at the same time the interval time unit 3 starts timing the interval time required for the next start operation; within the interval time, the single start timer unit 1 and the single start judgment unit 2 both maintain the failure judgment locked state, the start lockout signal unit 7 maintains the start lockout signal, triggers the common alarm unit 9, and temporarily locks the start operation through the unit control unit 10, while giving an information prompt.

[0131] (4) Cyclic Start-up Attempt: When any single start-up failure is confirmed, the interval time unit 3 automatically starts timing. When the interval duration reaches the set value, the following automatic operations are performed in sequence: the interval time unit 3 sends a signal to reset and self-hold the single start-up time limit unit 1; resets the single start-up determination unit 2 and releases the single start-up failure signal; the interval time unit 3 delays and resets, and feeds back to restore the single start-up time limit unit 1 to its initial state in preparation for the next operation cycle. The delay control realizes the anti-jump reset function, which reliably eliminates the possibility of competition and jump between the single start-up time limit unit 1 and the single start-up determination unit 2; the single start-up failure counting unit 4 is reset in preparation to receive the next rising edge counting signal; the start-up lockout signal unit 7 is reset, and the start-up lockout is released by the unit control unit 10; when the unit controller 10 sends a start-up signal again, the system enters a new single start-up operation judgment and processing process.

[0132] (5) Diesel generator set lockout and handling: When the count value of the single failure counting unit 4 reaches the set number, the action signal of the counting relay C is sent to the generator set lockout signal unit 8, triggering the common alarm signal unit 9, and locking the diesel generator set through the generator set control unit 10, and displaying prompt handling information; when the diesel generator set lockout occurs, the diesel generator set lockout is released through the manual reset unit 12, and the diesel generator set is restored to usable conditions.

[0133] (6) Test function: According to the needs of system maintenance and testing, the manual reset unit 11 provides a manual reset function to manually reset the single start time limit unit 1 and simultaneously release the start lockout; the manual zeroing unit 12 provides manual count zeroing and release of diesel generator set lockout test.

[0134] (7) Parameter coordination: The diesel generator set start-up process monitoring system can be used independently or simultaneously with the start-up settings of the generator set controller GCT. When used simultaneously with the start-up settings of the generator set controller GCT, the parameter coordination relationship is as follows: the delay setting of the first time relay T1 is the same as the start-up duration setting of the generator set controller GCT, which is 15 seconds in this embodiment; the delay setting of the second time relay T2 is the same as the start-up attempt interval of the generator set controller GCT, which is 45 seconds in this embodiment; the cumulative activation value of the counting relay C is the same as the repeated start-up value of the generator set controller GCT, which is 3 times in this embodiment; the delay setting of the third time relay F is not less than 0.5 seconds, which is 1 second in this embodiment.

[0135] like Figure 2 and Figure 3-14 As shown, the specific functions of each unit are described below:

[0136] The single-start timer unit 1 controls the duration of a single start, and the normally open contact S-1 of the start extension relay S provides a start control pulse signal to start the system. The first time relay T1 times the time of each single start operation, and its second normally open contact T1-2 is momentarily closed and momentarily open to perform self-locking control of the timing process.

[0137] The single-start determination unit 2 performs logical judgment to confirm whether the start is successful or not. The first normally open contact T1-1 of the first time relay T1 is delayed and instantaneously open, reflecting the single-start timeout signal. The second normally closed contact R-2 of the running extension relay R is instantaneously open and instantaneously closed, reflecting the operating status of the diesel generator set. The third time relay F reflects the single-start failure signal.

[0138] The interval time unit 3 controls the time interval between single start operations, and the second time relay T2 performs timing measurement.

[0139] The single failure counting unit 4 accumulates the number of single start failures. The counting relay C uses the rising edge of a pulse signal to trigger counting. The second normally open contact F-2 of the third time relay F is momentarily closed and momentarily open to provide a trigger control signal.

[0140] The anti-jump automatic reset unit 5 employs enhanced delay timing logic for the automatic reset repetition process during the cyclic startup attempt. The normally closed contact T2-1 of the second time relay T2 is delayed-open and instantaneously closed. When the operation interval meets the set value, the single-start time limit unit 1 is reset, allowing restart. The first normally closed contact R-1 of the running extension relay R is instantaneously open and instantaneously closed. After the diesel generator set starts successfully, it triggers an automatic reset. The first normally open contact F-1 of the third time relay F is instantaneously closed and delayed-open, causing the reset delay of the second time relay T2 to lag behind that of the first time relay T1.

[0141] The automatic reset unit 6 resets the single failure count. The automatic reset is performed by the normally open contact R-3 of the running extension relay R. The original failure count is automatically reset when the diesel generator set starts successfully.

