CN106813803A - DC transmission deep well type earthing pole temperature measuring equipment, temperature online monitoring system and its monitoring method - Google Patents
DC transmission deep well type earthing pole temperature measuring equipment, temperature online monitoring system and its monitoring method Download PDFInfo
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- CN106813803A CN106813803A CN201710047558.9A CN201710047558A CN106813803A CN 106813803 A CN106813803 A CN 106813803A CN 201710047558 A CN201710047558 A CN 201710047558A CN 106813803 A CN106813803 A CN 106813803A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
The present invention relates to a kind of DC transmission deep well type earthing pole temperature measuring equipment, including it is arranged at the feed rod of underground, the temperature measuring optical cable being fixed in the feed rod and the optical signal of the temperature measuring optical cable is converted to the demodulator of PM signal PM of temperature signal；The signal demodulator is electrically connected with the temperature measuring optical cable, and the temperature measuring optical cable extends to top from the bottom of the feed rod.As a result of temperature measuring optical cable, such that it is able to realize the temperature monitoring of gamut in whole feed rod, textural anomaly is simple, easy construction, and maintainable good, reliability is high.
Description
Technical field
The present invention relates to earthing pole thermometry field, more particularly to a kind of DC transmission deep well type earthing pole thermometric dress
Put, temperature online monitoring system and its monitoring method.
Background technology
Use bipolar two ends neutral grounding mode more the DC transmission system of China, direct current is built using the earthing mode
Transmission system, need to respectively build a direct current grounding pole in sending end and receiving end.A kind of wherein common mode connects for vertical shallow buried type
Earth polar scheme, the electrode of vertical shallow buried type earthing pole is embedded in below ground 40m or so, electrode because the influence of earth current may
Produce the too high situation of local temperature, if therefore can place dry temperature sensor in wherein mouth electrode wells, enter trip temperature and supervise
Survey, but traditional sensors thermometric technique, can only measure certain point temperature, to test the temperature of gamut, it is necessary to sensing
Device quantity is more, expensive, and the fault rate of sensor is high.On the other hand, the core of traditional sensors temperature thermometric technique
Part is Fibre Optical Sensor, and certain pressure, general temperature sensor environment can be born after electrode filling petroleum coke
Compression strength is 1MPa, and the pressure of petroleum coke can be born in the case where electrode wells are tens meters, if electrode wells are very deep,
Reach 1000m or so, then environmental stress is up to 10MPa, the sensor then cisco unity malfunction, so traditional sensors are surveyed
Warm technique is not suitable for the temperature monitoring of deep-well type earthing pole.
The content of the invention
Based on this, it is necessary to provide a kind of DC transmission deep well type earthing pole temperature measuring equipment, temperature online monitoring system and
Its monitoring method, is easy in relatively small geographic areas, arranges earth electrode.
Its technical scheme is as follows：
A kind of DC transmission deep well type earthing pole temperature measuring equipment, including be arranged at the feed rod of underground, be fixed on the feedback
Temperature measuring optical cable on torch and the optical signal of the temperature measuring optical cable is converted to the demodulator of PM signal PM of temperature signal；The signal
Demodulator is electrically connected with the temperature measuring optical cable, and the temperature measuring optical cable extends to top from the bottom of the feed rod.
Above-mentioned DC transmission deep well type earthing pole temperature measuring equipment, temperature monitoring is carried out using temperature measuring optical cable, and temperature measuring optical cable was both
As sensor, and as signal transmission medium, any point of optical cable can gathered data, such that it is able to realize whole feed
The temperature monitoring of gamut on rod, textural anomaly is simple, convenient construction.
Technical scheme is illustrated further below：
Wherein in one embodiment, the temperature measuring optical cable is fixed with the feed rod by anchor ear.
Wherein in one embodiment, the temperature measuring optical cable includes fiber unit, coats the reinforced pipe of the fiber unit,
And it is covered in the metal net outside the reinforced pipe.
Wherein in one embodiment, ointment is filled with the reinforced pipe.
