CN205791462U - It is applicable to the transformator broken neutral line monitoring system of low-voltage network - Google Patents
It is applicable to the transformator broken neutral line monitoring system of low-voltage network Download PDFInfo
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- CN205791462U CN205791462U CN201620561673.9U CN201620561673U CN205791462U CN 205791462 U CN205791462 U CN 205791462U CN 201620561673 U CN201620561673 U CN 201620561673U CN 205791462 U CN205791462 U CN 205791462U
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Abstract
This utility model relates to a kind of transformator broken neutral line monitoring system being applicable to low-voltage network, and it is technically characterized by comprising the steps as follows: and includes transformator broken neutral line monitoring terminal and mobile monitoring terminal；Current transformer and the voltage transformer of transformator broken neutral line monitoring terminal are connected in MCU module by signal conditioning circuit and A/D change-over circuit; MCU module is connected with circuit breaker switch state detection module, breaker control module, mobile communication module and memory module the most respectively; this circuit breaker switch state detection module is connected with protection switch disconnector, and breaker control module is connected with protection switch disconnector.This utility model exchange of information by Real-time Collection transformator outlet, broken neutral line fault message can be diagnosed to be rapidly and accurately, fault message transmission and output control function is carried out by wireless network, electrical appliance shell can be avoided to produce the drift potential harm to the contact voltage of human body, substantially increase the safety of electricity consumption.
Description
Technical field
This utility model belongs to low-voltage distribution technical field, a kind of transformator neutrality being applicable to low-voltage network
Line system for monitoring wire break.
Background technology
In low-voltage distribution system, three-phase four-wire power supply mode is widely adopted.The low-voltage distribution system of three-phase four-wire system
Unite and make when design threephase load reach balance the most as much as possible, but, due to the existence of single-phase load, inevitably result in three
The imbalance of phase load distribution, thus produce out-of-balance current, in this case, the neutral conductor turns on, and out-of-balance current passes through
The neutral conductor flows back to neutral point, so that the line voltage of electric power system, phase voltage kept in balance.Therefore, power supply unit is neutral
Line is not allow broken string, but, due to factor impacts such as heat effect, mechanical force, joint oxidations, all it is likely to occur the neutral conductor
Disconnection fault.If the neutral conductor disconnects, the irregular working of electrical equipment can be caused even to burn out.
In three phase and four wire circuit system, between the transformator neutral conductor and triple line, constitute a stable power supply body
System.There is only can affect during broken string the power supply of this phase load in phase line, and this phase load does not constitute harm, but the neutral conductor breaks
Line harm is very big, and when broken neutral line, load neutral point, by the phase deviation big to load, so causes loading big phase voltage
Reducing, load little phase voltage and raise, threephase load imbalance degree is the most serious, and load neutral point displacement is the biggest.Logical
In normal broken neutral line fault, load big phase voltage and can be reduced to below 150V, load little phase voltage and then raise
To about 300V, even close to line voltage 380V, so loading big phase electrical equipment even can burn because brownout can not run
Ruin, load little phase electrical equipment and be then burned out because of overtension, bring serious economic loss to low-voltage customer.This
Outward, the neutral conductor once breaks, and the electrical equipment using protection to connect to neutral will lose protection.Equipment once produces residue electricity
Stream, it will cause person electric shock；Even if equipment does not produces residual current, the neutral conductor makes outside equipment component per se with dangerous voltage
Shell is charged, can cause accident of human electric shock equally, communication around and sophisticated electronics can be produced interference simultaneously.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that a kind of reasonable in design, real-time and peace
The full transformator broken neutral line monitoring system being applicable to low-voltage network reliably.
This utility model solves it and technical problem is that and take techniques below scheme to realize:
A kind of transformator broken neutral line monitoring system being applicable to low-voltage network, supervises including transformator broken neutral line
Survey terminal, wireless network and mobile monitoring terminal；Described transformator broken neutral line monitoring terminal includes MCU module, power supply
Module, current transformer, voltage transformer, current signal conditioning circuit, voltage signal conditioning circuit, two A/D change-over circuits,
Circuit breaker switch state detection module, breaker control module, mobile communication module and memory module；Described power module connects
Powering for modules in MCU module, the input of described current transformer and voltage transformer is connected to transformator outlet,
The outfan of current transformer and voltage transformer connects on current signal conditioning circuit, voltage signal conditioning circuit respectively, electricity
Stream signal conditioning circuit, voltage signal conditioning circuit are connected in MCU module by A/D change-over circuit respectively, and this MCU module is also
Being connected with circuit breaker switch state detection module, breaker control module, mobile communication module and memory module respectively, this breaks
Road device on off state detection module is connected with protection switch disconnector for detecting the on off state letter protecting switch disconnector
Breath, described breaker control module and protection switch disconnector are for controlling to protect the switch of switch disconnector；Described movement is led to
News module is connected with mobile monitoring terminal by wireless network.
