CN103528087A - Method for resisting low voltage fault of coal feeder - Google Patents
Method for resisting low voltage fault of coal feeder Download PDFInfo
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- CN103528087A CN103528087A CN201310450038.4A CN201310450038A CN103528087A CN 103528087 A CN103528087 A CN 103528087A CN 201310450038 A CN201310450038 A CN 201310450038A CN 103528087 A CN103528087 A CN 103528087A
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- feeder
- low voltage
- frequency converter
- relay
- fault
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Abstract
The invention discloses a method for resisting a low voltage fault of a coal feeder. The method is characterized by including the steps of adding a power supply detection relay to the input power supply portion of the coal feeder in parallel, enabling an output node of the relay to be connected to a fault output node of a frequency converter in series, keeping detecting whether the voltage of a power supply is normal or not when the coal feeder runs, sending a detected fault occurrence signal to a microcomputer control system of the coal feeder when the low voltage fault occurs, not giving out a shut-down instruction through program judgment, maintaining all working states embodied before the fault occurs, automatically conducting self-recovery to start the frequency converter after the low voltage fault is eliminated, meanwhile, giving out an instruction for maintaining the feedback coal amount for a period of time through a control program, maintaining the feedback coal amount embodied before the fault occurs, and switching the feedback coal amount to an actual value when the low voltage fault is eliminated. According to the method, when the low voltage fault occurs, the coal feeder is not shut down, automatic recovery and starting of the coal feeder can be achieved without on-site man-made interference, and the coal feeder has the short-time continuous running capacity.
Description
Technical field
The solution that the present invention relates to a kind of feeder opposing low voltage failure, belongs to boiler technology field.
Background technology
Feeder, as the coal handling plant matching with coal pulverizer in power plant boiler pulverized coal preparation system, is embodied as continuous, the accurate and uniform coal supply of coal pulverizer, to meet boiler load, realizes safety in production.The safe and stable operation of feeder directly has influence on the performance of boiler and the production safety of thermal power plant.Feeder in the past, all can fault chaser when being subject to low voltage failure and disturbing, and has very large potential safety hazard.
The low voltage failure of thermal power plant generally occurs in inside or outside (thunderbolt, electrical equipment short circuit or ground connection etc.); capital causes that station service short time voltage reduces; when low voltage failure occurs; frequency converter under-voltage protection meeting action; now frequency converter, in blocking, stops output, causes feeder motor stalling; when feeder velocity-measuring system can't detect motor speed, coal feeder control system can automatically be judged to be stall fault and force to send the instruction of feeder chaser.Feeder fault chaser, need to arrive the on-the-spot artificial chaser fault of getting rid of of feeder, eliminates after chaser signal, could again start operation.
When low voltage failure occurs, in the time of feeder stall, can not bring adverse consequences to boiler combustion, be a coal storage container because coal pulverizer, power transportation pipe that feeder lower end connects can be regarded as, and within of short duration several seconds, can not cause the interruption of boiler-burner fuel.In fact feeder is in running, and the existing picture of drive motors stall still has, such as belt in short-term by foreign matter bite once, will cause defeated coal break in short-term.Drive motors, after pausing, can be broken through and remained in operation by jam power under the effect of frequency converter.In the time of stall, the feedback coal amount of feeder can drop into zero-bit, although after low voltage failure is eliminated, feedback coal amount can automatically restore to the state before fault, but boiler combustion regulates from zero-bit and starts to regulate, there will be over control in short-term, can produce certain disturbance to system.
Summary of the invention
To be solved by this invention is defect and the interference defect of feedback quantity overshoot to system of existing feeder chaser when low voltage failure.
In order to address the above problem, the invention provides a kind of solution of feeder opposing low voltage failure, it is characterized in that, concrete steps are as follows:
The first step: be installed in parallel power supply detection relay at feeder input power interchange 380V and frequency converter input power place; a control relay is installed at fault output normally opened contact place at frequency converter; again one end of the normally opened contact on this control relay is connected with the common point on feeder power panel; the other end is connected with low-voltage action normally opened contact one end that power supply detects on relay, and the other end that power supply detects the low-voltage action normally opened contact on relay is connected with the motor start-up point on feeder power panel;
Second step: when input power occurs when abnormal; power supply detects the action of relay low-voltage; it is closed that power supply detects relay normally open contact; the output of frequency converter low-voltage lockout; the fault output normally opened contact action of frequency converter; control relay normally opened contact is closed; make conducting between common point on power panel and motor start-up point; feeder control program judges it is now low voltage failure and do not send chaser instruction; maintain the work in every state before fault, wait for that the rear frequency converter of low voltage failure elimination is from resuming operation; When frequency converter is after recovering startup, node on the frequency converter closure of just transferring from a team to another, when feeder control program detects node forward closure, control program sends feeder and starts run signal, and feeder is from resuming operation, simultaneously, between common point on feeder power panel and motor start-up point, during conducting, control program sends the instruction that maintains feedback coal amount a period of time, maintains the feedback coal amount before fault occurs, after low voltage failure is eliminated, feedback coal amount is switched to actual value again.
