CN107634499A - Double-protection load switch fuse combined electrical apparatus and circuit structure - Google Patents
Double-protection load switch fuse combined electrical apparatus and circuit structure Download PDFInfo
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- CN107634499A CN107634499A CN201710901206.5A CN201710901206A CN107634499A CN 107634499 A CN107634499 A CN 107634499A CN 201710901206 A CN201710901206 A CN 201710901206A CN 107634499 A CN107634499 A CN 107634499A
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- 230000009977 dual effect Effects 0.000 abstract description 2
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Abstract
The invention relates to the technical field of distribution transformer protection, in particular to a dual-protection load switch fuse combined electrical apparatus and a circuit structure. The invention adds a comprehensive relay protection device and a current transformer on the basis of the traditional load switch fuse combined electrical appliance, and monitors the circuit current through the setting of the current transformer: when the load normally operates, the comprehensive relay protection device does not act; when an abnormal condition occurs, the comprehensive relay protection device realizes timing limit overcurrent protection on the outlet cabinet; when short-circuit fault occurs, the current of the circuit is suddenly increased by several times, the fuse fuses rapidly, the short-circuit fault is cut off, and the quick-break effect is achieved. The invention has low investment cost and low operation cost, overcomes the defect of low protection reaction speed of the circuit breaker and the problem that the traditional combined electrical appliance can not accurately determine the action value of the overload current and the fuse needs to be replaced after each protection action, and realizes the dual protection of the timing limit overcurrent protection and the quick-break protection of the outlet cabinet.
Description
Technical field
The present invention relates to the technical field of distribution transformer protection, melted more particularly, to a kind of double protection on-load switches
Disconnected device combined electrical apparatus and circuit structure.
Background technology
The relaying configuration of distribution transformer typically uses two kinds of breaker and on-load switch fuse combined electric apparatus at present, it
It is each variant in technology and economic aspect.Dry-type transformer capacity is no more than 800kVA, and oil-filled transformer capacity is no more than
630kVA, can be with configuration load switch fuse combined electrical apparatus；Dry-type transformer capacity 1000kVA and more than, oil immersed type transformation
Device capacity reach 800kVA and more than, must configuration breaker.
However, there is the shortcomings that reaction speed is slow in breaker protection：When oil-filled transformer short circuit occurred inside failure,
Short circuit current is very big, if can not cut off short trouble within 20 ms times, may result in the badly damaged of transformer；And
The switch off time of breaker is made up of three parts：Relay protection actuation time, breaker intrinsic actuation time and arc time,
Take more than 60 ms；Although visible break device has acted, because actuation time is still damaged more than 20 ms, transformer
It is bad；And breaker cost of investment is big, construction is complicated, must periodic inspection.Traditional on-load switch fuse combined electric apparatus is for mistake
Load current value belongs to Fuzzy Calculation, realizes fusing by fuse accumulation heat energy, it is impossible to precisely determine overload electric current working value；
And protection scheme operating cost is big, fuse must be changed after each protection act.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind can realize specified time excessively stream to outgoing line cabinet
With the on-load switch fuse combined electric apparatus and circuit structure of the double protections of quick-break.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of double protection on-load switch fuse combined electric apparatus are provided, including for realizing the synthesis relay of specified time overcurrent protection
Protection device, on-load switch, fuse and the current transformer for observation circuit electric current, the integrated technical reformation dress
Put, on-load switch, fuse, current transformer order electrically connect；Electric operating system is connected with the on-load switch, it is described
Comprehensive relay protection device includes specified time overcurrent protective device.
Double protection on-load switch fuse combined electric apparatus of the present invention, by the setting of comprehensive relay protection device to outlet
Cabinet realizes specified time overcurrent protection, and separating brake or combined floodgate are carried out to outgoing line cabinet by the setting of on-load switch；Pass through setting for fuse
Put, when fault current exceedes transfer current or take-over current, fuse is to be acted in 10 ms in first half-wave, fuse
Fusing, cuts off short trouble, and responsiveness is faster than the ms of actuation time 60 of breaker；Monitored by the setting of current transformer
Circuital current, when circuital current reaches specified time overcurrent value, triggering comprehensive relay protection device action, tripping on-load switch；
Realize to the specified time overcurrent protection of outgoing line cabinet and the duplicate protection of fast tripping protection.Electric operating system realizes electronic disconnection or conjunction
Load switch, during operation, both can manual division on-load switch, again can be with electronic division on-load switch.
Preferably, the comprehensive relay protection device include the first comprehensive relay protection device FA1 of electrical connection in parallel with
And the second comprehensive relay protection device FA2.Comprehensive relay protection device can realize specified time overcurrent protection to outgoing line cabinet.
