CN102881517B - Auxiliary contact device with two-station protection - Google Patents
Auxiliary contact device with two-station protection Download PDFInfo
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- CN102881517B CN102881517B CN201110193483.8A CN201110193483A CN102881517B CN 102881517 B CN102881517 B CN 102881517B CN 201110193483 A CN201110193483 A CN 201110193483A CN 102881517 B CN102881517 B CN 102881517B
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Abstract
The invention relates to an auxiliary contact device with two-station protection. The auxiliary contact device with two-station protection comprises a box body, the box body internally contains an auxiliary contact support, at least one pair of normally-closed auxiliary contacts and two pairs of normally-open auxiliary contacts, wherein the auxiliary contact support is used for supporting a movable auxiliary contact; the normally-closed auxiliary contacts are connected with a forcible discharge resistor in series; the two pairs of normally-open auxiliary contacts are connected with damping resistors in series, and the damping resistors between the two pairs of normally-open auxiliary contacts are connected in parallel. The clearances of the two pairs of normally-open auxiliary contacts are different. Surge peak current in a limiting circuit can be timely and fast limited through a group of damping resistors additionally arranged, so that the surge peak current is rapidly reduced to a set value. The auxiliary contact device is especially applicable to protect a main contact of a contactor, the damping resistors and a capacitor group in lines from being damaged or shortened in service life due to surge current peak values generated by capacitor load, an inductor load or the mixed load of a capacitor and an inductor.
Description
Technical field
The present invention relates to a kind of auxiliary contact device of contactor, the auxiliary contact device of the contactor particularly with two segment protects, belongs to Low Voltage Electrical Apparatus.
Background technology
Contactor is large as one amount, wide control apparatus, for in control circuit, remote connection, divide deenergizing and control motor starting, stop, disjunction in running, the switching of Capacitor banks, power factor compensation etc., particularly there is heating, refrigeration, frequency conversion, electromagnet, in the fields of employment such as lifting, because there is capacity load, inductive load or capacitive character, inductive mixed load, these equipment operationally, larger than rated operational current 100 times can be produced in circuit, the surge current of even higher multiple, the main contact of this surge current to contactor has great infringement, its electrical endurance can be reduced, even burn contactor.
At present, in the world, on domestic market, for limit inrush currents is to the adverse effect of main noddle on contactor, the scheme generally adopted is: increase auxiliary contact group on the contactor, for avoiding not normal (the main contact welding of contactor of power, overheating etc.), peak current of short duration and large when the main contact that contactor must bear the permanent electric current and contactor reaching Capacitor banks rated current 1.5 times closes, by the damping resistance of auxiliary contact group configuration, or damping resistance is associated with the main contact of contactor with the loop of forced electric discharge resistance, realize the restriction to surge current, and then develop switching capacitor contactor.
This kind of switching capacitor contactor common design is that the normally open contact of auxiliary contact group is connected two damping resistances, normally open contact is connected in advance before the main contact of contactor is connected, disjunction again of having no progeny is divided at main contact, in several millisecond, surge current is limited in less than 20 times of rated operational current, achieve the infringement of limit inrush currents to the main contact of contactor, improve its electrical endurance: the normally closed interlock group of auxiliary contact group is connected a forced electric discharge resistance, when the main contact of contactor divides to have no progeny forced electric discharge is carried out to Capacitor banks, to ensure that Capacitor banks its residual voltage when second time is thrown in is not more than 50V, the main contact of damping resistance and contactor is avoided to damage.This kind of main contact to contactor realizes the expression of first degree protection of connection, disjunction, and we are referred to as one-part form protection.
But; this one-part form protection existence one defect; as: in low-pressure industrial facility; Capacitor banks is mainly used in the compensation (raising power factor) of reactive power; when these Capacitor banks are energized; (1ms-2ms) generation significantly (100 times of rated current will be reached, the electric current of even higher multiple) and the overcurrent of high-frequency (3kHz-15kHz) during transient process.The amplitude of this current peak is called " surge peak current ", and its size is main relevant to following factor:
1. net inductive:
2. transformer efficiency and short-circuit voltage:
3. power factor compensation type.
