CN107656167A - Singlephase earth fault alarm detecting device - Google Patents
Singlephase earth fault alarm detecting device Download PDFInfo
- Publication number
- CN107656167A CN107656167A CN201711049674.0A CN201711049674A CN107656167A CN 107656167 A CN107656167 A CN 107656167A CN 201711049674 A CN201711049674 A CN 201711049674A CN 107656167 A CN107656167 A CN 107656167A
- Authority
- CN
- China
- Prior art keywords
- module
- voltage
- input
- signal
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000008878 coupling Effects 0.000 claims abstract description 23
- 238000010168 coupling process Methods 0.000 claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 4
- 230000007935 neutral effect Effects 0.000 abstract description 14
- 238000000034 method Methods 0.000 description 12
- 230000005611 electricity Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of singlephase earth fault alarm detecting device, including voltage analysis module, photoelectric coupling module, timing module, alarm signal to occur module.Voltage analysis module includes voltage acquisition module, rectification module, filtration module, voltage comparison module.When the voltage signal that the input of voltage comparison module receives is more than the certain multiple of predeterminated voltage, the output end output high level signal of voltage comparison module.The output end of voltage comparison module is connected with the input of photoelectric coupling module, and the output end of photoelectric coupling module and the input of timing module connect, and the output end of timing module is connected with the input of alarm signal generation module.When singlephase earth fault occurs for the power switch cabinet of isolated neutral, if finding, certain phase phase voltage exceedes predeterminated voltage certain multiple and continued more than preset time, you can is determined as there is singlephase earth fault, alarm signal occurs module and sends fault alarm signal.
Description
Technical field
The present invention relates to the power switch cabinet technical field of isolated neutral, especially a kind of isolated neutral electric power
Singlephase earth fault alarm detecting device in switch cubicle.
Background technology
10kV power switch cabinets in China are by the way of isolated neutral at present, also known as small current neutral grounding system.Should
In various failures under mode, singlephase earth fault is the most common system failure, and non-faulting phase voltage can rise when failure occurs
For line voltage, system overvoltage is caused, easily causes insulation breakdown with this failure operation for a long time, produces arc short-circuit ground connection,
Two points ground fault failure is formed, has a strong impact on system safety.Small current neutral grounding system is caused when singlephase earth fault occurs
Steady-state component and transient state component is realize that fast and accurate to determine that faulty line work provides abundant, useful after failure
Information.It is different according to the type of fault-signal, mainly there is zero-sequence current to the detection method of low current neutral grounding system fault at present
Comparison method, Harmonic Method, zero sequence active component method, zero sequence admittance method etc..
Zero-sequence current comparison method is divided into than two kinds of width method and phase comparing method.Do not connect completely for transformer Y types winding and the earth
The system connect, when breaking down, the size of the zero-sequence current flowed into from top for the circuit that breaks down, which is more than, not to break down
Circuit size, and direction flows to bus from circuit, with the zero-sequence current direction of circuit do not broken down just not
Together.Therefore, according to otherness of the two class circuits in terms of size and Orientation, you can investigation accidents happened circuit.But such a method compared with
It is vulnerable to the influence in electric current relay secondary circuit out-of-balance current and relay work dead band, and circuit length, transition electricity
The size of resistance, system operation mode etc. can also interfere to judged result.
Harmonic Method passes through the frequency analysis to fault current using certainly existing harmonic components this features in fault current
Realize the judgement to failure.Arc suppression coil has different compensating actions to the harmonic wave of not homogeneous, for compensating weaker harmonic wave,
Carry out can be neglected the influence of arc suppression coil to it during than width and than phase so that the route selection based on harmonic wave is not by neutral grounding mode
Limitation.In Harmonic Method, the too big harmonic signal of overtone order should not be selected to be analyzed, quintuple harmonics it is most widely used
It is general.The advantages of the method is any type of neutral grounding mode to be all suitable for and principle is simple, but it also has than width
The inherent shortcoming of phase comparing method.Because the content of single harmonic component is smaller so that detection sensitivity is relatively low.
The content of the invention
The technical problem to be solved in the present invention is：A kind of singlephase earth fault alarm detecting device is provided, suitable for neutrality
The power switch cabinet of the earth-free mode of point, alarm is realized during singlephase earth fault.
