CN203166476U - Low-voltage power distribution equipment protection device - Google Patents
Low-voltage power distribution equipment protection device Download PDFInfo
- Publication number
- CN203166476U CN203166476U CN 201320189379 CN201320189379U CN203166476U CN 203166476 U CN203166476 U CN 203166476U CN 201320189379 CN201320189379 CN 201320189379 CN 201320189379 U CN201320189379 U CN 201320189379U CN 203166476 U CN203166476 U CN 203166476U
- Authority
- CN
- China
- Prior art keywords
- low
- circuit
- transformer
- temperature
- overload
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a low-voltage power distribution equipment protection device and belongs to the technical field of low-voltage power distribution equipment protection device structures. The low-voltage power distribution equipment protection device comprises a low-voltage main loop current transformer, an overload detection circuit, an overload acousto-optic alarm circuit, an inverse-time overload tripping circuit, a phase failure and phase sequence protector, a transformer temperature sensor, a double-loop temperature control instrument, an over-temperature tripping protection driving circuit, an automatic air-cooled temperature control driving circuit, a cooling fan and a main loop alternating-current contactor coil control circuit. With the low-voltage power distribution equipment protection device, load and temperature states of a power distribution transformer can be monitored in real time, and overload detection, alarming and tripping protection on the power distribution transformer as well as automatic air-cooled temperature control and over-temperature tripping protection on the power distribution transformer are realized.
Description
Technical field
The utility model relates to a kind of low-voltage distribution apparatus protective device, belongs to low-voltage distribution apparatus protective device technical field of structures.
Background technology
Along with the production-scale continuous expansion of vast power consumer, power load also increases day by day; The peak, implementing in full of paddy tou power price policy, make many users carry out the concentrated electricity consumption of avoiding the peak hour, caused user's controller switching equipment the overload operation phenomenon often to occur, add that controller switching equipment year is aging for a long time, the fusing of high pressure fall insurance often takes place, the distribution disconnecting link burns out, the low-voltage distribution fuse melting, major loop ac contactor coil and contact burn, distribution transformer overload such as burns at accident, when causing controller switching equipment to damage, also the security of operation of user power utilization device security and power supply enterprise's electrical network is arrived in serious threat, even brings the situations of being discord such as responsibility dispute of compensation for damages aspect for user and power supply enterprise.
Common low-voltage distribution apparatus is made up of distribution transformer and low-voltage distribution panel usually; by high voltage drop-out type fuse cutout the transformer high-voltage side is implemented protection; the RTO low-tension fuse is implemented the protection of low-pressure side major loop, and big Capacity AC Contactor or low-voltage circuit breaker are finished the make-break operation of low pressure major loop.These protections can only simply be protected more serious overcurrent or short trouble, when the misphase that transformer high-voltage side or low-pressure side commutation cause takes place; The high pressure drop out fuse falls, the ablation of major loop knife switch, RTO fuse blows, A.C. contactor main contacts are ablated and situation such as other loose contacts when causing phase shortage, can not in time stop power supply, often cause the damage of controller switching equipment and user power utilization equipment.There is the big and serious phenomenon of heating of running noises in the long-term on-line operation of big Capacity AC Contactor, pull-in winding often takes place burn out the power outage that causes, and has also wasted a large amount of electric energy simultaneously, does not reach the purpose of safety, economy, reliability service.To this, we have developed a kind of low-voltage distribution apparatus protective device, controller switching equipment are effectively protected, to reduce the generation of above-mentioned accident.
Summary of the invention
The purpose of this utility model is to solve the deficiency that above-mentioned prior art exists, and a kind of overload-alarm of distribution transformer and low-voltage distribution apparatus protective device of trip protection, automatic air-cooled temperature control and the automatic power-off protection of overtemperature, phase shortage and fault-phase protection and silent power-saving protection realized is provided.
A kind of low-voltage distribution apparatus protective device of the present utility model, special character is to comprise the low pressure main circuit current instrument transformer 1 of gathering three-phase current signal, detects the overload detection circuit 2 of amplified current signal, the phase shortage that detects protection phase shortage and misphase state, phase sequence relay 5, detect the transformer temperature sensor 7 of transformer temperature, relatively amplify the double loop temperature controller 8 of temperature signal, and the direct current signal after described overload detection circuit 2 will change divides two-way to be sent to overload sound light alarming circuit 3 and inverse time lag overload trip circuit 4; Described double loop temperature controller 8 divides two-way to be sent to overtemperature trip protection drive circuit 9 and the automatic air-cooled temperature control drive circuit 10 of controlling cooling blower 11 start and stop the temperature signal after the comparative analysis; Described inverse time lag overload trip circuit (4), phase shortage, phase sequence relay 5, overtemperature trip protection drive circuit 9, direct control connection major loop ac contactor coil control circuit 12 respectively.
