CN206378539U - A kind of high-tension cable monitoring sensor - Google Patents
A kind of high-tension cable monitoring sensor Download PDFInfo
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- CN206378539U CN206378539U CN201621208964.6U CN201621208964U CN206378539U CN 206378539 U CN206378539 U CN 206378539U CN 201621208964 U CN201621208964 U CN 201621208964U CN 206378539 U CN206378539 U CN 206378539U
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Abstract
A kind of high-tension cable monitoring sensor, is related to a kind of sensor.At present, sensor is required for powering using external power source first, and matching component is more, and device is excessively too fat to move, operates with inconvenience.This bright wideband current sensor including for detecting local discharge signal and capacity current；Bus current collector for obtaining bus current；For the signal processing apparatus of signal transacting, it is connected with wideband current sensor, and wideband current sensor output is handled to obtain high-frequency pulse signal, capacity current signal；Cable shield circulation energy taking device for obtaining electric energy from bus, it is connected with signal processing apparatus；For the signal protection device of protection signal processing unit, it is connected with signal processing apparatus.The technical program takes energy using power cable metal screen layer circulation, without additional power source, also saves certain resource, and sensor breaks away from the constraint of additional power source using more independent convenient and swift.
Description
Technical field
The utility model is related to a kind of sensor, especially a kind of high-tension cable monitoring sensor.
Background technology
With the high speed development that super-pressure extra-high voltage grid is built, the use of high voltage power cable is more and more extensive, to electricity
The requirement of the safe operation of power cable also more and more higher.Meanwhile, the early stage cable of laying has arrived normal use year successively now
Limit, in the presence of the factor such as electricity, heat, mechanical external force, the Insulation Problems of cable will increasingly increase, and most probably cause insulation system
The destruction of system.The visual plant transmitted electricity as power system, its safe operation is most important for power system.When its generation event
During barrier, huge directly or indirectly economic loss can be not only produced, moreover, the power failure of large area will also result in serious social shadow
Ring.
To high voltage power cable, due to the limitation of its insulation characterisitic and experimental facilities, also lack effective pre- at present
Anti- property test method, therefore real time on-line monitoring is generally carried out to it using high-tension cable sensor collection cable signal.
Traditional high-tension cable monitoring sensor is frequently with direction coupling sensor, capacitive coupled sensors, ultrasonic wave
Sensor, inductive sensor, optical sensor, extra-high video sensor etc..These sensors, are required for using outside first
Power supply is powered, and thereby results in that a whole set of monitoring device is excessively too fat to move, and matching component is more, operates with inconvenience.Next above-mentioned sensing
Device can only monitor a kind of electrical quantity in synchronization, because high-tension cable local discharge signal is faint, waveform is complicated and changeable, equivalence
Very high frequency, is easily disturbed by external electromagnetic ripple noise signal, and the cable data gathered by a certain sensor is difficult correct
Judge erroneous judgement, the possibility of misjudgement occur during cable operation, it is difficult to ensure the safe and stable operation of power network.Multiple sensors are installed
The fund input of whole monitoring system can then be increased, while making execute-in-place more complicated.
Utility model content
The technical problems to be solved in the utility model and propose technical assignment be to prior art carry out improve with
Improve there is provided a kind of high-tension cable monitoring sensor, cost is reduced to reach, convenient collection purpose.Therefore, the utility model
Take following technical scheme.
A kind of high-tension cable monitoring sensor, it is characterised in that including：
Wideband current sensor for detecting local discharge signal and capacity current；
Bus current collector for obtaining bus current；
For the signal processing apparatus of signal transacting, it is connected with wideband current sensor, defeated to wideband current sensor
Go out signal to be handled to obtain high-frequency pulse signal, capacity current signal；It is connected with bus current collector, to bus current
Collector output signal is handled to obtain Real-time Load value；
Cable shield circulation energy taking device for obtaining electric energy from bus, it is connected with signal processing apparatus, with
Signal processing apparatus is powered；
For the signal protection circuit of protection signal processing unit, it is connected with signal processing apparatus, to protect letter
The mutation of the data acquisition cacaine collection signal of number processing unit and be damaged.
As further improving and supplementing to above-mentioned technical proposal, it is special that the utility model also includes following supplementary technology
Levy.
Further, described signal protection device includes overcurrent protection module, over-voltage protection module and impedance
With circuit.
