CN1450701A - Phase loss (off) alarm protector for electric heating component of electric boiler - Google Patents
Phase loss (off) alarm protector for electric heating component of electric boiler Download PDFInfo
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- CN1450701A CN1450701A CN 02111317 CN02111317A CN1450701A CN 1450701 A CN1450701 A CN 1450701A CN 02111317 CN02111317 CN 02111317 CN 02111317 A CN02111317 A CN 02111317A CN 1450701 A CN1450701 A CN 1450701A
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Abstract
A lacunary alarming protection device for an electrically heating element of an electricity heating boiler includes electrically heating component DR in the boiler, its neutral point end 0 connects with three-phase AC neutral line N characterizing in designing a lacunary alarming protection device between O and N including: a breaker CB with many synchronously linked contacts, normally closed contact CBI is connected in series between DR neutral point and N the lacunary protection component is composed of stop button TA, start button QA and contactor C connected at CB2 of CB, C1, C2, C3 are connected in series between DR and the three-phase AC circuit, C4 is linked in parallel with QA.
Description
Technical field
The present invention relates to a kind of phase shortage alarm protecting apparatus that is used for electrically heated boilers, relate in particular to a kind of can be at the electric heating component of electric boiler electric heating component of electric boiler that detects, reports to the police, protects in service lack (breaking) phase alarm protecting apparatus.
Background technology
What the electrically heated boilers great majority of producing at present adopted is the electrical heating elements of making heater with resistance wire, and in order to keep grid balance, general all three electrical heating elements being connected into by Y type or Δ type inserted operation of power networks after one group when actual motion.Because every electrical heating elements has certain useful life, nor may be identical, along with the growth of running time, a certain resistance wire in one group of electrical heating elements just can rupture earlier, and scarce (breaking) phase fault has just been taken place this group electrical heating elements.In a single day fault takes place, if can not in time report to the police, and can the very big influence of generation to the operation control of boiler.At first, when requiring needs to drop into the operation of this group according to control its actual put into operation power only for design power 2/3rds (neutral lead connects under the situation that the Y type connects or the Δ type connects of the power supply N utmost point, the Y type is littler when connecting) in the case, if second electrical heating elements on the same group ruptures again, then its actual power that puts into operation reduces once more in proportion, finally when on the same group three electrical heating elements complete ruptures, its actual power that puts into operation is zero.If these faults do not have detection means and protective device timely and effectively, handled and in time detect, the automatic control of electrically heated boilers heating causes and can not normally move also with out of control so.
The situation of above-mentioned phenomenon when only just one group of electrical heating elements breaks down.A common electrically heated boilers can have many groups even tens groups of electrical heating elements according to the difference that its capacity and control require, if break down by root by group and do not have corresponding measure to take, consequence will be very serious.Originally may power can not satisfy demand for control and the frequent group number that puts into operation that switches because drop into, occur then seeing that from superficial phenomenon boiler is in the total power state that puts into operation, and the situation of the actual demand that do not reach of exerting oneself, final even situation that can cause not exerting oneself takes place.Yet at present the lacking of electric heating component of electric boiler (breaking), do not detected mutually, report to the police, protect effective device is set in the prior art electrically heated boilers.
Summary of the invention
What the object of the present invention is to provide a kind of improved electric heating component of electric boiler lacks (break) phase alarm protecting apparatus, and it is in operation to the electric heating assembly in the electrically heated boilers and damages the phase shortage that causes and can in time detect, report to the police, and protect automatically.
