CN103176027B - Connection detection method and device for secondary circuit of current detection unit - Google Patents
Connection detection method and device for secondary circuit of current detection unit Download PDFInfo
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- CN103176027B CN103176027B CN201110443019.XA CN201110443019A CN103176027B CN 103176027 B CN103176027 B CN 103176027B CN 201110443019 A CN201110443019 A CN 201110443019A CN 103176027 B CN103176027 B CN 103176027B
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Abstract
The invention discloses a connection detection method for a secondary circuit of a current detection unit. The method includes: setting three-phase current transformers in the current detection unit, mutually connecting second ends of the current transformers to form a common end, and allowing first ends of the current transformers to be mutually independent; setting first verification terminals in the current detection unit by mutual connection; allowing the common terminal, the first ends of the three-phase current transformers and the first verification terminals to form a male terminal; setting receiving terminals of the three-phase current transformers and a receiving terminal of the common end in a protection module; setting second verification terminals in the protection module by means of mutual disconnection; and allowing the receiving terminal of the common end, the receiving terminals of the three-phase current transformers and the second verification terminals to form a female terminal. The female terminal matches with the male terminal. The receiving terminal of the common end matches with the common end. The receiving terminals of the three-phase current transformers match with the first ends of the three-phase transformers. The first verification terminals match with the second verification terminals.
Description
Technical field
The present invention relates to low voltage electrical apparatus technology field, more particularly, the current sensing means secondary circuit relating to a kind of device for switching connects detection method and device.
Background technology
Control and protective switching device is a kind of staple product of Low Voltage Electrical Apparatus, and this product is integrated with the control and scheduling co-design function of device for switching, has the advantage that volume is little, function is strong.Common control and protective switching device has the version of modularization, plug type or integral type.For modularization, plug type control and protective switching device, its plug form is generally presented as mutually patching of its power base and protection module.
The current sensing means of control and protective switching device generally uses is with cored current transformer; with cored current transformer, primary current is converted to secondary current signal; secondary current signal obtains the final signal of applicable protection circuit part or protection module through a series of signal process, realizes various control and scheduling co-design function whereby.
Authorization Notice No. CN1258798C; the Chinese patent application being entitled as " device with contactor and isolating switch function " discloses a kind of electrical equipment with the device of contactor and isolating switch function; comprise controlling magnet and protective device, they can respond manual control respectively by a multipole device separately and electric fault detects and acts on moving contact.Electromagnetic trip device is added on contact control gear.Preferably; interchangeable protective device is connected on relay magnet by operation circuit, by tripping operation connection on control gear, thus outputs on operation circuit by the power supply of electromagnet; and in the situation of breaking down, a trip signal is outputted on tripping operation circuit.Electromagnet is DC type, and protective device regulates its supply voltage.According to the technical scheme of CN1258798C, protective device comprises the device that the electric current of power conductor is flow through in detection.Because detect the electric current flowing through power conductor, power conductor must pass through pick-up unit.Like this; when above-mentioned detection device is positioned at protective device; it is set up inevitable nearer with the electronic devices and components in protection module apart at space cloth; and carry out heat insulation without housing; power conductor, by the inevitable electronic devices and components directly had influence on the electronic circuit board close with it of heat produced during pick-up unit, causes the performance and used life of electronic devices and components in protective device greatly to reduce.
Publication number is CN101924344, the Chinese patent being entitled as " a kind of multi-functional control and protection switch electrical equipment " discloses a kind of multi-functional control and protection switch electrical equipment, comprise containing main circuit, the power plant module controlling electromagnet, release electromagnet and operating mechanism, operating mechanism controls the electric power loop of electromagnet by Mechanical course contact break-make, operating mechanism reports contact module and release electromagnet machinery association with letter, and operating mechanism realizes the breaking and closing of main circuit by gear train; Containing the protection module of release electromagnet driving circuit, current sensor and signal processing control unit; And provide power supply to the power module controlling solenoid driver circuit, release electromagnet driving circuit and signal processing control unit respectively.Multi-functional control provided by the invention and protection switch electrical equipment, by adopting the structural design of unitary module, provide the device for switching of controlling functions, the short circuit breaking function of isolating switch and the overload protection function of overload relay having contactor concurrently.
