CN206401884U - Surge protector and surge protection system - Google Patents
Surge protector and surge protection system Download PDFInfo
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- CN206401884U CN206401884U CN201621399211.8U CN201621399211U CN206401884U CN 206401884 U CN206401884 U CN 206401884U CN 201621399211 U CN201621399211 U CN 201621399211U CN 206401884 U CN206401884 U CN 206401884U
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Abstract
The utility model provides a kind of Surge Protector and surge protection system, and the Surge Protector also includes：Shunt trip is provided with switch module, transformer module and detection drive module, switch module, switch module is series at the front end of circuit residing for piezo-resistance group, and transformer module is connected with lightning-protection module；Detect drive module, it is connected respectively with switch module and transformer module, current signal for receiving transformer module senses, and exceed setting electric current threshold value in the size of current for detecting current signal, and the duration of current signal is when exceeding the time threshold of setting, driving shunt trip is to drive the switch module to disconnect the circuit.Can be when there is larger current and the duration is longer in Surge Protector of the present utility model and surge protection system; accurately and timely disconnect Surge Protector internal wiring; so as to improve the reliability and security of Surge Protector, and simple in construction, cost is low.
Description
Technical field
The utility model is related to carrying out surge protection technical field, more particularly to a kind of Surge Protector and surge protection system.
Background technology
Surge Protector is indispensable equipment in low-voltage distribution system.At present, in low-voltage distribution environment, votage limit type
Surge Protector is the most commonly used, and it uses the piezo-resistance with advantages such as response are fast, residual voltage is low, impact resistance is strong as lightning protection
Element.Simultaneously as piezo-resistance has the defects such as easily deteriorate, deterioration state is unstable, change in resistance is discontinuous so that in warp
After after thunderbolt several times or surge impact, piezo-resistance is deteriorated, and is produced leakage current and is generated heat simultaneously；Or when having power frequency short in circuit
During the electric current of road, piezo-resistance easily triggers the danger such as fire because of conducting heating.
Generally, prior art is solved the above problems by following two modes, and one is the installation base at piezo-resistance pin
The thermal release device of high temperature melt principle is run into solder, when piezo-resistance adstante febre, temperature reaches low temperature solder joint, solder
Melt the tripping mechanism action for be connected with solder joint, and then disjunction piezo-resistance path, make circuit out of danger；Two be in wave
Series circuit protection device (such as breaker or fuse) on path residing for surge protector, when occurring short circuit current flow in path,
Circuit protection device is acted to cut off path, makes circuit out of danger.
However, it is found by the inventors that there is following defect in the prior art：First, in above-mentioned first way, heat, which is threaded off, to be filled
The action put is based on response condition of the solder to temperature, and solder is easily affected by environment, and its fusing point is very unstable；Simultaneously
Constrained, easily occurred because solder adhesion, wire drawing cause the phenomenon that tripping mechanism takes off not open by welding procedure；Secondly, above-mentioned second
In mode, by taking breaker as an example, breaker needs satisfaction to be failure to actuate temporarily in the impact of lightning current or surge current (kA grades),
In power frequency short circuit current flow, (A grades) are carried out the interim requirement acted at once.Because the contact mechanism of circuit breaker internal is in powerful surge
Electric current can be because Lorentz force reprimand be held when flowing through, therefore the requirement is difficult to meet；Further, since piezo-resistance deterioration state is unstable
It is fixed so that the short circuit current flow in circuit is from several amperes to hundreds of amperes, and circuit protection device is difficult in any short circuit current flow
Value can be acted accurately and timely when passing through so that the reliability and security of Surge Protector are relatively low.
Utility model content
The purpose of the utility model embodiment is there is provided a kind of Surge Protector and surge protection system, to realize
When there is larger current and longer duration, Surge Protector internal wiring is accurately and timely disconnected, so as to improve surge
The reliability and security of protector, and simple in construction, cost is low.
To realize above-mentioned utility model purpose, embodiment of the present utility model provides a kind of Surge Protector, including anti-
Thunder module, the lightning-protection module includes the piezo-resistance group being made up of multiple piezo-resistances, and the Surge Protector also includes：Open
Close and be provided with shunt trip, the switch module on module, transformer module and detection drive module, the switch module
The front end of circuit residing for the piezo-resistance group is series at, the transformer module is connected with the lightning-protection module；The inspection
Drive module is surveyed, is connected respectively with the switch module and the transformer module, for receiving the transformer module sense
The current signal of survey, and exceed setting electric current threshold value in the size of current for detecting the current signal, and the electric current is believed
Number duration when exceeding the time threshold of setting, driving shunt trip is to drive the switch module to disconnect the line
Road.
