CN209148801U - Grounded screen monitoring unit and grounded screen monitoring system - Google Patents
Grounded screen monitoring unit and grounded screen monitoring system Download PDFInfo
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- CN209148801U CN209148801U CN201821636580.3U CN201821636580U CN209148801U CN 209148801 U CN209148801 U CN 209148801U CN 201821636580 U CN201821636580 U CN 201821636580U CN 209148801 U CN209148801 U CN 209148801U
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Abstract
Disclose a kind of grounded screen monitoring unit and grounded screen monitoring system.The equivalent impedance that the utility model embodiment passes through detection grounded screen; and automatically control the equivalent impedance of drop resistance module reduction grounded screen; overcurrent protection is carried out simultaneously; thus can be much sooner to the processing of grounded screen; the fast quick-recovery of grounded screen is used, while reducing personal damage or economic loss.
Description
Technical field
The utility model relates to Lightning Prevention Technique fields, and in particular to a kind of grounded screen monitoring unit and grounded screen monitoring
System.
Background technique
Lightning Disaster once caused many economic losses and casualties as one of major casualty.With electronic information
The development of technology, electronic equipment and electric appliance have been more and more widely used.Thunder and lightning can result in surge (that is, surging), damage
The bad electrical equipment etc. being connected in power grid.Surge is above the transient overvoltage of normal working voltage, usually occurs over just
The violent pulse of microsecond.Therefore the importance of the Lightning Protection becomes increasingly conspicuous.
The lightning current that thunder and lightning generates can be released in grounded screen.The equivalent impedance very little of grounded screen, usual 110 kilovolts of electricity
The equivalent impedance for the grounded screen arbitrarily downgraded is only 0.5 ohm, but with the increase of use time, and grounded screen contacts for a long time with soil
And wrapped up by soil, equivalent impedance can gradually increase.After grounded screen deteriorates, generalling use artificial mode reduces ground connection
The equivalent impedance of net be easy to cause personal damage or economic loss.
Utility model content
In view of this, the utility model proposes a kind of grounded screen monitoring unit and grounded screen monitoring system, it can be more fast
The equivalent impedance for reducing grounded screen fastly enables grounded screen to more quickly restore use, reduces personal damage or economic loss.
According to the utility model embodiment in a first aspect, providing a kind of grounded screen monitoring unit, comprising:
Grounded screen；
Resistance meter is connect with the grounded screen, is configured as detecting the equivalent impedance of the grounded screen；
Drop resistance module, is configured as reducing the equivalent impedance of the grounded screen；
Wireless communication module is configured as wirelessly sending impedance detection signal and receives control signal；
Earth leakage protective device is configured as carrying out overcurrent protection to the grounded screen monitoring unit；
Wherein, the drop resistance module includes friction reducer, is configured to respond to the control signal, discharges the drop resistance
Agent.
Preferably, the grounded screen monitoring unit further include:
Downlead is configured as lightning current introducing grounded screen and release；
Current sensor is connected between the grounded screen and the downlead, is configured as detection and is flowed through the ground connection
The electric current of net.
Preferably, the resistance meter is connect with the wireless communication module, and is sent to the wireless communication module
The impedance detection signal.
Preferably, the current sensor is configured as flowing through the electric current of the grounded screen every cycle detection.
Preferably, the wireless communication module is configured as wirelessly sending current detection signal.
Preferably, the current detection signal includes:
The peak signal of the electric current；And
The time span signal of the electric current.
Preferably, the wireless communication module is configured as storing the electric current inspection of predetermined quantity in a non-volatile manner
Survey the data of signal.
Preferably, the wireless communication module is configured as wirelessly receiving and sends command signal.
According to the second aspect of the utility model embodiment, a kind of grounded screen monitoring system is provided, comprising:
At least one grounded screen monitoring unit as described in any one of first aspect；And
At least one server.
Preferably, the server is configured to receive and store the impedance detection that the wireless communication module is sent
Signal and the current detection signal；And
The control signal and/or described instruction signal are sent to the wireless communication module.
The utility model embodiment automatically controls drop resistance module reduction grounded screen by detecting the equivalent impedance of grounded screen
Equivalent impedance, while overcurrent protection is carried out, to grounded screen can be enabled quick much sooner the processing of grounded screen
Restore to use, while reducing personal damage or economic loss.
Detailed description of the invention
By referring to the drawings to the description of the utility model embodiment, the above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the schematic diagram of the grounded screen monitoring unit of the utility model embodiment；
Fig. 2 is the circuit diagram of the earth leakage protective device of the utility model embodiment.
