CN109030953A - A kind of busbar grounding detection protection circuit - Google Patents
A kind of busbar grounding detection protection circuit Download PDFInfo
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- CN109030953A CN109030953A CN201810997356.5A CN201810997356A CN109030953A CN 109030953 A CN109030953 A CN 109030953A CN 201810997356 A CN201810997356 A CN 201810997356A CN 109030953 A CN109030953 A CN 109030953A
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- 238000001514 detection method Methods 0.000 title claims description 22
- 230000007935 neutral effect Effects 0.000 claims abstract description 10
- 230000011664 signaling Effects 0.000 claims description 7
- 230000035945 sensitivity Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention provides a kind of busbar groundings to detect protection circuit, simple circuit, structure is simple, is not influenced by ground capacity size, and signal response is fast, high reliablity.Including three phase mains interface, fairing, equalizing resistance group, rectifier bridge, capacitance group, failure warning output device；The three phase mains interface connects fairing, and the both ends of the fairing respectively connect an equalizing resistance group, and the other end of two equalizing resistance groups is connected by connecting line, and the neutral point of connecting line connects rectifier bridge；The failure warning output device includes optocoupler output interface, and the both ends of the rectifier bridge connect optocoupler output interface, and the optocoupler output interface is in parallel with capacitance group, and the optocoupler output interface is used for output ground fault signal.
Description
Technical field
The invention belongs to technical field of electric power detection, detect protection circuit more particularly, to a kind of busbar grounding.
Background technique
In mesolow three-phase power supply system, bus has hair in rainy season in summer or operating condition poor occasion single-end earthed
It is raw, it will cause the deviation of mains neutral point in this way, certain two-phase voltage increases, laod unbalance, and then keeps Electric Power Equipment Insulation damaged,
Even puncture, causes immeasurable loss.
Existing busbar grounding detection needs dedicated instrument and meter or artificial point inspection bus resistance over the ground, in this way at
This height, it is time-consuming and laborious.
Summary of the invention
In view of this, the present invention is directed to propose circuit is protected in a kind of busbar grounding detection, to solve existing three phase mains
Busbar grounding detection, the case where time-consuming and laborious, higher cost.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of busbar grounding detection protection circuit, including three phase mains interface, fairing, equalizing resistance group, rectifier bridge,
Capacitance group, failure warning output device；
The three phase mains interface connects fairing, and the both ends of the fairing respectively connect an equalizing resistance group,
The other end of two equalizing resistance groups is connected by connecting line, and the neutral point of connecting line connects rectifier bridge；
The failure warning output device includes optocoupler output interface, and the both ends connection optocoupler output of the rectifier bridge connects
Mouthful, the optocoupler output interface is in parallel with capacitance group, and the optocoupler output interface is used for output ground fault signal.
Further, the fairing is three-phase rectification bridge.
Further, each equalizing resistance group includes six concatenated resistance.
It further, further include busbar voltage acquisition interface, one end of the busbar voltage acquisition interface is connected to wherein
On the connecting line of two resistance in centre of one divider resistance group, the other end is connected to the centre two of another divider resistance group
On the connecting line of resistance, busbar voltage is acquired by the busbar voltage acquisition interface.
Further, the rectifier bridge is single-phase rectification bridge, including two groups of diode groups in parallel, each diode group packet
Two diodes are included, the neutral point of the connecting line connects between wherein two diodes of one group of diode group, another group
Ground signalling interface is connected between two diodes of diode group, the ground signalling interface is for exporting busbar grounding letter
Breath.
Further, the failure warning output device further includes warning lamp, and the warning lamp connects with optocoupler output
Mouth series connection.
Further, the warning lamp is LED light source.
Further, optocoupler output interface variable resistance also in parallel adjusts optocoupler output by the variable resistance
The sensitivity of interface.
Compared with the existing technology, busbar grounding detection protection circuit of the present invention has the advantage that
The simple circuit of busbar grounding detection protection circuit of the present invention, structure is simple, not by ground capacity size
Influence, signal response is fast, high reliablity；In addition, this circuit mould can be used in parallel in multiple positions of bus, in time ring
Fairing should be protected.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the circuit diagram of the detection protection circuit of busbar grounding described in the embodiment of the present invention；
Fig. 2 is the detection protection circuit diagram of busbar grounding described in the embodiment of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of busbar grounding detection protection circuit, including three phase mains interface, fairing, equalizing resistance group, rectifier bridge,
Capacitance group, failure warning output device；The three phase mains interface connects fairing, and the both ends of the fairing respectively connect
The other end of one equalizing resistance group, two equalizing resistance groups is connected by connecting line, and the neutral point of connecting line connects rectifier bridge；
The failure warning output device includes optocoupler output interface, and the both ends connection optocoupler output of the rectifier bridge connects
Mouthful, the optocoupler output interface is in parallel with capacitance group, and the optocoupler output interface is used for output ground fault signal.Other equipment
According to the fault message received, circuit is handled in time.
