CN204271512U - An intelligent on-load capacity regulating substation - Google Patents

Abstract

The utility model discloses a kind of intelligent loaded capacity-regulated transformer station.This transformer station comprises load capacitance-adjustable transformer body group, high-voltage switch gear group, low pressure parallel-connection cabinet and low pressure combination sideboard; Its special character is: described loaded capacity-regulated transformer body group comprises spare transformer low pressure inlet wire control cubicle and at least two can the transformer of parallel running, described two the transformer of parallel running can comprise a typical transformer and a spare transformer, typical transformer and spare transformer respectively with the two-way connection that is in parallel in high-voltage switch gear group, described spare transformer low pressure inlet wire control cubicle is connected between spare transformer and low pressure parallel-connection cabinet, and carries out switching action according to the size of actual load demand to spare transformer.So just ensure that transformer station does not have a power failure and automatically realize the switching of two kinds of rated capacity operational modes, again due to when transformer station is converted to low capacity by Large Copacity, owing to having exited the operation of a transformer, reach energy-saving and cost-reducing object.

Description

An intelligent on-load capacity regulating substation

technical field

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

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-adjusting substation can be automatically detected and judged by the intelligent controller according to the size of the load carried by the user, and the control command can be issued through the on-load capacity-adjusting switch. In the state of power failure, the two kinds of capacity of the substation are automatically switched, and the automatic conversion of the two rated capacity operation modes of the substation is realized.

The method of adjusting the capacity of the transformer in the on-load capacity-adjusting 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-adjusting transformers that can be operated in parallel. Among the designated on-load adjustable capacity transformers, there are fixed common transformers, and the rest of the transformers are used as backup transformers. Whether the backup transformers enter the running state can be controlled according to the actual load demand.

Utility model content

The technical problem to be solved by the utility model is to provide an intelligent on-load capacity regulating substation, which not only realizes the adjustment of two types of rated capacity of the on-load substation when the substation is not powered off, but also achieves the purpose of saving energy and reducing consumption.

In order to solve the above technical problems, the utility model provides an intelligent on-load capacity regulating substation. The substation includes an on-load capacity regulating transformer body group, a high-voltage switch cabinet group, a low-voltage parallel cabinet and a low-voltage combination cabinet; the high-voltage switch cabinet group transmits high voltage to the on-load capacity regulating transformer body group, and the on-load capacity regulating transformer body group The transformer body group changes the high voltage into a low voltage and then transmits it to the low-voltage combination cabinet through the low-voltage parallel cabinet; wherein, the on-load capacity regulating transformer body group includes a spare transformer low-voltage incoming line control cabinet and at least two transformers that can operate in parallel, The two transformers that can operate in parallel include a normal transformer and a backup transformer, the normal transformer and the backup transformer are respectively connected to the two parallel lines in the high-voltage switchgear group, and the backup transformer is connected to the low-voltage incoming line control cabinet. Between the backup transformer and the low-voltage parallel cabinet, the backup transformer is switched according to the size of the actual load demand.

In the utility model, the two transformers that can operate in parallel have the same type, the same transformation ratio, the same impedance voltage and the same wiring group. The wiring groups of the transformers are all delta-star connections.

In the utility model, the high-voltage switchgear group includes a high-voltage incoming line cabinet, a high-voltage outgoing line cabinet group, and a spare transformer high-voltage incoming line control cabinet; the high-voltage outgoing line cabinet group includes a common transformer high-voltage outgoing line The standby transformer high-voltage incoming line control cabinet is connected to the standby transformer high-voltage outgoing line cabinet of the standby transformer.

In the utility model, a high-voltage vacuum circuit breaker is installed in the standby transformer high-voltage incoming line control cabinet.

In the utility model, a low-voltage vacuum circuit breaker is installed in the standby transformer low-voltage incoming line control cabinet.

In the utility model, the low-voltage parallel cabinet is equipped with an intelligent controller and an ammeter that issue closing or opening commands to control the operating state of the standby transformer.

In the utility model, the low-voltage combination cabinet includes a low-voltage incoming line cabinet, a low-voltage outgoing line cabinet, a low-voltage capacitor compensation cabinet and a low-voltage main busbar; a low-voltage incoming line isolating switch, a low-voltage incoming line circuit breaker, A current transformer, a voltmeter, an ammeter, a measuring and controlling instrument for measuring temperature, and a changeover switch for detecting current; a low-voltage outlet circuit breaker, a current transformer for detecting current, and an ammeter are installed in the low-voltage outlet cabinet; The above-mentioned low-voltage capacitor compensation cabinet is equipped with isolating switches, capacitors, current transformers, ammeters, small circuit breakers, controllers, and contactors for detecting current.

