CN208013377U - Low-voltage circuit breaker voltage monitoring and voltage protection - Google Patents
Low-voltage circuit breaker voltage monitoring and voltage protection Download PDFInfo
- Publication number
- CN208013377U CN208013377U CN201820339494.XU CN201820339494U CN208013377U CN 208013377 U CN208013377 U CN 208013377U CN 201820339494 U CN201820339494 U CN 201820339494U CN 208013377 U CN208013377 U CN 208013377U
- Authority
- CN
- China
- Prior art keywords
- voltage
- low
- circuit breaker
- module
- analog
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
- 238000004891 communication Methods 0.000 claims abstract description 34
- 238000013459 approach Methods 0.000 claims description 7
- 230000004075 alteration Effects 0.000 abstract description 11
- 230000005611 electricity Effects 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000588769 Proteus <enterobacteria> Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
Low-voltage circuit breaker voltage monitoring and voltage protection, including：First voltage changing module, the second Transformer Rectifier module, analog-digital converter, analysis controlling unit, Interface for digital communication module and alarm module；First voltage changing module is connect with analog-digital converter；Analysis controlling unit is connect with analog-digital converter, and the voltage signal of input is converted into digital signal and is output to analysis controlling unit by analog-digital converter；Analysis controlling unit is connect with Interface for digital communication module, alarm module；Second Transformer Rectifier module is used to the alternating voltage of input being converted into DC voltage, is analog-digital converter, analysis controlling unit and digital communication interface modules power supply；Device is connect with low-voltage circuit breaker.The utility model realizes the monitoring to supply voltage deviation and voltage harmonic aberration rate and realizes voltage protection, avoids the influence that voltage deviation is larger or harmonic voltage transfinites to user equipment normal operation and service life.
Description
Technical field
The utility model is related to low-voltage distribution fields more particularly to low-voltage circuit breaker voltage monitoring to be filled with voltage protection
It sets.
Background technology
Previous《Power supply and business rules》Regulation：" as defined in power supply enterprise when peak load of grid：100kVA or more
The user power factor of high voltage supply is 0.90 or more, otherwise should increase the reactive power compensator (power industry promulgated in 1996
The 8th command of portion, the State Council Decree the 196th that 2016 promulgate of having changed one's profession《Regulations of electric power supply and use》).Therefore, distribution
End is configured with the reactive-load compensation equipments such as a large amount of shunt capacitors.Meanwhile and since power supply enterprise carries out " two to industrial user etc.
Portion's electricity charge system "：(1) basic charge as per installed capacity monthly presses filled main transformer capacity (kVA) charging paying fee；(2) the electric energy electricity charge, it is electric by monthly consuming
Energy (kWh) calculates the electricity charge, and multiplies a regulation coefficient according to the height of monthly average power factor.All monthly average power factors are higher than
Specified value, certain electricity charge can be paid less.Ministry of Water Resources and Electric Power, State Bureau of Commodity Prices's file --- (83) water power wealth word the 215th《Power
Factor adjusts electricity charge method》Allow, by user monthly practical active energy and capacity of idle power, to calculate monthly average power factor.Cause
This, the shunt capacitor of considerable industrial and mining enterprises' configuration often traditionally can all be put into operation by long-term.Further, since land used is tight
It opens and the factors urban distribution networks such as safe beauty uses a large amount of cable run, and cable run direct-to-ground capacitance is larger, all
Such as the late into the night at light load, can cause reactive power superfluous and make the voltage level of distribution end higher.
On the other hand, since environment in recent years and energy security problem increasingly attract attention, in national legislation policy
Under promotion, the renewable energy power generation application of user side just gradually quickly increases.Since original distribution is planned and is run not
In view of a kind of this situation, when therefore, in distribution largely accessing renewable energy power generation, by previous unilateral side electricity when matching network operation
Source power grid becomes more power generating facilities and power grids, and since generated output of renewable energy source variation randomness is larger and need to use power electronics
It is grid-connected after the rectified inversion of device, may to the power quality of distribution, power supply reliability, relay protection configuration and adjust
Bring a series of influences, original control measure with network operation can may not play its due effectiveness.
