CN207268763U - Singlephase earth fault alarm detecting device - Google Patents
Singlephase earth fault alarm detecting device Download PDFInfo
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- CN207268763U CN207268763U CN201721425185.6U CN201721425185U CN207268763U CN 207268763 U CN207268763 U CN 207268763U CN 201721425185 U CN201721425185 U CN 201721425185U CN 207268763 U CN207268763 U CN 207268763U
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Abstract
A kind of singlephase earth fault alarm detecting device is the utility model is related to, including module occurs for voltage analysis module, photoelectric coupling module, timing module, alarm signal.Voltage analysis module includes voltage acquisition module, rectification module, filter module, voltage comparison module.When the voltage signal that the input terminal of voltage comparison module receives is more than the certain multiple of predeterminated voltage, the output terminal output high level signal of voltage comparison module.The output terminal of voltage comparison module is connected with the input terminal of photoelectric coupling module, and the output terminal of photoelectric coupling module and the input terminal of timing module connect, and the output terminal of timing module is connected with the input terminal 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 continues 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
It the utility model is related to the power switch cabinet technical field of isolated neutral, especially a kind of isolated neutral
Singlephase earth fault alarm detecting device in power switch cabinet.
Background technology
10kV power switch cabinets in China are also known as small current neutral grounding system by the way of isolated neutral at present.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, seriously affects 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 of the slave beginning inflow for the circuit that breaks down, which is more than, not to break down
Circuit size, and direction flows to busbar 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 judging 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 the harmonic wave of not homogeneous different compensating actions, for compensating weaker harmonic wave,
It is carried out than width and than the influence of arc suppression coil can be neglected during phase so that based on the route selection of harmonic wave from neutral grounding mode
Limitation.In Harmonic Method, the harmonic signal that overtone order should not be selected too big is 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.Since the content of single harmonic component is smaller so that detection sensitivity is relatively low.
Utility model content
The technical problems to be solved in the utility model is：A kind of singlephase earth fault alarm detecting device is provided, is suitable for
The power switch cabinet of isolated neutral mode, alarm is realized during singlephase earth fault.
Technical solution is used by the utility model solves its technical problem：A kind of singlephase earth fault alarm detection dress
Put, including module occurs for voltage analysis module, photoelectric coupling module, timing module, alarm signal；
The voltage analysis module includes voltage acquisition module, rectification module, filter 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 ground terminal, the voltage
The output signal of acquisition module is successively after rectified module, filter module to the input terminal of voltage comparison module, when voltage compares
When the voltage signal that the input terminal of module receives is more than the certain multiple of predeterminated voltage, the output terminal output of voltage comparison module is high
Level signal, otherwise the output terminal of voltage comparison module output low level signal；
The output terminal of voltage comparison module is connected with the input terminal of photoelectric coupling module, the output terminal of photoelectric coupling module with
The input terminal connection of timing module, the output terminal of timing module are connected with the input terminal of alarm signal generation module；
The output terminal output high level letter of photoelectric coupling module during the output terminal output high level signal of voltage comparison module
Number, the input terminal 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 terminal receive the enabling signal of timing module output after send
Fault alarm signal.
Further, the voltage acquisition module includes varistor 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 varistor 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 the ungrounded end of ground capacity C, the ground terminal of the ground capacity C
Ground connection.
Further, the rectification module includes diode D1, diode D2, the cathode of the diode D1, described two
The anode of pole pipe D2 is connected with the ungrounded end of ground capacity C, the plus earth of the diode D2.
Further, the anode of the diode D1 and the input terminal of voltage comparison module connect, the filter module one
End is connected with the input terminal of voltage comparison module, the other end ground connection of the filter module.
Further, the current limliting module is current-limiting resistance.
Filter 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 of light emitting diode and phototriode.
The beneficial effects of the utility model are：It is non-when singlephase earth fault occurs for the power switch cabinet of isolated neutral
Faulted phase voltage is changed into original 1.732 times, it is contemplated that situations such as actual partial earth, if it is pre- to find that certain phase phase voltage exceedes
If voltage certain multiple simultaneously continues more than preset time, you can is determined as there is singlephase earth fault, mould occurs for alarm signal
The input terminal of block sends fault alarm signal after receiving the enabling signal of timing module output.The single-phase earthing of the utility model
Fault warning detection device is suitable for the power switch cabinet of isolated neutral mode, and alarm is realized during singlephase earth fault.
Brief description of the drawings
The utility model is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the principle schematic of the singlephase earth fault alarm detecting device of the utility model；
Fig. 2 is the principle schematic of voltage analysis module；
Fig. 3 is the principle schematic of photoelectric coupling module.
