CN201898476U - Automatic power frequency switching device for preventing unexpected halt of motor - Google Patents
Automatic power frequency switching device for preventing unexpected halt of motor Download PDFInfo
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- CN201898476U CN201898476U CN2010202985081U CN201020298508U CN201898476U CN 201898476 U CN201898476 U CN 201898476U CN 2010202985081 U CN2010202985081 U CN 2010202985081U CN 201020298508 U CN201020298508 U CN 201020298508U CN 201898476 U CN201898476 U CN 201898476U
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- frequency converter
- motor
- circuit breaker
- side circuit
- frequency
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Abstract
The utility model relates to an automatic power frequency switching device for preventing an unexpected halt of a motor, which belongs to the field of control of a power generator and comprises a frequency converter. One end of the frequency converter is connected with the motor, and the other end is connected with a bus by a circuit breaker. The frequency converter is connected in parallel with a bypass circuit breaker. The two ends of a branch where the frequency converter is located are respectively connected in series with a network-side circuit breaker and a motor-side circuit breaker. When the frequency converter works, the rotating speed of the motor can be changed to carry out flow regulation. When the frequency converter breaks down and stops working, a CPU (central processing unit) can automatically carry out judgment and a series of actions: the network-side circuit breaker and the motor-side circuit breaker are switched off; a ventilating baffle at an outlet is automatically and quickly closed according to the preset corresponding relationship between the current unit load and the ventilating baffle at the outlet; when the difference between the closing value of the ventilating baffle and the set value is smaller than 15% and the acting time is longer than 2 seconds, the bypass circuit breaker is switched on, the motor is switched to work under a bypass power frequency and then the normal running of equipment is realized.
Description
[technical field]
The utility model belongs to the Motor Control field, more particularly, relates to a kind of power frequency automatic switching control equipment that prevents the motor hang-up.
[background technology]
At present, the high-power subsidiary engine of China's boiler of power plant high problem of ubiquity power consumption that is in operation.Domesticly widely apply variable-frequency governor at the subsidiary engine of building unit and newly-built unit, generally only adopt pure converting operation mode, make that equipment power dissipation reduces, operational efficiency improves, station service power consumption rate reduces, energy-saving effect is remarkable.Frequency converter is to utilize the on-off action of power semiconductor device power frequency supply to be transformed to the electric energy control device of different frequency, it mainly is made of two parts circuit, the one, main circuit (rectification module, electrochemical capacitor and inversion module), the 2nd, control circuit (Switching Power Supply plate, control circuit board).CPU just is installed on the control circuit board, and the function software burning of frequency converter is on CPU, and the frequency converter software of same model is fixed.Converter technique has been widely used on industry and the civilian power consumption equipment at present.
Because frequency converter device structure complexity, parts are more, caloric value is big, the probability that breaks down that is in operation still exists, and especially at the operation initial stage, fault is more relatively, and frequency converter is protection motor and frequency converter self after breaking down, must tripping operation.But the frequency converter tripping operation means that whole dragging system quits work, and causes the stopping accident of unit, causes very big security threat and serious economy loss.
[utility model content]
The purpose of this utility model is to cause the favourable turn stall after the frequency conversion fault; thereby cause generating set tripping operation accident; a kind of power frequency automatic switching control equipment that prevents the electrical equipment hang-up is provided; the method that adopts hardware and software to combine; after the frequency converter tripping operation; carry out a series of subsequent actions, make electrical equipment automatically switch to power frequency operation, make unit safety normally operation reliably.
The utility model solves the problems of the technologies described above by the following technical programs: the power frequency automatic switching control equipment that prevents the electrical equipment hang-up; comprise frequency converter; described frequency converter one termination motor; the other end is by the circuit breaker connection bus; described frequency converter is in parallel with bypass breaker, and branch road two ends, described frequency converter place are connected in series net side circuit breaker and motor side circuit breaker respectively.
Principle of the present utility model is: the utility model passes through the existing equipment transformation, change the by-pass knife switch of conventional design into by-pass switch, the change isolation switch is the circuit breaker of satisfying the demand, and take into full account the equipment operation characteristics, in cyclelog, carry out programming in a suitable manner, each circuit breaker and outlet air deflector position behind calculating and the judgement frequency converter failure, accurately control restricting relation between each equipment, Reasonable Orientation outlet air deflector, pool safety is switched the time local with reliable switching.During the frequency converter operation, the outlet air deflector places the maximum stream flow aperture, carries out Flow-rate adjustment by frequency converter by changing motor speed; When frequency converter breaks down and stop transport, CPU judges automatically according to control logic, carry out a series of actions: disconnect net side circuit breaker and motor side circuit breaker, according to the corresponding relation between predefined current unit load and the outlet air deflector, automatically quick closedown exports air deflector, when this flapper closure to the deviation of set point less than 15%, judge that simultaneously operate time is greater than after 7 seconds, closed bypass breaker, switch to the bypass power frequency operation, equipment is run well, afterwards flow control is controlled by the outlet air deflector, satisfy the unit needs, prevent that the unit outage accident from taking place.