Currently, electric energy quality monitoring and control are concentrated mainly on power grid supply side, if by current electric energy quality monitoring side
When case is applied to user side, investment is excessively high, while the electric energy quality monitoring of multi objective, high-precision, large capacity is for general user
For also without practical significance.For low-voltage customer, influence its power quality principal element be supply voltage deviation and
Harmonic voltage is more than permissible value.The normal operation of user equipment can be influenced when voltage deviation is larger or harmonic voltage transfinites and is made
With the service life, power supply system internal fault causes supply voltage to increase and leads to case that wide range of users electrical equipment damages also repeatly
See not fresh.And be widely used in being integrated in the miniature circuit breaker of low-voltage distribution system terminal short-circuit protection, overload protection with
And earth leakage protective etc., but consider that voltage is higher or relatively low and the case where when harmonic voltage transfinites.
Utility model content
The purpose of this utility model is to provide low-voltage circuit breaker voltage monitoring and voltage protection.Therefore, this practicality
It is novel to use following technical scheme.
Low-voltage circuit breaker voltage monitoring and voltage protection, described device include：First voltage changing module, the second transformation
Rectification module, analog-digital converter, analysis controlling unit, Interface for digital communication module and alarm module；
First voltage changing module is connect with the analog-digital converter, and first voltage changing module is by the alternating voltage of input
Be converted to the voltage signal for being suitble to be input to the analog-digital converter；
The analysis controlling unit is connect with the analog-digital converter, and the analog-digital converter turns the voltage signal of input
It changes digital signal into and is output to the analysis controlling unit；
The analysis controlling unit is connect with the Interface for digital communication module, the alarm module；
The second Transformer Rectifier module is used to the alternating voltage of input being converted into DC voltage, is the analog-to-digital conversion
Device, the analysis controlling unit and the Interface for digital communication module for power supply；
Described device is connect with low-voltage circuit breaker.
Preferably, first voltage changing module includes voltage transformer, voltage magnitude attenuator circuit and DC potential biasing
Circuit.
Preferably, the second Transformer Rectifier module includes transformer, rectification circuit and regulator circuit.
Preferably, the Interface for digital communication module is connect with low-voltage circuit breaker.
Preferably, described device further includes voltage protection control module, the voltage protection control module and low pressure open circuit
Device connects.
Preferably, the voltage protection control module include output driving amplifying circuit, intermediate relay and with it is described in
Between the corresponding intermediate relay contact of relay, the breaking coil of the intermediate relay contact and low-voltage circuit breaker connects.
Preferably, the Interface for digital communication module is RS232 communication interface modules or RS485 communication interface modules.
Preferably, the alarm module is sound-light alarm.
Preferably, the connection of the Interface for digital communication module and the low-voltage circuit breaker for supporting digital control approach is wired
Connection is wirelessly connected.
Preferably, described device further includes button and display screen, the button and display screen and the analysis controlling unit
Connection.
The utility model has the beneficial effects that：The utility model design provides digital low-voltage circuit breaker voltage monitoring
With voltage protection, realizes the monitoring to supply voltage deviation and voltage harmonic aberration rate and realize voltage protection, avoid
The influence to user equipment normal operation and service life that voltage deviation is larger or harmonic voltage transfinites.In addition, the utility model
Rectifying and voltage-stabilizing input circuit and the voltage signal circuit to be measured of device respectively use one group of transformer, inputted to avoid rectifying and voltage-stabilizing
Interference of the circuit to voltage signal to be measured.
Description of the drawings
Fig. 1 is the low-voltage circuit breaker voltage monitoring of the utility model and the structure chart of voltage protection.
Fig. 2 is the low-voltage circuit breaker voltage monitoring and voltage protection of the support digital control approach of the utility model
Structure chart.