Preferably, the switch module includes multiple switch, the quantity phase of the quantity of the switch and the piezo-resistance
Together, and connect one to one.
Preferably, the shunt trip includes a shunt release being connected with the detection drive module.
Preferably, the transformer module includes a current sensor being connected with the detection drive module, institute
State current sensor and connect the lightning-protection module by PE terminals.
Preferably, the shunt trip includes the multiple shunted exciter trippings being connected respectively with the detection drive module
Device, the quantity of the shunt release is identical with the quantity of the switch, and corresponds setting.
Preferably, the transformer module includes the multiple current senses being connected respectively with the detection drive module
Device, the quantity of the current sensor is identical with the quantity of the piezo-resistance, and corresponds setting, and the multiple electric current is passed
Sensor is connected between corresponding piezo-resistance and PE terminals.
Preferably, the detection drive module includes detection unit, arithmetic element, memory cell, driver element and communication
Unit；
The detection unit, is connected with the arithmetic element, and the electric current for receiving the transformer module senses is believed
Number, and detect size of current and the duration of the current signal, and by the size of current detected and it is lasting when
Between send to the arithmetic element；
The arithmetic element, is connected with the memory cell and the driver element respectively, for according to the electric current
Size and duration determine current type, when it is determined that current type be lightning current or surge current when, will be used to characterize electricity
Stream type is that the first information of lightning current or surge current is sent to memory cell, or, when it is determined that current type be electric leakage
When stream or power frequency short circuit current flow, it will be sent for characterizing current type for the second information of leakage current or power frequency short circuit current flow to institute
State driver element；
The memory cell, for recording number of lightning strokes and/or surge impact number of times；
The driver element, for driving shunt trip；
The communication unit, is connected, sending is used for the arithmetic element, the memory cell and driver element respectively
Characterize and occur the message of at least one of lightning current, surge current, leakage current and power frequency short circuit current flow event to monitoring host computer；
And/or, the number of lightning strokes recorded and surge impact number of times are sent to the monitoring host computer；And/or, receive the monitoring host computer hair
The instruction for being used to indicate driving shunt trip action sent.
Embodiment of the present utility model additionally provides a kind of surge protection system, including at least one is such as previous embodiment institute
Surge Protector, data acquisition device and the monitoring host computer stated, the Surge Protector and the monitoring host computer respectively with it is described
Data acquisition device is communicated to connect.
Surge Protector and surge protection system that the utility model embodiment is provided, pass through the electricity of transformer module senses
Flow signal, detection drive module detects size of current and the duration of the current signal, size of current and duration all
During more than corresponding threshold value, driving shunt trip to drive switch module to act, it is achieved thereby that can occur compared with
When high current and longer duration, Surge Protector internal wiring is accurately and timely disconnected, so as to improve Surge Protector
Reliability and security, and simple in construction, cost is low.
Brief description of the drawings
Fig. 1 is the structural representation of the Surge Protector of the utility model embodiment one；For convenience of understanding, shown in figure
Phase terminal, neutral conductor terminals；
Fig. 2 for the utility model embodiment one Surge Protector in detect drive module structured flowchart；
Fig. 3 is the structural representation of the Surge Protector of the utility model embodiment two；For convenience of understanding, shown in figure
Phase terminal, neutral conductor terminals, PE terminals；
Fig. 4 is the structural representation of the Surge Protector of the utility model embodiment three；For convenience of understanding, shown in figure
Phase terminal, neutral conductor terminals, PE terminals；
Fig. 5 is the structured flowchart of the surge protection system of the utility model example IV.
Embodiment
The utility model embodiment Surge Protector and surge protection system are described in detail below in conjunction with the accompanying drawings.
