CN107884146A - A kind of equipment medium leak detecting device - Google Patents
A kind of equipment medium leak detecting device Download PDFInfo
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- CN107884146A CN107884146A CN201610874036.1A CN201610874036A CN107884146A CN 107884146 A CN107884146 A CN 107884146A CN 201610874036 A CN201610874036 A CN 201610874036A CN 107884146 A CN107884146 A CN 107884146A
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- 238000001914 filtration Methods 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 6
- 210000004899 c-terminal region Anatomy 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical group [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
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Abstract
The invention belongs to field of measuring technique, and in particular to a kind of equipment medium leak detecting device.The device includes power supply module, anti-phase input end module, homophase input end module, voltage comparison module, alarm output module, robust mould interference module, hysteresis module.The device interface can be directly used for the motor internal dielectric leakage detection of unit, and device performance is better than original device, and switch motion resistance is adjustable, can be widely applied to the equipment leakage detection of different insulative impedance threshold.
Description
Technical field
The invention belongs to field of measuring technique, and in particular to a kind of equipment medium leak detecting device.
Background technology
Leak detecting device is made up of detection probe (two electrodes) and secondary meter two parts.Wherein detection probe is gold
Belong to part, its aging, the probability of failure are minimum；Secondary meter is the modular member of electronic component composition, and ageing failure will
Gradually increase with the time, detection means reaches the phase in longevity (80000 hours) at present, and the equipment country of origin has stopped production, domestic and international market
On be difficult to search out and meet technical parameter requirement, interface identical substitute products.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of equipment medium leak detecting device, device interface can be used directly
Detected in dielectric leakage, switch motion resistance is adjustable, can be widely applied to the equipment leakage detection of different insulative impedance threshold.
In order to solve the above technical problems, a kind of equipment medium leak detecting device of the present invention, the device include power supply module,
Anti-phase input end module, homophase input end module, voltage comparison module, alarm output module, robust mould interference module, hysteresis mould
Block, power supply module are drawn supply port and powered for modules, and draw the first port that first port is connected to the second module；
The supply port of the power end connection power supply module of anti-phase input end module, the first port connection voltage of anti-phase input end module
The first port of comparison module and the first port of robust mould interference module；The power end connection power supply module of voltage comparison module
Supply port, voltage comparison module first port connection robust mould interference module first port and anti-phase input end module
First port；The second port and homophase input end module of the second port connection robust mould interference module of voltage comparison module
First port；The second port of the 3rd port connection hysteresis module and the first end of alarm output module of voltage comparison module
Mouthful；The supply port of the power end connection power supply module of homophase input end module；The first port connection of homophase input end module
In the second port of voltage comparison module and the second port of robust mould interference module；The second port of homophase input end module is stagnant
Return the first port of module；The supply port of alarm output module power end connection power supply module, the first of alarm output module
Port is connected to the 3rd port and the second port of hysteresis module of voltage comparison module.
Described includes X2 terminal blocks, and X2 terminal block first interfaces lead to power end, connect the feeder ear of power supply module；
X2 terminal blocks second interface leads to the second port of anti-phase input end module by resistance R1 and resistance R4；X2 terminals ranked third
Interface leads to power end by resistance R2 and resistance R3, connects the feeder ear of power supply module；Resistance R1 and resistance R4 wire
It is connected with resistance R2 and resistance R3 wire by wire；X2 terminals ranked fourth interface and pass through resistance R5, resistance R6 and resistance R7
Ground connection；X2 terminals ranked fourth interface and lead to anti-phase input end module first port by resistance R5；Resistance R6's and resistance R7
Wire leads to the second port of anti-phase input end module.
In-phase input end modular power source end by resistance R8, resistance R9, fine setting module 14, lead to homophase input end module
Second port；In-phase input end modular power source end leads to the first port of homophase input end module by resistance R8；Same phase
Input modular power source end is grounded by resistance R8, resistance R9, fine setting module and resistance R10.
