CN204271513U - An on-load capacity regulating substation capable of intelligent control - Google Patents

Abstract

The utility model discloses a can realize intelligent control's on-load transfer holds transformer substation, the transformer substation includes high tension switchgear group, on-load transfer holds transformer body, low pressure parallel connection cabinet and low-voltage combination cabinet, and its special character lies in: the on-load capacity and voltage regulating transformer body comprises a common transformer and a standby transformer; an intelligent on-load capacity regulating controller is arranged in the low-voltage parallel cabinet and comprises a current acquisition unit, a data comparison unit, a state monitoring unit and a control unit; the current acquisition unit transmits the low-voltage side load current data to the data comparison unit, the data comparison unit transmits the comparison result to the control unit, the state monitoring unit monitors and transmits the running state information of the standby transformer to the control unit, and the control unit controls the standby transformer to be put into or quit the running mode according to the comparison result and the running state information, so that the automatic switching of the transformer substation between two different rated capacities is realized.

Description

An on-load capacity regulating substation capable of intelligent control

technical field

The utility model relates to the technical field of electric power system substations, in particular to an on-load capacity regulating substation capable of realizing intelligent control.

Background technique

As we all know, a transformer is an electrical device that realizes high and low voltage conversion. When using electricity, the voltage is reduced by using a distribution transformer and then supplied to users. In the traditional distribution network, the substation faces a large number of users, and the installation locations are messy and scattered. At the same time, traditional substations cannot be used flexibly in places with strong seasonality of electricity consumption, large load fluctuations, concentrated electricity consumption, and low annual average load rate. Especially in rural areas of our country, the electricity load has obvious seasonality. In summer and autumn, the rest of the seasons are mainly used for lighting. In the busy farming season, transformers are seriously overloaded. In the off-season, the load rate is low, and the phenomenon of "big horses and small carts" appears. Such unreasonable power distribution operation mode not only restricts the development of distribution network, but also causes huge economic losses.

As a distribution substation with two types of rated capacity, the intelligent on-load capacity regulating substation can be automatically detected and judged by the intelligent on-load controller according to the size of the load carried by the user, and the control command is issued through the on-load capacity regulating switch. When the transformer is not powered off, the two capacities of the transformer are automatically switched to realize the automatic conversion of the two rated capacity operation modes of the transformer.

The method of adjusting the capacity of the transformer in the on-load capacity-regulating substation in the prior art is to control the wiring mode of the transformer winding or to switch the working state of at least two on-load capacity-regulating transformers that can be operated in parallel. There are fixed common transformers in the specified on-load adjustable capacity transformer, and the rest of the transformers are used as backup transformers. Whether the backup transformer enters the running state can be controlled by the intelligent on-load capacity adjustment controller according to the actual load.

Utility model content

The technical problem to be solved by the utility model is to provide an on-load capacity regulating substation that can realize intelligent control, which not only realizes the automatic adjustment of the two sizes of the rated capacity of the intelligent on-load capacity regulating substation under the condition that the substation is not powered off , and achieved the purpose of saving energy and reducing consumption.