Described MCU module is also connected with a sound and light alarm module and realizes sound and light of alarm.
Described mobile monitoring terminal is mobile phone.
Advantage of the present utility model and good effect be:
Transformator broken neutral line monitoring terminal is connected by this utility model with transformator outlet, Real-time Collection transformator
The exchange of information of outlet, it is possible to be diagnosed to be broken neutral line fault message rapidly and accurately, carries out fault by wireless network
Information transmission and output control function, send protection act signal in time, disconnects distribution line, effectively protection equipment safety,
Improve the power supply reliability of electrical network, the difficult problem protected in time after solving low-voltage network transformator broken neutral line, can avoid
Electrical appliance shell produces the drift potential harm to the contact voltage of human body, substantially increases the safety of electricity consumption.
Accompanying drawing explanation
Fig. 1 is system connection diagram of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model embodiment is further described:
A kind of transformator broken neutral line monitoring system being applicable to low-voltage network, as it is shown in figure 1, include in transformator
Property line disconnection monitoring terminal, wireless network and mobile monitoring terminal.Described transformator broken neutral line monitoring terminal is by moving
Dynamic communication network is connected with mobile monitoring terminal, and described transformator broken neutral line monitoring terminal includes MCU module, power supply mould
Block, current transformer, voltage transformer, current signal conditioning circuit, voltage signal conditioning circuit, two A/D change-over circuits, disconnected
Road device on off state detection module, breaker control module, sound and light alarm module, mobile communication module, memory module.Power supply mould
Block is connected in MCU module power for modules, and the input of described current transformer and voltage transformer is connected to transformation
The outfan of the electric lines of force of device outgoing line side, current transformer and voltage transformer connects current signal conditioning circuit, voltage respectively
On signal conditioning circuit, current signal conditioning circuit, voltage signal conditioning circuit are connected to MCU by A/D change-over circuit respectively
In module, this MCU module the most respectively with circuit breaker switch state detection module, breaker control module, sound and light alarm module, shifting
Dynamic communication module, memory module are connected and realize controlling function accordingly.In the present embodiment, mobile monitoring terminal is mobile phone,
Operation maintenance personnel receives, by mobile monitoring terminal, warning message that transformator broken neutral line monitoring terminal sends in time and can send out
Go out to control fame and gain and disconnect protection switch disconnector.Below modules is illustrated respectively:
Described current transformer and voltage transformer are connected on the electric lines of force of transformator outgoing line side gather transformator outlet
The AC signal of side, current regulating circuit and voltage modulate circuit are connected respectively on current transformer and voltage transformer, right
AC signal is filtered, amplification etc. processes and respectively obtains stable current signal and voltage signal, and two A/D change-over circuits divide
MCU module is sent to after current signal and voltage signal not being converted to digital signal.Described circuit breaker switch state detection mould
Block is connected for detecting the switching-state information protecting switch disconnector with protection switch disconnector.
MCU module is the nucleus module of whole transformator broken neutral line monitoring terminal, between it is by other modules
Communication complete transformator broken neutral line monitoring and defencive function.First, current transformer, voltage transformer are gathered by it
Data carry out being calculated the three-phase voltage of transformator outgoing line side, electric current, power factor, active power, reactive power, electrical network frequency
The data such as rate, phase angle and neutral point current, according to the phasor of three-phase current with calculate neutral current the number with sampling
According to contrasting, according to comparison result quick diagnosis transformator broken neutral line fault.When there is broken neutral line fault, permissible
Send fault message by wireless network to mobile monitoring terminal by mobile communication module, hold the electricity of mobile monitoring terminal
Protection switch disconnector, to MCU module transmitting control commands, is carried out by control module by Force system operation maintenance personnel by MCU module
Control, thus complete the defencive function of the electrical equipment to low-voltage customer.
Mobile communication module is connected with MCU module, and it is connected with mobile monitoring terminal by wireless network and carries out
Data and the transfer function of order.It is mobile that mobile communication module can use GSM communication module or GPRS communication module to be connected to
In communication network, data and control command all transmit by the way of note.
Memory module is connected with MCU module, the parameter needed during depositing some terminal operatings, records outlet
Side electric power data and fault message.
Human-computer interaction module is made up of liquid crystal display screen and keyboard and is connected with MCU module, is mainly used in safeguarding local runtime
Parameter or for equipment debugging and maintenance.
Breaker control module with protection switch disconnector be connected, when occur transformator broken neutral line fault time and
After MCU module receives the mobile control command controlling terminal, disconnect protection switch disconnector, it is achieved protection controls function.
Audible-visual annunciator is connected with MCU module, when there is transformator broken neutral line fault, sends sound and light alarm,
Prompting Field Force process in time.
