CN108226846A - A kind of generic polar test circuit - Google Patents
A kind of generic polar test circuit Download PDFInfo
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- CN108226846A CN108226846A CN201810316535.8A CN201810316535A CN108226846A CN 108226846 A CN108226846 A CN 108226846A CN 201810316535 A CN201810316535 A CN 201810316535A CN 108226846 A CN108226846 A CN 108226846A
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- resistance
- optocoupler
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- luminous tube
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
A kind of generic polar test circuit, is related to electrical test field, solve the problems, such as existing for existing current transformer polarity method possibly can not Accurate Determining, it is of high cost, inconvenient for use, alternating current 220V power supply is needed to support.A kind of generic polar test circuit of the present invention includes battery, integrated circuit, four optocouplers, two luminous tubes, three diodes, 11 resistance, five capacitances, switch, wire connection terminals.In test, input signal passes through diode double limiting and capacitor filtering, and completing polarity using twin voltage comparator judges, the self-sustaining and mutually locking of two polarity instruction luminous tubes are completed using optocoupler.Circuit of the present invention is simple, clear principle, easily operated, reliable operation, small, at low cost.Circuit sensitivity is high, versatile, and power supply can measure all transformation ratio current transformer polarity in current and following power grid using 9V laminated cells, can also measure the polarity of all electromagnetic potential transformers and transformer in power grid.
Description
Technical field
The present invention relates to electrical test technical fields, and in particular to a kind of generic polar test circuit.
Background technology
Current transformer incorrect polarity can cause protective relaying maloperation, tripping accident, can also cause to measure, measure misalignment.
According to the rules, polarity test should be carried out to it before first and second circuit of current transformer access electric system.
Current transformer polarity is generally measured using dry cell and pointer gauge at present, this method is mainly in Current Mutual Inductance
The current gear or voltage gear of pointer multimeter are accessed between device secondary terminals S1, S2, by terminals P 1 of current transformer, P2 winks
Between short circuit dry cell circuit, polarity is judged according to multimeter throw of pointer situation.Secondly using current transformer integration test
Instrument measures current transformer polarity.
Tested using battery pointer gauge measuring current transformer polarity the problem is that：Multimeter throw of pointer amplitude
The small time is short, measures difficult when encountering current mutual inductor with high transforming ratio or even can not measure.In addition there are one special for this method
It is required that exactly have to pointer multimeter, it is impossible to digimer, because digital multimeter can not judge transient electrical
Pulse direction.And using comprehensive tester of current transformer measuring current transformer polarity the problem is that：Expensive equipment,
A large amount of work units are difficult to be equipped with；Instrument is heavy, and transport is inconvenient for use；Instrument using when need alternating current 220V power supply support.
Invention content
In order to solve existing for existing current transformer polarity method possibly can not Accurate Determining, it is of high cost, inconvenient for use,
The problem of alternating current 220V power supply is needed to support, the present invention provide a kind of generic polar test circuit.
