CN207530608U - The device that forced oil-circulation air-cooled transformer cooler is thrown by force - Google Patents

Abstract

The utility model relates to a device for forced oil circulation air-cooled transformer cooler. The power input end of the main power switch is connected to the three-phase power supply of the third air-cooled control cabinet cooler, and the power output end of the main power switch is connected to the The power input end of the main switch in the cabinet, the first power inlet end of the dual power switch is connected to the power supply of the air-cooled control cabinet cooler power module of the air-cooled control cabinet, the second power inlet of the dual power switch Connect the power output end of the main switch in the cabinet, the power outlet end of the dual power switch is connected to the load power bus, one end of the branch power switch is connected to the load power bus, and the other end of the branch power switch is connected to the dual power supply manual selection The first power inlet end of the device and the second power inlet end of the dual-way power manual selection device are connected to one end of the temperature control contactor in the cooler power module of the air-cooled control cabinet. The utility model has the advantages of less equipment investment, high power supply reliability and flexible power supply.

Description

Forced Oil Circulation Air-cooled Transformer Cooler Forced Casting Device

technical field

The utility model relates to the technical field of electric power equipment, in particular to a device for forced oil circulation of an air-cooled transformer cooler.

Background technique

Transformer (reactor) is the most critical electrical equipment in substation (converter station). During operation, there is heat due to copper loss and iron loss, and the temperature rise directly affects the life of its insulating material. Therefore, large-scale charging such as transformer (reactor) Oil equipment must be cooled during operation. At present, the cooling method of forced oil circulation and air cooling is mainly used in 220kV and above substations (converter stations). The cooling system is mainly composed of heat exchanger, submersible pump, cooling fan, current transformer, temperature sensor, oil flow relay, control device and so on. Among them, the cooler composed of the submersible oil pump and the cooling fan is selected by the switching device as the power supply from two main power sources, so as to improve the power supply reliability of the cooler. After the two power sources of the transformer (reactor) are selected by the switching control device, The contact relay corresponding to one of the two incoming power supplies is controlled to absorb and cooperate as the power supply for each group of coolers. However, there are the following problems in actual use: (1) When the power switching device of the two power supply lines fails or the contact relay corresponding to the two power supply lines fails, it will cause the two power supply lines to be unable to be selected and all coolers will appear. In case of loss of power supply. If the temperature of the transformer (reactor) continues to rise, it may cause protection action and affect the system power supply; (2) When the system is running normally, the start and stop of the cooler is controlled by an external signal. When a control circuit failure occurs during operation (loss of control signal power supply, controller failure, etc.), it will cause the cooler to fail to operate normally and affect the heat dissipation of the transformer. If the temperature of the transformer (reactor) continues to rise, it may cause protection action and affect the power supply of the system.

Utility model content

The purpose of the utility model is to provide a device for forced oil circulation air-cooled transformer cooler, which requires less equipment, low cost, high power supply reliability, flexible power supply and good safety, and can be widely popularized.

In order to solve the above technical problems, the utility model discloses a device for forced oil circulation air-cooled transformer cooler, which includes a power supply module for the cooler of the air-cooled control cabinet, and is characterized in that it also includes a cooler for the cooler The power supply cabinet, the forced power supply cabinet for cooler air-cooled equipment includes a main power switch, a main switch in the cabinet, a dual power supply switch, a load power bus, a branch power switch and a manual selection device for a dual power supply, wherein the power supply The power input end of the main switch is connected to the third three-phase power supply of the cooler of the air-cooled control cabinet, the power output end of the main power switch is connected to the power input end of the main switch in the cabinet, and the first power input end of the dual-way power switch is connected to the air-cooled control cabinet. The air-cooled control cabinet cooler power supply for the cooler power module of the cold control cabinet, the second power input terminal of the dual power switch is connected to the power output terminal of the main switch in the cabinet, and the power outlet terminal of the dual power switch is connected to the load Power bus, one end of the branch power switch is connected to the load power bus, the other end of the branch power switch is connected to the first power inlet end of the dual power manual selection device, and the second power inlet end of the dual power manual selection device Connect one end of the temperature control contactor in the cooler power module of the air-cooled control cabinet, and the power outlet end of the dual power manual selection device is used to connect the power supply end of the submersible oil pump or cooling fan motor.

