CN102290781A - Heating furnace default phase protective control system - Google Patents
Heating furnace default phase protective control system Download PDFInfo
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- CN102290781A CN102290781A CN2011102237380A CN201110223738A CN102290781A CN 102290781 A CN102290781 A CN 102290781A CN 2011102237380 A CN2011102237380 A CN 2011102237380A CN 201110223738 A CN201110223738 A CN 201110223738A CN 102290781 A CN102290781 A CN 102290781A
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Abstract
The invention provides a heating furnace default phase protective control system which ensures a heating furnace of an induction log tool to operate reliably and safely. The system comprises a default phase and neutral point drifting detection circuit, a collection and control unit, a protective control circuit and an alarm circuit, wherein the default phase and neutral point drifting detection circuit comprises a voltage stabilizing filtering part, an optocoupler isolation part and a comparison amplifying part which are connected in sequence; the signal output end of the comparison amplifying part is connected with the detection signal input end of the collection and control unit; and a control signal is output by the collection and control unit to the protective control circuit, so as to realize the switch control of a power supply. The heating furnace default phase protective control system provided by the invention is suitable for a three-phase four-wire system, can be used for carrying out immediate action on the occurred default phase and disconnecting the corresponding power supply, but also can be used for reflecting the neutral point drifting condition of each load circuit in real time, so that technical personnel can timely process and nip in the bud, thus the reliability and three-phase load safety of a heating and testing system are ensured.
Description
Technical field
The present invention relates to a kind of open-phase protection control system, relate in particular to the pot arch open-phase protection control system that is applied to induction log tool.
Background technology
Induction log tool is important formation resistivity logging instrument, is bringing into play important effect in the petroleum industry exploration and development.In the oil exploration well logging, general down-hole maximum temperature can reach 175 ℃, and induction logging instrument is because instrument size is long, higher to environmental requirement when high-temperature test and scale---and instrument is 5m radially, axially in the 2m scope of two ends ferromagnetic material can not be arranged.Therefore, the pot arch of induction log tool is the nucleus equipment in whole instrument research and development, the production link, and the reliability of the pilot system of heating and threephase load safety are guaranteed.
Summary of the invention
The object of the present invention is to provide a kind of pot arch open-phase protection control system, make reliable, the trouble free service of induction log tool pot arch.
Technical solution of the present invention is:
Pot arch open-phase protection control system comprises phase shortage and neutral point drifting testing circuit, collection and control unit, protection control circuit and warning circuit; Described phase shortage and neutral point drifting testing circuit comprise voltage regulation filtering part, the light-coupled isolation part that connects successively and compare amplifier section, relatively the signal output part of amplifier section is connected to the detection signal input of collection and control unit, and collection and control unit output control signals to the protection control circuit to realize the switch control of power supply;
If pot arch load to be detected has M, total M+3 is individual for then described phase shortage and neutral point drifting testing circuit, corresponds respectively to L1, L2, L3 three-phase voltage and M load power source of pot arch general supply; For load power source, the A of load, B, C three phase mains converge node and neutral line terminal inserts described voltage regulation filtering part; For the pot arch general supply, the terminal of L1, L2, L3 phase inserts the different phase shortages and the voltage regulation filtering part of neutral point drifting testing circuit with the terminal of the neutral line respectively.
Above-mentioned voltage regulation filtering partly adopts two voltage stabilizing didoes and a rectifier diode to constitute the two-stage voltage stabilizing circuit.
Above-mentioned protection control circuit comprises photoelectricity coupling unit and bidirectional triode thyristor; light-emitting diode one side joint of described photoelectricity coupling unit is gone into described microprocessor output control signal, and the triode side of photoelectricity coupling unit exports ac contactor coil in order to Switching Power Supply to through bidirectional triode thyristor.
The present invention has the following advantages:
1, not only can move immediately, cut off corresponding power supply, can also reflect the neutral point drifting situation of each load circuit in real time, be convenient to the technical staff and in time handle, prevent trouble before it happens the phase shortage that occurs.
2, the present invention is applicable to three-phase four-wire system, and the reliability of the pilot system of heating and threephase load safety are guaranteed.
