CN221177357U - Box transformer control loop - Google Patents

Abstract

The utility model discloses a box transformer control loop, comprising: the automatic switching device comprises a collector line breaker, a box transformer high-voltage side breaker, a box transformer, an auxiliary transformer, an uninterruptible power supply, a voltage transformer and an alternating current dual-power supply automatic switching switch; the current collecting circuit breaker is respectively connected with the box transformer high-voltage side breaker and the voltage transformer; the box-type transformer high-voltage side breaker is connected with the box-type transformer; the box-type transformer is connected with the auxiliary transformer; the auxiliary transformer is connected with an alternating-current dual-power automatic change-over switch; the alternating-current dual-power automatic change-over switch is connected with the uninterrupted power supply; the voltage transformer is connected with an alternating-current dual-power automatic change-over switch. The utility model is suitable for the box-type transformer of the distributed new energy power station, and a new standby control power supply loop is constructed by only increasing low-cost components without changing the equipment structure and the box-type capacity, so that the problem of dead zone control in the remote control process in the prior art is solved.

Description

Box transformer control loop

Technical Field

The utility model belongs to the technical field of transformers, and particularly relates to a box transformer control loop.

Background

The fans, the photovoltaic modules and the box-type transformers corresponding to the fans, the photovoltaic modules and the box-type transformers are far in normal positions, wide in distribution range, inconvenient in traffic and long in relative distance between box-type transformers. Therefore, the maintenance and overhaul workload of the box-type transformer is very large. Particularly, with the promotion of the efficiency improvement of the personnel reduction and the unattended operation mode or the unattended operation mode, the continuous remote monitoring and the remote control of each electric device of the power station are realized, and the method is an important means for improving the operation and maintenance capability of the power station and reducing the labor cost.

In the prior art, a small auxiliary transformer is matched with the low-voltage side of each box-type transformer and is used for supplying power to equipment such as illumination, overhaul, temperature controllers, small Uninterruptible Power Supply (UPS) equipment and the like in the box-type transformer, wherein the small UPS is mainly used for supplying power to important loads such as a switch operation power supply, a measurement and control and protection device power supply, an electromagnetic lock, communication equipment and the like on the high and low-voltage side of the box-type transformer. The purpose of setting up UPS power is to guarantee that the case becomes in high, low pressure side and loses within 0.5 ~ 2 hours after the electricity, control, protection, measurement, monitoring return circuit is electrified continually in a short time. The box transformer can be ensured to be in a controlled state within a certain time, but after the power supply time exceeds the accident, the self-contained storage battery of the UPS is exhausted, the box transformer loses the remote control capability, and great difficulty is caused to personnel overhaul, maintenance, monitoring and control of the distributed equipment.

Disclosure of utility model

In view of the above problems, the present utility model discloses a tank transformer control circuit, comprising: the automatic switching device comprises a collector line breaker, a box transformer high-voltage side breaker, a box transformer, an auxiliary transformer, an uninterruptible power supply, a voltage transformer and an alternating current dual-power supply automatic switching switch;

the current collecting circuit breaker is respectively connected with the box transformer high-voltage side breaker and the voltage transformer;

the box-type transformer high-voltage side breaker is connected with the box-type transformer;

The box-type transformer is connected with the auxiliary transformer;

The auxiliary transformer is connected with an alternating-current dual-power automatic change-over switch;

the alternating-current dual-power automatic change-over switch is connected with the uninterrupted power supply;

The voltage transformer is connected with an alternating-current dual-power automatic change-over switch.

Still further, the method further comprises: the tank becomes a low-voltage side breaker;

the box-type transformer is connected with a box-type low-voltage side circuit breaker.

Still further, the method further comprises: an auxiliary transformer low-voltage side switch and a UPS working power supply inlet switch;

One end of the auxiliary transformer low-voltage side switch is connected with the auxiliary transformer, and the other end of the auxiliary transformer low-voltage side switch is connected with the UPS working power supply inlet wire switch.

Still further, the method further comprises: a first load;

The first load is connected with the auxiliary transformer low-voltage side switch.

Still further, the first load includes lighting, service, and heating loads.

