CN206471821U - Low-voltage network neutral line break detects protection device - Google Patents
Low-voltage network neutral line break detects protection device Download PDFInfo
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- CN206471821U CN206471821U CN201720132835.1U CN201720132835U CN206471821U CN 206471821 U CN206471821 U CN 206471821U CN 201720132835 U CN201720132835 U CN 201720132835U CN 206471821 U CN206471821 U CN 206471821U
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- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000004520 electroporation Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
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Abstract
The utility model is related to electroporation field, it is a kind of low-voltage network neutral line break detection protection device, it includes control module and A.C. contactor, the three-phase firewire and zero line of low-voltage network are electrically connected with four voltage transformers respectively, control module is electrically connected with three relays respectively, the first lead-out terminal of outlet connecting terminal block is electrically connected with the first wiring contact of A.C. contactor control coil, the the second wiring contact and the earth of A.C. contactor control coil are electrically connected, the side of the normally opened main contact of A.C. contactor is electrically connected with zero line, the opposite side of the normally opened main contact of A.C. contactor and the electrical connection of temporary grounding end, control module and communication module two-way communication link.The utility model is after control module judges neutral line break, A.C. contactor connects zero line with temporary grounding point, it ensure that the stable operation under rated voltage of neutral line break region electrical equipment, the information such as neutral line break failure are sent to relevant staff simultaneously, relevant staff is overhauled.
Description
Technical field
The utility model is related to electroporation field, is a kind of low-voltage network neutral line break detection protection device.
Background technology
It is negative in three-phase if zero line disconnects for some reason in low voltage three-phase four-wire system system or in three-phase five-wire mode electric power system
In the case of lotus is uneven, user side neutral point voltage will shift, and this will cause each phase voltage to distort, and make the electricity of each phase load
Reduce off-flavor often, i.e., makes every two-phase load in series formation loop by the zero line of disconnection, and such electrical equipment will bear line voltage, due to
Each phase load is extremely difficult to balance, the small equipment of load impedance, which will bear voltage, in series circuit to reduce, and load impedance is big
Equipment, which bears voltage, to be raised, and the equipment will be damaged when more than electrical equipment rated voltage；There is part electricity consumption to set in addition
For by the way of zero line protection, this mode does not have protective effect not only, device housings can be made powered on the contrary, equivalent to band
Phase voltage, once these electrical appliance enclosures of human contact, will result in electric shock injures and deaths；Occur simultaneously in neutral line break failure
Afterwards, because failure can not be repaired in time, the loss meeting continuous enlargement caused to user brings bigger to people's life and property
Loss.
The content of the invention
The utility model provides a kind of low-voltage network neutral line break and detects protection device, overcomes above-mentioned prior art
Deficiency, it can effectively solve to overhaul after neutral line break to cause the electrical equipment in fault coverage to be damaged and failure not in time
The problem of information can not be sent to relevant staff in time.
The technical solution of the utility model is realized by following measures：A kind of low-voltage network neutral line break detection
Protection device, including casing, low-voltage network a phase firewires, b phase firewires, c phase firewires and zero line and be arranged in casing
Switch, control module, voltage transformer, AC/DC converters, outlet connecting terminal block, relay, communication module and ac contactor
Device, a phase firewires, b phase firewires, c phase firewires and the zero line of low-voltage network by switch respectively with first voltage transformer, second
The first binding post electrical connection of voltage transformer, tertiary voltage transformer and the 4th voltage transformer input, first voltage is mutual
Second binding post of sensor and the 4th voltage transformer input is electrically connected with the earth respectively, second voltage transformer and the 3rd electricity
Second binding post of pressure transformer input is electrically connected with zero line respectively, first voltage transformer, second voltage transformer, the 3rd
The output end of voltage transformer and the 4th voltage transformer first input end respectively with control module, the second input, the 3rd
Input and the electrical connection of the 4th input, the first output end of control module, the second output end, the 3rd output end are respectively with first
The control coil electrical connection of relay, the second relay and the 3rd relay, the first relay, the second relay and the 3rd relay
The normally open contact of device is electrically connected with exporting first input end, the second input terminal, the 3rd input terminal of connecting terminal block respectively
Connect, the first lead-out terminal of outlet connecting terminal block is electrically connected with the first wiring contact of A.C. contactor control coil, is exchanged
Second wiring contact of contactor control coil is electrically connected with the earth, and the side of the normally opened main contact of A.C. contactor is electrically connected with zero line
Connect, the opposite side of the normally opened main contact of A.C. contactor and the electrical connection of temporary grounding end, control module and communication module two-way communication
Connection, the input of AC/DC converters is electrically connected with a phase firewires and zero line respectively, output end and the control mould of AC/DC converters
The 5th input electrical connection of block.