In order to solve the above technical problems, an on-load capacity-regulating substation capable of intelligent control is provided. The substation includes a high-voltage switchgear group, an on-load capacity-regulating transformer body, a low-voltage parallel cabinet and a low-voltage combination cabinet; the high-voltage switchgear group will The high voltage is sent to the on-load capacity-regulating transformer body, and the on-load capacity-regulating transformer body converts the high voltage into a low voltage and then is transported to the low-voltage combination cabinet through the low-voltage parallel cabinet; the on-load capacity-regulating transformer body includes at least two A transformer and an on-load capacity regulating switch operating in parallel, the two parallel-operating transformers include a common transformer and a backup transformer, and the on-load capacity regulating switch includes a high-voltage side capacity-regulating switch and a low-voltage side capacity-regulating switch, so The high-voltage side capacity regulating switch is connected to the high-voltage side of the standby transformer, the low-voltage side capacity regulating switch is connected to the low-voltage side of the standby transformer, and an intelligent on-load capacity regulating controller is provided in the low-voltage parallel cabinet; wherein, the intelligent The on-load capacity regulation controller includes a current acquisition unit, a data comparison unit, a state monitoring unit and a control unit; the current acquisition unit, the data comparison unit, and the state monitoring unit are respectively connected to the control unit; The switch and the low-voltage side capacity adjustment switch are respectively electrically connected to the control unit, and the current acquisition unit collects the low-voltage side load current data; the data comparison unit transmits the comparison result of the real-time low-voltage side load current data and the set data limit to the control unit; the state monitoring unit monitors and sends the operating state information of the standby transformer to the control unit; the control unit sends a control instruction to the on-load capacity regulating switch according to the comparison result and the operating state information to control the standby transformer Put into or quit the parallel operation mode with the common transformer, and then realize the automatic switching between two different rated capacities of the substation.

In the utility model, the high-voltage switch cabinet group includes a high-voltage incoming line cabinet, a common transformer high-voltage outgoing line cabinet, and a spare transformer high-voltage outgoing line cabinet; the high voltage of the power grid enters the common transformer high-voltage outgoing line cabinet and the spare transformer high-voltage outgoing line cabinet through the high-voltage incoming line cabinet. .

In the utility model, the high voltage output from the high-voltage outlet cabinet of the normal transformer enters the high-voltage side of the normal transformer, and the high voltage output from the high-voltage outlet cabinet of the backup transformer enters the high-voltage side of the backup transformer through the high-voltage side capacity regulating switch.

In the utility model, the low-voltage combined cabinet includes a low-voltage incoming cabinet, a low-voltage outgoing cabinet and a low-voltage capacitor compensation cabinet. the

In the utility model, current transformers are arranged in the low-voltage incoming cabinet, the low-voltage outgoing cabinet and the low-voltage capacitor compensation cabinet.

In the present invention, the current transformer is connected with the current acquisition unit.

In the utility model, the intelligent on-load capacity regulation controller adopts an embedded design.

In the utility model, the low-voltage parallel cabinet is also provided with a display connected to the intelligent on-load capacity regulation controller.

Since the on-load capacity regulating substation body of the present invention includes at least two transformers that can operate in parallel, one must be set as a common transformer, and the rest as standby transformers. The operating state of the standby transformer is controlled by the on-load intelligent controller according to the actual load demand and sends a control command to the on-load capacity regulating switch to control its input or exit from the parallel operation mode with the common transformer. In this way, it is ensured that the substation is not powered off and the switch between the two capacity operation modes is automatically realized under load, and because when the substation is converted from a large capacity to a small capacity, due to exiting the operation of the backup transformer, no-load Loss and no-load current are also greatly reduced, thereby greatly reducing the no-load reactive power loss and active power loss of the transformer, and achieving the purpose of energy saving and consumption reduction.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Fig. 2 is a control function block diagram of an embodiment of the present invention.

Fig. 3 is a circuit wiring diagram of the primary system in an embodiment of the present invention.

Reference signs: 1. High-voltage switchgear group, 2. On-load capacity-adjusting transformer body, 201. Commonly used transformer, 202. Standby transformer, 3. Low-voltage parallel cabinet, 4. Low-voltage combination cabinet, 5. On-load capacity-adjusting switch, 6. Intelligent on-load capacity regulation controller.