The voltage comparator DA1 of voltage comparison module reverse input end leads to voltage comparison module by resistance R12
First port；Voltage comparator DA1 input in the same direction leads to the second port of voltage comparison module by resistance R11；
Voltage comparator DA1 power end is grounded by electric capacity C5, and voltage comparator DA1 power end leads to electricity by resistance R14
Press the power end of comparison module；Voltage comparator DA1 earth terminal ground connection；Voltage comparator DA1 output end leads to voltage
3rd port of comparison module.
Robust mould interference module is electric capacity C4, and electric capacity C4 one end leads to the first port of robust mould interference module, another
End leads to the second port of robust mould interference module.
Hysteresis module is resistance R13, and resistance R13 one end leads to the first port of hysteresis module, and the other end leads to stagnant
Return the second port of module.
The 5th interface and the 6th interface of the X2 terminal blocks of alarm output module draw connecting valve respectively, switch by after
Electrical equipment K1 control opening and closings；Relay K1 upper ends lead to power end, and power end is connected to relay by Opposite direction connection diode VD5
Device K1 lower ends；Relay K1 lower ends are connected to triode VT1 C-terminal；Triode VT1 B ends lead to alarm by resistance R15
The first port of output module；Triode VT1 B ends are grounded by electrochemical capacitor C6；Triode VT1 B ends pass through resistance R16
Ground connection；Triode VT1 E ends ground connection.
Described power supply module includes full-wave rectification block, RC filtration modules, ripple module I, ripple module ii, and all-wave is whole
Flow module connects RC filtration modules, ripple module I, the first port of ripple module ii and leads to feeder ear respectively；RC filters mould
Block first port passes sequentially through electric capacity C2 and C1 ground connection, and the first port of power supply module is led between C2 and C1；Full-wave rectification
Module has two lead-out wire connection X1 terminal blocks, wherein the first lead-out wire leads to power supply by diode VD2 and breaker F1
End, the first lead-out wire are grounded by Opposite direction connection diode VD4；Second lead-out wire is by passing through diode VD1 and breaker F1
Feeder ear is led to, the second lead-out wire is grounded by Opposite direction connection diode VD3；The connection power supply of RC filtration modules first port
End, first port are grounded by electric capacity C2 and C1, and the first port of power supply module is led between C2 and C1；Ripple module I
Single port is grounded by electric capacity C8, and is grounded by electric capacity C7, and is grounded by electrochemical capacitor C3；Ripple module ii first port
It is grounded by electric capacity C9.
The advantageous effects of the present invention are：The device interface can be directly used for the motor internal dielectric leakage inspection of unit
Survey, device performance is better than original device, and switch motion resistance is adjustable, can be widely applied to the equipment leakage of different insulative impedance threshold
Detection.
Brief description of the drawings
Fig. 1 is equipment medium leak detecting device schematic diagram；
Fig. 2 is that equipment medium leak detecting device uses schematic diagram.
In figure：：1- power supply modules；2- anti-phase input end modules；3- homophase input end modules；4- voltage comparison modules；5-
Alarm output module；6- robust mould interference modules；7- hysteresis modules；8- full-wave rectification blocks；9-RC filtration modules；10- ripples
Module I；11- ripple module iis；12- detection probes；13- range setup modules；14- finely tunes module；12- detection probes；15-X1
Terminal block；16-X2 terminal blocks；17- adjustable resistances；18- ranges set switch.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
A kind of equipment medium leak detecting device of the present invention, the device include power supply module 1, anti-phase input end module 2, same
Mutually input end module 3, voltage comparison module 4, alarm output module 5, robust mould interference module 6, hysteresis module 7, power supply module 1
Draw supply port to power for modules, and draw the first port that first port is connected to the second module；Inverting input
The supply port of the power end connection power supply module 1 of module 2, the first port of anti-phase input end module 2 connect voltage ratio compared with mould
The first port of block 4 and the first port of robust mould interference module 6；The power end connection power supply module 1 of voltage comparison module 4
Supply port, the first port and anti-phase input end module of the first port connection robust mould interference module 6 of voltage comparison module 4
2 first port；The second port and in-phase input end of the second port connection robust mould interference module 6 of voltage comparison module 4
The first port of module 3；The second port and alarm output module 5 of the 3rd port connection hysteresis module 7 of voltage comparison module 4
First port；The supply port of the power end connection power supply module 1 of homophase input end module 3；The of homophase input end module 3
Single port is connected to the second port of voltage comparison module 4 and the second port of robust mould interference module 6；Homophase input end module
The first port of 3 second port hysteresis module 7；The power end of alarm output module 5 connects the supply port of power supply module 1, report
The first port of alert output module 5 is connected to the 3rd port and the second port of hysteresis module 7 of voltage comparison module 4.
