CN201733274U - Loop current detection and control device for intelligent static phase advancer - Google Patents
Loop current detection and control device for intelligent static phase advancer Download PDFInfo
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- CN201733274U CN201733274U CN2010201002529U CN201020100252U CN201733274U CN 201733274 U CN201733274 U CN 201733274U CN 2010201002529 U CN2010201002529 U CN 2010201002529U CN 201020100252 U CN201020100252 U CN 201020100252U CN 201733274 U CN201733274 U CN 201733274U
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Abstract
The utility model relates to a loop current detection and control device for an intelligent static phase advancer, which comprises an AC-AC converter, an alternating current transformer and an intelligent controller. The AC-AC converter comprises a main power transformer (B1), a high-power thyristor, a reactor, a protective capacitor, a protective resistor, a three-phase busbar outputting to a motor rotor and the like, wherein the alternating current transformer is installed on the primary side of the main power transformer and connected with the intelligent controller through a transmission lead, the intelligent controller is connected with a 380-V main power source, and further a signal input interface, a signal output interface and a thyristor triggering signal output interface are provided. The loop current detection and control device is mainly characterized in that the alternating current transformer is adopted to detect loop current of the AC-AC converter. The loop current detection and control device is simple in structure, flexile in detection and control, high in reliability, safe in running and low in cost, and solves the problems of complicated structure, low accuracy and poor reliability in detection of loop currents by traditional Hall sensor means.
Description
Affiliated technical field
The utility model belongs to electrical and control technology field, relating to a kind of intelligent static formula phase advancer and detect and control device with circulation, is a kind of for the main power device in the intelligent static formula phase advancer---the detection of the circulation that friendship alternating flow device is produced when working and the device of control.
Background technology
Intelligent static formula phase advancer is a kind of in-situ reactive power compensation equipment that big-and-middle-sized power wire wound asynchronous motor designs and produces that aims at.Its operation principle is that wire wound asynchronous motor is when operation, intelligent static formula phase advancer is serially connected in the rotor loop of motor and works, provide by the electric current of handing over the generation of alternating flow device power supply with the rotor same frequency in the intelligent static formula phase advancer for it simultaneously, be added in the motor rotor loop, thereby change the phase relation of motor rotor electric current and rotor voltage, reach the phase relation that changes motor stator currents and voltage by changes of magnetic field, the motor power (output) factor is improved, stator current descends, improve the service efficiency of motor, improve the operation conditions of motor, reach the purpose of using intelligent static formula phase advancer to carry out reactive power compensation on the spot.Handing over the alternating flow device in the intelligent static formula phase advancer is topmost high-power part in the equipment, because of moving continuously, the long-term big electric current of equipment easily produces high-temperature, make and hand in the alternating flow device main devices thyristor and controller fragile, easily produce circulation, circulation just is meant to hand in the alternating flow device and makes electric loop produce big electric current because of device failure causes the inner short circuit of electric loop, its operating current was doubled and redoubled when circulation produced, abnormal big electric current may burn out equipment in the electric loop, cause the rotor loop open circuit of motor, motor stops operating.
The friendship alternating flow device of intelligent static formula phase advancer partly is made up of devices such as 380V/6～11V main power transformer, 12 high-power thyristors, reactors, the former edge joint power plant of main power transformer 380V wherein, secondary 6～11V connect thyristor and reactor to motor three-phase rotor.It is open-minded that intelligent controller is sent relevant information control thyristor here according to the external signal input, makes the electric current of generation identical with the induced voltage frequency and the phase place of rotor, reaches the purpose of compensation power factor.Wire wound asynchronous motor operates in " metasynchronism " state generally speaking, different rotating speeds according to load changes to some extent, its induced voltage frequency changes between 1～4 hertz, and (variation that power is generally the big electric current of 10～35KW) secondary also changes in this frequency range (1～4 hertz) main power transformer.Its frequency is constant after circulation occurring, but electric current really is multiplied, and this electric current be not direct current neither standard interchange, it is that a kind of frequency is very low, electric current is very big, the non-interchange value that voltage is less, the method of measurement of this value generally is to adopt Hall element, but exist a lot of not enough when adopting Hall element to measure this non-interchange value in actual applications, all the more so when having circulation to produce especially, mainly be that Hall element is very big owing to being installed in electric current, on the very high busbar of temperature, very easily damage, next is the electric current (near the rated value of Hall element) that equipment just has kilo-ampere on the hundreds of when normally moving, when circulation occurring, electric current can be bigger, easily causes overrange, makes measured value inaccurate and cause control error.Main power device hands over the alternating flow device to adopt the Hall element mode to detect circulation in the tradition phase advancer, just detect the non-standard interchange value of main power transformer secondary, there is complex structure in this detection method, accuracy rate is low and cause when measuring shortcomings such as reliability is lower because of the working temperature height.
