CN108092246A - Micro-capacitance sensor protective relaying device - Google Patents
Micro-capacitance sensor protective relaying device Download PDFInfo
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- CN108092246A CN108092246A CN201810055008.6A CN201810055008A CN108092246A CN 108092246 A CN108092246 A CN 108092246A CN 201810055008 A CN201810055008 A CN 201810055008A CN 108092246 A CN108092246 A CN 108092246A
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- resistance
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
Abstract
The invention belongs to technical field of power systems, and in particular to a kind of micro-capacitance sensor protective relaying device and guard method；Device Zhong Mei roads signal acquisition judgement system includes first switch successively according to electric signal direction of transfer, sample circuit, second switch, first holding circuit, 3rd switch, the first branch for including the 4th switch and the second holding circuit being arranged in parallel and the second branch including the 5th switch and the 3rd holding circuit, subtraction circuit, signed magnitude arithmetic(al) circuit, voltage comparator circuit, the 6th switch and controller；This method controls the sequential of each switch, and input voltage is more than the total degree and read-around ratio of threshold voltage, output tripping control signal in monitoring voltage comparison circuit；The present invention can not only switch between both of which; and equally there is the timeliness of quick fast tripping protection; the generation of switching signal problem can also be avoided missing, and can avoid by mistake being judged as power grid unsteady-state distortion noise signal the generation of switching signal problem.
Description
The application is application for a patent for invention《A kind of micro-capacitance sensor protective relaying device and guard method》Divisional application.
The original bill applying date：2016-08-31.
Original bill application number：2016107843229.
Original bill denomination of invention：A kind of micro-capacitance sensor protective relaying device and guard method.
Technical field
The invention belongs to technical field of power systems, and in particular to a kind of micro-capacitance sensor protective relaying device and guard method.
Background technology
Micro-capacitance sensor (Micro-Grid) refer to by distributed generation resource, energy storage device, energy conversion device, load, monitoring and
The small-sized electric system of the compositions such as protective device, self-contr ol, protection and the autonomous system of management can be realized by being one, both
It can be incorporated into the power networks with external electrical network and (be connected to external electrical online operation), it can also isolated operation (disengaging external electrical network independence
Operation).
The normal operation of micro-capacitance sensor is, it is necessary to which protective relaying device escorts.Due to traditional relay protection device not
Possesses the conversion function of " pattern of being incorporated into the power networks-isolated operation pattern ", therefore traditional relay protection device can't adapt to micro- electricity
Above-mentioned double net switching modes of net；In addition, the distributed generation resource for having large number of distance very short inside micro-capacitance sensor, it is easy to make
It increased dramatically into short circuit current flow, if at this point, corresponding circuit cannot be disconnected in time, will have for the safety in production of micro-capacitance sensor
Larger harm, since traditional relay protection device is designed both for the bulk power grid line applications of 10KV and more than voltage,
It is difficult to meet 400V in timeliness and following micro-capacitance sensor quickly cuts off the protection demand of failure.
For above-mentioned two aspects problem, the patent of invention of Application No. 201110258295.9《Micro-capacitance sensor relay protection side
Method and device》, by detecting the opening and closing state of the micro-capacitance sensor connected between micro-capacitance sensor and bulk power grid switch, judge micro-capacitance sensor
Operating status when micro-capacitance sensor is in isolated operation state, makes micro-capacitance sensor protective relaying device operate in micro-capacitance sensor relay protection
State when micro-capacitance sensor is in grid-connected state, makes micro-capacitance sensor protective relaying device enter conventional relay protection pattern.The hair
It is bright to switch suitable for micro-capacitance sensor between " pattern of being incorporated into the power networks-isolated operation pattern ", short circuit during for micro-capacitance sensor isolated operation
Electric current compared with it is grid-connected when it is small but the characteristics of increase more drastically, using starting comprising figure variable and the failure of 2 calculating process electricity
Entire Outlet time can be controlled the Outlet time that tripping in 10ms is realized in 3ms or so, improve and hasten soon by flow algorithm
The timeliness of disconnected protection；However, this method does not account for following two problems：
Firstth, the process of sampling is it is possible that miss switching signal；
Secondth, this mode may be missed is judged as switching signal by power grid unsteady-state distortion noise signal.