The technical solution adopted for the present invention to solve the technical problems is：A kind of singlephase earth fault alarm detecting device,
Module occurs including voltage analysis module, photoelectric coupling module, timing module, alarm signal；
The voltage analysis module includes voltage acquisition module, rectification module, filtration module, voltage comparison module；
The voltage acquisition module is used to gather the voltage signal between A phases or B phases or C phases and earth terminal, the voltage
The output signal of acquisition module is successively after rectified module, filtration module to the input of voltage comparison module, when voltage ratio compared with
When the voltage signal that the input of module receives is more than the certain multiple of predeterminated voltage, the output end output of voltage comparison module is high
Level signal, otherwise the output end of voltage comparison module output low level signal；
The output end of voltage comparison module is connected with the input of photoelectric coupling module, the output end of photoelectric coupling module with
The input connection of timing module, the output end of timing module are connected with the input of alarm signal generation module；
The output end output high level letter of photoelectric coupling module during the output end output high level signal of voltage comparison module
Number, the input of timing module starts timing after receiving the high level signal of photoelectric coupling module output, and timing reaches default
Export enabling signal after time, alarm signal occur module input receive the enabling signal of timing module output after send
Fault alarm signal.
Further, the voltage acquisition module includes piezo-resistance R1, ground capacity C, current limliting module, the pressure-sensitive electricity
Resistance R1 one end is connected with A phases or B phases or C, the piezo-resistance R1 other ends ground connection, described current limliting module one end and A phases or B
Mutually or C is connected, and the current-limiting resistance other end is connected with ground capacity C ungrounded end, the earth terminal of the ground capacity C
Ground connection.
Further, the rectification module includes diode D1, diode D2, the positive pole of the diode D1, described two
Pole pipe D2 negative pole is connected with ground capacity C ungrounded end, the plus earth of the diode D2.
Further, the negative pole of the diode D1 and the input of voltage comparison module connect, the filtration module one
End is connected with the input of voltage comparison module, the other end ground connection of the filtration module.
Further, the current limliting module is current-limiting resistance.
Filtration module is conventional RC filter circuits, is composed in parallel by filter capacitor and load resistance.The photoelectric coupling
Module is conventional photoelectrical coupler, is made up of light emitting diode and phototriode.
The beneficial effects of the invention are as follows：When singlephase earth fault occurs for the power switch cabinet of isolated neutral, non-faulting
Phase voltage is changed into original 1.732 times, it is contemplated that situations such as actual partial earth, if finding, certain phase phase voltage exceedes default electricity
Pressure certain multiple simultaneously continues more than preset time, you can is determined as there is singlephase earth fault, module occurs for alarm signal
Input sends fault alarm signal after receiving the enabling signal of timing module output.The singlephase earth fault alarm of the present invention
Detection means is applied to the power switch cabinet of isolated neutral mode, and alarm is realized during singlephase earth fault.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is the principle schematic of the singlephase earth fault alarm detecting device of the present invention；
Fig. 2 is the principle schematic of voltage analysis module；
Fig. 3 is the principle schematic of photoelectric coupling module.
Embodiment
Presently in connection with accompanying drawing, the present invention is further illustrated.These accompanying drawings are simplified schematic diagram only with signal side
Formula illustrates the basic structure of the present invention, therefore it only shows the composition relevant with the present invention.
As shown in figure 1, a kind of singlephase earth fault alarm detecting device, including voltage analysis module, photoelectric coupling module,
Module occurs for timing module, alarm signal.
The voltage analysis module includes voltage acquisition module, rectification module, filtration module, voltage comparison module.
The voltage acquisition module is used to gather the voltage signal between A phases or B phases or C phases and earth terminal, the voltage
The output signal of acquisition module is successively after rectified module, filtration module to the input of voltage comparison module, when voltage ratio compared with
When the voltage signal that the input of module receives is more than the certain multiple of predeterminated voltage, 1.25 times of predeterminated voltage are greater than
When, the output end output high level signal of voltage comparison module, on the contrary the output end of voltage comparison module output low level signal.
The output end of voltage comparison module is connected with the input of photoelectric coupling module, the output end of photoelectric coupling module with
The input connection of timing module, the output end of timing module are connected with the input of alarm signal generation module.
The output end output high level letter of photoelectric coupling module during the output end output high level signal of voltage comparison module
Number, the input of timing module starts timing after receiving the high level signal of photoelectric coupling module output, and timing reaches default
Export enabling signal after time, alarm signal occur module input receive the enabling signal of timing module output after send
Fault alarm signal.The preset time of timing module is for example arranged to 120s.