Power supply module 1 includes full-wave rectification block 8, RC filtration modules 9, ripple module I 10, ripple module ii 11, all-wave
Rectification module 8 connects RC filtration modules 9, ripple module I 10, the first port of ripple module ii 11 and leads to feeder ear respectively；
The first port of RC filtration modules 9 passes sequentially through electric capacity C2 and C1 ground connection, and the first end of power supply module 1 is led between C2 and C1
Mouthful.Full-wave rectification block 8 has two lead-out wire connection X1 terminal blocks 15, to connect 220V Alternating Current Power Supplies, wherein first draws
Line leads to feeder ear by diode VD2 and breaker F1, and the first lead-out wire is grounded by Opposite direction connection diode VD4；The
For two lead-out wires by leading to feeder ear by diode VD1 and breaker F1, the second lead-out wire passes through Opposite direction connection diode
VD3 is grounded.The first port of RC filtration modules 9 connects feeder ear, and first port is grounded by electric capacity C2 and C1, drawn between C2 and C1
Go out for the first port of power supply module 1.The first port of ripple module I 10 is grounded by electric capacity C8, and is grounded by electric capacity C7, and
It is grounded by electrochemical capacitor C3.The first port of ripple module ii 11 is grounded by electric capacity C9.
Alternating current 220V exports direct current 27V through transformer pressure-reducing after full-wave rectification block 8, powered for whole instrument.In module
It is respectively RC filtration modules 9, ripple module 10 and ripple module 11 to set three-level filtering, makes direct current supply steady.
Power supply module 1 is connected with anti-phase input end module 2, and mould is filtered using the resistance in anti-phase input end module 2 and RC
Block 9 forms RC filter circuits.
Anti-phase input end module 2 includes X2 terminal blocks 16, and the first interface of X2 terminal blocks 16 leads to power end, connection power supply
The feeder ear of module 1；The second interface of X2 terminal blocks 16 leads to the second of anti-phase input end module 2 by resistance R1 and resistance R4
Port；The interface of X2 terminal blocks 16 the 3rd leads to power end by resistance R2 and resistance R3, connects the feeder ear of power supply module 1；
Resistance R1 and resistance R4 wire are connected with resistance R2 and resistance R3 wire by wire；The interface of X2 terminal blocks 16 the 4th passes through
Resistance R5, resistance R6 and resistance R7 ground connection；The interface of X2 terminal blocks 16 the 4th leads to anti-phase input end module 2 by resistance R5
Single port；Resistance R6 and resistance R7 wire lead to the second port of anti-phase input end module 2.Detection probe 12 is connected to X2
In the 4th interface and the 7th interface, when insulaion resistance is reduced to preset resistive value between detection probe 12, pass through warning output mould
The output alarm of block 5.Range setup module 13 is short by the stitch first interface in X2 terminal blocks 16 and second interface, the 3rd interface
Connect and realize that range ability is set.
Anti-phase input end module 2 is connected with the inverting input of voltage comparison module 4.
The power end of homophase input end module 3 by resistance R8, resistance R9, fine setting module 14, lead to in-phase input end mould
The second port of block 3；The power end of homophase input end module 3 leads to the first port of homophase input end module 3 by resistance R8；
The power end of homophase input end module 3 is grounded by resistance R8, resistance R9, fine setting module 14 and resistance R10.Determine the electricity of in-phase end
Threshold value is pressed, while the fine setting of range ability is realized by fine setting module 14.Fine setting module 14 is adjustable resistance W1.