Wherein in one embodiment, the metal net is overcoating to be stamped Teflon protective case.
Wherein in one embodiment, at least two leading cables are arranged at intervals with the feed rod.
Wherein in one embodiment, the earthing pole temperature measuring equipment also includes the passive power source powered to demodulator of PM signal PM
Component, the passive power source component includes wind energy converting unit and luminous energy converting unit.
The technical program additionally provides a kind of DC transmission deep well type earthing pole temperature online monitoring system, including above-mentioned
Anticipate a kind of DC transmission deep well type earthing pole temperature measuring equipment, also wirelessly sent out including monitoring host computer and by temperature signal
The wireless signal transceiver of the monitoring host computer is delivered to, the wireless signal transceiver is electrically connected with residing demodulator of PM signal PM.
Technical scheme is illustrated further below：
Wherein in one embodiment, the temperature online monitoring system includes the at most three DC transmission deep well types
Earthing pole temperature measuring equipment.
The technical program additionally provides a kind of DC transmission deep well type earthing pole on-line temperature monitoring method, using feedback
Temperature measuring optical cable is inserted underground by torch；Using the temperature of each position in feed rod described in temperature measuring optical cable sensing whole piece；Use letter
The optical signal of the temperature measuring optical cable is converted to temperature signal by number demodulator；Temperature signal is sent out by wireless signal transceiver again
Deliver to monitoring host computer；The last monitoring host computer to data working process, and monitoring host computer show in real time, record storage or super
Temperature alarm.
Brief description of the drawings
Fig. 1 is DC transmission deep well type earthing pole temperature measuring equipment positive structure schematic of the present invention；
Fig. 2 is DC transmission deep well type earthing pole temperature measuring equipment overlooking the structure diagram of the present invention；
Fig. 3 is the cross-sectional view of temperature measuring optical cable of the present invention；
Fig. 4 is DC transmission deep well type earthing pole temperature online monitoring system schematic diagram of the present invention；
Fig. 5 is DC transmission deep well type earthing pole on-line temperature monitoring method schematic diagram of the present invention.
Description of reference numerals：
1st, feed rod；11st, block is settled；12nd, anchor ear；13rd, leading cable；14th, blast pipe；15th, petroleum coke；2nd, temperature measuring optical
Cable；21st, fiber unit；22nd, reinforced pipe；23rd, metal net；24th, Teflon protective case；25th, high temperature-proof lubricating oil；3rd, signal
Demodulator；4th, passive power source component；41st, wind energy converting unit；42nd, luminous energy converting unit；5th, wireless signal transceiver；51st, believe
Number transmitting element；52nd, signal receiving unit；6th, monitoring host computer.
Specific embodiment
To make the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing and specific embodiment party
Formula, is described in further detail to the present invention.It should be appreciated that specific embodiment described herein is only used to solve
The present invention is released, protection scope of the present invention is not limited.
It should be noted that when element is referred to as " being fixed on " another element, it can directly on another element
Or can also there is element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left side ",
For illustrative purposes only, it is unique implementation method to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the implementation method of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more
The arbitrary and all of combination of related Listed Items.
Heretofore described " first ", " second " do not represent specific quantity and order, are only used for the differentiation of title.
As shown in figure 1, DC transmission deep well type earthing pole temperature measuring equipment of the present invention, including it is vertically arranged at underground
Feed rod 1, the temperature measuring optical cable 2 being fixed in the feed rod 1 and by the optical signal of the temperature measuring optical cable 2 be converted to temperature letter
Number demodulator of PM signal PM 3, around the DC transmission deep well type earthing pole temperature measuring equipment be filled with petroleum coke 15, by institute
State the electric current in feed rod 1 and guide the earthing effect that the feed rod 1 is improved to the earth.Preferably, in the feed rod 1 also
It is fixed with blast pipe 14, the blast pipe 14 is atactic copolymerized polypropene (PPR) material, high temperature resistance, the blast pipe 14 can be with
Gas in the petroleum coke 15 is excluded in time, the environment pressure of the DC transmission deep well type earthing pole temperature measuring equipment is prevented
Power is excessive.