Embodiment one
Fig. 1 is the structural representation of the Surge Protector of the utility model embodiment one, reference picture 1, Surge Protector bag
Include lightning-protection module 110, switch module 120, transformer module 130 and detection drive module 140.Wherein, lightning-protection module include by
The piezo-resistance group 111 that multiple piezo-resistances are constituted.Shunt trip 150, switch module are provided with switch module 120
120 are series at the front end of circuit residing for piezo-resistance group 111, and transformer module 130 is connected with lightning-protection module 110；Detection is driven
Dynamic model block 140 is connected with switch module 120 and transformer module 130 respectively, the electricity for receiving the sensing of transformer module 130
Signal is flowed, and exceedes setting electric current threshold value in the size of current for detecting current signal, and the duration of current signal surpasses
When crossing the time threshold of setting, shunt trip 150 is driven to drive the open-circuit line of switch module 120.
In actual applications, that is, in switching molding of the front end series connection with shunt trip 150 of piezo-resistance group 111
Block 120, installs transformer module 130, and detection drive module 140 is connected with transformer module 130 on ground wire.Mutual inductance
Device module 130 detects the current situation into ground, for example, when size of current exceedes milliampere (mA) level, while the duration exceedes milli
During second (ms) level, the detection driving shunt trip 150 of drive module 140 so that switch module 120 disconnects, so as to cut off electricity
Road.Thus, whether leakage current or power frequency short circuit current flow, as long as exceeding predetermined current threshold value and duration threshold simultaneously
Value, detection drive module 140 will drive shunt trip 150 to drive switch module 120 to act.In addition, being illustrated in Fig. 1
The piezo-resistance group of 4 piezo-resistance compositions, but not limited to this, the application are not specifically limited to the quantity of piezo-resistance.
Wherein, lightning-protection module 110 may particularly include set on shell, shell with phase line (L1, L2 as shown in Figure 1 and
L3), the neutral conductor (N as shown in Figure 1), the connection terminal of ground wire, are internally provided with piezo-resistance, while inside can fill filling
Envelope material so that lightning-protection module has the characteristics such as protection against the tide, anticorrosion, can normally use in any environment.Thus, lightning-protection module is only
The binding post set in shell, inserts and piezo-resistance, and shell is constituted, so can be real with simplest structure
Existing lightning protection function, while the production cost of lightning-protection module can also be reduced.
Fig. 2 for the utility model embodiment one Surge Protector in detect drive module structured flowchart, reference picture 2,
Further, detection drive module 140 may particularly include detection unit 210, arithmetic element 220, memory cell 230, driving list
Member 240 and communication unit 250.
Detection unit 210 is connected with arithmetic element 220, the current signal for receiving the sensing of transformer module 130, and
The size of current of sensed current signal and duration, and the size of current detected and duration are sent to computing list
Member 220.
Arithmetic element 220 is connected with memory cell 230 and driver element 240 respectively, for according to size of current and holding
The continuous time determines current type, when it is determined that current type be lightning current or surge current when, will be used to characterize current type be
The first information of lightning current or surge current is sent to memory cell 230, or, when it is determined that current type be leakage current or work
During frequency short circuit current flow, it will be sent for characterizing current type for the second information of leakage current or power frequency short circuit current flow to driver element
240。
Memory cell 230 is used to record number of lightning strokes and/or surge impact number of times.
Driver element 240 is used to drive shunt trip.
Communication unit 250 is connected with arithmetic element 220, memory cell 230 and driver element 240 respectively, and sending is used for
Characterize and occur the message of at least one of lightning current, surge current, leakage current and power frequency short circuit current flow event to monitoring host computer；
And/or, the number of lightning strokes recorded and surge impact number of times are sent to monitoring host computer；And/or, receive being used for for monitoring host computer transmission
Indicate the instruction of driving shunt trip action.
Thus, it is possible to both ensure that thunderbolt or surge current are normally released, leakage current or power frequency short circuit electricity can occur again
Timely disjunction during stream.Assuming that now although the current value of lightning current or surge current is very big, the duration is s grades of μ, it is clear that no
Condition of the duration more than threshold value is met, driver element 240 will not then drive shunt trip 150 to drive switch module
120 actions, it is ensured that lightning current or surge are normally released.In addition, can also include for its power supply inside detection drive module 140
Power supply.