The fairing is three-phase rectification bridge.Each equalizing resistance group includes six concatenated resistance.Entire electricity
Road further includes busbar voltage acquisition interface, and one end of the busbar voltage acquisition interface is connected to one of divider resistance group
On the connecting line of intermediate two resistance, the other end is connected on the connecting line of two resistance in centre of another divider resistance group,
Busbar voltage is acquired by the busbar voltage acquisition interface.
The rectifier bridge is single-phase rectification bridge, and including two groups of diode groups in parallel, each diode group includes two two
The neutral point of pole pipe, the connecting line connects between wherein two diodes of one group of diode group, another group of diode group
Two diodes between connect ground signalling interface, the ground signalling interface is for exporting busbar grounding information.
The failure warning output device further includes warning lamp, and the warning lamp is connected with the optocoupler output interface.Institute
Stating warning lamp is LED light source.
Optocoupler output interface variable resistance also in parallel, adjusts the sensitive of optocoupler output interface by the variable resistance
Degree.
As shown in Figure 1, busbar grounding detection protection circuit, including fairing, ground signalling interface J2, busbar voltage are adopted
The composition such as sample interface J1 and optocoupler output interface J3.Three phase mains system system by fairing export bus signal, by R1~
The midpoint of R6, R7~R12 two groups of equalizing resistance groups of composition, R6 and R12 are neutral point.When bus is no ground, due to neutrality
Have no voltage difference between point and ground, so the rectifier bridge being made of D7~D10 is without output voltage, i.e. capacitance group C1, the both ends C2 without
Pressure drop, the optocoupler U1 of optocoupler output interface is without output；When bus occurs single-end earthed, occur pressure difference between neutral point and ground,
Warning lamp LED1 is bright, and optocoupler U1 exports fault-signal.In addition optocoupler U1 variable resistance RW also in parallel, by adjusting variable resistance RW
The size of resistance value, the sensitivity of adjustable optocoupler output.
As shown in Fig. 2, the working principle of this circuit uses balanced bridge detection method, preset 2 groups of resistances inside circuit module
It is worth identical divider resistance R1 over the ground, R2.By measuring Bus Voltage V1, V2.
When system is no ground, work as RX=RYWhen=∞, V1=V2 at this time.
When system single-end earthed when, it is assumed that cathode ground connection, then RY=0, then equation is set up:
V1/(R1∥RX)=V2/R2
Resistance R single-end earthed can be obtained in this wayX, resistance R single-end earthed can be solved using same methodY。
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of busbar grounding detection protection circuit, it is characterised in that: including three phase mains interface, fairing, equalizing resistance
Group, rectifier bridge, capacitance group, failure warning output device；
The three phase mains interface connects fairing, and the both ends of the fairing respectively connect an equalizing resistance group, and two
The other end of equalizing resistance group is connected by connecting line, and the neutral point of connecting line connects rectifier bridge；
The failure warning output device includes optocoupler output interface, and the both ends of the rectifier bridge connect optocoupler output interface, institute
It is in parallel with capacitance group to state optocoupler output interface, the optocoupler output interface is used for output ground fault signal.
2. busbar grounding detection protection circuit according to claim 1, it is characterised in that: the fairing is that three-phase is whole
Flow bridge.
3. busbar grounding detection protection circuit according to claim 1, it is characterised in that: each equalizing resistance group packet
Include six concatenated resistance.
4. busbar grounding detection protection circuit according to claim 3, it is characterised in that: further include that busbar voltage acquisition connects
Mouthful, one end of the busbar voltage acquisition interface is connected to the connecting line of two resistance in centre of one of divider resistance group
On, the other end is connected on the connecting line of two resistance in centre of another divider resistance group, is acquired by the busbar voltage
Interface acquires busbar voltage.
5. busbar grounding detection protection circuit according to claim 1, it is characterised in that: the rectifier bridge is single-phase rectifier
Bridge, including two groups of diode groups in parallel, each diode group includes two diodes, and the neutral point of the connecting line connects it
In one group of diode group two diodes between, between two diodes of another group of diode group connect ground signalling connect
Mouthful, the ground signalling interface is for exporting busbar grounding information.