Fig. 3 is the low-voltage circuit breaker voltage monitoring with voltage protection control module and voltage protection of the utility model
The structure chart of device.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Low-voltage circuit breaker voltage monitoring and voltage protection, including：First voltage changing module, the second Transformer Rectifier mould
Block, analog-digital converter, analysis controlling unit, Interface for digital communication module, alarm module and voltage protection control module；First becomes
Die block is connect with analog-digital converter, and the first voltage changing module, which is converted to the alternating voltage of input, to be suitble to be input to analog-digital converter
Voltage signal；Analysis controlling unit is connect with analog-digital converter, and analysis controlling unit can be that microcontroller can also be MCU,
The voltage signal of input is converted into digital signal and is output to analysis controlling unit by analog-digital converter, and analysis controlling unit calculates
Voltage deviation and voltage harmonic aberration rate；Analysis controlling unit and Interface for digital communication module, alarm module and voltage protection control
Molding block connects, and Interface for digital communication module is connect with the low-voltage circuit breaker of digital control approach is supported；Second Transformer Rectifier mould
Block is used to the alternating voltage of input being converted into DC voltage, is analog-digital converter, analysis controlling unit, Interface for digital communication mould
Block and the power supply of voltage protection control module.
The utility model is described in detail below.
Voltage deviation is also known as variation, and for power grid, supply voltage deviation refers to actual motion voltage to system mark
The deviation relative value for claiming voltage, is expressed as a percentage；For electrical equipment, voltage deviation refers to the end electricity of given instant equipment
Press U and equipment rated voltage UNDifference to the percentage value of rated voltage, i.e.,：
According to GB/T 12325-2008《Power quality supply voltage deviation》Regulation, 20kV and following three phase supply electricity
Pressure deviation is that ± 7%, the 220V single phase power supplies voltage deviation of nominal voltage is+the 7% of nominal voltage, -10%, special circumstances
User is determined by confession, electricity consumption bilateral agreement.
It is counted with reference to the measurement method of power grid supply voltage deviation, that is, when obtaining the basic measurement of voltage effective value
Between window should be 10 cycles, and each time of measuring window should be not be overlapped with adjacent time of measuring window, continuous to measure
And the average value of voltage effective value is calculated, it calculates and obtains supply voltage deviation.
Voltage harmonic aberration rate passes through voltage total harmonic distortion factor THDV, voltage regulation h subharmonic containing ratios HRVhIndex degree
Amount：
Subscript h in formula indicates overtone order, is above designated as the 1 expression parameter as fundamental wave amount.
GB/T 14549-93《Power quality utility network harmonic wave》Index related with harmonic voltage is as shown in the table：
1 voltage harmonic aberration rate limit value of table
As shown in Figure 1 to Figure 3, supply voltage converts to obtain (the i.e. input friendship of 0~5V ac voltage signals through voltage transformer
Flow back to road)；The voltage is via R1、R2、R3The passive attenuation circuit of composition carries out the range of decrease, along with based on reference voltage source
(TL431) direct current biasing, to ensure the voltage signal of input a/d converter between 0~+5V, A/D converter passes through sampling
Analog voltage signal is converted into digital signal (i.e. A/D sample conversions circuit) and is output to microcontroller or MCU, microcontroller by calculating
Or therefore MCU obtains discrete voltage data (microcontroller that included A/D conversion functions can also be used), then it is real based on fft algorithm
The now extraction to power frequency and related subharmonic voltage (2~25 subharmonic voltage) and voltage deviation and voltage harmonic aberration rate
It calculates.Fft algorithm is realized by microcontroller or MCU.It is (such as ± 20%) or electric when the voltage deviation of calculating is more than preset value
Pressure percent harmonic distortion is when transfiniting, and microcontroller or MCU can change the state (setting to 0) of corresponding pin, to start the report being connected
Alert module or/and voltage protection control module, to send out sound-light alarm prompt or/and carry out corresponding tripping control output.Number
RS232 Interface for digital communication or RS485 Interface for digital communication may be used in word communication interface, RS232 or RS485 digital communications connect
The transmittable digital controlled signal of mouth, uploads (the reserved communication interfaces that also can be used as intelligent control) such as data, can supervise voltage
Optionally upload.When communication interface uses MAX485 chips or MAX232 chips, RS485 or RS232 communications can be respectively constituted and connect
Mouthful.The DC power supply of device is obtained by full-wave rectification and plus 7805 regulator circuits, is A/D converter, MCU and digital communication
Mouth provides DC power supply, and for the interference for avoiding to voltage signal to be measured, rectifying and voltage-stabilizing input circuit is using another power supply transformation
Device (i.e. the rectifying and voltage-stabilizing circuit of supply voltage).
