CN207352393U - A kind of fault detector - Google Patents
A kind of fault detector Download PDFInfo
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- CN207352393U CN207352393U CN201721027398.3U CN201721027398U CN207352393U CN 207352393 U CN207352393 U CN 207352393U CN 201721027398 U CN201721027398 U CN 201721027398U CN 207352393 U CN207352393 U CN 207352393U
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21014—Interface, module with relays
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21162—Detect short circuit of cable
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25174—Ethernet
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25197—Optical, glass fiber
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses a kind of fault detector, by being acquired to the temperature signal, earth-fault signal and short circuit fault signal of cable, and it is transmitted through the fiber to host and carries out signal analysis, when host judges that temperature signal exceedes preset value, when grounding phenomenon either occur or short circuit phenomenon occur, then connect connected local alarm and carry out alarm.It can be seen from the above that this fault detector can determine whether cable breaks down in time, staff can be by local alarm situation, definite line fault section, and find out trouble point rapidly.In addition, realizing the transmission of collection signal by optical fiber, Phototube Coupling is not only realized, efficiently solves Insulation Problems, and make it that signal energy loss in transmitting procedure is small, is not easy by external interference.Finally, the power supply to host is realized by dual power supply module in the utility model, improves redundancy so that power supply is relatively reliable.
Description
Technical field
Power electronics field is the utility model is related to, more particularly to a kind of fault detector.
Background technology
In looped network distribution system, particularly in the largely system using ring net load switch, if next stage distribution
There occurs when line short fault or earth fault in network system, the electric power system of upper level must before the deadline into
Row disjunction, to prevent major accident.After disjunction protection occurs, the system that can cause to be under the jurisdiction of this grade of network is all stopped
Electricity.Maintenance personal needs to quickly find the section to break down, and fault section is opened in disjunction, so as to recover fault-free section in time
Power supply.With this, you can save a large amount of times for searching faulty components, also reduce power off time and the scope having a power failure, to client and
Electric power system brings two-win effect.
In order to quickly determine fault section, in the prior art, by third generation fault detector to fault section into
Row determines.The fault detector mainly determines whether to break down by line voltage distribution, is specifically, is zero by line voltage distribution
As tripping have a power failure Main Basiss because line voltage distribution be zero be line tripping have a power failure sufficient and necessary condition.
But third generation fault detector can only indicate whether to break down and be prompted after breaking down, it is impossible to chase after
The time of failure generation is found with the failure logging occurred is repeated several times；And what is more important, can not be to the temperature of cable
Real time monitoring and record, occur overtemperature can not and alarm.
Utility model content
The purpose of this utility model is to provide a kind of fault detector, the temperature of cable can be monitored in real time and recorded,
And when detecting that cable breaks down, timely alarm.Resist in addition, realizing that there is the transmission for gathering signal by optical fiber
The advantages of strong is disturbed, and the reliability of fault detector is improved by dual power supply module for power supply.
In order to solve the above technical problems, the utility model provides a kind of fault detector, for the cable in power distribution network, bag
Include the host being arranged at ring main unit, be connected with the host, dual power supply module for power supply, be arranged at the cable
Thermometric at temperature sensor, with the cable connection, the grounding sensor of the ground signalling for gathering the cable, with
The cable connection, the short-circuit sensor of the short-circuit signal for gathering the cable；
The temperature sensor, the grounding sensor and the short-circuit sensor are connected by optical fiber with the host
Collection signal transmission to the host, the host to be connected with local alarm, and it is abnormal in the collection signal
When, connect the local alarm.
Preferably, further include the monitoring server being connected with the main-machine communication, the host by the collection signal with
And abnormal results is sent to the monitoring server.
Preferably, the local alarm is indicator light.
Preferably, the temperature sensor is specifically included for sense temperature signal, and the temperature signal is converted to
The temperature measurement module of electric signal, be connected with the temperature measurement module, for controlling the first lumination of light emitting diode according to the electric signal
Microcontroller；
Wherein, the optical fiber receives the optical signal of first light emitting diode, and is transmitted to the host.
Preferably, the temperature measurement module is 3.
Preferably, the short-circuit sensor is 3, is connected respectively with 3 phase lines of the cable, the grounding sensor
For 1, it is connected with 3 phase lines of the cable.
Preferably, the short-circuit sensor or the grounding sensor specifically include the Current Mutual Inductance with the cable connection
Device, is connected with the current transformer, and the signal for being exported according to the current transformer controls the second light emitting diode
Luminous signal processing circuit；
Wherein, the optical fiber receives the optical signal of second light emitting diode, and is transmitted to the host.
Preferably, the display being connected with the host is further included.
Preferably, the dual power supply module specifically includes the external power supply introduced by communication cable and energy storage electricity
Pond.
Preferably, the battery compartment for placing the energy-storage battery is further included.