Preferably, the current transformer is one kind in straight-through current transformer or open type current transformer.
On the basis of traditional on-load switch fuse combined electric apparatus, increase by four straight-through current transformers or open type Current Mutual Inductance
Device, cost of investment are small.
Present invention also offers a kind of double protection on-load switch fuse combinational circuits, including the energy storage for circuit energy storage
Branch road, combined floodgate branch road, the separating brake branch road for controlling outgoing line cabinet separating brake and for outgoing line cabinet for controlling outgoing line cabinet to close a floodgate
The tripping operation branch road of traffic overload protection, the energy storage branch road, combined floodgate branch road, separating brake branch road, tripping operation branch circuit parallel connection electrical connection.
Preferably, the tank circuit of the energy storage branch route electrical connection in parallel and energy storage instruction loop composition；The energy storage
Loop includes the normally-closed contact CK1-1 for control switch ZK, energy storage motor D and the travel switch CK being connected in series, the energy storage
Indicate that loop includes the normally opened contact CK1-2 for the energy storage indicator lamp BD and travel switch CK being connected in series.Main order is closed manually to open
ZK is closed, tank circuit is connected, and energy storage motor D starts energy storage；When energy storage finishes, energy storage motor D travel switch CK normally-closed contacts
CK1-1 disconnects, and motor stops energy storage；Meanwhile energy storage motor D travel switch CK normally opened contacts CK1-2 closes, energy storage instruction is connected
Loop, energy storage indicator lamp BD are bright.
Preferably, the closing circuit of the combined floodgate branch route electrical connection in parallel and the instruction loop composition that closes a floodgate；The combined floodgate
Loop includes combined floodgate indicator lamp HD and born including the controlling switch KK being connected in series and closing coil HQ, the instruction loop of closing a floodgate
Lotus switchs FK normally opened contact FK1-1.Controlling switch KK is rotated manually, connects closing circuit, and closing coil HQ is powered, and triggering is closed
Brake mechanism acts, and closes a tie lines on-load switch FK；Meanwhile on-load switch normally opened contact FK1-1 closes, instruction of closing a floodgate is connected
Loop, combined floodgate indicator lamp HD are bright.
Preferably, the sub-gate circuit of the separating brake branch route electrical connection in parallel and separating brake instruction loop composition；The separating brake
Loop includes the controlling switch KK being connected in series and switching winding TQ, and the separating brake instruction loop includes separating brake indicator lamp LD and born
Lotus switchs FK normally-closed contact FK1-2.Controlling switch KK is rotated manually, connects sub-gate circuit, and switching winding TQ is powered, triggering point
Brake mechanism acts, and separates a tie lines on-load switch FK；Meanwhile on-load switch normally-closed contact FK1-2 closes, separating brake instruction is connected
Loop, separating brake indicator lamp LD are bright.
Preferably, the tripping operation branch road includes the first comprehensive relay protection device FA1, the second comprehensive relay protection device
FA2 and connection sheet 1LP；The first comprehensive relay protection device FA1 and connection sheet 1LP is parallel to control after being connected in series
Switch KK the 7th contact KK1-7, the 8th contact KK1-8 both ends, the second comprehensive relay protection device FA2 and separating brake branch
Road is connected in parallel；The first comprehensive relay protection device FA1 includes specified time overcurrent protective device FA1-1.Work as traffic overload
Operation, when circuital current reaches specified time overcurrent value, triggering specified time overcurrent protective device FA1-1 specified time overcurrent protection is moved
Make, make on-load switch FK separating brakes.
Compared with prior art, the beneficial effects of the invention are as follows：
（1）Cut off the quick action of failure：When fault current exceedes transfer current or take-over current, fuse is at first
Half-wave is to be acted in 10 ms, and fuse blows cut off short trouble, and responsiveness is faster than the ms of actuation time 60 of breaker.
（2）The duplicate protection to outgoing line cabinet can be realized：Can precisely it be realized by the setting of comprehensive relay protection device
Overcurrent protection is definited time-lag, on-load switch comprehensive relay protection device when circuital current is more than specified time overcurrent value acts；Pass through
The setting of fuse fuse blows, dual guarantor is realized to outgoing line cabinet when fault current exceedes transfer current or take-over current
Shield.
（3）Cost of investment is small, and operating cost is low：On the basis of traditional on-load switch fuse combined electric apparatus, increase
Comprehensive relay protection device summation current transformer, cost of investment are small；When circuital current is more than specified time overcurrent value, comprehensive relay
Protection device specified time overcurrent protection action, makes on-load switch separating brake, and fuse is without damage, greatly reduce operation into
This.
