CN218412850U - Flash grounding searching device based on direct-current square wave characteristic signal - Google Patents
Flash grounding searching device based on direct-current square wave characteristic signal Download PDFInfo
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- CN218412850U CN218412850U CN202221735615.5U CN202221735615U CN218412850U CN 218412850 U CN218412850 U CN 218412850U CN 202221735615 U CN202221735615 U CN 202221735615U CN 218412850 U CN218412850 U CN 218412850U
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract
The utility model discloses a device is seeked to flash nature ground connection based on direct current square wave characteristic signal, include: the signal source host computer, connect with direct current system feeder line branch road, pour into the characteristic signal of direct current square wave to it, including: a host CPU module; the signal generating module is respectively connected with the host CPU module and the direct current system feeder line branch circuit, is controlled by the host CPU module to generate a direct current square wave characteristic signal and transmits the direct current square wave characteristic signal to the direct current system feeder line branch circuit; the auxiliary engine is connected with balance bridge resistance earth connection, and when the nature ground fault that flashes takes place, direct current system feeder branch road and balance bridge resistance earth line formation ground return circuit makes the auxiliary engine survey direct current square wave characteristic signal, and the auxiliary engine includes: the signal processing module is connected with the resistance ground wire of the balance bridge and is used for processing the direct-current square wave characteristic signal; and the auxiliary machine CPU module is connected with the signal processing module and is used for carrying out waveform analysis on the direct current square wave characteristic signal and generating alarm information. The utility model has the advantages of the accurate seeking of flash nature ground connection.
Description
Technical Field
The utility model discloses flash nature troubleshooting field, concretely relates to flash nature ground connection seeking device based on direct current square wave characteristic signal.
Background
In a direct current power supply system, a permanent ground fault is a common fault, and the type of ground fault easily causes malfunction or failure of important protection equipment of a power grid, and even causes a short circuit if the fault is serious. While a flash ground fault is a very common fault, typically occurring in the presence of environmental moisture, rain, or insulation aging, etc., it is a short time from generation to termination relative to a permanent ground fault.
In the past, the relevant power professionals think that the duration of the flash ground fault is short and then does not affect the system, but otherwise, the flash ground fault may cause malfunction or failure of the protection equipment as long as the flash ground fault causes the voltage to ground of the direct current system to fluctuate, so that the voltage to ground reaches the action voltage of the relay and the duration is maintained until the action time of the relay.
Based on the problem, the utility model discloses an pour into direct current square wave characteristic signal into at direct current feeder branch road, provide a device is seeked to flash nature ground connection based on direct current square wave characteristic signal.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device is seeked to flashing nature ground connection based on direct current square wave characteristic signal solves the problem and the restriction that exist among the prior art.
In order to achieve the above object, the utility model provides a device is seeked to flashing nature ground connection based on direct current square wave characteristic signal, include: the signal source host is connected with the direct-current system feeder line branch and used for injecting direct-current square wave characteristic signals into the direct-current system feeder line branch; the signal source host comprises: a host CPU module; the signal generating module is respectively connected with the host CPU module and the direct current system feeder line branch, is controlled by the host CPU module to generate direct current square wave characteristic signals with different waveforms, and transmits the direct current square wave characteristic signals to the direct current system feeder line branch; the auxiliary machine is connected with the resistance grounding wire of the balance bridge, and when a flash ground fault occurs in the direct current system, a grounding loop is formed between the feeder line branch of the direct current system and the resistance grounding wire of the balance bridge, so that the auxiliary machine detects a direct current square wave characteristic signal; the auxiliary machine includes: the signal processing module is connected with the resistance ground wire of the balance bridge and is used for processing the detected direct-current square wave characteristic signal; and the auxiliary machine CPU module is connected with the signal processing module, and is used for carrying out waveform analysis on the direct current square wave characteristic signal and generating alarm information.
The signal source host machine also comprises a first pincerlike mutual inductor which is arranged between the signal generating module and the direct-current system feeder line branch, and the direct-current square wave characteristic signal generated by the signal generating module is induced to the direct-current system feeder line branch through the first pincerlike mutual inductor; the auxiliary machine further comprises a second pincerlike mutual inductor which is arranged between the signal processing module and the ground wire of the balance bridge resistor, and when a flash fault occurs, the direct-current square wave characteristic signal is transmitted to the signal processing module through the second pincerlike mutual inductor.