Summary of the invention
The purpose of this utility model is exactly to hand over the alternating flow device to adopt the Hall element mode to detect the existing weak point of circulation at above-mentioned phase advancer main power device, provides a kind of and adopts the AC current transformer detection to hand over the circulation of alternating flow device and the device of may command phase advancer circulation.
Technical solution of the present utility model is: a kind of intelligent static formula phase advancer detects and control device with circulation; comprise and hand over the alternating flow device; AC current transformer; intelligent controller; hand over the alternating flow device by main power transformer (B1); high-power thyristor; reactor; protection electric capacity; protection is with resistance and parts such as the three-phase bus bar composition that outputs to motor rotor; AC current transformer is installed on the former limit of main power transformer; be connected with intelligent controller by transfer wire; intelligent controller is connected with the 380V main power source; and be provided with the interface of external signal input; the interface of intelligent control signal output ends and connection hand over the thyristor of alternating flow device to trigger the interface of using signal output part; its principal character is: assembling AC current transformer and intelligent controller on the former limit of main power transformer in handing over the alternating flow device, detect and control the circulation of handing over the alternating flow device.
Friendship alternating flow device described in the utility model technical solution, when the electric current of the main power transformer secondary of its main power transformer (B1) changes, the end electric current on the former limit of main power transformer also changes, its principle is: the relational expression of former limit of main power transformer and main power transformer secondary is N1 * I1=N2 * I2, and in the formula: N1, I1 are the number of turn and the electric current on the former limit of main power transformer; N2, I2 are the number of turn and the electric current of main power transformer secondary.Because the former limit of main power transformer in the main power transformer (B1) and the coil turn of main power transformer secondary are fixed number, relational expression according to former limit of main power transformer and main power transformer secondary, electric current when the main power transformer secondary produces circulation changes interchangeable electric current of calculating the former limit of main power transformer and changes, and has the linear changing relation, so when devices such as high-power thyristor hinder generation circulation for some reason, hand over the main power transformer secondary of alternating flow device can produce very big non-standard alternating current, the former limit of main power transformer also produces bigger interchange normalized current, this current value can detect with AC current transformer, and measured value can be delivered to intelligent controller, by intelligent controller circulation is controlled.
AC current transformer described in the utility model technical solution, because this device is installed on the former limit of main power transformer, when handing over the alternating flow device to produce circulation, the big electric current on the former limit of main power transformer changes, can export by the ac current signal that 0-5A was measured and be transformed into to AC current transformer, this ac current signal be delivered to intelligent controller by transfer wire handle and control.
Intelligent controller described in the utility model technical solution, this device is made up of the interface of single-chip microcomputer and related peripheral hardware circuit, mainly is the course of work of handling relevant peripheral signal and controlling intelligent static formula phase advancer.This device can be according to the starting to control a little of the different set circulation value of intelligent static formula phase advancer watt level, and compare with signal that AC current transformer transmits and to handle the purpose that realizes circulation control.
The beneficial effects of the utility model are: hand over the circulation condition on the former limit of main power transformer in the alternating flow device because device system adopts AC current transformer to detect, and control according to testing result, apparatus structure is simple, detect that control is sensitive, high, the security of operation, cheap of reliability, overcome to adopt the Hall element mode to detect that the existing complex structure of circulation, accuracy rate are low, the weak point of poor reliability.
Description of drawings
Below, in conjunction with the accompanying drawings the utility model is further specified.
Fig. 1 is the utility model structural representation.
