Excitation system protection device

Abstract

The utility model belongs to the technical field of excitation system protection cabinets, particularly relates to an excitation system protection device, and aims to realize more reliable control of a cooling fan and cabinet withdrawing signals of the excitation system protection device. Comprising a cabinet body, a cooling fan, a first temperature sensor, a second temperature sensor, a fan switch control module, an alarm module, a timing module, a regulator and a main control module, the cabinet body is provided with an air inlet and an air outlet, and a heat dissipation fan is arranged at the air outlet; the first temperature sensor is arranged at the air inlet, and the second temperature sensor is arranged at the air outlet; the first end of the fan switch control module, the first temperature sensor, the second temperature sensor, the alarm module, the timing module and the regulator are respectively connected to the main control module, the control end of the fan switch control module is connected to the cooling fan, and the regulator is connected with a generator excitation system. The temperature-based excitation system has the advantage that the cabinet withdrawing and heat dissipation are more reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of excitation system protection cabinets, in particular to an excitation system protection device. Background Art

[0002] The generator excitation system is the core control device of a synchronous generator. Its primary function is to generate a configurable DC current and deliver it to the generator's rotor windings. The power unit is a crucial component of the generator excitation system, responsible for converting AC power to DC and providing the excitation current to the generator. During operation, the thyristors and RC circuits generate significant heat. If this heat cannot be removed promptly, it will overheat and damage components. Therefore, the power cabinet requires a cooling system to maintain temperature.

[0003] A common cooling method is forced air cooling via cooling fans. A loss of the cooling system can cause abnormal temperature rise in the power cabinet, limiting the excitation regulator's ability to force excitation, impacting the excitation system's output and the generator's stable operation. Protection of the power cabinets in the pre-excitation system primarily involves shutting down the cabinets. Under normal circumstances, multiple power cabinets operate redundantly. When specific conditions are met, the excitation regulator determines and issues a shutdown command. However, there are no clear limits on when the fans should be activated.

[0004] Therefore, it is necessary to optimize the protection of the magnetic system to achieve more reliable control of its cooling fans and cabinet withdrawal signals. Utility Model Content

[0005] In view of the technical problems existing in the background technology, the utility model provides an excitation system protection device, which can achieve more reliable control of its cooling fan and cabinet withdrawal signal.

[0006] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0007] The utility model provides an excitation system protection device, which is arranged in the generator excitation system, and includes a cabinet, a heat dissipation fan, a first temperature sensor, a second temperature sensor, a fan switch control module, an alarm module, a timing module, a regulator and a main control module;

[0008] The cabinet is provided with an air inlet and an air outlet, and the heat dissipation fan is provided at the air outlet;

[0009] The first temperature sensor is arranged at the air inlet, and the second temperature sensor is arranged at the air outlet;

[0010] The first end of the fan switch control module, the first temperature sensor, the second temperature sensor, the alarm module, the timing module and the regulator are respectively connected to the main control module, the control end of the fan switch control module is connected to the heat dissipation fan, and the regulator is connected to the generator excitation system.

[0011] Preferably, the air inlet is arranged at the lower end of the cabinet, and the air outlet is arranged at the upper end of the cabinet.

[0012] Preferably, the heat dissipation fan is arranged inside the cabinet near the air outlet.

[0013] Preferably, the heat dissipation fan is a dual-fan device.

[0014] Preferably, the first temperature sensor and the second temperature sensor are PT100.

[0015] Preferably, the fan switch control module includes a switch signal receiving module and a switch signal output module;

[0016] The input end of the switch signal receiving module is connected to the main control module, the output end of the switch signal receiving module is connected to the input end of the switch signal output module, and the output end of the switch signal output module is the control end of the fan switch control module.

[0017] Preferably, the switch signal receiving module includes a plurality of resistors and transistors;

[0018] One end of the first resistor is connected to the main control module, the other end of the first resistor is connected to one end of the second resistor and the first end of the transistor, the second end of the transistor is grounded, and the third end of the transistor is connected to the input end of the switch signal output module.

[0019] Preferably, the switch signal output module includes a plurality of resistors, relays and diodes;

[0020] One end of the third resistor is connected to the third end of the transistor, the other end of the third resistor is connected to one end of the coil of the relay and the anode of the diode, the cathode of the diode is connected to one end of the fourth resistor, the other end of the fourth resistor and the other end of the coil of the relay are connected to a DC source, and the two ends of the contacts of the relay are connected between the power supply end of the cooling fan and the power supply.

