CN208401528U - Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting - Google Patents
Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting Download PDFInfo
- Publication number
- CN208401528U CN208401528U CN201820339227.2U CN201820339227U CN208401528U CN 208401528 U CN208401528 U CN 208401528U CN 201820339227 U CN201820339227 U CN 201820339227U CN 208401528 U CN208401528 U CN 208401528U
- Authority
- CN
- China
- Prior art keywords
- voltage
- module
- low
- residual current
- circuit breaker
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting, comprising: the first voltage changing module, the second Transformer Rectifier module, analog-digital converter, analysis controlling unit, alarm module, voltage protection module, breaking coil and residual current protecting 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 alarm module and voltage protection module, and voltage protection module includes intermediate relay, and intermediate relay controls breaking coil；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 voltage protection module power supply.The utility model realizes to the monitoring of supply voltage deviation and voltage harmonic aberration rate and realizes voltage protection, avoids that voltage deviation is larger or harmonic voltage transfinites and operates normally to user equipment and the influence of service life.
Description
Technical field
The utility model relates to low-voltage distribution fields, more particularly to voltage monitoring and voltage protection and residual current
The low-voltage circuit breaker of protection.
Background technique
Previous " power supply and business rules " regulation: " when the peak load of grid as defined in power supply enterprise: 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 " regulations of electric power supply and use " that 2016 promulgate of having changed one's profession).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 --- No. 215 " power of (83) water power wealth word
Factor adjusts electricity charge method " allow to calculate monthly average power factor by user monthly practical active energy and capacity of idle power.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, will cause reactive power surplus and make the voltage level of distribution end higher.
On the other hand, due to environment in recent years, more and more attention has been paid in national legislation policy with energy security problem
Under promotion, the renewable energy power generation application of user side is just gradually quicklyd increase.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 distribution is run
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, it may be to the power quality of distribution, power supply reliability, the configuration of relay protection and adjusting etc.
A series of influences are brought, the control measure of original distribution 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, will affect the normal operation of user equipment when voltage deviation is larger or harmonic voltage transfinites and makes
With the service life, power supply system internal fault cause supply voltage to increase and cause wide range of users electrical equipment to be damaged case also repeatly
See not fresh.And it is widely used in being integrated with short-circuit protection, overload in the a/D small circuit breaker of low-voltage distribution system terminal
Protection and earth leakage protective etc., but the case where consider when voltage is higher or relatively low and harmonic voltage transfinites.
Utility model content
It is disconnected that the purpose of the utility model is to provide the low pressure with voltage monitoring and voltage protection and residual current protecting
Road device.Therefore, the utility model uses following technical scheme.
Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting, the low-voltage circuit breaker packet
It includes: the first voltage changing module, the second Transformer Rectifier module, analog-digital converter, analysis controlling unit, alarm module, voltage protection mould
Block, breaking coil and residual current protecting 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 alarm module and the voltage protection module, the voltage protection module
Including intermediate relay, the intermediate relay controls the breaking coil；
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, analysis controlling unit and voltage protection module power supply.
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 voltage regulator circuit.
Preferably, the voltage protection module further includes output driving amplifying circuit.
Preferably, the low-voltage circuit breaker further includes Interface for digital communication module, the Interface for digital communication module and institute
State analysis controlling unit connection.
Preferably, the Interface for digital communication module is RS232 communication interface modules or RS485 communication interface modules.
Preferably, the residual current protecting module includes zero sequence current mutual inductor and electric current relay, the electric current after
Breaking coil described in electrical equipment control.
Preferably, the alarm module is sound-light alarm.
Preferably, described device further includes key and display screen, the key and display screen and the analysis controlling unit
Connection.