The object of the present invention is achieved like this:
A kind of scarce (breaking) phase alarm protecting apparatus of electric heating component of electric boiler, comprise: be located at the electric heating assembly DR that adopts Y-connection to constitute by three electrical heating elements DRA, DRB, DRC in the electrically heated boilers, the neutral point O end of three electrical heating elements DRA, DRB, DRC is connected with the neutral line N of three-phase alternating current; Be characterized in:
Between the neutral line N of the neutral point O end of described three electrical heating elements DRA, DRB, DRC and three-phase alternating current, be provided with the phase shortage alarm protecting apparatus; This phase shortage alarm protecting apparatus comprises:
One circuit breaker CB, this circuit breaker CB is provided with the contact of a plurality of synchronous interactions, and normally-closed contact CB1 is serially connected between the neutral line N of the neutral point of electric heating assembly DR and three-phase alternating current;
One open-phase protection parts, these open-phase protection parts are connected the normally-closed contact CB2 of circuit breaker CB, the open-phase protection parts comprise, an one stop button TA and a start button QA, the contact of stop button TA is connected with circuit breaker CB normally-closed contact CB2, another contact is connected with start button QA one contact, and a contactor C who is serially connected between start button QA and the three-phase alternating current electrical neutral axis N; This contactor C is provided with a plurality of contacts, and contact C1, C2, C3 are serially connected in respectively between electrical heating elements DRA and three-phase alternating current A, electrical heating elements DRB and three-phase alternating current B, electrical heating elements DRC and the three-phase alternating current C; Contact C4 and start button QA also connect.
In lacking in (breaking) phase alarm protecting apparatus of above-mentioned electric heating component of electric boiler, wherein, the contact CB1 of two synchronous interactions of described circuit breaker CB and CB2 action is opposite, and normally-closed contact CB1 is serially connected between the neutral line N of the neutral point of electric heating assembly DR and three-phase alternating current; The end of normally opened contact CB2 is connected with stop button TA one contact of three-phase alternating current A and open-phase protection parts;
Described this phase shortage alarm protecting apparatus also comprises: a phase shortage warning piece; one end of this phase shortage warning piece is connected the other end of described circuit breaker CB normally opened contact CB2; the phase shortage warning piece is made up of a signal lamp XD who is connected in parallel to each other and a buzzer DL, and the other end of phase shortage warning piece is connected with three-phase alternating current electrical neutral axis N.
In lacking in (breaking) phase alarm protecting apparatus of above-mentioned electric heating component of electric boiler, wherein, described circuit breaker CB is provided with a plurality of contact CB1, CB2, CB3, and normally-closed contact CB1 is serially connected between the neutral line N of the neutral point of electric heating assembly DR and three-phase alternating current; Normally-closed contact CB2 be serially connected in three-phase electricity A and the open-phase protection parts formed by a stop button TA, a start button QA and a contactor C between; Normally opened contact CB3 be serially connected in three-phase alternating current A and the phase shortage warning piece formed by signal lamp XD and buzzer DL between.
In lacking in (breaking) phase alarm protecting apparatus of above-mentioned electric heating component of electric boiler, wherein, the relevant contacts of described circuit breaker CB is connected with the signal input part of industrial control computer by cable.
In lacking in (breaking) phase alarm protecting apparatus of above-mentioned electric heating component of electric boiler, wherein, in described electrically heated boilers, be provided with supporting many groups phase shortage alarm protecting apparatus with many group electric heating assembly DR.
Scarce (breaking) phase alarm protecting apparatus of electric heating component of electric boiler of the present invention makes it compared with prior art owing to adopted above-mentioned technical scheme, has following advantage and good effect:
1. the present invention owing to be provided with in protective device has the circuit breaker CB of a plurality of normally closed or normally opened contacts, therefore, when electrical heating elements DR is in operation when phase shortage taking place damaging, timely detection failure, and can in time take measures to control the work of its control loop, and connect the indication loop of reporting to the police;
2. the present invention is owing to be provided with contactor C in protective device, damage when phase shortage takes place electrical heating elements DR, the outage of circuit breaker CB control contactor, all contacts of contactor are disconnected, electrical heating elements and being connected also of three-phase alternating current are disconnected, thereby make electrical heating elements withdraw from the state of putting into operation, therefore, greatly improve the safety in utilization of electrically heated boiler, avoided accident to take place, played the open-phase protection effect effectively;
3. protective device of the present invention is easy for installation, and it can be directly be clamped on the matrix guide rail in the equipment with other controlling parts; And debugging is convenient, and the arbitrary contact that artificially disconnects electrical heating elements can be debugged out it and whether play the alarm and protection effect.