Two above problem, there are no find related data to be well solved.
The content of the invention
In order to solve the problems, such as two above, the present invention devises a kind of micro-capacitance sensor protective relaying device and guard method, no
It can only switch between " pattern of being incorporated into the power networks-isolated operation pattern ", and equally there is the timeliness of quick fast tripping protection,
Importantly, compared with the patent of invention of Application No. 201110258295.9, switching signal can not only be avoided missing and asked
The generation of topic, and can avoid by mistake being judged as power grid unsteady-state distortion noise signal the generation of switching signal problem.
The object of the present invention is achieved like this：
A kind of micro-capacitance sensor protective relaying device, including 2nRoad signal acquisition judgement system, per road signal acquisition judgement system
Including first switch successively according to electric signal direction of transfer, sample circuit, second switch, the first holding circuit, the 3rd switchs, and
Join the first branch and the second branch set, the first branch includes the 4th switch and the second holding circuit, the second branch bag
Include the 5th switch and the 3rd holding circuit, subtraction circuit, signed magnitude arithmetic(al) circuit, voltage comparator circuit, the 6th switch and
Controller, the controller are used to that first switch, second switch, third switch, the 4th switch, the 5th switch and the 6th to be controlled to open
The break-make of pass, the comparative result of receiving voltage comparison circuit output, output tripping control signal；
The first switch includes two kinds of working conditions of open and close, closing time 20/2nms；
The sample circuit includes operational amplifier U1, and the in-phase input end of operational amplifier U1 is connected with first switch,
Inverting input is directly connected to output terminal；
The second switch includes being closed and two kinds of working conditions of ground connection, closing time are not less than 20/2nMs, and cover the
One switch-closed time；
First holding circuit includes operational amplifier U2, and in-phase input end and the first switch of operational amplifier U2 connect
It connects, and passes through capacitance C2 and be grounded, inverting input is directly connected to output terminal；
3rd switch includes connecting the first branch, connection the second branch and hanging three kinds of working conditions；
4th switch includes being closed and being grounded two kinds of working conditions；
Second holding circuit includes operational amplifier U3, and the in-phase input end of operational amplifier U3 and the 3rd switch connect
It connects, and passes through capacitance C3 and be grounded, inverting input is directly connected to output terminal；
5th switch includes being closed and being grounded two kinds of working conditions；
3rd holding circuit includes operational amplifier U4, and the in-phase input end of operational amplifier U4 and the 3rd switch connect
It connects, and passes through capacitance C4 and be grounded, inverting input is directly connected to output terminal；
The subtraction circuit includes operational amplifier U5, and the in-phase input end of operational amplifier U5 is r1 by resistance value
Resistance R53 concatenation operation amplifiers U4 output terminal, by resistance value be r1 resistance R54 be grounded, operational amplifier U5's is anti-
Phase input terminal is the output terminal of the resistance R51 concatenation operation amplifiers U3 of r1 by resistance value, passes through the resistance R52 that resistance value is r1 and connects
Connect the output terminal of operational amplifier U5；
The absolute value circuit includes operational amplifier U6 and operational amplifier U7, the inverting input of operational amplifier U6
It is the output terminal of the resistance R61 concatenation operation amplifiers U5 of r2 by resistance value, passes through the resistance R62 connection absolute values that resistance value is r2
The output terminal of circuit, by the output terminal of diode VD1 concatenation operation amplifiers U6, the output terminal of operational amplifier U6 passes through two