[0142] The start-lock signal unit 7 provides start-lock control during the cyclic start-up attempt process. The normally open contact T2-2 of the second time relay T2 is momentarily closed and momentarily open. When the start interval time starts to be measured, the first control relay P is triggered to issue a start-lock signal.

[0143] The unit interlock signal unit 8 monitors the number of consecutive starts exceeding the limit. The normally open contact C-1 of the counting relay C is momentarily closed and momentarily open. When the number of starts exceeds the limit, the second controller B is triggered to issue a unit interlock signal.

[0144] The common alarm signal unit 9 summarizes the start-up interlock signal and the unit interlock signal, provides a common alarm signal, and triggers the third control relay CA to issue a common alarm prompt.

[0145] The generator set control unit 10 provides diesel generator set signals to the single-start time-limit unit 1 and controls the diesel generator set according to the start-up status feedback signal. The generator set controller GCT outputs the start-up relay Q and the operation relay Y, and provides operation signals to the single-start time-limit unit 1 through the start-up extension relay S and the operation extension relay R. The control signals of the first control relay P, the second control relay B, and the third control relay CA are input to the generator set controller GCT to control the diesel generator set, and the generator set controller GCT displays alarm prompts.

[0146] The manual reset unit 11 uses the self-resetting normally closed push button switch RB1 to manually reset the single start time limit unit 1 according to the needs of operation and maintenance and testing, thereby triggering the release of the start lockout signal and releasing the start lockout.

[0147] The manual reset unit 12 uses the self-resetting normally open push button switch RB2. When the cumulative number of single start failures exceeds the limit and the diesel generator set is locked, the diesel generator set can be unlocked by manual reset, restoring the diesel generator set to a usable state.

Claims

1. A diesel generator set start-up process monitoring system, characterized in that: It includes a single start time limit unit, a single start judgment unit, an interval time unit, a single failure counting unit, an anti-jump automatic reset unit, an automatic zeroing unit, a start interlock signal unit, a unit interlock signal unit, a common alarm signal unit, a unit control unit, a manual reset unit, and a manual zeroing unit; The single-start time limit unit includes a first time relay T1, a normally open contact S-1 of the start extension relay S, and a second normally open contact T1-2 of the first time relay T1. The single-start determination unit includes a third time relay F, a first normally open contact T1-1 of a first time relay T1, and a second normally closed contact R-2 of a running extension relay R. The interval time unit includes a second time relay T2; The single failure counting unit includes a counting relay C and a second normally open contact F-2 of a third time relay F; The anti-jump automatic reset unit includes a first normally closed contact R-1 of the operating extension relay R, a normally closed contact T2-1 of the second time relay T2, and a first normally open contact F-1 of the third time relay F. The automatic reset unit includes a normally open contact R-3 of the operating extension relay R; The start-lock signal unit includes a normally open contact T2-2 of a first control relay P and a second time relay T2; The unit interlocking signal unit includes the normally open contact C-1 of the second control relay B and the counting relay C; The common alarm signal unit includes a third control relay CA, a first normally open contact P-1 of a first control relay P, and a first normally open contact B-1 of a second control relay B. The unit control unit includes a unit controller GCT, a start relay Q, a run relay Y, a start extension relay S, a run extension relay R, a normally open contact CA-1 of a third control relay CA, a second normally open contact P-2 of a first control relay P, and a second normally open contact B-2 of a second control relay B. The manual reset unit includes a self-resetting normally closed push-button switch RB1; The manual reset unit includes a self-resetting normally open push button switch RB2; The interval time unit outputs a signal to the start-lock signal unit, which locks the next start operation when the start operation interval time is insufficient. At the same time, through the signal delay coordination of the single start determination unit and the anti-jump automatic reset unit, a time difference is formed between the single start time limit unit and the single start time limit unit to release sequentially, thereby avoiding the cyclic jump of the automatic reset operation. The start-up interlock signal unit sends the start-up interval timer status signal to the unit control unit to interlock the start-up operation, and at the same time provides an alarm input to the common alarm signal unit. The generator set interlock signal unit sends a signal indicating that the number of single failures has exceeded the limit to the generator set control unit, thereby interlocking the diesel generator set, and simultaneously provides an alarm input to the common alarm signal unit. The common alarm signal unit: summarizes the start-up interlock signal and the unit interlock signal and sends them to the unit control unit.