The present invention is as follows for technical scheme applied to solve the technical problem：
A kind of generic polar test circuit of the present invention, including：Battery, integrated circuit, the first optocoupler, the second optocoupler,
Three optocouplers, the 4th optocoupler, the first luminous tube, the second luminous tube, the first diode, the second diode, third diode, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance,
Ten resistance, the 11st resistance, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, switch, wire connection terminal；
The P2 ends of the wire connection terminal, second resistance one end, integrated circuit foot 4., third optocoupler foot 3., the 4th optocoupler foot
3., the second capacitance cathode, third diode cathode, battery cathode, the first capacitance cathode connection；
The anode, the normal opened contact in first group of two-way contact of switch, the connection of the 9th resistance one end；
Common junction, the second capacitance cathode in first group of two-way contact of the switch, the 4th capacitance one end, the 8th resistance
One end, the second luminous tube anode, the second optocoupler foot 4., the first optocoupler foot 4., the first luminous tube anode, the 7th resistance one end,
Three capacitance one end, integrated circuit foot 8., first resistor one end connection；
Normally closed contact in the second group of two-way contact of the 9th resistance other end and switch is connect；
Common junction in the second group of two-way contact of first capacitance cathode and switch is connect；
Normal opened contact, third diode cathode, the connection of the tenth resistance one end in second group of two-way contact of the switch；
The P1 ends of the tenth resistance other end and wire connection terminal connect；
The S1 ends of the wire connection terminal, the first diode cathode, the second diode cathode, the 5th capacitance one end, the 11st
Resistance one end, integrated circuit foot are 2., 5. integrated circuit foot connects；
The S2 ends of the wire connection terminal, the first diode cathode, the second diode cathode, the 5th capacitance other end, the tenth
The one resistance other end, 3rd resistor one end, the connection of the 4th resistance one end；
3. the first resistor other end, the 3rd resistor other end are connect with integrated circuit foot；
6. the second resistance other end, the 4th resistance other end are connect with integrated circuit foot；
1. the first luminous tube cathode is connect with the first optocoupler foot；
2. 1. the first optocoupler foot is connect with third optocoupler foot；
The third optocoupler foot 2., the third capacitance other end, the 7th resistance other end, the 5th resistance one end, the second optocoupler
3. foot connects；
The integrated circuit foot is 1., 4. the 5th resistance other end, third optocoupler foot connect；
1. the second luminous tube cathode is connect with the second optocoupler foot；
2. 1. the second optocoupler foot is connect with the 4th optocoupler foot；
The 4th optocoupler foot 2., the 4th capacitance other end, the 8th resistance other end, the 6th resistance one end, the first optocoupler
3. foot connects；
The integrated circuit foot is 7., 4. the 6th resistance other end, the 4th optocoupler foot connect.
Further, test starts, will switch by position 0 press to position 1, the circuit using integrated circuit as core obtain it is electric,
At this point, the voltage between the S1 ends of wire connection terminal and S2 ends is zero, two in integrated circuit voltage comparator in-phase input end
Current potential is all higher than reverse input end current potential, and two voltage comparators all export high potential, and the first luminous tube, the second luminous tube are all located
In OFF state；
Switch is pressed by position 1 to position 2, the first capacitance puts the first optocoupler and the second optocoupler circuit by the tenth resistance
Electricity；The S1 ends of wire connection terminal, the induced voltage at S2 ends add after the first diode and the second diode limiting, the 5th capacitor filtering
The input terminal of two voltage comparators in integrated circuit；If the S1 terminal potentials of wire connection terminal are higher than first resistor and third at this time
Ohmic connection points current potential, then integrated circuit foot 1. export low potential, the first luminous tube, which is lighted, sends out green light, while third optocoupler pair
First luminous tube self-sustaining, the first optocoupler are latched the second luminous tube, illustrate that current transformer polarity mark to be measured is correct；If this
When wire connection terminal S1 terminal potentials less than the 4th resistance and second resistance tie point current potential, then 7. integrated circuit foot exports low electricity
Position, the second luminous tube, which is lighted, sends out feux rouges, while the 4th optocoupler, to the second luminous tube self-sustaining, the second optocoupler is to the first luminous tube
Locking illustrates that current transformer polarity mark to be measured is wrong.
Further, test terminates, and switch Self-resetting is to position 0, the first luminous tube, the second luminous tube self-sustaining and mutually
Lock release, battery is by the normally closed contact in second group of the 9th resistance, switch two-way contact SW-1 to the first capacitor charging, standard
Standby test next time.
Further, the integrated circuit uses LM393P；First luminous tube, Φ 3, green；Described second shines
Pipe, Φ 3 are red；First capacitance is 1mF35V, is electrolysed；Second capacitance is 1 μ F35V, is electrolysed；The third capacitance
For 1nF10V, terylene；4th capacitance be 1nF10V, terylene；5th capacitance be 100nF10V, terylene；Described first
Resistance and second resistance are 10k Ω/0.25W；The 3rd resistor, the 4th resistance are 100 Ω/0.25W；5th electricity
Resistance and the 6th resistance are 2k Ω/1W；7th resistance, the 8th resistance are 100k Ω/0.25W；9th resistance is
200Ω/1W；Tenth resistance is 2 Ω/2W；11st resistance is 68k Ω/0.25W；- the four light of first optocoupler
Coupling uses P521；First diode, the second diode and third diode use 1N4007；The wire connection terminal is
2A/50V；The battery uses 9V laminated cells.
