CN207037001U - Ground fault detection device - Google Patents
Ground fault detection device Download PDFInfo
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- CN207037001U CN207037001U CN201721009627.9U CN201721009627U CN207037001U CN 207037001 U CN207037001 U CN 207037001U CN 201721009627 U CN201721009627 U CN 201721009627U CN 207037001 U CN207037001 U CN 207037001U
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- 238000001514 detection method Methods 0.000 title claims abstract description 11
- 229910052754 neon Inorganic materials 0.000 claims abstract description 12
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011148 porous material Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 241000272470 Circus Species 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 abstract description 8
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009979 protective mechanism Effects 0.000 description 1
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Abstract
Ground fault detection device, belongs to power system monitoring control field, and the utility model is to solve the problems, such as that carrying out earth leakage protective using blown fuse mode is present.The utility model includes NE555 time-base integrated circuits, circuit breaker Q S, neon lamp NH, current transformer TA, resistance R1~R6, slide rheostat RP, electric capacity C1~C2, diode VD1~VD4, triode VT1~VT2, voltage-regulator diode VS, loudspeaker BL, A.C. contactor KM and auxiliary reclay KA；When Three-hole socket CZ leaks electricity, occurs short circuit current on ground wire, leakage current forms loop via Three-hole socket CZ earth terminal and R3 (R4), VD3 (VD4) and live wire L (zero line N), and NH lights；The leakage current is detected that loudspeaker BL carries out audible alarm by TA；Current supply circuit of the 220V power supplys for load is cut off simultaneously.
Description
Technical field
The utility model belongs to power system monitoring control field, is related to grounding technology.
Background technology
In powering load, Three-hole socket is widely used, and three holes of Three-hole socket are hung down into isosceles triangle, drift angle hole
Straight to be connected upwards with public ground wire or public connecting to neutral line, the ground wire (or zero line) of different sockets can only be in parallel, must not connect, and two
Two hole of base angle left side connecting to neutral lines of waist, the right are started to exchange fire line.
In actual applications when household electrical appliance serious drain, when short-circuit electric leakage particularly occurs, the guarantor of load appliance
The working earthing of shield ground connection and transformer to the single phase poaer supply that load appliance is powered to forming short circuit, as long as the now electricity in circuit
Stream reaches the blowout current of fuse, and the fuse on live wire will fuse rapidly, the load appliance of serious drain is cut off electricity
Source.
Using this earth leakage protective mechanism, only can just be blown a fuse under electric leakage is serious to a certain extent, if only
It is slightly to leak electricity, fuse fails to reach fusing degree, then load appliance can be constantly in abnormal operating state, be chronically at
This working condition can make load appliance reduce service life, and user of service and the presence for being unaware of drain conditions can not
Solves slight leakage condition in time.
The content of the invention
The purpose of the utility model is to solve the problems, such as that carrying out earth leakage protective using blown fuse mode is present, there is provided
A kind of ground fault detection device.
