CN106786354A - Over-pressure safety device and electric power system - Google Patents
Over-pressure safety device and electric power system Download PDFInfo
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- CN106786354A CN106786354A CN201710098492.6A CN201710098492A CN106786354A CN 106786354 A CN106786354 A CN 106786354A CN 201710098492 A CN201710098492 A CN 201710098492A CN 106786354 A CN106786354 A CN 106786354A
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- Prior art keywords
- relay
- protection chip
- signal
- direct current
- safety device
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides a kind of over-pressure safety device and electric power system, being related to the technical field of safe power supply, effectively can protect transmission line of electricity when there is overvoltage, improve the security of transmission line of electricity.The over-pressure safety device, including induction coil, rectification circuit and protection chip；The induction coil is used to be wrapped in the secondary iron core of transformer, and produces alternating current impression signal；The rectification circuit is connected between the induction coil and the protection chip, and the alternating current impression signal rectification is direct current induced signal by the rectification circuit；The protection chip receives the direct current induced signal, and when the direct current induced signal exceeds preset value, the protection chip exports power-off signal.
Description
Technical field
The present invention relates to safe power supply technical field, more particularly, to a kind of over-pressure safety device and electric power system.
Background technology
With the development of power technology, industrial-frequency alternating current (i.e. civil power) has spread all over each family and unit, electricity consumption
Security also becomes more and more important.
Current civil power is generally powered by two output lines, wherein one is live wire, another is zero line, live wire and zero line
Between voltage be line voltage.In actual power supply process, it is impossible to be completely secured and worked under rated voltage, but
An operated within range near rated voltage.If output voltage is higher by the 15% of rated voltage, generally just it was identified as
Pressure phenomenon.Zero line is stolen, ageing equipment, technical failure, man-made fault, natural calamity, power failure are sent a telegram here again etc., and reason is likely to
Cause over-pressed phenomenon, overvoltage can be generated heat using electric equipment, puncture, burns out, or even cause fire, therefore it is ten to take precautions against over-pressed phenomenon
Divide necessary.
Current overvoltage protector is typically with the modes such as air switch or relay, to the electricity of the outlet line of civil power
Pressure is monitored.When the voltage of outlet line is excessive, using the mode such as air switch or relay disconnection, outlet line is cut off
Power supply, to realize the protection of circuit and electrical equipment.But, the sensitivity of existing overvoltage protector is relatively low, is occurring
Effectively circuit can not be protected during pressure.
The content of the invention
In view of this, it is an object of the invention to provide a kind of over-pressure safety device and electric power system, can occur
Transmission line of electricity effectively is protected when over-pressed, the security of transmission line of electricity is improve.
In a first aspect, a kind of over-pressure safety device is the embodiment of the invention provides, including induction coil, rectification circuit and guarantor
Shield chip；
The induction coil is used to be wrapped in the secondary iron core of transformer, and produces alternating current impression signal；
The rectification circuit is connected between the induction coil and the protection chip, and the rectification circuit is by the friendship
The rectification of influenza induction signal is direct current induced signal；
The protection chip receives the direct current induced signal, described when the direct current induced signal exceeds preset value
Protection chip output power-off signal.
With reference in a first aspect, the embodiment of the invention provides the first possible implementation method of first aspect, wherein, institute
Rectification circuit is stated for rectifier bridge.
With reference in a first aspect, the embodiment of the invention provides second possible implementation method of first aspect, wherein, should
Over-pressure safety device also includes the filter circuit and amplifying circuit that are connected between the rectification circuit and the protection chip.
With reference in a first aspect, the embodiment of the invention provides the third possible implementation method of first aspect, wherein, institute
Stating protection chip includes comparing unit and trigger element；
The comparing unit receives the direct current induced signal, and the direct current induced signal and the preset value are carried out
Compare；
When the direct current induced signal exceeds preset value, the trigger element exports power-off signal.
With reference in a first aspect, the embodiment of the invention provides the 4th kind of possible implementation method of first aspect, wherein, institute
State and be provided with multistable trigger in trigger element；
When the direct current induced signal exceeds preset value, the multistable trigger exports power-off signal.