[0021] Preferably, the timing module adopts a timer.

[0022] Preferably, the regulator is a dual-microcomputer three-channel regulator.

[0023] The utility model has the following advantages and beneficial effects:

[0024] The utility model can control the fan start-up and power system back-off of the generator excitation system, providing comprehensive protection and making the operation of the generator excitation system safer and more reliable.

[0025] The utility model can control the start-up of the fan and the operation of the power cabinet, so that the operating temperature of the power cabinet is always kept within the normal range, and the power cabinet is shut down under specific circumstances, which plays a role in protecting the power cabinet, making the excitation system run normally, and ensuring the stable operation of the power plant;

[0026] The electrical components of the control circuit of the utility model have low cost, easy circuit construction and high control reliability;

[0027] The utility model is easy to set up, low in cost, and has significant safety benefits, and has a high cost-effectiveness ratio and is easy to promote and implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of the excitation system protection device provided by the utility model;

[0029] Figure 2 This is a schematic diagram of the circuit structure of the excitation system protection device provided by the utility model;

[0030] Figure 3 This is a structural diagram of the fan switch control module provided by the utility model;

[0031] Icon: 101-air outlet, 102-cabinet, 103-air inlet, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, K1-relay, D1-diode, Q1-transistor. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0034] Example 1

[0035] The utility model provides an excitation system protection device, see Figure 1-Figure 2 , which is arranged in the generator excitation system, includes a cabinet 102, a heat dissipation fan, a first temperature sensor, a second temperature sensor, a fan switch control module, an alarm module, a timing module, a regulator and a main control module;

[0036] The cabinet 102 is provided with an air inlet 103 and an air outlet 101, and the heat dissipation fan is provided at the air outlet 101;

[0037] The first temperature sensor is disposed at the air inlet 103 , and the second temperature sensor is disposed at the air outlet 101 ;

[0038] The first end of the fan switch control module, the first temperature sensor, the second temperature sensor, the alarm module, the timing module and the regulator are respectively connected to the main control module, the control end of the fan switch control module is connected to the heat dissipation fan, and the regulator is connected to the generator excitation system.

[0039] In this embodiment, the air inlet 103 is provided at the lower end of the cabinet 102 , and the air outlet 101 is provided at the upper end of the cabinet 102 .

[0040] On the other hand, the heat dissipation fan is arranged inside the cabinet 102 near the air outlet 101 .

[0041] Furthermore, the heat dissipation fan is a dual-fan device.

[0042] In this embodiment, the temperature is monitored by the first temperature sensor and the second temperature sensor. The main control module uses the temperature monitoring results and the timing module to judge the temperature condition, and then sends a control command to the fan switch control module to control the switch of the cooling fan and sends a signal to the regulator to control the cabinet withdrawal, that is, to block the power of the excitation system.

[0043] The following is a control case based on this embodiment:

[0044] Under normal circumstances, when the excitation system is in normal rectification operation, when the difference between the outlet air temperature and the inlet air temperature is greater than 25°C, that is, when the difference between the detection values of the second temperature sensor and the first temperature sensor is greater than 25°C, the fan switch control module controls the cooling fan to start; when the temperature is within the upper and lower limits of the sampling range, and any temperature of the outlet air temperature or the inlet air temperature is greater than 50°C, that is, when any detection value of the second temperature sensor and the first temperature sensor is greater than 50°C, the fan switch control module controls the cooling fan to start;

[0045] When the difference between the outlet air temperature and the inlet air temperature is greater than 30℃, that is, when the difference between the detection values of the second temperature sensor and the first temperature sensor is greater than 30℃, the timing module starts timing. If it drops below 30℃ again, the timing is stopped and the timer is reset. When the timer value reaches 60S, the regulator issues a cabinet exit signal and the alarm module can be activated to alarm. If the cooling fan does not start normally or the fan stops, the timing module starts timing. If the cooling fan starts normally or the fan stops, the timing is stopped and the timer is reset. When the timer value reaches 60S, the regulator issues a cabinet exit signal and the alarm module can be activated to alarm.

[0046] Example 2

[0047] This embodiment is based on the technical solution of Example 1 and further explains the relevant parts of the control circuit.

[0048] In this embodiment, the first temperature sensor and the second temperature sensor are PT100.