It provides the beneficial effects of the utility model are: the utility model is based on single-chip microcontroller design with voltage monitoring and electricity
The low-voltage circuit breaker of pressure protection and residual current protecting, is realized to the monitoring of supply voltage deviation and voltage harmonic aberration rate simultaneously
It realizes voltage protection, avoids that voltage deviation is larger or harmonic voltage transfinites user equipment is operated normally and the shadow of service life
It rings.In addition, the rectifying and voltage-stabilizing input circuit of the device of the utility model and voltage signal circuit to be measured respectively use one group of transformer,
Interference to avoid rectifying and voltage-stabilizing input circuit to voltage signal to be measured.
Detailed description of the invention
Fig. 1 is the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting of the utility model
Structure chart.
Specific embodiment
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
Every other embodiment obtained, fall within the protection scope of the utility model.
Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting, low-voltage circuit breaker include: the
One voltage changing module, the second Transformer Rectifier module, analog-digital converter, analysis controlling unit, alarm module, voltage protection module, jump
Brake cable circle and residual current protecting module；First voltage changing module is connect with analog-digital converter, and the first voltage changing module is by the friendship of input
Galvanic electricity pressure is converted to the voltage signal for being suitble to be input to analog-digital converter；Analysis controlling unit is connect with analog-digital converter, modulus
The voltage signal of input is converted into digital signal and is output to analysis controlling unit by converter, and analysis controlling unit can be list
Piece machine is also possible to MCU, and analysis controlling unit calculates voltage deviation and voltage harmonic aberration rate；Analysis controlling unit and alarm mould
Block is connected with voltage protection module, and voltage protection module includes intermediate relay, and intermediate relay controls breaking coil；Second becomes
Repoussage flow module is used to the alternating voltage of input being converted into DC voltage, is analog-digital converter, analysis controlling unit and voltage
Protective module power supply.Residual current protecting module includes zero sequence current mutual inductor and electric current relay, and electric current relay control is jumped
Brake cable circle
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 voltage rating UNDifference to the percentage value of voltage rating, it may be assumed that
According to the regulation of GB/T 12325-2008 " power quality supply voltage deviation ", 20kV and following three phase supply electricity
Pressure deviation is that ± 7%, the 220V single phase power supply 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 referring 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 ratio HRVhIndex degree
Amount:
Subscript h in formula indicates overtone order, and being above designated as the 1 expression parameter is 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, supply voltage converts to obtain 0~5V ac voltage signal (i.e. input AC time through voltage transformer
Road)；The voltage is via R1、R2、R3The passive attenuation circuit of composition carries out the range of decrease, adds based on reference voltage source (TL431)
Direct current biasing, to guarantee the voltage signal of input a/d converter between 0~+5V, A/D converter is calculated by sampling by mould
Quasi- voltage signal is converted into digital signal (i.e. A/D sample conversion circuit) and is output to single-chip microcontroller or MCU, single-chip microcontroller or MCU because
This is obtained discrete voltage data (single-chip microcontroller that included A/D conversion function can also be used), then is realized based on fft algorithm to power frequency
And related subharmonic voltage (2~25 subharmonic voltage) extraction and voltage deviation and voltage harmonic aberration rate calculating.FFT
Algorithm is realized by single-chip microcontroller or MCU.When the voltage deviation of calculating is greater than preset value, (such as ± 20%) or voltage harmonic are abnormal
When variability transfinites, single-chip microcontroller or MCU can change the state (setting 0) of corresponding pin, with start the alarm module being connected or/
And voltage protection module, to issue sound-light alarm prompt or/and carry out corresponding trip operation.Interface for digital communication can use
Digital control letter can be transmitted in RS232 Interface for digital communication or RS485 Interface for digital communication, RS232 or RS485 Interface for digital communication
Number, (also can be used as the reserved communication interface of intelligent control) such as data is uploaded, voltage monitoring situation can be uploaded.Communication interface
When using MAX485 chip or MAX232 chip, RS485 or RS232 communication interface can be respectively constituted.The DC power supply of device is logical
It crosses full-wave rectification and is obtained plus 7805 voltage regulator circuits, DC power supply is provided for A/D converter, MCU and digital port, to keep away
Exempt from the interference to voltage signal to be measured, rectifying and voltage-stabilizing input circuit uses another supply transformer (i.e. rectification of supply voltage
Loop of voltage regulation).