According to the technical scheme of CN101924344, protection module comprises release electromagnet driving circuit and current sensor; The primary circuit of current sensor is connected with main circuit by wire clamp or plug, and the induced signal of the secondary circuit of current sensor is connected with signal processing control unit, thus the detection realized main circuit current and judgement.Because protection module comprises current sensor, current sensor heating in use, can affect usability and the life-span of adjacent components and parts; And because the primary circuit of current sensor is connected with main circuit by wire clamp or plug, its connected mode makes the resistance of junction and temperature rise increase, its reliability connected directly can have influence on the measuring accuracy of current sensor, and then has an impact to whole product.
Visible, the placement location of above-mentioned two kinds of current sensing meanss all also exists technical deficiency.Thus, current sensing means is placed in power base, makes the Ampereconductors of major loop directly pass through current sensing means.Like this; what draw is the induced signal of current sensor secondary circuit; and the introducing of the weak electric signal of induction can not cause the rising of protection module inside circumference temperature rise; and then performance and the life-span of relevant components and parts can not be affected; and greatly can reduce the contact engaging and separating force of plug-in module, be conducive to the raising of topology layout and mechanical property.
Like this, to be placed in power base the situation outside i.e. protection module for current sensing means, the reliability mutually patched of itself and protection module must be considered by emphasis.
For the current sensing means be placed in outside protection module, the reliability mutually patched between its secondary circuit and protection module is related to the functional reliability of control and protective switching device and the security of affiliated primary circuit thereof.A kind of situation that may occur is: whole control and protective switching device is in closure state; but current sensing means secondary circuit does not patch with protection module reliably; protection module cannot obtain the reflection of current transformer to primary current; once now primary circuit is short-circuited fault; protection module cannot detect short-circuit current; thus the signal that cannot send for disjunction primary circuit, cause destructive accident.
Therefore, need to detect the connection reliability of current sensing means secondary circuit.
Summary of the invention
The present invention is intended to propose a kind of technology detected the connection reliability of current sensing means secondary circuit.
According to one embodiment of the invention, propose a kind of current sensing means secondary circuit and connect the method detected, comprising:
At current sensing means internal placement threephase current transformer, in threephase current transformer, the second end of each mutual inductor is connected to each other formation common port, and in threephase current transformer, the first end of each current transformer is independent separately;
The first checking terminal is arranged in the mode be connected with each other in current sensing means inside;
The first end of common port, threephase current transformer and the first checking terminal form male terminal jointly;
In the receiving terminal of protection module internal placement threephase current transformer and the receiving terminal of common port;
The second checking terminal is arranged protection module is inner in disjunct mode each other;
The receiving terminal of common port, the receiving terminal of threephase current transformer and the second checking terminal form female terminal jointly, female terminal mates with male terminal, the receiving terminal coupling common port of common port, the first end of the receiving terminal coupling threephase current transformer of threephase current transformer, the first checking terminal coupling second checking terminal.
In one embodiment, the first checking terminal is two, is arranged in the both sides of the first end of common port and threephase current transformer; Second checking terminal is two, is arranged in the both sides of the receiving terminal of common port and the receiving terminal of threephase current transformer.
In one embodiment, the length being shorter in length than the first end of described common port and threephase current transformer of the first checking terminal; The length being shorter in length than the receiving terminal of described common port and the receiving terminal of threephase current transformer of the second checking terminal.
In one embodiment, detect the connection situation of the second checking terminal arranged in disjunct mode each other in protection module inside, to change the level state of the I/O port of microprocessor in protection module, the level state of this I/O port of microprocessor judges: when primary circuit disconnects, when this level is high, microprocessor sends the signal for closed primary circuit; When this level is low, microprocessor is forbidden sending the signal for closed primary circuit; When primary circuit is closed, when this level is high, microprocessor maintains current state; When this level is low, microprocessor sends the signal for disjunction primary circuit; By detecting the connection of current sensing means secondary circuit, change the on off operating mode of primary circuit, to ensure the safe operation of whole control and protective switching device.
In one embodiment, between each Secondary Winding coil of threephase current transformer, arrange resistance, the resistance of described resistance meets: normally patching the maintenance sample rate current under state; Improper patch state under maintain the connection of the secondary side circuit of threephase current transformer.