Still further, the method further comprises: a standby power supply inlet wire switch;

One end of the standby power supply inlet wire switch is connected with the voltage transformer, and the other end of the standby power supply inlet wire switch is connected with the alternating current dual-power supply automatic change-over switch.

Further, one or two standby power supply inlet wire switches are arranged;

When a standby power supply inlet switch is arranged, the standby power supply inlet switch is arranged close to the voltage transformer;

When two standby power supply inlet wire switches are arranged, one standby power supply inlet wire switch is arranged close to the voltage transformer, and the other standby power supply inlet wire switch is arranged close to the alternating current dual-power supply automatic change-over switch.

Further, the voltage transformer is single-phase or three-phase.

Still further, the method further comprises: a second load;

The second load is connected with an uninterruptible power supply.

Still further, the second load includes protection, control and communication loads.

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

1. The box-type transformer is suitable for a distributed new energy power station, a new standby control power supply loop is constructed by not changing the equipment structure, not changing the box-type capacity and only increasing low-cost components, the automatic switching of power supply is realized, and the problem that a remote control flow is in a dead zone control state in the prior art is solved;

2. In general, the larger the capacity of the box-type transformers of the same type is, the higher the price is, and the price of the added item is relatively fixed, and the added item is not increased due to the increase of the capacity of the box-type transformers, so that the method has the advantage of extremely low cost added item relative to the price ratio of box-type transformer equipment; through preliminary estimation, according to different capacities of the transformers, the cost increment of the utility model accounts for 0.3-1.5% of the total price of the transformers;

3. The utility model has the advantages of economy, convenience and flexibility, improves the operation safety and reliability, is suitable for new energy projects with more box numbers or more scattered arrangement, and is particularly suitable for new energy stations which are inconvenient in traffic and difficult to reach for overhaul in time; the utility model is used as an important means for guaranteeing personal safety, improving the recovery power supply speed, timely troubleshooting equipment faults and saving manpower and material resources, greatly improves the safety of operation and maintenance personnel, the remote controllability of electrical equipment and the convenience of operation and maintenance work, shortens the power failure time, reduces the power generation loss of new energy power stations and has higher economic and social benefits.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a schematic diagram of a tank change control loop according to an embodiment of the utility model;

fig. 2 shows a box-section control logic diagram according to an embodiment of the present utility model.

Reference numerals: 1. a collector line breaker; 2. a tank transformer high-voltage side circuit breaker; 3. a box-type transformer; 4. the tank becomes a low-voltage side breaker; 5. an auxiliary transformer; 6. an auxiliary transformer low side switch; 601. UPS working power supply inlet wire switch; 602. a first load; 7. an uninterruptible power supply; 701. a second load; 8. a voltage transformer; 9. a standby power supply inlet wire switch; 10. an alternating current dual power supply automatic change-over switch.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Fig. 1 shows a schematic diagram of a tank control loop according to an embodiment of the utility model. As shown in fig. 1, a tank transformer control circuit according to the present utility model includes: the automatic switching device comprises a collecting line breaker 1, a box transformer high-voltage side breaker 2, a box transformer 3, an auxiliary transformer 5, an uninterruptible power supply 7, a voltage transformer 8 and an alternating current double-power automatic switching switch 10;

The collecting line breaker 1 is respectively connected with the box transformer high-voltage side breaker 2 and the voltage transformer 8;

The box-type transformer high-voltage side breaker 2 is connected with a box-type transformer 3;

The box-type transformer 3 is connected with an auxiliary transformer 5;

the auxiliary transformer 5 is connected with an alternating-current dual-power automatic change-over switch 10;

The alternating-current dual-power automatic change-over switch 10 is connected with the uninterrupted power supply 7;

the voltage transformer 8 is connected with an alternating current dual-power automatic change-over switch 10.