2. The diesel generator set start-up process monitoring system according to claim 1, characterized in that, The single-start timeout unit controls the output state of the single-start determination unit via a single-start timeout signal. The single-start determination unit sends the single-start status output signal to the interval time unit, the single-failure counting unit, and the anti-jump automatic reset unit, respectively, to control the next allowed operation time, the single-failure count relay accumulation, and the anti-jump automatic reset of the single-start time limit unit. The single failure counting unit sends a signal indicating that the cumulative number of single failures has exceeded the limit to the unit interlocking signal unit, thereby locking the diesel generator set into an unavailable state. The anti-jump automatic reset unit sends a delayed coordination signal to the reset operation of the single-start time limit unit, so that the single-start time limit unit and the interval time unit are reset sequentially. The automatic zeroing unit sends the unit's operating signal to the single failure counting unit, and automatically resets the count when the diesel generator set is running. The generator set control unit sends the diesel generator set start control extension signal and the operating status extension signal to the single start time limit unit, while monitoring the diesel generator set operation and providing current operating status prompts. The manual reset unit is connected to the single-start timeout unit. The manual reset unit is connected to the single failure counting unit.

3. The diesel generator set start-up process monitoring system according to claim 1 or 2, characterized in that, The single-start time limit unit: the second normally open contact T1-2 of the first time relay T1 is connected in series with the manual reset unit, then in parallel with the normally open contact S-1 of the start extension relay S, and then in series with the anti-jump automatic reset unit to control the first time relay T1; The single-start determination unit: the first normally open contact T1-1 of the first time relay T1, connected in series with the second normally closed contact R-2 of the running extension relay R, controls the third time relay F; The interval time unit is controlled by the first normally open contact F-1 of the third time relay F of the anti-jump automatic reset unit, which controls the second time relay T2. The single failure counting unit: the second normally open contact F-2 of the third time relay F controls the counting accumulation of the counting relay C; the automatic clearing unit and the manual clearing unit are connected in parallel to control the counting of the counting relay C to be cleared; The anti-jump automatic reset unit: the first normally closed contact R-1 of the running extension relay R and the normally closed contact T2-1 of the second time relay T2 are connected in series in the circuit of the single start time limit unit; the first normally open contact F-1 of the third time relay F controls the interval time unit. The automatic reset unit: The normally open contact R-3 of the running extension relay R is connected in parallel with the manual reset unit to control the single failure counting unit; The start-lock signal unit: the normally open contact T2-2 of the second time relay T2 controls the first control relay P; The unit interlocking signal unit: the normally open contact C-1 of the counting relay C controls the second control relay B; The common alarm signal unit: the first normally open contact P-1 of the first control relay P and the first normally open contact B-1 of the second control relay B are connected in parallel to control the third control relay CA; The unit control unit: The output of the unit controller GCT is connected to the start relay Q and the run relay Y, and is respectively extended to the start extension relay S and the run extension relay R; the second normally open contact P-2 of the first control relay P, the second normally open contact B-2 of the second control relay B, and the normally open contact CA-1 of the third control relay CA are respectively connected to the unit controller GCT. The manual reset unit: The self-reset normally closed push button switch RB1 is connected to the single start time limit unit; The manual reset unit: The self-reset normally open push button switch RB2 is connected to the single failure counting unit.

4. The diesel generator set start-up process monitoring system according to claim 3, characterized in that, The job duties are as follows: (1) Input of start-up operation status judgment condition and unit response: When the diesel generator set starts up, the unit control unit provides the start-up control signal and the operation status signal to the single start-up time limit unit; the single start-up time limit unit keeps track of the start-up duration. (2) Successful start determination and processing: If the diesel generator set reaches the set operating state within the set time and the diesel generator set operating state signal is valid, the single start determination unit will not change its output and will continue to maintain the initial reset state. At this time, the single start time limit unit will release and reset automatically, and the automatic clearing unit will automatically clear the single failure counting unit to ensure the correctness of subsequent operation logic. (3) Judgment and handling of single start failure: If the start timer expires and the diesel generator set still does not reach the set operating state, the single start time limit unit sends an overtime signal, and the single start judgment unit confirms and outputs a single start failure signal. The single failure counting unit counts once based on the rising edge signal, and at the same time, the interval time unit starts timing the interval time required for the next start operation. Within the interval time, the single start time limit unit and the single start judgment unit both maintain the failure judgment locked state. The start lockout signal unit maintains the start lockout signal, triggers the common alarm signal unit, and temporarily locks the start operation of the diesel generator set through the unit control unit, while giving an information prompt. (4) Cyclic Start-up Attempt: When any single start-up failure is confirmed, the interval time unit automatically starts timing. When the interval duration reaches the set value, the following automatic operations are performed in sequence: The interval time unit sends a signal to reset and self-hold the single start-up time limit unit; the single start-up determination unit is reset and the single start-up failure signal is released; the interval time unit is delayed and reset, and feedback is given to restore the single start-up time limit unit to its initial state in preparation for the next operation cycle. The delay control realizes the anti-jump reset function, which reliably eliminates the possibility of competition and jump between the single start-up time limit unit and the single start-up determination unit; the single start-up failure counting unit is reset in preparation to receive the next rising edge counting signal; the start-up lockout signal unit is reset and the start-up lockout is released through the unit control unit; when the unit control unit sends a start-up signal again, the system enters a new single start-up operation judgment and processing process. (5) Unit lockout and handling: When the count value of the single failure counting unit reaches the set number, the action signal of the counting relay C is sent to the unit lockout signal unit to trigger the common alarm signal unit, and the diesel generator set is locked out through the unit control unit, and the prompt handling information is displayed; when the diesel generator set lockout occurs, the diesel generator set lockout is released through the manual reset unit to restore the diesel generator set to usable conditions. (6) Testing: As needed for system maintenance and testing, the manual reset unit provides a manual reset function to manually reset the single start time limit unit and simultaneously release the start lockout of the diesel generator set; the manual zeroing unit provides manual count zeroing and release of the diesel generator set lockout test. (7) Parameter coordination: The diesel generator set start-up process monitoring system can be used independently or simultaneously with the start-up settings of the generator set controller GCT. When used simultaneously with the start-up settings of the generator set controller GCT, the parameter coordination relationship is as follows: the delay setting of the first time relay T1 is the same as the start-up duration setting of the generator set controller GCT; the delay setting of the second time relay T2 is the same as the start-up attempt interval of the generator set controller GCT; the cumulative setting of the number of times the counting relay C is activated is the same as the repeated start-up number setting of the generator set controller GCT; and the delay setting of the third time relay F is not less than 0.5 seconds.