Description of drawings
By the description of the following some embodiment that lack (breaking) phase alarm protecting apparatus to electric heating component of electric boiler of the present invention, can further understand purpose of the present invention, specific structural features and advantage in conjunction with its accompanying drawing.Wherein, accompanying drawing is:
Fig. 1 is the theoretical electrical schematic diagram of the phase-lacking protective device of electric heating component of electric boiler;
Fig. 2 is the phase vectors figure of electrical heating elements Y-connection on three phase mains among Fig. 1;
Fig. 3 is the electrical schematic diagram of non-full-phase state in the phase-lacking protective device of electric heating component of electric boiler;
Fig. 4 is the phase vectors figure that the electrical heating elements Y-connection is non-full-phase state among Fig. 3 on three phase mains;
Fig. 5 is the electrical schematic diagram that lacks (breaking) phase alarm protecting apparatus first embodiment according to the electric heating component of electric boiler of the present invention's proposition;
Fig. 6 is the electrical schematic diagram that lacks (breaking) phase alarm protecting apparatus second embodiment of electric heating component of electric boiler of the present invention;
Fig. 7 is the electrical schematic diagram that lacks (breaking) phase alarm protecting apparatus the 3rd embodiment of electric heating component of electric boiler of the present invention.
Embodiment
See also illustrated in figures 1 and 2ly, wherein, Fig. 1 is the theoretical electrical schematic diagram of the phase-lacking protective device of electric heating component of electric boiler, and Fig. 2 is the phase vectors figure of electrical heating elements Y-connection on three phase mains among Fig. 1.
From result of the test and theory analysis, propose a kind of electrical heating elements of the Y-connection of neutral lead that is applicable to and lack the design considerations of (breaking) phase protection device:
DRA, DRB, DRC are the electric heating assembly DR that is connected on A, B, the C three phase mains among Fig. 1.Circuit breaker CB is serially connected between electric heating assembly DR neutral point O end and the three-phase four-wire system power supply center line N.Circuit breaker CB is provided with the auxiliary contact CBf of synchronous interaction, when system normally moved, under the perfect condition, three electrical heating elements DRA, DRB on the same group, resistance size and the character of DRC were identical, be three-phase balancing load, each phase current IAO end, IBO end, ICO hold effective value identical at this moment; Its polar plot as shown in Figure 2, phase place respectively differs 120 degree, it must be zero that the electric current I ON end=IAO end+IBO end+ICO of the circuit breaker CB that flows through holds, it is constant that then circuit breaker CB keeps its original on-state.
See also Fig. 3 and shown in Figure 4, Fig. 3 is the electrical schematic diagram of non-full-phase state in the phase-lacking protective device of electric heating component of electric boiler; Fig. 4 is the phase vectors figure that the electrical heating elements Y-connection is non-full-phase state among Fig. 3 on three phase mains.A certain fracture in three electrical heating elements on the same group, (breaking) phase fault has promptly taken place to lack, in Fig. 3, be example mutually with A, suppose that DRA is blown, then AO end branch road is opened a way, and the electric current I AO end of the A phase of flowing through this moment is zero, the electric current I ON end=IAO end+IBO end+ICO end=0+IBO end+ICO end ≠ 0 of the circuit breaker CB that flows through so, its effective value is the effective value of former A phase current IAO end, and direction is opposite with the IAO end; Polar plot as shown in Figure 4, when promptly fault took place, the current effective value in the ON branch road increased sharply to former phase current effective value from zero.Be serially connected in circuit breaker CB in the ON branch road with instantaneous operation this moment, and normally-closed contact disconnects, the control loop work that is connected with auxiliary contact CBf, thus play a protective role; The auxiliary contact CBf of circuit breaker CB can also take place when lacking (breaking) phase fault so by the signal input part of cable access industrial control computer, the CBf action, this signal can make it make respective reaction, to satisfy required function after being accepted by industrial control computer as required.