Further, the first resistor, second resistance, 3rd resistor, the 4th resistance are used to set two in integrated circuit
The bias voltage of a voltage comparator；The 3rd resistor, the 4th resistance are used to set two voltage comparators in integrated circuit
Differentiation voltage.
Further, the switch is using 2A/50V, two groups of two-way contacts, Self-resetting three position switch；During position 0, two
Common junction in group two-way contact is connected with respective normally closed contact；During position 1, the common junction in the 1st group of two-way contact
The 2nd group of two-way contact state simultaneously is connected with its normal opened contact to remain unchanged；During position 2, public in two groups of two-way contacts connects
Point is all connected with respective normal opened contact.
Further, first luminous tube, the second luminous tube branch using the first optocoupler, the second optocoupler, third optocoupler,
4th optocoupler completes self-sustaining and mutually locking.
Further, the integrated circuit uses twin voltage comparator, and operating temperature lower limit is -25 DEG C, operating voltage model
It encloses for 2~36V.
Further, by the first capacitance of third diode protection, its reverse charging voltage is limited in 0.7V hereinafter, protecting
Card occurs without reversely charging electrical phenomena.
Further, during test, the P1 ends of wire connection terminal, P2 ends and the low-voltage side coil of current transformer to be measured are connected
It connects, the S1 ends of wire connection terminal, S2 ends is connect with the high pressure lateral coil of current transformer to be measured.
The beneficial effects of the invention are as follows：The present invention in test, by diode double limiting and capacitance filter by input signal
Wave, using twin voltage comparator complete polarity judge, using optocoupler complete two polarity instruction luminous tubes self-sustaining and mutually
Locking.Compared with existing, has the following advantages：
First, circuit sensitivity high universalizable of the invention is strong, power supply using 9V laminated cells can measure it is current and
All transformation ratio current transformer polarity in following power grid, can also measure all electromagnetic potential transformers and transformation in power grid
The polarity of device.
2nd, circuit of the present invention is simple, clear principle, easily operated, reliable operation.
3rd, circuit whole element of the invention can be fitted into the housing of a cigarette case size, small, only cigarette case
Size is highly susceptible to carrying and use.
4th, the present invention uses conventional component, of low cost, easy to spread.
Description of the drawings
Fig. 1 is a kind of generic polar test circuit figure of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of generic polar test circuit of the present invention, mainly includes battery BAT, Integrated circuit IC, the
One optocoupler P1, the second optocoupler P2, third optocoupler P3, the 4th optocoupler P4, the first luminous tube L1, the second luminous tube L2, the one or two pole
Pipe D1, the second diode D2, third diode D3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4,
Five resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11st resistance
R11, the first capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, switch SW, wire connection terminal CN.
The P2 ends of wire connection terminal CN, second resistance R2 one end, Integrated circuit IC foot 4., third optocoupler P3 feet 3., the 4th light
Coupling P4 feet 3., the second capacitance C2 cathode, third diode D3 anodes, battery BAT cathode, the first capacitance C1 cathode connection.
Battery BAT anodes, the normal opened contact in first group of two-way contact SW-1 of switch SW, the connection of the 9th resistance R9 one end.
Switch common junction in SW first group of two-way contact SW-1, the second capacitance C2 anodes, the 4th capacitance C4 one end, the
Eight resistance R8 one end, the second luminous tube L2 anodes, the second optocoupler P2 feet 4., the first optocoupler P1 feet 4., the first luminous tube L1 anodes,
7th resistance R7 one end, third capacitance C3 one end, Integrated circuit IC foot 8., first resistor R1 one end connection.