Here is the further optimization and/or improvements to above-mentioned utility model technical scheme：
The above-mentioned voltage transformer connecting terminal block and the 5th voltage transformer for also including being arranged in casing, low-voltage distribution
First input of a phase firewires, b phase firewires, c phase firewires and the zero line of net by switch respectively with voltage transformer connecting terminal block
Terminal, the second input terminal, the 3rd input terminal and the electrical connection of the 4th input terminal, the first of voltage transformer connecting terminal block
Lead-out terminal, the second lead-out terminal, the 3rd lead-out terminal, the 4th lead-out terminal and the 5th lead-out terminal are mutual with first voltage respectively
Sensor, second voltage transformer, tertiary voltage transformer, the first of the 4th voltage transformer and the 5th voltage transformer input
Binding post is electrically connected, the second binding post of first voltage transformer, the 4th voltage transformer and the 5th voltage transformer input
Electrically connected respectively with the earth, the second binding post of second voltage transformer and tertiary voltage transformer input is electric with zero line respectively
Connection, first voltage transformer, second voltage transformer, tertiary voltage transformer, the 4th voltage transformer and the 5th voltage are mutual
First input end, the second input, the 3rd input, the 4th input and the 6th of the output end of sensor respectively with control module
Input is electrically connected.
It is above-mentioned also to include being arranged on standby power supply module and alarm module in casing, the output end of standby power supply module with
The 7th input electrical connection of control module, the input of alarm module is electrically connected with the 4th output end of control module.
Above-mentioned standby power supply module is battery.
It is above-mentioned also to include mobile communication terminal, mobile communication terminal and communication module two-way communication link.
Above-mentioned communication module is 3G wireless communication modules or 4G wireless communication modules.
The utility model reasonable and compact in structure, it is easy to use, when control module judges to occur neutral line break, control mould
Block is exported certain phase voltage in a phase firewires, b phase firewires, c phase firewires of low-voltage network to A.C. contactor by relay
Control coil, loop is constituted with the earth, so as to control the normally opened main contact closure of A.C. contactor, zero line and temporary grounding are terminated
It is logical, so as to quick detection and repair failure, make troubleshooting time control within 100ms, it is ensured that in the range of neutral line break
Related electrical equipment can be in stable operation under rated voltage, it is ensured that electrical equipment is not damaged by, so as to avoid neutral line break event
A series of generation of the caused electrical equipment accidents of barrier；Neutral line break fault message is sent to work by communication module simultaneously
On the mobile communication terminal of personnel, relevant staff is set to know fault message the very first time and be overhauled in time, it is to avoid zero
The loss that line disconnection fault is caused to user.
Brief description of the drawings
Accompanying drawing 1 is the circuit connection signal block diagram of the utility model most preferred embodiment.
Embodiment
The utility model is not limited by following embodiments, can according to the technical solution of the utility model and actual conditions come
Determine specific embodiment.
