CN211150346U - Control circuit for preventing disconnecting link from being switched on and off by mistake - Google Patents
Control circuit for preventing disconnecting link from being switched on and off by mistake Download PDFInfo
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- CN211150346U CN211150346U CN201921837998.5U CN201921837998U CN211150346U CN 211150346 U CN211150346 U CN 211150346U CN 201921837998 U CN201921837998 U CN 201921837998U CN 211150346 U CN211150346 U CN 211150346U
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Abstract
The utility model discloses a control loop for preventing the disconnecting link from being switched on and off by mistake, which relates to the technical field of power supply and distribution circuit systems and comprises a control loop and a three-phase motor power loop; the control loop comprises at least two control branches connected in parallel, each control branch comprises a first normally open contact, a closing coil and a monitoring normally open contact which are sequentially connected in series, and the first normally open contact is connected with a closing button in parallel; the three-phase motor power circuit comprises three-phase motors and voltage monitoring relays, wherein the three-phase motors and the voltage monitoring relays are the same as the control branches in number, the motor switches are used for starting and stopping all the three-phase motors, each three-phase motor is connected with a three-phase alternating current power supply, a second normally open contact of the voltage monitoring relays and a closing coil is connected to a circuit of each three-phase motor connected with the three-phase alternating current power supply, and the voltage monitoring relays are used for controlling and monitoring the action of the normally open contact switches. The utility model discloses the system return circuit relates to the design simply, and can effectively prevent the switch mistake deciliter that leads to when the motor switch malfunction.
Description
Technical Field
The utility model relates to a supply and distribution circuit technical field, concretely relates to prevent control circuit of switch mistake deciliter.
Background
The disconnecting link is used as an important primary power transformation device and mainly has the main function of disconnecting a high-voltage primary circuit as an obvious disconnection point, if the disconnecting link is switched on and off by mistake, protection action occurs to enlarge the accident range, and if the disconnecting link is damaged by mistake, the device is damaged, even personal injury is possibly caused, so that the condition that the disconnecting link is not switched on and off by mistake when no switching-on and switching-off command is generated by the disconnecting link is ensured to be an important consideration content of the design of a disconnecting link control circuit. The circuit system for preventing the disconnecting link from being switched on and off by mistake in the prior art is complicated to build.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a prevent control circuit of switch mistake deciliter, its control circuit relates to the design simply, and the switch mistake deciliter that leads to when effectively preventing the motor switch malfunction.
In order to achieve the purpose, the utility model provides a control circuit for preventing the disconnecting link from being switched on and off by mistake, which comprises a control circuit and a three-phase motor power circuit; the control loop comprises at least two control branches connected in parallel, each control branch comprises a first normally open contact, a closing coil and a monitoring normally open contact which are sequentially connected in series, and the first normally open contact is connected with a closing button in parallel; the three-phase motor power circuit comprises three-phase motors and voltage monitoring relays, wherein the three-phase motors and the voltage monitoring relays are the same as the control branches in number, the motor switches are used for starting and stopping all the three-phase motors, each three-phase motor is respectively connected with a three-phase alternating current power supply, a second normally open contact of the voltage monitoring relay and the closing coil is connected to a circuit of each three-phase motor connected with the three-phase alternating current power supply, and the voltage monitoring relays are used for controlling the monitoring normally open contact to switch.
In the control circuit for preventing the switch from being switched on and off by mistake, an S L travel switch is further connected to the control branch, and the S L travel switch is connected between the closing coil and the monitoring normally open contact.
The control circuit for preventing the disconnecting link from being switched on and off by mistake is characterized in that a KT overload switch is further connected to the control branch, and the KT overload switch is connected between the switching-on coil and the monitoring normally-open contact.
In the control circuit for preventing the disconnecting link from being switched on and off by mistake, the three-phase alternating-current power supply is 380V alternating current.
In the control circuit for preventing the disconnecting link from being switched on and off by mistake, the power supply of the control circuit is plus or minus 110V direct current.
Compared with the prior art, the utility model, its beneficial effect lies in: the utility model discloses can be in time cut off control circuit and three-phase motor power return circuit when motor switch SA needs the people to break off or jump off because of the fault. Even after the motor switch SA is closed, the three-phase motor can not rotate without the closing of the control loop.
Drawings
Fig. 1 is a circuit diagram of a control circuit for preventing the disconnecting link from being switched on and off by mistake according to the embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example (b):
referring to fig. 1, a control circuit for preventing the disconnecting link from being switched on and off by mistake comprises a control circuit and a three-phase motor power circuit; the control circuit includes three parallel connection's control branch road, be control branch road a respectively, control branch road b, control branch road c, including establishing ties in proper order on the control branch road a and having first normally open contact KM1a, closing coil KM1a and supervision normally open contact TVRa, including establishing ties in proper order on the control branch road b and having first normally open contact KM1b, closing coil KM1b and supervision normally open contact TVRb, including establishing ties in proper order on the control branch road c and having first normally open contact KM1c, closing coil KM1c and supervision normally open contact TVRc. In this embodiment, the first normally open contact KM1b is connected in parallel with a closing button SB1b, and one end of the closing button SB1b is connected to a 110V dc power supply. The other end of the switch is respectively connected with a first normally open contact KM1a, a first normally open contact KM1b and a first normally open contact KM1c which are close to a DC power supply end of-110V, so that each first normally open contact (KM1a, KM1b and KM1c) is connected with a switch-on button SB1b in parallel.