Further, described cable shield circulation energy taking device include current transformer, protection feedback control module,
Super capacitor charge management module, output control module；Current transformer is used from bus inductive energy and for rear class；Described
Protection feedback control module automatically adjusts the energy size for being transported to rear class according to rear class to the demand of energy, while transient suppression
Peak point current protects late-class circuit not to be damaged, and solves transformer vibration problems during rear class zero load；Charge management module according to
The energy dynamics regulation of mutual inductor coil sensing reaches transformer power output to the charging voltage and charging current of super capacitor
It is maximized while protecting late-class circuit and the component such as super capacitor；Output control module monitors the energy storage situation of super capacitor
DC energy is provided to load equipment.
Further, described protection feedback control module is released including transient state suppression submodule, feedback copped wave and controls son
Module, described transient state, which suppresses submodule, includes transient absorption protection location, rectification filtering unit, voltage regulation unit；Described is anti-
Feedback copped wave releases control submodule including feedback circuit, chop control unit, energy vent unit
Further, described bus current collector include coil, signal adjustment circuit, integrating circuit, phase-shift circuit,
Analog/digital conversion circuit, electro-optical conversion circuit, bus current collector high-pressure side by it is coil-induced go out with tested bus current
The linear signal of rate of change, the signal is after modulate circuit, integrating circuit, phase-shift circuit output, with tested electricity
Same-phase is flowed, is directly proportional；The analog signal that phase-shift circuit is exported is converted into data signal by analog/digital conversion circuit, is then driven
Digital electric signal is converted into optical signal by light source, is passed through by the way that the current information of high-tension cable is converted into light digital signal form
Optical fiber is transferred to low-pressure side, sends into signal processing apparatus.
Further, described bus current collector is sawtooth open-close type bus current collector.
Further, the length of magnetic path of bus current collector is 72cm, and coil turn is 200 circles.
Further, described wideband current sensor include magnetic core, Rogovski coil, filtering and sampling unit with
And electromagnetic shielding box；Rogovski coil is wound on magnetic core, and described Rogovski coil and filtering and sampling unit are equal
In metal shielding box.
Further, the signal band scope of wideband current sensor is 0~30MHZ, and precision is higher than 0.02, and detection is local
Sensitivity during discharge signal<10pC.
Further, the working condition of described wideband current sensor is to be combined from integration and apposition point working condition
Combined type integration working condition, it includes Rogowski coil high frequency from integral element, Active RC outside integral element, passive RC intermediate frequencies
Low frequency integral element and High frequency filter link.
Further, described signal processing apparatus includes the first signal processing unit and secondary signal processing unit；
First signal processing unit is carried out to the signal that the sensor of detection local discharge signal and capacity current is coupled to
Amplification, filtering, detection processing, enable high-frequency pulse signal and capacity current signal effectively to be arrived by data collecting module collected.
In first signal processing unit, module, signal isolation amplification module, are ultimately sent to signal separation unit after filtering, by dividing
Frequency technology, the signal received be divided into frequency 0-1MHz low frequency signal and frequency 1MHz-30MHz high-frequency signal；
Low frequency signal obtains 50Hz cable insulation capacity current by signal demodulator module, is exported by the first delivery outlet, high frequency letter
Number be cable high frequency partial discharge signal, pass through the second delivery outlet export；
The high-tension cable transmission load signal that secondary signal processing unit processes bus current collector is collected, by letter
Number isolation module, and by amplitude limiter circuit and impedance matching circuit, pass through the Real-time Load that the 3rd delivery outlet output cable is transmitted
Value.
Beneficial effect：
(1) the technical program takes energy using power cable metal screen layer circulation, without additional power source, also saves certain
Resource, sensor breaks away from the constraint of additional power source using more independent convenient and swift.
(2) the technical program gathers high frequency Partial discharge signal, cable insulation capacity current, cable transmission load simultaneously, effectively
Ground improves the fault detection efficiency of power cable, reduces the sensor in terms of power cable fault monitoring of power system
Manufacturing cost.
Brief description of the drawings
Fig. 1 is the utility model structure principle chart.
Fig. 2 is cable shield circulation energy taking device schematic diagram of the present utility model.
Fig. 3 is the utility model bus current collector schematic diagram.
Fig. 4 is the utility model bus current collector structural representation.
Fig. 5 is the utility model ultrabroad band sensor circuit schematic diagram.
Fig. 6 is the sensor structure figure of the utility model detection local discharge signal and capacity current.