The utility model is further described with reference to embodiment and accompanying drawing：
As shown in Figure 1, low-voltage network neutral line break detection protection device includes casing, a phases of low-voltage network
Live wire, b phase firewires, c phase firewires and zero line and the switch being arranged in casing, control module, voltage transformer, AC/DC turn
Parallel operation, outlet connecting terminal block, relay, communication module and A.C. contactor, a phase firewires, b phase firewires, the c of low-voltage network
Phase firewire and zero line by switch respectively with first voltage transformer, second voltage transformer, tertiary voltage transformer and the 4th
The second of the first binding post electrical connection of voltage transformer input, first voltage transformer and the 4th voltage transformer input
Binding post is electrically connected with the earth respectively, the second binding post of second voltage transformer and tertiary voltage transformer input respectively with
Zero line is electrically connected, first voltage transformer, second voltage transformer, the output of tertiary voltage transformer and the 4th voltage transformer
First input end, the second input, the 3rd input and the 4th input of end respectively with control module are electrically connected, control module
The first output end, the second output end, the control of the 3rd output end respectively with the first relay, the second relay and the 3rd relay
Coil electrical connection processed, the normally open contact of the first relay, the second relay and the 3rd relay is respectively with exporting connecting terminal block
First input end, the second input terminal, the 3rd input terminal electrical connection, export connecting terminal block first lead-out terminal with
The first wiring contact electrical connection of A.C. contactor control coil, the second wiring contact and the earth of A.C. contactor control coil
Electrical connection, the side of the normally opened main contact of A.C. contactor electrically connects with zero line, the opposite side of the normally opened main contact of A.C. contactor with
Temporary grounding end is electrically connected, control module and communication module two-way communication link, the inputs of AC/DC converters respectively with a phases
Live wire and zero line electrical connection, the output end of AC/DC converters are electrically connected with the 5th input of control module.
Here, switch, control module, voltage transformer, outlet connecting terminal block, relay, communication module are connect with exchanging
Tentaculum is unified to be arranged on box house, can effective rain-proof, protection against the tide, dust-proof, it is ensured that safe and stable operation of the present utility model.
Here, control module is existing known technology, is 32 MCU processors.Communication module is existing known technology, energy
Neutral line break fault message in control module is sent at relevant staff, relevant staff is known the very first time
Neutral line break fault message simultaneously overhauled in time, it is to avoid the loss caused due to neutral line break failure to user.AC/DC turns
Parallel operation is existing known technology, alternating current can be converted to direct current, so as to be powered for control module.Voltage transformer is
Single-phase potential transformer, plays a part of voltage transformation, first voltage transformer, second voltage transformer, tertiary voltage mutual inductance
Device and the 4th voltage transformer are control the voltage conversion of a phase firewires of low-voltage network, b phase firewires, c phase firewires and zero line
Module can carry out the voltage of A/D sampled measurements；A.C. contactor is existing known technology, the one of the normally opened main contact of A.C. contactor
Side is normally opened main contact T1, T2, T3；The opposite side of normally opened main contact is normally opened main contact L1, L2, L3.
Here, the first output end of control module, the second output end, the 3rd output end respectively with the first relay, second
The control coil electrical connection of relay and the 3rd relay, the first relay, the second relay and the normally opened of the 3rd relay touch
Point is electrically connected with exporting three input terminals of connecting terminal block respectively, exports the first lead-out terminal of connecting terminal block with exchanging
The winding wiring contact electrical connection of contactor；Its middle outlet connecting terminal block above-mentioned to enter a connecting terminal block out more
The first output end output of control module is a phase firewire voltages in connection, and the output of the second output end is b phase firewire voltages,
The output of 3rd output end is c phase firewire voltages, and control module is defeated by the first output end and the first relay under normal circumstances
Go out a phase firewires voltage and control normally opened main contact closure into A.C. contactor, can not be exported if a phase firewires voltage breaks down,
B phase firewires voltage is then exported by the second output end and the second relay and enters the normally opened main contact closure of A.C. contactor control,
If b phase firewires voltage breaks down and can not exported, c phase firewires voltage is exported by the 3rd output end and the 3rd relay and entered
A.C. contactor controls normally opened main contact closure.
