Excitation system of resistance-capacitance loop
By using dual thyristor rectifiers and excitation regulators, layered parallel resistor structures and sensor monitoring in the excitation system, the problem of connection point detachment in the RC circuit under high temperature is solved, and stable operation and fault reduction of the excitation system are achieved.
Patent Information
- Application Number
- CN202422944759.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The problem of connection point detachment in the existing RC circuit under high temperature conditions leads to instability of the excitation system and poses a risk of short circuit tripping.
It adopts a dual thyristor rectifier and a dual excitation regulator. The parallel resistors on the positive and negative sides are spaced at a preset distance and connected by high-temperature soldering. Combined with a multi-layer RC circuit structure and sensor monitoring, it disperses energy absorption and current path, reducing local overheating.
This improves the stability and reliability of the excitation system, reduces the risk of failure, and ensures the normal operation of the RC circuit and equipment safety.
Smart Images
Figure CN223462949U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of power equipment, especially relates to a resistance and capacitance loop's excitation system. BACKGROUND
[0002] The synchronous condenser is a kind of special "generator", and active power that it absorbs from power grid only supplies the loss of motor itself, and it operates in the case of near zero electromagnetic power and zero power factor, does not send active power, only " sends " reactive power.Excitation system is generally composed of excitation power unit and excitation regulator two main parts, and excitation power unit provides excitation current to synchronous generator rotor, and excitation regulator controls the output of excitation power unit according to input signal and given regulation criterion, and it is the device for providing magnetic field current for synchronous motor.
[0003] In excitation system, overvoltage peak burr is generated in the moment of thyristor commutation, which can influence excitation transformer and synchronous condenser insulation performance and destroy the normal operation state of thyristor.To guarantee the stable operation of excitation system, resistance and capacitance loop can absorb the energy generated by commutation overvoltage.
[0004] In the related technology, the upper end of the resistance of resistance and capacitance loop is connected with resistance parallel copper bar and diode cable, and each element is concentrated in this point and welded, so that the welding contact surface of each conductor is unbalanced, and the welding reliability is reduced.Furthermore, the resistance and capacitance loop is overheated too fast, and obvious heating phenomenon occurs.In long-term high-temperature state, the wire connection point can fall off, and there is the risk of short-circuit tripping, which threatens the stable operation of excitation system.
[0005] Therefore, how to avoid the problem of connection point falling off caused by high temperature in resistance and capacitance loop and improve the stability of excitation system is the key problem of the person skilled in the art. UTILITY MODEL CONTENT
[0006] To solve the problems in the prior art, the utility model provides a resistance and capacitance loop's excitation system, which solves the problem of connection point falling off caused by high temperature in resistance and capacitance loop and improves the stability of excitation system.
[0007] To achieve the purpose of the utility model, the utility model adopts the following technical scheme: a resistance and capacitance loop's excitation system, comprising:
[0008] Power supply, starting transformer, first silicon controlled rectifier device, second silicon controlled rectifier device, first excitation regulator, second excitation regulator, first de-excitation switch, second de-excitation switch, collector ring, synchronous condenser, excitation transformer;
[0009] The power supply is connected to the starting transformer, the starting transformer is connected to the first thyristor rectifier device, the first thyristor rectifier device is connected to the first excitation regulator, the first thyristor rectifier device is connected to the synchronous phase modifier through the first de-excitation switch and the collector ring, the synchronous phase modifier is connected to the excitation transformer, the excitation transformer is connected to the second thyristor rectifier device, the second thyristor rectifier device is connected to the second excitation regulator, and the second thyristor rectifier device is connected to the collector ring through the second de-excitation switch.
[0010] The first thyristor rectifier device and the second thyristor rectifier device each comprise a thyristor and a resistance-capacitance circuit, the resistance-capacitance circuit comprises a positive side parallel resistor and a negative side parallel resistor, and each resistor in the positive side parallel resistor and the negative side parallel resistor is spaced apart by a preset distance.
[0011] Optionally, the top end of the positive side parallel resistor is connected through a positive copper rod, one end of the positive copper rod exceeds the top end of the positive side parallel resistor, and the end of the positive copper rod exceeding the top end is connected to a first resistance lead wire and a positive lead wire according to a preset interval.
[0012] Optionally, the top end of the negative side parallel resistor is connected through a negative copper rod, one end of the negative copper rod exceeds the top end of the negative side parallel resistor, and the end of the negative copper rod exceeding the top end is connected to a second resistance lead wire and a negative lead wire according to a preset interval.
[0013] Optionally, the positive copper rod is welded between the positive side parallel resistor, the first resistance lead wire and the positive lead wire through high-temperature tin soldering, and the negative copper rod is welded between the negative side parallel resistor, the second resistance lead wire and the negative lead wire through high-temperature tin soldering.