The resistivity of the feed rod 1 is smaller, is combined by more piece cylinder, in the present embodiment, the feed rod 1 it is straight
Footpath is 73mm, and pipe thickness is 1.8mm, and the material of the feed rod 1 is iron, and price is more economical and practical, in other realities
Apply in example, the material of the feed rod 1 can be graphite, high-silicon cast iron, high-silicon chromium iron, ferrite or copper etc..Preferably, institute
State and be also arranged at intervals with feed rod 1 at least two leading cables 13, the leading cable 13 electrically connects with the feed rod 1
Connect, after upwardly extending convergence, be connected to transmission system, electric current can be divided into some branch roads, and drainage by the leading cable 13
To the different parts of feed rod 1, then petroleum coke 15 is induced current into by feed rod 1, finally flow into the earth, it is to avoid feed rod 1
The current density of upper certain point is excessive, causes local temperature too high, and in the present embodiment, the quantity of the leading cable 13 is
Three.
Apart from earth's surface 20m, bottom is connected with sedimentation block 11 to the top of the feed rod 1 so that the feed rod 1 can be steady
Determine, accurately sink to shaft bottom, the depth of well can be 500m or deeper, to induce current into ground end depths, so as to realize
In less construction area, more electric currents are guided, solve the land resource situation in short supply that earth electrode is installed.In this implementation
In example, the material of the sedimentation block 11 is metal, and is electrically conducted with the feed rod 1, further, the sedimentation block 11
Material is iron, to strengthen the electric conductivity of the feed rod 1 to a certain extent, in other embodiments, the sedimentation block 11
It can be the larger material of any density.At least one anchor ear 12 (such as Fig. 2) is additionally provided with the feed rod 1, with fixation
Temperature measuring optical cable 2, is on the one hand to make the temperature measuring optical cable 2 together sink to installing with the feed rod 1, on the other hand can prevent institute
Arbitrarily rocking after temperature measuring optical cable 2 is installed is stated, the stability of the temperature measuring optical cable 2 is influenceed；The leading cable 13 and the row
Tracheae 14 is also attached on the anchor ear 12.
The temperature measuring optical cable 2 extends to top from the bottom of the feed rod 1, is ultimately connected to signal demodulator.Thermometric
Optical cable 2 both as sensor, and as signal transmission medium, any point on temperature measuring optical cable 2 can gathered data so that can
To realize the temperature monitoring of gamut in whole feed rod 1, and it is not used in underground and is powered to temperature measuring optical cable 2, textural anomaly letter
Single, convenient construction, maintainable good, reliability are high.
As shown in figure 3, the temperature measuring optical cable 2 includes fiber unit 21, coats the reinforced pipe 22 of the fiber unit 21, with
And the metal net 23 outside the reinforced pipe 22 is covered in, by reinforced pipe 22 and metal net 23, strengthen the thermometric
The compressive property of optical cable 2, makes the temperature measuring optical cable 2 be adapted to the pressure that the petroleum coke 15 of shaft bottom depths brings, without producing
Change shape, prevents the radial force of fiber unit 21, makes to attenuated optical signal, causes temperature to measure, it is preferred that the reinforcement
Pipe 22 is seamless steel pipe, and the metal net 23 is steel matter.In the present embodiment, the quantity of the fiber unit 21 is two
Root, plays safety effect, when wherein one because accidental damage, it is impossible to which when detecting detection temperature, another fiber unit 21 can
So that used as standby original paper, in other embodiments, the quantity of the fiber unit 21 can be one or more temporarily.Described
Metal net 23 is overcoating to be stamped Teflon protective case 24 so that the temperature measuring optical cable 2 can acidproof, alkaline-resisting, high temperature resistant and
Waterproof, reduces the destroyed possibility of fiber unit 21, meanwhile, prevent reinforced pipe 22 and metal net 23 to be corroded.Further
, in the present embodiment, high temperature-proof lubricating oil 25 is also filled with the reinforced pipe 22 so that optical fiber in reinforced pipe 22 all the time
In free state, reduce and collided the active force being subject to reinforced pipe 22.The temperature measuring optical cable 2 can be realized in 15MPa
Compression strength, the long-term permission tensile force in 1000N, the short-term permission tensile force in 1500N, and with long-term 3000N/
The permission flat pressure of 10cm, the permission flat pressure of short-term 4000N/10cm is adapted to -40 DEG C -120 DEG C of temperature change.