Fault detector provided by the utility model, by the temperature signal of cable, earth-fault signal and short
Road fault-signal is acquired, and is transmitted through the fiber to host and is carried out signal analysis, when host judges that temperature signal exceedes
Preset value, when grounding phenomenon either occur or short circuit phenomenon occur, then connects connected local alarm and alarms
Prompting.It can be seen from the above that this fault detector can determine whether cable breaks down in time, staff can be by local report
Alert device situation, rapidly definite line fault section, and find out trouble point.In addition, the transmission of collection signal is realized by optical fiber, no
Phototube Coupling is only realized, efficiently solves Insulation Problems, and make it that signal energy loss in transmitting procedure is small, is not easy
By external interference.Finally, the power supply to host is realized by dual power supply module in the utility model, improves redundancy,
So that power supply is relatively reliable.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment, letter will be done to attached drawing needed in the embodiment below
Single introduction, it should be apparent that, drawings in the following description are only some embodiments of the utility model, general for this area
For logical technical staff, without creative efforts, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the power network line schematic diagram of power distribution network；
Fig. 2 is a kind of structure chart for fault detector that the utility model embodiment provides；
Fig. 3 is the structure chart for another fault detector that the utility model embodiment provides；
Fig. 4 (a) is a kind of circuit diagram for temperature measurement module that the utility model embodiment provides；
Fig. 4 (b) is a kind of microcontroller and its peripheral circuit being connected with temperature measurement module that the utility model embodiment provides
Circuit diagram；
Fig. 4 (c) is a kind of circuit for the first light emitting diode being connected with microcontroller that the utility model embodiment provides
Figure；
Fig. 4 (d) is a kind of reset circuit figure being connected with microcontroller that the utility model embodiment provides；
Fig. 4 (e) is that a kind of work being connected with microcontroller that the utility model embodiment provides enables circuit diagram；
Fig. 4 (f) is a kind of operating voltage detection circuit figure being connected with microcontroller that the utility model embodiment provides；
Fig. 5 is a kind of circuit diagram for short-circuit sensor that the utility model embodiment provides.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than all real
Apply example.Based on the embodiment in the utility model, those of ordinary skill in the art without making creative work, institute
The every other embodiment obtained, belongs to scope of protection of the utility model.
The core of the utility model is to provide a kind of fault detector, the temperature of cable can be monitored in real time and recorded,
And when detecting that cable breaks down, timely alarm.Resist in addition, realizing that there is the transmission for gathering signal by optical fiber
The advantages of strong is disturbed, and the reliability of fault detector is improved by dual power supply module for power supply.
In order to make those skilled in the art more fully understand the utility model, below in conjunction with the accompanying drawings and it is embodied
The utility model is described in further detail for mode.
Fig. 1 is the power network line schematic diagram of power distribution network.As shown in Figure 1, the power distribution network includes 11 ring main units, it is respectively 1-
No. 11, the fault detector 20 of an offer described in the utility model is respectively mounted at each ring main unit.If failure appears in 3 ring
Between net cabinet and No. 4 ring main units, at this time, the indicating fault 20 at No. 1 ring main unit, No. 2 ring main units and 3 ring net cabinet can be in
Alarm condition.In specific implementation, the on-load switch of 3 ring net cabinet can be disconnected, then close breaker A, then 1,2,3 ring net
Cabinet and its branch system restore electricity.And the power supply of 4, No. 5 cabinets, then realized by closing the opened point of No. 6 ring main units.This
What sample was isolated is only a segment fault cable, so as to ensure that all loads can restore electricity in time.
Fig. 2 is a kind of structure chart for fault detector that the utility model embodiment provides.As shown in Fig. 2, indicating fault
Device 20 is used for the cable in power distribution network, including is arranged at host 21 at ring main unit, is connected with host 21, for the double electric of power supply
Source power supply module 22, the temperature sensor 23 being arranged at the thermometric of cable and cable connection, the ground connection for gathering cable are believed
Number grounding sensor 24 and cable connection, the short-circuit sensor 25 of the short-circuit signal for gathering cable；
Temperature sensor 23, grounding sensor 24 and short-circuit sensor 25 are connected that will adopt by optical fiber 26 with host 21
Collect signal transmission to host 21, host 21 to be connected with local alarm 27, and when collection signal is abnormal, connect local report
Alert device 27.
In specific implementation, 23 moment of temperature sensor perceives cable surface temperature value, and passes through 26 timing transmission of optical fiber
To host 21.When temperature occurs abnormal, host 21 carries out fault alarm by relevant local alarm device 27.Grounding sensor
24 are used to detect the earth-fault current at connected cable, and short-circuit sensor 25 is used to detect at connected cable
Short-circuit current, and by the optical fiber 26 with being each connected will gather signal transmission to host 21.Host 21 passes through inside
The pulse width of CPU failure judgements waveform and down pulse (i.e. failure time delay), if collection signal has reached failure and set
The preset value put, host 21 can record dependent failure information, and carry out alarm by local alarm 27.
It is understood that local alarm 27 can be indicator light or buzzer etc..In addition, local alarm 27 can be with
Including 3 indicators, such as including 3 indicator lights, alarm in terms of instruction temperature signal is respectively used to, in terms of earth fault
Alarm and the alarm of short circuit aspect.In order to save energy consumption, indicator light can choose LED light.