In fact, because the parameter of three electrical heating elements on the same group can not be identical, therefore the electric current in the ON branch road can not definitely be zero under the situation of normal operation, always has certain numerical value, and this value size depends on the symmetry of three electrical heating elements.Usually generally all pass through strict the selection when the assembling electrical heating elements, make the resistance of composition three electrical heating elements on the same group basic identical, therefore, this value is not too large, generally in 1A.Actual when selecting circuit breaker CB for use, for guaranteeing reliability, generally select rated current between 2-3A, guaranteeing not misoperation when the normal operation, and when scarce (breaking) phase fault generation, can work like clockwork.
See also shown in Figure 5ly, this is the electrical schematic diagram that lacks (breaking) phase alarm protecting apparatus first embodiment of electric heating component of electric boiler of the present invention.Among Fig. 5, be located at and adopt Y-connection to constitute electric heating assembly DR by three electrical heating elements DRA, DRB, DRC in the electrically heated boilers, between the neutral line N of the neutral point O end of three electrical heating elements DRA, DRB, DRC and three-phase alternating current, be provided with the phase shortage alarm protecting apparatus; This phase shortage alarm protecting apparatus comprises:
One circuit breaker CB, this circuit breaker CB is provided with the contact of a plurality of synchronous interactions, be provided with two normally-closed contact CB1 that keep strokes and normally-closed contact CB2 in the present embodiment, normally-closed contact CB1 is serially connected between the neutral line N of the neutral point O end of electric heating assembly DR and three-phase alternating current;
One open-phase protection parts, these open-phase protection parts are connected the normally-closed contact CB2 of circuit breaker CB, the open-phase protection parts comprise, an one stop button TA and a start button QA, the contact of stop button TA is connected with circuit breaker CB normally-closed contact CB2, another contact is connected with start button QA one contact, and a contactor C who is serially connected between start button QA and the three-phase alternating current electrical neutral axis N; This contactor C is provided with a plurality of contacts, in the present embodiment, contact C1, C2, C3 are serially connected in respectively between electrical heating elements DRA and three-phase alternating current A, electrical heating elements DRB and three-phase alternating current B, electrical heating elements DRC and the three-phase alternating current C, and contact C4 and start button QA also connect; Start button QA, stop button TA and contactor C have controlled putting into operation and stopping transport of three electrical heating elements DRA, DRB, DRC.
In the present embodiment; when electrical heating elements takes place to lack (breaking) phase fault under normal operation conditions; the normally-closed contact CB1 of circuit breaker CB disconnects; normally-closed contact CB2 disconnects the control loop of open-phase protection parts immediately; make contactor C outage; contact C1, the C2 of contactor C, C3 also promptly disconnect, thereby make three electrical heating elements DRA, DRB, DRC withdraw from the state of putting into operation, and play the effect of protection.