Brief description of the drawings
Fig. 1 is the structural representation of double protection on-load switch fuse combined electric apparatus of the present invention.
Fig. 2 is the secondary tie lines schematic diagram of double protection on-load switch fuse combinational circuits.
Embodiment
With reference to embodiment, the present invention is further illustrated.Wherein, being given for example only property of accompanying drawing illustrates,
What is represented is only schematic diagram, rather than pictorial diagram, it is impossible to is interpreted as the limitation to this patent；In order to which the reality of the present invention is better described
Example is applied, some parts of accompanying drawing have omission, zoomed in or out, and do not represent the size of actual product；To those skilled in the art
For, some known features and its explanation may be omitted and will be understood by accompanying drawing.
Same or analogous label corresponds to same or analogous part in the accompanying drawing of the embodiment of the present invention；In retouching for the present invention
In stating, it is to be understood that if it is based on accompanying drawing to have the orientation of the instructions such as term " on ", " under ", "left", "right" or position relationship
Shown orientation or position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply meaning
Device or element must have specific orientation, with specific azimuth configuration and operation, therefore position relationship described in accompanying drawing
Term being given for example only property explanation, it is impossible to the limitation to this patent is interpreted as, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment one
It is as shown in Figure 1 the embodiment of double protection on-load switch fuse combined electric apparatus of the invention, was definited time-lag for realizing
Comprehensive relay protection device 1, on-load switch 2, fuse 3 and the current transformer 4 for observation circuit electric current of protection are flowed,
The comprehensive relay protection device 1, on-load switch 2, fuse 3, current transformer 4 sequentially electrically connect；On the on-load switch 2
Electric operating system 5 is connected with, the comprehensive relay protection device 1 includes specified time overcurrent protective device；Pass through Current Mutual Inductance
The setting observation circuit electric current of device 4, when circuital current reaches specified time overcurrent value, triggering comprehensive relay protection device 1 acts,
Tripping on-load switch；When fault current exceedes transfer current or take-over current, fuse is to be moved in 10 ms in first half-wave
Make, fuse 3 fuses, and cuts off short trouble, realizes specified time excessively stream, quick-break two class protection.
Wherein, comprehensive relay protection device 1 includes the first comprehensive relay protection device FA1 and second of electrical connection in parallel
Comprehensive relay protection device FA2, specified time overcurrent protection can be realized to outgoing line cabinet, current transformer 4 is centre path current mutual inductance
Device；On the basis of traditional on-load switch fuse combined electric apparatus, increase by 1, four punching electricity of comprehensive relay protection device
Current transformer 4, cost of investment is small, and reaches duplicate protection.
Embodiment two
The embodiment of double protection on-load switch fuse combinational circuits of the present invention is illustrated in figure 2, including for circuit energy storage
Energy storage branch road, for controlling combined floodgate branch road that outgoing line cabinet closes a floodgate, the separating brake branch road for controlling outgoing line cabinet separating brake and being used for
The tripping operation branch road of outgoing line cabinet traffic overload protection, energy storage branch road, combined floodgate branch road, separating brake branch road, tripping operation branch circuit parallel connection electrical connection.
Specifically, the tank circuit of energy storage branch route electrical connection in parallel and energy storage instruction loop composition；Tank circuit includes
The control switch ZK, energy storage motor D and the travel switch CK that are connected in series normally-closed contact CK1-1, energy storage instruction loop include
The energy storage indicator lamp BD being connected in series and travel switch CK normally opened contact CK1-2.
The closing circuit of combined floodgate branch route electrical connection in parallel and the instruction loop composition that closes a floodgate；Closing circuit includes being connected in series
Controlling switch KK the 5th contact KK1-5, the 6th contact KK1-6 and closing coil HQ, close a floodgate instruction loop refer to including combined floodgate
Show lamp HD and on-load switch FK normally opened contact FK1-1.
The sub-gate circuit of separating brake branch route electrical connection in parallel and separating brake instruction loop composition；Sub-gate circuit includes being connected in series
Controlling switch KK the 7th contact KK1-7, the 8th contact KK1-8 and switching winding TQ, separating brake instruction loop refer to including separating brake
Show lamp LD and on-load switch FK normally-closed contact FK1-2.
