An intelligent power module used in steam turbine monitoring and protection instruments

Abstract

The present invention relates to an intelligent power supply module for a steam turbine monitoring and protection instrument. The module comprises an AC-DC conversion circuit, a switching circuit, an analog sampling circuit, an ADC analog-to-digital conversion circuit, a polling circuit, and a protection circuit. After 220VAC alternating current is input, it is converted into a ±24V direct current power supply by the AC-DC conversion circuit. The output end of the AC-DC conversion circuit is connected to the switching circuit, and the output end of the switching circuit is connected to the protection circuit. The direct current power supply is output after passing through the switching circuit and sent to a busbar of a TSI instrument monitor frame via the protection circuit to power a monitor module in the frame. The AC-DC conversion circuit is connected to the analog sampling circuit, and the output end of the analog sampling circuit is respectively connected to the protection circuit and the polling circuit. The output end of the polling circuit is connected to the ADC analog-to-digital conversion circuit. The present invention can be configured to be used in an independent power supply mode or in a redundant power supply mode, thereby improving the reliability of the power supply of the TSI instrument.

Description

[Technical field]

[0001] The invention belongs to the technical field of steam turbine monitoring and protection instruments, in particular to an intelligent power supply module used in steam turbine monitoring and protection instruments. [Background Technology]

[0002] Turbine Supervisory Instruments (TSIs) are key equipment for ensuring safe turbine operation. TSIs monitor and protect numerous parameters and signals, including vibration (including bearing vibration, relative vibration, and shaft vibration), axial displacement, differential expansion, eccentricity, speed, zero speed, key phase, cylinder expansion, hydraulic motor stroke, and synchronizer travel. Because each measurement parameter requires distinct measurement principles, the conversion of non-electrical quantities and the processing of electrical signals differ significantly. Depending on the measurement parameter type, the monitor module can be configured as a vibration monitor, axial displacement monitor, differential expansion monitor, eccentricity monitor, speed monitor, zero speed monitor, key phase monitor, cylinder expansion monitor, or travel monitor to monitor and protect vibration (including bearing vibration, relative vibration, and shaft vibration), axial displacement, differential expansion, eccentricity, speed, zero speed monitor, key phase monitor, cylinder expansion monitor, hydraulic motor stroke, and synchronizer travel.

[0003] The current standard practice is to centralize these parameter monitors within a single instrument frame, with power modules supplying power to each monitor module via the frame busbar. This complete TSI instrument consists of the monitor frame, frame busbar, power modules, monitor modules, and field sensors. Due to the limited stability of single-power supply systems, dual-power supply modules are used for redundant hot standby power supply to improve TSI instrument power reliability. Traditional hot standby power module redundancy typically uses a high-selection mode, where all monitor modules are powered by the power module with the higher output voltage. This redundant power supply approach can only handle partial failures caused by power failure in a single power module, as the load is borne by a single power module, resulting in inefficient load distribution. Power modules carrying loads are often prone to damage, while unloaded modules remain idle for extended periods. Furthermore, power modules lack warnings or have fixed warning points, making them difficult to modify. [Summary of the invention]

[0004] The purpose of the present invention is to address the above-mentioned deficiencies and provide an intelligent power supply module for use in a steam turbine monitoring and protection instrument. The intelligent power supply module can be configured to be used in an independent power supply mode or a redundant power supply mode, thereby improving the reliability of the power supply for the TSI instrument.

[0005] To achieve the above purpose, an intelligent power supply module for use in a steam turbine monitoring and protection instrument is designed, comprising an AC-DC conversion circuit 1, a switching circuit 2, an analog sampling circuit 3, an ADC analog-to-digital conversion circuit 5, a polling circuit 6, and a protection circuit 13. After the intelligent power supply module is connected to a 220VAC AC input, the AC-DC conversion circuit 1 converts the AC power into a ±24V DC power supply. The output end of the AC-DC conversion circuit 1 is connected to the switching circuit 2, the output end of the switching circuit 2 is connected to the protection circuit 13, and the input end of the AC-DC conversion circuit 1 is also connected to the protection circuit 13. The protection circuit 13 serves as a protection for signal output and input. The output end of the protection circuit 13 is connected to the busbar of the TSI instrument monitor frame. The DC power supply is output after passing through the switching circuit 2 and sent to the busbar of the TSI instrument monitor frame through the protection circuit 13, and powers the monitor module in the frame; the AC-DC conversion circuit 1 is connected to the analog sampling circuit 3, and the output end of the analog sampling circuit 3 is respectively connected to the protection circuit 13 and the polling circuit 6. The protection circuit 13 is connected to the polling circuit 6, and the output end of the polling circuit 6 is connected to the ADC analog-to-digital conversion circuit 5.