During work, voltage, a phase firewire pair of the control module to a phase firewires of the low-voltage network of input to zero line first
Voltage, the b phase firewires of the earth are carried out respectively to voltage, the c phase firewires of zero line to the voltage and zero line of zero line to the voltage of the earth
A/D sampled measurements, then accurately calculate live wire to neutral voltage, live wire to big ground voltage by control module, then
Measuring and calculating value is compared with pre-set predetermined value in the control module, when the live wire calculated to neutral voltage in 220V
During ± 20% scope, then do not occur neutral line break, A.C. contactor is failure to actuate；When live wire to neutral voltage more than 220V ± 20%
During scope, and live wire to big ground voltage in 220V ± 20% scopes, neutral point excursion now is calculated by control module
When voltage, such as neutral excursion voltage exceed pre-set setting value in the control module, then it is judged as that occurring zero line breaks
Line failure, now control module is mutually electric by certain in a phase firewires, b phase firewires, c phase firewires of low-voltage network by relay
Pressure output constitutes loop to A.C. contactor control coil with the earth, so as to control the normally opened main contact closure of A.C. contactor, makes
Zero line is connected with temporary grounding point, so as to quick detection and repair failure, makes troubleshooting time control within 100ms, has
Effect ensure that the related electrical equipment in the range of neutral line break can be in stable operation under rated voltage, it is ensured that electrical equipment not by
Damage, it is to avoid a series of generation of electrical equipment accidents caused by neutral line break failure；Neutral line break fault message can simultaneously
To be sent to by communication module at relevant staff, relevant staff is set to know neutral line break fault message the very first time
And overhauled in time, so as to avoid the loss caused by neutral line break failure to user.
Can according to actual needs, to above-mentioned low-voltage network neutral line break detect protection device, make further optimization or/and
Improve：
As shown in Figure 1, in addition to the voltage transformer connecting terminal block and the 5th voltage transformer that are arranged in casing,
A phase firewires, b phase firewires, c phase firewires and the zero line of low-voltage network by switch respectively with voltage transformer connecting terminal block
First input end, the second input terminal, the 3rd input terminal and the electrical connection of the 4th input terminal, voltage transformer binding post
The first lead-out terminal of row, the second lead-out terminal, the 3rd lead-out terminal, the 4th lead-out terminal and the 5th lead-out terminal are respectively with
One voltage transformer, second voltage transformer, tertiary voltage transformer, the 4th voltage transformer and the input of the 5th voltage transformer
The first binding post electrical connection at end, first voltage transformer, the of the 4th voltage transformer and the 5th voltage transformer input
Two binding posts are electrically connected with the earth respectively, the second binding post difference of second voltage transformer and tertiary voltage transformer input
Electrically connected with zero line, first voltage transformer, second voltage transformer, tertiary voltage transformer, the 4th voltage transformer and
The output end of five voltage transformers first input end respectively with control module, the second input, the 3rd input, the 4th input
End and the electrical connection of the 6th input.Here, the 4th input terminal two lead-out terminals of correspondence of voltage transformer connecting terminal block
That is the 4th lead-out terminal and the 5th lead-out terminal, then the 4th lead-out terminal and the 5th lead-out terminal electrically connected with zero line, here
Add the 5th voltage transformer and add neutral voltage sampled measurements circuit all the way, it is ensured that it is reliable that voltage sample is measured
Property.
As shown in Figure 1, in addition to the standby power supply module and alarm module that are arranged in casing, standby power supply module
Output end is electrically connected with the 7th input of control module, and the input of alarm module and the 4th output end of control module are electrically connected
Connect.Alarm module is audible-visual annunciator, can be alarmed using alarm module when occurring neutral line break, point out related work people
Neutral line break failure occurs for member.Also fault message can be sent to related work in grid cut-off using standby power supply module
Personnel.
As needed, standby power supply module is battery.