The voltage comparator DA1 of voltage comparison module 4 reverse input end leads to voltage comparison module by resistance R12
4 first port；Voltage comparator DA1 input in the same direction leads to the second end of voltage comparison module 4 by resistance R11
Mouthful；Voltage comparator DA1 power end is grounded by electric capacity C5, and voltage comparator DA1 power end is led to by resistance R14
The power end of voltage comparison module 4；Voltage comparator DA1 earth terminal ground connection；Voltage comparator DA1 output end leads to electricity
Press the 3rd port of comparison module 4.Voltage comparison module 4 compares between anti-phase input end module 2 and homophase input end module 3
Resistance, when homophase input terminal voltage is more than anti-phase input terminal voltage, high level is exported, is exported and reported by alarm output module 5
It is alert.Voltage comparison module 4 is connected with anti-phase input end module 2, homophase input end module 3, alarm output module 5.
Robust mould interference module 6 is electric capacity C4, and electric capacity C4 one end leads to the first port of robust mould interference module 6, separately
One end leads to the second port of robust mould interference module 6.Robust mould interference module 6 and anti-phase input end module 2, homophase input
End module 3, voltage comparison module 4 are connected, and in in-phase end and end of oppisite phase shunt capacitance, interference is eliminated by filtering.
Hysteresis module 7 is resistance R13, and resistance R13 one end leads to the first port of hysteresis module 7, and the other end is led to
The second port of hysteresis module 7.Hysteresis module 7 connects with homophase input end module 3, voltage comparison module 4, alarm output module 5
Connect, in the output end serial Feedback resistance of comparator, form hysteresis loop, prevent signal interference or input voltage in relatively threshold value
Neighbouring minor variations cause output alarm transition.
The 5th interface and the 6th interface of the X2 terminal blocks 16 of alarm output module 5 draw connecting valve respectively, and switch is logical
Cross relay K1 control opening and closings.Relay K1 upper ends lead to power end, and power end is connected to by Opposite direction connection diode VD5
Relay K1 lower ends；Relay K1 lower ends are connected to triode VT1 C-terminal；Triode VT1 B ends are led to by resistance R15
The first port of alarm output module 5；Triode VT1 B ends are grounded by electrochemical capacitor C6；Triode VT1 B ends pass through electricity
Hinder R16 ground connection；Triode VT1 E ends ground connection.It is defeated that alarm output module 5 receives the high level sent from voltage comparison module 4
Go out alarm, the automatic control system for receiving alarm is transferred to by the 5th interface in X2 terminal blocks 16 and the 6th interface.
Equipment medium leak detecting device is briefly discussed below with reference to Fig. 2：
Detection probe 12：In the equipment that need to carry out dielectric leakage detection, the interface of X2 terminals the 4th and are connected to
Seven interfaces.
X1 terminal blocks 15：First interface, second interface access 220V AC power to secondary meter.
The interface of X2 terminal blocks 16 the 4th and the 7th interface connecting detection probe 12, the 5th interface, the 6th interface are by relay
Warning output.＞ 20M Ω when relay disconnects, the Ω of ＜ 10 when relay closes
Adjustable resistance 17：For adjusting amplifier in-phase end current potential, that is, compare threshold value；Can be according to the insulation impedance of distinct device
Threshold value regulation resistance is applied to the measurement of distinct device insulaion resistance.Realize that range ability is finely tuned.Adjustable resistance in Fig. 2
17, the adjustable resistance W1 in module 14 is finely tuned in corresponding diagram 1, passes through the resistance that knob rotation changes W1 resistance.
Range sets switch 18：Two switch S1 and S2, realize four range ability adjustment.