The 9th resistance R9 other ends are connect with the normally closed contact in switch second group of two-way contact SW-2 of SW.
First capacitance C1 anodes are connect with the common junction in switch second group of two-way contact SW-2 of SW.
Normal opened contact, third diode D3 cathode in second group of two-way contact SW-2 of switch SW, the tenth resistance R10 one end
Connection.
The tenth resistance R10 other ends are connect with the P1 ends of wire connection terminal CN.
The S1 ends of wire connection terminal CN, the first diode D1 anodes, the second diode D2 cathode, the 5th capacitance C5 one end,
11 resistance R11 one end, Integrated circuit IC foot are 2., 5. Integrated circuit IC foot connects.That is the S1 ends of wire connection terminal CN, the one or two pole
Pipe D1 anodes, the second diode D2 cathode, the 5th capacitance C5 one end, the 11st resistance R11 one end with Integrated circuit IC foot 2.
Connection, meanwhile, the S1 ends of wire connection terminal CN, the first diode D1 anodes, the second diode D2 cathode, the 5th capacitance C5 one end,
5. 11st resistance R11 one end is connect with Integrated circuit IC foot.
The S2 ends of wire connection terminal CN, the first diode D1 cathode, the second diode D2 anodes, the 5th capacitance C5 other ends,
The 11st resistance R11 other ends, 3rd resistor R3 one end, the connection of the 4th resistance R4 one end.
3. the first resistor R1 other ends, the 3rd resistor R3 other ends are connect with Integrated circuit IC foot.
6. the second resistance R2 other ends, the 4th resistance R4 other ends are connect with Integrated circuit IC foot.
1. first luminous tube L1 cathode are connect with the first optocoupler P1 feet.
2. 1. first optocoupler P1 feet are connect with third optocoupler P3 feet.
Third optocoupler P3 feet 2., the third capacitance C3 other ends, the 7th resistance R7 other ends, the 5th resistance R5 one end, second
3. optocoupler P2 feet connect.
Integrated circuit IC foot is 1., 4. the 5th resistance R5 other ends, third optocoupler P3 feet connect.
1. second luminous tube L2 cathode are connect with the second optocoupler P2 feet.
2. 1. second optocoupler P2 feet are connect with the 4th optocoupler P4 feet.
4th optocoupler P4 feet 2., the 4th capacitance C4 other ends, the 8th resistance R8 other ends, the 6th resistance R6 one end, first
3. optocoupler P1 feet connect.
Integrated circuit IC foot is 7., 4. the 6th resistance R6 other ends, the 4th optocoupler P4 feet connect.
A kind of generic polar test circuit of the present invention, in test, first with conducting wire by the P1 ends of wire connection terminal CN, P2
End is connect with the low-voltage side coil of current transformer to be measured, with conducting wire that the S1 ends, S2 ends and electric current to be measured of wire connection terminal CN is mutual
The high pressure lateral coil connection of sensor.
Test starts, will switch SW by position 0 press to position 1, the circuit using Integrated circuit IC as core obtain it is electric, at this point,
Voltage between the S1 ends of wire connection terminal CN and S2 ends is zero, two in Integrated circuit IC voltage comparator in-phase input end electricity
Position is all higher than reverse input end current potential, and two voltage comparators all export high potential, and the first luminous tube L1, the second luminous tube L2 are
In OFF state.