Ground fault detection device described in the utility model includes circuit breaker Q S, neon lamp NH, current transformer TA, resistance R1
~R4, slide rheostat RP, electric capacity C1, diode VD1~VD4, triode VT1~VT2, voltage-regulator diode VS, loudspeaker BL, friendship
Flow contactor KM and auxiliary reclay KA；
220V AC powers are load supplying by circuit breaker Q S, the normally opened main contacts of A.C. contactor KM；Circuit breaker Q S,
The live wire L of supply line connects a Three-hole socket CZ isosceles jack and two respectively between the normally opened main contacts of A.C. contactor KM
Pole pipe VD3 negative electrode；Zero line N connects Three-hole socket CZ another isosceles jack and diode VD4 negative electrode respectively；
Current transformer TA primary coil is cased with the ground wire of Three-hole socket CZ apical pore connection；Three-hole socket CZ top
Hole connection neon lamp NH one end, the neon lamp NH other end connect resistance R3 one end and resistance R4 one end simultaneously, resistance R3's
Other end connection diode VD3 anode, resistance R4 other end connection diode VD4 anode；
One end of current transformer TA secondary coils connects electric capacity C1 one end, triode VT1 emitter stage, voltage stabilizing simultaneously
Diode VS anode and loudspeaker BL negative pole power supply terminal, and be grounded；Relay among loudspeaker BL positive pole power supply terminal connection
One end of device KA normally opened contacts；
The other end connection diode VD1 of current transformer TA secondary coils anode, diode VD1 negative electrode connection are slided
A dynamic rheostat RP fixing end, slide rheostat RP another fixing end and its movable end connect the another of electric capacity C1 simultaneously
One end and triode VT1 base stage, triode VT1 colelctor electrode connect resistance R1 one end and auxiliary reclay KA coils simultaneously
One end；
Resistance R1 other end connecting triode VT2 base stage, triode VT2 emitter stage connect voltage-regulator diode simultaneously
VS negative electrode and resistance R2 one end, triode VT2 colelctor electrode connect one end and two poles of A.C. contactor KM coils simultaneously
Pipe VD2 anode；
+ 6V dc sources connect simultaneously the other ends of auxiliary reclay KA coils, A.C. contactor KM coils the other end,
The other end of diode VD2 negative electrode, the resistance R2 other end and auxiliary reclay KA normally opened contacts.
Preferably ,+6V dc sources are derived from supply line between circuit breaker Q S, the normally opened main contacts of A.C. contactor KM, fire
Line L and zero line N connects the both ends of transformer T primary coils respectively, and the both ends of transformer T secondary coils connect the two of rectifier bridge UR respectively
Individual ac input end, rectifier bridge UR cathode power supply output end output+6V dc sources, rectifier bridge UR negative power supply output end
Ground connection.
Preferably, rectifier bridge UR is the single phase bridge type rectifier circu formed using four diodes.
The beneficial effects of the utility model：Ground fault detection device described in the utility model is using simple and practical discrete
Element is built, stable performance, when detecting the earth fault that zero line (ground wire) leaks electricity, makes neon lamp light, loudspeaker
Alarm, while the power supply supply to load is cut off, to carry out electric leakage maintenance in time, with the safe to use of proof load and use
Life-span.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of ground fault detection device described in the utility model.
Embodiment
Embodiment of the present utility model is described in detail below with reference to drawings and Examples, whereby to the utility model
How application technology means solve technical problem, and the implementation process for reaching technique effect can fully understand and implement according to this.
If it should be noted that do not form conflict, each feature in each embodiment and each embodiment in the utility model
It can be combined with each other, the technical scheme formed is within the scope of protection of the utility model.