Specifically, as shown in Fig. 2 the voltage acquisition module includes piezo-resistance R1, ground capacity C, current limliting module, institute
State piezo-resistance R1 one end with A phases or B phases or C to be connected, the piezo-resistance R1 other ends ground connection, described current limliting module one end
It is connected with A phases or B phases or C, the current-limiting resistance other end is connected with ground capacity C ungrounded end, the ground capacity C
Earth terminal ground connection.The current limliting module can use current-limiting resistance.
The rectification module includes diode D1, diode D2, the positive pole of the diode D1, the diode D2 it is negative
Extremely it is connected with ground capacity C ungrounded end, the plus earth of the diode D2.
The negative pole of the diode D1 and the input of voltage comparison module connect, described filtration module one end and voltage ratio
Input compared with module connects, the other end ground connection of the filtration module.Filtration module is conventional RC filter circuits, by filtering
Electric capacity composes in parallel with load resistance.
The continuous collecting to phase voltage is realized using voltage acquisition module, using rectification module so that output current is more steady
It is fixed, processing is filtered to voltage using filtration module.
As shown in figure 3, the photoelectric coupling module is conventional photoelectrical coupler, by light emitting diode and phototriode
Composition.Realize that coupling forms the conversion of electricity-light and light-electricity by light.Using photoelectric coupling module by timing module, alarm
Signal generating module is kept apart with high-pressure side.
When singlephase earth fault occurs for the power switch cabinet of isolated neutral, non-faulting phase voltage is changed into original
1.732 times, it is contemplated that situations such as actual partial earth, if finding, certain phase phase voltage exceedes predeterminated voltage certain multiple and continued
More than preset time, you can be determined as there is singlephase earth fault, the input that module occurs for alarm signal receives timing
Fault alarm signal is sent after the enabling signal of module output.
The voltage of non-faulting phase voltage change when the singlephase earth fault alarm detecting device of the present invention is according to single-phase earthing
Characteristic, real-time monitoring and alarm to singlephase earth fault are realized, bring very big facility to accident analysis and processing, carrying
There is larger use in terms of high failure efficiency and guarantee power supply reliability, be highly suitable for the electricity using isolated neutral mode
Power switch cubicle, in particular by the 10kV power switch cabinets of isolated neutral mode.
It is complete by above-mentioned description, relevant staff using the above-mentioned desirable embodiment according to the present invention as enlightenment
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to determines its technical scope according to right.
Claims (5)
- A kind of 1. singlephase earth fault alarm detecting device, it is characterised in that：Including voltage analysis module, photoelectric coupling module, Module occurs for timing module, alarm signal；The voltage analysis module includes voltage acquisition module, rectification module, filtration module, voltage comparison module；The voltage acquisition module is used to gather the voltage signal between A phases or B phases or C phases and earth terminal, the voltage acquisition The output signal of module works as voltage comparison module successively after rectified module, filtration module to the input of voltage comparison module Input receive voltage signal be more than predeterminated voltage certain multiple when, voltage comparison module output end output high level Signal, otherwise the output end of voltage comparison module output low level signal；The output end of voltage comparison module is connected with the input of photoelectric coupling module, the output end of photoelectric coupling module and timing The input connection of module, the output end of timing module are connected with the input of alarm signal generation module；The output end output high level signal of photoelectric coupling module, meter during the output end output high level signal of voltage comparison module When module input receive photoelectric coupling module output high level signal after start timing, after timing reaches preset time Export enabling signal, alarm signal occur module input receive timing module output enabling signal after send failure announcement Alert signal.
- 2. singlephase earth fault alarm detecting device according to claim 1, it is characterised in that：The voltage acquisition module Including piezo-resistance R1, ground capacity C, current limliting module, described piezo-resistance R1 one end is connected with A phases or B phases or C, described The piezo-resistance R1 other ends are grounded, and described current limliting module one end is connected with A phases or B phases or C, the current-limiting resistance other end and Ground capacity C ungrounded end connection, the earth terminal ground connection of the ground capacity C.
- 3. singlephase earth fault alarm detecting device according to claim 2, it is characterised in that：The rectification module includes Diode D1, diode D2, the positive pole of the diode D1, the negative pole of the diode D2 are ungrounded with ground capacity C End connection, the plus earth of the diode D2.