SW will be switched by position 1 quickly by (the first capacitance C1 discharge currents are big during test, and SW is switched to reduce to position 2
Contact resistance is pressed to during position 2 by position 1 and is rapidly resolutely not less than 2 seconds in 2 residence time of position), the first capacitance C1 leads to
The tenth resistance R10 is crossed to discharge to the first optocoupler P1 and the second optocoupler P2 circuits.The S1 ends of wire connection terminal CN, the induced voltage at S2 ends
Two voltages in Integrated circuit IC are added to after the first diode D1 and the second diode D2 amplitude limits, the 5th capacitance C5 filtering to compare
The input terminal of device.If the S1 terminal potentials of wire connection terminal CN are higher than first resistor R1 and 3rd resistor R3 tie point current potentials at this time,
Then 1. Integrated circuit IC foot exports low potential, and the first luminous tube L1, which is lighted, sends out green light, while third optocoupler P3 shines to first
Pipe L1 self-sustainings, the first optocoupler P1 are latched the second luminous tube L2, this just illustrates that current transformer polarity mark to be measured is correct.Such as
The S1 terminal potentials of fruit wire connection terminal CN at this time are less than the 4th resistance R4 and second resistance R2 tie point current potentials, then Integrated circuit IC foot
7. exporting low potential, the second luminous tube L2, which is lighted, sends out feux rouges, while the 4th optocoupler P4 is to the second luminous tube L2 self-sustainings, second
Optocoupler P2 is latched the first luminous tube L1, this just illustrates that current transformer polarity mark to be measured is wrong.
In order to reduce crosstalk during test, two conducting wires and S1 ends, the S2 ends company at P1 ends, the connection of P2 ends on wire connection terminal CN
Two conducting wires connect are preferably located remotely from each other, and human body should not touch p-wire.
Test terminates, and switch SW Self-resettings the first luminous tube L1, the second luminous tube L2 self-sustainings and are mutually closed to position 0
Lock releases, and battery BAT is by DE normally closed contacts in second group of the 9th resistance R9, switch SW two-way contact SW-1 to the first capacitance C1
Charging is prepared for test next time.In order to make the first capacitance C1 fully charged, the test interval should be not less than 5 seconds.
In present embodiment, the first diode D1, the second diode D2 use silicon diode, backward resistance and forward direction
Resistance is the bigger the better before conducting.
In present embodiment, for the 5th capacitance C5 for inhibiting induced voltage, capacity should be not less than 100nF.Capacity is anti-greatly
It is strong to disturb ability.
If the S1 ends of wire connection terminal CN, S2 ends and treating that the conducting wire between electricity measurer does not connect, in Integrated circuit IC
The second luminous tube L2 can be lighted by mistake after electricity.Therefore, this phenomenon is eliminated using the 11st resistance R11.Experiment discovery, the
The resistance value of 11 resistance R11 should not exceed 100k Ω, while the 11st resistance R11 also provides discharge channel for the 5th capacitance C5.
In present embodiment, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 are integrated for setting
The bias voltage of two voltage comparators in IC circuit ensures that its input terminal voltage is without departing from permission model under any circumstance
It encloses.Meanwhile 3rd resistor R3, the 4th resistance R4 are additionally operable to the differentiation voltage of two voltage comparators of setting.Differentiate that voltage more connects
Nearly bias voltage, circuit sensitivity are higher.
In present embodiment, Integrated circuit IC specifically uses LM393P.Disposable type usually may be used in Integrated circuit IC
Twin voltage comparator.In view of low temp operation, operating temperature lower limit is advisable with -25 DEG C.Integrated circuit IC operating voltage model
It encloses for 2~36V.When powering on, 8. for voltage during 2V is risen to, voltage comparator output state is unstable for Integrated circuit IC foot
It is fixed, therefore, the first luminous tube L1, the first optocoupler P1, third optocoupler P3 series arms and the second luminous tube L2, the second optocoupler P2,
The operating voltage of 4th optocoupler P4 series arms need to be in more than 4V, and voltage comparator output state is unstable in power up
Problem is just shielded.
First luminous tube L1, the second luminous tube L2 branches complete self-sustaining and mutually locking using optocoupler.Third optocoupler P3,
There are distribution capacity and resistance in the dark, distribution capacity and resistance in the darks to be likely to result in the first luminous tube L1, for the output terminal of 4th optocoupler P4
The false triggering of two luminous tube L2.Therefore, third capacitance C3, the 7th resistance R7, the 4th capacitance C4, the 8th resistance are set in circuit
R8 eliminates this possibility, makes the first luminous tube L1 and the second luminous tube L2 will not false triggering.Third capacitance C3, the 4th capacitance C4
Capacitance should not exceed 10nF, otherwise can drag down circuit sensitivity.