Can realize whether to allow voltage alarm by button, tripping setting, voltage alarm, trip threshold setting value are set
It sets, the releasing of voltage alarm and tripping control signal, if allow to send electricity by RS232 or RS485 digital communication mouths
Pressure alarm, tripping control signal, if allow rate of qualified voltage, highest/minimum through RS232 or RS485 digital communications mouth
The data such as voltage, voltage harmonic aberration rate upload etc.；Liquid crystal display can show that current voltage value and voltage deviation value, voltage harmonic are abnormal
Highest/minimum voltage value before variability, signal relief and voltage harmonic aberration rate, if allow alarm, tripping facilities, electricity
Pressure alarm, trip threshold setting value；When allowing alarm setting, when voltage deviation and/or voltage harmonic aberration rate are more than permissible value,
It is prompted by sound-light alarm；When tripping being allowed to be arranged, it can be allowed according to electrical equipment operating voltage and/or voltage harmonic aberration rate
Range setting tripping control threshold (such as 1.2UNDeng).
Microcontroller pin current driving ability is insufficient, pin and the resistance R of microcontroller5Connection, resistance R5With PNP triode
Connection increases driving current by a PNP triode.Diode is in parallel with intermediate relay KM.Resistance R5, PNP triode
Output driving amplifying circuit is constituted with diode.When supply voltage is more than trip threshold and tripping is allowed to be arranged, intermediate relay is connect
The microcontroller pin level of device KM becomes low level from high level, and PNP triode is saturation conduction at this time, to connect it is intermediate after
Circuit where electric appliance, relay moving together contact KM are closed, and connect the breaking coil of low-voltage circuit breaker with matching, are realized
The tripping of low-voltage circuit breaker, to realize voltage protection.It, only need to be logical by number if low-voltage circuit breaker supports digital control approach
Letter interface module is connect with the digital control interface of the low-voltage circuit breaker can be realized voltage protection.
Harmonic component is usually little in actual electric network, to being answered in low pressure family, little Wei enterprises and rural power grids user
For, frequency analysis need to only calculate its power frequency component and 2~25 order harmonic components.
As shown in Fig. 2, when low-voltage circuit breaker supports digital control approach, voltage protection control module is not needed, yet
There is no intermediate relay contact to be connected with circuit breaker trip coil, it only need to be by Interface for digital communication module and the low-voltage circuit breaker
Voltage protection can be realized in digital control interface connection.As shown in figure 3, when low-voltage circuit breaker does not support digital control approach,
Need voltage protection control module, the breaking coil connection of voltage protection control module and low-voltage circuit breaker.
For three-phase AC electrical supply system, there is three-phase three-wire system (to indicate that this just has A phases, B with A, B, C respectively per phase
Phase, C phases are not) and three-phase four-wire system (in addition to corresponding three line of A phase, B phase, C phase, also 1 neutral conductor, being indicated with N).
Fig. 1 to Fig. 3 can indicate the case where supply voltage is single-phase voltage, can be divided into following two situations：
1, single-phase situation 1, using phase voltage as rated voltage (rated voltage 220V), then L1, L2 in Fig. 1 or Fig. 2 or Fig. 3
Can be A, N, any one in B, N or C, N；
2, single-phase situation 2, using line voltage as rated voltage (rated voltage 380V), then L1, L2 in Fig. 1 or Fig. 2 or Fig. 3
Can be A, B, any one in B, C or C, A.