Tripping operation branch road includes the first comprehensive relay protection device FA1, the second comprehensive relay protection device FA2 and connection sheet
1LP；First comprehensive relay protection device FA1 and connection sheet 1LP is parallel to controlling switch KK the 7th contact after being connected in series
KK1-7, the 8th contact KK1-8 both ends, the second comprehensive relay protection device FA2 are connected with separating brake branch circuit parallel connection；First synthesis
Protective relaying device FA1 is specified time overcurrent protective device FA1-1.
The operation principle of the present embodiment is as follows：
Control switch ZK is closed manually, and tank circuit is connected, and energy storage motor D starts energy storage；When energy storage finishes, energy storage motor D rows
Cheng Kaiguan CK normally-closed contacts CK1-1 disconnects, and motor stops energy storage；Meanwhile energy storage motor D travel switch CK normally opened contacts CK1-2
Close, connect energy storage instruction loop, energy storage indicator lamp BD is bright.Controlling switch KK, the 5th contact KK1-5 of connection, the are rotated manually
Six contact KK1-6, closing circuit is connected, closing coil HQ is powered, triggering switching-on mechanism action, closes a tie lines on-load switch
FK；Meanwhile on-load switch normally opened contact FK1-1 closes, instruction loop of closing a floodgate is connected, combined floodgate indicator lamp HD is bright.Control is rotated manually
System switch KK, the 7th contact KK1-7 of connection, the 8th contact KK1-8 connect sub-gate circuit, and switching winding TQ is powered, triggers separating brake
Mechanism action, separate a tie lines on-load switch FK；Meanwhile on-load switch normally-closed contact FK1-2 closes, connect separating brake and indicate back
Road, separating brake indicator lamp LD are bright.When load normal operation, when circuital current is less than rated current, comprehensive relay protection device is not
Action；When traffic overload is run, and circuital current reaches specified time overcurrent value, triggering specified time overcurrent protective device FA1-1's
Overcurrent protection action is definited time-lag, makes on-load switch FK separating brakes；When short trouble occurs, circuital current increases several times suddenly, melts
Disconnected device is to be acted in 10ms in first half-wave, quick fuse, cuts off short trouble, reaches quick-break effect.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (9)
1. a kind of double protection on-load switch fuse combined electric apparatus, it is characterised in that including definiting time-lag overcurrent protection for realizing
Comprehensive relay protection device（1）, on-load switch（2）, fuse（3）And the current transformer for observation circuit electric current
（3）, the comprehensive relay protection device（1）, on-load switch（2）, fuse（3）, current transformer（4）Order electrically connects；Institute
State on-load switch（2）On be connected with electric operating system（5）, the comprehensive relay protection device（1）Protected including specified time excessively stream
Protection unit.
2. double protection on-load switch fuse combined electric apparatus according to claim 1, it is characterised in that the comprehensive relay
Protection device（1）Include the first comprehensive relay protection device FA1 and the second comprehensive relay protection device of parallel connection electrical connection
FA2。
3. double protection on-load switch fuse combined electric apparatus according to claim 1 or 2, it is characterised in that the electric current
Transformer（3）For one kind in straight-through current transformer or open type current transformer.
A kind of 4. double protection on-load switch fuse combinational circuits, it is characterised in that including the energy storage branch road for circuit energy storage,
For combined floodgate branch road, the separating brake branch road for controlling outgoing line cabinet separating brake and for outgoing line cabinet load mistake for controlling outgoing line cabinet to close a floodgate
Carry the tripping operation branch road of protection, the energy storage branch road, combined floodgate branch road, separating brake branch road, tripping operation branch circuit parallel connection electrical connection.
5. double protection on-load switch fuse combinational circuits according to claim 4, it is characterised in that the energy storage branch road
It is made up of the tank circuit and energy storage instruction loop of parallel connection electrical connection；The tank circuit includes the control switch being connected in series
ZK, energy storage motor D and travel switch CK normally-closed contact CK1-1, the energy storage instruction loop includes the energy storage being connected in series
Indicator lamp BD and travel switch CK normally opened contact CK1-2.
6. double protection on-load switch fuse combinational circuits according to claim 4, it is characterised in that the combined floodgate branch road
It is made up of the closing circuit and instruction loop of closing a floodgate of parallel connection electrical connection；The closing circuit includes the controlling switch KK being connected in series
With closing coil HQ, the instruction loop of closing a floodgate includes combined floodgate indicator lamp HD and on-load switch FK normally opened contact FK1-1.
7. double protection on-load switch fuse combinational circuits according to claim 4, it is characterised in that the separating brake branch road
It is made up of the sub-gate circuit and separating brake instruction loop of parallel connection electrical connection；The sub-gate circuit includes the controlling switch KK being connected in series
With switching winding TQ, the separating brake instruction loop includes separating brake indicator lamp LD and on-load switch FK normally-closed contact FK1-2.