The generic polar test circuit operating voltage range of the present invention is wide, and up to 6~36V, battery BAT electricity can obtain
It makes full use of.With the raising of operating voltage, the first capacitance C1 discharge currents increase, while differentiate the difference of voltage and bias voltage
Value is also widened, and circuit sensitivity variation is simultaneously little.Since the difference for differentiating voltage and bias voltage is widened, circuit interference rejection ability
It improves.
When being tested, the first capacitance C1 is it is possible that reverse charging phenomenon.By set third diode D3 come
The first capacitance C1 is protected, its reverse charging voltage is limited in below 0.7V.
In present embodiment, battery BAT uses 9V laminated cells.When battery BAT voltages are less than 6V, the first luminous tube L1,
Second luminous tube L2 brightness is faint.It should be noted that when battery BAT voltages are less than 6V, due to the first luminous tube L1, the second hair
Light pipe L2 branches self-sustaining declines with locking function, and polarity detection result will misalignment.In fact for 9V laminated cells, end electricity
It forces down and is needed replacing when 7.2V.
In present embodiment, switch SW is using 2A, 50V, two groups of two-way contacts, Self-resetting, three positions.During position 0, two groups
Common junction in two-way contact is connected with respective normally closed contact；During position 1, common junction in the 1st group of two-way contact with
Its normal opened contact is connected the 2nd group of two-way contact state simultaneously and is remained unchanged；During position 2, the common junction in two groups of two-way contacts
All connected with respective normal opened contact.Benefit using Self-resetting three position switch is：Only power in test, extend electricity
The pond service life.If not using Self-resetting three position switch, forget that closing power supply can make to consume battery BAT electricity in vain after test
Amount increases testing cost.
In present embodiment, the first luminous tube L1, Φ 3, green；Second luminous tube L2, Φ 3, it is red.
In present embodiment, the first capacitance C1 is 1mF35V, is electrolysed.Second capacitance C2 is 1 μ F35V, is electrolysed.Third capacitance
C3 is 1nF10V, terylene.4th capacitance C4 be 1nF10V, terylene.5th capacitance C5 be 100nF10V, terylene.
In present embodiment, first resistor R1 and second resistance R2 are 10k Ω/0.25W.3rd resistor R3, the 4th electricity
It is 100 Ω/0.25W to hinder R4.5th resistance R5 and the 6th resistance R6 is 2k Ω/1W.7th resistance R7, the 8th resistance R8 are equal
For 100k Ω/0.25W.9th resistance R9 is 200 Ω/1W.Tenth resistance R10 is 2 Ω/2W.11st resistance R11 for 68k Ω/
0.25W。
In present embodiment, the 4th optocoupler P4 of the first optocoupler P1- use P521.
In present embodiment, the first diode D1, the second diode D2 and third diode D3 use 1N4007.
In present embodiment, wire connection terminal CN is 2A/50V.