When contactor is when connecting Capacitor banks; during the main contact of contactor, described auxiliary contact group are run all at the same time; there is damping resistance in several millisecond; surge current cannot be limited in less than 20 times of rated operational current or directly damping resistance be burnt; the object that the main contact that can not reach protection contactor injures from surge current; in other words; the speed that the protection of this one-part form makes surge peak current sharply decline is inadequate, there is the hidden danger of scaling loss damping resistance, main noddle on contactor, Capacitor banks.
Summary of the invention
In view of above-mentioned background; the object of this invention is to provide the auxiliary contact device of a kind of band two segment protects; it can make surge peak current sharply decline; reach and protect the main contact of contactor, damping resistance, Capacitor banks to escape injury, the effect of the electrical endurance of raising contactor, Capacitor banks, damping resistance.
For achieving the above object, the present invention adopts following technical scheme:
An auxiliary contact device for band two segment protects, comprises a casing, it is characterized in that:
The auxiliary contact support supporting dynamic auxiliary contact is held in described casing:
At least one pair of normally closed auxiliary contact and two is held to often opening auxiliary contact in described casing:
Described normally closed interlock series connection forced electric discharge resistance:
Described two pairs of equal series damping resistors of normally open contact, the damping resistance between two pairs of normally open contacts is connected in parallel.
Further:
Described auxiliary contact support is driven by the main contact support of contactor.
The clearance between open contacts of described two pairs of normally open contacts is not identical.
When the main contact support of contactor and auxiliary contact are supported in the process run simultaneously; because two exist a difference to the clearance between open contacts often opening auxiliary contact; by two to often open dynamic auxiliary contact and quiet auxiliary contact on auxiliary contact connect or disjunction time position there is twice change; namely access damping resistance value in loop and twice change occurs; complete twice restriction surge peak current; compare with above-mentioned switching capacitor contactor, add a segment protect, therefore be called that two-period form is protected.
The invention has the beneficial effects as follows:
Compared with general switching capacitor contactor, this auxiliary contact device is by increase by one group of damping resistance, reach contactor in connection, disjunction is because of capacity load in circuit, inductive load, or capacitive character, during the larger surge current that inductive mixed load produces, can be timely, surge peak current rapidly in limiting circuit, surge peak current is made sharply to drop to setting, ensure the normal work of contactor, achieve the main contact of limit inrush currents to contactor, Capacitor banks, the infringement of damping resistance, improve contactor, Capacitor banks, the electrical endurance of damping resistance.
Accompanying drawing explanation
Fig. 1 is schematic circuit of the present invention:
Fig. 2 is the schematic diagram that the present invention is in initial position:
Fig. 3 is the schematic diagram of the present invention's first pair of normally open contact group when closing:
Fig. 4 be the present invention's two pairs of normally open contact groups completely closed time schematic diagram.
Embodiment
The invention provides the auxiliary contact device of a kind of band two segment protects; it can meet contactor at connection, disjunction capacity load, inductive load; or when capacitive character, inductive mixed load; the servicing unit of the surge peak current that quick restriction produces in circuit; reduce from the injury of surge peak current the situation that its electrical endurance even burns contactor and Capacitor banks to protect the main contact of contactor, Capacitor banks etc.; it can realize combining with contactor easily, forms a switching capacitor contactor.
Auxiliary contact device of the present invention comprises casing, and pedestal, auxiliary contact support, some auxiliary contacts, forced electric discharge resistance, damping resistance, wire are housed in casing.Often pair of auxiliary contact is made up of dynamic auxiliary contact and quiet auxiliary contact, and this dynamic auxiliary contact can realize connecting and disjunction with quiet auxiliary contact, and this is changed to the state of auxiliary contact.At least one pair of normally closed auxiliary contact and two is held to often opening auxiliary contact, wherein: normally closed interlock series connection forced electric discharge resistance: two pairs of equal series damping resistors of normally open contact, the damping resistance between two pairs of normally open contacts is connected in parallel in casing of the present invention.
Described auxiliary contact device can be arranged on a contactor (electromagnetic type, magneto, electronic type etc.), drives to make the main contact support of auxiliary contact support energy contactor.