Fig. 7 is the utility model signal processing apparatus schematic diagram.
Fig. 8 is the utility model signal protection device fundamental diagram.
In figure：1 is high-tension cable；2 be bus current collector；3 be cable shield circulation energy taking device；4 be signal
Processing unit；5 be the input x passages 6 of signal processing apparatus；6 be the input y passages 5 of signal processing apparatus；7 be signal transacting
3rd delivery outlet of device；8 be the second delivery outlet of signal processing apparatus；9 be the first delivery outlet of signal processing apparatus；10 are
Wideband current sensor for detecting local discharge signal and capacity current；11 be high-tension cable ground wire；12 be bus current
Collector locker；13 be signal wire joint；14 be retractable bus current collector upper piece；15 be retractable bus current
Collector bottom sheet；16 be retractable bus current collector sawtooth folding groove；17 be detection local discharge signal and capacity current
Sensor upper piece；18 be the sensor bottom sheet of detection local discharge signal and capacity current；19 be sensor connector；20 be to open
Close axis；21 be signal protection device.
Embodiment
The technical solution of the utility model is described in further detail below in conjunction with Figure of description.
As shown in figure 1, the technical program is main by cable shield circulation energy taking device 3, bus current collector 2, use
In detection local discharge signal and wideband current sensor 10 and signal processing apparatus 4, the signal protection device 21 of capacity current
Five parts are constituted.Being different from conventional sensor needs additional power source, and it takes energy technology using cable shield circulation, passes through one
The individual cable shield being made up of several parts such as current transformer, protection feedback control, super capacitor Charge Management, output controls
Circulation energy taking device 3 obtains the energy, makes sensor using more independent convenient and swift, breaks away from the constraint of additional power source.This technology
Scheme can be while monitor high frequency Partial discharge signal, cable insulation capacity current, cable transmission load in the case of taking energy on the spot.By
Wideband current sensor 10 for detecting local discharge signal and capacity current, the ground wire of high-tension cable 1 can be gathered in real time
11 signals flowed through, the sensor has the collection characteristic of ultrabroad band, and sensor is by magnetic core, Rogovski coil, filtering
With sampling unit and electromagnetic shielding box composition, signal band scope is 0~30MHZ, and the signal collected is sent into by x passages 6
In signal processing apparatus 4, module, signal isolation amplification module, are ultimately sent to signal separation unit, by dividing skill after filtering
Art, the signal received be divided into frequency 0-1MHz low frequency signal and frequency 1MHz-30MHz high-frequency signal.Low frequency
Signal obtains 50Hz cable insulation capacity current by signal demodulator module, is exported by the first delivery outlet 9.High-frequency signal is
For cable local discharge high-frequency pulse signal, exported by the second delivery outlet 8.It can be adopted in real time by bus current collector 2
Collect the load current of the bus of high-tension cable 1, signal processing apparatus 4 is transported to by y passages 5, by signal processing apparatus 4
Signal isolation module, amplitude limiter circuit and impedance matching circuit, the Real-time Load transmitted eventually through the output cable of the 3rd delivery outlet 7
Value.
Specific embodiments of the present invention are as follows：
One：The cable shield circulation energy taking device 3 of Multifunction Sensor, as shown in Fig. 2
Cable shield circulation energy taking device 3 is by current transformer, protection feedback control, super capacitor Charge Management, defeated
Go out a few part compositions such as control.Current transformer is used from bus inductive energy for rear class；Feedback control is protected to press down including transient state
System (transient absorption protection location, rectification filtering unit, voltage regulation unit), feedback copped wave are released control (feedback circuit, copped wave control
System, energy are released), main function is to automatically adjust the energy size for being transported to rear class to the demand of energy according to rear class, simultaneously
Transient suppression peak point current protects late-class circuit not to be damaged, and also solves transformer vibration problems during rear class zero load；Charging
Administrative section main function is charging voltage and charging of the energy dynamics regulation sensed according to mutual inductor coil to super capacitor
Electric current, reaches that transformer power output is maximized while protecting late-class circuit and the components such as super capacitor；Output control part
The energy storage situation of main monitoring super capacitor is divided to provide DC energy to load equipment.
Two：Multifunctional monitoring sensor (is born while monitoring high frequency Partial discharge signal, cable insulation capacity current, cable transmission
Lotus), as shown in Figure 3.