The collecting line breaker 1 is positioned in a high-voltage switch cabinet of the new energy station and is used for breaking working current or fault current between the box transformer and the collecting line;

The box transformer high-voltage side breaker 2 is arranged in a high-voltage switch cabinet in the box transformer box body and is used for changing the working state of a transformer or isolating the transformer from other electrical elements when faults occur;

a box-type transformer 3 for changing a voltage level, boosting or stepping down;

An auxiliary transformer 5 for obtaining a low-voltage side power supply from the transformer body and supplying power to a low-voltage load in the box-type transformer housing;

the uninterrupted power supply 7 is used for storing energy and supplying power, and short-time power is supplied to important loads through the energy storage device after the external power supply is lost;

The alternating current dual-power automatic change-over switch 10 is used for automatically connecting to a standby power supply through a switching function when the common power is suddenly cut off or fails.

The voltage transformer 8 can be installed in a high-voltage side switch cabinet of the box transformer, and is mainly used for reducing the power supply of an alternating current 35kV or 10kV collecting circuit at the power grid side into an alternating current 220V low-voltage power supply (called a low-voltage power supply 2 for short), and the power supply can provide power for an uninterruptible power supply 7 (called a UPS for short), and can be used as a main power supply and a standby power supply.

The small-sized alternating-current dual-power automatic change-over switch 10 is arranged in a low-voltage side switch cabinet of the box, and does not need an additional power supply, and the main function is to automatically switch the low-voltage power supply 1 and the low-voltage power supply 2 when the power supply on one side is suddenly powered off or fails by detecting the power supply state of the line incoming to the working power supply 1 (the box type transformer 3 and the auxiliary transformer 5) and the standby power supply 2, switch the contacts of the switch to the side with power supply detected, and continuously provide power for the uninterrupted power supply 7. The ac dual-power automatic transfer switch 10 can automatically detect whether or not the working power supply and the standby power supply are powered without external power supply, and automatically transfer the power to the active side according to the detection result. The switching time of the ac dual-power automatic switching switch 10 varies from a few milliseconds to a few seconds, and the ac dual-power automatic switching switch 10 with higher switching speed or slower switching speed can be selected according to the requirements and budget conditions of users.

After the uninterruptible power supply 7 obtains the power, power can be supplied to important loops of the box transformer, such as control, protection, communication and the like, which becomes a precondition for realizing the control loop of the utility model.

The utility model is characterized in that a voltage transformer 8 for a power supply is arranged between a breaker 2 at the high-voltage side of the box transformer and the outlet position of a current collecting line, a line-in switch 9 for a standby power supply is arranged in a switch cabinet at the high-voltage side of the box transformer, a small-sized automatic alternating-current double-power-supply switch 10 is arranged in the switch cabinet at the low-voltage side of the box transformer, and the important loops in the whole box body (within the range of a broken line frame in fig. 1) of the box transformer 3 are continuously supplied with power or are supplied with power in advance before the box transformer resumes operation, so that power station monitoring personnel can remotely receive the communication information of the box transformer and related equipment, monitor the operation state of the box transformer in situ, keep the relay protection device to normally operate and control the withdrawal/operation of the box transformer under the conditions of normal operation and long-time power failure of the box transformer.

The utility model is suitable for the box-type transformer 3 of the distributed new energy power station, builds a new standby control power supply loop by not changing the equipment structure, not changing the box-type variable capacity and only increasing low-cost components, realizes automatic switching of power supply, and solves the problem of the 'control dead zone' of the remote control flow in the prior art.

The utility model provides a box transformer substation control loop by combining the characteristics of a new energy station, continuously supplying power or recovering power in advance before the box transformer substation is put into operation again, solves the problem of 'control dead zone' existing in the control method of the prior art on the premise of not changing the equipment structure, not changing the capacity of the box transformer substation and only increasing low-cost components, and provides a feasible, reliable and economic and effective control loop which achieves the aim of 'successful box transformer substation operation' in a plurality of ways on control logic.

In some embodiments, the tank change control loop further comprises: a tank low-voltage side breaker 4;

The tank transformer 3 is connected to a tank low-voltage side breaker 4.

The tank low-voltage side breaker 4 is connected with a fan or a photovoltaic module and an inverter.

The low-voltage side breaker 4 is arranged in a low-voltage switch cabinet in the box transformer box body and used for changing the working state of the transformer or isolating the transformer from other electrical components when faults occur.

