CN203014354U - Circuit for controlling auxiliary device of large units - Google Patents
Circuit for controlling auxiliary device of large units Download PDFInfo
- Publication number
- CN203014354U CN203014354U CN 201320002509 CN201320002509U CN203014354U CN 203014354 U CN203014354 U CN 203014354U CN 201320002509 CN201320002509 CN 201320002509 CN 201320002509 U CN201320002509 U CN 201320002509U CN 203014354 U CN203014354 U CN 203014354U
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- CN
- China
- Prior art keywords
- contactor
- auxiliary device
- circuit
- start button
- large units
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a circuit for controlling an auxiliary device of large units, and pertains to the field of control technology. The technical scheme is that the circuit for controlling an auxiliary device of large units comprises a start button, a stop button, a contactor and a time relay, wherein the normally open contact of the contactor is connected in series in the power supply loop of the large unit auxiliary device, the control coil of the contactor is connected in series with the normally open contact of the start button and the normally close contact of the stop button, and then connected with the power supply voltage; and the time delay is parallelly connected onto the control coil of the contactor, and the power-on instant close-power-off delayed open contact is parallelly connected with the normally open contact of the start button. According to the circuit for controlling an auxiliary device of large units, the time relay is used for controlling the power-off time for large unit auxiliary device low voltage protection, the delayed time of the time relay is reasonably arranged so as to prevent the phenomenon that when instant low voltage happens to the grid, the large units continue to work and the auxiliary device is power-off, thereby effectively avoiding the harm of instant low voltage to the large units, and ensuring safe operation of the large units.
Description
Technical field
The utility model relates to a kind of circuit be used to controlling large-scale unit servicing unit (as oil pump), can make the large-scale unit still can safe operation when running into instantaneous low-voltage, belongs to the control technology field.
Background technology
Existing electromotor control circuit is generally realized self-locking with the auxiliary contact of contactor, and motor is moved continuously.Fig. 1 is a kind of typical electromotor control circuit, its operation principle is: after pressing start button SB1, the control coil of contactor KM gets electric, its normally opened contact KM-1 is closed, motor M operation, its auxiliary contact KM-2 is closed simultaneously, makes the control coil of contactor KM keep getting electricity condition, even start button SB1 disconnects, motor still can remain in operation; When low-voltage appearred in electrical network, contactor KM resetted, and the auxiliary contact KM-2 of self-locking opens, and motor M shuts down, and realizes the under-voltage protection of motor.this control circuit can be used for controlling most of motor, but be not suitable for the oil pump of controlling large-scale unit, the servicing units such as water pump, this is usually by 6KV or 10KV high voltage supply because of large-scale unit, the delay time that its low voltage protection circuit is set is generally 1.5S, the duration of the instantaneous low-voltage that causes but interior other subscriber equipment of electrical network is short-circuited fault is generally less than 1S, when instantaneous low-voltage appears in electrical network, large-scale unit still can remain in operation, but its servicing unit quits work, the bearing shell of unit of being easy to like this to cause to run up damages, cause unnecessary economic loss.
The utility model content
The purpose of this utility model is the drawback for prior art, and a kind of control circuit that is applicable to large-scale unit servicing unit is provided, and makes the large-scale unit still can safe operation when running into instantaneous low-voltage.
Problem described in the utility model realizes with following technical proposals:
A kind of control circuit of large-scale unit servicing unit; it comprises start button, stop botton, contactor and the time relay; the normally opened contact of described contactor is serially connected in the current supply circuit of large-scale unit servicing unit; after being connected in series, the normally opened contact of its control coil and start button and the normally-closed contact of stop botton connect supply voltage; the described time relay is attempted by on the control coil of contactor, and its normally opened contact that gets electric instantaneous closure-dead electricity Time Delay Opening contact and start button is connected in parallel.
The control circuit of above-mentioned large-scale unit servicing unit also comprises thermal protector in formation, described thermal protector is arranged on the motor of large-scale unit servicing unit, and its normally-closed contact is serially connected in the control loop of contactor.
The control circuit of above-mentioned large-scale unit servicing unit also comprises run indicator in formation, described run indicator is attempted by on the control coil of contactor.
The utility model utilizes the time relay to control the power-off time of large-scale unit servicing unit under-voltage protection; when rationally the delay time of setup times relay can prevent that instantaneous low-voltage from appearring in electrical network; large-scale unit is still worked and the servicing unit outage; thereby effectively avoided instantaneous low-voltage to the infringement of large-scale unit, guaranteed the safe operation of large-scale unit.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the electrical schematic diagram of conventional motors control circuit;
Fig. 2 is electrical schematic diagram of the present utility model.