The output terminal of pole pipe VD2 connection absolute value circuits；The in-phase input end of operational amplifier U6 is grounded by resistance R63；Computing is put
The in-phase input end of big device U7 passes through the output terminal of resistance R71 concatenation operation amplifiers U5 that resistance value is r2, operational amplifier U7
Inverting input by resistance value be r2 resistance R72 connection absolute value circuits output terminal, pass through diode VD3 concatenation operations
The output terminal of amplifier U7, the output terminal that the output terminal of operational amplifier U7 passes through diode VD4 connection absolute value circuits；
The voltage comparator circuit includes operational amplifier U8, and the inverting input of operational amplifier U8 sets threshold value electricity
Pressure, the output terminal of the in-phase input end connection absolute value circuit of operational amplifier U8, the output terminal of operational amplifier U8 pass through the
Six switch connection controllers；
When first switch, second switch, third switch, the 4th switch and the 5th switch the control within the two neighboring cycle
Sequence is：
S1, first switch are closed, second switch is closed, the 3rd switch connects the first branch, the 4th switch is closed, the 5th opens
Close conjunction, the 6th switch is closed；
S2, first switch disconnect, second switch is grounded, the 3rd switch connection is hanging, the 4th switch closure, the 5th switch connect
Ground, the 6th switch disconnect；
S3, first switch are closed, second switch is closed, the 3rd switch connects the second branch, the 4th switch is closed, the 5th opens
Close conjunction, the 6th switch is closed；
S4, first switch disconnect, second switch is grounded, the 3rd switch connection is hanging, the 4th switch is grounded, the 5th switch closes
It closes, the 6th switch disconnects.
Above-mentioned micro-capacitance sensor protective relaying device, further includes current-to-voltage converting circuit；
The current-to-voltage converting circuit includes operational amplifier U9, and the inverting input of operational amplifier U9 passes through resistance
R91 is grounded, and passes through the output terminal of resistance R92 concatenation operation amplifiers U9；The in-phase input end of operational amplifier U9 passes through series connection
Resistance R93 and resistance R94 ground connection, input current flows between resistance R93 and resistance R94；The output of operational amplifier U9
End connection first switch.
Above-mentioned micro-capacitance sensor protective relaying device, in unlike signal gathers judgement system, operational amplifier U8 anti-phase inputs
Hold the threshold voltage set different.
The threshold voltage is：
Wherein, Δ U is the threshold voltage at sampling, and k is coefficient, and U is the normal voltage at sampling, UmaxIt is maximum for voltage
Value, UminFor voltage minimum.
A kind of micro-capacitance sensor relay protecting method realized on more than micro-capacitance sensor protective relaying device, comprises the following steps：
Step S1, during monitoring control devices are per signal acquisition judgement system all the way voltage comparator circuit export as a result, from every
Input voltage is more than the situation start recording of threshold voltage in one signal acquisition judgement system voltage comparator circuit；
Step S2, with step S1 start recordings at the time of, in the range of the delay time of tripping control signal permission,
Obtain the result of a series of voltage comparison circuit output；
Step S3, judge in this series of voltage comparison circuit output result, if：
Input voltage continues to exceed N1 times more than the number of threshold voltage in voltage comparator circuit, enters step S4；
Input voltage does not continue to exceed N1 times more than the number of threshold voltage in voltage comparator circuit, and controller does not export
Trip control signal；
Step S4, judge in this series of voltage comparison circuit output result, if：
The total degree that input voltage is more than threshold voltage in voltage comparator circuit enters step S5 more than N2 times；
Input voltage is not above N2 times more than the total degree of threshold voltage in voltage comparator circuit, and controller does not export jump
Lock control signal；
Step S5, controller output tripping control signal.