In some embodiments, the tank change control loop further comprises: an auxiliary transformer low-voltage side switch 6 and a UPS working power supply inlet switch 601;

One end of the auxiliary transformer low-voltage side switch 6 is connected with the auxiliary transformer 5, and the other end is connected with the UPS working power supply inlet switch 601. The UPS working power supply inlet switch 601 is connected with the AC dual-power automatic change-over switch 10.

The auxiliary transformer low-voltage side switch 6 is used for switching off the working current or the fault current of the power supply loop.

The UPS working power supply line switch 601 is used to break the working current or fault current of the branch power supply circuit.

In some embodiments, the tank change control loop further comprises: a first load 602;

The first load 602 is connected to the auxiliary transformer low side switch 6.

In some embodiments, the first load 602 includes lighting, service, and heating loads.

In some embodiments, the tank change control loop further comprises: a standby power supply inlet switch 9;

One end of the standby power supply inlet wire switch 9 is connected with the voltage transformer 8, and the other end is connected with the alternating current dual-power supply automatic change-over switch 10.

The standby power inlet wire switch 9 is used for leading the voltage of the 220V side of the single-phase voltage transformer 8 for power supply, plays a role in protecting a 220V power supply loop, can be arranged in a high-voltage side switch cabinet of the box transformer, can also be arranged in a low-voltage side switch cabinet, and a 220V voltage source at the outlet of the standby power inlet wire switch 9 is led to the standby power input side of the small-sized alternating-current dual-power automatic change-over switch 10 through a cable.

In some embodiments, the standby power inlet switch 9 is provided with one or two;

When a standby power supply inlet switch 9 is arranged, the standby power supply inlet switch 9 is arranged close to the voltage transformer 8;

when two standby power supply inlet wire switches 9 are arranged, one standby power supply inlet wire switch 9 is arranged close to the voltage transformer 8, and the other standby power supply inlet wire switch 9 is arranged close to the alternating current double-power supply automatic change-over switch 10. The whole-course protection of the cable line and the protection cooperation of upper and lower switches are realized.

The power supply is indirectly supplied to the uninterrupted power supply 7 by leading a high-reliability power supply from the power grid side, a primary alternating-current dual-power automatic change-over switch 10 is added in the middle to serve as a standby loop, the uninterrupted power supply 7 is not directly supplied with power, the power supply time of the box transformer auxiliary power supply is additionally increased on the basis that the uninterrupted power supply 7 firstly supplies 0.5-2 hours of emergency power supply time, and the power supply reliability is improved as a double guarantee means.

In some embodiments, the voltage transformer 8 is of the single-phase type or of the three-phase type.

The single-phase voltage transformer 8 has small volume, simple wiring and more economical efficiency, and completely meets the use requirement of the utility model.

In some embodiments, the tank change control loop further comprises: a second load 701;

the second load 701 is connected to the uninterruptible power supply 7.

In some embodiments, the second load 701 includes protection, control, and communication loads.

Alternatively, in some embodiments, the first load 602 may be combined with the second load 701, and connected to the ups 7 to obtain a reliable power source.

Optionally, in some embodiments, when 3 low-voltage ac power supplies are provided for input, 2 ac dual-power automatic switches 10 may be selected, where the 1 st and 2 nd low-voltage ac power supplies perform first-round dual-power switching, and the switched power supplies and the 3 rd low-voltage ac power supplies perform second-round dual-power switching, so that important power supply reliability is improved.

In general, the larger the capacity of the box-type transformers 3 of the same type is, the higher the price is, the price of the added item is relatively fixed (each box is reduced to be added with thousands of primordial coins), and the added item is not increased due to the increase of the capacity of the box-type transformers 3 (the price of each box-type transformer 3 is about hundreds of thousands to nearly millions of primordial coins), so the method has the advantage that the cost added item is extremely low relative to the price ratio of box-type transformer equipment; through preliminary estimation, the cost increment of the utility model accounts for 0.3 to 1.5 percent of the total price of the transformer according to the different capacities of the transformers.