Installation and application of the present utility model is: transformator broken neutral line monitoring terminal is arranged on transformator outlet
Side, outgoing line side A, B, C, N pressure-wire is connected with voltage transformer respectively, and three-phase current and neutral current are mutual with electric current respectively
Sensor is connected, and is connected with circuit breaker switch state detection module by the quantity of state of protection switch disconnector, protection is switched
The control interface of chopper is connected with breaker control module, and arranges the logical of mobile monitoring terminal by human-computer interaction module
Signal code and other operational factors.During work, after MCU module finds neutral conductor fault, send fault letter to mobile monitoring terminal
Breath, operation maintenance personnel disconnects protection switch disconnector by mobile monitoring terminal, or is processed by Field Force.
It is emphasized that embodiment described in the utility model is illustrative rather than determinate, therefore this reality
By the novel embodiment including and being not limited to described in detailed description of the invention, every new according to this practicality by those skilled in the art
Other embodiments that the technical scheme of type draws, also belong to the scope of this utility model protection.
Claims (3)
1. the transformator broken neutral line monitoring system being applicable to low-voltage network, it is characterised in that: include in transformator
Property line disconnection monitoring terminal, wireless network and mobile monitoring terminal；Described transformator broken neutral line monitoring terminal includes MCU
Module, power module, current transformer, voltage transformer, current signal conditioning circuit, voltage signal conditioning circuit, two A/D
Change-over circuit, circuit breaker switch state detection module, breaker control module, mobile communication module and memory module；Described electricity
Source module is connected in MCU module power for modules, and the input of described current transformer and voltage transformer is connected to
The outfan of transformator outlet, current transformer and voltage transformer connects current signal conditioning circuit respectively, voltage signal is adjusted
On reason circuit, current signal conditioning circuit, voltage signal conditioning circuit are connected in MCU module by A/D change-over circuit respectively,
This MCU module the most respectively with circuit breaker switch state detection module, breaker control module, mobile communication module and memory module
Being connected, this circuit breaker switch state detection module is connected for detecting protection switch disconnector with protection switch disconnector
Switching-state information, described breaker control module and protection switch disconnector are for controlling to protect the switch of switch disconnector；
Described mobile communication module is connected with mobile monitoring terminal by wireless network.
The transformator broken neutral line monitoring system being applicable to low-voltage network the most according to claim 1, its feature exists
In: described MCU module is also connected with a sound and light alarm module and realizes sound and light of alarm.
The transformator broken neutral line monitoring system being applicable to low-voltage network the most according to claim 1 and 2, its feature
It is: described mobile monitoring terminal is mobile phone.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620561673.9U CN205791462U (en) | 2016-06-06 | 2016-06-06 | It is applicable to the transformator broken neutral line monitoring system of low-voltage network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620561673.9U CN205791462U (en) | 2016-06-06 | 2016-06-06 | It is applicable to the transformator broken neutral line monitoring system of low-voltage network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107515353A (en) * | 2017-09-08 | 2017-12-26 | 深圳供电局有限公司 | A kind of bis- neutral conductor operation intelligent monitors of PT/CT |
| CN108281939A (en) * | 2018-03-20 | 2018-07-13 | 四川电之盾安全技术有限公司 | Three-phase electricity high security broken neutral line protective device |
| CN108957203A (en) * | 2018-05-22 | 2018-12-07 | 南京南瑞继保电气有限公司 | A method of detection PT broken neutral line |
| CN111654104A (en) * | 2020-05-27 | 2020-09-11 | 四川恒鸿电力建设有限公司 | Power distribution room running state fault monitoring system |
| CN112821359A (en) * | 2020-12-25 | 2021-05-18 | 深圳供电局有限公司 | Protection system for power line, circuit breaker, and protection method for power line |
-
2016
- 2016-06-06 CN CN201620561673.9U patent/CN205791462U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107515353A (en) * | 2017-09-08 | 2017-12-26 | 深圳供电局有限公司 | A kind of bis- neutral conductor operation intelligent monitors of PT/CT |
| CN108281939A (en) * | 2018-03-20 | 2018-07-13 | 四川电之盾安全技术有限公司 | Three-phase electricity high security broken neutral line protective device |
| CN108281939B (en) * | 2018-03-20 | 2024-02-09 | 四川电之盾安全技术有限公司 | Neutral line breakage protection device with high safety for three-phase electricity |
| CN108957203A (en) * | 2018-05-22 | 2018-12-07 | 南京南瑞继保电气有限公司 | A method of detection PT broken neutral line |
| CN108957203B (en) * | 2018-05-22 | 2021-02-09 | 南京南瑞继保电气有限公司 | Method for detecting PT neutral line disconnection |
| CN111654104A (en) * | 2020-05-27 | 2020-09-11 | 四川恒鸿电力建设有限公司 | Power distribution room running state fault monitoring system |
| CN112821359A (en) * | 2020-12-25 | 2021-05-18 | 深圳供电局有限公司 | Protection system for power line, circuit breaker, and protection method for power line |
| CN112821359B (en) * | 2020-12-25 | 2024-01-30 | 深圳供电局有限公司 | Protection system for electric line, circuit breaker and protection method for electric line |
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