The present invention is installed power supply additional in the parallel connection of feeder input power part to detect relay, the output node series connection of this relay is being linked into frequency converter failure output node, the object of above two signals of series connection is the misoperations that cause due to other fault in order to filter, when power supply detects relay and frequency converter failure output successively after action, just can detect low voltage failure and really occur, the fault-signal detecting is linked into coal feeder control system by the node on power panel.
When low voltage failure occurs, frequency converter output locking, stops output, causes feeder motor stalling, and when original coal feeder control system can't detect motor speed and reaches certain hour, control system can send the instruction of fault chaser, and order feeder is shut down.Because feeder is under chaser state, after low voltage failure is eliminated, feeder is self-starting operation again also, need to arrive on-the-spot this fault of eliminating of feeder, eliminate fault chaser signal, otherwise feeder cannot start again.Because the duration of the low voltage failure of thermal power plant is all extremely short, coal feeder control system chaser not when guaranteeing that low-voltage occurs, the running status before keeping, or wait for that low voltage failure eliminates, feeder self-starting operation again.Our solution is when feeder work moves for this reason, whether normally constantly detects supply voltage, when low voltage failure occurs, the fault-signal detecting is sent into feeder Control System of Microcomputer.Now by program, judged and do not sent chaser instruction, maintain the work in every state before fault, when low voltage failure is eliminated, frequency converter is from recovering startup, and feeder receives after the enabling signal of frequency converter, just can be again from recovering to start operation.When the low voltage failure duration utmost point in short-term, feeder also can complete above-mentioned action from recover starting operation in the very first time, very little on the impact of boiler-burner.Realized feeder chaser not when low voltage failure, in short-term the ability of operation continuously.
Feeder low voltage failure is because motor is in stop state, can cause feedback coal amount to drop into zero, the state before although low voltage failure can automatically restore to after eliminating, but automatically regulate because feedback starts to regulate from zero-bit, there will be over control in short-term, can allow operations staff not feel well, also can cause certain disturbance to system.For this reason, can, low voltage failure generation being detected, when coal feeder control system does not send chaser instruction, by feeder programme-control, maintain feedback coal amount (virtual amount) certain hour t at that time
y, t
ytime is set as 5 seconds.If low-voltage starts time to power up lower than t
y, feeder adjusting device will exit this virtual amount automatically, steadily be switched in actual feedback amount, will drop to minimum like this to the disturbance of system.If low-voltage starts to be greater than t to the time of power up
y, t
yafter time is up, the feedback of virtual amount disappears.
When low voltage failure occurs, feeder control section also can be subject to supply voltage to be reduced and out-of-work impact.Coal feeder control system Power supply can adopt station-service ups power or use AC voltage regulator power supply instead, to guarantee the normal operation of coal feeder control system within a period of time.
The invention has the advantages that:
1. when low voltage failure occurs, feeder is chaser not, without artificial disturbance on the spot, can realize feeder from recovering to start operation, possesses in short-term service ability continuously.
2. do not change the original structure of feeder and every technical performance, have very high transformation versatility.
3. transformation is simple, and improvement expenses is cheap, has good simplicity and economy.
4. without installing other auxiliary device additional, later maintenance workload also reduces greatly again.
Accompanying drawing explanation
Fig. 1 is the electric diagram of the solution of feeder opposing low voltage failure provided by the invention.
The specific embodiment
For the present invention is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
Embodiment
As shown in Figure 1, for feeder provided by the invention is subject to the electric diagram of the solution of low voltage failure, in order to realize feeder opposing low voltage failure, disturb not chaser, at feeder input power interchange 380V and frequency converter VFD input power place, be installed in parallel power supply detection relay DJ, fault output normally opened contact R2 at frequency converter VFD, a control relay XZJ is installed at R3 place, again one end of the normally opened contact on this control relay XZJ is connected with the common point COM on feeder power panel PS, the other end is connected with low-voltage action normally opened contact RO one end that power supply detects on relay DJ, the low-voltage action normally opened contact other end COM that power supply detects on relay DJ is connected with the motor start-up point MSF on feeder power panel PS.