According to one embodiment of the invention, propose a kind of current sensing means secondary circuit and connect the device detected, comprising:
Threephase current transformer, is arranged on current sensing means inside, and in threephase current transformer, the second end of each mutual inductor is connected to each other formation common port, and in threephase current transformer, the first end of each current transformer is independent separately;
First checking terminal, is arranged on current sensing means inside, and the first checking terminal is connected with each other;
Male terminal, by the first end and first of common port, threephase current transformer, male terminal verifies that terminal is formed jointly;
Receiving terminal, is arranged on protection module inside, and receiving terminal comprises the receiving terminal of threephase current transformer and the receiving terminal of common port;
Second checking terminal, is arranged on protection module inside, and the second checking terminal is not connected each other;
Female terminal, female terminal is formed jointly by the receiving terminal of common port, the receiving terminal of threephase current transformer and the second checking terminal;
Wherein female terminal mates with male terminal, the receiving terminal coupling common port of common port, the first end of the receiving terminal coupling threephase current transformer of threephase current transformer, the first checking terminal coupling second checking terminal.
In one embodiment, the first checking terminal is two, is arranged on the both sides of the first end of common port and threephase current transformer; Second checking terminal is two, is arranged on the both sides of the receiving terminal of common port and the receiving terminal of threephase current transformer.
In one embodiment, the length being shorter in length than the first end of described common port and threephase current transformer of the first checking terminal; The length being shorter in length than the receiving terminal of described common port and the receiving terminal of threephase current transformer of the second checking terminal.
In one embodiment, to disjunct second verifying that terminal carries out conduction detection each other, to change the level state of the I/O port of microprocessor in protection module, the level state of this I/O port of microprocessor judges: when primary circuit disconnects, when this level is high, microprocessor sends the signal for closed primary circuit; When this level is low, microprocessor is forbidden sending the signal for closed primary circuit; When primary circuit is closed, when this level is high, microprocessor maintains current state; When this level is low, microprocessor sends the signal for disjunction primary circuit; By detecting the connection of current sensing means secondary circuit, change the on off operating mode of primary circuit, to ensure the safe operation of whole control and protective switching device.
In one embodiment, also comprise resistance between each Secondary Winding coil of threephase current transformer, the resistance of described resistance meets: normally patching the maintenance sample rate current under state; Improper patch state under maintain the connection of the secondary side circuit of threephase current transformer.
The present invention proposes a kind of current sensing means secondary circuit and connect the method and apparatus detected; by the method and application of installation in device for switching particularly control and protective switching device, can avoid because current sensing means and protection module patch the potential hazard of the reliability of the device for switching of unreliable generation and the security of affiliated primary circuit thereof.It is few that current sensing means secondary circuit of the present invention connects the component number required by method and apparatus detected, and structure is simple, and reliability is high, uses and have the advantages that volume is little, cost is low in control and protective switching device.
Accompanying drawing explanation
The above and other feature of the present invention, character and advantage are by more obvious by what become below in conjunction with the description of drawings and Examples, and Reference numeral identical in the accompanying drawings represents identical feature all the time, wherein:
Fig. 1 discloses the schematic diagram of the threephase current transformer Secondary Winding coil used according to one embodiment of present invention.
Fig. 2 discloses the schematic diagram of current sensing means and protection module connection detection circuit according to one embodiment of present invention.
Fig. 3 discloses the process flow diagram of trace routine performed according to one embodiment of present invention.
Fig. 4 discloses the schematic diagram of the protection circuit used according to one embodiment of present invention.
Fig. 5 discloses the schematic diagram of the current transducer signal treatment circuit used according to one embodiment of present invention.
Embodiment
First the present invention discloses a kind of current sensing means secondary circuit and connects the method detected, and comprises following step:
At current sensing means internal placement threephase current transformer, in threephase current transformer, the second end of each mutual inductor is connected to each other formation common port, and in threephase current transformer, the first end of each current transformer is independent separately.
The first checking terminal is arranged in the mode be connected with each other in current sensing means inside.First checking terminal is generally two, is arranged in the both sides of the first end of common port and threephase current transformer.
The first end of common port, threephase current transformer and the first checking terminal form male terminal jointly.
In the receiving terminal of protection module internal placement threephase current transformer and the receiving terminal of common port.