Among the figure: 1, intelligent controller, 2, transfer wire, 3, AC current transformer; 4,380V main power source, 5, hand over the alternating flow device, 6, the former limit of main power transformer; 7, main power transformer secondary, 8, high-power thyristor, 9, reactor; 10, protection electric capacity; 11, resistance is used in protection, and 12, output to the three-phase bus bar of motor rotor, 13, the external signal input; 14, intelligent controller signal output part, 15, thyristor triggers and to use signal output part.
Embodiment
As shown in Figure 1, form friendship alternating flow device (5) with electric capacity (10), protection with resistance (11) and the three-phase bus bar (12) that outputs to motor rotor by main power transformer (B1), high-power thyristor (8), reactor (9), protection.Intelligent controller (1), transfer wire (2), AC current transformer (3), 380V main power source (4), external signal input (13), intelligent controller signal output part (14), thyristor trigger with signal output part (15) forms the intelligent controller control system.When high-power thyristor (8) breaks down, promptly hand over alternating flow device (5) to break down and when producing circulation, the main power transformer secondary (7) that connects high-power thyristor (8) can produce very big electric current, the former limit of main power transformer (6) also very big electric current can occur, electric current on the former limit of main power transformer (6) changes and can be detected by AC current transformer (3) by 380V main power source (4), detected current changing signal is sent to intelligent controller (1) through transfer wire (2), and after comparing processing with signal by external signal input (13) input, by output of the intelligent controller signal output part (14) in the intelligent controller (1) and execution control, can avoid the friendship alternating flow device (5) in the device to pass through, owing to excess temperature causes the equipment burnout accident because of long-term big electric current.
Claims (1)
1. an intelligent static formula phase advancer detects and control device with circulation; comprise and hand over alternating flow device (5); AC current transformer (3); intelligent controller (1); hand over alternating flow device (5) by main power transformer (B1); high-power thyristor (8); reactor (9); protection electric capacity (10); protection is with resistance (11) and three-phase bus bar (12) composition that outputs to motor rotor; AC current transformer (3) is installed on the former limit of main power transformer (6); be connected with intelligent controller (1) by transfer wire (2); intelligent controller (1) is connected with 380V main power source (4); and be provided with the interface of external signal input (13); the interface of intelligent control signal output ends (14) and connection hand over the thyristor of alternating flow device (5) to trigger the interface of using signal output part (15); its principal character is: assembling AC current transformer (3) and intelligent controller (1) are gone up in the former limit of main power transformer (6) in handing over alternating flow device (5), detect and control the circulation of handing over alternating flow device (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201002529U CN201733274U (en) | 2010-01-25 | 2010-01-25 | Loop current detection and control device for intelligent static phase advancer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201002529U CN201733274U (en) | 2010-01-25 | 2010-01-25 | Loop current detection and control device for intelligent static phase advancer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201733274U true CN201733274U (en) | 2011-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201002529U Expired - Fee Related CN201733274U (en) | 2010-01-25 | 2010-01-25 | Loop current detection and control device for intelligent static phase advancer |
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| CN (1) | CN201733274U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810865A (en) * | 2011-05-31 | 2012-12-05 | 万洲电气股份有限公司 | Stepless and automatic voltage regulating and low-frequency low-current signal detecting circuit of variable-load phase advancer |
| CN107202947A (en) * | 2017-05-26 | 2017-09-26 | 国网四川省电力公司电力科学研究院 | A kind of efficient thyristor valves component test system and method for testing |
-
2010
- 2010-01-25 CN CN2010201002529U patent/CN201733274U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810865A (en) * | 2011-05-31 | 2012-12-05 | 万洲电气股份有限公司 | Stepless and automatic voltage regulating and low-frequency low-current signal detecting circuit of variable-load phase advancer |
| CN107202947A (en) * | 2017-05-26 | 2017-09-26 | 国网四川省电力公司电力科学研究院 | A kind of efficient thyristor valves component test system and method for testing |
| CN107202947B (en) * | 2017-05-26 | 2019-11-12 | 国网四川省电力公司电力科学研究院 | A kind of efficient thyristor valves component test system and test method |
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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: 20110202 Termination date: 20140125 |