Since the on-load capacity regulating substation body group 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 intelligent controller according to the actual load demand, and the high-voltage incoming cabinet of the standby transformer and the low-voltage incoming cabinet of the standby transformer are controlled by the intelligent controller to enter or exit the parallel operation mode with the common transformer. In this way, it is guaranteed that the substation will not be powered off and the switching between the two capacity operation modes will be automatically realized under the condition of load, and because when the substation is converted from a large capacity to a small capacity, due to the withdrawal of a transformer, no-load loss and no-load loss The load current is also greatly reduced, thereby greatly reducing the no-load reactive power loss and active power loss of the transformer, and achieving the purpose of saving energy and reducing consumption.

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 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 regulating transformer body group, 201. Common transformer, 202. Backup transformer, 203. Backup transformer low-voltage incoming line control cabinet, 3. Low-voltage parallel cabinet, 4. Low-voltage Combination cabinet, 5. High-voltage incoming line cabinet, 6. Commonly used transformer high-voltage outgoing line cabinet, 7. Spare transformer high-voltage outgoing line cabinet, 8. Spare transformer high-voltage incoming line control cabinet, 401. Low-voltage incoming line cabinet, 4011. Current transformer, 4012 Low-voltage incoming line isolating switch, 4013, low-voltage incoming line circuit breaker, 4014, voltmeter, 402, low-voltage outgoing line cabinet, 4021, low-voltage outgoing line circuit breaker, 403, low-voltage capacitor compensation cabinet, 4031, isolating switch, 4032, capacitor, 404, Low voltage main bus.

Detailed ways

As shown in the figure of the utility model, an intelligent on-load capacity-regulating substation includes a high-voltage switchgear group 1, an on-load capacity-regulating transformer body group 2, a low-voltage parallel cabinet 3, a low-voltage combined cabinet 4 and a manhole. The high-voltage switchgear group 1 transmits the high voltage to the on-load capacity-adjusting transformer body group 2, and the on-load capacity-adjusting transformer body group 2 converts the high voltage into a low voltage and then transmits it to the low-voltage combination cabinet 4 through the low-voltage parallel cabinet 3 ; Wherein, the on-load capacity regulating transformer body group 2 includes a spare transformer low-voltage incoming line control cabinet 203 and at least two transformers that can operate in parallel, and the two transformers that can operate in parallel include a common transformer 201 and a The standby transformer 202, the common transformer 201 and the standby transformer 202 are respectively connected to the two parallel lines in the high-voltage switchgear group 1, and the low-voltage incoming line control cabinet 203 of the standby transformer is connected between the standby transformer 202 and the low-voltage parallel cabinet 3, And the backup transformer 202 is switched on and off according to the size of the actual load demand.

The high-voltage switchgear group 1 includes a high-voltage incoming line cabinet 5, a common transformer high-voltage outgoing line cabinet 6 connected to a common transformer 201, a spare transformer high-voltage incoming line control cabinet 8 connected to a spare transformer 202, and a high-voltage incoming line control cabinet 8 connected to a spare transformer. Standby transformer high-voltage outlet cabinet 7.

In this embodiment, the normal transformer 201 and the backup transformer 202 have the same model, the same transformation ratio, the same impedance voltage and the same wiring group. The models of the normal transformer 201 and the standby transformer 202 are S11-400, and the wiring groups are both delta-star connections. Here, the common transformer 201 is represented by transformer 1# in FIG. 1 , and the standby transformer 202 is represented by transformer 2# in FIG. 1 .

A high-voltage vacuum circuit breaker is housed in the standby transformer high-voltage incoming line control cabinet 8 .

The standby transformer low-voltage incoming line control cabinet 203 is equipped with a low-voltage vacuum circuit breaker.

The low-voltage parallel cabinet 3 is equipped with an intelligent controller and an ammeter that issue closing or opening instructions to control the operating state of the standby transformer.

The low-voltage combined cabinet 4 includes a low-voltage incoming cabinet 401 , a low-voltage outgoing cabinet 402 , a low-voltage capacitor compensation cabinet 403 and a low-voltage main busbar 404 .

The low-voltage incoming line cabinet 401 is equipped with a current transformer 4011 for detecting current, a low-voltage incoming line isolating switch 4012, a low-voltage incoming line circuit breaker 4013, a voltmeter 4014, an ammeter, a measuring and controlling instrument for measuring temperature, and a changeover switch; The low-voltage outlet cabinet 402 is equipped with a low-voltage outlet circuit breaker 4021, a current transformer and an ammeter for detecting current; an isolating switch 4031, a capacitor 4032 are installed in the low-voltage capacitor compensation cabinet 403, and a current detector for detecting current Transformer, ammeter, small circuit breaker, controller, contactor.