Can realize whether to allow voltage alarm by key, 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 mouth
Pressure alarm, tripping control signal, if allow rate of qualified voltage, highest/minimum through RS232 or RS485 digital communication 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 and voltage harmonic aberration rate before variability, signal relief, if allow to 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).
Single-chip microcontroller pin current driving ability is insufficient, the pin and resistance R of single-chip 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 single-chip microcontroller pin level of device KM becomes low level from high level, and PNP triode is saturation conduction at this time, thus connect it is intermediate after
Circuit where electric appliance connects breaking coil by the intermediate relay moving together contact KM and realizes tripping, to realize voltage protection.
Residual current protecting module detects the zero-sequence current (i.e. residual current) in primary circuit, when zero-sequence current is greater than whole
When definite value, electric current relay movement, so that connecting breaking coil realizes tripping, to realize residual current protecting.
Harmonic component is usually little in actual electric network, answers in low pressure family, little Wei enterprise and rural power grids user
For, frequency analysis need to only calculate its power frequency component and 2~25 order harmonic components.
For three-phase AC electrical supply system, having three-phase three-wire system, (every phase indicates that this just has A phase, B with A, B, C respectively
Phase, C phase are not) and three-phase four-wire system (in addition to corresponding three line of A phase, B phase, C phase, there are also 1 neutral conductors, are indicated with N).
Fig. 1 can indicate the case where supply voltage is single-phase voltage, can be divided into following two situation:
1, single-phase situation 1, using phase voltage as voltage rating (voltage rating 220V), then L1, L2 in Fig. 1 can be A, N,
B, any one in N or C, N；
2, single-phase situation 2, using line voltage as voltage rating (voltage rating 380V), then L1, L2 in Fig. 1 can be A, B,
B, any one in C or C, A.
In addition it can be extended for from Fig. 1 piezoelectric voltage be three-phase the case where, following two situation can be divided into:
1, the first voltage changing module is extended to three groups by three-phase situation 1, three-phase three-wire system, i.e. voltage transformer in Fig. 1,
Resistance R1、R2、R3、R4, capacitor C3Three groups are extended to reference voltage source, L1, L2 in Fig. 1 become phase three-wire three A, B, C.A, B,
B, C, C, A respectively correspond one group of first voltage changing module, carry out voltage conversion respectively to the three-phase voltage of input；
2, the first voltage changing module is extended to three groups by three-phase situation 2, three-phase four-wire system, i.e. voltage transformer in Fig. 1,
Resistance R1、R2、R3、R4, capacitor C3Be extended to three groups with reference voltage source, L1, L2 in Fig. 1 become three-phase and four-line A, B, C and in
Property line N.A, N, B, N, C, N respectively correspond one group of first voltage changing module, carry out voltage conversion respectively to the three-phase voltage of input.
The utility model proposes a kind of SCM Based with voltage monitoring and voltage protection and residual current guarantor
The low-voltage circuit breaker of shield develops voltage deviation and voltage harmonic aberration rate parser based on FFT, by Proteus
Emulation on platform and installation cost measuring and calculating, the results showed that, the device can at lower cost and conveniently realize low pressure family,
The voltage monitoring and protection of little Wei enterprise and rural power grids user side.
The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new
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 or change completed under mind and technical idea, should be covered by the claim of the utility model.
Claims (8)
1. the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting, which is characterized in that the low pressure
Breaker includes: the first voltage changing module, the second Transformer Rectifier module, analog-digital converter, analysis controlling unit, alarm module, electricity
Press protective module, breaking coil and residual current protecting 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 alarm module and the voltage protection module, and the voltage protection module includes
Intermediate relay, the intermediate relay control the breaking coil；
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 voltage protection module power supply；
The residual current protecting module includes zero sequence current mutual inductor and electric current relay, described in the electric current relay control
Breaking coil.