In system application, communication unit 250 is connected with arithmetic element 220, can will be seen that lightning current (or surge current)
Or the event of leakage current (or power frequency short circuit current flow), monitoring host computer is informed by data acquisition unit.Communication unit 250 is single with storage
Member 230 is connected, the thunder for being easy to monitoring host computer to be recorded by data acquisition unit connection communication unit 250, inquiry memory cell 230
Hit the data of number of times and/or surge impact number of times.Communication unit 250 is connected with driver element 240, thus, and monitoring host computer can lead to
Data acquisition unit connection communication unit 250 is crossed, sends and instructs to driver element 240, so that shunt trip 150 is acted.
The Surge Protector that the utility model embodiment is provided, by the current signal of transformer module senses, detection is driven
Dynamic model block detects size of current and the duration of the current signal, and corresponding thresholding is above in size of current and duration
During value, driving shunt trip to drive switch module to act, it is achieved thereby that can there is larger current and it is lasting when
Between it is longer when, accurately and timely disconnect Surge Protector internal wiring, so as to improve the reliability and safety of Surge Protector
Property, and simple in construction, cost is low.
In addition, the present embodiment also has the effect that：By detecting the detection unit in drive module, driver element, fortune
Calculate unit, communication unit and memory cell to cooperate, size of current that can be in the current signal received and duration
Above corresponding threshold value when, driving shunt trip to drive switch module to act, while can also store thunderbolt time
Number.
Embodiment two
Fig. 3 is the structural representation of the Surge Protector of the utility model embodiment two.It can be considered that Fig. 1 shown devices are implemented
A kind of specific implementation of example, reference picture 3, compared to the apparatus structure of Fig. 1 shown device embodiments, shows switch in Fig. 3
The concrete structure of module 120, the concrete structure of shunt trip 150 and the concrete structure of transformer module 130.
Specifically, switch module 120 may include multiple switch 310, the quantity phase of the quantity and piezo-resistance of switch 310
Together, and connect one to one.
Further, shunt trip 150 may include a shunt release being connected with detection drive module 140
320。
In concrete implementation mode, the switch 310 in switch module 120, which can be that simple switch structure is i.e. purely mechanic, to be opened
Close, shunt release 320 can use purely mechanic linkage, without any electromagnetic component, so as to ensureing to lightning current or
The impact resistance of surge current, and the resistance very little of switch itself, it is ensured that residual voltage is very low when through-flow.In addition, in actual applications,
Arc-control device is may also include in switch module 120, not starting the arc when ensureing switch motion with this.
Further, transformer module 130 may include a current sensor being connected with detection drive module 140
330, current sensor 330 connects lightning-protection module 110 by PE terminals.
The present embodiment is by taking three-phase Surge Protector as an example, and L1, L2, L3 shown in Fig. 3 are phase line, and N is the neutral conductor, and PE is to connect
Ground wire.Current sensor 330 is arranged on total ground wire, detects total current signal.When detection drive module 140 detects electricity
When the total size of current over the ground and duration that flow sensor 330 is sensed exceed threshold value simultaneously, the band of shunt release 320 is driven
Multiple switch 310 is acted in dynamic switch module, disconnect multiple piezo-resistances each residing for circuit so that lightning-protection module 110 is complete
Portion is disengaged.Thus, can integral replacing lightning-protection module when safeguarding.
The Surge Protector that the utility model embodiment is provided, it is accurate by the current sensor on total ground wire
Really, total current signal is rapidly sensed, total electric current letter is detected in the detection drive module being connected with current sensor
Number size of current and the duration simultaneously more than threshold value when, driving shunt release drive switch module in multiple switch move
Make, disconnect multiple piezo-resistances each residing circuit, so that lightning-protection module all disengagements, so as to improve surge protection
The reliability and security of device, and simple in construction, cost is low.In addition, switch module is made up of simple switch, and shunt opening is set to take off
Device is detained, cost is reduce further, improves reliability.
Embodiment three
Fig. 4 is the structural representation of the Surge Protector of the utility model embodiment three.It can be considered that Fig. 1 shown devices are implemented
Example another specific implementation, reference picture 4, compared to the apparatus structure of Fig. 3 shown device embodiments, shown in Fig. 4 with
The concrete structure of shunt trips 150 different Fig. 3 and the concrete structure of transformer module 130.
Specifically, shunt trip 150 includes the multiple shunt releases being connected respectively with detection drive module 140
320, the quantity of shunt release 320 is identical with the quantity of switch 310, and corresponds setting.