As shown in Figure 1, in addition to mobile communication terminal, mobile communication terminal and communication module two-way communication link.This
In mobile communication terminal be staff it is hand-held the mobile device of control software, such as mobile phone, tablet personal computer can be installed
Deng；Neutral line break fault message can be transmitted to the mobile communication terminal of relevant staff by communication module, make correlation
Staff is known neutral line break fault message the very first time and overhauled in time.
As shown in Figure 1, the communication module is 3G wireless communication modules or 4G wireless communication modules.Here 3G channel radios
Believe that module or 4G wireless communication modules carry out information transfer, by the neutral line break transmitting fault information in control module to related work
Make at personnel, relevant staff is known neutral line break fault message the very first time and is overhauled in time.
Above technical characteristic constitutes most preferred embodiment of the present utility model, and it has stronger adaptability and optimal implementation
Effect, can increase and decrease non-essential technical characteristic according to actual needs, to meet the demand of different situations.
The course of work is as follows：
First control module to a phase firewires of the low-voltage network of input to the voltage of zero line, a phase firewires to the electricity of the earth
Pressure, b phase firewires carry out A/D sampling surveys to voltage, the c phase firewires of zero line respectively to the voltage and zero line of zero line to the voltage of the earth
Amount；Then live wire is accurately calculated by control module to neutral voltage, live wire to big ground voltage；Then measuring and calculating value with
Pre-set predetermined value is compared in control module, when the live wire calculated to neutral voltage in the scopes of 220V ± 20%
When, then do not occur neutral line break failure, A.C. contactor is failure to actuate；When live wire to neutral voltage more than the scopes of 220V ± 20%
When, and live wire to big ground voltage in 220V ± 20% scopes, by control module calculate now neutral point excursion electricity
Pressure, if neutral excursion voltage exceedes pre-set setting value in the control module, is judged as occurring neutral line break
Failure；Last control module is by relay by certain phase voltage in a phase firewires, b phase firewires, c phase firewires of low-voltage network
Output constitutes loop to A.C. contactor control coil with the earth, so that the normally opened main contact closure of A.C. contactor is controlled, by zero
Line connects reparation failure with temporary grounding point, while neutral line break failure is sent to relevant staff by communication module
Place.
Claims (10)
1. a kind of low-voltage network neutral line break detects protection device, it is characterised in that a phases fire including casing, low-voltage network
Line, b phase firewires, c phase firewires and zero line and the switch being arranged in casing, control module, voltage transformer, AC/DC conversions
Device, outlet connecting terminal block, relay, communication module and A.C. contactor, a phase firewires of low-voltage network, b phase firewires, c phases
Live wire and zero line are electric with first voltage transformer, second voltage transformer, tertiary voltage transformer and the 4th respectively by switch
The second of the first binding post electrical connection of pressure transformer input, first voltage transformer and the 4th voltage transformer input connects
Terminal is electrically connected with the earth respectively, and the second binding post of second voltage transformer and tertiary voltage transformer input is respectively with zero
Line is electrically connected, first voltage transformer, second voltage transformer, the output end of tertiary voltage transformer and the 4th voltage transformer
First input end, the second input, the 3rd input and the 4th input respectively with control module is electrically connected, control module
First output end, the second output end, the control of the 3rd output end respectively with the first relay, the second relay and the 3rd relay
Coil is electrically connected, and the normally open contact of the first relay, the second relay and the 3rd relay is respectively with exporting connecting terminal block
First input end, the second input terminal, the electrical connection of the 3rd input terminal, export first lead-out terminal and the friendship of connecting terminal block
Flow the first wiring contact electrical connection of contactor control coil, the second wiring contact and the earth electricity of A.C. contactor control coil
Connection, the side of the normally opened main contact of A.C. contactor electrically connects with zero line, the opposite side of the normally opened main contact of A.C. contactor with face
When earth terminal electrically connect, control module and communication module two-way communication link, the input of AC/DC converters are fiery with a phase respectively
Line and zero line electrical connection, the output end of AC/DC converters are electrically connected with the 5th input of control module.