The utility model has the advantages of economy, convenience and flexibility, improves the operation safety and reliability, is suitable for new energy projects with more box numbers or more scattered arrangement, and is particularly suitable for new energy stations which are inconvenient in traffic and difficult to reach for overhaul in time; as an important means for guaranteeing personal safety, improving the recovery power supply speed, timely checking equipment faults and saving manpower and material resources, the safety of operation and maintenance personnel, the remote controllability of electrical equipment and the convenience of operation and maintenance work are greatly improved, the power failure time is shortened, the power generation loss of a new energy power station is reduced, and the method has higher economic and social benefits.

As shown in fig. 2, the utility model provides a box-type substation control method based on the box-type substation control loop;

The specific control mode of the utility model is as follows:

(1) When the box transformer is in normal operation (short for "normal working condition"), "the low-voltage power supply 1" is put into operation, and "the low-voltage power supply 2" is in a standby state.

(2) When the box transformer or the related line/switch fails, the box transformer high-voltage side circuit breaker 2 and the box transformer low-voltage side circuit breaker 4 trip respectively or simultaneously, and the box transformer is off-grid and loses self-power. At this time, the 35kV (or 10 kV) side current collecting circuit is divided into two working conditions of no electricity and electricity.

(3) For the 35kV (or 10 kV) side no-power working condition, the control sequence is as follows:

The box transformer high-voltage side breaker 2 and the box transformer low-voltage side breaker 4 are in a switching-off state, and the high-voltage side and the low-voltage side of the box transformer 3 lose external power supply, so that the box transformer low-voltage side auxiliary transformer 5 loses power, the auxiliary transformer self-contained uninterruptible power supply 7 loses external alternating current power supply, the alternating current double-power automatic change-over switch 10 detects that the standby power supply is not powered, the state is kept, and automatic switching does not occur. The UPS discharges the battery for 0.5-2 hours, during which the UPS can provide power for control, relay protection and communication for a short time, and then the power reserve of the UPS is exhausted, so that the UPS loses contact with the monitoring background.

When the new energy station resumes the power supply, the control sequence is to put the high-voltage side main transformer into operation, then put the 35kV (or 10 kV) collecting circuit into operation, finally put into the box transformer and the on-site electrical equipment corresponding to wind power/photovoltaic. Corresponding to the illustration in fig. 1, after the 35kV (or 10 kV) collecting line is put into operation, the collecting line breaker 1 is in a closing state, at this time, an electrical loop between the box-type high-voltage side breaker 2 and the collecting line breaker 1 is electrified, that is, the single-phase voltage transformer 8 for power supply is electrified, and the cable at the side of the standby power supply inlet wire switch 9 is electrified. The automatic alternating-current dual-power supply change-over switch 10 detects that the working power supply is not powered and the standby power supply is powered, automatically switches a contact to the standby side, puts the 'low-voltage power supply 2' into operation, and charges the UPS again, and at the moment, the charging of the switch energy storage motor at the high and low voltage sides of a box powered by the UPS is completed, and waits for the switching-on operation; the relay protection device powered by the UPS is charged, so that the state of the box transformer can be monitored and judged, and the box transformer and related switches are ensured to have no alarm signal; the communication equipment powered by the UPS is electrified, and information transmission to the power station monitoring background is recovered, so that real-time monitoring of personnel on the box transformer and auxiliary equipment is ensured; after the equipment is normally operated, operation and maintenance personnel can remotely switch on the high-voltage side circuit breaker 2 of each box and the low-voltage side circuit breaker 4 of each box, so that the power station can recover power supply.

The control method realizes that the important load restores power supply in advance before the box transformer substation is put into operation again, the control is not lost due to the off-grid power loss of the box transformer substation, the remote monitoring and control of the box transformer substation by operators are not influenced, and the manual control of the operators on site is not needed.

(4) For the 35kV (or 10 kV) side power-on working condition, the control sequence is as follows:

If the 35kV (or 10 kV) collecting line is still normally electrified after the box transformer substation is powered off by self, the alternating current double-power automatic change-over switch 10 detects that the working power supply is not electrified and the standby power supply is electrified, the contact is automatically switched to the standby side, and the power loads such as control, relay protection, communication and the like are continuously electrified, so that operation and maintenance personnel can remotely and continuously monitor on-site equipment to wait for the box transformer substation to restart the operation control instruction.