In the present embodiment, the data transfer between host 21 and each sensor is communicated using optical fiber 26, and optical-fibre communications has
Advantages below：
1) electric property, high mechanical strength, leakproofness, corrosion resistance and good, ensure the finger of optical fiber under rugged environment
Mark does not decline, service life length；
2) optical fiber electromagnetism interference performance is excellent.Optical fiber is insulating material, so thunder and lightning interference, ionization from nature
The change of layer and the interference of Sunspot Activities, also from the dry of the industrial electrical equipments such as electric railway feed line and high-tension apparatus
Disturb；
3) fibre loss is low, long transmission distance.Fibre loss can be less than 0.2dB/km, this is than current any transmission medium
Loss is all low, in unrepeatered transmission distance up to tens, kilometer even up to a hundred；
4) signal cross-talk is small, security performance is good, and size is small, light-weight, easy to lay；
5) material source enriches, and environmental protection is good, is conducive to save non-ferrous metal copper；
6) it is radiationless, it is difficult to eavesdrop, because the light wave of optical fiber transmission cannot be run out of beyond optical fiber.
In order to allow those skilled in the art more to understand the concrete structure of host 21 provided by the utility model, hereinafter
Provide detailed description.It is understood that embodiment is one kind in numerous embodiments in detail below, do not represent
Host 21 only has a kind of this embodiment.
The design of host 21 uses multiple functional STM microcontrollers as data processing centre, in order to ensure in battery powered
When battery service life, microcontroller and peripheral components select low energy-consumption electronic device.
STM series is based on aiming at the ARM that requires the Embedded Application of high-performance, low cost, low-power consumption specially to design
Cortex-M3 kernels, are the highest products of performance in similar product, and basic model clock frequency is 36MHz.Brand-new STM interconnected types
(Connectivity) Series of MCU has full speed USB (OTG) interface, end product is being connected another USB device
When can not only serve as usb host but also may act as USB slaves, also support IEEE1588 Precision Time Protocol (PTP) Ethernet connect
Mouthful, with hardware realization, this agreement can reduce CPU overhead, improve the response speed of application and networked devices synchronous communication in real time.
In addition, being provided with external data storage, more information can be stored.
Fault detector provided in this embodiment, by the temperature signal of cable, earth-fault signal and short circuit event
Barrier signal is acquired, and is transmitted through the fiber to host and is carried out signal analysis, is judged that temperature signal exceedes when host and is preset
Value, when grounding phenomenon either occur or short circuit phenomenon occur, then connects connected local alarm and carries out alarm.
It can be seen from the above that this fault detector can determine whether cable breaks down in time, staff can be by local alarm
Situation, rapidly definite line fault section, and find out trouble point.In addition, the transmission of collection signal is realized by optical fiber, it is not only real
Phototube Coupling is showed, has efficiently solved Insulation Problems, and make it that signal energy loss in transmitting procedure is small, be not easy by outer
Disturb on boundary.Finally, the power supply to host is realized by dual power supply module in the utility model, improves redundancy so that
Power relatively reliable.
Fig. 3 is the structure chart for another fault detector that the utility model embodiment provides.As shown in figure 3, above-mentioned
On the basis of embodiment, preferably embodiment, further includes the monitoring server 30 communicated to connect with host 21, host 21
Collection signal and abnormal results are sent to monitoring server 30.
In specific implementation, host 21 is connected with monitoring server 30 especially by RS485 buses.Gather signal and exception
As a result monitoring server 30 can be sent in real time, and the region of guilty culprit and specific is shown on the screen of monitoring server 30
Position, guiding track walker determines rapidly fault section and finds out trouble point, to improving work efficiency, shortens power off time, fast
Quick-recovery is powered, and improves power supply reliability and economic benefit it is of great significance to.
On the basis of above-described embodiment, preferably embodiment, temperature sensor 23 are specifically included for perceiving
Temperature signal, and temperature signal is converted into the temperature measurement module of electric signal, is connected with temperature measurement module, for according to the electric signal
Control the microcontroller of the first lumination of light emitting diode.
Wherein, optical fiber 26 receives the optical signal of the first light emitting diode, and is transmitted to host 21.
Preferably, temperature measurement module is 3, is A phase temperature measurement modules respectively, for measuring the temperature of the A phase lines in cable
Signal, B phase temperature measurement modules, for measuring temperature signal, the C phase temperature measurement modules of the B phase lines in cable, for measuring in cable
C phase lines temperature signal.In the present embodiment, the temperature measurement module in temperature sensor 23 is arranged to 3 can prevent it
In a temperature measurement module failure, and cause wrong report phenomenon.Temperature transducer is close to cable when mounted, by temperature measurement module and connects
Connect on the connector of switch, prevent thermometric from by the pollution of environment temperature, humidity and dust being caused that true temperature problem cannot be reacted.