[0014] Optionally, the resistance-capacitance circuit further comprises a voltage sensor, a capacitance sensor and a temperature sensor, the voltage sensor is used for monitoring the voltage of the resistance-capacitance circuit in real time, the capacitance sensor is used for monitoring the capacitance of the resistance-capacitance circuit in real time, and the temperature sensor is used for monitoring the temperature of the resistance-capacitance circuit in real time.
[0015] Optionally, the resistance-capacitance circuit is a multilayer resistance-capacitance circuit structure, and the positive side parallel resistor and the negative side parallel resistor are arranged according to a layered structure and are separated by an insulating layer in each layer.
[0016] Compared with the prior art, the utility model has the following beneficial effects:
[0017] The system stability is improved through the double thyristor rectifier device, the double excitation regulator and the related connection mode, and the positive side and the negative side parallel resistance interval preset distance improves the performance of the resistance-capacitance circuit, so that the energy absorption is more uniform, the local overheating is reduced, the normal operation of the circuit is helped, and the fault risk is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 A structure diagram of an excitation system of a resistance-capacitance circuit provided by the embodiment of the application is provided.
[0019] Figure 2 A schematic diagram of a resistance-capacitance circuit of an excitation system of a resistance-capacitance circuit provided by the embodiment of the application is provided.
[0020] In the figure: power supply 1, starting transformer 2, first thyristor rectifier device 31, second thyristor rectifier device 32, first excitation regulator 41, second excitation regulator 42, first de-excitation switch 51, second de-excitation switch 52, collector ring 6, synchronous phase modifier 7, excitation transformer 8, negative side parallel resistance 9, positive side parallel resistance 10, second resistance wire 11, negative pole wire 12, first resistance wire 13, positive pole wire 14, negative pole copper bar 15, positive pole copper bar 16. DETAILED DESCRIPTION
[0021] To solve the problems in the prior art, the utility model provides a kind of excitation system of resistance-capacitance circuit, and the device solves the connection point drop-out problem caused by high temperature state in resistance-capacitance circuit, improves the stability of excitation system.
[0022] The technical scheme of the utility model embodiment will be clearly and completely described below with reference to the drawings in the utility model embodiment:
[0023] Please refer to Figure 1 , Figure 1 A structure diagram of an excitation system of a resistance-capacitance circuit provided by the embodiment of the application is provided.
[0024] Please refer to Figure 2 , Figure 2 A schematic diagram of a resistance-capacitance circuit of an excitation system of a resistance-capacitance circuit provided by the embodiment of the application is provided.
[0025] In the embodiment, the system can include:
[0026] Power supply 1, starting transformer 2, first thyristor rectifier device 31, second thyristor rectifier device 32, first excitation regulator 41, second excitation regulator 42, first de-excitation switch 51, second de-excitation switch 52, collector ring 6, synchronous phase modifier 7, excitation transformer 8;
[0027] The power supply 1 is connected to the starting transformer 2, the starting transformer 2 is connected to the first thyristor rectifier device 31, the first thyristor rectifier device 31 is connected to the first excitation regulator 41, the first thyristor rectifier device 31 is connected to the synchronous phase modifier 7 through the first de-excitation switch 51 and the collector ring 6, the synchronous phase modifier 7 is connected to the excitation transformer 8, the excitation transformer 8 is connected to the second thyristor rectifier device 32, the second thyristor rectifier device 32 is connected to the second excitation regulator 42, and the second thyristor rectifier device 32 is connected to the collector ring 6 through the second de-excitation switch 52.
[0028] The first thyristor rectifier device 31 and the second thyristor rectifier device 32 each include a thyristor and a resistance-capacitance circuit, the resistance-capacitance circuit includes a positive side parallel resistance 10 and a negative side parallel resistance 9, and each resistance in the positive side parallel resistance 10 and the negative side parallel resistance 9 is spaced apart by a preset distance.
[0029] The first thyristor rectifier device 31 and the second thyristor rectifier device 32 each include a thyristor and a resistance-capacitance circuit, the resistance-capacitance circuit includes a positive side parallel resistance 10 and a negative side parallel resistance 9, and each resistance in the positive side parallel resistance 10 and the negative side parallel resistance 9 is spaced apart by a preset distance. In the excitation system, an overvoltage spike burr is generated at the moment of the thyristor commutation. The resistance-capacitance circuit is used to absorb the energy generated by the overvoltage commutation, so as to ensure the stable operation of the excitation system. By setting the positive side parallel resistance 10 and the negative side parallel resistance 9 to be spaced apart by a preset distance, the energy absorption can be better dispersed, and problems such as local overheating can be avoided.