5. The diesel generator set start-up process monitoring system according to claim 3, characterized in that: The single-start time limit unit controls the duration of a single start, and the normally open contact S-1 of the start extension relay S provides a start control pulse signal to start the system. The first time relay T1 times the time of each single start operation, and its second normally open contact T1-2 is momentarily closed and momentarily open to perform self-locking control of the timing process. The single-start determination unit performs logical judgment to confirm whether the start is successful or not. The first normally open contact T1-1 of the first time relay T1 is delayed and instantaneously open, reflecting the single-start timeout signal; the second normally closed contact R-2 of the running extension relay R is instantaneously open and instantaneously closed, reflecting the operating status of the diesel generator set; the third time relay F reflects the single-start failure signal. The interval time unit controls the time interval between single start operations, and the second time relay T2 performs timing measurement. The single failure counting unit accumulates the number of single startup failures. The counting relay C is triggered by the rising edge of a pulse signal. The second normally open contact F-2 of the third time relay F is momentarily closed and momentarily open to provide a trigger control signal. The anti-jump automatic reset unit employs enhanced delay timing logic for the repeated automatic reset process during the cyclic startup attempt. The normally closed contact T2-1 of the second time relay T2 is delayed-open and momentarily closed. When the operation interval meets a set value, the single-start time limit unit is reset, allowing restart. The first normally closed contact R-1 of the running extension relay R is momentarily open and momentarily closed, triggering automatic reset after successful diesel generator start-up. The first normally open contact F-1 of the third time relay F is momentarily closed and delayed-open, causing the reset delay of the second time relay T2 to lag behind that of the first time relay T1. The automatic reset unit resets the single failure count to zero. The automatic reset is performed by the normally open contact R-3 of the running extension relay R. The original failure count is automatically reset to zero when the diesel generator set starts successfully. The start-lock signal unit provides start-lock control during the cyclic start-up attempt process. The normally open contact T2-2 of the second time relay T2 is momentarily closed and momentarily open. When the start interval time starts to be measured, the first control relay P is triggered to issue a start-lock signal. The unit interlock signal unit monitors the number of consecutive starts exceeding the limit. The normally open contact C-1 of the counting relay C is momentarily closed and momentarily open. When the number of starts exceeds the limit, the second control relay B is triggered to issue a unit interlock signal. The common alarm signal unit summarizes the start-up interlock signal and the unit interlock signal, provides a common alarm signal, and triggers the third control relay CA to issue a common alarm prompt. The generator control unit provides diesel generator signals to the single-start time-limit unit and controls the diesel generator according to the start-up status feedback signal. The generator controller GCT output is connected to the start relay Q and the running relay Y, and provides operation signals to the single-start time-limit unit through the start extension relay S and the running extension relay R. The control signals of the first control relay P, the second control relay B, and the third control relay CA are input to the generator set controller GCT to control the diesel generator set, and the alarm prompts are displayed through the generator set controller GCT. The manual reset unit uses the self-resetting normally closed push button switch RB1 to manually reset the single start time limit unit according to the needs of operation, maintenance and testing, thereby triggering the release of the start lockout signal and releasing the start lockout. The manual reset unit uses the self-resetting normally open push button switch RB2. When the cumulative number of single start failures exceeds the limit and the diesel generator set is locked, the diesel generator set can be unlocked by manual reset, restoring the diesel generator set to a usable state.

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