8. double protection on-load switch fuse combinational circuits according to claim 6 or 7, it is characterised in that the control
Switch KK includes the 5th contact KK1-5, the 6th contact KK1-6, the 7th contact KK1-7 and the 8th contact KK1-8, and the described 5th
Contact KK1-5 and the 6th contact KK1-6 are connected in the closing circuit, the 7th contact KK1-7 and the 8th contact KK1-8
It is connected in the sub-gate circuit.
9. double protection on-load switch fuse combinational circuits according to claim 4, it is characterised in that the tripping operation branch road
Including the first comprehensive relay protection device FA1, the second comprehensive relay protection device FA2 and connection sheet 1LP；It is described first synthesis after
Electrical protective device FA1 and the connection sheet 1LP are parallel to controlling switch KK the 7th contact KK1-7, the 8th touched after being connected in series
Point KK1-8 both ends, the second comprehensive relay protection device FA2 are connected with separating brake branch circuit parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710901206.5A CN107634499A (en) | 2017-09-28 | 2017-09-28 | Double-protection load switch fuse combined electrical apparatus and circuit structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710901206.5A CN107634499A (en) | 2017-09-28 | 2017-09-28 | Double-protection load switch fuse combined electrical apparatus and circuit structure |
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| Publication Number | Publication Date |
|---|---|
| CN107634499A true CN107634499A (en) | 2018-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710901206.5A Pending CN107634499A (en) | 2017-09-28 | 2017-09-28 | Double-protection load switch fuse combined electrical apparatus and circuit structure |
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| Country | Link |
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| CN (1) | CN107634499A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113065755A (en) * | 2021-03-25 | 2021-07-02 | 广东电网有限责任公司广州供电局 | Medium-low voltage fuse model selection method, device, equipment and medium |
| CN117375208A (en) * | 2023-11-01 | 2024-01-09 | 希格玛电气(珠海)有限公司 | Novel control system of automatic switching equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201450257U (en) * | 2009-06-15 | 2010-05-05 | 江苏省电力公司泰州供电公司 | Box-type interconnection transformer substation for reducing 20kV/10kV to 0.4kV |
| CN201845666U (en) * | 2010-11-10 | 2011-05-25 | 新密市供电公司 | Anti-burnt automatic protecting device of closing coil of breaker spring operation mechanism |
| CN201909821U (en) * | 2010-12-07 | 2011-07-27 | 大庆石油管理局 | Spare power automatic switching device tester |
| CN104485645A (en) * | 2014-12-31 | 2015-04-01 | 南宏电力科技有限公司 | Microcomputer relay protection method and device adopted on switch cabinet with load switch |
| CN207283144U (en) * | 2017-09-28 | 2018-04-27 | 广东电网有限责任公司东莞供电局 | Double-protection load switch fuse combined electrical apparatus and circuit structure |
-
2017
- 2017-09-28 CN CN201710901206.5A patent/CN107634499A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201450257U (en) * | 2009-06-15 | 2010-05-05 | 江苏省电力公司泰州供电公司 | Box-type interconnection transformer substation for reducing 20kV/10kV to 0.4kV |
| CN201845666U (en) * | 2010-11-10 | 2011-05-25 | 新密市供电公司 | Anti-burnt automatic protecting device of closing coil of breaker spring operation mechanism |
| CN201909821U (en) * | 2010-12-07 | 2011-07-27 | 大庆石油管理局 | Spare power automatic switching device tester |
| CN104485645A (en) * | 2014-12-31 | 2015-04-01 | 南宏电力科技有限公司 | Microcomputer relay protection method and device adopted on switch cabinet with load switch |
| CN207283144U (en) * | 2017-09-28 | 2018-04-27 | 广东电网有限责任公司东莞供电局 | Double-protection load switch fuse combined electrical apparatus and circuit structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113065755A (en) * | 2021-03-25 | 2021-07-02 | 广东电网有限责任公司广州供电局 | Medium-low voltage fuse model selection method, device, equipment and medium |
| CN113065755B (en) * | 2021-03-25 | 2023-01-20 | 广东电网有限责任公司广州供电局 | Medium-low voltage fuse model selection method, device, equipment and medium |
| CN117375208A (en) * | 2023-11-01 | 2024-01-09 | 希格玛电气(珠海)有限公司 | Novel control system of automatic switching equipment |
| CN117375208B (en) * | 2023-11-01 | 2024-05-24 | 希格玛电气(珠海)有限公司 | Novel control system of automatic switching equipment |
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Application publication date: 20180126 |
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