2. the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting as described in claim 1,
It is characterized in that, first voltage changing module includes voltage transformer, voltage magnitude attenuator circuit and DC potential biasing circuit.
3. the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting as described in claim 1,
It is characterized in that, the second Transformer Rectifier module includes transformer, rectification circuit and voltage regulator circuit.
4. the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting as described in claim 1,
It is characterized in that, the voltage protection module further includes output driving amplifying circuit.
5. the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting as described in claim 1,
It is characterized in that, the low-voltage circuit breaker further includes Interface for digital communication module, the Interface for digital communication module and the analysis
Control unit connection.
6. the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting as claimed in claim 5,
It is characterized in that, the Interface for digital communication module is RS232 communication interface modules or RS485 communication interface modules.
7. the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting as described in claim 1,
It is characterized in that, the alarm module is sound-light alarm.
8. the low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting as described in claim 1,
It is characterized in that, the low-voltage circuit breaker further includes key and display screen, the key and display screen and the analysis controlling unit
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820339227.2U CN208401528U (en) | 2018-03-13 | 2018-03-13 | Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820339227.2U CN208401528U (en) | 2018-03-13 | 2018-03-13 | Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208401528U true CN208401528U (en) | 2019-01-18 |
Family
ID=65064200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820339227.2U Active CN208401528U (en) | 2018-03-13 | 2018-03-13 | Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208401528U (en) |
-
2018
- 2018-03-13 CN CN201820339227.2U patent/CN208401528U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103501058B (en) | Based on the energy efficiency management system of Intelligent platform zone | |
| CN101807799B (en) | Super capacitor energy storage type power quality compensator | |
| CN201260080Y (en) | Device for passive compensation and harmonic wave control for intelligent electric power system | |
| CN103647293B (en) | Low-voltage platform area monitoring of working condition and three-phrase burden balance automatic adjustment system | |
| CN110460052B (en) | Photovoltaic inversion control method capable of improving power quality of power distribution network | |
| CN206850446U (en) | A kind of intelligent load-balancing regulator | |
| CN102664400B (en) | Monitoring method for electric energy quality | |
| CN208013377U (en) | Low-voltage circuit breaker voltage monitoring and voltage protection | |
| CN204304441U (en) | A kind of reactive power dynamic compensation system | |
| CN204721106U (en) | Based on the power transmission line overhead ground wire electromagnetism energy taking device of super capacitor | |
| CN110333409A (en) | The online test method of distribution transformer rated capacity | |
| CN108490248A (en) | A kind of voltage monitoring and voltage protection | |
| CN201518419U (en) | High-voltage, medium-voltage and low-voltage comprehensive compensation control system for arc furnace | |
| CN208401528U (en) | Low-voltage circuit breaker with voltage monitoring and voltage protection and residual current protecting | |
| CN208401529U (en) | Low-voltage circuit breaker with voltage monitoring and voltage protection | |
| CN207819456U (en) | A kind of power distribution network three-phase voltage compensation device based on independent voltage injection | |
| CN201378176Y (en) | High-precision anti-interference excitation power supply for ground screen flaw comprehensively-diagnosing system in transformer substation | |
| CN207939211U (en) | Distributed power generation pressure regulation filtering system | |
| CN203883473U (en) | Double-frequency ship shore power device | |
| CN107453360A (en) | A kind of power supply quality optimizes device and method | |
| CN108336818B (en) | Intelligent power distribution terminal and charging station charging management system | |
| 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 | |
| CN204086470U (en) | A kind of high-performance low-voltage filter capacitor overpressure resistance detecting device | |
| CN106849105A (en) | Low-voltage distributing line intelligent regulating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |