CN218383722U - Oil-immersed transformer cooler control system - Google Patents
Oil-immersed transformer cooler control system Download PDFInfo
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- CN218383722U CN218383722U CN202221722633.XU CN202221722633U CN218383722U CN 218383722 U CN218383722 U CN 218383722U CN 202221722633 U CN202221722633 U CN 202221722633U CN 218383722 U CN218383722 U CN 218383722U
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Abstract
The utility model belongs to the technical field of the maintenance, concretely relates to oil-immersed transformer cooler control system. The cooling system comprises four cooler switch cabinets and a cooler PLC control cabinet, wherein the four cooler switch cabinets are respectively connected with the cooler PLC control cabinet. The four cooler switch cabinets comprise a first group of cooler switch cabinets, a second group of cooler switch cabinets, a third group of cooler switch cabinets and a fourth group of cooler switch cabinets. The beneficial effects of the utility model reside in that: the cooler control system checks that the fan and the oil pump have no alarm information under the condition that the alternating current power supply and the direct current power supply are available, and then starts and stops the fan and the oil pump of the cooler according to a control mode selected by a user.
Description
Technical Field
The utility model belongs to the technical field of the maintenance, concretely relates to oil-immersed transformer cooler control system.
Background
Oil-immersed transformers are important components of power plants and substations, and losses generated in the operation process of the transformers comprise no-load losses and load losses. The no-load loss is irrelevant to the size of the load and is the loss generated in the running process of the transformer. The load loss is mainly copper loss, i.e. the loss generated by the load current flowing through the transformer winding, which is related to the magnitude of the load and proportional to the square of the load factor. In the operation process of the transformer, the loss in the iron core and the winding is radiated in the form of heat, so that the temperature of the winding, the iron core and the transformer oil of the transformer is increased.
The temperature of the winding is highest when the oil-immersed transformer normally operates, the temperature of the iron core is second, the temperature of the transformer oil is lowest, and the upper layer of the temperature of the transformer oil is higher than the lower layer of the temperature of the transformer oil. In order to prevent oil deterioration, the temperature of the oil on the upper layer does not exceed 95 ℃ at most, the winding does not exceed 105 ℃ at most, and when the temperature exceeds the maximum temperature, the service life of the insulating paper board in the transformer is reduced by half every time the temperature rises by 6 ℃. In addition, when the operating temperature of the transformer exceeds 140 ℃, the transformer oil is decomposed to generate combustible gas, and the safe operation of the transformer is seriously threatened. The operating temperature of the transformer thus determines the service life of the transformer. The reliability of the cooling system of the transformer determines the safe and proper operation of the transformer and its service life.
The main transformer of more than 110kV generally adopts a self-circulation air cooling or strong oil circulation air (water) cooling mode.
At present, a 500kV main transformer generally comprises three single-phase transformers, each transformer comprises four groups of coolers, and each group of coolers comprises three fans and an oil pump. The main transformer air-cooling control system consists of three air-cooling control cabinets (3) and a power box.
The three air-cooled control cabinets of the ABC three phases of the main transformer operate independently and are controlled in a centralized mode, namely the three air-cooled control cabinets control the coolers of the ABC three phases of the main transformer respectively, each control cabinet controls four groups of coolers, and the control cabinets are not in communication. A main circuit element in the air-cooling control cabinet is a contactor, a control loop uses a relay, and a protection loop arranged in an air-cooling branch control box realizes overload protection of a fan and an oil pump by adopting a fuse and a thermal relay. Two independent alternating current power supplies in the main transformer air-cooled power box.
The control system has low reliability, high failure rate, low automation degree and large workload of maintenance and repair. Taking a main transformer A-phase air-cooled control cabinet as an example, the control cabinet controls all coolers and oil pumps of the main transformer A-phase. When the A-phase air-cooled control cabinet of the main transformer fails or internal main loop components fail and need to be powered off for maintenance, the whole A-phase air-cooled control cabinet of the main transformer needs to be powered off, all coolers of the A-phase air-cooled control cabinet of the main transformer can be lost at the moment, the operation condition is called as a transformer cooler full stop event, and according to the requirements of a transformer operation technical specification, the unit needs to be operated in a power reduction mode or even stopped, so that the stable operation of the unit is seriously influenced.