- 4. singlephase earth fault alarm detecting device according to claim 3, it is characterised in that：The diode D1's is negative The input of pole and voltage comparison module connects, and the input of described filtration module one end and voltage comparison module connects, described The other end ground connection of filtration module.
- 5. singlephase earth fault alarm detecting device according to claim 2, it is characterised in that：The current limliting module is limited Leakage resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711049674.0A CN107656167A (en) | 2017-10-31 | 2017-10-31 | Singlephase earth fault alarm detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711049674.0A CN107656167A (en) | 2017-10-31 | 2017-10-31 | Singlephase earth fault alarm detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107656167A true CN107656167A (en) | 2018-02-02 |
Family
ID=61096891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711049674.0A Pending CN107656167A (en) | 2017-10-31 | 2017-10-31 | Singlephase earth fault alarm detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107656167A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824380A (en) * | 2019-11-06 | 2020-02-21 | 科华恒盛股份有限公司 | Three-phase earth fault detection circuit and three-phase earth fault detection method |
| CN113176471A (en) * | 2021-04-07 | 2021-07-27 | 国网江苏省电力有限公司南通供电分公司 | Distribution lines fault detection system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203572909U (en) * | 2013-11-21 | 2014-04-30 | 国家电网公司 | Single-phase ground fault detection circuit and system |
| CN207268763U (en) * | 2017-10-31 | 2018-04-24 | 国网江苏省电力公司南通供电公司 | Singlephase earth fault alarm detecting device |
-
2017
- 2017-10-31 CN CN201711049674.0A patent/CN107656167A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203572909U (en) * | 2013-11-21 | 2014-04-30 | 国家电网公司 | Single-phase ground fault detection circuit and system |
| CN207268763U (en) * | 2017-10-31 | 2018-04-24 | 国网江苏省电力公司南通供电公司 | Singlephase earth fault alarm detecting device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824380A (en) * | 2019-11-06 | 2020-02-21 | 科华恒盛股份有限公司 | Three-phase earth fault detection circuit and three-phase earth fault detection method |
| CN113176471A (en) * | 2021-04-07 | 2021-07-27 | 国网江苏省电力有限公司南通供电分公司 | Distribution lines fault detection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101777755A (en) | High-voltage capacitor imbalance protecting method for high-voltage DC transmission system | |
| CA2946180A1 (en) | Relay protection method and apparatus against lc parallel circuit detuning faults | |
| CN104218523B (en) | detecting circuit for circuit breaker | |
| CN109782122A (en) | A kind of detection method of S Injection Signal | |
| CN101614777A (en) | A kind of output ground fault detection method and device that is used for UPS | |
| CN102385036B (en) | Method and circuit for detecting alternating-current fuse failure of uninterruptible power supply | |
| CN107656167A (en) | Singlephase earth fault alarm detecting device | |
| CN103414155A (en) | Neutral point installation electronic type rapid harmonic-vibration eliminating device | |
| CN216285498U (en) | Zero-crossing pulse counting phase-loss detection circuit | |
| CN207268763U (en) | Singlephase earth fault alarm detecting device | |
| CN203191498U (en) | Undercurrent grounding line selecting device | |
| CN108400005B (en) | Transformer direct-current magnetic bias suppression system and suppression method | |
| CN103777103B (en) | A kind of arc suppression coil state online test method and device | |
| CN203103948U (en) | Controller for arc extinction and over-voltage protection device | |
| CN205265227U (en) | Leakage protection circuit , earthleakage protective equipment and consumer | |
| CN2785226Y (en) | Long-distance short circuit protector | |
| CN107332219A (en) | A kind of harmonic elimination system for microcomputer | |
| CN103245872B (en) | AC fuse condition checkout gear | |
| CN2870251Y (en) | Single-phase earthing fault protection apparatus of neutral point non-earthing system | |
| CN102593813A (en) | Intelligent comprehensive resonance elimination device | |
| CN202282604U (en) | Induction motor phase failure fault on-line monitoring device | |
| CN2272161Y (en) | Remote interphase short-circuit protection | |
| CN204631177U (en) | A kind of single phase low voltage distribution system Fault Pre pick-up unit | |
| CN210838926U (en) | Alternating current intrusion and high voltage counterattack protection device for direct current system of transformer substation | |
| CN204441873U (en) | Zero passage starting resistor mutual-inductor resonance harmonic elimination circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180202 |