Further, the auxiliary machine further includes: the display module is connected with the auxiliary CPU module and used for receiving and displaying the waveform of the direct-current square wave characteristic signal transmitted by the auxiliary CPU module; the auxiliary machine indicator light module is connected with the auxiliary machine CPU module and used for receiving the alarm information transmitted by the auxiliary machine CPU module and lighting an alarm indicator light; and the auxiliary machine 4G communication module is connected with the auxiliary machine CPU module and is used for receiving the waveform of the direct current square wave characteristic signal and the alarm information transmitted by the auxiliary machine CPU module and transmitting the waveform and the alarm information to the signal source host.
Further, the signal source host further includes: the host 4G communication module is connected with the host CPU module and is used for receiving the waveform and the alarm information of the direct current square wave characteristic signal transmitted by the auxiliary machine 4G communication module and transmitting the waveform and the alarm information to the host CPU module; the WiFi module is connected with the host CPU module and used for receiving the alarm information transmitted by the host CPU module; and the host indicator light module is connected with the host CPU module and used for receiving the alarm information transmitted by the host CPU module and lightening the alarm indicator light.
The WiFi module is further connected with a computer and used for transmitting the alarm information to the computer, and the computer conducts alarm recording on the flash ground fault finding system.
Specifically, the auxiliary machine 4G communication module and the main machine 4G communication module realize transmission of waveforms of the direct current square wave characteristic signals and alarm information through a mobile network.
Furthermore, a host power supply module is further arranged in the signal source host, and is electrically connected with the host CPU module, the signal generation module, the WiFi module, the host indicator lamp module and the host 4G communication module, so that a power source is provided for normal operation of each module in the signal source host.
Furthermore, an auxiliary machine power supply module is further arranged in the auxiliary machine, and is electrically connected with the auxiliary machine CPU module, the signal processing module, the display module, the auxiliary machine indicator lamp module and the auxiliary machine 4G communication module, so that a power source is provided for normal operation of each module in the auxiliary machine.
Specifically, the signal generation module can output-1 mA direct current, and control and output various direct current square wave characteristic signals with different waveforms through various different on-off modes of the relay.
Specifically, a voltage-current conversion circuit is adopted for outputting a direct current of-1 mA, and the voltage-current conversion circuit outputs a current in a double-operational-amplifier load grounding mode.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses pour into the direct current square wave characteristic signal of eight passageways into at most at direct current feeder branch road, eight passageways correspond eight kinds of different direct current square wave characteristic signals, detect these eight kinds of direct current square wave characteristic signals in balance bridge resistance earth connection department, through every passageway direct current square wave characteristic signal waveform unique separately, distinguish which passageway corresponds which flash nature ground fault branch road for flash nature ground fault searching mode easy operation, and the fault signature is obvious.
2. The utility model discloses can indicate current operating condition through waveform display and pilot lamp, the inspection time that the maintainer of being convenient for was judged can be saved greatly to the analysis of maintainer, has ensured the continuity of system's power supply effectively, has extremely important meaning to security, continuity and the reliability of electric power system power supply.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the signal generation of the present invention;
fig. 3 is a schematic diagram of the positive polarity flash grounding search of the present invention;
fig. 4 is a schematic diagram of the negative pole flash grounding search of the present invention;
fig. 5 is a circuit diagram of the voltage-current conversion circuit of the present invention.
Detailed Description
The technical contents, structural features, attained objects and effects of the present invention will be described in detail below with reference to the accompanying drawings by preferred embodiments.
It should be noted that the drawings are simplified and have non-precise ratios, and are only used for convenience and clarity to assist in describing the embodiments of the present invention, and are not used for limiting the conditions of the present invention, so they have no technical essential meaning, and any structural modification, ratio relationship change or size adjustment should still fall within the scope covered by the present invention without affecting the function and the achievable purpose of the present invention.
It should be noted that, in the present invention, the relational terms such as first and second, and the like are used only for distinguishing one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
When a flash ground fault occurs in the direct current system, a ground loop is formed between the feeder line branch of the direct current system and the resistance ground wire of the balance bridge, and the direct current square wave characteristic signal can be detected in the loop. Based on the above principle, the utility model provides a device is seeked to flash nature ground based on direct current square wave characteristic signal, the ground connection is seeked the device and is included signal source host computer 1 and auxiliary engine 2 two parts, as shown in fig. 1, signal source host computer 1 and direct current system feeder branch road connection mainly include: the device comprises a host CPU module 12, a signal generation module 13, a WiFi module 14, a host indicator light module 15 and a host 4G communication module 16. The host CPU module 12 is a central control module of the signal source host 1 and is respectively connected with the signal generation module 13, the WiFi module 14, the host indicator light module 15 and the host 4G communication module 16; and the WiFi module 14 is further connected to a computer. Auxiliary engine 2 is connected with balance bridge resistance earth connection, mainly includes: the device comprises an auxiliary machine CPU module 22, a signal processing module 23, a display module 24, an auxiliary machine indicator lamp module 25 and an auxiliary machine 4G communication module 26. The auxiliary CPU module 22 is a central control module of the auxiliary 2, and is connected to the signal processing module 23, the display module 24, the auxiliary indicator light module 25, and the auxiliary 4G communication module 26 respectively.