The automatic discrimination of temperature sensor 23 internal measurement exception is specially with processing：
Microcontroller can respectively obtain three temperature signals from three temperature measurement modules, and three temperature signals are dealt into master
Machine 21.After host 21 receives three temperature signals, the uniformity of three temperature signals is differentiated：
1) three temperature signals preserve in rational error range after three temperature signals are averaged；
If 2) in three temperature signals, there is a temperature signal to occur exceeding allowable error scope, host 21 will be overproof
Temperature signal reject, only by wherein two temperature signal it is average after be sent to monitoring server 30；Go out more than continuously three times
After this existing situation, host 21 reports 23 exception information of temperature sensor to monitoring server 30.It is also turned on indicating accordingly
Lamp, prompts related personnel to answer timely processing；
3) if three mutual errors of temperature signal exceed allowable error scope (such situation is more rare), host 21
Do not preserve the temperature signal this time measured (temperature signal is as abnormality processing)；After this situation is continuously appeared above three times,
Host reports abnormality of temperature sensors information to monitoring server, is also turned on corresponding indicator light, prompt related personnel should and
When handle；
Thermometric processing is carried out using three temperature measurement modules above, can differentiate the thermometric occurred due to temperature measurement module self reason
Abnormal phenomenon, effectively prevent the wrong report of thermometric exception.
In order to allow those skilled in the art more to understand the specific implementation side of temperature sensor provided by the utility model
Formula, is discussed in detail below.
Fig. 4 (a) is a kind of circuit diagram for temperature measurement module that the utility model embodiment provides.As shown in the figure, included in figure
3 temperature measurement modules, are respectively U10, U11 and U12, and temperature measurement module selects MCP9700.The voltage end Vc of each temperature measurement module is equal
It is connected with the P1.0 of microcontroller, output terminal is connected with the P1.1 ports, P1.2 ports and P1.3 ports of microcontroller respectively.Microcontroller
The temperature signal inputted by P1.1 ports, P1.2 ports and P1.3 ports judges whether to meet the requirements, and specific logic is referring to upper
Text description, this place repeats no more.Each temperature measurement module is also grounded by capacitance C20.
Fig. 4 (b) is a kind of microcontroller and its peripheral circuit being connected with temperature measurement module that the utility model embodiment provides
Circuit diagram.The inter-process chip U8 of microcontroller, selects MSP430 chips, power consumption itself is relatively low, in addition, electric in peripheral circuit
Appearance C18 is patch capacitor, and C17 is patch tantalum capacitance, and capacitance is 10 μ F, the two uses low energy consumption operation mode, effectively drops
Low power consumption.Microcontroller is directly powered by battery BAT2.
Fig. 4 (c) is a kind of circuit for the first light emitting diode being connected with microcontroller that the utility model embodiment provides
Figure.As shown in the figure, the first Light-emitting diode LED 8 is controlled by microcontroller, microcontroller is according to coding rule and control strategy, control
First Light-emitting diode LED 8 shines, and the optical signal that the first Light-emitting diode LED 8 is sent is transferred to host 21 by optical fiber 26,
Realize communication function.Resistance R37 is metering function.
Fig. 4 (d) is a kind of reset circuit figure being connected with microcontroller that the utility model embodiment provides.Reset circuit
In, the common port of resistance R36 and capacitance C19 are connected as reset terminal with microcontroller.
Fig. 4 (e) is that a kind of work being connected with microcontroller that the utility model embodiment provides enables circuit diagram.Work makes
In energy circuit, the P1.5 ports connection of the common port and microcontroller of resistance R38 and wire jumper J1.When wire jumper J1 is disconnected, microcontroller
P1.5 Port detectings enter holding state to high level, microcontroller；When wire jumper J1 is closed, the P1.5 Port detectings of microcontroller
To low level, microcontroller enters working status.Above-mentioned working method can make temperature sensor when warehouse is when inoperative place
Do not enter working status, so as to effectively reduce the power consumption of product.
Fig. 4 (f) is a kind of operating voltage detection circuit figure being connected with microcontroller that the utility model embodiment provides.Work
Make in voltage detecting circuit, the P1.7 ports connection of the common port and microcontroller of resistance R34 and resistance R35, resistance R35's is another
End is connected with the P1.6 ports of microcontroller.When detecting operating voltage, the P1.6 ports output low level of microcontroller, P1.7 ports
Detect operating voltage value.When not detecting operating voltage, the P1.6 ports output high level of microcontroller, so as to effectively reduce work(
Consumption.
Wherein, Fig. 4 (a)-Fig. 4 (f) forms complete temperature sensor.Three temperature measurement modules use interval work, measure
Temperature signal in normal range (NR), monitor and record temperature change using the thermometric mode of a constant cycle；When measuring
When temperature rise is larger, microcontroller accelerates detection frequency, and the system of ensure that can accurately observe the change of cable temperature, at the same time
Significantly reduce the power consumption of product.
Temperature sensor 23 is preserved the temperature measured every time, before a temperature uploads point arrival, by this cycle
The temperature inside measured is averaged, and is then communicated by optical fiber 26, this temperature value is uploaded to host 21, and since temperature passes
Sensor 23 has 3 temperature measurement modules, and therefore, host 21 can be obtained by the temperature signal that 3 temperature measurement modules obtain, so as to carry out
Judgement described above, details are not described herein again.