Advantageous effect：
Firstth, since the present invention also has through collection voltages or current signal, and tripping is relatively exported compared with threshold value
The function of control signal, therefore equally have the function of to switch between " pattern of being incorporated into the power networks-isolated operation pattern "；
Secondth, since the present invention includes 2nRoad signal acquisition judgement system, for 8 control signals, it is possible to realize 256
Road gathers, for power frequency 50Hz alternating currents, it is only necessary to which 0.078125ms can complete once to sample, for 36 times are adopted
Sample (36 times of patent of invention that are equal to Application No. 201110258295.9), also only used time 2.8125ms, slightly less than applies
Number for 201110258295.9 patent of invention 3ms, therefore equally with quick fast tripping protection timeliness in addition effect also
It increases；
3rd, since micro-capacitance sensor protective relaying device of the present invention sets 2nRoad signal acquisition judgement system, in signal all the way
Acquisition judgement system has just completed the moment of signal acquisition, and another way signal acquisition judgement system can directly take over signal acquisition
Work, therefore can accomplish continuous sampling, avoid missing the generation of switching signal problem；
4th, it is big to input voltage in voltage comparator circuit due in micro-capacitance sensor relay protecting method of the present invention, adding
In the read-around ratio of threshold voltage and the monitoring of total degree, and basis is combined under the interference of unsteady-state distortion noise signal, voltage
Input voltage is more than the read-around ratio of threshold voltage in comparison circuit and total degree is difficult characteristic more than threshold value, therefore can keep away
Exempt to miss the generation that power grid unsteady-state distortion noise signal is judged as to switching signal problem.
Description of the drawings
Fig. 1 is the system schematic of micro-capacitance sensor protective relaying device of the present invention.
Fig. 2 be subtraction circuit before circuit connection diagram.
Fig. 3 is subtraction circuit and its circuit connection diagram afterwards.
Fig. 4 is current-to-voltage converting circuit.
Specific embodiment
The specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
Specific embodiment one
The present embodiment is micro-capacitance sensor protective relaying device embodiment.
The micro-capacitance sensor protective relaying device of the present embodiment, system schematic are as shown in Figure 1.The micro-capacitance sensor protective relaying device
Including 2nRoad signal acquisition judgement system is opened including first successively per road signal acquisition judgement system according to electric signal direction of transfer
It closes, sample circuit, second switch, the first holding circuit, the 3rd switch, the first branch and the second branch being arranged in parallel are described
The first branch includes the 4th switch and the second holding circuit, and the second branch includes the 5th switch and the 3rd holding circuit, subtraction fortune
Circuit, signed magnitude arithmetic(al) circuit are calculated, voltage comparator circuit, the 6th switch and controller, the controller are opened for control first
Pass, second switch, the 3rd switch, the 4th switch, the 5th switch and the 6th switch on-off, the output of receiving voltage comparison circuit
Comparative result, output tripping control signal；
The first switch includes two kinds of working conditions of open and close, closing time 20/2nms；
The sample circuit includes operational amplifier U1, and the in-phase input end of operational amplifier U1 is connected with first switch,
Inverting input is directly connected to output terminal；
The second switch includes being closed and two kinds of working conditions of ground connection, closing time are not less than 20/2nMs, and cover the
One switch-closed time；
First holding circuit includes operational amplifier U2, and in-phase input end and the first switch of operational amplifier U2 connect
It connects, and passes through capacitance C2 and be grounded, inverting input is directly connected to output terminal；
3rd switch includes connecting the first branch, connection the second branch and hanging three kinds of working conditions；
4th switch includes being closed and being grounded two kinds of working conditions；
Second holding circuit includes operational amplifier U3, and the in-phase input end of operational amplifier U3 and the 3rd switch connect
It connects, and passes through capacitance C3 and be grounded, inverting input is directly connected to output terminal；
5th switch includes being closed and being grounded two kinds of working conditions；
3rd holding circuit includes operational amplifier U4, and the in-phase input end of operational amplifier U4 and the 3rd switch connect