Described low-voltage distribution apparatus protective device also comprises quiet electricity economizer 6, directly control connection major loop ac contactor coil control circuit 12.
The direct current signal that described overload sound light alarming circuit 3 receives and the overloading threshold of setting relatively during greater than threshold value, send acousto-optic overload-alarm signal.
The direct current signal that described inverse time lag overload trip circuit 4 receives and the trip threshold of setting compare, and during greater than threshold value, control connection major loop ac contactor coil control circuit 12 trips to have a power failure and operates.
Described phase shortage, phase sequence relay 5, to A.C. contactor and before phase shortage and the misphase of high-low pressure major loop detect, when detecting phase shortage or misphase, control connection major loop ac contactor coil control circuit 12 operation that has a power failure of tripping.
The temperature signal that described overtemperature trip protection drive circuit 9 receives and the overtemperature threshold ratio of setting, during greater than threshold value, control connection major loop ac contactor coil control circuit 12 trips to have a power failure and operates.
The temperature signal that described automatic air-cooled temperature control drive circuit 10 receives and the bound temperature control threshold ratio of setting during greater than upper limit threshold, are controlled cooling blower 11 and are started, and during less than lower threshold, control cooling blower 11 stops.
Described phase shortage, phase sequence relay 5 connect samples in A.C. contactor or low-voltage circuit breaker lower end.
Described transformer temperature sensor 7 is mounted on the distribution transformer upper case, and does good heat conduction and windproof processing, is used for gathering the transformer temperature.
A kind of low-voltage distribution apparatus protective device of the utility model, can monitor load and the state of temperature of distribution transformer in real time, overload detection, warning and the trip protection of distribution transformer have been realized, and the automatic air-cooled temperature control of distribution transformer and overtemperature trip protection, protected the security of operation of transformer; Can implement reliably protecting for phase shortage and the misphase of A.C. contactor or low-voltage circuit breaker and the generation of high and low pressure major loop before, guarantee low-voltage distribution apparatus and user's power consumption equipment safety; Simultaneously, adopt quiet electricity economizer to realize the silent power-saving of A.C. contactor is protected, saves energy reaches more than 90%, has effectively eliminated running noises and the contact chatter phenomenon of A.C. contactor, has prolonged service life of equipment greatly, has improved power supply reliability.
Description of drawings
Fig. 1: the structural representation of a kind of low-voltage distribution apparatus protective device of the utility model;
Among the figure: 1: low pressure main circuit current instrument transformer; 2: overload detection circuit; 3: the overload sound light alarming circuit; 4: the inverse time lag overload trip circuit; 5: phase shortage, phase sequence relay; 6: quiet electricity economizer; 7: the transformer temperature sensor; 8: the double loop temperature controller; 9: overtemperature trip protection drive circuit; 10: automatic air-cooled temperature control drive circuit; 11: cooling blower; 12: major loop ac contactor coil control circuit.
Embodiment
Following with reference to accompanying drawing, provide embodiment of the present utility model, be used for formation of the present utility model is further specified.
Embodiment 1
A kind of low-voltage distribution apparatus protective device of present embodiment, by the low pressure main circuit current instrument transformer 1 that is installed on the low-voltage distribution panel inlet wire, gather the three-phase current signal of major loop, detect amplification through overload testing circuit 2, and converting corresponding direct current signal to, route overload sound light alarming circuit 3 compares with the overloading threshold of setting, during greater than threshold value, send acousto-optic overload-alarm signal, the caution user must reduce load; Another route inverse time lag overload trip circuit 4 compares with the trip threshold of setting; during greater than threshold value, output trip signal, control major loop ac contactor coil control circuit 12; realize the tripping operation power-failure protecting, transformer and the controller switching equipment of avoiding overload to cause damage.Inverse time lag overload trip circuit 4 can effectively be avoided the frequent tripping operation that moment transships or other interference cause, and strengthens the reliability of protective device.
Phase shortage, phase sequence relay 5 connect samples in the A.C. contactor lower end, to A.C. contactor and phase shortage and the misphase detection of high and low pressure major loop before, when the phase shortage that phase sequence change, the fusing of high pressure fall insurance etc. cause takes place in the high-pressure side; When the misphase that the change of low-pressure side generation phase sequence, the ablation of major loop knife switch, RTO fuse blows, the ablation of A.C. contactor main contacts and other loose contact phenomenons cause or phase shortage; phase shortage, phase sequence relay 5 be control major loop ac contactor coil control circuit 12 automatically; realize the tripping operation power-failure protecting, avoid the controller switching equipment that causes because of misphase, phase shortage and the damage of user power utilization equipment.