When input power occurs when abnormal, power supply detects the action of relay DJ low-voltage, power supply detects relay normally open contact RO, COM is closed, the output of frequency converter VFD low-voltage lockout, the fault output normally opened contact R2 of frequency converter VFD, R3 action, the normally opened contact XZJ of control relay XZJ is closed, make conducting between common point COM on power panel PS and motor start-up point MSF, feeder control program judges it is now low voltage failure and do not send chaser instruction, maintain the work in every state before fault, after waiting for low voltage failure elimination, frequency converter VFD is from resuming operation, when frequency converter VFD is after recovering startup, node 1ZJ on the frequency converter VFD closure of just transferring from a team to another, when feeder control program detects node 1ZJ forward closure, control program sends feeder and starts run signal, feeder is from resuming operation, simultaneously, between common point COM on feeder power panel PS and motor start-up point MSF during conducting, control program sends the instruction that maintains feedback coal amount a period of time, maintain the feedback coal amount before fault occurs, after low voltage failure is eliminated, feedback coal amount is switched to actual value again.
Claims (1)
1. a solution for feeder opposing low voltage failure, is characterized in that, concrete steps are as follows:
The first step: be installed in parallel power supply detection relay (DJ) at feeder input power interchange 380V and frequency converter (VFD) input power place, fault output normally opened contact (R2 at frequency converter (VFD), R3) locate to install a control relay (XZJ), again one end of the normally opened contact on this control relay (XZJ) is connected with the common point (COM) on feeder power panel (PS), the other end is connected with low-voltage action normally opened contact (RO) one end that power supply detects on relay (DJ), the other end (COM) that power supply detects the low-voltage action normally opened contact on relay (DJ) is connected with the motor start-up point (MSF) on feeder power panel (PS),
Second step: when input power occurs when abnormal, power supply detects the action of relay (DJ) low-voltage, power supply detects relay normally open contact (RO, COM) closure, the output of frequency converter (VFD) low-voltage lockout, the fault output normally opened contact (R2 of frequency converter (VFD), R3) action, control relay (XZJ) normally opened contact is closed, make conducting between common point (COM) on power panel (PS) and motor start-up point (MSF), feeder control program judges it is now low voltage failure and do not send chaser instruction, maintain the work in every state before fault, after waiting for low voltage failure elimination, frequency converter (VFD) resumes operation certainly, after frequency converter (VFD) recovers to start certainly, node (1ZJ) on frequency converter (VFD) closure of just transferring from a team to another, when feeder control program detects node (1ZJ) forward closure, control program sends feeder and starts run signal, feeder is from resuming operation, simultaneously, between common point (COM) on feeder power panel (PS) and motor start-up point (MSF) during conducting, control program sends the instruction that maintains feedback coal amount a period of time, maintain the feedback coal amount before fault occurs, after low voltage failure is eliminated, feedback coal amount is switched to actual value again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310450038.4A CN103528087B (en) | 2013-09-27 | 2013-09-27 | The solution of a kind of feeder opposing low voltage failure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310450038.4A CN103528087B (en) | 2013-09-27 | 2013-09-27 | The solution of a kind of feeder opposing low voltage failure |
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| CN103528087A true CN103528087A (en) | 2014-01-22 |
| CN103528087B CN103528087B (en) | 2016-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680446A (en) * | 2016-03-23 | 2016-06-15 | 中国神华能源股份有限公司 | Device and method for preventing tripping during power switching of coal feeder |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202652141U (en) * | 2012-05-25 | 2013-01-02 | 陕西金源自动化科技有限公司 | Coal feeder frequency converter low voltage crossover device |
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2013
- 2013-09-27 CN CN201310450038.4A patent/CN103528087B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202652141U (en) * | 2012-05-25 | 2013-01-02 | 陕西金源自动化科技有限公司 | Coal feeder frequency converter low voltage crossover device |
Non-Patent Citations (2)
| Title |
|---|
| 刘德诚: "给煤机微机控制系统低电压跳闸事故分析及改造", 《内蒙古电力技术》 * |
| 毕明波、吴斌: "给煤机低电压扰动跳闸原因分析与改进", 《内蒙古电力技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680446A (en) * | 2016-03-23 | 2016-06-15 | 中国神华能源股份有限公司 | Device and method for preventing tripping during power switching of coal feeder |
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| CN103528087B (en) | 2016-06-01 |
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