Second aspect, the embodiment of the present invention also provides a kind of electric power system, including transformer and above-mentioned overvoltage protection
Device；
The primary coil connection power network of the transformer, secondary coil connection ac output end；
Induction coil in the over-pressure safety device is wrapped in the secondary iron core of transformer.
With reference to second aspect, the first possible implementation method of second aspect is the embodiment of the invention provides, wherein, should
Electric power system also includes the first relay；
The output end of the protection chip connects the control end of first relay.
With reference to second aspect, second possible implementation method of second aspect is the embodiment of the invention provides, wherein, institute
The first output end for stating protection chip connects the control coil of first relay by bidirectional triode thyristor；
Second output end of the protection chip connects the control end of the bidirectional triode thyristor by current-limiting resistance.
With reference to second aspect, the third possible implementation method of second aspect is the embodiment of the invention provides, wherein, should
Electric power system also includes the second relay；
The output end of first relay is connected with the control coil of second relay, second relay
Output end is connected with the primary coil.
With reference to second aspect, the 4th kind of possible implementation method of second aspect is the embodiment of the invention provides, wherein, institute
The first relay is stated for closed type relay, second relay is normal-open type relay.
The embodiment of the present invention brings following beneficial effect：
In over-pressure safety device provided in an embodiment of the present invention, including induction coil, rectification circuit and protection chip.Its
In, induction coil is used to be wrapped in the secondary iron core of transformer, by the changes of magnetic field situation of the primary iron core of sensor transformer,
Produce alternating current impression signal.Rectification circuit is connected between induction coil and protection chip, for by alternating current impression signal rectification
It is direct current induced signal.Protection chip receives direct current induced signal, and when direct current induced signal exceeds preset value, protection chip is defeated
Go out power-off signal, disconnect the power supply of transmission line of electricity.Over-pressure safety device provided in an embodiment of the present invention, using induction coil to becoming
The primary iron core of depressor carries out electromagnetic induction, and using the size of current of the induction coil as overvoltage protection condition, therefore energy
Enough improve the sensitivity of circuit protection, more efficient protection transmission line of electricity, so as to improve the security of transmission line of electricity.
Other features and advantages of the present invention will be illustrated in the following description, also, the partly change from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages are in specification, claims
And specifically noted structure is realized and obtained in accompanying drawing.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art, below will be to specific
The accompanying drawing to be used needed for implementation method or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the over-pressure safety device that the embodiment of the present invention one is provided；
Fig. 2 is the schematic diagram of the over-pressure safety device that the embodiment of the present invention one is provided；
Fig. 3 is the schematic diagram of protection chip in the over-pressure safety device that the embodiment of the present invention one is provided；
Fig. 4 is the schematic diagram of the electric power system that the embodiment of the present invention two is provided.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Technical scheme be clearly and completely described, it is clear that described embodiment is a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
Current overvoltage protector is typically with the modes such as air switch or relay, to the electricity of the outlet line of civil power
Pressure is monitored.When the voltage of outlet line is excessive, using the mode such as air switch or relay disconnection, outlet line is cut off
Power supply, to realize the protection of circuit and electrical equipment.But, the sensitivity of existing overvoltage protector is relatively low, is occurring
Effectively circuit can not be protected during pressure.
Based on this, it is an object of the invention to provide a kind of over-pressure safety device and electric power system, can occur
Transmission line of electricity effectively is protected during pressure, the security of transmission line of electricity is improve.
Embodiment one：
The embodiment of the present invention provides a kind of over-pressure safety device, can be applied to the power supply scene such as family, office, factory.Such as
Shown in Fig. 1 and Fig. 2, the over-pressure safety device includes induction coil L1, rectification circuit and protection chip.
Wherein, induction coil is used to be wrapped in the secondary iron core of transformer, by the magnetic of the primary iron core of sensor transformer
Field situation of change, produces alternating current impression signal.Rectification circuit is connected between induction coil L1 and protection chip, for that will sense
The alternating current impression signal rectification that coil L1 is sensed is direct current induced signal.Protection chip receives direct current induced signal, works as direct current
When induced signal exceeds preset value, protection chip output power-off signal disconnects the power supply of transmission line of electricity.