Further, transformer module 130 includes the multiple current sensors being connected respectively with detection drive module 140
330, the quantity of current sensor 330 is identical with the quantity of piezo-resistance, and corresponds setting, multiple current sensors 330
It is connected between corresponding piezo-resistance and PE terminals.
That is, the switch 310 on per road is each provided with a shunt release 320, detection drive module 140 is distinguished
It is connected with four shunt releases 320, while being both provided with the current sensor 330 on current sensor 330, each road on per road
Current conditions belonging to only detecting on circuit.
In actual applications, the lightning-protection module 110 in the present embodiment is segmented into four in dotted line frame as shown in Figure 4
Independent submodule, is no longer an entirety, and the submodule in corresponding line is only changed when switching 310 and acting, without
All change.
The Surge Protector that the utility model embodiment is provided, has by the switch residing for every piezo-resistance on circuit
A standby shunt release, while being designed with current sensor on every circuit, the current sensor on each bar circuit is only detected
Current conditions on this circuit, multiple current sensors are connected with detection drive module respectively, detect drive module again respectively
Be connected with multiple shunt releases, size of current so as to the current signal of separately detect every circuit and it is lasting when
Between, meanwhile, when larger current and longer duration occur in certain circuit or a few circuits, accurately and timely disconnect phase
The circuit answered.Compared with previous embodiment two, possess the Surge Protector of this structure so that surge protection operation it is more flexible,
All circuits need not be disconnected, it is to avoid the unnecessary wasting of resources.
Example IV
Fig. 5 is the structured flowchart of the surge protection system of the utility model example IV, and surge protection system includes main prison
Control station 540, at least one sub- monitoring station 530, at least one data acquisition device 520 and at least one such as previous embodiment one,
Any one of Surge Protector 510 in embodiment two and embodiment three.At least one sub- monitoring station 530 and main monitoring station
540 communication connections, at least one data acquisition device 520 is communicated to connect with least one corresponding sub- monitoring station 530, and at least one
Individual Surge Protector 510 is connected with least one corresponding data acquisition device communication 520.
In concrete implementation mode, a monitoring host computer, and every sub- monitoring station 530 are set in main monitoring station 540
One monitoring host computer is also all set.In addition, in actual applications, sub- monitoring station can also be connected by network equipments such as interchangers
Many data acquisition devices, so as to which in so huge application environment, the wave of more is reasonably managed in subregional
Surge protector.
Detection drive module in Surge Protector 510 is connected with data acquisition device 520, data acquisition device 520
It is connected by sub- monitoring station 530 with the monitoring host computer of main monitoring station 540.When detection drive module driving shunt release action
When, data message for reporting dropout event can be sent to data acquisition device 520, for example, using on-off model (0 or
1) as data message, default " 1 " represents and there occurs dropout event.When the monitoring host computer of main monitoring station 540 receives " 1 " i.e.
Accident can be found.Meanwhile, the storage number of lightning strokes of Surge Protector 510, and record thunderbolt event, therefore the prison of main monitoring station 540
Control main frame can also inquire about thunderbolt correlation circumstance.In addition, the monitoring host computer of main monitoring station 540 can also be at any time to one or many
Individual Surge Protector 510 sends order to control shunt trip to drive switch module action breaking inner circuit.Per height
Monitoring station 530 can check the information of multiple Surge Protectors 510 of corresponding connection, and to this multiple Surge Protector
510 carry out switch control.
The surge protection system that the utility model embodiment is provided, passes through main monitoring station, sub- monitoring station, data acquisition device
The system architecture constituted with Surge Protector and the communication connection set up each other, realize and easily and quickly collect surge
The number of lightning strokes of protector storage and the thunderbolt time of record, the security of data transfer is higher.In addition, can also be by the number of collection
According to being transferred to main monitoring station.Meanwhile, main monitoring station actively can also send to control to some or certain several Surge Protectors
Shunt trip drives the order of switch module action.So as to which the management analyzed for big data with Surge Protector provides convenient
Channel.
It is described above, embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model is disclosed
Or replace, it should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with the power
The protection domain that profit is required is defined.
