CN108281939B - Neutral line breakage protection device with high safety for three-phase electricity - Google Patents
Neutral line breakage protection device with high safety for three-phase electricity Download PDFInfo
- Publication number
- CN108281939B CN108281939B CN201810229923.2A CN201810229923A CN108281939B CN 108281939 B CN108281939 B CN 108281939B CN 201810229923 A CN201810229923 A CN 201810229923A CN 108281939 B CN108281939 B CN 108281939B
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- phase
- power supply
- protection switch
- relay
- neutral line
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 35
- 230000005611 electricity Effects 0.000 title claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- 230000001131 transforming effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a three-phase electricity high-safety neutral line disconnection protection device which comprises a disconnection detection module, a control module, a power conversion output module and a protection switch, wherein the disconnection detection module is respectively connected with each phase line and each neutral line and is used for monitoring the connection and disconnection of each phase line and each neutral line, the control module is connected with the disconnection detection module and the power conversion output module and is used for receiving signals of the disconnection detection module and controlling the power conversion output module to carry out phase line switching, and the power conversion output module is used for selecting any two-phase power output to provide working power for the protection switch. The invention can monitor the disconnection of the neutral line or/and any phase line and start the protection switch to disconnect the power supply so as to protect the electrical equipment, has the functions of N disconnection and phase failure protection, and has extremely high safety.
Description
Technical Field
The invention relates to electrical safety protection equipment, in particular to a three-phase neutral line disconnection protection device.
Background
The neutral line breakage protection device is an important safety protection device of a power supply system, and the current three-phase neutral line breakage protection device is usually connected with any two phases of wires on a three-phase power supply to serve as a driving power supply, and when the neutral line breakage is detected, the protection switch is turned off to protect electric equipment. However, if any one of any two phase lines connected to the neutral line disconnection protecting device and the neutral line are disconnected at the same time, a driving power supply cannot be provided for the protecting switch, so that the neutral line disconnection protecting device fails, and the electrical safety is seriously affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-phase high-safety neutral line disconnection protection device which can monitor disconnection of any phase line and neutral line in real time and effectively drive a protection switch to work and has extremely high safety.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a high security neutral line broken string protection device of three-phase electricity, includes broken string detection module, control module, power conversion output module, protection switch, broken string detection module is connected with each phase line and neutral line respectively for monitor the break-make of each phase line and neutral line, control module is connected with broken string detection module, power conversion output module, is used for receiving broken string detection module's signal and controlling power conversion output module and carries out the phase line switching, power conversion output module's power input is connected with each phase line, power output is connected with protection switch for select arbitrary two-phase power output to provide working power supply for protection switch. The three-phase high-safety neutral line breakage protection device monitors the on-off of each phase line and each neutral line through the breakage detection module, receives and processes the on-off information number through the control module and controls the power supply conversion output module to carry out phase line switching so as to provide two-phase working power supplies for the protection switch, thereby achieving the safety protection of electric circuits.
Preferably, the working voltage of the protection switch is 220V, so that the protection switch can be conveniently selected.
Preferably, a transformer is arranged between the protection switch and the power conversion output module, and 380V power supply can be transformed according to the working voltage of the protection switch.
Preferably, the protection switch is a circuit breaker or a contactor, and can be selected and applied according to application environments.
Preferably, the power conversion output module is further provided with an alarm signal output end, so that the alarm device can be conveniently accessed.
Compared with the prior art, the three-phase power high-safety neutral line disconnection protection device has the beneficial effects that: the neutral line or/and any phase line can be monitored by the broken line detection module, the control module and the power conversion output module, and the protection switch is started to cut off power supply so as to protect electrical equipment, and the neutral line/phase line breaker has the functions of N breaking and phase loss protection and has extremely high safety.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a three-phase electrical high-safety neutral line disconnection protecting device of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
As shown in FIG. 1, the three-phase high-safety neutral line disconnection protection device comprises a disconnection detection module, a control module, a power conversion output module and a protection switch, wherein the disconnection detection module is respectively connected with each phase line and each neutral line and is used for monitoring the connection and disconnection of each phase line and each neutral line, the control module is connected with the disconnection detection module and the power conversion output module and is used for receiving signals of the disconnection detection module and controlling the power conversion output module to carry out phase line switching, and a power input end of the power conversion output module is connected with each phase line and a power output end of the power conversion output module is connected with the protection switch and is used for selecting any two-phase power output to provide working power for the protection switch. The invention relates to a three-phase high-safety neutral line disconnection protection device, wherein a first pair of terminals of a relay J1 are connected with an A phase of an input power supply and a first input end of a transformer, and a second pair of terminals of the relay J1 are connected with a B phase of the input power supply and a second input end of the transformer; a first pair of terminals of the relay J2 are connected with a B phase of an input power supply and a first input end of the transformer, and a second pair of terminals of the relay J2 are connected with a C phase of the input power supply and a second input end of the transformer; a first pair of terminals of the relay J3 is connected with a C phase of an input power supply and a first input end of the transformer, and a second pair of terminals of the relay J3 is connected with an A phase of the input power supply and a second input end of the transformer. When the phase A of the input power is detected to be broken, the control module drives the relay J2 to conduct and output the two-phase 380V working power supply to start the protection switch, when the phase B of the input power is detected to be broken, the control module drives the relay J3 to conduct and output the two-phase 380V working power supply to start the protection switch, when the phase C of the input power is detected to be broken, the control module drives the relay J1 to conduct and output the two-phase 380V working power supply to start the protection switch, and when the phase N of the input power is detected to be broken, the control module drives the relay J1 or J2 or J3 to conduct and output the two-phase 380V working power supply to start the protection switch.