On the basis of above-described embodiment, preferably embodiment, short-circuit sensor 25 is 3, respectively with cable
3 phase lines connection, grounding sensor 24 be 1, be connected with 3 phase lines of cable.
In the present embodiment, short-circuit sensor 25 has 3, is respectively that A phases short-circuit sensor, B phases short-circuit sensor and C phases are short
Road sensor, the structure of three is all identical.Each short-circuit sensor 25 mutually whether there is short circuit phenomenon for detecting this.Connect
The structure of ground sensor 24 is identical with short-circuit sensor 25, is due to when singlephase earth fault occurs in cable why for 1
When, when causing the three-phase current vector summation to be not zero, therefore, the effect of grounding sensor 24 is exactly that to detect three-phase current vector total
Whether it is zero, if be not zero, by electric signal transmission to host 21.For short-circuit sensor 25, grounding sensor 24, remove
Outside internal battery, electric energy can also be obtained from short circuit current flow, short circuit current flow, there is provided give sensor power supply to use, improve sensing
Device service life.
Fig. 5 is a kind of circuit diagram for short-circuit sensor that the utility model embodiment provides.Preferably embodiment,
Short-circuit sensor 25 specifically includes the current transformer K1 with cable connection, is connected with current transformer, for according to electric current
The signal of mutual inductor K1 outputs controls the signal processing circuit of the second lumination of light emitting diode D2.Wherein, optical fiber 26 receives second
The optical signal of light emitting diode D2, and it is transmitted to host 21.
Since grounding sensor 24 is identical with 25 structure of short-circuit sensor, only the connection mode of current transformer K1 is not
Together, and different from the turn ratio to the induced power of current transformer K1, therefore, the utility model repeats no more.
As shown in figure 5, signal processing circuit specifically includes first resistor R1, second resistance R2,3rd resistor R3, the 4th electricity
Hinder R4, the 5th resistance R5, the 6th resistance R6, adjustable potentiometer R7, the 8th resistance R8, two-way killer tube D1, full-bridge rectifier D3,
Voltage detector U1, PNP type triode Q1.
Wherein, current transformer K1 is in parallel with two-way killer tube D1, first resistor R1 and full-bridge rectifier D3 successively.Entirely
The anode ground connection of the output terminal of bridge rectifier D3, the cathode of the output terminal of full-bridge rectifier D3 respectively with second resistance R2 first
The first end connection at end, the first end of 3rd resistor R3, the emitter of PNP type triode Q1 and the 6th resistance R6.3rd electricity
Resistance R3 second end be connected with the first fixing end of adjustable potentiometer R7 and the first end of the 4th resistance R4, adjustable potentiometer R7 with
Second fixing end is connected with the first end of the 8th resistance R8, the second end ground connection of the 8th resistance R8, the second end of second resistance R2
It is connected with the cathode of the second light emitting diode D2, the anode of the second light emitting diode D2 connects with the output terminal of voltage detector U1
Connect, the input terminal of voltage detector U1 is connected with the sliding end of adjustable potentiometer R7.The anode of second light emitting diode D2 also with
The first end connection of 5th resistance R5, the second end of the 5th resistance R5 and the second end and PNP type triode Q1 of the 6th resistance R6
Base stage connection, the collector of PNP type triode Q1 is connected with the second end of the 4th resistance R4.
Short-circuit sensor 25 and grounding sensor 24 have identical operation principle, using highly sensitive Current Mutual Inductance sense
Current signal should be gone out, and voltage signal is converted to by first resistor R1.When electric current exceedes set point, voltage detector U1 inspections
After survey voltage transfinites, low level is exported, and lights the second light emitting diode D2, the second light emitting diode D2 by optical fiber 26, will
Fault-signal is transferred to host 21.
In specific implementation, alarm current during short trouble can be set, it is possible to understand that ground is alarm current, delay
Time, can need to adjust when dispatching from the factory according to client.
A) action current scope is 400A to 1600A, continuously adjustable, factory default 630A in factory；
B) it is delayed：40~300ms is adjustable in factory, factory default 40ms；
C) precision：＜ ± 10% (in operating temperature range).
When this product designs, in short trouble context of detection, Microcomputer Protection principle is introduced into the designing technique of this product,
I.e. using the method for detection electric current ratio-change If/I0 (ratio of fault current and load current) mutation value, and combined circuit is jumped
Lock has a power failure to detect short trouble.This ratio-change mutation value, according to the curved line arithmetic built in fault detector and according to load
The size automatic dynamic of electric current is adjusted, and overcomes the defects of current break value static state that " current break method " uses immobilizes.
Therefore this product is from line construction, management mode, geographical environment, the influence of even time of running, from root
The existing mistake of fault detector currently on the market based on " overcurrent method or " and " current break method " design principle is overcome in sheet
Alarm or fail to report the defects of alert, therefore short trouble detection is accurately and reliably.