The signal demodulator receives the optical signal from the temperature measuring optical cable 2, and converts optical signals to temperature signal,
For statistics, observation.Optionally, the signal demodulator is powered using passive power source component 4, to solve remote mountain area
The difficult problem of power supply, the passive power source component 4 includes wind energy converting unit 41 and luminous energy converting unit 42, uses wind energy and luminous energy
Simultaneously for signal demodulator is powered, to avoid powering-off state, wind energy is converted to electric energy and luminous energy conversion by wind energy converting unit 41
The specific works mode that unit 42 converts light energy into electric energy can be achieved by the prior art, and will not be repeated here.
As shown in figure 4, a kind of DC transmission deep well type earthing pole temperature online monitoring system of the present invention, including it is above-mentioned
The DC transmission deep well type earthing pole temperature measuring equipment of any one, also including monitoring host computer 6 and by temperature signal with wireless
Mode is sent to the wireless signal transceiver 5 of the monitoring host computer 6, the wireless signal transceiver 5 and residing demodulator of PM signal PM 3
It is electrically connected with.
The quantity of the DC transmission deep well type earthing pole temperature measuring equipment is up to three, reduces floor space, described straight
Stream transmission of electricity deep-well type earthing pole temperature measuring equipment shares a signal demodulator and wireless signal transceiver 5, with cost-effective.
The wireless signal transceiver 5 includes signal transmitting unit 51 and signal receiving unit 52, and the signal sends single
Unit 51 is electrically connected with the signal demodulator, and the temperature signal that the signal demodulator is converted to is with wireless signal
Form is sent, and the signal transmitting unit 51 is equally powered by passive power source；The signal receiving unit 52 and the prison
Control main frame 6 is electrically connected with, and the signal receiving unit 52 receives the wireless signal that the signal transmitting unit 51 sends out, and
Monitoring host computer 6 is sent to, so as to be grounded the remote on-line monitoring function of pole temperature.
The monitoring host computer 6 is stored the signal received from the signal receiving unit 52, and on screen
Display real time temperature signal, draws temperature variation curve.User can set alarm temperature value and alarm mode, alarm mode bag
Overtemperature alarm, the i.e. temperature value more than setting is included to alarm；Differential temperature is alarmed, that is, reach the temperature rise value alarm of setting；Temperature rise rate report
It is alert, that is, the temperature rise rate alarm of setting is reached, each alarm mode can be used alone or in combination.For the temperature number for storing
According to monitoring host computer 6 will provide automatically and manually form (day month year), and allow user to generate form, side by exact date
Just the inquiry of historical data, contrast and analysis.
As shown in figure 5, a kind of DC transmission deep well type earthing pole on-line temperature monitoring method of the present invention, can be applied to
DC transmission deep well type earthing pole temperature online monitoring system described in Fig. 4, comprises the following steps：
S01：Temperature measuring optical cable 2 is inserted into missile silo bottom using feed rod 1, and is fixed together with the feed rod 1；
S02：Using the temperature of each position in feed rod 1 described in the sensing whole piece of temperature measuring optical cable 2, rather than the temperature of point type
Detection；
S03：The optical signal of the temperature measuring optical cable 2 is converted into temperature signal using demodulator of PM signal PM 3, and is sent to wireless
Signal transceiver 5；
S04：Wireless signal transceiver 5 receives the signal sended over from the demodulator of PM signal PM 3, then by temperature signal
Send to monitoring host computer 6；
S05：Monitoring host computer 6 is to data working process, and the real-time display of monitoring host computer 6, record storage or overtemperature alarm.