Specific embodiment
The utility model is described below based on embodiment, but the utility model is not restricted to these implementations
Example.It is detailed to describe some specific detail sections below in the datail description of the utility model.To those skilled in the art
The utility model can also be understood completely in the description of part without these details for member.In order to avoid obscuring the utility model
Essence, there is no narrations in detail for well known method, process, process, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through electrically by least one element or sub-circuit
The galvanic circle that connection or electromagnetism connect and compose.When title element or the " connection of another element of circuit " being connected to " or element/circuit
" between two nodes when, it, which can be, is directly coupled or connected another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, when claiming element " being directly coupled to " or " directly connecting
Be connected to " another element when, it is meant that the two be not present intermediary element.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it should be understood that term " first ", " second " etc. are used for description purposes only,
It is not understood to indicate or imply relative importance.In addition, in the description of the present invention, unless otherwise indicated, it is " more
It is a " it is meant that two or more.
Fig. 1 is the schematic diagram of the grounded screen monitoring unit of the utility model embodiment.As shown in Figure 1, the present embodiment connects
Ground resistance monitoring unit includes grounded screen 11, resistance meter 12, drop resistance module 13, wireless communication module 14 and earth leakage protective device
15.Wherein, resistance meter 12 is connect with grounded screen 11, is configured as the equivalent impedance of detection grounded screen 11.Drop resistance module 13
It is configured as reducing the equivalent impedance of grounded screen 11.Specifically, drop resistance module 13 includes friction reducer.Wireless communication module 14 is matched
It is set to and is coupled in a non-contact manner with corresponding server (not marked in figure), to wirelessly send impedance detection
Signal, specifically, impedance detection signal are used to characterize the equivalent impedance of grounded screen 11.Wireless communication module 14 be also configured to
Drop resistance module 13 couples, to send control signal, specifically, control signal discharges friction reducer for controlling drop resistance module 13.
Earth leakage protective device 15 is configured as carrying out overcurrent protection to grounded screen monitoring unit.Specifically, resistance meter 12 and channel radio
Believe that module 14 connects, to send impedance detection signal to wireless communication module 14.Preferably, grounded screen monitoring unit further includes
Downlead 16 and current sensor 17.Wherein, downlead 16 is configured as introducing lightning current (that is, electric current that thunder and lightning generates)
Grounded screen is simultaneously released.Current sensor 17 is connected between grounded screen 11 and downlead 16, is configured as detection and is flowed through grounded screen
11 electric current, specifically, current sensor 17 can be configured as the electric current that grounded screen 11 is flowed through in each cycle detection.It is preferred that
Ground, earth leakage protective device 15 can connect between downlead 16 and current sensor 17.
Grounded screen 11 is multiple metallic ground poles by being embedded in underground certain depth and by conductor that these earthing poles are mutual
The general name of the grounding body of connection composition reticular structure, is widely used in the row such as electric power, building, computer, industrial and mining enterprises, communication
In industry, play the role of security protection, shielding.The equivalent impedance very little of grounded screen, but with the growth of time, grounded screen can be with
Soil contacts for a long time, can be wrapped up by soil, so that equivalent impedance can also gradually increase.Equivalent impedance increase can reduce lightning current
The effect released, it is therefore desirable to the equivalent impedance of periodic monitoring grounded screen.
In the present embodiment, the equivalent impedance of grounded screen 11 can relatively accurately can be measured by resistance meter 12.
Specifically, the equivalent impedance of grounded screen 11 can be measured by earth resistance tester.Earth resistance tester (GRT, Ground
Resistance Tester) it is the Common Instrument for examining measurement of Grounding Resistance, using integrated circuit, using the change of DC/AC
Change the digital grounding resistance tester that three terminals, four terminal measurement methods are merged into a kind of type by technology, the general instrument of ratio of precision
Device is much higher, can be with the low-resistance conductor resistance value of automatic measurement, soil resistivity and voltage.GRT includes that large ground network frequency conversion is big
Current earthing characteristic measuring system, system output power is big, output voltage and output off current HIGH, can comprehensively, accurately measure
The various features parameter of large ground network, for example, earthing reactance, ground resistance, contact voltage, stride a little for it is poor, shift current potential, lead
Be powered resistance, soil resistivity etc..GRT further includes large ground network frequency conversion high current grounding impedance measuring system, system output power
Greatly, output voltage and output off current HIGH, can accurately measure impedance ground, ground resistance, contact point be poor, earthing reactance,
The parameters such as soil resistivity.GRT further includes the anti-interference earth loop impedance test instrument of frequency conversion, and the output power of system is relatively small, defeated
Voltage and output electric current are also relatively small out, can be with precise measurement impedance ground, ground resistance, earthing reactance, conducting resistance, soil
The parameters such as earth resistivity can satisfy the measurement of conventional ground connection network parameters.Therefore, different connect can be selected according to actual needs
Ground resistance tester.It should be understood that such as three terminal ground resistance measuring instruments and four terminal ground resistance measuring instruments can also be used
Measure the equivalent impedance of grounded screen.