The utility model has the following advantages due to the adoption of the above technical characteristics:

1. Added a third air-cooled control cabinet cooler three-phase power supply, which is independent of the original power supply and improves power supply reliability;

2. A strong input device is added, and the power supply of each load in the forced input circuit can be selected from the original power circuit and the three-phase power supply of the third air-cooled control cabinet cooler, which improves the flexibility of power supply;

3. A single-pole, double-throw dual-circuit power supply manual selection device is added between the load, the main circuit power supply, and the strong-throw power supply, which can effectively prevent non-synchronous closing and ensure the safety of power supply. Moreover, the utility model has the advantages of simple structure, low input cost, simple equipment operation, high feasibility, obvious economic benefit, safety and reliability, and easy popularization.

Description of drawings

Fig. 1 is a schematic diagram of the circuit structure of the utility model.

Among them, 1—air-cooled control cabinet cooler power module, 1.1—the first three-phase power supply of the air-cooled control cabinet cooler, 1.2—the second air-cooled control cabinet cooler three-phase power supply, 1.3—the first power supply contact Relay, 1.4—the second power supply contact relay, 1.5—power switching controller, 1.6—cooler power switch, 1.7—temperature control contactor, 2—cooler air-cooled equipment strong power supply cabinet, 3—power main switch, 4—Main switch in the cabinet, 5—Dual power supply switch, 6—Voltage switching display device, 7—Load power bus, 8—Branch power switch, 9—Dual power supply manual selection device, 10—Third wind Cold control cabinet cooler three-phase power supply.

Detailed ways

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

A device for forced oil circulation air-cooled transformer cooler of the utility model, as shown in Fig. The power supply cabinet 2, the cooler air-cooled equipment forced power supply cabinet 2 includes a main power switch 3, a main switch in the cabinet 4, a dual power supply switch 5, a load power bus 7, a branch power switch 8 and a dual power supply Manual selection device 9, wherein, the power input end of the main power switch 3 is connected to the three-phase power supply 10 of the third air-cooled control cabinet cooler, and the power output end of the main power switch 3 is connected to the power input end of the main switch 4 in the cabinet. The first power inlet end of the one-way power switch 5 is connected to the power supply of the air-cooled control cabinet cooler power module 1, and the second power inlet end of the two-way power switch 5 is connected to the main switch 4 in the cabinet The power output terminal of the dual power switch 5 is connected to the load power bus 7, one end of the branch power switch 8 is connected to the load power bus 7, and the other end of the branch power switch 8 is connected to the dual power manual selection device The first power inlet end of 9, the second power inlet end of the dual power supply manual selection device 9 is connected to one end of the temperature control contactor 1.7 in the cooler power module 1 of the air-cooled control cabinet, and the dual power supply manual selection device 9 The outlet end of the power supply is used to connect the power supply end of the submersible pump or cooling fan motor.

The above-mentioned dual power supply switching switch 5 and the dual power supply manual selection device 9 isolate the forced power supply from the main power supply to ensure that the main circuit power supply can be completely disconnected when the forced power supply is switched on to prevent non-synchronous closing.

In the above technical solution, the air-cooled control cabinet cooler power module 1 includes a power switching controller 1.5, a cooler power switch 1.6, a temperature control contactor 1.7, a first air-cooled control cabinet cooler three-phase power supply 1.1, a second The two-way air-cooled control cabinet cooler three-phase power supply 1.2, the first-way power supply contact relay 1.3, the second-way power supply contact relay 1.4, the first-way air-cooled control cabinet cooler three-phase power supply 1.1 is connected to the first-way power supply contact The power input terminal of the relay 1.3, the three-phase power supply 1.2 of the second air-cooled control cabinet cooler is connected to the power input terminal of the second power supply contact relay 1.4, and the power output terminal of the first power supply contact relay 1.3 is in contact with the second power supply The power output terminal of relay 1.4 is connected to form the power supply for the cooler of the air-cooled control cabinet;

The voltage measurement terminals of the power switching controller 1.5 are respectively connected to the three-phase power supply 1.1 of the first air-cooled control cabinet cooler and the three-phase power supply 1.2 of the second air-cooled control cabinet cooler, and the power switching controller 1.5 The first relay control signal output terminal is connected to the control terminal of the first power supply contact relay 1.3, the second relay control signal output terminal of the power switching controller 1.5 is connected to the control terminal of the second power supply contact relay 1.4, and the cooler power switch One end of 1.6 is connected to the power supply of the cooler of the air-cooled control cabinet, and the other end of the cooler power switch 1.6 is connected to the other end of the temperature control contactor 1.7.