In figure, each label is: SB1, start button; SB2, stop botton; M, servicing unit motor; KM, contactor; The normally opened contact of KM-1, contactor; The auxiliary contact of KM-2, contactor; T, the time relay; T-1, the time relay electric instantaneous closure-dead electricity Time Delay Opening contact; HL, run indicator; QF, circuit breaker; KF, thermal protector; KF-1, thermal protector normally-closed contact.
Embodiment
Referring to Fig. 2, the utility model is the control coil two ends at the contactor KM of conventional motors control circuit, time relay T in parallel, service time relay T electric instantaneous closure-dead electricity Time Delay Opening contact T-1 replaces the auxiliary contact KM-2 of former contactor KM, realize the self-locking of motoring.
The delay time of time relay T is set as 1S; within the low-voltage 1S time, self-locking circuit keeps self-locking like this, after line voltage recovers normally; large-scale unit servicing unit (oil pump etc.) resumes operation at once, avoids the chain shutdown of large-scale unit or causes its bearing shell damage.
If the 1S that the electrical network low voltage time surpass to be set, time relay T electric instantaneous closure-dead electricity Time Delay Opening contact T-1 will discharge, large-scale unit servicing unit (oil pump etc.) outage avoids self-starting to cause equipment, personnel to injure.
The utility model is mainly used in: allow the important loads such as oil pump of starting under load, and need the strict delay time of setting; This circuit is not suitable for the equipment that water pump etc. does not allow the on-load cycling start.
Claims (3)
1. the control circuit of a large-scale unit servicing unit, it comprises start button (SB1), stop botton (SB2), contactor (KM) and the time relay (T), the normally opened contact of described contactor (KM) is serially connected in the current supply circuit of large-scale unit servicing unit, after being connected in series, the normally-closed contact of the normally opened contact of its control coil and start button (SB1) and stop botton (SB2) connects supply voltage, the described time relay (T) is attempted by on the control coil of contactor (KM), its normally opened contact that gets electric instantaneous closure-dead electricity Time Delay Opening contact and start button (SB1) is connected in parallel.
2. the control circuit of a kind of large-scale unit servicing unit according to claim 1; it is characterized in that; also comprise thermal protector (KF) in formation, described thermal protector (KF) is arranged on the motor of large-scale unit servicing unit, and its normally-closed contact is serially connected in the control loop of contactor (KM).
3. the control circuit of a kind of large-scale unit servicing unit according to claim 1 and 2, is characterized in that, also comprises run indicator (HL) in formation, and described run indicator (HL) is attempted by on the control coil of contactor (KM).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002509 CN203014354U (en) | 2013-01-05 | 2013-01-05 | Circuit for controlling auxiliary device of large units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002509 CN203014354U (en) | 2013-01-05 | 2013-01-05 | Circuit for controlling auxiliary device of large units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203014354U true CN203014354U (en) | 2013-06-19 |
Family
ID=48605911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320002509 Expired - Fee Related CN203014354U (en) | 2013-01-05 | 2013-01-05 | Circuit for controlling auxiliary device of large units |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203014354U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444615A (en) * | 2016-11-23 | 2017-02-22 | 淮南矿业(集团)有限责任公司 | Instant starting and stopping delaying circuit and adhesive tape machine including circuit |
| CN107728091A (en) * | 2017-09-20 | 2018-02-23 | 国网天津市电力公司电力科学研究院 | A kind of device for being used to supervise Existing during Partial Discharge Test for Transformer quality |
| CN110410309A (en) * | 2019-08-02 | 2019-11-05 | 南京钢铁股份有限公司 | Large-scale compressor set auxiliary machinery method for monitoring operation states |
| CN111555663A (en) * | 2020-05-25 | 2020-08-18 | 天津索龙电子科技有限公司 | Motor starting and stopping system and method based on micro-motor action |
-
2013
- 2013-01-05 CN CN 201320002509 patent/CN203014354U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444615A (en) * | 2016-11-23 | 2017-02-22 | 淮南矿业(集团)有限责任公司 | Instant starting and stopping delaying circuit and adhesive tape machine including circuit |
| CN107728091A (en) * | 2017-09-20 | 2018-02-23 | 国网天津市电力公司电力科学研究院 | A kind of device for being used to supervise Existing during Partial Discharge Test for Transformer quality |
| CN110410309A (en) * | 2019-08-02 | 2019-11-05 | 南京钢铁股份有限公司 | Large-scale compressor set auxiliary machinery method for monitoring operation states |
| CN110410309B (en) * | 2019-08-02 | 2021-05-11 | 南京钢铁股份有限公司 | Method for monitoring running state of auxiliary machine of large compressor unit |
| CN111555663A (en) * | 2020-05-25 | 2020-08-18 | 天津索龙电子科技有限公司 | Motor starting and stopping system and method based on micro-motor action |
| CN111555663B (en) * | 2020-05-25 | 2023-06-06 | 天津索龙电子科技有限公司 | Motor start-stop system and method based on micro-motor action |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20160105 |