[0030] Due to the adoption of the double thyristor rectifier devices and the double excitation regulators and the related connection mode, the excitation control of the synchronous phase modifier 7 is more accurate and stable. For example, under different working conditions, the output can be better adjusted through the first and second thyristor rectifier devices 32 and the corresponding excitation regulators, so as to ensure the stable operation of the synchronous phase modifier 7. The single thyristor rectifier device and excitation regulator structure may have better adaptability under certain complex working conditions.
[0031] In addition, each resistance in the positive side parallel resistance 10 and the negative side parallel resistance 9 is spaced apart by a preset distance, so that the resistance-capacitance circuit is more uniform when absorbing overvoltage energy, and the possibility of local overheating is reduced. The welding points of the resistance terminals are dispersed, which helps the resistance-capacitance circuit to recover to normal, no obvious heating phenomenon occurs, the possibility of circuit solder melting is reduced, and the possibility of discharge or even equipment short-circuit trip after melting is greatly reduced.
[0032] As can be seen, in the embodiment, the system stability is improved by the double thyristor rectifier devices and the double excitation regulators and the related connection mode, and the positive side parallel resistance 10 and the negative side parallel resistance 9 are spaced apart by a preset distance to improve the performance of the resistance-capacitance circuit, so that the energy absorption is more uniform, the local overheating is reduced, the circuit normal operation is facilitated, and the fault risk is reduced.
[0033] Optionally, the top end of the positive side parallel resistance 10 is connected through a positive copper rod 16, one end of the positive copper rod 16 exceeds the top end of the positive side parallel resistance 10, and the exceeding end of the positive copper rod 16 is connected to the first resistance wire 13 and the positive wire 14 at a preset interval.
[0034] The top end of the positive side parallel resistance 10 is connected through a positive copper rod 16, and one end of the positive copper rod 16 exceeds the top end of the positive side parallel resistance 10, and the exceeding end is connected to the first resistance wire 13 and the positive wire 14 at a preset interval. By extending and connecting at intervals, the current path can be dispersed, the local overheating problem caused by current concentration can be reduced, and the welding operation is also facilitated, ensuring the reliability of the connection.
[0035] Dispersing the current path can avoid the concentration of current at one point, thereby reducing the possibility of local overheating of the resistance end, further protecting the normal operation of the resistance-capacitance circuit, and reducing the risk of solder melting, equipment short-circuit tripping and the like caused by overheating.
[0036] Optionally, the top end of the negative side parallel resistance 9 is connected through a negative copper rod 15, one end of the negative copper rod 15 exceeds the top end of the negative side parallel resistance 9, and the exceeding end of the negative copper rod 15 is connected to the second resistance wire 11 and the negative wire 12 at a preset interval.
[0037] The top end of the negative side parallel resistance 9 is connected through a negative copper rod 15, one end of the negative copper rod 15 exceeds the top end of the negative side parallel resistance 9, and the exceeding end is connected to the second resistance wire 11 and the negative wire 12 at a preset interval. This is to achieve the dispersion of the current path and the reliability of the connection on the negative side, cooperate with the design of the positive side of the entire resistance-capacitance circuit, and ensure the normal operation of the circuit. The current path can be dispersed on the negative side, the local overheating risk can be reduced, the stability and reliability of the resistance-capacitance circuit can be further protected, and the possibility of equipment failure can be reduced.
[0038] Optionally, the positive copper rod 16 is welded between the positive side parallel resistance 10, the first resistance wire 13, and the positive wire 14 by high-temperature tin soldering; and the negative copper rod 15 is welded between the negative side parallel resistance 9, the second resistance wire 11, and the negative wire 12 by high-temperature tin soldering.
[0039] The positive copper rod 16 is welded between the positive side parallel resistance 10, the first resistance wire 13, and the positive wire 14 by high-temperature tin soldering, and the negative copper rod 15 is welded between the negative side parallel resistance 9, the second resistance wire 11, and the negative wire 12 by high-temperature tin soldering. This welding method is to ensure good electrical connection between the components, and high-temperature tin soldering has certain strength and conductivity, which can meet the requirements of circuit operation.
[0040] The reliable connection between the components ensures that the current can be stably transmitted in the loop, which, in combination with the design of the current path dispersion and the reduction of local overheating in the preceding claims, guarantees the normal operation of the resistance-capacitance loop and reduces the risk of circuit failure caused by poor connection.
[0041] Optionally, the resistance-capacitance loop further comprises a voltage sensor, a capacitance sensor, and a temperature sensor. The voltage sensor is used to monitor the voltage of the resistance-capacitance loop in real time, the capacitance sensor is used to monitor the capacitance of the resistance-capacitance loop in real time, and the temperature sensor is used to monitor the temperature of the resistance-capacitance loop in real time.