In the above technical solution, the temperature control contactor 1.7 is controlled by the programmable logic controller according to the temperature signal collected by the programmable logic controller. When the programmable controller detects that the winding temperature of the transformer (reactor) is higher than the set value, the corresponding cooler (submersible oil pump, cooling fan) is put into operation; when it detects that the oil temperature of the transformer (reactor) body is lower than the set value Exit the corresponding cooler (submersible oil pump, cooling fan) when the value is set.

In the above technical solution, a voltage switching display device 6 is connected in parallel on the line between the power outlet end of the dual power supply switch 5 and the load power bus 7 . The voltage switching display device 6 installed in parallel on the bus is used to check and monitor the power supply of the forced throw circuit.

The first air-cooled control cabinet cooler three-phase power supply 1.1, the second air-cooled control cabinet cooler three-phase power supply 1.2 and the third air-cooled control cabinet cooler three-phase power supply 10 are all 400V three-phase AC power supplies .

In the above technical solution, the main power switch 3 is used to switch the three-phase power supply 10 of the cooler of the third-way air-cooled control cabinet, and the main switch 4 in the cabinet is used to control the power supply cabinet 2 and the third-way air-cooled control cabinet of the cooler. Control cabinet cooler three-phase power supply 10 connection.

In the above technical solution, the power switching controller 1.5 is used to control the first power contact relay 1.3 or the second power contact relay 1.4 to be turned on.

A forced oil circulation air-cooled transformer cooler forced throwing method utilizing the above-mentioned device is characterized in that it comprises the following steps:

Step 1: In the initial state, the power switching controller 1.5 controls and controls the first power contact relay 1.3 or the second power contact relay 1.4 to be connected. In the initial state, when the first power contact relay 1.3 is connected, the second The power supply contact relay 1.4 is disconnected. At this time, the three-phase power supply 1.1 of the first air-cooled control cabinet cooler supplies power to the submersible oil pump or the cooling fan motor through the cooler power switch 1.6 and the temperature control contactor 1.7 (at this time, the two-way power supply is manually The selection device 9 makes the temperature control contactor 1.7 connected to the power supply end of the submersible oil pump or the cooling fan motor), and the voltage measuring end of the power switching controller 1.5 monitors the first road air-cooled control cabinet cooler three-phase power supply 1.1 in real time, when monitoring When the three-phase power supply 1.1 of the first air-cooled control cabinet cooler has an open circuit or short circuit fault and causes an abnormal voltage of the incoming power supply, the power switching controller 1.5 controls the first power supply contact relay 1.3 to disconnect, and the second power supply contact relay 1.4 Connected, at this time, the three-phase power supply 1.2 of the second air-cooled control cabinet cooler supplies power to the submersible oil pump or the cooling fan motor through the cooler power switch 1.6 and the temperature control contactor 1.7;

In the initial state, when the second road power contact relay 1.4 was connected, and the first road power contact relay 1.3 was disconnected, at this moment, the second road power contact relay 1.4 supplies power to the submersible oil pump or the cooling fan motor (two-way power supply at this time) The power supply manual selection device 9 makes the temperature control contactor 1.7 connected with the power supply terminal of the submersible oil pump or the cooling fan motor), and the voltage measurement terminal of the power switching controller 1.5 monitors the three-phase power supply 1.2 of the second road air-cooled control cabinet cooler in real time, When it is detected that the three-phase power supply 1.2 of the second air-cooled control cabinet cooler has an open circuit or a short circuit fault that causes an abnormal voltage of the incoming power supply, the power switch controller 1.5 controls the second power supply contact relay 1.4 to disconnect, and the first power supply contact relay 1.4 is disconnected. The relay 1.3 is switched on, and at this time, the three-phase power supply 1.1 of the first air-cooled control cabinet cooler supplies power to the submersible oil pump or the cooling fan motor;

Step 2: When both the first three-phase power supply 1.1 of the air-cooled control cabinet cooler and the second three-phase power supply 1.2 of the air-cooled control cabinet cooler fail, or the first power supply contact relay 1.3 and the second power supply contact relay 1.4 When all failures occur, control the switching action of the dual power supply switching switch 5 and the dual power supply manual selection device 9, so that the third air-cooled control cabinet cooler three-phase power supply 10 is connected to the load power bus 7, submersible oil pump or cooling fan The power supply end of the motor is connected with the branch power switch 8, and the three-phase power supply 10 of the third air-cooled control cabinet cooler supplies power to the submersible oil pump or the cooling fan motor to realize the strong input of the cooler.