Further, the signal source host 1 further includes a first pincerlike transformer, which is disposed between the signal generating module 13 and the dc system feeder line branch, and the dc square wave characteristic signal generated by the signal generating module 13 is induced to the dc system feeder line branch through the first pincerlike transformer.
Further, the auxiliary machine 2 further includes a second pincerlike transformer, which is disposed between the signal processing module 23 and the ground line of the balance bridge resistor, and when a flash fault occurs, the dc square wave characteristic signal is transmitted to the signal processing module 23 through the second pincerlike transformer.
Specifically, the host CPU module 12 sends a control instruction to control each channel of the signal generating module 13 to generate a dc square wave characteristic signal with different waveforms, and the dc square wave characteristic signal is transmitted to the first pincerlike transformer, and is induced to the feeder line branch of the dc system by the first pincerlike transformer.
When a flash ground fault occurs in the dc system, a ground loop is formed between the feeder line branch of the dc system and the resistance ground line of the balance bridge, and a dc square wave characteristic signal can be detected in the loop, so the auxiliary machine 2 can detect the dc square wave characteristic signal injected into the feeder line branch of the dc system at the resistance ground line of the balance bridge, the dc square wave characteristic signal is input into the signal processing module 23 through the second pincerlike transformer to be subjected to filtering processing, rectifying processing and amplifying processing, and then is transmitted to the auxiliary machine CPU module 22 to be subjected to waveform analysis of the dc square wave characteristic signal, and according to the waveform, it is determined which channel of the signal generating module 13 emits the dc square wave characteristic signal, and then it is determined which channel of the signal generating module 13 has the flash ground fault.
The auxiliary CPU module 22 transmits the relevant fault information to three modules, which are: the auxiliary CPU module 22 transmits the waveform of the DC square wave characteristic signal to the display module 24, and the display module 24 visually displays the waveform of the DC square wave characteristic signal; the auxiliary machine CPU module 22 transmits the alarm information to the auxiliary machine indicator lamp module 25, and the auxiliary machine indicator lamp module 25 lights up the alarm indicator lamp; the auxiliary CPU module 22 transmits the waveform of the dc square wave characteristic signal and the alarm information to the auxiliary 4G communication module 26, and transmits the waveform and the alarm information to the main 4G communication module 16 through the auxiliary 4G communication module 26.
The host 4G communication module 16 transmits the waveform of the received direct-current square wave characteristic signal and alarm information to the host CPU module 12, the host CPU module 12 sends out a control instruction after processing, the alarm information is transmitted to the WiFi module 14 and the host indicator lamp module 15 respectively, the host indicator lamp module 15 is triggered to light up an alarm indicator lamp, meanwhile, the WiFi module 14 further transmits the alarm information to a computer, and the computer performs corresponding alarm recording on the flash ground fault finding system so as to facilitate checking by a user.
Further, the signal source host 1 further includes a host power module 11, the host power module 11 is electrically connected to the host CPU module 12, the signal generation module 13, the WiFi module 14, the host indicator light module 15, and the host 4G communication module 16, and the host power module 11 provides a power source for normal operation of each module in the signal source host 1.
The auxiliary machine 2 further comprises an auxiliary machine power supply module 21, the auxiliary machine power supply module 21 is electrically connected with an auxiliary machine CPU module 22, a signal processing module 23, a display module 24, an auxiliary machine indicator lamp module 25 and an auxiliary machine 4G communication module 26, and the auxiliary machine power supply module 21 provides a power source for normal operation of each module in the auxiliary machine 2.
Preferably, the first pincer-like mutual inductor and the second pincer-like mutual inductor can be used for measuring the magnitude of current, and the current can be measured by magnetic induction without disconnecting the power supply.
Preferably, the signal generating module 13 can output a direct current of-1 mA to 1mA, and a plurality of different on-off modes are formed by the relay, so that a plurality of channels of the signal generating module 13 correspondingly output a plurality of direct current square wave characteristic signals with different waveforms. In this embodiment, eight different on-off modes can be formed through the relay to control and output eight different waveforms of the dc square wave characteristic signals, and the eight different waveforms of the dc square wave characteristic signals are respectively output from the eight channels corresponding to the signal generating module 13.