It connects, and passes through capacitance C4 and be grounded, inverting input is directly connected to output terminal；
First switch, sample circuit, second switch, the first holding circuit, the 3rd switch, the 4th switch, second keep electricity
The circuit diagram that road, the 5th switch and the 3rd holding circuit are formed is as shown in Figure 2；
The subtraction circuit includes operational amplifier U5, and the in-phase input end of operational amplifier U5 is r1 by resistance value
Resistance R53 concatenation operation amplifiers U4 output terminal, by resistance value be r1 resistance R54 be grounded, operational amplifier U5's is anti-
Phase input terminal is the output terminal of the resistance R51 concatenation operation amplifiers U3 of r1 by resistance value, passes through the resistance R52 that resistance value is r1 and connects
Connect the output terminal of operational amplifier U5；
The absolute value circuit includes operational amplifier U6 and operational amplifier U7, the inverting input of operational amplifier U6
It is the output terminal of the resistance R61 concatenation operation amplifiers U5 of r2 by resistance value, passes through the resistance R62 connection absolute values that resistance value is r2
The output terminal of circuit, by the output terminal of diode VD1 concatenation operation amplifiers U6, the output terminal of operational amplifier U6 passes through two
The output terminal of pole pipe VD2 connection absolute value circuits；The in-phase input end of operational amplifier U6 is grounded by resistance R63；Computing is put
The in-phase input end of big device U7 passes through the output terminal of resistance R71 concatenation operation amplifiers U5 that resistance value is r2, operational amplifier U7
Inverting input by resistance value be r2 resistance R72 connection absolute value circuits output terminal, pass through diode VD3 concatenation operations
The output terminal of amplifier U7, the output terminal that the output terminal of operational amplifier U7 passes through diode VD4 connection absolute value circuits；
The voltage comparator circuit includes operational amplifier U8, and the inverting input of operational amplifier U8 sets threshold value electricity
Pressure, the output terminal of the in-phase input end connection absolute value circuit of operational amplifier U8, the output terminal of operational amplifier U8 pass through the
Six switch connection controllers；
The circuit diagram that subtraction circuit, absolute value circuit, voltage comparator circuit, the 6th switch and controller are formed is such as
Shown in Fig. 3；
When first switch, second switch, third switch, the 4th switch and the 5th switch the control within the two neighboring cycle
Sequence is：
S1, first switch are closed, second switch is closed, the 3rd switch connects the first branch, the 4th switch is closed, the 5th opens
Close conjunction, the 6th switch is closed；
S2, first switch disconnect, second switch is grounded, the 3rd switch connection is hanging, the 4th switch closure, the 5th switch connect
Ground, the 6th switch disconnect；
S3, first switch are closed, second switch is closed, the 3rd switch connects the second branch, the 4th switch is closed, the 5th opens
Close conjunction, the 6th switch is closed；
S4, first switch disconnect, second switch is grounded, the 3rd switch connection is hanging, the 4th switch is grounded, the 5th switch closes
It closes, the 6th switch disconnects.
Specific embodiment two
The present embodiment is micro-capacitance sensor protective relaying device embodiment.
The micro-capacitance sensor protective relaying device of the present embodiment on the basis of specific embodiment one, further includes Current Voltage and turns
Change circuit；
The current-to-voltage converting circuit is as shown in figure 4, the current-to-voltage converting circuit includes operational amplifier U9, computing
The inverting input of amplifier U9 is grounded by resistance R91, passes through the output terminal of resistance R92 concatenation operation amplifiers U9；Computing
The in-phase input end of amplifier U9 is grounded by the resistance R93 and resistance R94 of series connection, and input current is from resistance R93 and resistance R94
Between flow into；The output terminal connection first switch of operational amplifier U9.
After adding current-to-voltage converting circuit, voltage can be not only monitored, but also electric current can be supervised
It surveys, enriches monitoring means.
Specific embodiment three
The present embodiment is micro-capacitance sensor protective relaying device embodiment.
The micro-capacitance sensor protective relaying device of the present embodiment, on the basis of specific embodiment one, is further limited to difference
In signal acquisition judgement system, the threshold voltage that operational amplifier U8 inverting inputs are set is different.