As can be seen from fig. 2, after the standby power supply connection point is added and the automatic power supply switching is realized, the dead zone of the box transformer operation failure is eliminated in the box transformer operation control process. The control method realizes continuous power supply of the important load of the box transformer substation, ensures that the box transformer substation is not lost in control due to off-grid power loss, does not influence remote monitoring and control of operation personnel on the box transformer substation, and does not need manual control on site by personnel under the condition of no equipment failure.

The utility model can solve the incontrollable defect existing in the prior art under the two working conditions. The system has the advantages of high safety and high reliability, improves the automation degree of the operation of the power station, obtains large benefits with small cost, including economic benefits, social benefits and the like, greatly saves the cost of manpower and material resources, greatly improves the operation mode flexibility of the new energy power station, shortens the power failure time, and reduces the power generation capacity loss of the new energy power station.

The utility model is not only used for the box type transformers of distributed or centralized new energy power stations such as large, medium and small wind power stations, large, medium and small photovoltaic stations and the like, but also suitable for the box type transformers of civil, mine, factory enterprises, oil and gas fields and other projects. The terminal mode and the ring network mode of the high-voltage side connection mode of the box transformer are applicable. The box-type transformer is particularly suitable for unattended operation, less attended operation, remote geographical positions and scattered arrangement.

After the box-type transformer is stopped for a long time and loses self-supply and storage battery reserve power supply, the utility model eliminates the defect link in the remote control method in the prior art by adding a more reliable standby control power supply. According to different power-losing working conditions of the box transformer substation, the control power supply can be continuously supplied or recovered in advance before restarting, and the remote monitoring and remote control commissioning of the box transformer substation are realized, so that the box transformer substation power supply does not need to be manually recovered one by one to the site by an operator.

The utility model improves the operation safety, reliability, economy, convenience and flexibility of the power station, is particularly suitable for new energy power stations with more box numbers or more scattered arrangement, and is an important method for guaranteeing personal safety, improving the recovery power supply speed, checking equipment faults in time and saving manpower and material resources.

As shown in fig. 1, the present utility model is illustrated by way of example with a delta-Y wired two-winding three-phase box transformer 3. The box transformer high-voltage side adopts the box transformer high-voltage side breaker 2 to protect and control, and the box transformer low-voltage side adopts the box transformer low-voltage side breaker 4 to protect and control, and supporting overload protection device protects and controls box transformer body and box transformer high-voltage side breaker 2, box transformer low-voltage side breaker 4 in addition.

When the box transformer normally operates, the current collecting circuit breaker 1, the box transformer high-voltage side circuit breaker 2 and the box transformer low-voltage side circuit breaker 4 are all in a closing state, and electric quantity generated by power generation equipment such as a fan or a photovoltaic panel is transmitted to a high-voltage power grid through a cable line or an overhead line of the closing loop. At this time, the box-type transformer 3 is electrified, the auxiliary transformer 5T is connected to the low-voltage side of the box and electrified, the auxiliary transformer low-voltage side switch 6 of the auxiliary transformer 5 and the UPS working power supply inlet switch 601 are both in a closed electrified state, the UPS 7 is in an electrified state, and the important second load 701 below the UPS is in an electrified normal working state.

The utility model provides a new scheme for solving the problem of the prior art 'control dead zone' control method, as shown in figure 1, in the corresponding wiring scheme, components, cables, related wiring terminals and the like are newly added, wherein the components comprise: voltage transformer 8, standby power inlet wire switch 9, ac dual-power automatic change-over switch 10.

Working condition one: when an operator remotely withdraws the box-type transformer 3 to run, the box-type transformer 3 needs to be disconnected from the high-voltage side breaker 2 and the box-type transformer low-voltage side breaker 4, and the breaker/switch is in a breaking state after the box-type transformer 3 is disconnected from a power grid and a wind power/photovoltaic power supply, so that the box-type transformer 3 loses an external power supply. Therefore, the auxiliary transformer 5 is powered off, the auxiliary transformer low-voltage side switch 6 is powered off no matter in a closing/opening state, the corresponding UPS working power supply inlet switch 601 is powered off, the first load 602 which is powered by the box transformer auxiliary transformer except the second load 701 is powered off, and the important second load 701 below the uninterruptible power supply 7 is powered off after a certain accident discharge time.