See also shown in Figure 6ly, this is the electrical schematic diagram that lacks (breaking) phase alarm protecting apparatus second embodiment of electric heating component of electric boiler of the present invention.Among Fig. 6, be located at and adopt Y-connection to constitute electric heating assembly DR by three electrical heating elements DRA, DRB, DRC in the electrically heated boilers, between the neutral line N of the neutral point O end of three electrical heating elements DRA, DRB, DRC and three-phase alternating current, be provided with the phase shortage alarm protecting apparatus; Different with first embodiment (Fig. 5) is that the phase shortage alarm protecting apparatus comprises: a circuit breaker CB, a phase shortage warning piece.Wherein,
Circuit breaker CB is provided with two synchronous interactions in the present embodiment and moves opposite contact CB1 and CB2, and normally-closed contact CB1 is serially connected between the neutral line N of the neutral point of electric heating assembly DR and three-phase alternating current;
The open-phase protection parts are connected the end of circuit breaker CB normally opened contact CB2, promptly the open-phase protection parts be connected three-phase alternating current A and three-phase alternating current neutral line N between, stop button TA one contact of three-phase alternating current A and open-phase protection parts is connected;
The phase shortage warning piece is connected the other end of normally opened contact CB2, be the phase shortage warning piece neutral line N that is connected the other end of normally opened contact CB2 and three-phase alternating current between, this phase shortage warning piece is made up of a signal lamp XD who is connected in parallel to each other and a buzzer DL, and the other end of phase shortage warning piece is connected with three-phase alternating current electrical neutral axis N.
In the present embodiment, when (breaking) phase fault takes place to lack under normal operation conditions electrical heating elements, circuit breaker CB action, normally-closed contact CB1 among the circuit breaker CB disconnects, normally opened contact CB2 demand working phase shortage warning piece loop, signal lamp XD lights, and indication lacks (breaking) phase fault and takes place, simultaneously, buzzer DL sounds the alarm; Play the warning effect.
See also shown in Figure 7ly, this is the electrical schematic diagram that lacks (breaking) phase alarm protecting apparatus the 3rd embodiment of the electric heating component of electric boiler that proposes of the present invention.Among Fig. 7, be located at and adopt Y-connection to constitute electric heating assembly DR by three electrical heating elements DRA, DRB, DRC in the electrically heated boilers, between the neutral line N of the neutral point O end of three electrical heating elements DRA, DRB, DRC and three-phase alternating current, be provided with the phase shortage alarm protecting apparatus; The phase shortage alarm protecting apparatus comprises: a circuit breaker CB, open-phase protection parts, a phase shortage warning piece.Wherein,
Circuit breaker CB is provided with three contacts in the present embodiment, i.e. normally-closed contact CB1, normally-closed contact CB2 and normally opened contact CB3, and wherein, normally-closed contact CB1 is serially connected between the neutral line N of the neutral point of electric heating assembly DR and three-phase alternating current;
The open-phase protection parts are connected with circuit breaker CB normally-closed contact CB2, promptly the open-phase protection parts be connected three-phase alternating current A and three-phase alternating current neutral line N between, wherein, stop button TA one contact of three-phase alternating current A and open-phase protection parts is connected;
The phase shortage warning piece is connected with circuit breaker CB normally opened contact CB3, promptly the phase shortage warning piece be connected three-phase alternating current A and three-phase alternating current neutral line N between.
In the present embodiment, when (breaking) phase fault takes place to lack under normal operation conditions electrical heating elements, circuit breaker CB action, normally-closed contact CB1 among the circuit breaker CB disconnects, normally-closed contact CB2 among the circuit breaker CB also disconnects the control loop of open-phase protection parts, make contactor C outage, the contact C1 of contactor C, C2, C3 also promptly disconnects, thereby makes three electrical heating elements DRA, DRB, DRC withdraws from the state of putting into operation, meanwhile, normally opened contact CB3 closure among the circuit breaker CB, connect phase shortage warning piece loop, signal lamp XD lights, and indication lacks (breaking) phase fault and takes place, simultaneously, buzzer DL sounds the alarm; Thereby play the effect of reporting to the police with protection.
In above-mentioned first, second and third embodiment, the auxiliary contact of circuit breaker CB are normally-closed contact CB2 and normally opened contact CB3, can also be by the signal input part of cable access industrial control computer, take place when lacking (breaking) phase fault so, CB1, CB2 and CB3 corresponding actions, this signal can make it make respective reaction, to satisfy required function after being accepted by industrial control computer as required.