Description of drawings
Fig. 1 is a systematic schematic diagram of the present invention;
Fig. 2 is that blower fan neutral point drifting of the present invention and phase shortage detect schematic diagram and circuit structure diagram, and hoist engine, heating load testing circuit are identical therewith;
Fig. 3 is that the L1 phase phase shortage of pot arch general supply of the present invention detects schematic diagram and circuit structure diagram, and L2, L3 phase detecting circuit are identical therewith;
Fig. 4 is control system schematic diagram of the present invention and circuit structure diagram, wherein, (a) is the control system schematic diagram, (b) is circuit structure diagram; In circuit structure diagram, by components and parts such as U1B, SCR1 form for the hoist engine power control circuit, the control circuit of blower fan and heating load is identical therewith; Be followed successively by crystal oscillating circuit (clock oscillation circuit), reset circuit, collection and control unit, serial communication interface, protection control circuit, open-phase fault warning circuit among the figure.
Embodiment
Applying electronic circuit of the present invention realizes the phase shortage of each three-phase circuit of induction pot arch and neutral point drifting detects and protection automatically.System of the present invention mainly is made up of phase shortage and neutral point drifting testing circuit, collection and control unit, protection control circuit and warning circuit.Testing circuit L1, L2, the L3 three-phase totally 6 road testing circuits that are primarily aimed at blower fan, hoist engine, heating load and general supply wherein.
With reference to the accompanying drawings the present invention is described in detail:
Neutral point drifting of each load (is example with the blower fan) and lack detection circuit schematic diagram as shown in Figure 2, when the three phase mains balance of load, C1, C2, the node potential of three electric capacity of C3 is very low, and the output of optocoupler approaches zero level, and comparator U2A exports high level at this moment; When phase shortage or three-phase imbalance to a certain degree the time, C1, C2, the node of three electric capacity of C3 is the fluctuating signal of 12V amplitude, also export the input of 6.2V direct voltage after the voltage stabilizing once more through capacitor filtering to optocoupler, this moment, the output of optocoupler outlet side saturation conduction approached the supply voltage of VCC, U2A output low level.Rw1 is used for regulating the action threshold value of open-phase protection, and this testing circuit is applicable to three-phase four-wire system, adopts the light-coupled isolation forceful electric power, and is safe and reliable.
Port A, B, C are the inlet power supply node of threephase load, and port N is the neutral line, and VCC is+the 5V power supply that amplifier output signal FJ_Sa (blower fan sampled signal) is to the MCU signal acquisition module; Protection also is identical circuit to hoist engine with heating load, and output signal JYJ_Sa and JR_Sa are to the MCU signal acquisition module; L1, L2, L3 are total three phase mains Ingress node.Operational amplifier is selected TL072P; Optocoupler is selected TLP521; Capacitor C 1, C2, C3 are 1uF/63OV CBB electric capacity; Voltage stabilizing didoe D2, D3 is respectively 2CW110,2CW54.
Fig. 3 is a pot arch general supply L1 phase lack detection circuit, and its principle and Fig. 2 are described basic identical, is to be used for determining that general supply specifically is which phase shortage or under-voltage.
The core of control system structure shown in Figure 4 is microcontroller PIC18F14K50.Oscillating circuit adopts the 10MHz crystal oscillator, and inside is set to 4 frequencys multiplication, so system clock is 40MHz, can guarantee to respond fast fault-signal and cuts off the electricity supply by control circuit.The detection signal of Fig. 2 and Fig. 3 output exports the built-in ADC pin (A/D conversion) of microcontroller to, after microcontroller collects fault-signal, according to program setting, at first the control circuit of forming by components and parts such as optocoupler, bidirectional triode thyristors cuts off the ac contactor coil power supply, the square wave of the 4.1KHz of the output of 11 pins by U8 then makes buzzer send chimes of doom, and transmits related data through serial ports simultaneously and show to host computer.
The MCU microcontroller chip is PIC18F14K50, built-in chip type 10 analog to digital converters of 9 paths, by this built-in ADC default phase signal is sampled; Auxiliary circuit comprises clock oscillation circuit and reset circuit.Clock oscillation circuit is made up of crystal oscillator and electric capacity; Wherein crystal oscillator employing frequency is the passive crystal oscillator of 10MHz; Electric capacity adopts the 33pF leaded multilayer ceramic capacitor.Reset circuit offers the microcontroller chip reseting pulse signal, when MCU does not work or powers on it is resetted.
Buzzer alarm circuit is controlled by MCU, sounds the alarm by warning circuit when phase shortage or three-phase imbalance, and disconnects the ac contactor coil power supply simultaneously.