Detailed ways

As shown in the figure, the utility model is an on-load capacity-regulating substation capable of intelligent control. The substation includes a high-voltage switchgear group 1, an on-load capacity-regulating transformer body 2, a low-voltage parallel cabinet 3 and a low-voltage combined cabinet 4; The high-voltage switchgear group 1 transmits the high voltage to the on-load capacity-adjusting transformer body 2, and the on-load capacity-adjusting transformer body 2 converts the high voltage into a low voltage and then transmits it to the low-voltage combined cabinet 4 through the low-voltage parallel cabinet 3; The on-load capacity-regulating transformer body 2 includes at least two parallel-operable transformers and an on-load capacity-regulating switch 5. The two parallel-operable transformers include a common transformer 201 and a backup transformer 202. The on-load capacity-adjusting The switch 5 includes a high voltage side capacity regulating switch and a low voltage side capacity regulating switch, the high voltage side capacity regulating switch is connected to the high voltage side of the standby transformer, the low voltage side capacity regulating switch is connected to the low voltage side of the standby transformer, and the low voltage parallel cabinet 3 is provided with an intelligent on-load capacity regulation controller 6; wherein, the intelligent on-load capacity regulation controller 6 includes a current acquisition unit, a data comparison unit, a state monitoring unit and a control unit; the current acquisition unit, the data comparison unit 1. The state monitoring unit is respectively connected to the control unit; the high-voltage side capacity adjustment switch and the low-voltage side capacity adjustment switch are respectively electrically connected to the control unit, and the current acquisition unit collects low-voltage side load current data; the data The comparison unit transmits the comparison result of the real-time low-voltage side load current data and the set data limit value to the control unit; the state monitoring unit monitors and sends the operation status information of the backup transformer 202 to the control unit; the control unit according to the comparison The results and the operation state information send control instructions to the on-load capacity regulation switch 5, and control the standby transformer 202 to enter or exit the parallel operation mode with the common transformer 201, thereby realizing the automatic switching between two different rated capacities of the substation. .

The high-voltage switchgear group 1 includes high-voltage incoming cabinets, high-voltage outgoing cabinets for common transformers, and high-voltage outgoing cabinets for spare transformers; the high voltage of the power grid enters the high-voltage outgoing cabinets for common transformers and the high-voltage outgoing cabinets for standby transformers through the high-voltage incoming cabinets.

The high voltage output from the high voltage outlet cabinet of the normal transformer enters the high voltage side of the normal transformer, and the high voltage output from the high voltage outlet cabinet of the backup transformer enters the high voltage side of the backup transformer through the capacity regulating switch on the high voltage side.

The low-voltage combination cabinet 4 includes a low-voltage incoming cabinet, a low-voltage outgoing cabinet and a low-voltage capacitor compensation cabinet.

The low-voltage incoming line cabinet, the low-voltage outgoing line cabinet and the low-voltage capacitor compensation cabinet are provided with current transformers.

The current transformer is connected with the current acquisition unit.

The intelligent on-load capacity regulation controller 6 adopts an embedded design.

The low-voltage parallel cabinet is also provided with a display connected to the intelligent on-load capacity regulation controller 6 .

In practical application, as shown in the primary system circuit wiring diagram of Figure 3, a current transformer for detecting current, a low-voltage incoming line isolating switch, a low-voltage incoming line circuit breaker, a voltmeter, and an ammeter are installed in the low-voltage incoming line cabinet. , a measuring and controlling instrument and a changeover switch for measuring temperature; a low-voltage outlet short-circuit device, a current transformer and an ammeter for detecting current are installed in the low-voltage outlet cabinet; an isolating switch and a capacitor are installed in the low-voltage capacitor compensation cabinet, There are also current transformers, ammeters, small circuit breakers, controllers, and contactors for detecting current.

The working principle of the utility model is that the actual load data detected by the current transformer is sent to the intelligent on-load capacity regulation controller 6. In this controller, the actual load data is collected by the current acquisition unit, and the actual load data is collected by the data comparison unit. The load data is compared with the set load limit, and the comparison result is sent to the control unit. When the actual load is greater than the upper limit load, the control unit closes the switch, and the high-voltage side capacity adjustment switch is closed first, and then the low-voltage side capacity adjustment switch is closed again. , the standby transformer 202 is put into operation and enters the parallel operation mode; when the actual load is less than the upper limit load, the control unit issues an opening command, the low-voltage side capacity adjustment switch is disconnected first, and then the high-voltage side capacity adjustment switch is disconnected to enter parallel connection The standby transformer 202 in the run mode exits the run state.