Drop resistance module 13 includes friction reducer.Specifically, friction reducer is a kind of good electric conductor, it is suitable for grounded screen
It between soil, can be in close contact with grounded screen, form biggish current flowing face, while can also seep to surrounding soil
Thoroughly, surrounding soil resistivity is reduced, the gentle low resistance region of variation is formed around grounded screen, reduces ground connection to play
The effect of the equivalent impedance of net.
In the present embodiment, module signal can be sended and received by wireless communication.Wireless communication module 14 can be
EnOcean, ZigBee (ZigBee protocol), Z-Wave, Bluetooth (bluetooth), Wi-Fi etc..Specifically, in the present embodiment,
Wireless communication module 14 is ZigBee module.ZigBee is the ground power consumption LAN protocol based on IEEE802.15.4 standard.Its
Feature is short distance, low complex degree, self-organizing, low-power consumption, is suitable for automatic control and remote control field, can be embedded in various
Equipment.After wireless communication module 14 receives the impedance detection signal of the transmission of resistance meter 12, wirelessly by impedance
Detection signal is sent to corresponding server.Wireless communication module 14 can also be coupled with drop resistance module 13, to hinder mould to drop
Block 13 sends control signal, and control drop resistance module 13 discharges friction reducer, reduces the resistance of grounded screen 11.Meanwhile radio communication mold
Block 14 can also be coupled with corresponding terminal in a non-contact manner, be sent to wirelessly receive corresponding server
Command signal, and command signal is sent to corresponding terminal, staff is notified to safeguard in time to grounded screen.It is preferred that
Ground, wireless communication module 14 can also be coupled with current sensor 16, to receive the current detecting of the transmission of current sensor 16
Signal.Wherein, current detection signal includes the time span signal of the peak signal for flowing through the electric current of earth mat 11 and electric current.It is preferred that
Ground, wireless communication module 14 can also store the data of the current detection signal of predetermined quantity in a non-volatile manner.
In the present embodiment, using earth leakage protective device 15 to power supply, the resistance meter 12, nothing in grounded screen monitoring unit
Line communication module 14 and current sensor 16 carry out overcurrent protection.Earth leakage protective device is also known as leakage circuit breakers, is mainly used in electricity
Road occur leak current fault when change route on off operating mode, thus grounded screen monitoring unit is protected, have overload and it is short
The function of road protection.Preferably, earth leakage protective device 15 can connect between downlead 16 and current sensor 17.Specifically,
The earth leakage protective device structure of the utility model embodiment is as follows.
Fig. 2 is the circuit diagram of the earth leakage protective device of the utility model embodiment.As shown in Fig. 2, earth leakage protective device includes electricity
Appearance, resistance, tripping coil, varistor R1, rectification circuit 21, electric leakage chip 22, silicon controlled rectifier (SCR) 23, current detection circuit
24 and switch.
Wherein, tripping coil includes electromagnet and coil, is configured as the on off operating mode of control switch, in the electric leakage of generation
When flowing larger, can drive electromagnet and coil contact, thus control switch disconnect.
The chip 22 that leaks electricity includes the end A, B, C, D, E, F, G, H, and the end A is reference voltage end, with current detection circuit 24 and electricity
Hold C5 connection；The end B is input terminal, is connect with resistance R3；C-terminal is ground terminal；The end D is differential amplification output end, is connected with capacitor C1
It connects；The end E is trigger input, is connect with resistance R2 and capacitor C4；The end F is noise absorbent end, is connect with capacitor C2；The end G is
Output end is connect with capacitor C3；The end H is power voltage terminal.Specifically, electric leakage chip 22 can be IC54123, M54123 etc..
Varistor (VDR, voltage dependent resistor) R1 is a kind of with nonlinear wind vibration
Resistance can absorb extra electric current to protect the equipment and device in circuit.When the both ends of VDR are applied with voltage, VDR energy
A relatively-stationary voltage value is enough reduced the voltage to, to realize the protection to circuit.More specifically, at the both ends VDR
When voltage is lower than first threshold, the impedance of VDR is equivalent to infinity, therefore flows through its electric current very little, is equivalent to open circuit.?
