CN208257394U - A kind of Electric Circuit for Protecting Three-phrase Alternatiy - Google Patents
A kind of Electric Circuit for Protecting Three-phrase Alternatiy Download PDFInfo
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- CN208257394U CN208257394U CN201820738930.0U CN201820738930U CN208257394U CN 208257394 U CN208257394 U CN 208257394U CN 201820738930 U CN201820738930 U CN 201820738930U CN 208257394 U CN208257394 U CN 208257394U
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- phase alternating
- current
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- contactor
- current supply
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Abstract
A kind of Electric Circuit for Protecting Three-phrase Alternatiy belongs to three-phase alternating current source protection field of circuit technology, it is intended to which solving the problem of that existing three-phase alternating current source protection circuit structure design is unreasonable leads to motor burnout failure.The three-phase alternating-current supply inlet wire series connection automatic air circuit breaker that it is used, three power supply output lines difference master control A.C. contactor in parallel and current-limiting resistance, current-limiting resistance distinguishes series electrical signal lamp again, the three-phase alternating-current supply output line of master control A.C. contactor is connected respectively connects three-phase alternating-current supply outlet terminal after thermal relay normally closed contact, three power supply output lines of automatic air circuit breaker are separately connected 2 relays and emergency light, thermal relay normally closed contact, control the return line and electric signal indicator light of A.C. contactor, emergency light, the return line of relay coil connects the N line of three-phase alternating-current supply output line together.Its is simple and practical in structure, the open-phase protection suitable for three-phase alternating-current supply used in three-phase alternating-current motor and electrical equipment etc..
Description
Technical field
The utility model belongs to a kind of phase shortage guarantor of three-phase alternating-current supply in three-phase alternating current source protection field of circuit technology
Protection circuit.
Background technique
With the increasingly developed and technological progress of metal casting industry, to including gold in three-phase alternating-current motor and electrical equipment
The technical requirements for belonging to three-phase alternating current source protection circuit used in casting smelting furnace are also higher and higher.It is existing in well-known technique
The open-phase protection circuit of three-phase alternating-current supply used in three-phase alternating-current motor and electrical equipment mainly by three-phase alternating-current supply into
Load by photoelectrical coupler, capacitor, letter between line terminals L1, L2, L3, N and three-phase alternating-current supply outlet terminal U, V, W, N
Number amplifier lamp group at open-phase protection circuit or use 400V tri- of disconnecting switch, automatic switch and current supply circuit exchange
The open-phase protection circuit of the compositions such as the low voltage distribution circuit of power supply.But it is limited by its circuit structure, unreasonable structural design, especially
Its metal casting electric melting furnace for being high-power three-phase alternating-current power supply and electrical equipment are three-phase alternating-current motor, in weight
Under load, invariable power starting and operation conditions, once three-phase alternating-current supply phase shortage will make the electromagnetic torque of three phase alternating current motor
Missing, under same load, remaining biphase current increases, and leads to motor burnout failure, influences normally to produce, and because repairing thing
Therefore equipment causes the waste of human and material resources again, actual use is restricted, and also brings inconvenience to practical application.With gold
The continuous development of category foundry industry and 250KW and the above high-power three-phase alternating-current motor are widely applied, it is also very desirable to be further improved
The Electric Circuit for Protecting Three-phrase Alternatiy instrument and equipment novel with one kind is researched and developed.
Utility model content
For overcome the deficiencies in the prior art, it is unreasonable to solve existing three-phase alternating current source protection circuit structure design,
The problem of leading to motor burnout failure.The purpose of the utility model be to provide it is a kind of simple and practical in structure, once three-phase alternating current
Source phase shortage etc., energy automatic protection, applied widely, new-type Electric Circuit for Protecting Three-phrase Alternatiy easy to use.