In the utility model, when the power switching devices of the first air-cooled control cabinet cooler three-phase power supply 1.1 and the second air-cooled control cabinet cooler three-phase power supply 1.2 fail or the contact relays corresponding to the two power supply incoming circuits fail, The third air-cooled control cabinet cooler three-phase power supply 10 strong input power supply, to prevent all coolers from losing power supply situation. It avoids the protection action that may be caused by the continuous rise of the temperature of the transformer (reactor).

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (6)

1. the device that a kind of forced oil-circulation air-cooled transformer cooler is thrown by force, it includes air-cooled control cabinet Cooler Power module (1), which is characterized in that it further includes cooler air cooler and throws power cabinet (2) by force, and the cooler air cooler throws by force power supply Cabinet (2) includes master switch (4), double loop power supply switching switch (5), load power busbar (7), branch in battery main switch (3), cabinet Power switch (8) and double loop power supply manually select device (9), wherein, the power input connection third road of battery main switch (3) Air-cooled control cabinet cooler three phase mains (10), the power supply of master switch (4) in the power output end connecting cabinet of battery main switch (3) Input terminal, (5) first power inleting terminal of double loop power supply switching switch connect the air-cooled of air-cooled control cabinet Cooler Power module (1) Switch board cooler power supply, the electricity of master switch (4) in the second source end of incoming cables connecting cabinet of double loop power supply switching switch (5) Source output terminal, the power outlet end connected load power source bus (7) of double loop power supply switching switch (5), branch power switch (8) One end access load power busbar (7), the other end connection double loop power supply of branch power switch (8) manually select device (9) First power inleting terminal, double loop power supply manually select the second source end of incoming cables connection air-cooled control cabinet cooler electricity of device (9) One end of temperature control contactor (1.7) in source module (1), double loop power supply manually select the power outlet end of device (9) for connecting Connect the feeder ear of oil-immersed pump or cooling fan motor.

2. the device that forced oil-circulation air-cooled transformer cooler according to claim 1 is thrown by force, it is characterised in that：It is described Air-cooled control cabinet Cooler Power module (1) connects including power source switching controller (1.5), Cooler Power switch (1.6), temperature control Tentaculum (1.7), first via air-cooled control cabinet cooler three phase mains (1.1), the second road air-cooled control cabinet cooler three phase mains (1.2), first via electrical power contacts relay (1.3), the second road electrical power contacts relay (1.4), the air-cooled control of the first via The power input of cabinet cooler three phase mains (1.1) connection first via electrical power contacts relay (1.3), the cold control of the second transportation work style Cabinet cooler three phase mains (1.2) connects the power input of the second road electrical power contacts relay (1.4), first via electrical power contacts The power output end of relay (1.3) connect to form air-cooled control with the power output end of the second road electrical power contacts relay (1.4) Cabinet cooler power supply processed；

The voltage measurement end of the power source switching controller (1.5) is respectively connected to first via air-cooled control cabinet cooler three phase mains (1.1) and the second road air-cooled control cabinet cooler three phase mains (1.2), the first relay of the power source switching controller (1.5) The control terminal of device control signal output connection first via electrical power contacts relay (1.3), the power source switching controller (1.5) The second relay control signal output terminal connect the control terminal of the second road electrical power contacts relay (1.4), Cooler Power opens The air-cooled control cabinet cooler power supply, the other end connection of Cooler Power switch (1.6) are accessed in the one end for closing (1.6) The other end of temperature control contactor (1.7).

3. the device that forced oil-circulation air-cooled transformer cooler according to claim 2 is thrown by force, it is characterised in that：It is described Temperature control contactor (1.7) is controlled by programmable logic controller (PLC) according to the temperature signal that programmable logic controller (PLC) acquires.

4. the device that forced oil-circulation air-cooled transformer cooler according to claim 2 is thrown by force, it is characterised in that：It is described It is aobvious that voltage switching is connected on circuit between the power outlet end of double loop power supply switching switch (5) and load power busbar (7) Showing device (6).

5. the device that forced oil-circulation air-cooled transformer cooler according to claim 2 is thrown by force, it is characterised in that：It is described First via air-cooled control cabinet cooler three phase mains (1.1), the second road air-cooled control cabinet cooler three phase mains (1.2) and third Road air-cooled control cabinet cooler three phase mains (10) is 400V three-phase alternating-current supplies.

6. the device that forced oil-circulation air-cooled transformer cooler according to claim 2 is thrown by force, it is characterised in that：It is described Power source switching controller (1.5) is for controlling first via electrical power contacts relay (1.3) or the second road electrical power contacts relay (1.4) it connects.