With reference to accompanying drawing, the annexation of device in each circuit is described below.
The explanation of Fig. 2 annexation: A, B, C are the three-phase power input end mouth, and N is a neutral line port.Coupling capacitance C1, C2, C3 one end connect A, B, C respectively, and the other end connects the negative electrode of voltage stabilizing didoe D2 and the anode of rectifier diode D1 jointly; The negative electrode of D1 is connected to the positive pole of filter capacitor C5; Resistance R 1 one ends are connected to the positive pole of C5, and the other end is connected to the negative electrode of voltage stabilizing didoe D3; One end of resistance R 2 connects the negative electrode of D3, and the other end is connected to the anode of optocoupler U1A light-emitting diode; N is connected to the negative electrode of D2, D3, the negative pole of C5 and the negative electrode of optocoupler diode, as their reference ground; Optocoupler U1A triode side collector electrode is connected to+5V power supply VCC; Emitter-base bandgap grading is connected to the inverting input of operational amplifier U2A, and is connected to an end of resistance R 4 and capacitor C 6 simultaneously; The normal phase input end of U2A is connected to the end of R3, and the other end of R3 is connected to VCC; The end of adjustable resistance Rw1 is connected to the normal phase input end of its moving contact pin to U2A, and an other end is connected to the end of R4, C6 and receives simultaneously with reference to earth signal GND; 8 pin of U2A and 4 pin are respectively the positive-negative power pin of amplifier, receive VCC and GND respectively; U2A output 1 pin is connected to 13 pin (Fig. 4) of U8.
The explanation of Fig. 3 annexation: L1 is the three phase mains first phase input port, and N is a neutral line port.Coupling capacitance C20 one end connects L1, and the other end connects the negative electrode of voltage stabilizing didoe D22 and the anode of rectifier diode D21; The negative electrode of D21 is connected to the positive pole of filter capacitor C22; Resistance R 21 1 ends are connected to the positive pole of C22, and the other end is connected to the negative electrode of voltage stabilizing didoe D23; One end of resistance R 35 connects the negative electrode of D23, and the other end is connected to the anode of optocoupler U10A light-emitting diode; N is connected to the negative electrode of D22, D23, the negative pole of C22 and the negative electrode of optocoupler diode, as their reference ground; Optocoupler U10A triode side collector electrode is connected to+5V power supply VCC; Emitter-base bandgap grading is connected to the inverting input of operational amplifier U9A, and is connected to an end of resistance R 36 and capacitor C 23 simultaneously; The normal phase input end of U9A is connected to the end of R40, and the other end of R40 is connected to VCC; The end of adjustable resistance Rw8 is connected to the normal phase input end of its moving contact pin to U9A, and an other end is connected to the end of R36, C23 and receives simultaneously with reference to earth signal GND; 8 pin of U9A and 4 pin are respectively the positive-negative power pin of amplifier, receive VCC and GND respectively; U9A output 1 pin is connected to 16 pin (Fig. 4) of U8.
The explanation of Fig. 4 annexation: capacitor C 7, C8 and crystal oscillator X1 form oscillating circuit, and for microcontroller U8 provides the clock source, wherein the end of C7 and C8 is connected to ground GND, and an other end is connected respectively to the two ends of X1 and is connected to 2 pin and the tripod of U8 simultaneously; Diode D4, resistance R 5 and capacitor C 9 are formed reset circuit, and the end of R5 connects the anode of D4 and the end of C9, is connected to 4 pin of U8 simultaneously, and the other end of R5 and the negative electrode of D4 are connected to+5V power supply VCC jointly, and the other end of C9 is connected to ground GND; J1 is a serial communication interface, and 3 pin of J1 are connected to 12 pin of U8, and 2 pin of J1 are connected to 10 pin of U8, and 5 pin of J1 are connected to ground GND; U1B, the protection control circuit of the hoist engine that SCR1 and Resistor-Capacitor Unit are formed, the end of R7 is connected to 5 pin of U8, the other end is connected to the anode of optocoupler U1B light-emitting diode, the negative electrode of U1B light-emitting diode connects ground GND, R6 one end is connected to+the 5V power supply, the other end is connected to the collector electrode of U1B triode side and the gate pole of bidirectional triode thyristor SCR1, U1B triode side emitter-base bandgap grading is connected to neutral line N, after being connected to resistance R 8, the end of SCR1 outputs to ac contactor coil, the other end of SCR1 is connected to neutral line N, and the end of C10 is connected to the other end of R8 and is connected to neutral line N; Form the open-phase fault warning circuit by components and parts such as buzzer LS1 and triode Q1, wherein resistance R 9 one ends connect 11 pin of microcontroller U8, an other end connects the base stage of triode Q1, resistance R 10 1 ends connect the base stage of Q1, an other end is connected to ground GND, the emitter-base bandgap grading of triode Q1 is connected to ground GND, and collector electrode is connected to the end of buzzer LS1, and the other end of buzzer LS1 is connected to+5V power supply VCC.