2. low-voltage network neutral line break according to claim 1 detects protection device, it is characterised in that：Also include setting
Voltage transformer connecting terminal block and the 5th voltage transformer in casing, a phase firewires, b phase firewires, the c of low-voltage network
Phase firewire and zero line pass through switch first input end respectively with voltage transformer connecting terminal block, the second input terminal, the
Three input terminals and the electrical connection of the 4th input terminal, the first lead-out terminal of voltage transformer connecting terminal block, the second output end
Son, the 3rd lead-out terminal, the 4th lead-out terminal and the 5th lead-out terminal respectively with first voltage transformer, second voltage mutual inductance
Device, tertiary voltage transformer, the first binding post electrical connection of the 4th voltage transformer and the 5th voltage transformer input, first
Second binding post of voltage transformer, the 4th voltage transformer and the 5th voltage transformer input is electrically connected with the earth respectively,
Second binding post of second voltage transformer and tertiary voltage transformer input is electrically connected with zero line respectively, first voltage mutual inductance
Device, second voltage transformer, tertiary voltage transformer, the 4th voltage transformer and the 5th voltage transformer output end respectively with
The first input end of control module, the second input, the 3rd input, the 4th input and the electrical connection of the 6th input.
3. low-voltage network neutral line break according to claim 1 or 2 detects protection device, it is characterised in that：Also include
It is arranged on standby power supply module and alarm module in casing, the 7th input of the output end and control module of standby power supply module
End electrical connection, the input of alarm module is electrically connected with the 4th output end of control module.
4. low-voltage network neutral line break according to claim 3 detects protection device, it is characterised in that：The standby electricity
Source module is battery.
5. low-voltage network neutral line break according to claim 1 or 2 detects protection device, it is characterised in that：Also include
Mobile communication terminal, mobile communication terminal and communication module two-way communication link.
6. low-voltage network neutral line break according to claim 4 detects protection device, it is characterised in that：Also include movement
Communication terminal, mobile communication terminal and communication module two-way communication link.
7. low-voltage network neutral line break according to claim 1 or 2 detects protection device, it is characterised in that：It is described logical
Believe that module is 3G wireless communication modules or 4G wireless communication modules.
8. low-voltage network neutral line break according to claim 3 detects protection device, it is characterised in that：The communication mould
Block is 3G wireless communication modules or 4G wireless communication modules.
9. low-voltage network neutral line break according to claim 5 detects protection device, it is characterised in that：The communication mould
Block is 3G wireless communication modules or 4G wireless communication modules.
10. low-voltage network neutral line break according to claim 6 detects protection device, it is characterised in that：The communication
Module is 3G wireless communication modules or 4G wireless communication modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720132835.1U CN206471821U (en) | 2017-02-14 | 2017-02-14 | Low-voltage network neutral line break detects protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720132835.1U CN206471821U (en) | 2017-02-14 | 2017-02-14 | Low-voltage network neutral line break detects protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206471821U true CN206471821U (en) | 2017-09-05 |
Family
ID=59707738
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720132835.1U Expired - Fee Related CN206471821U (en) | 2017-02-14 | 2017-02-14 | Low-voltage network neutral line break detects protection device |
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| Country | Link |
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| CN (1) | CN206471821U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655140A (en) * | 2017-02-14 | 2017-05-10 | 国网新疆电力公司伊犁供电公司 | Zero line breakage detection protection device for low-voltage power distribution network |
| CN110618633A (en) * | 2019-09-26 | 2019-12-27 | 云南电网有限责任公司电力科学研究院 | Terminal box circuit maintenance system |
-
2017
- 2017-02-14 CN CN201720132835.1U patent/CN206471821U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655140A (en) * | 2017-02-14 | 2017-05-10 | 国网新疆电力公司伊犁供电公司 | Zero line breakage detection protection device for low-voltage power distribution network |
| CN110618633A (en) * | 2019-09-26 | 2019-12-27 | 云南电网有限责任公司电力科学研究院 | Terminal box circuit maintenance system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
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