The technical scheme in the invention for solving the above technical problem:
A kind of Electric Circuit for Protecting Three-phrase Alternatiy, it includes: three-phase alternating-current supply input terminal L1, L2, L3, N, and three
Phase AC power source outlet terminal U, V, W, N, automatic air circuit breaker F1, master control A.C. contactor KM1, current-limiting resistance R1-R3, electricity
Signal lamp T1-T3, emergency light T4,2 relay K1-K2, electrothermal relay FR1, three-phase alternating-current supply input terminal L1,
Three power supply lines 1,3,5 of L2, L3 connect connect after automatic air circuit breaker F1 master control A.C. contactor KM1 parallel with one another and
Series electrical signal lamp T1-T3, master control A.C. contactor KM1 connect respectively again by current-limiting resistance R1-R3, current-limiting resistance R1-R3
Three-phase alternating-current supply output line 2,4,6 is separately connected three-phase alternating-current supply outlet terminal U, V, W after major loop electrothermal relay FR1,
The current-limiting resistance R1-R2 difference that No. 100 lines, No. 200 lines in three power supply output lines of automatic air circuit breaker F1 connect is simultaneously
It is associated with relay K1-K2, No. 300 lines of power supply output line in tri- power supply output lines of automatic air circuit breaker F1 are connected with successively
Concatenated relay K1 normally opened contact K1-1 and relay K2 normally opened contact K2-1, relay K2 normally opened contact K2-1 connect phase again
The mutually normally-closed contact FR1-1 of emergency light T4 in parallel and electrothermal relay FR1, the normally-closed contact FR1-1 of electrothermal relay FR1 is successively
The coil of master control A.C. contactor KM1, the return line and electric signal indicator light T1-T3 of master control A.C. contactor KM1 coil, emergency
Lamp T4, relay K1-K2 coil return line connect three-phase alternating-current supply output line N together.
A kind of above-mentioned Electric Circuit for Protecting Three-phrase Alternatiy, the automatic air circuit breaker F1 are connected with master manually and open
It closes.
A kind of above-mentioned Electric Circuit for Protecting Three-phrase Alternatiy, the electric signal indicator light T1-T3 are LED light-emitting diodes
Any electric signal indicator light of pipe, LED light；And the electric signal indicator light of other adaptive types.
When the utility model is used, according to design requirement and actual needs, the three-phase alternating-current supply phase shortage of the utility model is protected
Three-phase alternating-current supply input terminal L1, L2, L3, the N on protection circuit top are connected in switchgear low-voltage busbar；Three intersections of lower part
Galvanic electricity source outlet terminal U, V, W, N connect downstream electrical equipment bus.When actual motion, automatic air circuit breaker F1 and hand
Dynamic main switch has compound tripping defencive function, and when short circuit or heavy overload electric current occur for route, short circuit current is more than instantaneous
Tripping setting current value, magnetictrip generate sufficiently large suction, armature are attracted to and are hit lever, make to have contact with the axle bed that rotates
It is rotated up and is disengaged with lock, latch in three secondary main contact disjunctions under the action of reaction spring, cut off the power；When route occurs
When generality overload, though overload current cannot be such that magnetictrip acts, thermal element can be made to generate certain heat, promote double gold
Category piece is heated to be bent upwards, and is pushed lever to make to have contact with and is latched disengagement, main contact disjunction is cut off the power；Master control ac contactor
Device KM1, when three-phase alternating-current supply is normal, main contacts is closed downstream electrical equipment normal power supply, when three-phase alternating-current supply phase shortage
When main contacts disconnect and stopping to power supply for electrical equipment；Major loop electrothermal relay FR1 has overcurrent protection function；Current-limiting resistance R1 and
Electric signal indicator light T1 is aobvious by No. 100 line connection composition three-phase alternating-current supply inlet wire L1 phase normal power supply electric signal indicator lights
Show；Current-limiting resistance R2 connects composition three-phase alternating-current supply inlet wire L2 phase normal power supply by No. 200 lines with electric signal indicator light T2
Electric signal indicator light is shown；Current-limiting resistance R3 and electric signal indicator light T3 by No. 300 lines connect composition three-phase alternating-current supply into
Line L3 phase normal power supply electric signal indicator light is shown；Emergency light T4 passes through No. 300 lines, normally opened contact K1-1, normally opened contact K2-1
Three-phase alternating-current supply inlet wire L3 phase is connected, normal power supply is in charged state electric signal indicator light and does not shine, and works as three-phase alternating current
Emergency light T4 loses mains electricity signal indicator light and shines when the phase shortage of source, as field maintenance temporary lighting；Relay K1 coil electricity
The three-phase alternating-current supply inlet wire L1 phase that source is taken by No. 100 lines；The three-phase alternating current that relay K2 coil power is taken by No. 200 lines
Electric power incoming line L2 phase；Master control A.C. contactor KM1 coil power passes through No. 300 lines, relay K1 normally opened contact K1-1, relay
The three-phase alternating-current supply inlet wire L3 phase that the normally-closed contact FR1-1 closure connection of K2 normally opened contact K2-1, electrothermal relay FR1 take；From
Dynamic air-break circuit-breaker F1, when three-phase alternating-current supply normal power supply, normal relay K1 normally opened contact K1-1, relay K2 normally opened contact
K2-1 closure and electrothermal relay FR1 normally-closed contact FR1-1 be closed so that master control A.C. contactor KM1 coil switch power its
Three-phase main contacts closure, normally downstream power supply for electrical equipment.