Specifically, as shown in fig. 2, when the relay K is closed, according to the magnetic induction rule, the closed loop forms a circuit with a current I, and the range of the current I is-1 mA to 1mA; when the relay K is open, the current I =0. Controlling a relay K to perform on-off actions according to the same rule in the same channel to form a direct-current square wave characteristic signal waveform with the same change rule, such as: when the relay K is changed according to the rule that 1s is opened and 1s is closed, the direct-current square wave characteristic signal can form a square wave waveform which is changed according to the rule of 1 s; and the relays K are respectively controlled to perform on-off actions according to different rules in the eight channels, so that direct current square wave characteristic signals with different waveforms are formed.
The process of searching for the flash ground fault is shown in fig. 3 and 4, a signal source main machine 1 injects a direct current square wave characteristic signal into a direct current feeder branch position (1), and an auxiliary machine 2 detects the direct current square wave characteristic signal injected into the position (1) at a balance bridge resistance ground wire position (3). In the process of searching for the flash ground fault, if the direct-current square wave characteristic signal is injected at the position (1) and can be detected at the position (3), the position of the injection point of the direct-current square wave characteristic signal is continuously moved towards the load direction until the direct-current square wave characteristic signal is moved to the position (2), the direct-current square wave characteristic signal of the channel is not detected at the position (3), and the auxiliary machine 2 can judge that the position is the flash ground fault point from the waveform display of the direct-current square wave characteristic signal to the waveform display of no square wave. And then the fault point is removed, and the whole flash ground fault finding process is finished.
When a positive pole flash resistive ground fault occurs in the dc system, please refer to fig. 3, after injecting the dc square wave characteristic signal into the position (1), the dc square wave characteristic signal passes through the power grid along the ground point R0 to the position (3) of the balance bridge resistance ground line, then passes through the balance bridge negative resistance R to the battery pack, and finally returns to the position (1), so as to form a ground loop, and the dc square wave characteristic signal can be detected in the ground loop.
When a negative pole flash resistive ground fault occurs in the dc system, please refer to fig. 4, which is the same as the above-mentioned searching process of the positive pole flash resistive ground fault, and the difference is the flow direction of the dc square wave characteristic signal. Specifically, a direct-current square wave characteristic signal is injected into a direct-current feeder branch position (1) by a signal source host 1, the direct-current square wave characteristic signal injected into the position (1) is detected at a grounding line position (3) of a balance bridge resistor by an auxiliary machine 2, after the direct-current square wave characteristic signal is injected into the position (1), the direct-current square wave characteristic signal flows to a storage battery, flows to the grounding line position (3) of the balance bridge resistor through a balance bridge anode resistor R, flows to a grounding point R0 through a power grid, and finally returns to the position (1), so that a grounding loop is formed, and the direct-current square wave characteristic signal can be detected in the grounding loop.
Further, a voltage-current conversion circuit is used for outputting a direct current of-1 mA to 1mA, and as shown in fig. 5, the voltage-current conversion circuit outputs a current in a double operational amplifier load grounding manner. Uin is a control voltage, a 16-bit serial D/A converter DAC7734 of T1 company is used for outputting the control voltage Uin, the DAC7734 adopts a reference voltage of 5V, wide-range bipolar output of-5V can be achieved, zero errors can be compensated through digital input, and therefore output errors cannot be caused. I0 is output current, RL is load; the input currents of the positive and negative input ends of the A1 and A2 operational amplifiers are 0, the levels are the same, wherein A2 is a voltage follower, the input current of the positive input end is 0, and the currents are all output to a load RL, so that U3= U0 is obtained; a1 is a proportional amplifying circuit, obtaining
If R1= R2= R3= R4, uin = U1-U0 is obtained,
the magnitude of the obtained output current I0 only depends on the control voltage Uin and the resistance Rs, and the constant current output can be realized regardless of the load RL. In the preferred embodiment, rs =5k Ω is adopted, and direct current of-1 mA can be output.