Claims (10)
1. a kind of Surge Protector, including lightning-protection module, the lightning-protection module include the pressure-sensitive electricity being made up of multiple piezo-resistances
Resistance group, it is characterised in that the Surge Protector also includes：Switch module, transformer module and detection drive module, it is described to open
Close and be provided with shunt trip in module, the switch module is series at the front end of circuit residing for the piezo-resistance group, institute
Transformer module is stated with the lightning-protection module to be connected；
The detection drive module, is connected with the switch module and the transformer module respectively, described mutual for receiving
The current signal of sensor module sensing, and exceed setting electric current threshold value in the size of current for detecting the current signal, and
When the duration of the current signal exceedes the time threshold of setting, shunt trip is driven to drive the switch module
Disconnect the circuit.
2. Surge Protector according to claim 1, it is characterised in that the switch module includes multiple switch, described
The quantity of switch is identical with the quantity of the piezo-resistance, and connects one to one.
3. Surge Protector according to claim 2, it is characterised in that the shunt trip includes and the detection
The shunt release that drive module is connected.
4. Surge Protector according to claim 3, it is characterised in that the transformer module includes driving with the detection
The current sensor that dynamic model block is connected, the current sensor connects the lightning-protection module by PE terminals.
5. Surge Protector according to claim 2, it is characterised in that the shunt trip include respectively with it is described
Multiple shunt releases that detection drive module is connected, the quantity of the shunt release is identical with the quantity of the switch,
And correspond setting.
6. Surge Protector according to claim 5, it is characterised in that the transformer module include respectively with the inspection
Survey multiple current sensors that drive module is connected, the quantity phase of the quantity of the current sensor and the piezo-resistance
Together, and correspond and set, the multiple current sensor is connected between corresponding piezo-resistance and PE terminals.
7. Surge Protector according to claim 2, it is characterised in that the switch is mechanical switch.
8. the Surge Protector according to claim 3 or 5, it is characterised in that the shunt release fills for mechanical linkage
Put.
9. according to Surge Protector according to any one of claims 1 to 7, it is characterised in that the detection drive module bag
Include detection unit, arithmetic element, memory cell, driver element and communication unit；
The detection unit, is connected with the arithmetic element, the current signal for receiving the transformer module senses, and
Size of current and the duration of the current signal are detected, and the size of current detected and duration are sent
To the arithmetic element；
The arithmetic element, is connected with the memory cell and the driver element respectively, for according to the size of current
Determine current type with the duration, when it is determined that current type be lightning current or surge current when, will be used to characterize current capacity
Type is that the first information of lightning current or surge current is sent to memory cell, or, when it is determined that current type for leakage current or
During power frequency short circuit current flow, it will be sent for characterizing current type for the second information of leakage current or power frequency short circuit current flow to the drive
Moving cell；
The memory cell, for recording number of lightning strokes and/or surge impact number of times；
The driver element, for driving shunt trip；
The communication unit, is connected with the arithmetic element, the memory cell and driver element respectively, sends for characterizing
Occurs the message of at least one of lightning current, surge current, leakage current and power frequency short circuit current flow event to monitoring host computer；And/or,
The number of lightning strokes recorded and surge impact number of times are sent to the monitoring host computer；And/or, receive the use that the monitoring host computer is sent
In the instruction for indicating driving shunt trip action.
10. a kind of surge protection system, it is characterised in that including main monitoring station, at least one sub- monitoring station, at least one data
Harvester and at least one such as Surge Protector according to any one of claims 1 to 9, at least one described sub- monitoring station
Communicated to connect with the main monitoring station, at least one described data acquisition device leads to at least one corresponding described sub- monitoring station
Letter connection, at least one described Surge Protector is communicated to connect with least one corresponding described data acquisition device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621399211.8U CN206401884U (en) | 2016-12-19 | 2016-12-19 | Surge protector and surge protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621399211.8U CN206401884U (en) | 2016-12-19 | 2016-12-19 | Surge protector and surge protection system |
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| Publication Number | Publication Date |
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| CN206401884U true CN206401884U (en) | 2017-08-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895933A (en) * | 2017-12-06 | 2018-04-10 | 云南电网有限责任公司玉溪供电局 | The voltage transformer overvoltage protection suppressed using resistance sampling resistance |
-
2016
- 2016-12-19 CN CN201621399211.8U patent/CN206401884U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895933A (en) * | 2017-12-06 | 2018-04-10 | 云南电网有限责任公司玉溪供电局 | The voltage transformer overvoltage protection suppressed using resistance sampling resistance |
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