As shown in fig. 1, in the three-phase electric high-safety neutral line disconnection protection device, the working voltage of the protection switch is 220V, a transformer is arranged between the protection switch and a power conversion output module, the protection switch is a circuit breaker or a contactor, and the power conversion output module is also provided with an alarm signal output end.
The above description is illustrative of the preferred embodiment of the present invention and is not intended to be limiting, but is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the present invention.
Claims (4)
1. A three-phase electricity high security neutral line broken wire protection device which characterized in that: the power supply switching device comprises a broken line detection module, a control module, a power supply switching output module and a protection switch, wherein the broken line detection module is respectively connected with each phase line and each neutral line and is used for monitoring the on-off of each phase line and each neutral line, the control module is connected with the broken line detection module and the power supply switching output module and is used for receiving signals of the broken line detection module and controlling the power supply switching output module to carry out phase line switching, and a power supply input end of the power supply switching output module is connected with each phase line and a power supply output end of the power supply switching output module is connected with the protection switch and is used for selecting any two-phase power supply output to provide working power supply for the protection switch;
a first pair of terminals of the relay J1 are connected with an A phase of an input power supply and a first input end of the transformer, and a second pair of terminals of the relay J1 are connected with a B phase of the input power supply and a second input end of the transformer; a first pair of terminals of the relay J2 are connected with a B phase of an input power supply and a first input end of the transformer, and a second pair of terminals of the relay J2 are connected with a C phase of the input power supply and a second input end of the transformer; a first pair of terminals of the relay J3 are connected with a C phase of an input power supply and a first input end of the transformer, and a second pair of terminals of the relay J3 are connected with an A phase of the input power supply and a second input end of the transformer;
when the phase A of the input power is detected to be broken, the control module drives the relay J2 to conduct and output a two-phase 380V working power supply to start the protection switch to work, when the phase B of the input power is detected to be broken, the control module drives the relay J3 to conduct and output the two-phase 380V working power supply to start the protection switch to work, when the phase C of the input power is detected to be broken, the control module drives the relay J1 or J2 or J3 to conduct and output the two-phase 380V working power supply to start the protection switch to work, and when the phase N of the input power is detected to be broken only, the control module drives the relay J1 or J2 or J3 to conduct and output the two-phase 380V working power supply to start the protection switch to work;
and a transformer is arranged between the protection switch and the power conversion output module and is used for transforming 380V power supply according to the working voltage of the protection switch.
2. The three-phase electrical high-safety neutral line disconnection protecting device according to claim 1, wherein: the working voltage of the protection switch is 220V.
3. The three-phase electric high-safety neutral line disconnection protecting device according to claim 1 or 2, characterized in that: the protection switch is a circuit breaker or a contactor.
4. The three-phase electrical high-safety neutral line disconnection protecting device according to claim 1, wherein: the power conversion output module is also provided with an alarm signal output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810229923.2A CN108281939B (en) | 2018-03-20 | 2018-03-20 | Neutral line breakage protection device with high safety for three-phase electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810229923.2A CN108281939B (en) | 2018-03-20 | 2018-03-20 | Neutral line breakage protection device with high safety for three-phase electricity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108281939A CN108281939A (en) | 2018-07-13 |
| CN108281939B true CN108281939B (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810229923.2A Active CN108281939B (en) | 2018-03-20 | 2018-03-20 | Neutral line breakage protection device with high safety for three-phase electricity |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205791462U (en) * | 2016-06-06 | 2016-12-07 | 国网天津市电力公司 | It is applicable to the transformator broken neutral line monitoring system of low-voltage network |
| CN106229936A (en) * | 2016-08-10 | 2016-12-14 | 国网浙江瑞安市供电有限责任公司 | The disconnected neutral conductor and the protection device of phase shortage |
| CN207926160U (en) * | 2018-03-20 | 2018-09-28 | 四川电之盾安全技术有限公司 | A kind of three-phase electricity high security broken neutral line protective device |
-
2018
- 2018-03-20 CN CN201810229923.2A patent/CN108281939B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205791462U (en) * | 2016-06-06 | 2016-12-07 | 国网天津市电力公司 | It is applicable to the transformator broken neutral line monitoring system of low-voltage network |
| CN106229936A (en) * | 2016-08-10 | 2016-12-14 | 国网浙江瑞安市供电有限责任公司 | The disconnected neutral conductor and the protection device of phase shortage |
| CN207926160U (en) * | 2018-03-20 | 2018-09-28 | 四川电之盾安全技术有限公司 | A kind of three-phase electricity high security broken neutral line protective device |
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| Publication number | Publication date |
|---|---|
| CN108281939A (en) | 2018-07-13 |
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