Width of the multifunctional monitoring sensor by bus current collector 2, for detecting local discharge signal and capacity current
The bulk of frequency current sensor 10 3 is constituted.It is as follows per part design principle：
(1) bus current collector 2
Bus current collector 2 has highly stable work frequency collection characteristic, and it passes through improved in high-pressure side
The rate of change that Rogowski coil induces the voltage and tested bus current of high-tension cable 1 is linear, and the signal passes through
After modulate circuit, integrating circuit, phase-shift circuit output, with tested electric current i same-phases, it is directly proportional.Analog/digital conversion circuit is by phase shift
The analog signal of circuit output is converted into data signal, then drives light source (LED), digital electric signal is changed
Into optical signal (E/O conversions).It is transferred to by the way that the current information of high-tension cable 1 is converted into light digital signal form by optical fiber
In low-pressure side, signal processing apparatus 4.It ensure that the stability and accuracy of signal.Bus current collector 2 is sawtooth open-close type
Design, execute-in-place is easy, it is not necessary to cutoff high cable 1, can directly open locker, high-tension cable 1 is entangled.If
The broached-tooth design of meter can make collector upper piece, the perfection laminating of collector bottom sheet, will not loosen dislocation, it is ensured that iron core link
The problem of compactness is not in loose contact, it is ensured that stability monitoring high-tension cable 1 transmits the ability of load.
A. magnetic core is selected
According to Ampere circuit law vertical current plane inner circle loop formula：
When the timing of bus current one, the smaller magnetic field intensity of magnetic core loop is higher, is more conducive to improving power output.Consider
The present apparatus must adapt to the high-tension cable (1) of different voltage class different-diameters, be designed according to maximum inner diameter, while considering to install
Convenience, 210mm is amplified to by the internal diameter of magnetic core.Again according to toroidal core effective magnetic circuit length calculation formula (magnetic core internal diameter ID
For 21cm, external diameter OD is 25cm)：
The length of magnetic path is calculated for 72cm.
B. the number of turn is selected
To prevent from causing because power is excessive equipment to be damaged, coil turn should meet I2<10A, N>100T, according to formula:
With
Determine that equipment coil is chosen to be 200 circles.
Bus current collector 2, as shown in figure 4, retractable bus current collector upper piece 14 and retractable bus current
Collector bottom sheet 15 constitutes collector main body；Signal wire joint 13 can be by inserting the high-tension electricity that signal wire gathers collector
The signal of cable 1 is transferred to signal processing apparatus 4.After bus current collector 2 is coated at bus, and pass through bus current collector
Locker 12 is pinned, and is passed through between retractable bus current collector upper piece 14 and retractable bus current collector bottom sheet 15
Sawtooth folding groove 16 is engaged.
(2) it is used for the wideband current sensor 10 for detecting local discharge signal and capacity current
The sensor has the collection characteristic of ultrabroad band, and sensor is by magnetic core, Rogovski coil, filtering and sampling
Unit and electromagnetic shielding box composition.The signal band scope of the sensor is 0~30MHZ, and precision is up to 0.02, and detection is local
Sensitivity during discharge signal<10pC, ground connection capacity current signal and the pulse of shelf depreciation of power cable can be gathered simultaneously
Signal.Coil around having on the magnetic core of high magnetic permeability in high frequency, and filtering and the design of sampling unit take into account measurement sensitivity
With the requirement of signal response band.In order to suppress interference, signal to noise ratio is improved, and required in view of rain-proof, dust-proof etc., Luo Gaofusi
Lubber ring and filtering sampling unit are all arranged in metal shielding box.
Selected for Rogovski coil in equipment：
Traditional Rogowski coil can be divided into from integration working condition and apposition point working condition by the difference of working condition,
The ultrabroad band sensor that the present invention is designed will integrate the working condition for the compound integration being combined with apposition point working condition certainly.
Compound integral element is by Rogowski coil high frequency from integral element, active R outside integral element, passive RC intermediate frequencies1, C1Low frequency integrates ring
Section and High frequency filter link are constituted.Wherein active integral element resistance RL is feedback resistance, and it can effectively reduce DC current gain,
Output imbalance is reduced, effectively suppresses integrator drift phenomenon, and integration output saturation can be prevented.As shown in Figure 5.