The second checking terminal is arranged protection module is inner in disjunct mode each other.Second checking terminal is generally two, is arranged in the both sides of the receiving terminal of common port and the receiving terminal of threephase current transformer.
The receiving terminal of common port, the receiving terminal of threephase current transformer and the second checking terminal form female terminal jointly, female terminal mates with male terminal, the receiving terminal coupling common port of common port, the first end of the receiving terminal coupling threephase current transformer of threephase current transformer, the first checking terminal coupling second checking terminal.
Under normal conditions, male terminal is made up of 6 terminals, and same female terminal is also made up of 6 terminals.These 6 pairs of terminals should depending on as a whole and exist in definition; but it should be noted that; the solution of the present invention is not limited to 6 pairs of terminals, if accurately can reflect current sensing means and protection module patch situation, all should be regarded as within the scope of the invention.
The length of the first checking terminal can be shorter than the length of the first end of common port and threephase current transformer.Accordingly, the length of the second checking terminal can be shorter than the length of the receiving terminal of common port and the receiving terminal of threephase current transformer.Like this, when the checking terminal being positioned at both sides patches good, can ensure that middle 4 pairs of terminals patch well (middle 4 pairs of terminals are longer), can ensure that the connection of current sensing means secondary circuit is good simultaneously.
Detection carries out on the second checking terminal, detect the connection situation of the second checking terminal arranged in disjunct mode each other in protection module inside, to change the level state of the I/O port of microprocessor in protection module, the level state of this I/O port of microprocessor judges: when primary circuit disconnects, when this level is high, microprocessor sends the signal for closed primary circuit; When this level is low, microprocessor is forbidden sending the signal for closed primary circuit.When primary circuit is closed, when this level is high, microprocessor maintains current state; When this level is low, microprocessor sends the signal for disjunction primary circuit.By detecting the connection of current sensing means secondary circuit, change the on off operating mode of primary circuit, to ensure the safe operation of whole control and protective switching device.
In one embodiment, between each Secondary Winding coil of threephase current transformer, arrange resistance, the resistance of resistance meets: normally patching the maintenance sample rate current under state; Improper patch state under maintain the connection of the secondary side circuit of threephase current transformer.After resistance is set; select suitable resistance; resistance both can not be had an impact to the current sample that current sensing means and protection module normally patch under state; again can improper patch state under guarantee the connection of the secondary side circuit of current transformer; thus avoid Secondary Winding coil induces very high voltage, security threat is caused to current sensing means and the person.
Present invention further teaches a kind of current sensing means secondary circuit and connect the device detected, comprising:
Threephase current transformer, is arranged on current sensing means inside, and in threephase current transformer, the second end of each mutual inductor is connected to each other formation common port, and in threephase current transformer, the first end of each current transformer is independent separately.
First checking terminal, is arranged on current sensing means inside, and the first checking terminal is connected with each other.First checking terminal is generally two, is arranged in the both sides of the first end of common port and threephase current transformer.
Male terminal, by the first end and first of common port, threephase current transformer, male terminal verifies that terminal is formed jointly.
Receiving terminal, is arranged on protection module inside, and receiving terminal comprises the receiving terminal of threephase current transformer and the receiving terminal of common port.
Second checking terminal, is arranged on protection module inside, and the second checking terminal is not connected each other.Second checking terminal is generally two, is arranged in the both sides of the receiving terminal of common port and the receiving terminal of threephase current transformer.
Female terminal, female terminal is formed jointly by the receiving terminal of described common port, the receiving terminal of threephase current transformer and the second checking terminal.Female terminal mates with male terminal, the receiving terminal coupling common port of common port, the first end of the receiving terminal coupling threephase current transformer of threephase current transformer, the first checking terminal coupling second checking terminal.
Under normal conditions, male terminal is made up of 6 terminals, and same female terminal is also made up of 6 terminals.These 6 pairs of terminals should depending on as a whole and exist in definition; but it should be noted that; the solution of the present invention is not limited to 6 pairs of terminals, if accurately can reflect current sensing means and protection module patch situation, all should be regarded as within the scope of the invention.