In addition it can be extended for the case where piezoelectric voltage is three-phase from Fig. 1, Fig. 2 or Fig. 3, can be divided into following two
Situation：
First voltage changing module is extended to three groups by 1, three-phase situation 1, three-phase three-wire system, i.e. electricity in Fig. 1 or Fig. 2 or Fig. 3
Press mutual inductor, resistance R1、R2、R3、R4, capacitance C3It is extended to three groups with reference voltage source, L1, L2 in Fig. 1 or Fig. 2 or Fig. 3 become
For phase three-wire three A, B, C.A, B, B, C, C, A correspond to one group of first voltage changing module, are carried out respectively to the three-phase voltage of input respectively
Voltage is converted；
First voltage changing module is extended to three groups by 2, three-phase situation 2, three-phase four-wire system, i.e. electricity in Fig. 1 or Fig. 2 or Fig. 3
Press mutual inductor, resistance R1、R2、R3、R4, capacitance C3It is extended to three groups with reference voltage source, L1, L2 in Fig. 1 or Fig. 2 or Fig. 3 become
For three-phase and four-line A, B, C and neutral conductor N.A, N, B, N, C, N correspond to one group of first voltage changing module respectively, to the three-phase voltage of input
Voltage conversion is carried out respectively.
The utility model proposes a kind of low-voltage circuit breaker voltage monitorings based on microcontroller design to be filled with voltage protection
It sets, develops voltage deviation and voltage harmonic aberration rate parser based on FFT, pass through the emulation on Proteus platforms
And installation cost measuring and calculating, the results showed that, the device can at lower cost and conveniently realize low pressure family, little Wei enterprises and
The voltage monitoring of rural power grids user side and protection.
The above embodiments are only illustrative of the principle and efficacy of the utility model, new not for this practicality is limited
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
All equivalent modifications completed under refreshing and technological thought or change, should be covered by the claim of the utility model.
Claims (10)
1. low-voltage circuit breaker voltage monitoring and voltage protection, which is characterized in that described device includes：First becomes pressing mold
Block, the second Transformer Rectifier module, analog-digital converter, analysis controlling unit, Interface for digital communication module and alarm module；
First voltage changing module is connect with the analog-digital converter, and first voltage changing module converts the alternating voltage of input
To be suitble to be input to the voltage signal of the analog-digital converter；
The analysis controlling unit is connect with the analog-digital converter, and the voltage signal of input is converted by the analog-digital converter
Digital signal is simultaneously output to the analysis controlling unit；
The analysis controlling unit is connect with the Interface for digital communication module, the alarm module；
The second Transformer Rectifier module is used to the alternating voltage of input being converted into DC voltage, be the analog-digital converter,
The analysis controlling unit and the Interface for digital communication module for power supply；
Described device is connect with low-voltage circuit breaker.
2. low-voltage circuit breaker voltage monitoring as described in claim 1 and voltage protection, which is characterized in that described first
Voltage changing module includes voltage transformer, voltage magnitude attenuator circuit and DC potential biasing circuit.
3. low-voltage circuit breaker voltage monitoring as described in claim 1 and voltage protection, which is characterized in that described second
Transformer Rectifier module includes transformer, rectification circuit and regulator circuit.
4. the low-voltage circuit breaker voltage monitoring and voltage protection, feature as described in claim 1-3 any one exist
In the Interface for digital communication module is connect with low-voltage circuit breaker.
5. the low-voltage circuit breaker voltage monitoring and voltage protection, feature as described in claim 1-3 any one exist
In described device further includes voltage protection control module, and the voltage protection control module is connect with low-voltage circuit breaker.
6. low-voltage circuit breaker voltage monitoring as claimed in claim 5 and voltage protection, which is characterized in that the voltage
It includes output driving amplifying circuit, intermediate relay and intermediate relay corresponding with the intermediate relay to protect control module
The breaking coil of contact, the intermediate relay contact and low-voltage circuit breaker connects.
7. low-voltage circuit breaker voltage monitoring as described in claim 1 and voltage protection, which is characterized in that the number
Communication interface modules is RS232 communication interface modules or RS485 communication interface modules.
8. low-voltage circuit breaker voltage monitoring as described in claim 1 and voltage protection, which is characterized in that the alarm
Module is sound-light alarm.
9. low-voltage circuit breaker voltage monitoring as described in claim 1 and voltage protection, which is characterized in that the number
The connection of communication interface modules and the low-voltage circuit breaker for supporting digital control approach is wired connection or wireless connection.
