CN105244843A - Protection circuit for electric heating furnace - Google Patents
Protection circuit for electric heating furnace Download PDFInfo
- Publication number
- CN105244843A CN105244843A CN201510627426.4A CN201510627426A CN105244843A CN 105244843 A CN105244843 A CN 105244843A CN 201510627426 A CN201510627426 A CN 201510627426A CN 105244843 A CN105244843 A CN 105244843A
- Authority
- CN
- China
- Prior art keywords
- electric furnace
- power supply
- electric heating
- heating furnace
- supply phase
- 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.)
- Pending
Links
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a protection circuit for an electric heating furnace. The protection circuit comprises three voltage detection relays, wherein one ends of coils of the three voltage detection relays are correspondingly connected with three power supply phase lines; the other ends of the coils are connected with a null line, and used for detecting whether a voltage is output or not in any power supply phase line; contacts of the three voltage detection relays are arranged in parallel respectively; and when the coil of any voltage detection relay detects a voltage output in a corresponding power supply phase line, a corresponding contact acts in order to control the electric heating furnace to be powered off. Through the three voltage detection relays, breakdown of silicon controlled rectifiers is detected, and the electric heating furnace can be powered off, thereby fulfilling the aim of protecting the electric heating furnace.
Description
Technical field
The present invention relates to air separation field, refer in particular to a kind of protective circuit of electric furnace.
Background technology
The purifier of air separation equipment needs supporting electric furnace; in order to reach energy-conservation order ground; usual employing controllable silicon regulable control; but in practical operation; easily short circuit is caused afterwards because controllable silicon punctures; heating furnace dry combustion method or cable is caused to burn; produce to air separation and impact; even threaten personal safety; for this reason, we have developed a kind of protective circuit of electric furnace, detect controllable silicon by breakdown by three voltage detecting relays; and electric furnace power-off can be made, reach the object of protection electric furnace.
Summary of the invention
The present invention seeks to the protective circuit that a kind of electric furnace is provided to overcome the deficiencies in the prior art, detecting controllable silicon by breakdown by three voltage detecting relays, and electric furnace power-off can be made, reaching the object of protection electric furnace.
For achieving the above object, the technical solution used in the present invention is: a kind of protective circuit of electric furnace, comprises three voltage detecting relays; Coil one end of three described voltage detecting relays is corresponding with three power supply phase lines respectively to be connected, and whether the other end is connected with zero line, have voltage to export for detecting in any power supply phase line; The contact of three described voltage detecting relays is arranged in parallel respectively, when the Coil Detector of any one voltage detecting relay has voltage to export in corresponding power supply phase line, then makes the action control electric furnace power-off of corresponding contact.
Preferably, the collateral contact of three described voltage detecting relays is also arranged in series with enabling signal.
Due to the utilization of technique scheme, the present invention compared with prior art has following advantages:
The protective circuit of electric furnace of the present invention detects controllable silicon by breakdown by three voltage detecting relays, and can make electric furnace power-off, reach the object of protection electric furnace, and circuit is simple, uses more reliable and secure.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Accompanying drawing 1 is the circuit diagram of the protective circuit of electric furnace of the present invention;
Accompanying drawing 2 is the control chart of the protective circuit of electric furnace of the present invention;
Wherein: 1KA, 2KA, 3KA are voltage detecting relay; 4KA is enabling signal; F is the switch coil of electric furnace.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Accompanying drawing 1-2 is the protective circuit of electric furnace of the present invention, comprises three voltage detecting relays; Coil one end of three described voltage detecting relays is corresponding with three power supply phase lines respectively to be connected, and whether the other end is connected with zero line, have voltage to export for detecting in any power supply phase line; The normally opened contact of three described voltage detecting relays is arranged in parallel respectively and is arranged in series with enabling signal, after enabling signal starts, when the Coil Detector of any one voltage detecting relay has voltage to export in corresponding power supply phase line, then make the action control electric furnace power-off of corresponding contact.
During use: every road power supply phase line is all connected with a controllable silicon; as long as when three voltage detecting relays have one to detect that voltage exports; then have at least the controllable silicon in a road power supply phase line breakdown; now the normally opened contact of three voltage detecting relays at least have one close; control the coil blackout of electric furnace switch; thus make electric furnace power-off, reach the object of protection electric furnace.
Due to the utilization of technique scheme, the present invention compared with prior art has following advantages:
The protective circuit of electric furnace of the present invention detects controllable silicon by breakdown by three voltage detecting relays, and can make electric furnace power-off, reach the object of protection electric furnace, and circuit is simple, uses more reliable and secure.