For the fault detector using the design of current break method, this fault detector has a power failure line tripping
Basis for estimation, which have also been made, thoroughly to be improved, and is zero Main Basiss having a power failure as tripping using line voltage distribution, because line voltage distribution is
Zero is the sufficient and necessary condition that line tripping has a power failure, this is relative to the another of the fault detector using the design of current break method
A significant design break-through point.
In terms of Neutral point nonearthing system phase-to-ground fault detection, this fault detector employs transient mutation
Method.
Mainly using line-to-ground fault each signal frequency component (300Hz of moment circuit transient occurs for this method
The signal component of~4000Hz) root-mean-square value undergos mutation this feature, the mutation increment of the root-mean-square value of these signals is detected,
And the Main Basiss using the phenomenon that this mutation increment combined circuit voltage (voltage-to-ground) declines as detection earth fault.
Because the Sudden Changing Rate of moment is grounded, from each high-frequency interferencing signal existing for circuit and circuit excitation surge current shadow
Ring, be easy to reliably detect, therefore use this method to overcome the earth fault using transient size as criterion currently on the market
The limitation of detection method, also overcomes the inaccuracy of first half-wave method, strong antijamming capability, fault detect is accurately and reliably.This
The brand-new fault detection technique that fault detector uses, is at present using the fault detector technology of current break method design
There is qualitative leap.
This fault detector can adjust fault eigenvalue according to various actual track automatic dynamics, from line construction, fortune
Row way to manage, geographical environment, load change, the influence of the time of running, it is applied widely, really meet the need of different user
Will, and be easy to mass produce.
In specific implementation, alarm current during earth fault can be set, it is possible to understand that ground is alarm current, delay
Time, can need to adjust when dispatching from the factory according to client.
A) alarm current：Action current scope 5A~100A, it is continuously adjustable in factory；Factory-default is 20A；
B) it is delayed：40~300ms is adjustable in factory, factory default 150ms；
C) precision：＜ ± 10% (in operating temperature range).
The electric current (zero-sequence current) of grounding sensor 24 is realized using the method for detection three-phase current summation.In normal condition
Its lower value should be zero, and fault current detection point range is that zero-sequence current is 5A~100A, and electric current is smaller, it is desirable to grounding sensor
24 have very high sensitivity.
In order to ensure good high_voltage isolation effect, the communication between grounding sensor 24 and host, by optical fiber 26 into
Row data transfer, battery can not be set inside grounding sensor 24, normal work power supply relies on the sensing of grounding sensor 24
Signal takes electricity to propose very high requirement the work of grounding sensor 24 come what is ensured.
The requirement of grounding sensor 24 detects 5A electric currents, and the electric current of short-circuit sensor 25 reaches 400~1600A, minimum
Current value differs 80 times, and quite high requirement is proposed to the Current Mutual Inductance part of grounding sensor 24.
Flow point requirement, which is crossed, according to grounding sensor 24 produces 10V, the voltage of 15mA in K1 level of current transformer；
It is required that current transformer K1 outputs are 10V*15mA=0.15W.
According to actual conditions, for the ease of installation, the magnet ring internal diameter that grounding sensor 24 senses and short-circuit sensor 25 big 2
More than times, the magnet ring effective length designed at present is 450mm, and the magnet ring effective length of short-circuit sensor 25 is 215mm.
The magnetic circuit of grounding sensor 24 is made of two parts at present, and 165mm magnetic circuits use silicon steel band, also has 50mm to use
High-carbon round steel forms axis class shape, and for induction coil on axis class high-carbon round steel, the connection of two kinds of materials uses riveting with crimping
Processing, reduce flux loss to the greatest extent, although have passed through a variety of considerations, flux loss can't neglect, produce magnetic loss it is main because
Element：
A) connection of two kinds of materials generates leakage field using riveting；
B) connection of two kinds of materials is using crimping, and contact area is smaller；
C) induction region uses axis class high-carbon round steel, and magnetic induction can produce larger vortex, cause magnetic loss.
For these problems, this product design uses effective magnet ring length as 450mm multi-disc silicon steel bands, has following excellent
Point：
A) single permeability magnetic material is used, avoids the junction loss between different materials；
B) induction coil is directly installed on direct-coupling in a region of silicon steel band, and magnetic induction is more efficient；
C) single silicon steel band is used, is handled in closed loop junction using the crimping of large area, magnetic flux closed loop effect is more preferable；
D) using multi-disc silicon steel band composition closed loop, compensate for effective magnet ring length it is long and caused by dispersion loss；
E) since primary current is small (minimum value 5A), in order to obtain the power of bigger, induction coil using more around
The number of turn processed, to obtain corresponding power.
After being handled more than, the induced voltage in grounding sensor 24 has reached design requirement.
On the basis of above-described embodiment, the display 28 being connected with host 21 is further included.
As shown in figure 3, being provided with display 28 on host 21, and button is correspondingly set on host 21, host 21
To abnormal results and sampled signal can be inquired about by the button on host 21 from display 28, it is preferable that display
28 be liquid crystal display, low in energy consumption using dedicated LCD drive chip, and display is clear.Therefore, line maintenance personnel are according to finger
Show the flicker of lamp, determine there are failure, then by the button on host 21, fault message is observed from display 28, can be with
Judge fault section rapidly.