Over-pressure safety device provided in an embodiment of the present invention, electricity is carried out using induction coil L1 to the primary iron core of transformer
Magnetic induction, and using the size of current of induction coil L1 as overvoltage protection condition, therefore, it is possible to provide the sensitive of circuit protection
Degree, more efficient protection transmission line of electricity, so as to improve the security of transmission line of electricity.
In the present embodiment, rectification circuit is realized in the form of rectifier bridge, rectifier bridge specifically by four diode D1, D2,
D3, D4 are constituted in the way of bridge-type is connected.By setting rectifier bridge, you can realize the alternating current impression sensed to induction coil L1
Signal carries out rectification, and shape is periodically direct current induced signal.
In over-pressure safety device provided in an embodiment of the present invention, also including being connected between rectification circuit and protection chip
Filter circuit.Filter circuit is made up of two filter capacitors C1, C2 and filter resistance R1, by filter capacitor C1, C2 and filter
Ripple resistance R1 is filtered to direct current induced signal, the voltage of direct current induced signal is limited within limits.
Additionally, the output end of filter circuit is also by connecting power end V+, V- of protection chip, for protection chip provides electricity
Source.
Further, in over-pressure safety device provided in an embodiment of the present invention, also including being connected to filter circuit with protection core
Amplifying circuit between piece.Amplifying circuit is mainly made up of the first variable resistor W1 and PNP type triode T1, direct current induced signal
By the amplification of triode T1, larger current signal can be generated, the current signal is by being converted to sensing after resistance R3
Voltage signal, and it is input into the first input end a1 of protection chip.The voltage-regulator diode D5 and electricity connected with the first variable resistor W1
Resistance R2, each serves as voltage stabilizing and the effect of current limliting.
Additionally, also including the second adjustable resistance W2 in the amplifying circuit, the second adjustable resistance W2 is used to for direct current to sense letter
Number be converted to reference voltage signal, the second input a2 of input protection chip.
In the present embodiment, the resistance of variable resistor W1, W2 can be adjusted between 0 to 5.1k Ω, variable resistor W1, W2 tool
The resistance of body can be when dispatching from the factory, and voltage, current conditions according to application scenarios are adjusted setting.
Protection chip is mainly monitored to the induced voltage signal that first input end a1 is received, and according to induced voltage
The change output power-off signal of signal.Meanwhile, the reference voltage signal that protection chip can also be received to the second input a2
It is monitored, power-off signal can also be exported when reference voltage signal occurs abnormal.
As shown in figure 3, specifically including comparing unit and trigger element in protection chip in the present embodiment.Comparing unit connects
Receive direct current induced signal (i.e. induced voltage signal and reference voltage signal), and by induced voltage signal and reference voltage signal with
Corresponding preset value is compared.When induced voltage signal exceeds corresponding preset value, or reference voltage signal exceeds phase
During corresponding preset value, trigger element will export power-off signal, disconnect the power supply of transmission line of electricity.
As a preferred scheme, multistable trigger is provided with trigger element, when direct current induced signal is beyond default
During value, multistable trigger output power-off signal.Multistable trigger is also referred to as n steady state triggers, is entering for bistable state tentaculum
One step develops.If n being input into for every one-level of amplifying stage has dc-couple and remaining output end at different levels between, certain
N stable state is can obtain under bar, and only has one-level to turn in each stable state, and remaining is turned off.In nonbinary meter
In number circuit, the quick response under various different conditions can be realized using polymorphic trigger, therefore than flip and flop generator
Response speed is faster.
By using with highly sensitive comparing unit and trigger element, and in trigger element in the embodiment of the present invention
Middle setting multistable trigger, enables protection chip to be responded within 0.1 second, so as to disconnect power supply electricity within the extremely short time
Source, effectively protection electrical equipment and supply line.
Over-pressure safety device provided in an embodiment of the present invention, electricity is carried out using induction coil L1 to the primary iron core of transformer
Magnetic induction, and using the size of current of induction coil L1 as overvoltage protection condition, therefore, it is possible to provide the sensitive of circuit protection
Degree, more efficient protection transmission line of electricity, so as to improve the security of transmission line of electricity.
