CN204465392U - A two-drag and multi-redundant motor soft start system - Google Patents

Abstract

The utility model discloses a kind of two and drag many redundance types flexible starter for electric motor system, the normal power supplies network of this system is connected with the first fast acting fuse, the second fast acting fuse respectively through the first circuit breaker, the second circuit breaker, described first fast acting fuse, the second fast acting fuse are connected with the first soft starter, the second soft starter respectively, form softly to open electric power network after the leading-out terminal parallel connection of described first soft starter, the second soft starter; The described soft electric power network that opens connects several motor, each motor and soft open all to be connected with between electric power network softly open contactor, described normal power supplies network is connected to described each motor through bypass contactor and softly opens between contactor; Described first soft starter, the second soft starter, eachly softly open contactor, each bypass contactor is connected with controller respectively.The utility model greatly improves the reliability of production control system and continuous maneuverability, extends the useful life of soft starter simultaneously, improves the maintainability of Soft Starting System.

Description

A two-drag and multi-redundant motor soft start system

technical field

The utility model belongs to the technical field of motor control, in particular to a two-driver-multi-redundancy motor soft start system.

Background technique

The three-phase asynchronous motor will generate a large starting current when it is directly started. According to different loads and motor configurations, the starting current can reach 5 to 9 times the rated operating current. Such a large starting current will seriously impact the power grid, affecting the life of equipment and increasing additional investment in power transmission and distribution. Using a soft starter to start the motor can control and reduce the starting current to avoid the above-mentioned adverse effects.

Now it is common to use one soft starter to start one (commonly known as one-to-one mode) or to start multiple motors in sequence (commonly known as one-to-many mode). This application method is certainly feasible, and has also been applied in many occasions. However, in some industries (such as petroleum, coal, chemical industry, etc.), there are high reliability and continuity requirements for the soft start process. Since any manufacturer's soft starter cannot be 100% reliable, there are some problems in use. Certain hidden dangers. Especially for the soft start system under the one-drag-multi-application mode, the failure caused by this hidden danger will be more serious. In the event of a soft starter failure, multiple motors on the entire production line cannot be started, and in severe cases, the entire production line may not be able to operate normally.

Utility model content

In view of this, the main purpose of the utility model is to provide a two-drag multi-redundant motor soft start system.

In order to achieve the above object, the technical solution of the utility model is achieved in that:

The embodiment of the utility model provides a two-drag multi-redundant motor soft start system, the system includes a first soft starter, a second soft starter, a conventional power supply network, and a controller, and the conventional power supply network passes through the first circuit breaker The circuit breaker QF1 and the second circuit breaker QF2 are respectively connected with the first fast fuse FU1 and the second fast fuse FU2, and the first fast fuse FU1 and the second fast fuse FU2 are connected with the first soft starter and the second fast fuse respectively. The soft starter is connected, and the outlet ends of the first soft starter and the second soft starter are connected in parallel to form a soft start power supply network; the soft start power supply network is connected to several motors, and between each motor and the soft start power supply network All are connected with a soft start contactor KM, and the conventional power supply network is connected between each motor and the soft start contactor KM through a bypass contactor; the first soft starter, the second soft starter, each A soft-start contactor KM and each bypass contactor are connected to the controller respectively.

In the above solution, a thermal relay FR is also connected between each motor and the soft-start contactor KM.

In the above solution, the first soft starter is the master starter, and the second soft starter is the slave starter.

In the above solution, both the first soft starter and the second soft starter are main starters.

Compared with the prior art, the utility model has the beneficial effects:

1. This utility model increases the reliability of the control system. Two soft starters are used to complete the soft start process. The working status of the soft starter is fed back to the controller at any time. Even if one soft starter fails, the second The completion of the work by one soft starter will not affect the execution of the task, and the probability of failure of two soft starters at the same time is very small, so the utility model improves the overall reliability of the soft starter system.

2. This invention prolongs the service life of the soft starter and saves operating costs; the controller controls the alternate cycle start of two soft starters, reducing the loss caused by multiple frequent starts of a single soft starter, thereby The actual service life of each soft starter is increased, and the long-term operating cost is reduced.

3. The maintainability of the soft starter of the present utility model is enhanced; after a soft starter fails, another soft starter in good condition can complete the starting tasks of all motors, and the faulty soft starter can be disassembled and repaired immediately , the utility model not only improves the system failure response capability, but also makes the system failure waiting time zero.

4. The utility model speeds up the starting process and reduces energy loss; in the alternate working mode of the utility model, two soft starters will work alternately, and the starting interval of each two motors will be shortened to half of the one-drag multi-mode time, which not only speeds up the start-up process but also reduces energy consumption.

Description of drawings

Fig. 1 is a connection relationship diagram of a two-drag and multi-redundant motor soft start system provided by an embodiment of the utility model.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The embodiment of the utility model provides a two-drag multi-redundant electric motor soft start system, the system includes a first soft starter, a second soft starter, a conventional power supply network, and a controller. The conventional power supply network refers to the grid power supply The conventional power supply network is connected to the first fast fuse FU1 and the second fast fuse FU2 via the first circuit breaker QF1 and the second circuit breaker QF2 respectively. The first fast fuse FU1 and the second fast fuse FU2 are respectively connected with the first soft starter and the second soft starter, and the outgoing terminals of the first soft starter and the second soft starter are connected in parallel to form a soft starter. Start power supply network, described soft start power supply network refers to as shown in Figure 1, the power supply network that supplies power to all motors after two soft starter outlets are connected in parallel; Described soft start power supply network connects several motors, each motor and A soft start contactor KM is connected between the soft start power supply networks, and the conventional power supply network is connected between each motor and the soft start contactor KM through a bypass contactor; the first soft starter, the second soft starter Two soft starters, each soft start contactor KM, and each bypass contactor are connected to the controller respectively.

Described controller can adopt the small-sized PLC product of brand PLC such as Siemens, Mitsubishi and the single-chip microcomputer of various models.

A thermal relay FR is also connected between each motor and the soft-start contactor KM. The function of the thermal relay FR is to automatically cut off the power supply when the motor is overloaded to protect the motor.

The first soft starter is a master starter, and the second soft starter is a slave starter. In this way, a redundant working state is realized, and two soft starters are used to alternately start multiple motors. One soft starter starts multiple motors, the second soft starter is in backup, and if the first starter fails, the second does all the work.

Both the first soft starter and the second soft starter are main starters, so that an alternate working state is realized, and the two soft starters work alternately to start multiple motors in turn.

Example 1:

The embodiment of the utility model provides a two-drag multi-redundant motor soft start system, as shown in Figure 1, the system includes a first soft starter, a second soft starter, a conventional power supply network, and a controller. The power supply network is respectively connected to the first fast fuse FU1 and the second fast fuse FU2 through the first circuit breaker QF1 and the second circuit breaker QF2, and the first fast fuse FU1 and the second fast fuse FU2 are connected to the first fast fuse FU2 respectively. The L1, L2, and L3 terminals of the soft starter and the second soft starter are connected, and the outgoing terminals T1, T2, and T3 of the first soft starter and the second soft starter are connected in parallel to form a soft start power supply network; The starting power supply network is connected with n motors M1~Mn, and soft starting contactors KM1~KMn are connected between each motor and the soft starting power supply network, and the conventional power supply network is connected to each between each motor and the soft-start contactors KM1-KMn; the first soft-starter, the second soft-starter, each soft-start contactor, and each bypass contactor are respectively connected to the controller.

Thermal relays FR1-FRn are also connected between each motor and the soft-start contactors KM1-KMn.

The function of the soft start contactor and the bypass contactor is to switch the motor between the soft start process and the normal operation state, and the switch is realized by controlling the pull-in and turn-off of the corresponding relay through the output terminal of the controller.

The redundant working process of the present utility model is described as follows:

When starting to work, randomly set one soft starter as the main starter in working state, and the other as the slave starter in backup state; when receiving the first start command, the controller first sets the motor M1 The soft start contactor KM1 is closed, the bypass contactor KM11 is disconnected, and then the controller commands the main soft starter to start working, so that the voltage on the soft start power network gradually rises, and the motor M1 starts gradually; when the soft start power network After the voltage reaches the rated voltage, the motor M1 works normally. At this time, the controller disconnects the soft start contactor KM1 and closes the bypass contactor KM11. The soft start process of the motor M1 is completed, and the controller commands the main start The controller stops working and enters the cooling state; after receiving the second start command, the controller closes the soft-start contactor KM2 of the motor M2 and disconnects the bypass contactor KM12. Then the controller commands the main starter to start working, so that the voltage on the soft-start power supply network gradually rises, and the motor M2 starts gradually. When the voltage of the soft-start power supply network reaches the rated voltage, the motor M2 works normally. At this time, the controller disconnects the soft-start contactor KM2 and closes the bypass contactor KM12. The soft-start process of the motor M2 is completed, and the controller commands the main starter Stop working and enter the heat dissipation state; the subsequent starting process is similar to this until all motors are started.

The whole work of the utility model runs under the monitoring of the controller. Once the main starter fails, the controller will immediately alarm and switch the main starter into a slave starter. The original slave starter is switched to the master starter to complete the remaining The faulty secondary starter is waiting for repair, and it is still set as the secondary starter after repair.

The alternate working process of the utility model is slightly different from the redundant working process, the difference is that: after completing a soft start, the controller must exchange the settings of the master and slave starters once; that is to say, the singular The second start is completed by the first soft starter, and the even number of starts is completed by the second soft starter. The two soft starters alternately supply power to the soft start power network to maintain the normal operation of the system. After any starter fails, the controller will immediately alarm and set the faulty starter as a slave starter and the good starter as a master starter. The status of master and slave will no longer be exchanged. Resume participation in alternate work.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model.

Claims (4)

1. A two-drag multi-redundant motor soft starter system, characterized in that the system includes a first soft starter, a second soft starter, a conventional power supply network, a controller, and the conventional power supply network passes through the first circuit breaker The circuit breaker QF1 and the second circuit breaker QF2 are respectively connected with the first fast fuse FU1 and the second fast fuse FU2, and the first fast fuse FU1 and the second fast fuse FU2 are connected with the first soft starter and the second fast fuse respectively. The soft starter is connected, and the outlet ends of the first soft starter and the second soft starter are connected in parallel to form a soft start power supply network; the soft start power supply network is connected to several motors, and between each motor and the soft start power supply network All are connected with a soft start contactor KM, and the conventional power supply network is connected between each motor and the soft start contactor KM through a bypass contactor; the first soft starter, the second soft starter, each A soft-start contactor KM and each bypass contactor are connected to the controller respectively. 2. The soft start system of two motors with multiple redundant motors according to claim 1, characterized in that: a thermal relay FR is also connected between each motor and the soft start contactor KM. 3. The two-drag multi-redundant motor soft starter system according to claim 1 or 2, wherein the first soft starter is a master starter, and the second soft starter is a slave starter. 4. The two-drag multi-redundant motor soft starter system according to claim 1 or 2, characterized in that: the first soft starter and the second soft starter are both main starters.