The length of the first checking terminal can be shorter than the length of the first end of common port and threephase current transformer.Accordingly, the length of the second checking terminal can be shorter than the length of the receiving terminal of common port and the receiving terminal of threephase current transformer.Like this, when the checking terminal being positioned at both sides patches good, can ensure that middle 4 pairs of terminals patch well (middle 4 pairs of terminals are longer), can ensure that the connection of current sensing means secondary circuit is good simultaneously.
Detection carries out on the second checking terminal, detect the connection situation of the second checking terminal arranged in disjunct mode each other in protection module inside, to change the level state of the I/O port of microprocessor in protection module, the level state of this I/O port of microprocessor judges: when primary circuit disconnects, when this level is high, microprocessor sends the signal for closed primary circuit; When this level is low, microprocessor is forbidden sending the signal for closed primary circuit.When primary circuit is closed, when this level is high, microprocessor maintains current state; When this level is low, microprocessor sends the signal for disjunction primary circuit.By detecting the connection of current sensing means secondary circuit, change the on off operating mode of primary circuit, to ensure the safe operation of whole control and protective switching device.
In one embodiment, between each Secondary Winding coil of threephase current transformer, arrange resistance, the resistance of resistance meets: normally patching the maintenance sample rate current under state; Improper patch state under maintain the connection of the secondary side circuit of threephase current transformer.After resistance is set; select suitable resistance; resistance both can not be had an impact to the current sample that current sensing means and protection module normally patch under state; again can improper patch state under guarantee the connection of the secondary side circuit of current transformer; thus avoid Secondary Winding coil induces very high voltage, security threat is caused to current sensing means and the person.
Specific implementation of the present invention is introduced below in conjunction with accompanying drawing.It should be noted that, the object of these specific implementations understands the present invention to more contribute to, and good effect of the present invention is embodied more, but these specific implementations should not be considered as the restriction to the present invention program.
Current sensing means secondary circuit of the present invention connects the device detected and comprises current sensing means and protection module connection detection circuit, and current sensing means secondary circuit of the present invention connects the method detected and is applied on this device.
Fig. 1 discloses the schematic diagram of the threephase current transformer Secondary Winding coil used according to one embodiment of present invention.Threephase current transformer is arranged in current sensing means, current sensing means is arranged in power base, wherein, CT1, CT2, CT3 are respectively three Secondary Winding of threephase current transformer, Signal_L1, Signal_L2, Signal_L3 and Signal_Common are four terminals of the Secondary Winding of threephase current transformer, and Signal_Common is common port wherein.
Fig. 2 discloses the schematic diagram of current sensing means and protection module connection detection circuit according to one embodiment of present invention.This testing circuit comprises: microcontroller M, crystal oscillator Y, splicing ear Pmale (male terminal), splicing ear Pfemale (female terminal), resistance R1, R2, N-channel MOS pipe Q, electric capacity C.
No. 2 pin of resistance R1 are connected with power Vcc, and No. 1 pin is connected with No. 1 pin of splicing ear Pmale.No. 2 pin of Pmale are connected with No. 2 pin of Pfemale, No. 3 pin of Pmale are connected with No. 3 pin of Pfemale, No. 4 pin of Pmale are connected with No. 4 pin of Pfemale, No. 5 pin of Pmale are connected with No. 5 pin of Pfemale, No. 6 pin of Pmale and No. 2 pin of resistance R2, No. 2 pin of N-channel MOS pipe Q connect, No. 1 pin of resistance R2 is connected with No. 3 pin of N-channel MOS pipe Q and ground connection, No. 1 pin of N-channel MOS pipe Q and No. 1 pin of electric capacity C, No. 2 pin of controller M connect, No. 2 pin of electric capacity C are connected with No. 1 pin of controller M and connect power Vcc, No. 1 pin of crystal oscillator Y is connected with No. 6 pin of controller M, No. 2 pin of crystal oscillator Y are connected No. 1 pin of Pfemale with No. 7 pin of controller M, No. 1 pin of Pfemale is connected with No. 6 pin of Pfemale.Splicing ear Pfemale is positioned at power base; all the other components and parts are all positioned at protection module; it should be noted that, the placement location of element can change, and also splicing ear Pfemale can be placed in protection module and be placed in power base by all the other elements.Microcontroller M outputs signal power supply by Switching Power Supply, and Vcc and GND is the signal that Switching Power Supply exports.When No. 1 pin of splicing ear Pfemale and splicing ear Pmale and No. 6 pin reliably patch, No. 1 pin of Pmale is communicated with No. 6 pin, voltage vcc is after resistance R1, R2 dividing potential drop, high level is produced at No. 2 pin of resistance R2, N-channel MOS pipe Q conducting, its conduction voltage drop, at below 0.02V, can be ignored compared with Vcc.Like this, signal SGND and GND is communicated with, and namely the GND of microcontroller M is communicated with the GND that Switching Power Supply exports, and microcontroller M obtains electric, normally works, and can complete various control and scheduling co-design function, when No. 1 pin of splicing ear Pfemale and splicing ear Pmale and No. 6 pin cannot not be abutted against slotting, No. 1 pin and No. 6 pin of Pmale disconnect, voltage vcc cannot pass through resistance R1, R2 dividing potential drop, No. 2 pin of resistance R2 are low level, N-channel MOS pipe Q turns off, the GND that the GND of microcontroller M and Switching Power Supply export disconnects, microcontroller M dead electricity, cannot work, any kind of control and scheduling co-design function can not be completed, thus control and protective switching device cannot close, primary circuit cannot work, avoid because current transformer and protection module patch the potential hazard of the reliability of the control and protective switching device of unreliable generation and the security of affiliated primary circuit thereof.