When the control loop energising of contactor, the main contact support of contactor runs downwards, auxiliary contact is supported that the main contact support of contactor drives and is run downwards, first auxiliary contact support drives normally closed auxiliary contact disjunction, then, often open in auxiliary contact the auxiliary contact of often opening opened apart from less for two pairs to connect, access one group of damping resistance, complete the restriction of first stage to the surge peak current that contactor produces in connection process: after auxiliary contact support continues to run certain distance downwards, often open in auxiliary contact the auxiliary contact of often opening opened apart from larger for two pairs to connect, another group damping resistance of access in parallel, complete the restriction of second stage to the surge peak current that contactor produces in connection process: after auxiliary contact support continues to run certain distance downwards again, the main contact of contactor is just connected, so far achieve two to connect in advance often opening before the main contact of auxiliary contact at contactor is connected, reach the object of the surge peak current that Restricted Contact device produces in connection process.
When the control loop power-off of contactor, the main contact support of contactor upwards runs, auxiliary contact is supported that the main contact support of contactor drives and is upwards run, first the main contact support of contactor drives the main contact disjunction of contactor, then, after auxiliary contact support continues upwards to run certain distance, often open in auxiliary contact to open for two pairs and often open the first disjunction of auxiliary contact apart from larger, disconnect one group of damping resistance, complete the restriction of first stage to the surge peak current that contactor produces in breaking course: after auxiliary contact support continues upwards to run certain distance again, often open in auxiliary contact to open for two pairs and often open auxiliary contact disjunction again apart from less, disconnect another group damping resistance, complete the restriction of second stage to the surge peak current that contactor produces in breaking course, so far achieving two divides inborn ability of having no progeny to break to often opening the main contact of auxiliary contact at contactor, reach the object of the surge peak current that Restricted Contact device produces in breaking course: last, after auxiliary contact support continues upwards to run certain distance again, normally closed auxiliary contact is connected, access forced electric discharge resistance, realize the forced electric discharge to Capacitor banks, to ensure that Capacitor banks its residual voltage when second time is thrown in is not more than 50V, the main contact of damping resistance and contactor is avoided to damage.
Further illustrate below in conjunction with the drawings and specific embodiments:
It is the schematic circuit of auxiliary contact device of the present invention shown in Fig. 1.
When initial condition, normally closed auxiliary contact 6 (being made up of the dynamic auxiliary contact 61 of activity, static quiet auxiliary contact 62) closes, the normally closed auxiliary contact 6 connected is in on-state, forced electric discharge resistance 5 and Capacitor banks are connected: now, often open auxiliary contact 2 (being made up of dynamic auxiliary contact 21, quiet auxiliary contact 22) open apart from be greater than often open auxiliary contact 4 (being made up of work auxiliary contact 41, quiet auxiliary contact 42) open distance.
Principle of the present invention is:
When initial condition, auxiliary contact 6 closes, and the normally closed auxiliary contact connected is in closure state, and forced electric discharge resistance 5 is connected in the line, this often open auxiliary contact group 2 open apart from be greater than often open auxiliary contact group 4 open distance.
When the control loop energising of contactor, in running, auxiliary contact sequence of movement is: first normally closed auxiliary contact 6 disconnects to drive auxiliary contact to support in the main contact support of contactor, often open auxiliary contact 4 to close subsequently, then, often open auxiliary contact 2 and close, main contact finally closes.Often open when often to open auxiliary contact 4 and be closed auxiliary contact 2 not closed time; the restriction of the surge peak current utilizing damping resistance 3 pairs of contactors to produce in connection process in circuit; this is the first paragraph protection in contactor connection process; after this; main contact support drives auxiliary contact support to continue to run; drive is often opened auxiliary contact 2 and is closed subsequently; now; in circuit except damping resistance 3 limit inrush currents peak value; damping resistance 1 in parallel again limits surge peak current, and this be that second segment in contactor connection process is protected.This process just achieves: two often open auxiliary contact 2,4 connects in advance before the main contact of contactor is connected, and reaches the object of the surge peak current that Restricted Contact device produces in connection process.