Compared with the prior art, the utility model provides a device is seeked to flash nature ground connection based on direct current square wave characteristic signal has the advantage that the accurate searching of flash nature ground connection, has not only improved the work efficiency that this type of ground fault found, also the effectual continuity that ensures the system power supply has extremely important meaning to security, continuity and the reliability of electric power system power supply.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (10)
1. A flashing grounding searching device based on a direct current square wave characteristic signal is characterized by comprising:
the signal source host is connected with the direct current system feeder line branch and used for injecting direct current square wave characteristic signals into the direct current system feeder line branch; the signal source host comprises: a host CPU module; the signal generating module is respectively connected with the host CPU module and the direct current system feeder line branch, is controlled by the host CPU module to generate direct current square wave characteristic signals with different waveforms, and transmits the direct current square wave characteristic signals to the direct current system feeder line branch;
the auxiliary machine is connected with the resistance ground wire of the balance bridge, and when a flash ground fault occurs in the direct current system, a ground loop is formed between the feeder line branch of the direct current system and the resistance ground wire of the balance bridge, so that the auxiliary machine detects a direct current square wave characteristic signal; the auxiliary machine includes: the signal processing module is connected with the resistance ground wire of the balance bridge and is used for processing the detected direct-current square wave characteristic signals; and the auxiliary machine CPU module is connected with the signal processing module, and is used for carrying out waveform analysis on the direct current square wave characteristic signal and generating alarm information.
2. The apparatus according to claim 1, wherein the signal source host further comprises a first pincerlike transformer disposed between the signal generating module and the dc system feeder line branch, and the dc square wave characteristic signal generated by the signal generating module is induced to the dc system feeder line branch through the first pincerlike transformer;
the auxiliary machine further comprises a second pincerlike mutual inductor which is arranged between the signal processing module and the ground wire of the balance bridge resistor, and when a flash fault occurs, the direct-current square wave characteristic signals are transmitted to the signal processing module through the second pincerlike mutual inductor.
3. The dc square wave signature signal based flash ground lookup device of claim 1, wherein the auxiliary machine further comprises:
the display module is connected with the auxiliary CPU module and used for receiving and displaying the waveform of the direct-current square wave characteristic signal transmitted by the auxiliary CPU module;
the auxiliary machine indicator lamp module is connected with the auxiliary machine CPU module and used for receiving the alarm information transmitted by the auxiliary machine CPU module and lighting an alarm indicator lamp;
and the auxiliary machine 4G communication module is connected with the auxiliary machine CPU module and is used for receiving the waveform of the direct current square wave characteristic signal and the alarm information transmitted by the auxiliary machine CPU module and transmitting the waveform and the alarm information to the signal source host.
4. The apparatus for dc square wave signature signal based flash ground searching, as claimed in claim 3, wherein said signal source host further comprises:
the host 4G communication module is connected with the host CPU module and is used for receiving the waveform and the alarm information of the direct-current square wave characteristic signal transmitted by the auxiliary machine 4G communication module and transmitting the waveform and the alarm information to the host CPU module;
the WiFi module is connected with the host CPU module and used for receiving the alarm information transmitted by the host CPU module;
and the host indicator light module is connected with the host CPU module and used for receiving the alarm information transmitted by the host CPU module and lighting an alarm indicator light.
5. The apparatus according to claim 4, wherein the WiFi module is further connected to a computer for transmitting alarm information to the computer, and the computer performs alarm recording on the system for flashing ground fault finding.
6. The device for flash ground searching based on the dc square wave characteristic signal according to claim 4, wherein the auxiliary 4G communication module and the main 4G communication module realize the transmission of the waveform of the dc square wave characteristic signal and the alarm information through a mobile network.
7. The apparatus according to claim 4, wherein the signal source host further comprises a host power module electrically connected to the host CPU module, the signal generating module, the WiFi module, the host indicator light module, and the host 4G communication module, for providing a power source for normal operation of each module of the signal source host.
8. The device for flash ground searching based on the dc square wave characteristic signal of claim 3, wherein an auxiliary power module is further disposed in the auxiliary machine, and is electrically connected to the auxiliary CPU module, the signal processing module, the display module, the auxiliary indicator light module, and the auxiliary 4G communication module, so as to provide a power source for normal operation of each module in the auxiliary machine.
9. The device for searching for the flicker ground based on the direct current square wave characteristic signal according to claim 1, wherein the signal generating module can output a direct current of-1 mA, and the direct current square wave characteristic signals with different waveforms can be controlled and output by a plurality of different on-off modes of the relay.
10. The apparatus according to claim 9, wherein the output of-1 mA to 1mA dc current is a voltage-current converter circuit, and the voltage-current converter circuit outputs current by a dual operational amplifier load grounding method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221735615.5U CN218412850U (en) | 2022-07-05 | 2022-07-05 | Flash grounding searching device based on direct-current square wave characteristic signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221735615.5U CN218412850U (en) | 2022-07-05 | 2022-07-05 | Flash grounding searching device based on direct-current square wave characteristic signal |
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| CN202221735615.5U Active CN218412850U (en) | 2022-07-05 | 2022-07-05 | Flash grounding searching device based on direct-current square wave characteristic signal |
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