Detect that the sensor construction of local discharge signal and capacity current is as shown in Figure 6：It includes detection shelf depreciation letter
Number connect with the sensor upper piece 17 of capacity current, the sensor bottom sheet 18 of detection local discharge signal and capacity current, sensor
First 19 and the sensor upper piece 17 for connecting detection local discharge signal and capacity current and detection local discharge signal with hold
The folding axis 20 of the sensor bottom sheet 18 of property electric current, makes the sensor upper piece of connecting detection local discharge signal and capacity current
17 and detection local discharge signal and the sensor bottom sheet 18 of capacity current can relatively rotate.
Three：Signal processing apparatus 4
Signal processing apparatus 4 is made up of signal processing unit A and signal processing unit B two parts；Signal processing unit A master
It is that the signal that is coupled to of sensor of detection local discharge signal and capacity current is amplified, filtered, at detection to want function
Reason etc., enables high-frequency pulse signal and capacity current signal effectively to be arrived by data collecting module collected.In signal processing unit A
In, module, signal isolation amplification module, are ultimately sent to signal separation unit after filtering, by frequency splitting technology, what is received
Signal be divided into frequency 0-1MHz low frequency signal and frequency 1MHz-30MHz high-frequency signal.Low frequency signal is examined by signal
Ripple module obtains 50Hz cable insulation capacity current, is exported by the first delivery outlet 9.High-frequency signal is cable high frequency office
Portion's discharge signal, is exported by the second delivery outlet 8.Signal processing unit B major functions are that processing bus current collector 2 is gathered
The transmission load signal of high-tension cable 1 arrived, by signal isolation module, and by amplitude limiter circuit and impedance matching circuit, passes through
The Real-time Load value of the output cable of 3rd delivery outlet 7 transmission.Its schematic diagram is as shown in Figure 7.
4th, signal protection device
Signal protection device mainly includes overcurrent protection module, over-voltage protection module and impedance matching circuit.Mainly
For preventing the signal of collection because of mutation destruction data collecting card.Its fundamental diagram is as shown in Figure 8.
A kind of high-tension cable monitoring sensor shown in figure 1 above -8 is specific embodiment of the utility model,
The utility model substantive distinguishing features and progress are embodied, under enlightenment of the present utility model, it can be entered according to needs are actually used
Equivalent modifications in terms of row shape, structure, this programme protection domain row.
Claims (10)
1. a kind of high-tension cable monitoring sensor, it is characterised in that including：
Wideband current sensor for detecting local discharge signal and capacity current；
Bus current collector for obtaining bus current；
For the signal processing apparatus of signal transacting, it is connected with wideband current sensor, and wideband current sensor is exported and believed
Number handled to obtain high-frequency pulse signal, capacity current signal；It is connected with bus current collector, bus current is gathered
Device output signal is handled to obtain Real-time Load value；
Cable shield circulation energy taking device for obtaining electric energy from bus, it is connected with signal processing apparatus, with to letter
Number processing unit is powered；
For the signal protection device of protection signal processing unit, it is connected with signal processing apparatus, to protect at protection signal
The data acquisition cacaine of reason device gathers the mutation of signal and is damaged.
2. a kind of high-tension cable monitoring sensor according to claim 1, it is characterised in that：Described signal protection dress
Put including overcurrent protection module, over-voltage protection module and impedance matching circuit.
3. a kind of high-tension cable monitoring sensor according to claim 1, it is characterised in that：Described cable shield
Circulation energy taking device includes current transformer, protection feedback control module, super capacitor charge management module, output control mould
Block；Current transformer is used from bus inductive energy and for rear class；Described protection feedback control module is according to rear class to energy
Demand automatically adjust the energy size for being transported to rear class, while transient suppression peak point current protects late-class circuit not to be damaged,
Solve transformer vibration problems during rear class zero load；The energy dynamics regulation pair that charge management module senses according to mutual inductor coil
The charging voltage and charging current of super capacitor, reach that transformer power output is maximized while protecting the rear classes such as super capacitor
Circuit and component；The energy storage situation of output control module monitoring super capacitor provides DC energy to load equipment.
4. a kind of high-tension cable monitoring sensor according to claim 3, it is characterised in that：Described protection feedback control
Molding block includes transient state and suppresses submodule, feedback copped wave releasing control submodule, and described transient state, which suppresses submodule, includes transient state
Absorb protection location, rectification filtering unit, voltage regulation unit；Described feedback copped wave release control submodule including feedback circuit,
Chop control unit, energy vent unit.