Embodiment
The utility model is further described presently in connection with attached drawing.These attached drawings are simplified schematic diagram only to show
Meaning mode illustrates the basic structure of the utility model, therefore it only shows the composition related with the utility model.
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, filter 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 ground terminal, the voltage
The output signal of acquisition module is successively after rectified module, filter module to the input terminal of voltage comparison module, when voltage compares
When the voltage signal that the input terminal of module receives is more than the certain multiple of predeterminated voltage, 1.25 times of predeterminated voltage are greater than
When, the output terminal output high level signal of voltage comparison module, on the contrary the output terminal of voltage comparison module output low level signal.
The output terminal of voltage comparison module is connected with the input terminal of photoelectric coupling module, the output terminal of photoelectric coupling module with
The input terminal connection of timing module, the output terminal of timing module are connected with the input terminal of alarm signal generation module.
The output terminal output high level letter of photoelectric coupling module during the output terminal output high level signal of voltage comparison module
Number, the input terminal 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 terminal 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 varistor R1, ground capacity C, current limliting module, institute
State varistor R1 one end with A phases or B phases or C to be connected, the varistor 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 the ungrounded end of ground capacity C, the ground capacity C
Ground terminal ground connection.The current limliting module can use current-limiting resistance.
The rectification module includes diode D1, diode D2, the cathode of the diode D1, the diode D2 it is negative
Extremely it is connected with the ungrounded end of ground capacity C, the plus earth of the diode D2.
The anode of the diode D1 and the input terminal of voltage comparison module connect, described filter module one end and voltage ratio
Input terminal compared with module connects, the other end ground connection of the filter module.Filter module is conventional RC filter circuits, by filtering
Capacitance is composed 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 filter 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 continues
More than preset time, you can be determined as there is singlephase earth fault, the input terminal that module occurs for alarm signal receives timing
Fault alarm signal is sent after the enabling signal of module output.
Non-faulting phase voltage change when the singlephase earth fault alarm detecting device of the utility model is according to single-phase earthing
Voltage characteristic, realizes the real time monitoring to singlephase earth fault and alarm, and very big facility is brought to accident analysis and processing,
There is larger use in terms of improving failure efficiency and ensureing power supply reliability, be highly suitable for using isolated neutral mode
Power switch cabinet, in particular by the 10kV power switch cabinets of isolated neutral mode.
Using the above-mentioned desirable embodiment according to the utility model as enlightenment, pass through above-mentioned description, related work people
Member can carry out various changes and amendments in the range of without departing from this item utility model technological thought completely.This item is real
The content being not limited to new technical scope on specification, it is necessary to which its technology is determined according to right
Property scope.
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, filter 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 ground terminal, the voltage acquisition The output signal of module works as voltage comparison module successively after rectified module, filter module to the input terminal of voltage comparison module Input terminal receive voltage signal be more than predeterminated voltage certain multiple when, voltage comparison module output terminal output high level Signal, otherwise the output terminal of voltage comparison module output low level signal；The output terminal of voltage comparison module is connected with the input terminal of photoelectric coupling module, the output terminal of photoelectric coupling module and timing The input terminal connection of module, the output terminal of timing module are connected with the input terminal of alarm signal generation module；The output terminal output high level signal of photoelectric coupling module, meter during the output terminal output high level signal of voltage comparison module When module input terminal receive photoelectric coupling module output high level signal after start timing, after timing reaches preset time Export enabling signal, alarm signal occur module input terminal 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 varistor R1, ground capacity C, current limliting module, described varistor R1 one end is connected with A phases or B phases or C, described The varistor 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 The ungrounded end connection of ground capacity C, the ground 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 cathode of the diode D1, the anode 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 terminal of pole and voltage comparison module connects, and the input terminal of described filter module one end and voltage comparison module connects, described The other end ground connection of filter 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 |
|---|---|---|---|
| CN201721425185.6U CN207268763U (en) | 2017-10-31 | 2017-10-31 | Singlephase earth fault alarm detecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721425185.6U CN207268763U (en) | 2017-10-31 | 2017-10-31 | Singlephase earth fault alarm detecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656167A (en) * | 2017-10-31 | 2018-02-02 | 国网江苏省电力公司南通供电公司 | Singlephase earth fault alarm detecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656167A (en) * | 2017-10-31 | 2018-02-02 | 国网江苏省电力公司南通供电公司 | Singlephase earth fault alarm detecting device |
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