Range in Fig. 2 sets switch 18, range setup module 13 in corresponding diagram 1, X2 terminals in range setup module 13
The first port of row 16 and the relation pair of second port answer range to set the S1 of switch 18, the first port of X2 terminal blocks 16 and the
The relation pair of three ports answers range to set the S2 of switch 18, and the first port and second port short circuit S1 of X2 terminal blocks 16 are 1,
Anyway it is 1 for the first port and the 3rd port short circuit S2 of 0, X2 terminal blocks 16, otherwise is 0.Specifically it see the table below：
| Sequence number | S1 | S2 | Act resistance |
| 1 | 0 | 0 | (5250~6550) k Ω |
| 2 | 1 | 0 | (1800~2200) k Ω |
| 3 | 0 | 1 | (290~430) k Ω |
| 4 | 1 | 1 | (110~210) k Ω |
Each electronic component parameter is as follows：
Electrodeless electric capacity：C1(0.1μF)、C2(0.1μF)、C4(0.68μF)、C5(0.68μF)、C7(0.68μF)、C8(0.68
μF)、C9(0.68μF)；
Electrochemical capacitor：C3(2200μF)、C6(100μF)；
Resistance：R1(187kΩ)、R2(54.2kΩ)、R3(20kΩ)、R4(78.8kΩ)、R5(511kΩ)、R6(511k
Ω)、R7(100kΩ)、R8(100kΩ)、R9(95.3kΩ)、R10(1.2kΩ)、R11(51kΩ)、R12(51kΩ)、R13
(3M)、R14(240)、R15(10kΩ)、R16(1.5kΩ)；
Adjustable resistance：W1(10kΩ)；
Breaker：F1 (rated current 0.5A)；
Diode：VD1, VD2, VD3, VD4, VD5 model are IN4007；
Triode：VT1 models BC337；
Transformer：X1 (primary AC187-242 level 27V DC)；
Voltage comparator：DA1 model 140y Д 17；
Relay：K1 model DS2Y-S-DC 24V.
During work, this circuit is using precision operational-amplifier composition comparator, when the interface of X2 terminal blocks 16 the 4th and the 7th
When the apparatus insulated resistance that interface is connect reduces, signal input part voltage reduces, and comparator end of oppisite phase voltage reduces, when less than same
During phase terminal voltage, the interface of comparator the 6th output high level, triode ON, relay closure, output alarm signal；Conversely,
When insulaion resistance increases, the increase of signal input part voltage, the anti-phase terminal voltage increase of comparator, when more than in-phase end voltage,
The interface of comparator the 6th exports low level, triode cut-off, and relay disconnects.
Claims (8)
- A kind of 1. equipment medium leak detecting device, it is characterised in that：The device includes power supply module (1), inverting input mould It is block (2), homophase input end module (3), voltage comparison module (4), alarm output module (5), robust mould interference module (6), stagnant Module (7) is returned, power supply module (1) is drawn supply port and powered for modules, and draws first port and be connected to the second module First port；The supply port of the power end connection power supply module (1) of anti-phase input end module (2), anti-phase input end module (2) the first port of first port connection voltage comparison module (4) and the first port of robust mould interference module (6)；Voltage The supply port of the power end connection power supply module (1) of comparison module (4), the first port connection of voltage comparison module (4) are anti- The first port of DM EMI module (6) and the first port of anti-phase input end module (2)；The second of voltage comparison module (4) The second port of port connection robust mould interference module (6) and the first port of homophase input end module (3)；Voltage comparison module (4) the second port of the 3rd port connection hysteresis module (7) and the first port of alarm output module (5)；In-phase input end The supply port of the power end connection power supply module (1) of module (3)；The first port of homophase input end module (3) is connected to electricity Press the second port of comparison module (4) and the second port of robust mould interference module (6)；The second of homophase input end module (3) The first port of port hysteresis module (7)；The supply port of alarm output module (5) power end connection power supply module (1), alarm The first port of output module (5) is connected to the 3rd port of voltage comparison module (4) and the second port of hysteresis module (7).
- A kind of 2. equipment medium leak detecting device according to claim 1, it is characterised in that：Described includes X2 terminals Arrange (16), X2 terminal blocks (16) first interface leads to power end, the feeder ear of connection power supply module (1)；X2 terminal blocks (16) Second interface leads to the second port of anti-phase input end module (2) by resistance R1 and resistance R4；X2 terminal blocks (16) the 3rd Interface leads to power end, the feeder ear of connection power supply module (1) by resistance R2 and resistance R3；Resistance R1's and resistance R4 leads Line is connected with resistance R2 and resistance R3 wire by wire；The interface of X2 terminal blocks (16) the 4th by resistance R5, resistance R6 and Resistance R7 is grounded；The interface of X2 terminal blocks (16) the 4th leads to anti-phase input end module (2) first port by resistance R5；Resistance R6 and resistance R7 wire lead to the second port of anti-phase input end module (2).