Advantage of the present utility model is: the utility model is compared with existing general frequency conversion renovation technique, has increased the switching of auto by pass, can effectively avoid the tripping operation of equipment behind the frequency converter failure, has guaranteed the safe and stable operation of unit.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is circuit theory diagrams of the present utility model,
Fig. 2 is the parameter change curve of the utility model in handoff procedure,
Fig. 3 is the utility model frequency converter function group starting program flow diagram,
Fig. 4 is the utility model outlet damper Automatic Control Theory figure,
Fig. 5 drops into logic relation picture automatically for the bypass of the utility model frequency converter.
[embodiment]
As shown in Figure 1: modern large-sized boiler all is two forced draft fan (or two induced draft fan and bilateral primary air fan) paired runnings, for 6KV control motor, is example with the forced draft fan, is divided into A side forced draft fan M
aWith B side forced draft fan M
bPrevent the power frequency automatic switching control equipment of blower fan hang-up, comprise frequency converter 1
a, 1
b, frequency converter 1
aOne termination A side forced draft fan motor M
a, the other end is by circuit breaker Q F
aConnection bus, frequency converter 1
aWith bypass breaker QF1
aParallel connection, and frequency converter 1
aBranch road two ends, place are connected in series net side circuit breaker Q F2 respectively
aWith motor side circuit breaker Q F3
aFrequency converter 1
bOne termination motor M
b, the other end is by circuit breaker Q F
bConnection bus, frequency converter 1
bWith bypass breaker QF1
bParallel connection, and frequency converter 1
bBranch road two ends, place are connected in series net side circuit breaker Q F2 respectively
bWith motor side circuit breaker Q F3
b
Above-mentioned 6KV generating set carries out static test after practice of construction and program compilation are finished, the simulation actual moving process, and the sequence starting favourable turn, the condition under the simulation different load operating mode drops into the bypass interlocking, excision frequency converter 1 when stable state
a, interlocked control is moved immediately, disconnects net side circuit breaker Q F2
aWith motor side circuit breaker Q F3
a, close the outlet air deflector to 23.3% after, closed bypass breaker QF1
a, switch to the bypass operation, the fan delivery control stabilization, fluctuation is satisfied the demand within reasonable safe range fully.
This device once took place because of forced draft fan frequency conversion fault after dropping into commencement of commercial operation, generating set load 369MW at that time, B forced draft fan frequency converter 1
bModule is because of the high tripping operation of temperature, and each equipment is carried out according to preset program immediately, frequency converter 1
bTripping operation back B crosswind machine outlet damper closes to 23.3% from 85% immediately, regulates making A side forced draft fan M automatically
aFrequency conversion increases to 29.02Hz by 22Hz, afterwards B side bypass breaker QF1
bClosure, B side forced draft fan M
bSwitch to power frequency operation.In this process, boiler furnace pressure oscillation scope for-189Pa～241Pa (the protection of boiler during shutdown period operating value is-2500Pa～2500Pa), unit load is stable, design sketch is as shown in Figure 2.Give thereafter, induced draft fan is again repeatedly because of frequency converter failure automaticallyes switch, all action is correct, jumping machine accident does not break down.Facts have proved that this device is a mature and reliable.
Generating set is added up the electric quantity loss that restarts and trip and caused behind each unit tripping, its direct economic loss is about more than 1,500,000 yuan.If reduce the equipment life of considering unit tripping again and being caused, and for the influence of power grid security and the scheduling credit rating to company, its influence is bigger.Therefore this technology produced economic benefit and social benefit will be huge.
Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that under the situation that does not break away from principle of the present utility model and spirit and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is limited by claims and equivalent thereof.
Claims (1)
1. prevent the power frequency automatic switching control equipment of motor hang-up; comprise frequency converter; described frequency converter one termination motor; the other end is by the circuit breaker connection bus; it is characterized in that: described frequency converter is in parallel with a bypass breaker, and branch road two ends, described frequency converter place are connected in series net side circuit breaker and motor side circuit breaker respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202985081U CN201898476U (en) | 2010-08-13 | 2010-08-13 | Automatic power frequency switching device for preventing unexpected halt of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202985081U CN201898476U (en) | 2010-08-13 | 2010-08-13 | Automatic power frequency switching device for preventing unexpected halt of motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201898476U true CN201898476U (en) | 2011-07-13 |
Family
ID=44256359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202985081U Expired - Fee Related CN201898476U (en) | 2010-08-13 | 2010-08-13 | Automatic power frequency switching device for preventing unexpected halt of motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201898476U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951017A (en) * | 2010-08-13 | 2011-01-19 | 蚌埠市禹源环保科技有限公司 | Power frequency automatic switching device for preventing unplanned shutdown of motor |
-
2010
- 2010-08-13 CN CN2010202985081U patent/CN201898476U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951017A (en) * | 2010-08-13 | 2011-01-19 | 蚌埠市禹源环保科技有限公司 | Power frequency automatic switching device for preventing unplanned shutdown of motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110713 Termination date: 20120813 |