This parameter setting, it is contemplated that different by setting the problem of the voltage threshold weighted of out of phase
Threshold voltage realized in operational amplifier U8, input voltage and threshold voltage directly compared with, without being carried out in controller
Computing simplifies operation time, improves execution efficiency.
Specific embodiment four
The present embodiment is micro-capacitance sensor protective relaying device embodiment.
The micro-capacitance sensor protective relaying device of the present embodiment on the basis of specific embodiment one, further limits threshold value electricity
It presses and is：
Wherein, Δ U is the threshold voltage at sampling, and k is coefficient, and U is the normal voltage at sampling, UmaxIt is maximum for voltage
Value, UminFor voltage minimum.
Specific embodiment five
The present embodiment is micro-capacitance sensor relay protecting method embodiment.
The micro-capacitance sensor relay protecting method of the present embodiment is realized, this method bag on more than micro-capacitance sensor protective relaying device
Include following steps：
Step S1, during monitoring control devices are per signal acquisition judgement system all the way voltage comparator circuit export as a result, from every
Input voltage is more than the situation start recording of threshold voltage in one signal acquisition judgement system voltage comparator circuit；
Step S2, with step S1 start recordings at the time of, in the range of the delay time of tripping control signal permission,
Obtain the result of a series of voltage comparison circuit output；
Step S3, judge in this series of voltage comparison circuit output result, if：
Input voltage continues to exceed N1 times more than the number of threshold voltage in voltage comparator circuit, enters step S4；
Input voltage does not continue to exceed N1 times more than the number of threshold voltage in voltage comparator circuit, and controller does not export
Trip control signal；
Step S4, judge in this series of voltage comparison circuit output result, if：
The total degree that input voltage is more than threshold voltage in voltage comparator circuit enters step S5 more than N2 times；
Input voltage is not above N2 times more than the total degree of threshold voltage in voltage comparator circuit, and controller does not export jump
Lock control signal；
Step S5, controller output tripping control signal.
In the present embodiment, it is continuous more than threshold voltage to input voltage in voltage comparator circuit just because of adding
The monitoring of number and total degree, and combine according under the interference of unsteady-state distortion noise signal, electricity is inputted in voltage comparator circuit
The read-around ratio and total degree pressed more than threshold voltage are difficult the characteristic more than threshold value, therefore can be to avoid by mistake by power grid unstable state
Distortion noise signal is judged as the generation of switching signal problem.
It should be noted that in the embodiment above, as long as reconcilable technical solution can carry out permutation and combination, this
Field technology personnel can be possible to according to the mathematical knowledge limit of permutation and combination, and therefore, the present invention is no longer to permutation and combination
Technical solution afterwards is illustrated one by one, but it is understood that presently disclosed for the technical solution after permutation and combination.
Claims (1)
1. micro-capacitance sensor protective relaying device, spy are, including 2nRoad signal acquisition judgement system differentiates system per road signal acquisition
System includes first switch successively according to electric signal direction of transfer, and sample circuit, second switch, the first holding circuit, the 3rd switchs,
The first branch and the second branch being arranged in parallel, the first branch include the 4th switch and the second holding circuit, the second branch
Including the 5th switch and the 3rd holding circuit, subtraction circuit, signed magnitude arithmetic(al) circuit, voltage comparator circuit, the 6th switch
And controller, the controller are used to control first switch, second switch, third switch, the 4th switch, the 5th switch and the 6th
It switches on-off, the comparative result of receiving voltage comparison circuit output, output tripping control signal；
The first switch includes two kinds of working conditions of open and close, closing time 20/2nms；
The sample circuit includes operational amplifier U1, and the in-phase input end of operational amplifier U1 is connected with first switch, reverse phase
Input terminal is directly connected to output terminal；
The second switch includes being closed and two kinds of working conditions of ground connection, closing time are not less than 20/2nMs, and cover first and open