Embodiment two：
As shown in figure 4, the embodiment of the present invention provides a kind of electric power system, including transformer TB and the institute of above-described embodiment one
The over-pressure safety device of offer.Wherein, the primary coil L3 connection power networks of transformer TB, secondary coil L2 connection exchange outputs
End, as ac output end, for electrical equipment provides AC power.Induction coil L1 in over-pressure safety device is wrapped in transformation
The secondary iron core of device.
In electric power system provided in an embodiment of the present invention, also including the first relay J1, the output end connection of chip is protected
The control end of the first relay J1.
Specifically, the protection chip in the present embodiment has two output ends b1, b2.Wherein, the first of protection chip is defeated
Go out to hold b1 that the control coil of the first relay J1 is connected by bidirectional triode thyristor BG；The second output end b2 of chip is protected by limit
Leakage resistance R4 is connected to the control end of bidirectional triode thyristor BG.
Controllable silicon BG is also referred to as IGCT (Silicon Controlled Rectifier, abbreviation SCR), with volume
The features such as small, structure is relatively easy, function is strong, is one of the more commonly used semiconductor devices.Controllable silicon BG in the present embodiment
It is bidirectional thyristor, bidirectional thyristor is a kind of device of bi directional conductibility as bilateral diode, and difference is many one
Control section, this just makes it with the working characteristics entirely different with diode.When the control end incoming level to bidirectional thyristor
During signal, negative electrode and anode can just be turned on.
Protect the level of the second output end b2 outputs of chip to transmit to the control end of bidirectional triode thyristor BG, make two-way controllable
The conducting of silicon BG.Meanwhile, protect chip the first output end b1 output level by bidirectional triode thyristor BG export to first after
The control coil of electrical equipment J1, disconnects the first relay J1 output ends, so as to realize the protection of supply line.
In addition, being also in series with resistance R5 and light-emitting diodes between the second output end b2 and bidirectional triode thyristor BG of protection chip
Pipe D6, when chip failure is protected, fault current can make light emitting diode D6 send alarm light, remind user to arrange in time
Except failure.
Further, electric power system provided in an embodiment of the present invention also includes the second relay J2.First relay J1's is defeated
Go out end to be connected with the control coil of the second relay J2, the output end of the second relay J2 is gone here and there with the primary coil L3 of transformer TB
Connection.
As a preferred scheme, when the first relay J1 is closed type relay, i.e. control coil no power first after
The output of electrical equipment J1 is in closure state.Meanwhile, when the second relay J2 is normal-open type relay, i.e. control coil no power
The output end of the first relay J1 is off.
In the case of electric power system normal power supply, the control coil no power of the first relay J1, the first relay J1
Output in closure state, therefore control power supply can be supplied by the first relay J1 to the control coil of the second relay J2
Electricity.The control coil of the second relay J2 in the case of energization, its output in closure state, to maintain transformer TB's
Primary coil L3 continued powers.Meanwhile, protect the first output end b1 and the second output end b2 of chip to be exported without level signal.
When the trigger element in protecting chip sends power-off signal, the control coil of the first relay J1 is powered, and makes the
The output end of one relay J1 disconnects.Due to the first relay J1 output end disconnect, therefore the second relay J2 control line
Circle power-off, disconnects the output end of the second relay J2, so that the connection of power network and the primary coil L3 of transformer TB is cut off, with
The power supply of electric power system is cut off, the protection of supply line is realized.
In the present embodiment, the first relay J1 uses closed type relay, the second relay J2 to use normal-open type relay
Have further the advantage that：In actual electric power system, can be in the output end of the first relay J1 with the second relay J2's
The relay of multiple difference purposes of being connected between control coil, such as the relay of relay, overvoltage protection for arc protection
Device, and for the relay of short-circuit protection.These relays also all use closed type relay, and each relay is defeated
Go out control coil of the end all with the second relay J2 connect, then wherein the disconnection of any one relay when, can make second after
The control coil power-off of electrical equipment J2, so as to cut off the power supply of power system.
The electric power system that the embodiment of the present invention two is provided, the over-pressure safety device provided with above-described embodiment one, with phase
Same technical characteristic, so can also solve identical technical problem, reaches identical technique effect.