When the voltage at the both ends VDR is higher than first threshold, the impedance of VDR is equivalent to infinitely small, therefore the electric current for flowing through it is very big, is equivalent to
Access, it is possible thereby to protect the equipment and device in circuit by shunting and absorbing extra electric current.
Rectification circuit 21 includes four fast recovery diodes, is configured as AC conversion being direct current.Wherein, fast extensive
Multiple diode (FRD, fast recovery diode) is a kind of semiconductor good with switching characteristic, reverse recovery time section
Diode belongs to PIN junction type diode (that is, increasing base area I among P-type silicon material and N-type silicon materials).Due to base area
I is very thin, and reverse recovery charge very little, so the reverse recovery time of fast recovery diode is shorter, forward voltage drop is lower, reversely hits
It is higher to wear voltage (pressure voltage).Specifically, reverse recovery time refers to electric current by zero point by forward conversion to predetermined threshold
Time interval.The reverse recovery time performance of shorter FRD is higher, rapider to the overcurrent protection of the equipment in circuit.
Silicon controlled rectifier (SCR) 23 is a kind of common electric semiconductor electronic device, being capable of thousands of watts of control switch or even million
Watt grade electrical power.Structurally, silicon controlled rectifier (SCR) is a kind of thyristor of reversed cut-off triode type, by three PN
(tetra- layers of PN-PN) is tied to constitute.Silicon controlled rectifier (SCR) has forward characteristic can that is, when forward voltage voltage is lower than break over voltage
Control silicon rectifier is in the very high closed state of impedance (that is, forward blocking state)；It, can when forward voltage is higher than break over voltage
Control silicon rectifier rapidly goes to the connected state of impedance very little.Thus, it is possible to realize the effect of shunting, the equipment in circuit is protected
And device.
Current detection circuit 24 includes detection coil, magnetic field can be generated when leakage current passes through, so that silicon controlled rectifier
Device 23 is connected to, so that the electric current in earth leakage protective device 15 increases, electromagnet and coil in tripping coil is enabled to connect
Touching.
Downlead 16 is the metal being connected between arrester (for example, lightning rod) and earthing or grounding means (for example, grounded screen)
Lightning current can be introduced grounded screen and released by conductor.It specifically, in the present embodiment, can be using lightning-arrest downlead.It is lightning-arrest
Downlead includes zinc-plated down conductor, copper-plated ground downlead, copper material downlead, superinsulation downlead.It can be according to reality
Need to select the lightning-arrest downlead of unlike material.
Current sensor 17 can experience the information of sensed current, and the information experienced is converted according to certain rules
Information output as the electric signal or other forms for meeting certain standard needs.Current sensor is different according to measuring principle,
It mainly include current divider, electromagnetic current transducer and electronic current mutual inductor etc..Current divider is mainly used for measuring direct current
Stream, while shunting can be played the role of.Electromagnetic current transducer be it is a kind of according to electromagnetic induction principle by first side winding
In the current sensor that measures of the low current that is converted in secondary side winding of high current.Electronic current mutual inductor includes
There is transmission frequency bandwidth, secondary load to hold for Hall current sensor, Rogowski current sensor and variable-frequency power sensor
Measure the feature that small, size is small, light-weight.It should be understood that current sensor be not limited to it is above-mentioned several, can also be according to demand and practical
Situation chooses different current sensors.Since the current amplitude of lightning current is larger, the biggish electric current of range can be chosen
Sensor.
The utility model embodiment automatically controls drop resistance module reduction grounded screen by detecting the equivalent impedance of grounded screen
Equivalent impedance, while overcurrent protection is carried out, to grounded screen can be enabled quick much sooner the processing of grounded screen
Restore to use, while reducing personal damage or economic loss.