Fig. 3 discloses the process flow diagram of trace routine performed according to one embodiment of present invention.Fig. 3 discloses the process carrying out detecting:
First, the program in microprocessor judges the level state of this I/O port: when this level is high, and secondary circuit connects reliable, and the program in microprocessor maintains current state; When this level is low, it is unreliable that secondary circuit connects.
Now, when microprocessor detects that primary circuit disconnects, program inhibition sends the signal for closed primary circuit; When microprocessor detects that primary circuit closes, program sends the signal for disjunction primary circuit.
Like this, primary circuit cannot work, and avoids because current transformer and protection module patch the potential hazard of the reliability of the control and protective switching device of unreliable generation and the security of affiliated primary circuit thereof.
Fig. 4 discloses the schematic diagram of the protection circuit used according to one embodiment of present invention.Fig. 4 is the schematic diagram of further protection circuit.This circuit is by splicing ear Pct and resistance R_L1, and R_L2, R_L3 form.No. 1 pin of terminals P ct is connected with No. 1 pin of resistance R_L1, and No. 2 pin are connected with No. 1 pin of resistance R_L2, and No. 3 pin are connected with No. 1 pin of resistance R_L3, No. 2 pin of No. 4 pin and R_L1, No. 2 pin of R_L2, and No. 2 pin of R_L3 connect.All elements are all positioned at power base, and in splicing ear Pct and Fig. 1, four terminals of threephase current transformer Secondary Winding are connected.Resistance R_L1, the resistance of R_L2, R_L3 meets: normally patching the maintenance sample rate current under state; Improper patch state under maintain the connection of the secondary side circuit of threephase current transformer.After resistance is set; select suitable resistance; resistance both can not be had an impact to the current sample that current sensing means and protection module normally patch under state; again can improper patch state under guarantee the connection of the secondary side circuit of current transformer; thus avoid Secondary Winding coil induces very high voltage, security threat is caused to current sensing means and the person.