The specific embodiments of the present utility model have been described above. It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the utility model.

Claims (8)

1. An on-load capacity-regulating substation capable of intelligent control, the substation includes a high-voltage switchgear group (1), an on-load capacity-regulating transformer body (2), a low-voltage parallel cabinet (3) and a low-voltage combined cabinet (4) ; The high-voltage switchgear group (1) transmits high voltage to the on-load capacity-adjusting transformer body (2), and the on-load capacity-adjusting transformer body (2) changes the high voltage to low voltage through the low-voltage parallel cabinet (3 ) to the low-voltage combination cabinet (4); it is characterized in that: the on-load capacity-adjusting transformer body (2) includes at least two parallel-operable transformers and on-load capacity-adjusting switches (5), and the two parallel The operating transformer includes a normal transformer (201) and a backup transformer (202), the on-load capacity regulation switch (5) includes a high-voltage side capacity regulation switch and a low-voltage side capacity regulation switch, and the high-voltage side capacity regulation switch is connected to The high-voltage side of the standby transformer, the low-voltage side capacity adjustment switch is connected to the low-voltage side of the standby transformer, and the low-voltage parallel cabinet (3) is equipped with an intelligent on-load capacity adjustment controller (6); wherein, the intelligent on-load The capacity regulating controller (6) includes a current acquisition unit, a data comparison unit, a state monitoring unit, and a control unit; the current acquisition unit, the data comparison unit, and the state monitoring unit are respectively connected to the control unit; The capacitance switch and the low-voltage side capacity adjustment switch are respectively electrically connected to the control unit, and the current acquisition unit collects the low-voltage side load current data; the data comparison unit compares the real-time low-voltage side load current data with the set data limit transmitted to the control unit; the state monitoring unit monitors and sends the operating state information of the backup transformer (202) to the control unit; the control unit sends the on-load capacity regulating switch (5) A control command is sent to control the standby transformer (202) to enter or exit the parallel operation mode with the normal transformer (201), thereby realizing automatic switching between two different rated capacities of the substation. 2. The on-load capacity regulating substation capable of intelligent control according to claim 1, characterized in that, the high-voltage switchgear group (1) includes a high-voltage incoming line cabinet, a common transformer high-voltage outgoing line cabinet, and a spare transformer high-voltage Outlet cabinet: The high voltage of the power grid enters the high-voltage outlet cabinet of the common transformer and the high-voltage outlet cabinet of the spare transformer respectively through the high-voltage inlet cabinet. 3. A kind of on-load capacity regulating substation capable of intelligent control according to claim 2, characterized in that, the high voltage output from the high-voltage outlet cabinet of the common transformer enters the high-voltage side of the common transformer, and the high voltage from the standby transformer The high voltage output by the outlet cabinet enters the high voltage side of the standby transformer through the capacity regulating switch on the high voltage side. 4. The on-load capacity regulating substation capable of intelligent control according to claim 1, wherein the low-voltage combination cabinet (4) includes a low-voltage incoming cabinet, a low-voltage outgoing cabinet, and a low-voltage capacitor compensation cabinet. 5. An on-load capacity regulating substation capable of intelligent control according to claim 4, characterized in that, the low-voltage incoming cabinet, the low-voltage outgoing cabinet and the low-voltage capacitor compensation cabinet are provided with current mutual inductance device. 6 . The on-load capacity regulating substation capable of intelligent control according to claim 5 , wherein the current transformer is connected to the current acquisition unit. 7 . 7. The on-load capacity regulating substation capable of intelligent control according to claim 1, characterized in that the intelligent on-load capacity regulating controller (6) adopts an embedded design. 8. An on-load capacity regulating substation capable of intelligent control according to claim 1, characterized in that the low-voltage parallel cabinet (3) is also equipped with an intelligent on-load capacity regulating controller (6) monitor.