At this time, if the collecting line breaker 1 is in a closing state and the power supply T contact of the single-phase voltage transformer 8 for power supply is powered on, the ac dual-power automatic transfer switch 10 detects that the standby power inlet switch 9 is powered on, automatically turns on the contact to the standby power side, the uninterruptible power supply 7 continuously obtains an external power supply, and the important second load 701 powered by the external power supply continuously works, at this time, the overall control loop is in a smooth and feasible state, and the local box becomes completely controlled.

At this time, if the collecting line breaker 1 is in a breaking state or a losing state, the power T contact of the single-phase voltage transformer 8 for power supply is not powered, the automatic alternating-current dual-power switch 10 detects that the standby power inlet switch 9 is not powered, and the switching contact does not act. The uninterruptible power supply 7 loses the external power supply, continues to supply power to the power-consuming load for 0.5-2 hours by means of the reserved power of the storage battery of the uninterruptible power supply, and then the second load 701 is completely powered off. Monitoring personnel lose monitoring, recording and controlling of the box transformer, the switch, the matched equipment and the like. The overall control loop is in an off-line state and the on-site tank becomes uncontrolled.

Working condition II: the box transformer is withdrawn caused by the faults of components such as the box transformer, the circuit breaker and the like. The in-situ equipment condition is the same as the first working condition.

According to the operation flow of the power station, no matter the operation flow of the power station is the tripping operation of the high-low voltage side switch of the box transformer caused by the manual mode or the fault, before the box transformer is overhauled and put into operation again, a monitoring person carries out switching-on operation on a circuit connected with a high-voltage power grid and the current collection circuit breaker 1 in a remote mode, and then carries out switching-on operation on the high-voltage side circuit breaker 2 of the box transformer and the low-voltage side circuit breaker 4 of the box transformer, so that the box transformer can be put into operation again, namely the power supply sequence is recovered to be high voltage before low voltage.

After the collecting line breaker 1 is put into operation, the line at the position of the single-phase voltage transformer 8 for power supply is electrified, that is, the low-voltage side of the single-phase voltage transformer 8 for power supply can supply power to the automatic switching switch 10 for alternating current double power supply. The ac dual-power automatic change-over 10 detects that the "low-voltage power 1" is dead and the "low-voltage power 2" is charged, and switches to the "low-voltage power 2" loop after a period of several milliseconds to several seconds (note: the switching period depends on the selection of the change-over, generally, the shorter the switching period is, the higher the price of components is, the lower the requirement for the change-over time for the box-type transformer operation is, and from the economical point of view, the second-level change-over is selected). The uninterruptible power supply 7 is restored to charge and can continue to supply power to the important power loads.

Wherein:

(1) The load of the measurement and control and protection integrated equipment device in the important power load is used for charging the device, can monitor important information related to safe operation such as current, voltage, temperature, switching state and the like of the box transformer and the circuit breaker after the charging is completed, and can receive a closing instruction of a remote operator. If the box transformer or the current collecting circuit still has faults at the moment, the measurement and control and protection integrated device transmits fault information to the background through communication equipment, so that operation and maintenance personnel can continuously check the faults, the operation of suspending the operation of the box transformer is prevented from being performed on site, and the situation that in the prior art, an on-site operator is directly and manually forced to perform switching on under the condition that the fault state of equipment cannot be known is avoided, relay protection action is caused, a switch trips off the network again, and personal and equipment injury is caused again.

(2) The circuit breaker energy storage loop load in the important electricity load is used for supplying power to the circuit breaker energy storage motor at the high and low voltage sides of the box transformer, ensuring that the circuit breaker has enough energy to wait for a closing instruction and complete closing operation, and realizing that the box becomes a power operation.