6. busbar grounding detection protection circuit according to claim 1, it is characterised in that: the failure warning output device
It further include warning lamp, the warning lamp is connected with the optocoupler output interface.
7. busbar grounding detection protection circuit according to claim 6, it is characterised in that: the warning lamp is LED light source.
8. busbar grounding detection protection circuit according to claim 1, it is characterised in that: the optocoupler output interface is also simultaneously
Join variable resistance, the sensitivity of optocoupler output interface is adjusted by the variable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810997356.5A CN109030953A (en) | 2018-08-29 | 2018-08-29 | A kind of busbar grounding detection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810997356.5A CN109030953A (en) | 2018-08-29 | 2018-08-29 | A kind of busbar grounding detection protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109030953A true CN109030953A (en) | 2018-12-18 |
Family
ID=64625336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810997356.5A Pending CN109030953A (en) | 2018-08-29 | 2018-08-29 | A kind of busbar grounding detection protection circuit |
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Citations (10)
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|---|---|---|---|---|
| CN102279340A (en) * | 2011-07-20 | 2011-12-14 | 珠海泰坦新能源系统有限公司 | Direct-grounding insulation fault detection device and method |
| CN202166682U (en) * | 2011-07-20 | 2012-03-14 | 珠海泰坦新能源系统有限公司 | Fault detecting device of direct grounding |
| CN103701092A (en) * | 2013-12-18 | 2014-04-02 | 北京恺思维特科技有限责任公司 | Insulation resistance detection and ground protection device of DC electric system |
| CN204086448U (en) * | 2014-10-11 | 2015-01-07 | 北京易艾斯德科技有限公司 | A kind of insulation monitoring and warning device |
| CN204243725U (en) * | 2014-12-01 | 2015-04-01 | 新誉集团有限公司 | A kind of phase shortage monitoring and protecting circuit |
| CN104638635A (en) * | 2013-11-08 | 2015-05-20 | 中国石油化工股份有限公司 | Power grid neutral point active resistor grounding method |
| CN106093739A (en) * | 2016-08-23 | 2016-11-09 | 山东泰开自动化有限公司 | A kind of charging pile insulation monitoring and warning device of special bridge method design |
| CN106353646A (en) * | 2016-08-18 | 2017-01-25 | 联方云天科技(北京)有限公司 | Insulation detection and control method based on high-voltage DC power supply system |
| CN206161766U (en) * | 2016-10-31 | 2017-05-10 | 上海长江斯迈普电梯有限公司 | Elevator safety circuit earthing short circuit detection alarm circuit |
| CN208937646U (en) * | 2018-08-29 | 2019-06-04 | 天津市海诺电子有限公司 | A kind of novel bus ground protection circuit |
-
2018
- 2018-08-29 CN CN201810997356.5A patent/CN109030953A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279340A (en) * | 2011-07-20 | 2011-12-14 | 珠海泰坦新能源系统有限公司 | Direct-grounding insulation fault detection device and method |
| CN202166682U (en) * | 2011-07-20 | 2012-03-14 | 珠海泰坦新能源系统有限公司 | Fault detecting device of direct grounding |
| CN104638635A (en) * | 2013-11-08 | 2015-05-20 | 中国石油化工股份有限公司 | Power grid neutral point active resistor grounding method |
| CN103701092A (en) * | 2013-12-18 | 2014-04-02 | 北京恺思维特科技有限责任公司 | Insulation resistance detection and ground protection device of DC electric system |
| CN204086448U (en) * | 2014-10-11 | 2015-01-07 | 北京易艾斯德科技有限公司 | A kind of insulation monitoring and warning device |
| CN204243725U (en) * | 2014-12-01 | 2015-04-01 | 新誉集团有限公司 | A kind of phase shortage monitoring and protecting circuit |
| CN106353646A (en) * | 2016-08-18 | 2017-01-25 | 联方云天科技(北京)有限公司 | Insulation detection and control method based on high-voltage DC power supply system |
| CN106093739A (en) * | 2016-08-23 | 2016-11-09 | 山东泰开自动化有限公司 | A kind of charging pile insulation monitoring and warning device of special bridge method design |
| CN206161766U (en) * | 2016-10-31 | 2017-05-10 | 上海长江斯迈普电梯有限公司 | Elevator safety circuit earthing short circuit detection alarm circuit |
| CN208937646U (en) * | 2018-08-29 | 2019-06-04 | 天津市海诺电子有限公司 | A kind of novel bus ground protection circuit |
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Application publication date: 20181218 |