The grounded screen monitoring unit of the utility model embodiment can constitute grounded screen monitoring at least one server
System.Wherein, server is configured as storing and receiving the impedance detection signal of the transmission of wireless communication module 13 and current detecting letter
Number, and control signal and/or command signal are sent to wireless communication module 13.Specifically, in the present embodiment, in impedance detection
When signal is higher than first threshold, module 1 controls drop resistance mould to the drop resistance transmission control signal of module 15 to server by wireless communication
Block 15 discharges friction reducer.After discharging friction reducer, server receives the impedance detection signal detected again.In the resistance detected again
When anti-detection signal is lower than first threshold, server stops sending control signal.It is still high in the impedance detection signal of retransmission
When first threshold, repeat the above process.Impedance detection signal is received in server and impedance detection signal is higher than the first threshold
When the number of value is more than n times (n is the predetermined integers more than or equal to 1), module 13 is sent to corresponding terminal by wireless communication
Command signal notifies staff to carry out manual maintenance to grounded screen 11 in time.Similarly, in the present embodiment, in electric current
When peak signal is higher than third threshold value higher than the time span signal of second threshold and electric current, server can be by wireless communication
Module 13 sends command signal to corresponding terminal, and staff is notified to carry out manual maintenance to grounded screen 11.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, for this field
For technical staff, the utility model can have various modifications and changes.All institutes within the spirit and principle of the utility model
Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of grounded screen monitoring unit, comprising:
Grounded screen；
Resistance meter is connect with the grounded screen, is configured as detecting the equivalent impedance of the grounded screen；
Drop resistance module, is configured as reducing the equivalent impedance of the grounded screen；
Wireless communication module is configured as wirelessly sending impedance detection signal and receives control signal；
Earth leakage protective device is configured as carrying out overcurrent protection to the grounded screen monitoring unit；
Wherein, the drop resistance module includes friction reducer, is configured to respond to the control signal, discharges the friction reducer.
2. grounded screen monitoring unit according to claim 1, which is characterized in that the grounded screen monitoring unit further include:
Downlead is configured as lightning current introducing grounded screen and release；
Current sensor is connected between the grounded screen and the downlead, is configured as detection and is flowed through the grounded screen
Electric current.
3. grounded screen monitoring unit according to claim 1, which is characterized in that the resistance meter and the channel radio
Believe module connection, and sends the impedance detection signal to the wireless communication module.
4. grounded screen monitoring unit according to claim 2, which is characterized in that the current sensor be configured as every
The electric current of the grounded screen is flowed through in cycle detection.
5. grounded screen monitoring unit according to claim 1, which is characterized in that the wireless communication module be configured as with
Wirelessly send current detection signal.
6. grounded screen monitoring unit according to claim 5, which is characterized in that the current detection signal includes:
The peak signal of the electric current；And
The time span signal of the electric current.
7. grounded screen monitoring unit according to claim 5, which is characterized in that the wireless communication module be configured as with
The data of the current detection signal of non-volatile storage predetermined quantity.
8. grounded screen monitoring unit according to claim 1, which is characterized in that the wireless communication module be configured as with
It wirelessly receives and sends command signal.
9. a kind of grounded screen monitoring system, comprising:
At least one is such as grounded screen monitoring unit of any of claims 1-8；And
At least one server.
10. grounded screen monitoring system according to claim 9, which is characterized in that the server is configured as receiving simultaneously
Store impedance detection signal and current detection signal that the wireless communication module is sent；And
The control signal and/or command signal are sent to the wireless communication module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821636580.3U CN209148801U (en) | 2018-10-10 | 2018-10-10 | Grounded screen monitoring unit and grounded screen monitoring system |
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| CN201821636580.3U CN209148801U (en) | 2018-10-10 | 2018-10-10 | Grounded screen monitoring unit and grounded screen monitoring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308333A (en) * | 2019-08-12 | 2019-10-08 | 广东电网有限责任公司 | A kind of grounded screen resistance reducing effect test device and method |
| CN110794219A (en) * | 2019-10-15 | 2020-02-14 | 宁夏中科天际防雷检测有限公司 | Intelligent grounding resistance monitoring control instrument for lightning protection engineering and monitoring method |
| CN116316402A (en) * | 2023-05-22 | 2023-06-23 | 江苏安荷电能科技有限公司 | Leakage protection system |
-
2018
- 2018-10-10 CN CN201821636580.3U patent/CN209148801U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308333A (en) * | 2019-08-12 | 2019-10-08 | 广东电网有限责任公司 | A kind of grounded screen resistance reducing effect test device and method |
| CN110794219A (en) * | 2019-10-15 | 2020-02-14 | 宁夏中科天际防雷检测有限公司 | Intelligent grounding resistance monitoring control instrument for lightning protection engineering and monitoring method |
| CN116316402A (en) * | 2023-05-22 | 2023-06-23 | 江苏安荷电能科技有限公司 | Leakage protection system |
| CN116316402B (en) * | 2023-05-22 | 2023-08-08 | 江苏安荷电能科技有限公司 | Leakage protection system |
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