[0049] As a preferred solution of this embodiment, see Figure 3 , the fan switch control module includes a switch signal receiving module and a switch signal output module;

[0050] The input end of the switch signal receiving module is connected to the main control module, the output end of the switch signal receiving module is connected to the input end of the switch signal output module, and the output end of the switch signal output module is the control end of the fan switch control module.

[0051] Furthermore, the switch signal receiving module includes a plurality of resistors and a transistor Q1;

[0052] One end of the first resistor R1 is connected to the main control module, the other end of the first resistor R1 is connected to one end of the second resistor R2 and the first end of the transistor Q1, the second end of the transistor Q1 is grounded, and the other end of the second resistor R2 is grounded, and the third end of the transistor Q1 is connected to the input end of the switch signal output module.

[0053] On the other hand, the switch signal output module includes multiple resistors, a relay K1 and a diode D1;

[0054] One end of the third resistor R3 is connected to the third end of the transistor Q1, the other end of the third resistor R3 is connected to one end of the coil of the relay K1 and the anode of the diode D1, the cathode of the diode D1 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 and the other end of the coil of the relay K1 are connected to a DC source, and the two ends of the contacts of the relay K1 are connected between the power supply end of the cooling fan and the power supply.

[0055] During the actual construction, the transistor Q1 can be selected according to the situation. The transistor Q1 is turned on or off according to the high and low levels under the signal change of the main control module. For example, when a PNP transistor Q1 is used, the first end is the base, the second end is the emitter, and the third end is the collector; when the transistor Q1 is turned on, the coil of the relay K1 is energized, causing the change of the contacts of the relay K1. The contacts of the relay K1 can be normally open contacts, which are closed after the coil of the relay K1 is energized. At this time, the action of controlling the cooling fan to turn on is realized. On the contrary, after the transistor Q1 is disconnected, the coil of the relay K1 loses power and the contacts are opened. At this time, the action of controlling the cooling fan to turn off is realized.

[0056] In this embodiment, the timing module adopts a timer.

[0057] In addition, the regulator adopts a dual-microcomputer three-channel regulator.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An excitation system protection device, provided in the generator excitation system, characterized in that : including a cabinet, a heat dissipation fan, a first temperature sensor, a second temperature sensor, a fan switch control module, an alarm module, a timing module, a regulator and a main control module; The cabinet is provided with an air inlet and an air outlet, and the heat dissipation fan is provided at the air outlet; The first temperature sensor is arranged at the air inlet, and the second temperature sensor is arranged at the air outlet; The first end of the fan switch control module, the first temperature sensor, the second temperature sensor, the alarm module, the timing module and the regulator are respectively connected to the main control module, the control end of the fan switch control module is connected to the heat dissipation fan, and the regulator is connected to the generator excitation system; The air inlet is arranged at the lower end of the cabinet, and the air outlet is arranged at the upper end of the cabinet.

2. The excitation system protection device according to claim 1, characterized in that: The heat dissipation fan is arranged inside the cabinet near the air outlet.

3. The excitation system protection device according to claim 1, characterized in that: The heat dissipation fan is a dual-fan device.

4. The excitation system protection device according to claim 1, characterized in that: The first temperature sensor and the second temperature sensor are PT100.

5. The excitation system protection device according to claim 1, characterized in that: The fan switch control module includes a switch signal receiving module and a switch signal output module; The input end of the switch signal receiving module is connected to the main control module, the output end of the switch signal receiving module is connected to the input end of the switch signal output module, and the output end of the switch signal output module is the control end of the fan switch control module.

6. The excitation system protection device according to claim 5, characterized in that: The switch signal receiving module includes a plurality of resistors and transistors; One end of the first resistor is connected to the main control module, the other end of the first resistor is connected to one end of the second resistor and the first end of the transistor, the second end of the transistor is grounded, and the third end of the transistor is connected to the input end of the switch signal output module.

7. The excitation system protection device according to claim 6, characterized in that: The switch signal output module includes multiple resistors, relays and diodes; One end of the third resistor is connected to the third end of the transistor, the other end of the third resistor is connected to one end of the coil of the relay and the anode of the diode, the cathode of the diode is connected to one end of the fourth resistor, the other end of the fourth resistor and the other end of the coil of the relay are connected to a DC source, and the two ends of the contacts of the relay are connected between the power supply end of the cooling fan and the power supply.

8. The excitation system protection device according to claim 1, characterized in that: The timing module adopts a timer.

9. The excitation system protection device according to claim 1, characterized in that: The regulator adopts a dual-microcomputer three-channel regulator.

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