Due to the normally-closed contact of relay K1 normally opened contact K1-1, relay K2 normally opened contact K2-1, electrothermal relay FR1
FR1-1 is serially connected in the control loop of master control A.C. contactor KM1 coil, either three-phase alternating-current supply inlet wire L1 phase shortage (electricity
Signal lamp T1 lamp, which goes out, shows three-phase alternating-current supply inlet wire L1 phase shortage) cause relay K1 coil losing electricity contact to disconnect, it is other
Three-phase alternating-current supply inlet wire L2-L3 phase shortage it is identical as the principle of three-phase alternating-current supply inlet wire L1 phase shortage, but master control exchange connect
Tentaculum KM1 coil equally understands three characteristics of the middle term AC power source inlet wire L3 power loss and acts and immediately freeze under non-full-phase state to electrical equipment
Power supply, to thoroughly avoid the generation under three-phase alternating-current motor heavy duty because burning motor accident caused by phase-deficient operation.When
Electrical equipment load current it is excessive even more than relay K1 setting valve when, relay K1 normally-closed contact K1-1 disconnect so that master control
A.C. contactor KM1 coil losing electricity and cut off downstream electrical equipment power supply, effectively prevent electrical equipment because overcurrent is burnt, keep away
Exempt from accident.
Since the utility model design uses above-mentioned technical proposal, efficiently solves existing three-phase alternating-current supply and protect
Protection circuit unreasonable structural design, the problem of leading to motor burnout failure.Also show it by actual tests result on trial for several times
With simple and practical in structure, once three-phase alternating-current supply phase shortage etc., can automatic protection, it is applied widely, it is safe and reliable to operation, make
The advantages that with facilitating includes that high power three-phase is handed over suitable for three-phase alternating-current supply used in three-phase alternating-current motor and electrical equipment etc.
The open-phase protection in galvanic electricity source.
Detailed description of the invention
The utility model is described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is a kind of basic circuit diagram of the utility model embodiment.
Each label in attached drawing are as follows: L1, L2, L3, N three-phase alternating-current supply input terminal；U, V, W, N three-phase alternating-current supply outlet
Terminal；F1 automatic air circuit breaker；KM1 master control A.C. contactor；R1-R3 current-limiting resistance；T1-T3 electric signal indicator light；T4 is answered
Anxious lamp；K1-K2 relay；K1-1 relay K1 normally opened contact；K2-1 relay K2 normally opened contact；FR1-3 normally-closed contact；FR1
Major loop electrothermal relay；The normally-closed contact of FR1-1 electrothermal relay FR1.
Specific embodiment
Embodiment as shown in Fig. 1, the utility model include: three-phase alternating-current supply input terminal L1, L2, L3, N, three-phase
AC power source outlet terminal U, V, W, N and automatic air circuit breaker F1, master control A.C. contactor KM1, automatic air circuit breaker F1,
Master control A.C. contactor KM1, current-limiting resistance R1-R3, electric signal indicator light T1-T3, emergency light T4,2 relay K1-K2, masters
The series connection automatic air open circuit of three power supply lines 1,3,5 of loop thermal relay FR1, three-phase alternating-current supply input terminal L1, L2, L3
Master control A.C. contactor KM1 and current-limiting resistance R1-R3 parallel with one another are connected after device F1, current-limiting resistance R1-R3 connects respectively again
Electric signal indicator light T1-T3, i.e. current-limiting resistance R1 series electrical signal lamp T1, current-limiting resistance R2 series electrical signal lamp
Three-phase after T2, current-limiting resistance R3 series electrical signal lamp T3, master control A.C. contactor KM1 series connection major loop electrothermal relay FR1
AC power source output line 2,4,6 is separately connected three-phase alternating-current supply outlet terminal U, V, W, three electricity of automatic air circuit breaker F1
The current-limiting resistance R1-R2 of No. 100 lines, No. 200 line connections in the output line of source is parallel with relay K1-K2, i.e. current limliting electricity respectively
R1 is parallel with relay K1, current-limiting resistance R2 is parallel with relay K2 for resistance, in tri- power supply output lines of automatic air circuit breaker F1
No. 300 lines of power supply output line be connected with the relay K1 normally opened contact K1-1 being sequentially connected in series and relay K2 normally opened contact K2-
1, relay K2 normally opened contact K2-1 connect the normally-closed contact FR1-1 of emergency light T4 and electrothermal relay FR1 parallel with one another again, heat
The coil of the normally-closed contact FR1-1 of relay FR1 successively master control A.C. contactor KM1, master control A.C. contactor KM1 coil
Return line and electric signal indicator light T1-T3, emergency light T4, relay K1-K2 coil return line connect three-phase alternating current together
The N line of source output line；The automatic air circuit breaker F1 is connected with manual main switch；The electric signal indicator light T1-T3 is LED
Light emitting diode.