With the application of the increase of transformer capacity in power grid and secondary rated current for the current transformer of 1A, power grid
Interior current transformer ratio is increasing.Current transformer polarity chron is measured using battery, pointer gauge, current transformer ratio is got over
Its big secondary smaller polarity test of output current is more difficult.Electric current conversion can be carried out, exactly will once apply electric current when testing
Divided by current transformer ratio obtains secondary current.Current transformer polarity chron is measured using battery, pointer gauge, is found when secondary
Polarity detection can actually survey no-load voltage ratio below 1000/1 with regard to highly difficult when electric current is less than 3mA.Voltage comparator inputs biased electrical
It is nA grades to flow, and two input terminal pressure differences can just be overturn in mV grades of output terminals, can be sensitive by circuit easily using voltage comparator
Degree improves more than an order of magnitude.In present embodiment, circuit can survey no-load voltage ratio and be up to more than 10000/1, can to current and
The current transformer of all no-load voltage ratios carries out polarity test in following power grid.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of generic polar test circuit, which is characterized in that including：Battery, integrated circuit, the first optocoupler, the second optocoupler,
Three optocouplers, the 4th optocoupler, the first luminous tube, the second luminous tube, the first diode, the second diode, third diode, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance,
Ten resistance, the 11st resistance, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, switch, wire connection terminal；
The P2 ends of the wire connection terminal, second resistance one end, integrated circuit foot 4., third optocoupler foot 3., the 4th optocoupler foot 3.,
Two capacitance cathode, third diode cathode, battery cathode, the connection of the first capacitance cathode；
The anode, the normal opened contact in first group of two-way contact of switch, the connection of the 9th resistance one end；
Common junction, the second capacitance cathode in first group of two-way contact of the switch, the 4th capacitance one end, the 8th resistance one
End, the second luminous tube anode, the second optocoupler foot 4., the first optocoupler foot 4., the first luminous tube anode, the 7th resistance one end, third
Capacitance one end, integrated circuit foot 8., first resistor one end connection；
Normally closed contact in the second group of two-way contact of the 9th resistance other end and switch is connect；
Common junction in the second group of two-way contact of first capacitance cathode and switch is connect；
Normal opened contact, third diode cathode, the connection of the tenth resistance one end in second group of two-way contact of the switch；
The P1 ends of the tenth resistance other end and wire connection terminal connect；
The S1 ends of the wire connection terminal, the first diode cathode, the second diode cathode, the 5th capacitance one end, the 11st resistance
One end, integrated circuit foot are 2., 5. integrated circuit foot connects；
The S2 ends of the wire connection terminal, the first diode cathode, the second diode cathode, the 5th capacitance other end, the 11st electricity
Hinder the other end, 3rd resistor one end, the connection of the 4th resistance one end；
3. the first resistor other end, the 3rd resistor other end are connect with integrated circuit foot；
6. the second resistance other end, the 4th resistance other end are connect with integrated circuit foot；
1. the first luminous tube cathode is connect with the first optocoupler foot；
2. 1. the first optocoupler foot is connect with third optocoupler foot；
The third optocoupler foot 2., the third capacitance other end, the 7th resistance other end, the 5th resistance one end, the second optocoupler foot 3.
Connection；
The integrated circuit foot is 1., 4. the 5th resistance other end, third optocoupler foot connect；
1. the second luminous tube cathode is connect with the second optocoupler foot；
2. 1. the second optocoupler foot is connect with the 4th optocoupler foot；
The 4th optocoupler foot 2., the 4th capacitance other end, the 8th resistance other end, the 6th resistance one end, the first optocoupler foot 3.
Connection；
The integrated circuit foot is 7., 4. the 6th resistance other end, the 4th optocoupler foot connect.
2. a kind of generic polar test circuit according to claim 1, which is characterized in that test starts, and will switch by position
Set to 0 by position 1, the circuit using integrated circuit as core obtain it is electric, at this point, the voltage between the S1 ends of wire connection terminal and S2 ends is
Zero, all higher than reverse input end current potential, two voltages compare two voltage comparator homophase input terminal potentials in integrated circuit
Device all exports high potential, and the first luminous tube, the second luminous tube are all in OFF state；
Switch is pressed by position 1 to position 2, the first capacitance discharges to the first optocoupler and the second optocoupler circuit by the tenth resistance；
The S1 ends of wire connection terminal, the induced voltage at S2 ends are added to after the first diode and the second diode limiting, the 5th capacitor filtering
The input terminal of two voltage comparators in integrated circuit；If the S1 terminal potentials of wire connection terminal are higher than first resistor and third electricity at this time
Tie point current potential is hindered, then 1. integrated circuit foot exports low potential, and the first luminous tube, which is lighted, sends out green light, while third optocoupler is to the
One luminous tube self-sustaining, the first optocoupler are latched the second luminous tube, illustrate that current transformer polarity mark to be measured is correct；If at this time
The S1 terminal potentials of wire connection terminal are less than the 4th resistance and second resistance tie point current potential, then 7. integrated circuit foot exports low potential,
Second luminous tube, which is lighted, sends out feux rouges, while the 4th optocoupler, to the second luminous tube self-sustaining, the second optocoupler closes the first luminous tube
Lock illustrates that current transformer polarity mark to be measured is wrong.