From as can be known above-mentioned, in the electrically heated boilers electric heating system, after being provided with phase shortage alarm protecting apparatus of the present invention, in case certain root electrical heating elements fracture, corresponding protective device just can move in the several seconds, indicate this group that scarce (breaking) phase fault is arranged, can determine whether to need to disconnect control loop simultaneously as required; In electrically heated boilers, be provided with supporting many groups phase shortage alarm protecting apparatus with many group electric heating assembly DR, after having used this device in the electric heating system, thereby not only solved because all problems that electrical heating elements fracture itself causes scarce (breaking) phase fault to bring has played the effect of reporting to the police with protection to load-side; Simultaneously, can play the alarm and protection effect equally to the phase shortage of the part more than the electrical heating elements in electrically heated boilers, promptly the phase shortage to mains side can play the alarm and protection effect equally.
In sum, electric heating component of electric boiler of the present invention lack (break) phase alarm protecting apparatus owing in protective device, being provided with circuit breaker CB with a plurality of normally closed or normally opened contacts, this circuit breaker CB is connected with control loops such as phase shortage warnings with open-phase protection, perhaps the signal input part by cable access industrial control computer connects, therefore, when electrical heating elements DR was in operation the damage of generation phase shortage, energy is detection failure in time, and controls the work of its control loop; Simultaneously, owing to be provided with contactor C in protective device, when the phase shortage damage took place electrical heating elements DR, circuit breaker CB control electrical heating elements withdrawed from the state of putting into operation, and has improved the safety in utilization of electrically heated boiler; In addition, the convenient and dependable performance of protective device Installation and Debugging, therefore very practical.
Claims (5)
1. an electric heating component of electric boiler lacks (breaking) phase alarm protecting apparatus, comprise: be located at the electric heating assembly DR that adopts Y-connection to constitute by three electrical heating elements DRA, DRB, DRC in the electrically heated boilers, the neutral point O end of three electrical heating elements DRA, DRB, DRC is connected with the neutral line N of three-phase alternating current; It is characterized in that:
Between the neutral line N of the neutral point O end of described three electrical heating elements DRA, DRB, DRC and three-phase alternating current, be provided with the phase shortage alarm protecting apparatus; This phase shortage alarm protecting apparatus comprises:
One circuit breaker CB, this circuit breaker CB is provided with the contact of a plurality of synchronous interactions, and normally-closed contact CB1 is serially connected between the neutral line N of the neutral point of electric heating assembly DR and three-phase alternating current;
One open-phase protection parts, these open-phase protection parts are connected the normally-closed contact CB2 of circuit breaker CB, the open-phase protection parts comprise, an one stop button TA and a start button QA, the contact of stop button TA is connected with circuit breaker CB normally-closed contact CB2, another contact is connected with start button QA one contact, and a contactor C who is serially connected between start button QA and the three-phase alternating current electrical neutral axis N; This contactor C is provided with a plurality of contacts, and contact C1, C2, C3 are serially connected in respectively between electrical heating elements DRA and three-phase alternating current A, electrical heating elements DRB and three-phase alternating current B, electrical heating elements DRC and the three-phase alternating current C; Contact C4 and start button QA also connect.
Electric heating component of electric boiler as claimed in claim 1 lack (breaking) phase alarm protecting apparatus, it is characterized in that:
The contact CB1 of two synchronous interactions of described circuit breaker CB and CB2 action is opposite, and normally-closed contact CB1 is serially connected between the neutral line N of the neutral point of electric heating assembly DR and three-phase alternating current; The end of normally opened contact CB2 is connected with stop button TA one contact of three-phase alternating current A and open-phase protection parts;
Described this phase shortage alarm protecting apparatus also comprises: a phase shortage warning piece; one end of this phase shortage warning piece is connected the other end of described circuit breaker CB normally opened contact CB2; the phase shortage warning piece is made up of a signal lamp XD who is connected in parallel to each other and a buzzer DL, and the other end of phase shortage warning piece is connected with three-phase alternating current electrical neutral axis N.