Specifically, the panel of host 21 is equipped with 3 buttons, it is " movement ", " setting ", " confirmation " key respectively.Use panel
Upper button, it is possible to achieve historical information inquire about, such as can with the enquiry of historical data date, the historical data of each phase cable temperature,
Same day maximum temperature, mean temperature, environment mean temperature etc.；Can also be by button, to cable alarm temperature value, threephase cable
Temperature imbalance value, ambient temperature value alarm, the machine address, real-time time are configured；In addition, produce alarm after, ground connection, A phases,
B phases, C phase currents directly indicate that remaining can check specific fault message by liquid crystal after transfiniting in panel leds.Therefore
Barrier information includes：Battery undervoltage alarm, the uneven alarm of liquidus temperature overload alarm, liquidus temperature, environment temperature overload alarm
Deng.
On the basis of above-described embodiment, dual power supply module 22 specifically includes the external electrical introduced by communication cable
Source and energy-storage battery.
In specific implementation, host 21 uses dual power supply, internal standby lithium pond (one kind of energy-storage battery China)
With the external power supply introduced by communication cable, when no external power supply introduces, host 21 automatically switches to internal standby electricity
Source powers.
21 external power supply 9--24Vdc of host, static power：<200 milliwatts, maximum peak power：<400 milliwatts；When powering on
Operating current is not more than 15mA (12VDC), and peak-peak operating current is not more than 30mA (12VDC)；Host 21 is in no external electrical
Under the power supply state of source, powered using internal standby lithium pond, quiescent dissipation is not more than 10uA (when LED light is not bright).It is preferred that
Ground, using large capacity, the ER14250 high-capacity lithium ion battery thionyl chloride battery lithium batteries of low self-discharge, ensure that product uses the longevity
Life.
This product uses large capacity, the ER14250 high-capacity lithium ion batteries thionyl chloride battery lithium electricity of low self-discharge in design
Pond, mainly with following advantages：
Cell voltage 3.6V, battery rated capacity 1200mAH, battery size diameter 14mm length 25mm, can not fill once
Property lithium battery, lithium battery shelf life be 10 years；
The voltage of lithium-manganese dioxide battery is up to more than 3V, is twice of common batteries, this just anticipates for electrical appliance
Taste, which, can save power source space and mitigation weight；
Excellent discharge performance：Even across long-term electric discharge, it still keeps stable operating voltage, this is dramatically improved
The reliability of electrical appliance reaches using electric appliance the degree of non-maintaining (need not replace battery substantially)；
Superior temperature characterisitic, the application of the organic electrolyte solution high-quality, electric conductivity is good, enables battery -20
DEG C~60 DEG C of temperature ranges in normally work, by special process and formula, can also meet -40~80 DEG C of operating temperature
It is required that；
Good leak resistance, reliable sealing structure and the good electro-hydraulic and positive and negative electrode active material of use, make battery
With good leak resistance；
The working characteristics of long-life forms a protection film layer due to the effect of organic matter and lithium on the surface of cathode of lithium,
This is that lithium battery can keep the constant basic reason of its performance for a long time, along with accurate, reliable cell sealing-structure and
The use of high stability active material, enables the drop rate of holding in year of self-discharge of battery to control in the level less than 2%.
On the basis of above-described embodiment, the battery compartment for placing energy-storage battery is further included.
In the present embodiment, by setting battery compartment for energy-storage battery, so that when energy-storage battery breaks down, it is more convenient
Replacement.
Fault detector provided by the utility model is described in detail above.Each embodiment is adopted in specification
Described with progressive mode, what each embodiment stressed is the difference with other embodiment, each embodiment it
Between identical similar portion mutually referring to.For device disclosed in embodiment, due to its with embodiment disclosed in method
Corresponding, so description is fairly simple, reference may be made to the description of the method.It should be pointed out that led for this technology
For the those of ordinary skill in domain, on the premise of the utility model principle is not departed from, if can also be carried out to the utility model
Dry to improve and modify, these are improved and modification is also fallen into the protection domain of the utility model claims.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there are other identical element in the process, method, article or apparatus that includes the element.
Claims (10)
- A kind of 1. fault detector, for the cable in power distribution network, it is characterised in that including be arranged at host at ring main unit, Be connected with the host, dual power supply module for power supply, the temperature sensor being arranged at the thermometric of the cable, with The cable connection, the grounding sensor of the ground signalling for gathering the cable and the cable connection, for gathering State the short-circuit sensor of the short-circuit signal of cable；The temperature sensor, the grounding sensor and the short-circuit sensor are connected by optical fiber with the host to incite somebody to action Gather signal transmission to the host, the host to be connected with local alarm, and when the collection signal is abnormal, connect The logical local alarm.
- 2. fault detector according to claim 1, it is characterised in that further include the monitoring being connected with the main-machine communication Server, the host send the collection signal and abnormal results to the monitoring server.