The major loop A.C. contactor is implemented silent power-saving control, quiet electricity economizer 6 is installed, control major loop ac contactor coil control circuit 12, interchange adhesive, the hold mode of A.C. contactor routine are become low-voltage direct adhesive, hold mode, effectively eliminate operation noise, contact shake and the coil heating phenomenon of A.C. contactor, with saves energy, prolong the useful life of A.C. contactor.
At distribution transformer top close installation transformer temperature sensor 7, and do corresponding heat conduction and windproof processing, with the temperature of effective detection transformer; Double loop temperature controller 8 amplifies processing with its detected temperature signal, respectively with the temperature control of setting and the two limit of overtemperature threshold ratio, one the tunnel outputs to automatic air-cooled temperature control drive circuit 10, automatically the start and stop of control cooling blower 11, cooling blower 11 is mounted on by the transformer, be beneficial to heat radiation and guarantee safe distance the position.Another road outputs to overtemperature trip protection drive circuit 9, and control major loop ac contactor coil control circuit 12 is realized the tripping operation power-failure protecting.Automatic air-cooled temperature control mode has improved the operational environment of transformer greatly, has delayed the ageing of insulation of transformer, has reduced the loss of transformer.Overtemperature trip protection function has been guaranteed the use safety of transformer to have reduced the grid power blackout accident that the transformer excess temperature burns and causes.
The low-voltage distribution apparatus mesolow switchboard of present embodiment adopts low-voltage circuit breaker to carry out break-make and protection, and the low-voltage distribution apparatus protective device need not to install quiet electricity economizer 6, and phase shortage, phase sequence relay 5 connect and sample in the low-voltage circuit breaker lower end.Remaining circuit and execution mode are with embodiment 1.
A kind of low-voltage distribution apparatus protective device of the utility model, the useful technique effect that compared with prior art can reach:
1. conventional low voltage distribution transformer is protected, and just in the high-pressure side of transformer high-voltage explosion fuse is installed usually; In low-pressure side low-tension fuse or on-load switch enforcement protection are installed, can not provide overload and overheat protector accurately for transformer.The utility model can be monitored load and the state of temperature of distribution transformer in real time, has realized overload detection, warning and the trip protection of distribution transformer, and the automatic air-cooled temperature control of distribution transformer and overtemperature trip protection.Significantly reduce the interruption of service of transformer, prolonged the useful life of transformer, improved power supply reliability.
2. Chang Gui low-voltage distribution panel can not be implemented reliably protecting to phase shortage, the misphase of high pressure and the generation of low pressure major loop, and the accident that controller switching equipment and power consumption equipment damage because of phase shortage, misphase often takes place.The utility model can be implemented reliably protecting for phase shortage and the misphase of A.C. contactor and high and low pressure major loop generation before, has guaranteed low-voltage distribution apparatus and user's power consumption equipment safety.
3. common low-voltage distribution panel, usually adopt the break-make of big Capacity AC Contactor control low pressure major loop, and the big long-term on-line operation of Capacity AC Contactor, phenomenon such as have that running noises is big, contact chatter and heating are serious, the power outage that pull-in winding burns out, contact is ablated and seriously caused often takes place, also have simultaneously more serious waste of energy problem, do not reach safety, economical, move purpose reliably.The utility model has been realized the silent power-saving protection to A.C. contactor, and saves energy reaches more than 90%, has effectively eliminated running noises and the contact chatter phenomenon of A.C. contactor, has prolonged service life of equipment greatly, has improved power supply reliability.
Claims (9)
1. low-voltage distribution apparatus protective device, it is characterized in that, comprise the low pressure main circuit current instrument transformer (1) of gathering three-phase current signal, detect the overload detection circuit (2) of amplified current signal, detect the phase shortage of protection phase shortage and misphase state, phase sequence relay (5), detect the transformer temperature sensor (7) of transformer temperature, relatively amplify the double loop temperature controller (8) of temperature signal, the direct current signal after described overload detection circuit (2) will be changed divides two-way to be sent to overload sound light alarming circuit (3) and inverse time lag overload trip circuit (4); Described double loop temperature controller (8) divides two-way to be sent to overtemperature trip protection drive circuit (9) and the automatic air-cooled temperature control drive circuit (10) of controlling cooling blower (11) start and stop the temperature signal after the comparative analysis; Described inverse time lag overload trip circuit (4), phase shortage, phase sequence relay (5), overtemperature trip protection drive circuit (9) be direct control connection major loop ac contactor coil control circuit (12) respectively.
2. a kind of low-voltage distribution apparatus protective device as claimed in claim 1 is characterized in that, described low-voltage distribution apparatus protective device also comprises quiet electricity economizer (6), directly control connection major loop ac contactor coil control circuit (12).