Fig. 5 discloses the schematic diagram of the current transducer signal treatment circuit used according to one embodiment of present invention.This electric routing resistance Ra, Rb, Rc, diode Da1, Da2, Da3, Da4, Da5, Da6 form.No. 1 pin of No. 1 pin of resistance Ra and No. 2 pin of diode Da1, diode Da2, No. 1 pin of resistance Rb, No. 2 pin of diode Db1, No. 1 pin of diode Db2, No. 1 pin of resistance Rc, No. 2 pin of diode Dc1, No. 1 pin of diode Dc2 are connected, and No. 2 pin are connected with No. 1 pin of diode Da1, No. 2 pin of diode Da2.No. 2 pin of resistance Rb are connected with No. 2 pin of No. 1 pin of diode Db1, diode Db2.No. 2 pin of resistance Rc are connected with No. 2 pin of No. 1 pin of diode Dc1, diode Dc2.All elements are all positioned at protection module.When all pin of splicing ear Pfemale in Fig. 2 and splicing ear Pmale reliably patch; like this; be positioned at signal Signal_L1, Signal_L2, Signal_L3, the Signal_Common on the splicing ear Pct of power base, namely the signal of threephase current transformer can reliably be sent in protection module.Now; Signal_L1, Signal_L2, Signal_L3 respectively and between Signal_Common resistance value be R_L1*Ra/ (R_L1+Ra), R_L2*Rb/ (R_L2+Rb), R_L3*Rc/ (R_L3+Rc); above-mentioned resistance value all can ensure to meet current sample design object; above-mentioned Signal_L1, Signal_L2, Signal_L3 signal sends microcontroller M to through subsequent process circuit, and microcontroller M can complete any kind of control and scheduling co-design function whereby.When 2 ~ No. 5 pin of the splicing ear Pfemale in Fig. 2 and splicing ear Pmale cannot not be abutted against slotting, signal Signal_L1, Signal_L2, Signal_L3, the Signal_Common be positioned on the connector Pct of power base can not be sent to protection module.Now, if there is no resistance R_L1, R_L2, R_L3, like this, Signal_L1, open a way between Signal_L2, Signal_L3 and Signal_Common, namely the secondary side circuit of current transformer is not communicated with, as aforementioned meeting causes security threat to current transformer and the person.In the present embodiment; Signal_L1, Signal_L2, Signal_L3 are respectively and add resistance R_L1, R_L2, R_L3 between Signal_Common; like this; between the Secondary Winding of threephase current transformer, resistance value is respectively R_L1, R_L2, R_L3; above-mentioned resistance value all can ensure the design object meeting current transformer and Personal Safety, thus avoids because current sensing means and protection module patch the current sensing means of the control and protective switching device of unreliable generation and the potential hazard of personal security.
The present invention proposes a kind of current sensing means secondary circuit and connect the method and apparatus detected; by the method and application of installation in device for switching particularly control and protective switching device, can avoid because current sensing means and protection module patch the potential hazard of the reliability of the device for switching of unreliable generation and the security of affiliated primary circuit thereof.It is few that current sensing means secondary circuit of the present invention connects the component number required by method and apparatus detected, and structure is simple, and reliability is high, uses and have the advantages that volume is little, cost is low in control and protective switching device.
Above-described embodiment is available to be familiar with person in the art to realize or to use of the present invention; those skilled in the art can be without departing from the present invention in the case of the inventive idea; various modifications or change are made to above-described embodiment; thus protection scope of the present invention not limit by above-described embodiment, and should be the maximum magnitude meeting the inventive features that claims are mentioned.
Claims (8)
1. current sensing means secondary circuit connects the method detected, and it is characterized in that, comprising:
At current sensing means internal placement threephase current transformer, in threephase current transformer, the second end of each mutual inductor is connected to each other formation common port, and in threephase current transformer, the first end of each current transformer is independent separately;
Arrange the first checking terminal in current sensing means inside in the mode be connected with each other, the first checking terminal is two, is arranged in the both sides of the first end of described common port and threephase current transformer;
The first end of described common port, threephase current transformer and the first checking terminal form male terminal jointly;
In the receiving terminal of protection module internal placement threephase current transformer and the receiving terminal of common port;
Arrange the second checking terminal in disjunct mode each other protection module is inner, the second checking terminal is two, is arranged in the both sides of the receiving terminal of described common port and the receiving terminal of threephase current transformer;
The receiving terminal of described common port, the receiving terminal of threephase current transformer and the second checking terminal form female terminal jointly, female terminal mates with male terminal, the receiving terminal coupling common port of common port, the first end of the receiving terminal coupling threephase current transformer of threephase current transformer, the first checking terminal coupling second checking terminal.
2. current sensing means secondary circuit as claimed in claim 1 connects the method detected, and it is characterized in that,
The length being shorter in length than the first end of described common port and threephase current transformer of described first checking terminal;
The length being shorter in length than the receiving terminal of described common port and the receiving terminal of threephase current transformer of described second checking terminal.
3. current sensing means secondary circuit as claimed in claim 1 connects the method detected, and it is characterized in that,
Detect the connection situation of the second checking terminal arranged in disjunct mode each other in protection module inside, to change the level state of the I/O port of microprocessor in protection module, the level state of this I/O port of microprocessor judges:
When primary circuit disconnects, when this level is high, microprocessor sends the signal for closed primary circuit; When this level is low, microprocessor is forbidden sending the signal for closed primary circuit;
When primary circuit is closed, when this level is high, microprocessor maintains current state; When this level is low, microprocessor sends the signal for disjunction primary circuit;
By detecting the connection of current sensing means secondary circuit, change the on off operating mode of primary circuit.