Embodiment：Ground fault detection device includes circuit breaker Q S, neon lamp NH, current transformer TA, resistance R1~R4, cunning
Dynamic rheostat RP, electric capacity C1, diode VD1~VD4, triode VT1~VT2, voltage-regulator diode VS, loudspeaker BL, ac contactor
Device KM and auxiliary reclay KA；
220V AC powers are load supplying by circuit breaker Q S, the normally opened main contacts of A.C. contactor KM；Circuit breaker Q S,
The live wire L of supply line connects a Three-hole socket CZ isosceles jack and two respectively between the normally opened main contacts of A.C. contactor KM
Pole pipe VD3 negative electrode；Zero line N connects Three-hole socket CZ another isosceles jack and diode VD4 negative electrode respectively；
Current transformer TA primary coil is cased with the ground wire of Three-hole socket CZ apical pore connection；Three-hole socket CZ top
Hole connection neon lamp NH one end, the neon lamp NH other end connect resistance R3 one end and resistance R4 one end simultaneously, resistance R3's
Other end connection diode VD3 anode, resistance R4 other end connection diode VD4 anode；
One end of current transformer TA secondary coils connects electric capacity C1 one end, triode VT1 emitter stage, voltage stabilizing simultaneously
Diode VS anode and loudspeaker BL negative pole power supply terminal, and be grounded；Relay among loudspeaker BL positive pole power supply terminal connection
One end of device KA normally opened contacts；
The other end connection diode VD1 of current transformer TA secondary coils anode, diode VD1 negative electrode connection are slided
A dynamic rheostat RP fixing end, slide rheostat RP another fixing end and its movable end connect the another of electric capacity C1 simultaneously
One end and triode VT1 base stage, triode VT1 colelctor electrode connect resistance R1 one end and auxiliary reclay KA coils simultaneously
One end；
Resistance R1 other end connecting triode VT2 base stage, triode VT2 emitter stage connect voltage-regulator diode simultaneously
VS negative electrode and resistance R2 one end, triode VT2 colelctor electrode connect one end and two poles of A.C. contactor KM coils simultaneously
Pipe VD2 anode；
+ 6V dc sources connect simultaneously the other ends of auxiliary reclay KA coils, A.C. contactor KM coils the other end,
The other end of diode VD2 negative electrode, the resistance R2 other end and auxiliary reclay KA normally opened contacts.
Operation principle：When Three-hole socket CZ normal works are without electric leakage, no current on ground wire, then neon lamp NH do not work, electric current
The imperceptible electric currents of transformer TA, then VT1 base stages are without bias voltage, VT1 cut-offs, and KA coils both ends are high voltage, KA coils
Must not be electric, KA normally opened contacts remain open, and loudspeaker BL does not ring；Due to VT1 current collections extremely high voltage, then VT2 base stages loading biasing
Voltage turn-on, KM coils obtain electric, and its normally opened main contacts closure, 220V power supplys are normally load supplying.
When Three-hole socket CZ leaks electricity, there is short circuit current on ground wire, leakage current connects via Three-hole socket CZ's
Ground terminal and R3 (R4), VD3 (VD4) form loop with live wire L (zero line N), and NH lights, while the leakage current is detected by TA,
TA secondary output current, the electric current is through VD1 rectifications, and it is conducting VT1 is overturn by cut-off, and VT2 is then section by conducting upset
Only.Now, KA coils obtain electric, and KM coil losing electricities, then KA normally opened contacts close, and loudspeaker BL carries out audible alarm；The normally opened masters of KM
Contact recovers to disconnect, and cut-out 220V power supplys are the current supply circuit of load.
Based on above-mentioned analysis, as long as this technological means of present embodiment causes Three-hole socket to leak electricity, i.e. carry out sound
Light alarm, prompting is repaired, while cuts off current supply circuit to protect the Electrical Safety of load.
Although the embodiment disclosed by the utility model is as above, described content is only to facilitate understand this practicality
New and use embodiment, is not limited to the utility model.Skill in any the utility model art
Art personnel, can be in the formal and details of implementation on the premise of the spirit and scope disclosed by the utility model are not departed from
On make any modification and change, but scope of patent protection of the present utility model, must still be defined with appended claims
Scope be defined.