In addition, in the description of the embodiment of the present invention, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can
Being to mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
Two connections of element internal.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", D score, "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outward " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify describe, rather than indicate imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
Additionally, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying phase
To importance.
Finally it should be noted that：Embodiment described above, specific embodiment only of the invention, is used to illustrate the present invention
Technical scheme, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those within the art that：Any one skilled in the art
The invention discloses technical scope in, it can still modify to the technical scheme described in previous embodiment or can be light
Change is readily conceivable that, or equivalent is carried out to which part technical characteristic；And these modifications, change or replacement, do not make
The essence of appropriate technical solution departs from the spirit and scope of embodiment of the present invention technical scheme, should all cover in protection of the invention
Within the scope of.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (10)
1. a kind of over-pressure safety device, it is characterised in that including induction coil, rectification circuit and protection chip；
The induction coil is used to be wrapped in the secondary iron core of transformer, and produces alternating current impression signal；
The rectification circuit is connected between the induction coil and the protection chip, and the rectification circuit feels the exchange
Induction signal rectification is direct current induced signal；
The protection chip receives the direct current induced signal, when the direct current induced signal exceeds preset value, the protection
Chip exports power-off signal.
2. over-pressure safety device according to claim 1, it is characterised in that the rectification circuit is rectifier bridge.
3. over-pressure safety device according to claim 1, it is characterised in that also including being connected to the rectification circuit and institute
State the filter circuit and amplifying circuit between protection chip.
4. over-pressure safety device according to claim 1, it is characterised in that the protection chip include comparing unit and
Trigger element；
The comparing unit receives the direct current induced signal, and the direct current induced signal and the preset value are compared
Compared with；
When the direct current induced signal exceeds preset value, the trigger element exports power-off signal.
5. over-pressure safety device according to claim 4, it is characterised in that multistable is provided with the trigger element and is touched
Hair device；
When the direct current induced signal exceeds preset value, the multistable trigger exports power-off signal.
6. a kind of electric power system, it is characterised in that the overvoltage guarantor including transformer and as described in any one of claim 1 to 5
Protection unit；
The primary coil connection power network of the transformer, secondary coil connection ac output end；
Induction coil in the over-pressure safety device is wrapped in the secondary iron core of transformer.
7. electric power system according to claim 6, it is characterised in that also including the first relay；
The output end of the protection chip connects the control end of first relay.
8. electric power system according to claim 7, it is characterised in that the first output end of the protection chip is by two-way
Controllable silicon connects the control coil of first relay；
Second output end of the protection chip connects the control end of the bidirectional triode thyristor by current-limiting resistance.
9. electric power system according to claim 8, it is characterised in that also including the second relay；
The output end of first relay is connected with the control coil of second relay, the output of second relay
Connected with the primary coil at end.
10. electric power system according to claim 9, it is characterised in that first relay is closed type relay, institute
The second relay is stated for normal-open type relay.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098492.6A CN106786354A (en) | 2017-02-22 | 2017-02-22 | Over-pressure safety device and electric power system |
| PCT/CN2017/091221 WO2018153000A1 (en) | 2017-02-22 | 2017-06-30 | Over-voltage protection apparatus and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098492.6A CN106786354A (en) | 2017-02-22 | 2017-02-22 | Over-pressure safety device and electric power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106786354A true CN106786354A (en) | 2017-05-31 |
Family
ID=58960011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710098492.6A Pending CN106786354A (en) | 2017-02-22 | 2017-02-22 | Over-pressure safety device and electric power system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106786354A (en) |
| WO (1) | WO2018153000A1 (en) |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018153000A1 (en) * | 2017-02-22 | 2018-08-30 | 中领世能（天津）科技有限公司 | Over-voltage protection apparatus and power supply system |
| CN107181240A (en) * | 2017-06-26 | 2017-09-19 | 中领世能（天津）科技有限公司 | Rectifier bridge protection circuit, over-pressure safety device and electric power system |
| CN111302147A (en) * | 2020-03-15 | 2020-06-19 | 河北源泷科技有限公司 | Wire box with line detection function |
| CN111302147B (en) * | 2020-03-15 | 2022-01-11 | 国网甘肃省电力公司超高压公司 | Wire box with line detection function |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018153000A1 (en) | 2018-08-30 |
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