The three-phase motor power circuit comprises three-phase motors and voltage monitoring relays, the three-phase motors and the voltage monitoring relays are the same as the control branches in number, in the embodiment, 3 groups of three-phase motors (Ma, Mb and Mc) are arranged, each three-phase motor is respectively connected with a 380V three-phase alternating-current power supply, a motor switch SA for starting and stopping all the three-phase motors is arranged on a main line of the three-phase alternating-current power supply, the line connecting each three-phase motor and the three-phase alternating-current power supply is connected with the voltage monitoring relays (TVRa, TVRb and TVRc) and second normally-open contacts (KM1a, KM1b and KM1c) of a closing coil, and the voltage monitoring relays are used for controlling the corresponding.
And furthermore, an S L travel switch and a KT overload switch are sequentially connected between the closing coil and the monitoring normally open contact, the S L travel switch is used for disconnecting the S L travel switch and cutting off a separating circuit when the knife switch is closed in place in a closing circuit, and the KT overload switch is used for acting a corresponding relay of the KT overload switch, disconnecting the KT overload switch and cutting off a control circuit when the three-phase motor is overloaded.
In the switching-on process, a motor switch SA on a main line of a three-phase alternating current power supply is switched on, a switching-on button SB1b is pressed, switching-on coils (KM1a, KM1b and KM1c) are electrified, first normally-open contacts (KM1a, KM1b and KM1c) are closed, voltage monitoring relays (TVRa, TVRb and TVRc) of a three-phase motor power circuit are electrified with the three-phase alternating current power supply, the normally-open contacts (TVRa, TVRb and TVRc) are closed, control circuits (a, b and c) are all connected and kept, at the moment, second normally-open contacts (KM1a, KM1b and KM1c) of the three-phase motor power circuit are closed, 3 groups of three-phase motors (Ma, Mb and Mc) rotate, and the control branches (a, b and c) are all kept in a connected state, so that the 3 groups of three-phase motors (Ma, Mb. In the process, the motor switch SA needs to be manually disconnected due to faults or tripped due to faults, at the moment, the voltage monitoring relays (TVRa, TVRb and TVRc) lose magnetism, and then the monitoring normally-open contacts (TVRa, TVRb and TVRc) on the control branches (a, b and c) are disconnected, so that the control branches (a, b and c) are all cut off, and the switching-on coils (KM1a, KM1b and KM1c) lose electricity, so that the first normally-open contacts (KM1a, KM1b and KM1c) and the second normally-open contacts (KM1a, KM1b and KM1c) are all disconnected, and the control loop and the three-phase motor power loop are cut off.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (5)
1. A control circuit for preventing a disconnecting link from being switched on and off by mistake is characterized by comprising a control circuit and a three-phase motor power circuit; the control loop comprises at least two control branches connected in parallel, each control branch comprises a first normally open contact, a closing coil and a monitoring normally open contact which are sequentially connected in series, and the first normally open contact is connected with a closing button in parallel; the three-phase motor power circuit comprises three-phase motors and voltage monitoring relays, wherein the three-phase motors and the voltage monitoring relays are the same as the control branches in number, the motor switches are used for starting and stopping all the three-phase motors, each three-phase motor is respectively connected with a three-phase alternating current power supply, a second normally open contact of the voltage monitoring relay and the closing coil is connected to a circuit of each three-phase motor connected with the three-phase alternating current power supply, and the voltage monitoring relay is used for controlling the monitoring normally open contacts to act.
2. The control circuit for preventing the switch-on and switch-off of the knife switch by mistake as claimed in claim 1, characterized in that an S L travel switch is further connected to the control branch, and the S L travel switch is connected between the closing coil and the monitoring normally open contact.
3. The control circuit for preventing the disconnecting link from being switched on and off by mistake as claimed in claim 1, wherein a KT overload switch is further connected to the control branch, and the KT overload switch is connected between the switching-on coil and the monitoring normally-open contact.
4. The control circuit for preventing the disconnecting link from being switched on and off mistakenly according to claim 1, wherein the three-phase alternating-current power supply is 380V alternating current.
5. The control circuit for preventing the disconnecting link from being switched on and off by mistake according to claim 1, wherein a power supply of the control circuit is direct current of +/-110V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921837998.5U CN211150346U (en) | 2019-10-29 | 2019-10-29 | Control circuit for preventing disconnecting link from being switched on and off by mistake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921837998.5U CN211150346U (en) | 2019-10-29 | 2019-10-29 | Control circuit for preventing disconnecting link from being switched on and off by mistake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211150346U true CN211150346U (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921837998.5U Active CN211150346U (en) | 2019-10-29 | 2019-10-29 | Control circuit for preventing disconnecting link from being switched on and off by mistake |
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| CN (1) | CN211150346U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381507A (en) * | 2021-04-30 | 2021-09-10 | 国网宁夏电力有限公司检修公司 | Isolator control system based on real-time condition diagnosis and multiple anti-misoperation |
-
2019
- 2019-10-29 CN CN201921837998.5U patent/CN211150346U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381507A (en) * | 2021-04-30 | 2021-09-10 | 国网宁夏电力有限公司检修公司 | Isolator control system based on real-time condition diagnosis and multiple anti-misoperation |
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