Specifically, the monitoring host computer 6 is stored the signal received from the signal receiving unit 52, and show on screen
Show real time temperature signal, draw temperature variation curve.User can set alarm temperature value and alarm mode, and alarm mode includes
Overtemperature alarm, the i.e. temperature value more than setting are alarmed；Differential temperature is alarmed, that is, reach the temperature rise value alarm of setting；Temperature rise rate is alarmed,
The temperature rise rate alarm of setting is reached, each alarm mode can be used alone or in combination.For the temperature data for storing, prison
Control main frame 6 will provide automatically and manually form (day month year), and allow user to generate form by exact date, facilitate history
Inquiry, contrast and the analysis of data.
The method is monitored using temperature measuring optical cable 2 to the temperature of whole piece feed rod 1, and the monitoring relative to point type is more complete
Face and accurate, without in underground for temperature measuring optical cable 2 is powered, enhanced convenience；Signal hair is carried out using wireless signal transceiver 5
Send, can be communicated at a distance, facilitate remote online to observe.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of DC transmission deep well type earthing pole temperature measuring equipment, it is characterised in that including：It is arranged at the feed rod of underground, consolidates
The signal demodulation of temperature signal is converted to due to the temperature measuring optical cable in the feed rod and by the optical signal of the temperature measuring optical cable
Device；The signal demodulator is electrically connected with the temperature measuring optical cable, and the temperature measuring optical cable is extended to from the bottom of the feed rod
Top.
2. DC transmission deep well type earthing pole temperature measuring equipment according to claim 1, it is characterised in that the temperature measuring optical cable
Fixed by anchor ear with the feed rod.
3. DC transmission deep well type earthing pole temperature measuring equipment according to claim 1, it is characterised in that the temperature measuring optical cable
Including fiber unit, the reinforced pipe of the fiber unit is coated, and be covered in the metal net outside the reinforced pipe.
4. DC transmission deep well type earthing pole temperature measuring equipment according to claim 3, it is characterised in that in the reinforced pipe
Filled with ointment.
5. DC transmission deep well type earthing pole temperature measuring equipment according to claim 3, it is characterised in that described metal knitted
Net is overcoating to be stamped Teflon protective case.
6. DC transmission deep well type earthing pole temperature measuring equipment according to claim 1, it is characterised in that in the feed rod
It is arranged at intervals with least two leading cables.
7. DC transmission deep well type earthing pole temperature measuring equipment according to claim 1, it is characterised in that the earthing pole is surveyed
Warm device also includes the passive power source component powered to demodulator of PM signal PM, the passive power source component include wind energy converting unit and
Luminous energy converting unit.
8. a kind of DC transmission deep well type earthing pole temperature online monitoring system, it is characterised in that any to power 6 including such as power 1
The DC transmission deep well type earthing pole temperature measuring equipment of one, also wirelessly sends out including monitoring host computer and by temperature signal
The wireless signal transceiver of the monitoring host computer is delivered to, the wireless signal transceiver is electrically connected with residing demodulator of PM signal PM.
9. DC transmission deep well type earthing pole temperature online monitoring system according to claim 8, it is characterised in that described
Temperature online monitoring system includes the at most three DC transmission deep well type earthing pole temperature measuring equipments.
10. a kind of DC transmission deep well type earthing pole on-line temperature monitoring method, it is characterised in that including：
Temperature measuring optical cable is inserted into underground using feed rod；
Using the temperature of each position in feed rod described in temperature measuring optical cable sensing whole piece；
The optical signal of the temperature measuring optical cable is converted into temperature signal using demodulator of PM signal PM；
Temperature signal is sent to monitoring host computer by wireless signal transceiver again；
The last monitoring host computer to data working process, and monitoring host computer show in real time, record storage or overtemperature alarm.