Electric heating component of electric boiler as claimed in claim 1 lack (breaking) phase alarm protecting apparatus, it is characterized in that:
Described circuit breaker CB is provided with a plurality of contact CB1, CB2, CB3, and normally-closed contact CB1 is serially connected between the neutral line N of the neutral point of electric heating assembly DR and three-phase alternating current; Normally-closed contact CB2 be serially connected in three-phase electricity A and the open-phase protection parts formed by a stop button TA, a start button QA and a contactor C between; Normally opened contact CB3 be serially connected in three-phase alternating current A and the phase shortage warning piece formed by signal lamp XD and buzzer DL between.
Electric heating component of electric boiler as claimed in claim 1 lack (breaking) phase alarm protecting apparatus, it is characterized in that:
The relevant contacts of described circuit breaker CB is connected with the signal input part of industrial control computer by cable.
Electric heating component of electric boiler as claimed in claim 1 lack (breaking) phase alarm protecting apparatus, it is characterized in that:
In described electrically heated boilers, be provided with supporting many groups phase shortage alarm protecting apparatus with many group electric heating assembly DR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021113173A CN100353629C (en) | 2002-04-10 | 2002-04-10 | Phase loss (off) alarm protector for electric heating component of electric boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021113173A CN100353629C (en) | 2002-04-10 | 2002-04-10 | Phase loss (off) alarm protector for electric heating component of electric boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1450701A true CN1450701A (en) | 2003-10-22 |
| CN100353629C CN100353629C (en) | 2007-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021113173A Expired - Fee Related CN100353629C (en) | 2002-04-10 | 2002-04-10 | Phase loss (off) alarm protector for electric heating component of electric boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN100353629C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297492A (en) * | 2010-05-27 | 2011-12-28 | 三洋电机株式会社 | Air conditioner |
| CN105135600A (en) * | 2015-08-10 | 2015-12-09 | 珠海格力电器股份有限公司 | Control method, device and system of three-phase electric auxiliary heater and air conditioner |
| CN109873558A (en) * | 2017-12-04 | 2019-06-11 | 中国船舶重工集团海装风电股份有限公司 | A kind of precharge of current transformer and heater circuit and its control method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2069969U (en) * | 1988-12-31 | 1991-01-23 | 范继芳 | Alarm for reciprocating grate |
| CN2133963Y (en) * | 1992-06-18 | 1993-05-19 | 王承柏 | Flash relay for phase interruption or single-phase ground protection |
| CN2240102Y (en) * | 1994-09-06 | 1996-11-13 | 李福祚 | Full-automatic safety protecting alarming control device for boilers |
| CN2545736Y (en) * | 2002-04-10 | 2003-04-16 | 上海工业锅炉研究所 | Phase interruption alarm protecting device of electric heating element for electric boiler |
-
2002
- 2002-04-10 CN CNB021113173A patent/CN100353629C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297492A (en) * | 2010-05-27 | 2011-12-28 | 三洋电机株式会社 | Air conditioner |
| CN102297492B (en) * | 2010-05-27 | 2014-02-19 | 三洋电机株式会社 | Air conditioner |
| CN105135600A (en) * | 2015-08-10 | 2015-12-09 | 珠海格力电器股份有限公司 | Control method, device and system of three-phase electric auxiliary heater and air conditioner |
| CN105135600B (en) * | 2015-08-10 | 2018-04-13 | 珠海格力电器股份有限公司 | Three-phase electricity auxiliary hot control method, apparatus and system and air conditioner |
| CN109873558A (en) * | 2017-12-04 | 2019-06-11 | 中国船舶重工集团海装风电股份有限公司 | A kind of precharge of current transformer and heater circuit and its control method |
| CN109873558B (en) * | 2017-12-04 | 2020-07-14 | 中国船舶重工集团海装风电股份有限公司 | Converter pre-charging and heating circuit and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN100353629C (en) | 2007-12-05 |
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