When the control loop power-off of contactor, auxiliary contact is driven to support in running in the main contact support of contactor, first the main contact of contactor disconnects, then, auxiliary contact 4 and auxiliary contact 2 disconnect successively, when the main contact of contactor disconnects, auxiliary contact 2 does not disconnect, the restriction of the surge peak current utilizing damping resistance 1 pair of contactor to produce in breaking course in circuit, this is the first paragraph protection in contactor breaking course, after this, main contact support drives auxiliary contact support to continue to run, drive is often opened auxiliary contact 4 and is disconnected subsequently, now, in circuit except damping resistance 1 limit inrush currents peak value, damping resistance 3 in parallel again limits surge peak current, this is the second segment protection in contactor breaking course.This process just achieves: often open auxiliary contact 2,4 and divide inborn ability of having no progeny to break at the main contact of contactor, reach the object of the surge peak current that Restricted Contact device produces in breaking course: last, after auxiliary contact support continues to run certain distance again, normally closed auxiliary contact 6 is connected, access forced electric discharge resistance 5, realize the forced electric discharge to Capacitor banks, to ensure that Capacitor banks its residual voltage when second time is thrown in is not more than 50V, avoid the main contact of damping resistance 1,3 and contactor to damage.
It is the schematic diagram that auxiliary contact device of the present invention is in initial position shown in Fig. 2.
Wire A connects the 1L1 end of contactor, wire B connects the 4T2 end of contactor, wire C connects the 2T1 end of contactor, movable auxiliary contact 21,41,61 is installed on auxiliary contact and supports on 7, static auxiliary contact 22,42,62 is installed on pedestal 8, under this state, the damping resistance 1 of A end and C end, controlled by auxiliary contact group 2, damping resistance 3 is controlled by auxiliary contact group 4, that wherein often opens auxiliary contact group 2 opens the forced electric discharge resistance 5 opened apart from H2:B end and C end being greater than auxiliary contact group 4 apart from H1, is controlled by auxiliary contact group 6.
The schematic diagram of auxiliary contact device of the present invention first pair of normally open contact when closing shown in Fig. 3.
First pair of process often opening auxiliary contact 4 closed is: auxiliary contact is supported that the main contact support of 7 contactors drives and run downwards, first auxiliary contact support 7 drives the disjunction of normally closed auxiliary contact 6, then, often open auxiliary contact 4 to connect, access one group of damping resistance 3, complete the restriction of first stage to surge peak current.
Shown in Fig. 4 be two pairs of normally open contacts of auxiliary contact device of the present invention completely closed time schematic diagram.
When the control loop energising of contactor, the main contact support of contactor runs downwards, auxiliary contact is supported that the main contact support of 7 contactors drives and is run downwards, first auxiliary contact support 7 drives the disjunction of normally closed auxiliary contact 6, then, often open auxiliary contact 4 to connect, access one group of damping resistance 3, complete the restriction of first stage to the surge peak current that contactor produces in connection process: after auxiliary contact supports 7 to continue to run certain distance downwards, often open auxiliary contact 2 to connect, access another group damping resistance 1, complete the restriction of second stage to the surge peak current that contactor produces in connection process: after auxiliary contact supports 7 to continue to run certain distance downwards again, the main contact of contactor is just connected, now, just achieve two to often opening auxiliary contact 2, 4 connect in advance before the main contact of contactor is connected, reach the object of the surge peak current that Restricted Contact device produces in connection process.
During the power-off of contactor control loop, the sequence of movement of contact is:
When the control loop power-off of contactor, the main contact support of contactor upwards runs, auxiliary contact is supported that the main contact support of 7 contactors drives and is upwards run, first the main contact support of contactor drives the main contact disjunction of contactor, then, after auxiliary contact supports 7 to continue upwards to run certain distance, often open auxiliary contact 2 disjunction, disconnect one group of damping resistance 1, complete the restriction of first stage to the surge peak current that contactor produces in breaking course: after auxiliary contact support 7 continues upwards to run certain distance again, often open auxiliary contact 4 disjunction, disconnect another group damping resistance 3, complete the restriction of second stage to the surge peak current that contactor produces in breaking course, now, just achieve and often open auxiliary contact 2, 4 divide inborn ability of having no progeny to break at the main contact of contactor, reach the object of the surge peak current that Restricted Contact device produces in breaking course: last, after auxiliary contact support 7 continues upwards to run certain distance again, normally closed auxiliary contact 6 is connected, access forced electric discharge resistance 5, realize the forced electric discharge to Capacitor banks, to ensure that Capacitor banks its residual voltage when second time is thrown in is not more than 50V, avoid damping resistance 1, 3 and contactor main contact damage.