3. a kind of generic polar test circuit according to claim 2, which is characterized in that test terminates, and switchs Self-resetting
To position 0, the first luminous tube, the second luminous tube self-sustaining and mutual lock release, battery is by the 9th resistance, second group of switch
Normally closed contact in two-way contact SW-1 prepares test next time to the first capacitor charging.
4. a kind of generic polar test circuit according to claim 1, which is characterized in that the integrated circuit uses
LM393P；First luminous tube, Φ 3, green；Second luminous tube, Φ 3 are red；First capacitance is 1mF35V,
Electrolysis；Second capacitance is 1 μ F35V, is electrolysed；The third capacitance be 1nF10V, terylene；4th capacitance is
1nF10V, terylene；5th capacitance be 100nF10V, terylene；The first resistor and second resistance be 10k Ω/
0.25W；The 3rd resistor, the 4th resistance are 100 Ω/0.25W；5th resistance and the 6th resistance are 2k Ω/1W；
7th resistance, the 8th resistance are 100k Ω/0.25W；9th resistance is 200 Ω/1W；Tenth resistance is 2
Ω/2W；11st resistance is 68k Ω/0.25W；- the four optocoupler of first optocoupler uses P521；Described 1st
Pole pipe, the second diode and third diode use 1N4007；The wire connection terminal is 2A/50V；The battery is folded using 9V
Layer battery.
5. a kind of generic polar test circuit according to claim 1, which is characterized in that the first resistor, the second electricity
Resistance, 3rd resistor, the 4th resistance are used to set the bias voltage of two voltage comparators in integrated circuit；The 3rd resistor,
4th resistance is used to set the differentiation voltage of two voltage comparators in integrated circuit.
6. a kind of generic polar test circuit according to claim 1, which is characterized in that it is described switch using 2A/50V,
Two groups of two-way contacts, Self-resetting three position switch；During position 0, common junction in two groups of two-way contacts normally closed connects with respective
Point is connected；During position 1, the common junction in the 1st group of two-way contact connects the 2nd group of two-way contact state simultaneously with its normal opened contact
It remains unchanged；During position 2, the common junction in two groups of two-way contacts is all connected with respective normal opened contact.
7. a kind of generic polar test circuit according to claim 1, which is characterized in that first luminous tube, second
Luminous tube branch completes self-sustaining and mutually locking using the first optocoupler, the second optocoupler, third optocoupler, the 4th optocoupler.
8. a kind of generic polar test circuit according to claim 1, which is characterized in that the integrated circuit is using double electricity
Comparator is pressed, operating temperature lower limit is -25 DEG C, and operating voltage range is 2~36V.
9. a kind of generic polar test circuit according to claim 1, which is characterized in that pass through third diode protection
Its reverse charging voltage is limited in 0.7V hereinafter, ensureing to occur without reversely charging electrical phenomena by one capacitance.
10. a kind of generic polar test circuit according to claim 1, which is characterized in that during test, by wire connection terminal
P1 ends, P2 ends are connect with the low-voltage side coil of current transformer to be measured, by the S1 ends of wire connection terminal, S2 ends and Current Mutual Inductance to be measured
The high pressure lateral coil connection of device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810316535.8A CN108226846B (en) | 2018-04-10 | 2018-04-10 | General polarity test circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810316535.8A CN108226846B (en) | 2018-04-10 | 2018-04-10 | General polarity test circuit |
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| CN108226846B CN108226846B (en) | 2020-02-07 |
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| CN108226846B (en) | 2020-02-07 |
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