10. low-voltage circuit breaker voltage monitoring as described in claim 1 and voltage protection, which is characterized in that the dress
It further includes button and display screen to set, and the button and display screen are connect with the analysis controlling unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820339494.XU CN208013377U (en) | 2018-03-13 | 2018-03-13 | Low-voltage circuit breaker voltage monitoring and voltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820339494.XU CN208013377U (en) | 2018-03-13 | 2018-03-13 | Low-voltage circuit breaker voltage monitoring and voltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208013377U true CN208013377U (en) | 2018-10-26 |
Family
ID=63888674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820339494.XU Active CN208013377U (en) | 2018-03-13 | 2018-03-13 | Low-voltage circuit breaker voltage monitoring and voltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208013377U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188181A (en) * | 2018-09-08 | 2019-01-11 | 国网山西省电力公司电力科学研究院 | Network voltage transformer secondary circuit neutral conductor virtual connection judgment method |
| CN114740343A (en) * | 2022-04-13 | 2022-07-12 | 安徽中安昊源电力科技有限公司 | Real-time detection system for circuit breaker |
-
2018
- 2018-03-13 CN CN201820339494.XU patent/CN208013377U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188181A (en) * | 2018-09-08 | 2019-01-11 | 国网山西省电力公司电力科学研究院 | Network voltage transformer secondary circuit neutral conductor virtual connection judgment method |
| CN109188181B (en) * | 2018-09-08 | 2020-09-04 | 国网山西省电力公司电力科学研究院 | Virtual connection judgment method for neutral line of secondary circuit of power grid voltage transformer |
| CN114740343A (en) * | 2022-04-13 | 2022-07-12 | 安徽中安昊源电力科技有限公司 | Real-time detection system for circuit breaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103501058B (en) | Based on the energy efficiency management system of Intelligent platform zone | |
| CN208013377U (en) | Low-voltage circuit breaker voltage monitoring and voltage protection | |
| CN106451487A (en) | 220kV urban power grid reactive power compensation method | |
| CN206850446U (en) | A kind of intelligent load-balancing regulator | |
| CN207218249U (en) | A kind of intelligent balance pressure regulation harmonic elimination comprehensive treatment device | |
| CN204721106U (en) | Based on the power transmission line overhead ground wire electromagnetism energy taking device of super capacitor | |
| CN204304441U (en) | A kind of reactive power dynamic compensation system | |
| CN201518419U (en) | High-voltage, medium-voltage and low-voltage comprehensive compensation control system for arc furnace | |
| CN108490248B (en) | Voltage monitoring and protecting device | |
| CN207819456U (en) | A kind of power distribution network three-phase voltage compensation device based on independent voltage injection | |
| CN208401529U (en) | Low-voltage circuit breaker with voltage monitoring and voltage protection | |
| CN207939211U (en) | Distributed power generation pressure regulation filtering system | |
| CN204144950U (en) | A kind of compensation program control circuit on-load voltage regulation system | |
| CN201466724U (en) | Intelligent single-phase power saving protective controller | |
| CN208401528U (en) | Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting | |
| CN203606404U (en) | Multiple transformation ratio current transformer intelligent control device | |
| CN203289113U (en) | Low-voltage load unbalance adjusting and intelligent reactive dynamic compensation device | |
| CN102237809A (en) | Switching power circuit for three-phase intelligent electric energy meter | |
| CN205509521U (en) | Adjusting device is synthesized to photovoltaic power generation system electric energy quality | |
| Blazic et al. | Analysis of flicker mitigation in a utility distribution network | |
| CN209217729U (en) | A kind of three-phase load unbalance regulating system | |
| CN204086470U (en) | A kind of high-performance low-voltage filter capacitor overpressure resistance detecting device | |
| CN208656425U (en) | A kind of intelligent powerless compensation device | |
| CN206542192U (en) | A kind of new reactive power automatic compensation device | |
| CN206759061U (en) | Low voltage three-phase intelligently adjusts weighing apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shengsi County Ruitong Computer Technology Co.,Ltd. Assignor: Zhejiang Ocean University Contract record no.: X2023980045989 Denomination of utility model: Voltage monitoring and protection devices for low-voltage circuit breakers Granted publication date: 20181026 License type: Common License Record date: 20231106 |
|
| EE01 | Entry into force of recordation of patent licensing contract |