- A kind of 3. equipment medium leak detecting device according to claim 2, it is characterised in that：Homophase input end module (3) power end passes through resistance R8, resistance R9, fine setting module 14, the second port for leading to homophase input end module (3)；Same phase Input end module (3) power end leads to the first port of homophase input end module (3) by resistance R8；Homophase input end module (3) power end is grounded by resistance R8, resistance R9, fine setting module (14) and resistance R10.
- A kind of 4. equipment medium leak detecting device according to claim 3, it is characterised in that：Voltage comparison module (4) Voltage comparator DA1 reverse input end the first ports of voltage comparison module (4) is led to by resistance R12；Voltage ratio Input in the same direction compared with device DA1 leads to the second port of voltage comparison module (4) by resistance R11；Voltage comparator DA1's Power end is grounded by electric capacity C5, and voltage comparator DA1 power end leads to voltage comparison module (4) by resistance R14 Power end；Voltage comparator DA1 earth terminal ground connection；Voltage comparator DA1 output end leads to voltage comparison module (4) 3rd port.
- A kind of 5. equipment medium leak detecting device according to claim 4, it is characterised in that：Robust mould interference module (6) it is electric capacity C4, electric capacity C4 one end leads to the first port of robust mould interference module (6), and the other end leads to robust mould and done Disturb the second port of module (6).
- A kind of 6. equipment medium leak detecting device according to claim 5, it is characterised in that：Hysteresis module (7) is electricity R13 is hindered, resistance R13 one end leads to the first port of hysteresis module (7), and the other end leads to the second end of hysteresis module (7) Mouthful.
- A kind of 7. equipment medium leak detecting device according to claim 6, it is characterised in that：Alarm output module (5) X2 terminal blocks (16) the 5th interface and the 6th interface draw connecting valve respectively, switch passes through relay K1 control opening and closings； Relay K1 upper ends lead to power end, and power end is connected to relay K1 lower ends by Opposite direction connection diode VD5；Relay K1 lower ends are connected to triode VT1 C-terminal；Triode VT1 B ends lead to the of alarm output module (5) by resistance R15 Single port；Triode VT1 B ends are grounded by electrochemical capacitor C6；Triode VT1 B ends are grounded by resistance R16；Triode VT1 E ends ground connection.
- A kind of 8. equipment medium leak detecting device according to claim 7, it is characterised in that：Described power supply module (1) full-wave rectification block (8), RC filtration modules (9), ripple module I (10), ripple module ii (11), full-wave rectification mould are included Block (8) connects RC filtration modules (9), ripple module I (10), the first port of ripple module ii (11) and leads to power supply respectively End；RC filtration modules (9) first port passes sequentially through electric capacity C2 and C1 ground connection, and power supply module (1) is led between C2 and C1 First port；Full-wave rectification block (8) has two lead-out wire connection X1 terminal blocks (15), wherein the first lead-out wire passes through diode VD2 and breaker F1 leads to feeder ear, and the first lead-out wire is grounded by Opposite direction connection diode VD4；Second lead-out wire passes through Feeder ear is led to by diode VD1 and breaker F1, the second lead-out wire is grounded by Opposite direction connection diode VD3；RC is filtered Ripple module (9) first port connects feeder ear, and first port is grounded by electric capacity C2 and C1, and power supply mould is led between C2 and C1 The first port of block (1)；Ripple module I (10) first port is grounded by electric capacity C8, and is grounded by electric capacity C7, and passes through electricity Solve electric capacity C3 ground connection；Ripple module ii (11) first port is grounded by electric capacity C9.
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| CN107884146A true CN107884146A (en) | 2018-04-06 |
| CN107884146B CN107884146B (en) | 2024-05-14 |
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| JPH04301732A (en) * | 1991-03-29 | 1992-10-26 | Tatsuta Electric Wire & Cable Co Ltd | Leakage detection device |
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| JPH09113398A (en) * | 1995-10-17 | 1997-05-02 | Tatsuta Electric Wire & Cable Co Ltd | Liquid leakage detector |
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