Claims (3)
1. ground fault detection device, it is characterised in that including circuit breaker Q S, neon lamp NH, current transformer TA, resistance R1~
R4, slide rheostat RP, electric capacity C1, diode VD1~VD4, triode VT1~VT2, voltage-regulator diode VS, loudspeaker BL, exchange
Contactor KM and auxiliary reclay KA；
220V AC powers are load supplying by circuit breaker Q S, the normally opened main contacts of A.C. contactor KM；In circuit breaker Q S, exchange
The live wire L of supply line connects a Three-hole socket CZ isosceles jack and diode respectively between the normally opened main contacts of contactor KM
VD3 negative electrode；Zero line N connects Three-hole socket CZ another isosceles jack and diode VD4 negative electrode respectively；
Current transformer TA primary coil is cased with the ground wire of Three-hole socket CZ apical pore connection；Three-hole socket CZ apical pore connects
Neon lamp NH one end is connect, the neon lamp NH other end connects resistance R3 one end and resistance R4 one end simultaneously, and resistance R3's is another
End connection diode VD3 anode, resistance R4 other end connection diode VD4 anode；
One end of current transformer TA secondary coils connects electric capacity C1 one end, triode VT1 emitter stage, the pole of voltage stabilizing two simultaneously
Pipe VS anode and loudspeaker BL negative pole power supply terminal, and be grounded；Loudspeaker BL positive pole power supply terminal connection auxiliary reclay KA
One end of normally opened contact；
The other end connection diode VD1 of current transformer TA secondary coils anode, diode VD1 negative electrode connection, which is slided, to be become
A device RP fixing end is hindered, slide rheostat RP another fixing end and its movable end connect the electric capacity C1 other end simultaneously
With triode VT1 base stage, triode VT1 colelctor electrode connect simultaneously resistance R1 one end and auxiliary reclay KA coils one
End；
Resistance R1 other end connecting triode VT2 base stage, triode VT2 emitter stage connect voltage-regulator diode VS's simultaneously
One end of negative electrode and resistance R2, triode VT2 colelctor electrode connect one end and the diode VD2 of A.C. contactor KM coils simultaneously
Anode；
+ 6V dc sources connect the other end of auxiliary reclay KA coils, the other end of A.C. contactor KM coils, two poles simultaneously
The other end of pipe VD2 negative electrode, the resistance R2 other end and auxiliary reclay KA normally opened contacts.
2. ground fault detection device according to claim 1, it is characterised in that+6V dc sources are derived from circuit breaker Q S, handed over
Supply line between the stream normally opened main contacts of contactor KM, live wire L and zero line N connect the both ends of transformer T primary coils, transformation respectively
The both ends of device T secondary coils connect rectifier bridge UR two ac input ends respectively, and rectifier bridge UR cathode power supply output end output+
6V dc sources, rectifier bridge UR negative power supply output head grounding.
3. ground fault detection device according to claim 2, it is characterised in that rectifier bridge UR is using four diode structures
Into single phase bridge type rectifier circu.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721009627.9U CN207037001U (en) | 2017-08-11 | 2017-08-11 | Ground fault detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721009627.9U CN207037001U (en) | 2017-08-11 | 2017-08-11 | Ground fault detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207037001U true CN207037001U (en) | 2018-02-23 |
Family
ID=61487457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721009627.9U Active CN207037001U (en) | 2017-08-11 | 2017-08-11 | Ground fault detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207037001U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980782A (en) * | 2019-03-26 | 2019-07-05 | 深圳市赛飞奇光子技术有限公司 | A kind of the wireless monitor detector and system of electric line safe operation |
| CN110297151A (en) * | 2019-05-24 | 2019-10-01 | 温州华亚电气有限公司 | A kind of observation circuit protection circuit of ground fault earth leakage protective device operation troubles |
-
2017
- 2017-08-11 CN CN201721009627.9U patent/CN207037001U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980782A (en) * | 2019-03-26 | 2019-07-05 | 深圳市赛飞奇光子技术有限公司 | A kind of the wireless monitor detector and system of electric line safe operation |
| CN109980782B (en) * | 2019-03-26 | 2024-05-24 | 深圳市赛飞奇光子技术有限公司 | Wireless monitoring detector and system for safe operation of power transmission and distribution line |
| CN110297151A (en) * | 2019-05-24 | 2019-10-01 | 温州华亚电气有限公司 | A kind of observation circuit protection circuit of ground fault earth leakage protective device operation troubles |
| CN110297151B (en) * | 2019-05-24 | 2022-04-08 | 温州华亚电气有限公司 | Monitoring circuit protection circuit for operation fault of earth fault leakage protector |
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