Claims (3)
1. a kind of Electric Circuit for Protecting Three-phrase Alternatiy, it includes three-phase alternating-current supply input terminal (L1, L2, L3, N), three
Phase AC power source outlet terminal (U, V, W, N), which is characterized in that further include automatic air circuit breaker (F1), master control ac contactor
Device (KM1), electric signal indicator light (T1-T3), emergency light (T4), 2 relays (K1-K2), is led back current-limiting resistance (R1-R3)
Road electrothermal relay (FR1), three power supply lines (1,3,5) series connection automatic air of three-phase alternating-current supply input terminal (L1, L2, L3)
Breaker (F1) connects master control A.C. contactor (KM1) and current-limiting resistance (R1-R3) parallel with one another, current-limiting resistance (R1- afterwards
R3) again respectively series electrical signal lamp (T1-T3), after master control A.C. contactor (KM1) series connection major loop electrothermal relay (FR1)
Three-phase alternating-current supply output line (2,4,6) is separately connected three-phase alternating-current supply outlet terminal (U, V, W), automatic air circuit breaker
(F1) current-limiting resistance (R1-R2) of No. 100 lines in three power supply output lines, No. 200 line connections is parallel with relay respectively
(K1-K2), No. 300 lines of power supply output line are connected with relay (K1) normally opened contact (K1-1) and relay (K2) being sequentially connected in series
Normally opened contact (K2-1), relay (K2) normally opened contact (K2-1) connect emergency light parallel with one another (T4) and electrothermal relay again
(FR1) normally-closed contact (FR1-1), the normally-closed contact (FR1-1) of electrothermal relay (FR1) successively master control A.C. contactor
(KM1) coil, the return line and electric signal indicator light (T1-T3) of master control A.C. contactor (KM1) coil, emergency light (T4),
The return line of relay (K1-K2) coil connects three-phase alternating-current supply output line (N) together.
2. a kind of Electric Circuit for Protecting Three-phrase Alternatiy according to claim 1, which is characterized in that the automatic air
Breaker (F1) is connected with manual main switch.
3. a kind of Electric Circuit for Protecting Three-phrase Alternatiy according to claim 1, which is characterized in that the electric signal refers to
Show that lamp (T1-T3) is any electric signal indicator light of LED light emitting diode, LED light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820738930.0U CN208257394U (en) | 2018-05-17 | 2018-05-17 | A kind of Electric Circuit for Protecting Three-phrase Alternatiy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820738930.0U CN208257394U (en) | 2018-05-17 | 2018-05-17 | A kind of Electric Circuit for Protecting Three-phrase Alternatiy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208257394U true CN208257394U (en) | 2018-12-18 |
Family
ID=66481607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820738930.0U Expired - Fee Related CN208257394U (en) | 2018-05-17 | 2018-05-17 | A kind of Electric Circuit for Protecting Three-phrase Alternatiy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208257394U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110022053A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | It is a kind of to inhibit the three phase rectifier of function to protect circuit with inrush current |
-
2018
- 2018-05-17 CN CN201820738930.0U patent/CN208257394U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110022053A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | It is a kind of to inhibit the three phase rectifier of function to protect circuit with inrush current |
| CN110022053B (en) * | 2019-03-29 | 2024-03-29 | 合肥华耀电子工业有限公司 | Three-phase rectification protection circuit with input surge current suppression function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181218 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |