CN205141695U - Uninterrupted power supply distribution transformer three -phase unbalanced load regulator - Google Patents

Abstract

The utility model mainly provides a three-phase load unbalance regulator for an uninterrupted power supply distribution transformer, which mainly includes a molded case circuit breaker, an AC contactor, a switch full-control thyristor, a power adapter, a PLC controller, and a residual current protector. Intelligent monitoring system, the molded case circuit breaker is connected in the three-phase circuit, the molded case circuit breaker is connected in series with the AC contactor, the AC contactor is connected in parallel with the switch full-control thyristor in the circuit, and the power adapter is connected in the three-phase circuit as The PLC controller provides the power supply, and the PLC controller is also respectively connected with the switch full-control thyristor and the intelligent monitoring system of the residual current protector. It can be shortened to a few milliseconds without interrupting the electricity consumption of residents.

Description

A three-phase load unbalance regulator for uninterrupted power supply distribution transformer

Technical field:

The utility model relates to the field of distribution transformers, in particular to a three-phase load unbalance regulator for uninterrupted power supply distribution transformers.

Background technique:

At present, the three-phase load unbalance regulator of the distribution transformer is composed of three independent single-phase circuit breakers. Phase load unbalanced adjustment, but short-term interruption of residential power consumption, power supply reliability rate is reduced.

Utility model content:

In order to solve the above problems, the utility model provides a simple working principle, which can not only quickly switch the three-phase load of the distribution transformer, shorten from the original few seconds to a few milliseconds, but also can not interrupt the technical solution of residents' electricity consumption:

A three-phase load unbalance regulator for an uninterrupted power supply distribution transformer, mainly including a molded case circuit breaker, an AC contactor, a switch full-control thyristor, a power adapter, a PLC controller, an intelligent monitoring system for a residual current protector, and a molded case The circuit breaker includes a first molded case circuit breaker, a second molded case circuit breaker, and a third molded case circuit breaker. The first molded case circuit breaker, the second molded case circuit breaker, and the third molded case circuit breaker are respectively connected to the three-phase circuit Among them, the power adapter is connected to the three-phase circuit to provide power for the PLC controller, and the PLC controller is also connected to the intelligent monitoring system of the residual current protector.

Preferably, the AC contactor includes a first AC contactor, a second AC contactor, and a third AC contactor, and the first AC contactor, the second AC contactor, and the third AC contactor are respectively connected to the first molded case circuit breaker , The second molded case circuit breaker and the third molded case circuit breaker are connected in series.

Preferably, the switch full-control thyristor includes a first switch full-control thyristor, a second switch full-control thyristor, a third switch full-control thyristor, a first switch full-control thyristor, a second switch full-control thyristor, a second switch full-control thyristor, and a second switch full-control thyristor. The three-switch fully-controlled thyristors are respectively connected in parallel with the first AC contactor, the second AC contactor, and the third AC contactor in the circuit. The first switch full-control thyristor, the second switch full-control thyristor, and the third switch The common input terminal of the fully-controlled thyristor is connected to the PLC controller, and the common output terminal is connected to the 220V power supply terminal.

Preferably, the residual current protector intelligent monitoring system includes a residual current transformer, a power transformer, a residual current monitor, a wireless communication device, and an alarm protection device. The residual current transformer is connected to the ground wire of the transformer outlet terminal, and the power transformer is connected to the transformer outlet. The terminal fire wire and the residual current monitor are respectively connected to the residual current transformer, power transformer, wireless communication device, and alarm protection device. The wireless communication device is connected to the service platform through the GPRS network.

The beneficial effects of the utility model are:

(1) The AC contactor of the utility model and the fully-controlled thyristor are used in conjunction with specific logic, which can quickly switch the three-phase load of the distribution transformer, shortening the original few seconds to several milliseconds, and the load commutation time is faster 1000 times, realizing the uninterrupted power supply during the phase change process of the residential power load, reducing the unbalanced three-phase load of the distribution transformer, improving the qualified rate of voltage in the station area, reducing the line loss in the station area, and avoiding the distribution transformer due to single The burnout caused by the overload of phase load improves the reliability of power supply.

(2) The residual current protector intelligent monitoring system adopted by the utility model can accurately collect load current, improve data accuracy, and effectively ensure safe operation.

Description of drawings:

Fig. 1 is a system schematic diagram of the present utility model;,

Fig. 2 is a schematic diagram of the intelligent monitoring system of the residual current protector of the present invention.

detailed description:

In order to make the purpose, technical solution and advantages of the utility model clearer, the implementation of the utility model will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a three-phase load unbalance regulator for an uninterrupted power supply distribution transformer mainly includes a molded case circuit breaker, an AC contactor, a switch full-control thyristor, a power adapter 1, a PLC controller 2, a residual current The protector intelligent monitoring system 3, the molded case circuit breaker includes the first molded case circuit breaker 4, the second molded case circuit breaker 5, the third molded case circuit breaker 6, the first molded case circuit breaker 4, and the second molded case circuit breaker 5. The third molded case circuit breaker 6 is respectively connected to the three-phase circuit, and the AC contactor includes the first AC contactor 7, the second AC contactor 8, the third AC contactor 9, the first AC contactor 7, the second AC contactor The second AC contactor 8 and the third AC contactor 9 are respectively connected in series with the first molded case circuit breaker 4 , the second molded case circuit breaker 5 and the third molded case circuit breaker 6 . The control thyristor 10, the second switch full control thyristor 11, the third switch full control thyristor 12, the first switch full control thyristor 10, the second switch full control thyristor 11, and the third switch full control thyristor 12 respectively Connected in parallel with the first AC contactor 7, the second AC contactor 8, and the third AC contactor 9, the first switch full-control thyristor 10, the second switch full-control thyristor 11, and the third switch full-control thyristor Type thyristor 12 common input terminal is connected to PLC controller 2, common output terminal is connected to 220V power supply terminal, power adapter 1 is connected to the three-phase circuit to provide power for PLC controller 2, and PLC controller 2 is also connected to residual current protector intelligent monitoring system 3.

As shown in Figure 2, the residual current protector intelligent monitoring system 3 includes a residual current transformer 31, a power transformer 32, a residual current monitor 33, a wireless communication device 34, and an alarm protection device 35, and the residual current transformer 31 is connected to the transformer outlet The terminal ground wire, the power transformer 32 is connected to the live wire of the transformer outlet terminal, and the residual current monitor 33 is respectively connected to the residual current transformer 31, the power transformer 32, the wireless communication device 34, and the alarm protection device 35, and the wireless communication device 34 is connected through the GPRS network After the service platform 36, the residual current monitor 33 collects and processes the data, the data is uploaded to the service platform 36 by the wireless communication device 34 through the GPRS wireless network, so that the personnel on duty can monitor in real time and grasp the operation situation of the power grid at any time. It can be processed in time, and the intelligent monitoring system of the residual current protector adopted by the utility model can accurately collect the load current, improve the data accuracy, and effectively ensure the safe operation.

Working principle: The AC contactor of the utility model can be put into operation for a long time, and the switch full-control thyristor can only be put into operation for a short time. The first AC contactor 7, the second AC contactor 8, and the third AC contactor 9 can only One can be put in, the first switch full-control thyristor 10, the second switch full-control thyristor 11, and the third switch full-control thyristor 12 can only be put in one at a time, and the AC contactors and full-control thyristors paralleled in the same phase can be paralleled operation, and can also be split. The A-phase switch is composed of the first AC contactor 7 and the first switch full-control thyristor 10 in parallel. The B-phase switch is composed of the second AC contactor 8 and the second switch full-control thyristor 11 in parallel. , The C-phase switch is composed of the third AC contactor 9 and the third switch fully-controlled thyristor 12 in parallel. If the A-phase load is the largest, the B-phase load is the second, and the C-phase load is the smallest, the 220V residential single-phase load is connected to the 380V distribution network. On phase A of the trunk line, that is, the first AC contactor 7 is in the on state, the second AC contactor 8, the third AC contactor 9, the first switch full-control thyristor 10, the second switch full-control thyristor 11, The third switch fully-controlled thyristor 12 is in the off state, and now it is necessary to switch the residential end load to phase C. The action logic sequence is as follows: close the first switch fully-controlled thyristor 10 of phase A, and disconnect the first AC of phase A Contactor 7, disconnect the full-control thyristor 10 of the first switch of phase A, close the full-control thyristor 12 of the third switch of phase C, close the third AC contactor 9 of phase C, turn off the full control of the third switch of phase C Type thyristor 12, 220V residential single-phase load is switched from phase A to phase C of the 380V distribution network main line within 10ms; on the contrary, when the load of phase C is the largest, the load of phase B is the second, the load of phase A is the smallest, and the single-phase load of 220V residents is connected On phase C of the main line of the 380V distribution network, that is, the third AC contactor 9 is in the on state, the first AC contactor 7, the second AC contactor 8 and the first switch full-control thyristor 10, the second switch full-control type thyristor 11 and the third switch full-control thyristor 12 are in the off state, and now it is necessary to switch the residential end load to phase A, the action logic sequence is as follows: close the third switch full-control thyristor 12 of phase C, and disconnect The third AC contactor 9, disconnect the third switch full-control thyristor 12 of phase C, close the first switch full-control thyristor 10 of phase A, close the first AC contactor 7 of phase A, and disconnect the first switch of phase A Switch full-control thyristor 10, 220V residential single-phase load is switched from phase C to phase A of the main line of the 380V distribution network within 10ms, and the partial load current of phase C of the main line of the 380V distribution network is transferred to phase A, and the distribution transformer is three-phase The load imbalance is further reduced.

The AC contactor of the utility model and the full-control thyristor are used in conjunction with specific logic, which can quickly switch the three-phase load of the distribution transformer, which is shortened from the original few seconds to several milliseconds, and the load commutation time is 1000 times faster. It realizes the uninterrupted power supply during the phase change process of the electric load at the residential end, reduces the unbalanced three-phase load of the distribution transformer, improves the qualified rate of voltage in the station area, reduces the line loss in the station area, and avoids the single-phase load overload of the distribution transformer. The burnout caused by heavy weight improves the reliability of power supply.

The above-described embodiments are only preferred embodiments of the present utility model, and are not limitations to the technical solutions of the present utility model. As long as the technical solutions that can be realized on the basis of the above-mentioned embodiments without creative work, all should be regarded as falling into the scope of this invention. within the protection scope of utility model patents.

Claims (4)

1. A three-phase load unbalance regulator for an uninterrupted power supply distribution transformer, characterized in that it mainly includes a molded case circuit breaker, an AC contactor, a switch full-control thyristor, a power adapter, a PLC controller, and a residual current protector Intelligent monitoring system, the molded case circuit breaker includes a first molded case circuit breaker, a second molded case circuit breaker, a third molded case circuit breaker, the first molded case circuit breaker, the second molded case circuit breaker, The third molded case circuit breaker is respectively connected to the three-phase circuit, the power adapter is connected to the three-phase circuit to provide power for the PLC controller, and the PLC controller is also connected to the residual current protector for intelligent monitoring system. 2. A three-phase load unbalance regulator for an uninterruptible power supply distribution transformer according to claim 1, wherein the AC contactor includes a first AC contactor, a second AC contactor, a third AC contactor contactor, the first AC contactor, the second AC contactor, and the third AC contactor are respectively connected to the first molded case circuit breaker, the second molded case circuit breaker, and the third Molded case circuit breakers are connected in series. 3. A three-phase load unbalance regulator for uninterrupted power supply distribution transformers according to claim 2, characterized in that: the switch full-control thyristor comprises a first switch full-control thyristor, a second switch full-control thyristor type thyristor, the third switch full-control thyristor, the first switch full-control thyristor, the second switch full-control thyristor, the third switch full-control thyristor are respectively connected with the first AC contactor, The second AC contactor and the third AC contactor are connected in parallel in the circuit, the first switch full-control thyristor, the second switch full-control thyristor, and the third switch full-control thyristor The common input terminal is connected to the PLC controller, and the common output terminal is connected to the 220V power supply terminal. 4. A three-phase load unbalance regulator for uninterrupted power supply distribution transformer according to claim 1, characterized in that: said residual current protector intelligent monitoring system includes residual current transformer, power transformer, residual current A monitor, a wireless communication device, and an alarm protection device, the residual current transformer is connected to the ground wire of the transformer outlet terminal, the power transformer is connected to the live wire of the transformer outlet terminal, and the residual current monitor is respectively connected to the residual current transformer, The power transformer, the wireless communication device, the alarm protection device, and the wireless communication device are connected to a service platform through a GPRS network.