In other embodiments of the invention:
Often open auxiliary contact for two pairs can also make out apart from H1 and be less than H2, as long as the two is opened apart from there being certain difference (not namely being 0).
Often pair often open auxiliary contact series connection damping resistance and normally closed auxiliary contact series connection forced electric discharge resistance can be one or two, also can be multiple, resistance be then chosen as required.
The above embodiments do not form any type of restriction to protection range of the presently claimed invention; claims of the present invention cover all modifications and changes; therefore, make various modifications for above-described embodiment all to belong in protection scope of the present invention with change.
Claims (1)
1. be with an auxiliary contact device for two segment protects, comprise a casing, it is characterized in that:
The auxiliary contact support supporting dynamic auxiliary contact is held in described casing;
At least one pair of normally closed auxiliary contact and two is held to often opening auxiliary contact in described casing;
The clearance between open contacts of described two pairs of normally open contacts is not identical;
Described normally closed interlock series connection forced electric discharge resistance;
Described two pairs of equal series damping resistors of normally open contact, the damping resistance between two pairs of normally open contacts is connected in parallel;
Described auxiliary contact device, the arrangement of its contact meets the requirement of sequence of movement: connection order is the normally closed auxiliary contact disjunction of the first step, second step is opened and is connected apart from less auxiliary contact of often opening, and the 3rd step is opened and connected apart from larger auxiliary contact of often opening, and the 4th step main noddle on contactor is connected; Disjunction order is the first disjunction of main contact of first step contactor, and second step is opened and often opened auxiliary contact disjunction apart from larger, and the 3rd step is opened and often opened auxiliary contact disjunction apart from less, and the 4th step is that normally closed interlock is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110193483.8A CN102881517B (en) | 2011-07-11 | 2011-07-11 | Auxiliary contact device with two-station protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110193483.8A CN102881517B (en) | 2011-07-11 | 2011-07-11 | Auxiliary contact device with two-station protection |
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| Publication Number | Publication Date |
|---|---|
| CN102881517A CN102881517A (en) | 2013-01-16 |
| CN102881517B true CN102881517B (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110193483.8A Active CN102881517B (en) | 2011-07-11 | 2011-07-11 | Auxiliary contact device with two-station protection |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319186B (en) * | 2014-11-17 | 2017-11-17 | 蒋胜泉 | The sequential relay of controllable multi-load |
| CN106207772A (en) * | 2016-07-22 | 2016-12-07 | 新疆特变电工自控设备有限公司 | The integrated control room of a kind of switch cubicle and there is its switch cubicle |
| CN116259489B (en) * | 2023-05-11 | 2023-10-17 | 成都理工大学 | Multi-bit Cheng Jieti trigger displacement switch |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3435389A (en) * | 1967-04-19 | 1969-03-25 | Allis Chalmers Mfg Co | Electromagnetic contactor having cam means for operating auxiliary switch |
| CN2055988U (en) * | 1989-08-30 | 1990-04-11 | 北京电器研究所 | Contactor suitable for fitting with capacitor |
| CN2185922Y (en) * | 1994-01-18 | 1994-12-21 | 永佳低压电器厂 | A.C. condenser contactor with current suppressor and discharge function |
| CN1215906A (en) * | 1997-10-28 | 1999-05-05 | 罗宏基 | Electric appliance switch contact system |
| CN202178214U (en) * | 2011-07-11 | 2012-03-28 | 北京人民电器厂有限公司 | Auxiliary contact device with double-section protection |
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2011
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