When any one phase of air-cooled control cabinet of the main transformer has a serious fault and must be overhauled in a power failure mode or the control function is failed, the phase-change transformer loses all cooling functions, and a unit is exposed to the risk of power reduction or shutdown, so that the stable operation of the unit is seriously influenced. In addition, most air-cooled switch boards and power cabinets are arranged on the air outlet side of the main transformer cooler, the temperature in the cabinet reaches 60 ℃ in summer high-temperature days, the temperature of the wiring terminals is too high in summer high-temperature seasons, and the frequency of faults of the contactors and the relays is large, so that the stable operation of the main transformer is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an oil-immersed transformer cooler control system can improve the steady operation that becomes effectively.
The technical scheme of the utility model as follows: the utility model provides an oil-immersed transformer cooler control system, includes four cooler cubical switchboard and a cooler PLC switch board, four cooler cubical switchboard be connected with cooler PLC switch board respectively.
The four cooler switch cabinets comprise a first group of cooler switch cabinets, a second group of cooler switch cabinets, a third group of cooler switch cabinets and a fourth group of cooler switch cabinets.
And the first group of cooler switch cabinets, the second group of cooler switch cabinets, the third group of cooler switch cabinets and the fourth group of cooler switch cabinets are not in communication connection.
And oil pump and fan state signals of the first group of cooler switch cabinets, the second group of cooler switch cabinets, the third group of cooler switch cabinets and the fourth group of cooler switch cabinets are fed back to a PLC in the cooler PLC control cabinet through the respective cooler switch cabinets.
PLC in the cooler PLC control cabinet controls the operation and stop of the main transformer ABC three-phase cooler by controlling intermediate relays A01XR in the four cooler switch cabinets.
The power supply also comprises two paths of direct current power supplies.
The two paths of direct current power supplies comprise a first direct current power supply and a second direct current power supply.
The first direct current power supply is connected to the PLC control cabinet of the cooler and is sequentially connected to the first group to the fourth group of cooler switch cabinets in a jumper mode.
And the second direct current power supply is connected to the fourth group of cooler switch cabinets, is opposite to the first direct current wiring direction, and is connected to the cooler PLC control cabinet finally.
The beneficial effects of the utility model reside in that: and a man-machine interaction interface installed on the control cabinet is compiled by adopting Wincc. In the normal mode, an operator can check the running state of each cooler by clicking the touch screen; checking whether alarm information exists or not; looking at the chiller run time; checking alarm records, etc., and changing the operating state of the cooler in the automatic mode, etc. The cooler control system checks that the fan and the oil pump have no alarm information under the condition that the alternating current power supply and the direct current power supply are available, and then starts and stops the fan and the oil pump of the cooler according to a control mode selected by a user.
Drawings
FIG. 1 is a layout of a control cabinet and a switch cabinet;
FIG. 2 is a schematic diagram of a switchgear control;
FIG. 3 is a schematic diagram of the AC power connection;
FIG. 4 is a schematic diagram of DC power connections;
FIG. 5 is a schematic diagram of a control method;
fig. 6 is a system flow diagram.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a transformer cooler control system, this system change the original control mode of main transformer cooler control system, will "centralized control" change into "packet control", a set of cooler that every transformer was only controlled to an air-cooled switch board promptly. After the control mode is changed, when a certain control cabinet has a major fault, only the coolers controlled by the group of control cabinets are affected, and other three groups of coolers cannot be affected. The power box and the control cabinet related to the control system of the main transformer cooler are moved indoors, and the influence of high environmental temperature on equipment is eliminated.
Three control cabinets and a power supply power box of the original main transformer air cooling system are dismantled, a thermal relay in an air cooling branch control box is dismantled, and only a wiring terminal block is reserved.
Four low-voltage switch cabinets and a control cabinet are added, the cabinet body is arranged in a workshop near the main transformer,
each low-voltage switch cabinet is composed of 12 low-voltage drawers, an ATS (automatic transfer switch) and an incoming line interval. The control cabinet mainly comprises a PLC (Siemens S7-1500), a relay and other control loops and a human-computer interaction interface (HMI), wherein the human-computer interaction interface adopts a Siemens TOUCH PANEL series industrial personal computer.
The power supply selects two independent alternating current power supplies I and II, the two alternating current power supplies firstly enter the bus space at the top of the first group of cooler switch cabinets and then enter the bus rooms in the second group of cooler switch cabinets to the fourth group of cooler switch cabinets in a copper bar connection mode. An automatic transfer power switch (ATS) is arranged in each control cabinet, and a power supply passes through the ATS and then is connected to a busbar of the control cabinet through a cable. The ATS switch has automatic switching and manual switching functions, and the manual switching comprises electronic manual switching and handle manual switching.
The control power supplies of the four cooler switch cabinets and the cooler PLC control cabinet all adopt a direct-current power supply control mode. The control power supply is two independent direct current power supplies.