4. current sensing means secondary circuit as claimed in claim 1 connects the method detected, and it is characterized in that,
Between each Secondary Winding coil of threephase current transformer, arrange resistance, the resistance of described resistance meets:
Normally patching the maintenance sample rate current under state;
Improper patch state under maintain the connection of the secondary side circuit of threephase current transformer.
5. current sensing means secondary circuit connects the device detected, and it is characterized in that, comprising:
Threephase current transformer, is arranged on current sensing means inside, and in threephase current transformer, the second end of each mutual inductor is connected to each other formation common port, and in threephase current transformer, the first end of each current transformer is independent separately;
First checking terminal, is arranged on current sensing means inside, and the first checking terminal is connected with each other, and the first checking terminal is two, is arranged on the both sides of the first end of described common port and threephase current transformer;
Male terminal, by the first end and first of described common port, threephase current transformer, male terminal verifies that terminal is formed jointly;
Receiving terminal, is arranged on protection module inside, and receiving terminal comprises the receiving terminal of threephase current transformer and the receiving terminal of common port;
Second checking terminal, is arranged on protection module inside, and the second checking terminal is not connected each other, and the second checking terminal is two, is arranged on the both sides of the receiving terminal of described common port and the receiving terminal of threephase current transformer;
Female terminal, female terminal is formed jointly by the receiving terminal of described common port, the receiving terminal of threephase current transformer and the second checking terminal;
Wherein female terminal mates with male terminal, the receiving terminal coupling common port of common port, the first end of the receiving terminal coupling threephase current transformer of threephase current transformer, the first checking terminal coupling second checking terminal.
6. current sensing means secondary circuit as claimed in claim 5 connects the device detected, and it is characterized in that,
The length being shorter in length than the first end of described common port and threephase current transformer of described first checking terminal;
The length being shorter in length than the receiving terminal of described common port and the receiving terminal of threephase current transformer of described second checking terminal.
7. current sensing means secondary circuit as claimed in claim 5 connects the device detected, and it is characterized in that,
To disjunct second verifying that terminal carries out conduction detection each other, to change the level state of the I/O port of microprocessor in protection module, the level state of this I/O port of microprocessor judges:
When primary circuit disconnects, when this level is high, microprocessor sends the signal for closed primary circuit; When this level is low, microprocessor is forbidden sending the signal for closed primary circuit;
When primary circuit is closed, when this level is high, microprocessor maintains current state; When this level is low, microprocessor sends the signal for disjunction primary circuit;
By detecting the connection of current sensing means secondary circuit, change the on off operating mode of primary circuit.
8. current sensing means secondary circuit as claimed in claim 5 connects the device detected, and it is characterized in that,
Also comprise resistance between each Secondary Winding coil of threephase current transformer, the resistance of described resistance meets:
Normally patching the maintenance sample rate current under state;
Improper patch state under maintain the connection of the secondary side circuit of threephase current transformer.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110443019.XA CN103176027B (en) | 2011-12-26 | 2011-12-26 | Connection detection method and device for secondary circuit of current detection unit |
| US14/369,077 US9350157B2 (en) | 2011-12-26 | 2012-12-25 | Control and protection device for low-voltage electrical appliance |
| PCT/CN2012/087389 WO2013097696A1 (en) | 2011-12-26 | 2012-12-25 | Control and protection device for low-voltage electrical appliance |
| EP12862572.0A EP2800220B1 (en) | 2011-12-26 | 2012-12-25 | Control and protection device for low-voltage electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110443019.XA CN103176027B (en) | 2011-12-26 | 2011-12-26 | Connection detection method and device for secondary circuit of current detection unit |
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| CN103176027A CN103176027A (en) | 2013-06-26 |
| CN103176027B true CN103176027B (en) | 2015-05-13 |
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| CN109932675A (en) * | 2019-03-27 | 2019-06-25 | 国家电网有限公司 | Abnormal detection method of current transformer circuit |
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