[0042] The sensors are set to obtain the operating parameters of the resistance-capacitance loop in real time, so as to timely discover possible problems of the loop, such as voltage abnormalities, capacitance changes, temperature rises, etc.
[0043] Through real-time monitoring, the operating state of the resistance-capacitance loop can be timely grasped, and measures can be taken in time when abnormal conditions occur, such as adjusting circuit parameters, giving fault warnings, etc., thereby improving the safety and reliability of the system and further guaranteeing the stable operation of the excitation system.
[0044] Optionally, the structure of the resistance-capacitance loop is a multi-layer resistance-capacitance loop structure, wherein the positive side parallel resistance 10 and the negative side parallel resistance 9 are arranged in a layered structure, and each layer is separated by an insulating layer.
[0045] The structure of the resistance-capacitance loop is a multi-layer resistance-capacitance loop structure, wherein the positive side parallel resistance 10 and the negative side parallel resistance 9 are arranged in a layered structure, and each layer is separated by an insulating layer. This multi-layer structure can further improve the performance of the resistance-capacitance loop, and by arranging the resistors and insulating layers in layers, the electric field distribution can be better controlled, the interlayer interference can be reduced, and the voltage withstand capability of the resistance-capacitance loop can be increased.
[0046] The voltage withstand capability and anti-interference capability of the resistance-capacitance loop are improved, so that the resistance-capacitance loop can better operate in a complex electromagnetic environment, reduce failures caused by electric field interference and insufficient voltage withstand, and further guarantee the stable operation of the excitation system.
[0047] Optionally, the power supply 1 is connected to the silicon controlled rectifier device through the starting transformer 2. After the silicon controlled rectifier device is rectified to direct current, it is connected to the collector ring 6 of the synchronous condenser 7 through the de-excitation switch. The excitation regulator controls the output of the silicon controlled rectifier device according to the input signal and the given regulation law, and controls the output voltage and reactive power of the synchronous condenser 7.
[0048] The above merely describes a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art, according to the technical scheme and improvement concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. An excitation system of a resistor-capacitor circuit, characterized by, The application relates to a power supply, a starting transformer, a first thyristor rectifier device, a second thyristor rectifier device, a first excitation regulator, a second excitation regulator, a collector ring, a synchronous phase modifier and an excitation transformer. The power supply is connected with the starting transformer, the starting transformer is connected with the first thyristor rectifier device, the first thyristor rectifier device is connected with the first excitation regulator, the first thyristor rectifier device is connected with the synchronous phase modifier through the first excitation switch and the collector ring, the synchronous phase modifier is connected with the excitation transformer, the excitation transformer is connected with the second thyristor rectifier device, the second thyristor rectifier device is connected with the second excitation regulator, and the second thyristor rectifier device is connected with the collector ring through the second excitation switch. The first thyristor rectifier device and the second thyristor rectifier device each comprise a thyristor and a resistance-capacitance circuit, the resistance-capacitance circuit comprises a positive side parallel resistance and a negative side parallel resistance, and each resistance in the positive side parallel resistance and the negative side parallel resistance is spaced apart by a preset distance. The top end of the positive side parallel resistance is connected with a positive copper rod, one end of the positive copper rod exceeds the top end of the positive side parallel resistance, and the end of the positive copper rod exceeding the top end is connected with a first resistance wire and a positive wire according to a preset interval.
2. The field system of claim 1, wherein, The top end of the negative side parallel resistance is connected with a negative copper rod, one end of the negative copper rod exceeds the top end of the negative side parallel resistance, and the end of the negative copper rod exceeding the top end is connected with a second resistance wire and a negative wire according to a preset interval.
3. The field system of claim 2, wherein, The positive copper rod is welded with the positive side parallel resistance, the first resistance wire and the positive wire through high-temperature tin soldering; and the negative copper rod is welded with the negative side parallel resistance, the second resistance wire and the negative wire through high-temperature tin soldering.
4. The field system of claim 3, wherein, The resistance-capacitance circuit further comprises a voltage sensor, a capacitance sensor and a temperature sensor, the voltage sensor is used for monitoring the voltage of the resistance-capacitance circuit in real time, the capacitance sensor is used for monitoring the capacitance of the resistance-capacitance circuit in real time, and the temperature sensor is used for monitoring the temperature of the resistance-capacitance circuit in real time.
5. The field system of claim 4, wherein, The resistance-capacitance circuit is a multilayer resistance-capacitance circuit structure, and the positive side parallel resistance and the negative side parallel resistance are arranged according to a layered structure and are separated by an insulating layer in each layer.
6. The excitation system of claim 5, wherein