The working principle of the utility model is to automatically detect the actual load data according to the current transformer 4011 and transmit it to the intelligent controller. The high-voltage vacuum circuit breaker in 8 is closed first, and then the low-voltage vacuum circuit breaker in the low-voltage incoming cabinet 203 of the standby transformer is closed again, and the standby transformer 2 is put into operation and enters the parallel working mode; when the on-load capacity regulating substation works at a small capacity, the The intelligent controller sends an opening command, the low-voltage vacuum circuit breaker in the low-voltage incoming line cabinet 203 of the standby transformer is disconnected first, and then the high-voltage vacuum circuit breaker in the high-voltage incoming line control cabinet 8 of the standby transformer is disconnected again, and the standby circuit breaker in the parallel operation mode enters Transformer 2 exits the running 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. the loaded capacity-regulated transformer station of intelligence, is characterized in that: described transformer station includes load capacitance-adjustable transformer body group (2), high-voltage switch gear group (1), low pressure parallel-connection cabinet (3) and low pressure combination sideboard (4), high voltage is delivered to loaded capacity-regulated transformer body group (2) by described high-voltage switch gear group (1), and high-voltage variable is be delivered to low pressure combination sideboard (4) through low pressure parallel-connection cabinet (3) after low-voltage by described loaded capacity-regulated transformer body group (2), wherein, described loaded capacity-regulated transformer body group (2) comprises spare transformer low pressure inlet wire control cubicle (203) and at least two can the transformer of parallel running, described two the transformer of parallel running can comprise a typical transformer (201) and a spare transformer (202), typical transformer (201) and spare transformer (202) respectively with the two-way connection that is in parallel in high-voltage switch gear group (1), described spare transformer low pressure inlet wire control cubicle (203) is connected between spare transformer (202) and low pressure parallel-connection cabinet (3), and according to the size of actual load demand, switching action is carried out to spare transformer (202).

2. the intelligent loaded capacity-regulated transformer station of one according to claim 1, is characterized in that, described two can the model of transformer of parallel running identical, no-load voltage ratio is identical, and impedance voltage is equal and wiring group is identical.

3. the intelligent loaded capacity-regulated transformer station of one according to claim 2, is characterized in that, the wiring group of described transformer is triangle-Y-connection.

4. the intelligent loaded capacity-regulated transformer station of one according to claim 1, is characterized in that, described high-voltage switch gear group (1) comprises High-voltage Incoming Cabinet (5), high-voltage terminal group and spare transformer high pressure inlet wire control cubicle (8); Described high-voltage terminal group comprises the typical transformer high-voltage terminal cabinet (6) being directly connected to typical transformer and the spare transformer high-voltage terminal cabinet (7) being connected to spare transformer through spare transformer high pressure inlet wire control cubicle (8).

5. the intelligent loaded capacity-regulated transformer station of one according to claim 4, is characterized in that, described spare transformer high pressure inlet wire control cubicle (8) is built with high-pressure vacuum breaker.

6. the intelligent loaded capacity-regulated transformer station of one according to claim 1, is characterized in that, described spare transformer low pressure inlet wire control cubicle (203) is built with low-voltage vacuum circuit breaker.

7. the intelligent loaded capacity-regulated transformer station of one according to claim 1, is characterized in that, described low pressure parallel-connection cabinet (3) controls the combined floodgate of spare transformer running status or the intelligent controller of separating brake instruction and ammeter built with sending.

8. the intelligent loaded capacity-regulated transformer station of one according to claim 1, is characterized in that, described low pressure combination sideboard (3) comprises low voltage incoming line cabinet (401), low-pressure line-outgoing cabinet (402), low-voltage capacitance compensating cabinet (403) and low pressure main bus bar (404); Be provided with in described low voltage incoming line cabinet (401) low pressure feed isolating switch (4012), low pressure lead-in circuit breaker (4013), for detect the current transformer (4011) of electric current, voltmeter (4014), ammeter, for the measurement and control instrument of measuring tempeature and change over switch; Low-pressure line-outgoing short-circuiting device (4021) is installed, for detecting current transformer and the ammeter of electric current in described low-pressure line-outgoing cabinet (402); Isolating switch (4031), capacitor (4032) being installed in described low-voltage capacitance compensating cabinet (403), also having current transformer, ammeter, little empty circuit breaker, controller, contactor for detecting electric current.