Close closing time；
First holding circuit includes operational amplifier U2, and the in-phase input end of operational amplifier U2 is connected with first switch,
And pass through capacitance C2 and be grounded, inverting input is directly connected to output terminal；
3rd switch includes connecting the first branch, connection the second branch and hanging three kinds of working conditions；
4th switch includes being closed and being grounded two kinds of working conditions；
Second holding circuit includes operational amplifier U3, and the in-phase input end of operational amplifier U3 and the 3rd switch connect,
And pass through capacitance C3 and be grounded, inverting input is directly connected to output terminal；
5th switch includes being closed and being grounded two kinds of working conditions；
3rd holding circuit includes operational amplifier U4, and the in-phase input end of operational amplifier U4 and the 3rd switch connect,
And pass through capacitance C4 and be grounded, inverting input is directly connected to output terminal；
The subtraction circuit includes operational amplifier U5, and the in-phase input end of operational amplifier U5 passes through electricity that resistance value is r1
The output terminal of R53 concatenation operation amplifiers U4 is hindered, is grounded by the resistance R54 that resistance value is r1, the reverse phase of operational amplifier U5 is defeated
Enter output terminal of the end by resistance value for the resistance R51 concatenation operation amplifiers U3 of r1, pass through the resistance R52 connections that resistance value is r1 and transport
Calculate the output terminal of amplifier U5；
The absolute value circuit includes operational amplifier U6 and operational amplifier U7, and the inverting input of operational amplifier U6 passes through
Resistance value is the output terminal of the resistance R61 concatenation operation amplifiers U5 of r2, passes through the resistance R62 connection absolute value circuits that resistance value is r2
Output terminal, by the output terminal of diode VD1 concatenation operation amplifiers U6, the output terminal of operational amplifier U6 passes through diode
The output terminal of VD2 connection absolute value circuits；The inverting input of operational amplifier U6 is grounded by resistance R63；Operational amplifier
The in-phase input end of U7 is the output terminal of the resistance R71 concatenation operation amplifiers U5 of r2 by resistance value, and operational amplifier U7's is anti-
Phase input terminal is the output terminal of the resistance R72 connection absolute value circuits of r2 by resistance value, passes through diode VD3 concatenation operations and amplifies
The output terminal of device U7, the output terminal that the output terminal of operational amplifier U7 passes through diode VD4 connection absolute value circuits；
The voltage comparator circuit includes operational amplifier U8, and the inverting input of operational amplifier U8 sets threshold voltage, fortune
The output terminal of the in-phase input end connection absolute value circuit of amplifier U8 is calculated, the output terminal of operational amplifier U8 passes through the 6th switch
Connect controller；
The control sequential of first switch, second switch, third switch, the 4th switch and the 5th switch within the two neighboring cycle
For：
S1, first switch are closed, second switch is closed, the 3rd switch connection first branch, the 4th switch are closed, the 5th switch closes
It closes, the 6th switch is closed；
S2, first switch disconnect, second switch is grounded, the 3rd switch connects hanging, the 4th switch closure, the 5th switch is grounded,
6th switch disconnects；
S3, first switch are closed, second switch is closed, the 3rd switch connection the second branch, the 4th switch are closed, the 5th switch closes
It closes, the 6th switch is closed；
S4, first switch disconnect, second switch is grounded, the 3rd switch connection is hanging, the 4th switch is grounded, the 5th switch is closed,
6th switch disconnects；
In unlike signal gathers judgement system, the threshold voltage that operational amplifier U8 inverting inputs are set is different, described
Threshold voltage is：
<mrow>
<mi>&Delta;</mi>
<mi>U</mi>
<mo>=</mo>
<mi>k</mi>
<mo>&lsqb;</mo>
<mi>U</mi>
<mo>-</mo>
<mfrac>
<mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
<mo>-</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
</mrow>
<mn>2</mn>
</mfrac>
<mo>&rsqb;</mo>
</mrow>
Wherein, Δ U is the threshold voltage at sampling, and k is coefficient, and U is the normal voltage at sampling, UmaxFor voltage max,
UminFor voltage minimum.
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| CN108092247B (en) | 2019-06-11 |
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