3. a kind of low-voltage distribution apparatus protective device as claimed in claim 1 is characterized in that, the direct current signal that described overload sound light alarming circuit (3) receives and the overloading threshold of setting relatively during greater than threshold value, send acousto-optic overload-alarm signal.
4. a kind of low-voltage distribution apparatus protective device as claimed in claim 1; it is characterized in that; the direct current signal that described inverse time lag overload trip circuit (4) receives and the trip threshold of setting are relatively; during greater than threshold value, control connection major loop ac contactor coil control circuit (12) trips to have a power failure and operates.
5. a kind of low-voltage distribution apparatus protective device as claimed in claim 1; it is characterized in that; described phase shortage, phase sequence relay (5); reaching before to A.C. contactor, phase shortage and the misphase of high-low pressure major loop detect; when detecting phase shortage or misphase, control connection major loop ac contactor coil control circuit (12) trips to have a power failure and operates.
6. a kind of low-voltage distribution apparatus protective device as claimed in claim 1; it is characterized in that; the temperature signal that described overtemperature trip protection drive circuit (9) receives and the overtemperature threshold ratio of setting are; during greater than threshold value, control connection major loop ac contactor coil control circuit (12) trips to have a power failure and operates.
7. a kind of low-voltage distribution apparatus protective device as claimed in claim 1; it is characterized in that; the temperature signal that described automatic air-cooled temperature control drive circuit (10) receives and the bound temperature control threshold ratio of setting are; during greater than upper limit threshold; control cooling blower (11) starts; during less than lower threshold, control cooling blower (11) stops.
8. a kind of low-voltage distribution apparatus protective device as claimed in claim 1 is characterized in that, described phase shortage, phase sequence relay (5) connect samples in the A.C. contactor lower end or the low-voltage circuit breaker lower end.
9. a kind of low-voltage distribution apparatus protective device as claimed in claim 1 is characterized in that, described transformer temperature sensor (7) is mounted on the distribution transformer upper case, gathers the transformer temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320189379 CN203166476U (en) | 2013-04-16 | 2013-04-16 | Low-voltage power distribution equipment protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320189379 CN203166476U (en) | 2013-04-16 | 2013-04-16 | Low-voltage power distribution equipment protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166476U true CN203166476U (en) | 2013-08-28 |
Family
ID=49027636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320189379 Expired - Fee Related CN203166476U (en) | 2013-04-16 | 2013-04-16 | Low-voltage power distribution equipment protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203166476U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319886A (en) * | 2019-07-24 | 2019-10-11 | 国网河南省电力公司漯河供电公司 | Match net state real-time information collection and fault diagnosis system based on cloud computing |
-
2013
- 2013-04-16 CN CN 201320189379 patent/CN203166476U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319886A (en) * | 2019-07-24 | 2019-10-11 | 国网河南省电力公司漯河供电公司 | Match net state real-time information collection and fault diagnosis system based on cloud computing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201966578U (en) | Arc extinguishing type electrical fireproof short circuit protection device | |
| CN102005720B (en) | Neutral line breakage detection protection method and device | |
| CN202663087U (en) | Smart protector for motor | |
| CN103414167A (en) | State detection and protection method for circuit breaker opening and closing coil | |
| CN203387160U (en) | Draught fan control circuit of high voltage frequency converter | |
| CN103701091A (en) | Electric leakage controller for circuit breaker | |
| CN203166476U (en) | Low-voltage power distribution equipment protection device | |
| CN208479171U (en) | A kind of threephase motor temperature control light current and forceful electric power isolation circuit | |
| CN201616596U (en) | Single-phase intelligent type alternating-current distribution box | |
| CN201051656Y (en) | High-power power transformer temperature detection and overload protector | |
| CN203434597U (en) | Motor overheating delay protection self-lock device | |
| CN203260995U (en) | Single-phase safety electricity-using appliance | |
| CN203434104U (en) | Air switch capable of being connected with sensor | |
| CN103489723A (en) | Air switch capable of being connected with sensor | |
| CN201444469U (en) | Automatic air switch with temperature protection function | |
| CN212992230U (en) | Saw cut motor and prevent overload overheat burnout detection device | |
| CN203434594U (en) | Motor overheating delay protection device | |
| CN113300363A (en) | Safe power utilization device | |
| CN204103785U (en) | Silicon rectifier draw-gear | |
| CN202678938U (en) | Motor overload protection circuit for motor-driven oil well pump | |
| CN201797292U (en) | Reverse power relay with overcurrent | |
| CN201904601U (en) | Multifunctional three-phase circuit breaker | |
| CN201797299U (en) | Reverse-power relay | |
| CN102769449A (en) | Digital air switch | |
| CN203135419U (en) | Integrated distribution box controlling apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20160416 |