In some embodiments, the auxiliary transformer 5 of the present utility model is moved to the high side of the transformer, instead of the single-phase voltage transformer 8 for power, the auxiliary transformer 5 still adopts the wiring scheme of fig. 1. The scheme can convert the alternating current 10kV or 35kV voltage of the current collecting circuit into an alternating current 380/220V power supply or other similar low-voltage power supplies through the small auxiliary transformer 5. The alternative scheme can still ensure that the control loop is powered back in time, and other loop power supplies such as maintenance, illumination, heating and the like can be recovered in time, so that when an maintainer goes to the site to troubleshoot or overhaul equipment, large-scale equipment such as a temporary power supply and the like can be omitted.

The volume and primary parameters of the related small auxiliary transformer 5 are larger than those of the prior art and the utility model, and the manufacturing cost is slightly higher, but the AC double-power automatic transfer switch 10 is not required to be added. In conclusion, the divergent thinking scheme has slightly high manufacturing cost, is more convenient to overhaul, and can be selected for use after comprehensive comparison of various factors such as user demands, economy, convenience and the like in practical application.

The utility model discloses a new method for realizing remote control of a box transformer, which is characterized in that from the perspective of recovering an auxiliary power supply after the box transformer loses power, a new standby power supply leading point is added through ①, and a voltage-reducing power supply voltage transformer 8 is arranged at the leading point; ② The small-sized alternating current dual-power automatic change-over switch 10 is added, and the standby power supply after voltage reduction and the original working power supply are automatically switched to supply power to the UPS; ③ The switched effective power supply supplies power to important loops such as control and relay protection through the original UPS, so that the box transformer substation can obtain continuous and reliable control power after tripping or before restarting, and the complete remote control of the box transformer substation is realized.

Although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. A tank control circuit comprising: the automatic switching device comprises a collecting circuit breaker (1), a box-type transformer high-voltage side breaker (2), a box-type transformer (3), an auxiliary transformer (5), an uninterruptible power supply (7), a voltage transformer (8) and an alternating current dual-power automatic switching switch (10);

The current collecting circuit breaker (1) is respectively connected with the box transformer high-voltage side breaker (2) and the voltage transformer (8);

The box-type transformer high-voltage side breaker (2) is connected with the box-type transformer (3);

the box-type transformer (3) is connected with the auxiliary transformer (5);

The auxiliary transformer (5) is connected with an alternating-current dual-power automatic change-over switch (10);

the alternating-current dual-power automatic change-over switch (10) is connected with the uninterrupted power supply (7);

The voltage transformer (8) is connected with an alternating current dual-power automatic change-over switch (10).

2. The tank change control circuit of claim 1, further comprising: a tank low-voltage side breaker (4);

The box-type transformer (3) is connected with a box-type low-voltage side breaker (4).

3. The tank change control circuit of claim 1, further comprising: an auxiliary transformer low-voltage side switch (6) and a UPS working power supply inlet switch (601);

One end of the auxiliary transformer low-voltage side switch (6) is connected with the auxiliary transformer (5), and the other end of the auxiliary transformer low-voltage side switch is connected with the UPS working power supply inlet switch (601).

4. A tank change control circuit according to claim 3, further comprising: a first load (602);

the first load (602) is connected to an auxiliary transformer low-side switch (6).

5. The tank change control circuit of claim 4, wherein the first load (602) comprises lighting, service and heating loads.

6. The tank change control circuit of claim 1, further comprising: a standby power supply inlet wire switch (9);

One end of the standby power supply inlet wire switch (9) is connected with the voltage transformer (8), and the other end is connected with the alternating current dual-power supply automatic change-over switch (10).

7. The tank transformer control circuit according to claim 6, characterized in that the standby power inlet switch (9) is provided with one or two;

When a standby power supply inlet wire switch (9) is arranged, the standby power supply inlet wire switch (9) is arranged close to the voltage transformer (8);

When two standby power inlet wire switches (9) are arranged, one standby power inlet wire switch (9) is arranged close to the voltage transformer (8), and the other standby power inlet wire switch (9) is arranged close to the alternating current double-power automatic change-over switch (10).

8. The tank transformer control circuit according to claim 1, characterized in that the voltage transformer (8) is of single-phase or three-phase type.

9. The tank change control circuit of claim 1, further comprising: a second load (701);

the second load (701) is connected to an uninterruptible power supply (7).

10. The tank transformer control circuit according to claim 9, characterized in that the second load (701) comprises protection, control and communication loads.