Below be only embody rule example of the present invention, protection scope of the present invention is not constituted any limitation.The technical scheme that all employing equivalents or equivalence are replaced and formed, all drops within rights protection scope of the present invention.
Claims (2)
1. a protective circuit for electric furnace, is characterized in that: comprise three voltage detecting relays; Coil one end of three described voltage detecting relays is corresponding with three power supply phase lines respectively to be connected, and whether the other end is connected with zero line, have voltage to export for detecting in any power supply phase line; The contact of three described voltage detecting relays is arranged in parallel respectively, when the Coil Detector of any one voltage detecting relay has voltage to export in corresponding power supply phase line, then makes the action control electric furnace power-off of corresponding contact.
2. the protective circuit of electric furnace according to claim 1, is characterized in that: the collateral contact of three described voltage detecting relays is also arranged in series with enabling signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510627426.4A CN105244843A (en) | 2015-09-28 | 2015-09-28 | Protection circuit for electric heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510627426.4A CN105244843A (en) | 2015-09-28 | 2015-09-28 | Protection circuit for electric heating furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105244843A true CN105244843A (en) | 2016-01-13 |
Family
ID=55042378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510627426.4A Pending CN105244843A (en) | 2015-09-28 | 2015-09-28 | Protection circuit for electric heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105244843A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145683A (en) * | 2007-10-31 | 2008-03-19 | 李志学 | Control device for residual current of low-voltage power grid |
| CN202384755U (en) * | 2011-12-08 | 2012-08-15 | 华晶精密制造有限公司 | Three-phase solid-state relay protector |
| CN103607801A (en) * | 2013-07-21 | 2014-02-26 | 高宇斌 | Lighting energy-saving automatic control device |
| CN205070398U (en) * | 2015-09-28 | 2016-03-02 | 苏州制氧机股份有限公司 | Electric heating furnace's protection circuit |
-
2015
- 2015-09-28 CN CN201510627426.4A patent/CN105244843A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145683A (en) * | 2007-10-31 | 2008-03-19 | 李志学 | Control device for residual current of low-voltage power grid |
| CN202384755U (en) * | 2011-12-08 | 2012-08-15 | 华晶精密制造有限公司 | Three-phase solid-state relay protector |
| CN103607801A (en) * | 2013-07-21 | 2014-02-26 | 高宇斌 | Lighting energy-saving automatic control device |
| CN205070398U (en) * | 2015-09-28 | 2016-03-02 | 苏州制氧机股份有限公司 | Electric heating furnace's protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2015028222A3 (en) | Surge protection for active rectifiers in the event of load shedding | |
| CN104283263A (en) | Direct-current charging pile main circuit double-control power supply system and control method thereof | |
| CN203278215U (en) | Secondary overvoltage protector for current transformer | |
| CN204481514U (en) | Control box on novel electric vehicle cable | |
| CN205070398U (en) | Electric heating furnace's protection circuit | |
| CN105244843A (en) | Protection circuit for electric heating furnace | |
| CN203942269U (en) | A kind of New Arc failure to trip device | |
| CN103618295A (en) | Photoelectric type arc light protecting system | |
| CN204835513U (en) | Voltage type arc light protection device | |
| CN104319810A (en) | Input safety protection circuit of photovoltaic inverter and photovoltaic inverter having safety protection function | |
| CN204789786U (en) | Three -phase overvoltage protection device's automatic testing arrangement | |
| CN104600684B (en) | A kind of three dropout surge protectors of active arc extinguishing | |
| CN202548180U (en) | Electrolysis unit electrostatic detection device | |
| CN203445064U (en) | Closing phase control system of AC contactor | |
| CN102707206A (en) | Reclosure device for insulation detection | |
| CN104378091A (en) | Solid-state relay monitoring circuit | |
| CN204407853U (en) | Laboratory power supply protective device | |
| CN204349430U (en) | The current protection system of direct current machine | |
| CN104319559A (en) | Leakage protection plug with ground wire live-line indication | |
| CN204231313U (en) | A kind of solid-state relay observation circuit | |
| CN103779832A (en) | Electricity-stealing prevention method for low-voltage line | |
| CN204205200U (en) | There is the leakage protecting plug of ground wire electrification instruction | |
| CN104037740A (en) | Arc fault disconnecting device | |
| CN202917951U (en) | Alternating current (AC) servo driver | |
| CN204030297U (en) | A kind of power distribution cabinet with ageing of insulation status monitoring function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160113 |
|
| RJ01 | Rejection of invention patent application after publication |