Claims (3)
1. pot arch open-phase protection control system is characterized in that: comprise phase shortage and neutral point drifting testing circuit, collection and control unit, protection control circuit and warning circuit; Described phase shortage and neutral point drifting testing circuit comprise voltage regulation filtering part, the light-coupled isolation part that connects successively and compare amplifier section, relatively the signal output part of amplifier section is connected to the detection signal input of collection and control unit, and collection and control unit output control signals to the protection control circuit to realize the switch control of power supply;
If pot arch load to be detected has M, total M+3 is individual for then described phase shortage and neutral point drifting testing circuit, corresponds respectively to L1, L2, L3 three-phase voltage and M load power source of pot arch general supply; For load power source, the A of load, B, C three phase mains converge node and neutral line terminal inserts described voltage regulation filtering part; For the pot arch general supply, the terminal of L1, L2, L3 phase inserts the different phase shortages and the voltage regulation filtering part of neutral point drifting testing circuit with the terminal of the neutral line respectively.
2. pot arch open-phase protection control system according to claim 1 is characterized in that: described voltage regulation filtering partly adopts two voltage stabilizing didoes and a rectifier diode to constitute the two-stage voltage stabilizing circuit.
3. pot arch open-phase protection control system according to claim 1; it is characterized in that: described protection control circuit comprises photoelectricity coupling unit and bidirectional triode thyristor; light-emitting diode one side joint of described photoelectricity coupling unit is gone into described microprocessor output control signal, and the triode side of photoelectricity coupling unit exports ac contactor coil in order to Switching Power Supply to through bidirectional triode thyristor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102237380A CN102290781A (en) | 2011-08-05 | 2011-08-05 | Heating furnace default phase protective control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102237380A CN102290781A (en) | 2011-08-05 | 2011-08-05 | Heating furnace default phase protective control system |
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| CN102290781A true CN102290781A (en) | 2011-12-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411824A (en) * | 2011-12-23 | 2012-04-11 | 浙江师范大学 | Intelligent terminal alarm circuit |
| CN106771677A (en) * | 2017-01-25 | 2017-05-31 | 苏州振湖电炉有限公司 | The open-phase protection circuit of induction furnace power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2217275Y (en) * | 1994-11-28 | 1996-01-10 | 汪复胜 | Super miniature protection switch against phase interruption |
| CN2261681Y (en) * | 1996-08-19 | 1997-09-03 | 马承柱 | Phase-off protector for A.C. motor with optically coupling air separate switch |
| CN1275832A (en) * | 1999-05-27 | 2000-12-06 | 沈贵贤 | Controller for constant speed ac induction motor |
| CN202197083U (en) * | 2011-08-05 | 2012-04-18 | 西安思坦仪器股份有限公司 | Warming furnace open-phase protection control system |
-
2011
- 2011-08-05 CN CN2011102237380A patent/CN102290781A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2217275Y (en) * | 1994-11-28 | 1996-01-10 | 汪复胜 | Super miniature protection switch against phase interruption |
| CN2261681Y (en) * | 1996-08-19 | 1997-09-03 | 马承柱 | Phase-off protector for A.C. motor with optically coupling air separate switch |
| CN1275832A (en) * | 1999-05-27 | 2000-12-06 | 沈贵贤 | Controller for constant speed ac induction motor |
| CN202197083U (en) * | 2011-08-05 | 2012-04-18 | 西安思坦仪器股份有限公司 | Warming furnace open-phase protection control system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411824A (en) * | 2011-12-23 | 2012-04-11 | 浙江师范大学 | Intelligent terminal alarm circuit |
| CN106771677A (en) * | 2017-01-25 | 2017-05-31 | 苏州振湖电炉有限公司 | The open-phase protection circuit of induction furnace power supply |
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Application publication date: 20111221 |