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| CN201710047558.9A CN106813803A (en) | 2017-01-22 | 2017-01-22 | DC transmission deep well type earthing pole temperature measuring equipment, temperature online monitoring system and its monitoring method |
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| CN201710047558.9A CN106813803A (en) | 2017-01-22 | 2017-01-22 | DC transmission deep well type earthing pole temperature measuring equipment, temperature online monitoring system and its monitoring method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109142429A (en) * | 2017-06-15 | 2019-01-04 | 南方电网科学研究院有限责任公司 | A kind of detection system and detection method of vertical grounding electrode temperature characteristic |
| CN110048246A (en) * | 2018-01-17 | 2019-07-23 | 南方电网科学研究院有限责任公司 | A kind of connection structure, deep-well type vertical grounding electrode and its assembly method |
| CN110048248A (en) * | 2018-01-17 | 2019-07-23 | 南方电网科学研究院有限责任公司 | A kind of connector, deep-well type vertical grounding electrode and its assembly method |
| CN110470413A (en) * | 2019-08-30 | 2019-11-19 | 南方电网科学研究院有限责任公司 | A kind of deep-well type earthing pole temperature online monitoring system |
| CN110600901A (en) * | 2019-08-26 | 2019-12-20 | 南方电网科学研究院有限责任公司 | Deep well grounding electrode and deep well grounding electrode monitoring system |
| CN110600902A (en) * | 2019-08-30 | 2019-12-20 | 南方电网科学研究院有限责任公司 | Exhaust system of deep well type earthing pole |
| WO2021052001A1 (en) * | 2019-09-20 | 2021-03-25 | 南方电网科学研究院有限责任公司 | Exhaust system for deep well-type direct current grounding electrode |
| CN113406532A (en) * | 2021-05-21 | 2021-09-17 | 中国电力科学研究院有限公司 | Direct current grounding electrode element with state monitoring function |
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| 赵笑琦: "特高压直流输电接地极在线监测系统设计", 《中国优秀硕士学位论文全文数据库（工程科技Ⅱ辑）》 * |
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| CN109142429B (en) * | 2017-06-15 | 2024-04-16 | 南方电网科学研究院有限责任公司 | Detection system and detection method for temperature rise characteristic of vertical grounding electrode |
| CN110048246A (en) * | 2018-01-17 | 2019-07-23 | 南方电网科学研究院有限责任公司 | A kind of connection structure, deep-well type vertical grounding electrode and its assembly method |
| CN110048248A (en) * | 2018-01-17 | 2019-07-23 | 南方电网科学研究院有限责任公司 | A kind of connector, deep-well type vertical grounding electrode and its assembly method |
| CN110048246B (en) * | 2018-01-17 | 2021-01-22 | 南方电网科学研究院有限责任公司 | Connection structure, deep well type vertical grounding electrode and assembly method thereof |
| WO2021036608A1 (en) * | 2019-08-26 | 2021-03-04 | 南方电网科学研究院有限责任公司 | Deep well grounding electrode and deep well grounding electrode monitoring system |
| CN110600901A (en) * | 2019-08-26 | 2019-12-20 | 南方电网科学研究院有限责任公司 | Deep well grounding electrode and deep well grounding electrode monitoring system |
| CN110470413A (en) * | 2019-08-30 | 2019-11-19 | 南方电网科学研究院有限责任公司 | A kind of deep-well type earthing pole temperature online monitoring system |
| WO2021036611A1 (en) * | 2019-08-30 | 2021-03-04 | 南方电网科学研究院有限责任公司 | Online temperature monitoring system for deep well-type grounding electrode |
| WO2021036609A1 (en) * | 2019-08-30 | 2021-03-04 | 南方电网科学研究院有限责任公司 | Exhaust system for deep well-type ground electrode |
| CN110600902A (en) * | 2019-08-30 | 2019-12-20 | 南方电网科学研究院有限责任公司 | Exhaust system of deep well type earthing pole |
| WO2021052001A1 (en) * | 2019-09-20 | 2021-03-25 | 南方电网科学研究院有限责任公司 | Exhaust system for deep well-type direct current grounding electrode |
| CN113406532A (en) * | 2021-05-21 | 2021-09-17 | 中国电力科学研究院有限公司 | Direct current grounding electrode element with state monitoring function |
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