- 3. fault detector according to claim 1, it is characterised in that the local alarm is indicator light.
- 4. fault detector according to claim 2, it is characterised in that the temperature sensor is specifically included for perceiving Temperature signal, and the temperature signal is converted into the temperature measurement module of electric signal, is connected with the temperature measurement module, for according to institute State the microcontroller that electric signal controls the first lumination of light emitting diode；Wherein, the optical fiber receives the optical signal of first light emitting diode, and is transmitted to the host.
- 5. fault detector according to claim 4, it is characterised in that the temperature measurement module is 3.
- 6. fault detector according to claim 2, it is characterised in that the short-circuit sensor be 3, respectively with it is described 3 phase lines connection of cable, the grounding sensor is 1, is connected with 3 phase lines of the cable.
- 7. fault detector according to claim 6, it is characterised in that the short-circuit sensor or the grounding sensor The current transformer with the cable connection is specifically included, is connected with the current transformer, for mutual according to the electric current The signal of sensor output controls the signal processing circuit of the second lumination of light emitting diode；Wherein, the optical fiber receives the optical signal of second light emitting diode, and is transmitted to the host.
- 8. according to the fault detector described in claim 1-7 any one, it is characterised in that further include and be connected with the host Display.
- 9. according to the fault detector described in claim 1-7 any one, it is characterised in that the dual power supply module tool Body includes the external power supply and energy-storage battery introduced by communication cable.
- 10. fault detector according to claim 9, it is characterised in that further include for placing the energy-storage battery Battery compartment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721027398.3U CN207352393U (en) | 2017-08-16 | 2017-08-16 | A kind of fault detector |
| CN201710702132.2A CN107272525B (en) | 2017-08-16 | 2017-08-16 | A kind of fault detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721027398.3U CN207352393U (en) | 2017-08-16 | 2017-08-16 | A kind of fault detector |
| CN201710702132.2A CN107272525B (en) | 2017-08-16 | 2017-08-16 | A kind of fault detector |
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| Publication Number | Publication Date |
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| CN207352393U true CN207352393U (en) | 2018-05-11 |
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| CN201721027398.3U Expired - Fee Related CN207352393U (en) | 2017-08-16 | 2017-08-16 | A kind of fault detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272525B (en) * | 2017-08-16 | 2019-10-18 | 浙江大有实业有限公司 | A kind of fault detector |
| CN110398615A (en) * | 2019-08-02 | 2019-11-01 | 浙江帕博电力科技有限公司 | A kind of temperature measuring type fault detector with coiling function |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976602A (en) * | 2017-11-14 | 2018-05-01 | 长园深瑞继保自动化有限公司 | High-tension cable metal outer jacket grounding circulation on-line monitoring system |
| CN108362970A (en) * | 2018-01-31 | 2018-08-03 | 苏州市普金电力成套设备有限公司 | A kind of high efficiency smart fault detect transmitting device |
| CN109298362B (en) * | 2018-09-10 | 2020-10-16 | 国网江苏省电力有限公司电力科学研究院 | Three-phase synchronization precision testing method, device and system for distribution line fault indicator |
| CN109358267A (en) * | 2018-10-09 | 2019-02-19 | 国网湖南省电力有限公司 | A kind of distribution line power failure monitoring method based on fault detector |
| CN111510495A (en) * | 2020-04-16 | 2020-08-07 | 吴斌 | Power grid fault point position information recording device |
| CN117007905B (en) * | 2023-07-05 | 2024-07-16 | 安徽中邦特种电缆科技有限公司 | Fault position indicating device for cable |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267922A (en) * | 2013-05-15 | 2013-08-28 | 国家电网公司 | Intelligent cable short circuit grounding and temperature fault indicator |
| CN103884961A (en) * | 2014-03-12 | 2014-06-25 | 珠海创能科世摩电气科技有限公司 | Cable fault on-line monitoring system |
| CN203870190U (en) * | 2014-04-30 | 2014-10-08 | 杭州欣美成套电器制造有限公司 | Fiber-style grounding and short-circuit fault indicator |
| CN205353270U (en) * | 2016-01-29 | 2016-06-29 | 珠海创能科世摩电气科技有限公司 | Intelligent cable fault indicator |
| CN205720525U (en) * | 2016-05-30 | 2016-11-23 | 珠海优特电力科技股份有限公司 | Cable line fault indicates device |
| CN107272525B (en) * | 2017-08-16 | 2019-10-18 | 浙江大有实业有限公司 | A kind of fault detector |
-
2017
- 2017-08-16 CN CN201710702132.2A patent/CN107272525B/en active Active
- 2017-08-16 CN CN201721027398.3U patent/CN207352393U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272525B (en) * | 2017-08-16 | 2019-10-18 | 浙江大有实业有限公司 | A kind of fault detector |
| CN110398615A (en) * | 2019-08-02 | 2019-11-01 | 浙江帕博电力科技有限公司 | A kind of temperature measuring type fault detector with coiling function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107272525A (en) | 2017-10-20 |
| CN107272525B (en) | 2019-10-18 |
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