5. a kind of high-tension cable monitoring sensor according to claim 1, it is characterised in that：Described bus current is adopted
Storage includes coil, signal adjustment circuit, integrating circuit, phase-shift circuit, analog/digital conversion circuit, electro-optical conversion circuit, bus electricity
Flow collector high-pressure side by it is coil-induced go out the signal linear with the rate of change of tested bus current, signal warp
Cross after modulate circuit, integrating circuit, phase-shift circuit output, with tested current in phase position, be directly proportional；Analog/digital conversion circuit will be moved
The analog signal of circuitry phase output is converted into data signal, then drives light source that digital electric signal is converted into optical signal, passes through
The current information of high-tension cable is converted into light digital signal form by optical fiber and is transferred to low-pressure side, signal processing device is sent into
Put.
6. a kind of high-tension cable monitoring sensor according to claim 5, it is characterised in that：Described bus current is adopted
Storage is sawtooth open-close type bus current collector.
7. a kind of high-tension cable monitoring sensor according to claim 1, it is characterised in that：Described wideband electric current is passed
Sensor includes magnetic core, Rogovski coil, filtering and sampling unit and electromagnetic shielding box；Rogovski coil is wound on magnetic
On core, described Rogovski coil and filtering and sampling unit are installed in metal shielding box.
8. a kind of high-tension cable monitoring sensor according to claim 7, it is characterised in that：Wideband current sensor
Signal band scope is 0~30MHZ, and precision is higher than 0.02, sensitivity during detection local discharge signal<10pC.
9. a kind of high-tension cable monitoring sensor according to claim 7, it is characterised in that：Described wideband electric current is passed
The working condition of sensor is the combined type integration working condition being combined from integration and apposition point working condition, and it includes Roche line
High frequency is enclosed from integral element, Active RC low frequency integral element and High frequency filter link outside integral element, passive RC intermediate frequencies.
10. a kind of high-tension cable monitoring sensor according to claim 1, it is characterised in that：Described signal transacting
Device includes the first signal processing unit and secondary signal processing unit；
First signal processing unit is amplified to the signal that is coupled to of sensor of detection local discharge signal and capacity current,
Filtering, detection processing, enable high-frequency pulse signal and capacity current signal effectively to be arrived by data collecting module collected；In the first letter
In number processing unit, module, signal isolation amplification module, are ultimately sent to signal separation unit after filtering, by frequency splitting technology,
The signal received be divided into frequency 0-1MHz low frequency signal and frequency 1MHz-30MHz high-frequency signal；Low frequency signal
50Hz cable insulation capacity current is obtained by signal demodulator module, is exported by the first delivery outlet, high-frequency signal is electricity
Cable high frequency partial discharge signal, is exported by the second delivery outlet；
High-tension cable that secondary signal processing unit processes bus current collector is collected transmission load signal, by signal every
From module, and by amplitude limiter circuit and impedance matching circuit, the Real-time Load value transmitted by the 3rd delivery outlet output cable.
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| CN201621208964.6U CN206378539U (en) | 2016-11-09 | 2016-11-09 | A kind of high-tension cable monitoring sensor |
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| CN201621208964.6U CN206378539U (en) | 2016-11-09 | 2016-11-09 | A kind of high-tension cable monitoring sensor |
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| CN108918939A (en) * | 2018-07-17 | 2018-11-30 | 昆明理工大学 | A kind of current measuring device that high-precision is easy to install |
| CN109557602A (en) * | 2018-12-29 | 2019-04-02 | 河南鑫安利安全科技股份有限公司 | Portable meteorological measuring set control system |
| CN111366772A (en) * | 2020-03-25 | 2020-07-03 | 四川信息职业技术学院 | Cable sheath circulation collection system based on CT gets electricity |
| WO2020163961A1 (en) * | 2019-02-14 | 2020-08-20 | HYDRO-QUéBEC | Partial discharge detector and associated method |
| CN111751656A (en) * | 2020-06-05 | 2020-10-09 | 水木源华电气有限公司 | Voltage and current measurement energy-taking device for power transmission and distribution line |
| CN111829675A (en) * | 2020-08-06 | 2020-10-27 | 广东电网有限责任公司佛山供电局 | Temperature measuring device of power distribution network monitoring system |
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| CN111829675A (en) * | 2020-08-06 | 2020-10-27 | 广东电网有限责任公司佛山供电局 | Temperature measuring device of power distribution network monitoring system |
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