[0006] Furthermore, the voltage and current output by the AC-DC conversion circuit 1 are collected and regulated by the analog sampling circuit 3, and then output in two ways: one way is output in the form of an AO analog output 11, passes through the protection circuit 13, and is sent to another intelligent power module that is redundant with each other through the connector of the intelligent power module, and is sent to the polling circuit 6 of the other intelligent power module as an AI analog input; the other way is input into the polling circuit 6 and input into the ADC analog-to-digital conversion circuit 5. The voltage and current sampled by the other intelligent power module that is redundant with this power module are input into the polling circuit 6 in the form of an AI analog input 12.

[0007] Furthermore, the switching circuit 2 is composed of a power regulation and negative feedback circuit, and the switching circuit 2 is used to achieve redundant and controllable power output; the analog sampling circuit 3 is provided with a current sensor IC and a giant magnetoresistance GMR chip, and the analog sampling circuit 3 uses two current sensor ICs to sample current.

[0008] Furthermore, the intelligent power module is provided with a computing unit 4, which is composed of a CPU chip. The computing unit 4 is used to complete the control, calculation, analog input data collection, analog output, switch input, and switch output of each functional circuit of the intelligent power module.

[0009] Furthermore, the ADC analog-to-digital conversion circuit 5 is used to complete the sampling of the output voltage and current of the intelligent power module. The ADC analog-to-digital conversion circuit 5 adopts a programmable 16-bit high-speed SAR ADC, powered by a single power supply, and its reference source is integrated inside the ADC analog-to-digital conversion chip.

[0010] Furthermore, the polling circuit 6 has two inputs, one representing the voltage and current analog signals of the actual power consumption of the current intelligent power module, and the other representing the voltage and current analog signals of the actual power consumption of another intelligent power module that is redundant with the current intelligent power module. The polling circuit 6 switches the two analog input signals in turn under the control of the CPU and inputs them into the ADC analog-to-digital conversion circuit 5.

[0011] Furthermore, the intelligent power module is provided with a DI switch input circuit 7 and a DO switch output circuit 8. The DI switch input circuit 7 provides two dry node switch inputs for the intelligent power module, uses optocouplers for signal isolation, and its DI is used as a signal input for communicating with other modules; the DO switch output circuit 8 provides an electromagnetic relay output for the intelligent power module, the contact type is a dry node, and its DO is used as an alarm output of the voltage module.

[0012] Furthermore, the intelligent power module is provided with a CAN bus internal communication circuit 9 and an RS485 bus internal communication circuit 10. The CAN bus internal communication circuit 9 provides the intelligent power module with two CAN bus internal communication circuits, and the two CAN bus internal communication circuits serve as hot standby for each other; the RS485 bus internal communication circuit 10 provides the intelligent power module with an RS485 bus internal communication circuit for receiving configuration instructions for the intelligent power module and module configuration information.

[0013] Furthermore, the AO analog output 11 is taken from the analog sampling circuit 3, outputs the sampled voltage and sampled current, passes through the protection circuit 13 and the connector of the intelligent power module, and is sent to another redundant intelligent power module as an AI analog input; the AI analog input 12 is taken from the analog sampling circuit 3 of another intelligent power module, outputs the sampled voltage and sampled current, passes through the protection circuit 13 and the connector of the intelligent power module, and is sent to the redundant intelligent power module as an AI analog input.

[0014] Furthermore, the intelligent power supply module is installed in the TSI instrument monitor frame 103, and the intelligent power supply module is communicatively connected with the monitor parameter measurement module 104 installed in the TSI instrument monitor frame 103, and provides ±24V DC power for the monitor parameter measurement module 104; the intelligent power supply module is a main power supply module 101 and a redundant power supply module 102, and the main power supply module 101 is used as an independent power supply mode and provides ±24V DC power for the monitor parameter measurement module 104 in the TSI instrument monitor frame 103; the redundant power supply module 102 is used to be configured in redundant mode and is used to automatically switch when the main power supply module 101 fails.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) The intelligent power module of the present invention can be configured to operate in an independent power supply mode or a redundant power supply mode, thereby improving the reliability of the power supply for the TSI instrument.

[0017] (2) The present invention designs the power module as an intelligent power module. The dual-channel power module can be used redundantly. The system defaults to a balanced power distribution mode, and can also support a coordinated power distribution mode according to customer requirements.