As shown in fig. 1, a control system for a cooler of an oil-immersed transformer includes four cooler switch cabinets and a cooler PLC control cabinet, where the first to fourth groups of cooler switch cabinets respectively control a first, a second, a third, and a fourth group of coolers of ABC three phases of a main transformer. As shown in fig. 4, the status signals of the oil pumps and fans of the first, second, third and fourth groups of coolers are fed back to the PLC in the PLC control cabinet of the coolers through the respective cooler switch cabinets. There is no communication between the four cooler switch cabinets.
As shown in fig. 5, in the automatic mode, the PLC in the PLC cabinet of the cooler controls the operation and stop of the ABC three-phase cooler of the main transformer by controlling the intermediate relays a01XR in the four-cooler switch cabinets. Under the manual mode, PLC in the cooler PLC cabinet loses the control function, and can only pass through the auxiliary relay A02XR from the start of reset switch, the manual operation that passes through of stopping of four cooler cubical switchboard to the operation and the stop of main transformer ABC three-phase cooler of control.
As shown in fig. 2, two ac power sources introduced into the control system are connected to busbars on the tops of four cooler switch cabinets, and then are respectively connected to ac main buses in the cabinets through ac power switching devices (ATS) in the cabinets.
As shown in fig. 3, two dc power supplies, i.e., a first dc power supply and a second dc power supply, are introduced into the control system, where the first dc power supply is first connected to the PLC control cabinet of the cooler, and then sequentially connected to the first to fourth groups of the switch cabinets of the cooler in a "jumper" manner. The second direct-current power supply is firstly connected into the fourth group of cooler switch cabinets, is opposite to the wiring direction of the first direct-current power supply, and is finally connected into the cooler PLC control cabinet.
The flow chart of the system is shown in fig. 6, when the control system is started, the control modes (automatic and manual) selection knobs A01CC, B01CC and C01CC of the four cooler control cabinets are firstly marked at the middle positions. After the two paths of alternating current power supplies and the direct current power supplies are powered on, the fact that a human-computer interaction interface (HMI) does not have alarm information is confirmed, and then a control mode is selected, so that the operation and the stop of the cooler are controlled.
Claims (5)
1. The utility model provides an oil-immersed transformer cooler control system which characterized in that: the system comprises four cooler switch cabinets and a cooler PLC control cabinet, wherein the four cooler switch cabinets are respectively connected with the cooler PLC control cabinet;
the four cooler switch cabinets comprise a first group of cooler switch cabinets, a second group of cooler switch cabinets, a third group of cooler switch cabinets and a fourth group of cooler switch cabinets;
the first group of cooler switch cabinets, the second group of cooler switch cabinets, the third group of cooler switch cabinets and the fourth group of cooler switch cabinets are not in communication connection;
the oil pump and fan state signals of the first group of cooler switch cabinets, the second group of cooler switch cabinets, the third group of cooler switch cabinets and the fourth group of cooler switch cabinets are fed back to the PLC in the cooler PLC control cabinet through the respective cooler switch cabinets;
PLC in the cooler PLC control cabinet controls the operation and stop of the main transformer ABC three-phase cooler by controlling intermediate relays A01XR in the four cooler switch cabinets.
2. The oil filled transformer chiller control system of claim 1, wherein: the power supply also comprises two paths of direct current power supplies.
3. The oil filled transformer chiller control system of claim 2, wherein: the two DC power supplies comprise a first DC power supply and a second DC power supply.
4. An oil filled transformer chiller control system as claimed in claim 3 wherein: the first direct current power supply is connected to the PLC control cabinet of the cooler and is sequentially connected to the first group to the fourth group of cooler switch cabinets in a jumper mode.
5. An oil filled transformer chiller control system as claimed in claim 3 wherein: and the second direct current power supply is connected to the fourth group of cooler switch cabinets, is opposite to the first direct current wiring direction, and is connected to the cooler PLC control cabinet finally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221722633.XU CN218383722U (en) | 2022-07-04 | 2022-07-04 | Oil-immersed transformer cooler control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221722633.XU CN218383722U (en) | 2022-07-04 | 2022-07-04 | Oil-immersed transformer cooler control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218383722U true CN218383722U (en) | 2023-01-24 |
Family
ID=84960579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221722633.XU Active CN218383722U (en) | 2022-07-04 | 2022-07-04 | Oil-immersed transformer cooler control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218383722U (en) |
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2022
- 2022-07-04 CN CN202221722633.XU patent/CN218383722U/en active Active
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