[0018] (3) The present invention adopts intelligent power module to design redundant power supply, which overcomes the various drawbacks of traditional redundant power supply, ensures the stable operation of dual power supply module, provides sufficient margin for the power supply module, and improves the reliability of TSI instrument power supply;

[0019] (4) The present invention overcomes the disadvantages of the traditional hot standby power module redundancy, which usually adopts a high selection mode and can only cope with partial failures caused by power failure of a power module, etc. The load distribution is very unreasonable, the power module with load is usually easily damaged, and the power module without load is idle for a long time. In addition, the power module has no warning or the warning point is fixed, which is not easy to change. [Brief Description of the Drawings]

[0020] Figure 1 It is a principle block diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the TSI instrument configuration of the present invention;

[0022] In the figure: 1, AC-DC conversion circuit 2, switching circuit 3, analog sampling circuit 4, operation unit 5, ADC analog-to-digital conversion circuit 6, polling circuit 7, DI switch input circuit 8, DO switch output circuit 9, CAN bus internal communication circuit 10, RS485 bus internal communication circuit 11, AO analog output 12, AI analog input 13, protection circuit 101, main power supply module 102, redundant power supply module 103, TSI instrument monitor frame 104, monitor parameter measurement module. [Specific implementation method]

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] The present invention provides an intelligent power module for use in steam turbine monitoring and protection instruments. It can provide a reliable and stable ±24V DC power supply for the monitor module in the TSI instrument frame. The intelligent power module can operate in either standalone or redundant mode. The module can communicate within the monitor frame to configure the output power percentage of the intelligent power module, set alarms for abnormal conditions such as high temperature and overcurrent, and control the module's operating conditions. The intelligent power module provides the monitor system with operating parameter information such as voltage, current, and operating status. Through the monitor frame's internal communication network, it monitors the system's power status in real time, improving the operational safety of the steam turbine monitoring and protection instrument.

[0025] As attached Figure 1As shown, it is a flowchart of the working process of the intelligent power module of the present invention. The intelligent power module includes an AC-DC conversion circuit 1, a switching circuit 2, an analog sampling circuit 3, an arithmetic unit 4, an ADC analog-to-digital conversion circuit 5, a polling circuit 6, a DI switch input circuit 7, a DO switch output circuit 8, a CAN bus internal communication circuit 9, an RS485 bus internal communication circuit 10, an AO analog output 11, an AI analog input 12 and a protection circuit 13. After the intelligent power module is connected to a 220VAC AC input, it is converted into a ±24V DC power supply by the AC-DC conversion circuit 1. The output end of the AC-DC conversion circuit 1 is connected to the switching circuit 2. The switching circuit 2 is connected to the 220VAC AC input. The output end of circuit 2 is connected to the protection circuit 13, and the input end of the AC-DC conversion circuit 1 is also connected to the protection circuit 13. The protection circuit 13 serves as protection for signal output and input. The output end of the protection circuit 13 is connected to the busbar of the TSI instrument monitor frame. The DC power supply is output after passing through the switching circuit 2, and is sent to the busbar of the TSI instrument monitor frame through the protection circuit 13, and supplies power to the monitor module in the frame; the AC-DC conversion circuit 1 is connected to the analog sampling circuit 3, and the output end of the analog sampling circuit 3 is respectively connected to the protection circuit 13 and the polling circuit 6. The protection circuit 13 is connected to the polling circuit 6, and the output end of the polling circuit 6 is connected to the ADC analog-to-digital conversion circuit 5.

[0026] The intelligent power module used in steam turbine monitoring and protection instruments has its components described in detail as follows:

[0027] AC-DC conversion circuit 1: After the intelligent power module receives 220VAC AC input, it is converted into ±24V DC power through AC-DC. The power is then output through a set of switching circuits 2 and sent to the busbar of the monitor frame through a protection circuit 13 to power the monitor module inside the frame. The AC and DC ends of the AC-DC conversion circuit are isolated, with an isolation voltage of 4000V and a conversion efficiency of 90%.

[0028] The switching circuit 2 is used to achieve redundant and controllable power output, and is composed of a power regulation and negative feedback circuit.

[0029] The analog sampling circuit 3 converts the AC-DC into a ±24V DC power supply. Its output voltage and current are collected and regulated by the sampling circuit and then output in two ways. One is output in the form of AO analog output, passes through the protection circuit 13, and is sent to another intelligent power module with redundancy through the connector of the intelligent power module. It is sent to the polling circuit of the other intelligent power module as AI analog input; the other is input into the ADC analog-to-digital conversion circuit 5 through the input polling circuit 6. The voltage and current sampled by the other intelligent power module with redundancy with this power module are input into the polling circuit in the form of AI analog input 12. The sampling circuit uses two low-noise, high-sensitivity current sensor ICs to sample the current. The giant magnetoresistance (GMR) technology is used. The primary conductor resistance is only 1.1mΩ, and the power loss is very small.

[0030] The operation unit 4 is the core component of the intelligent power module. It is a control circuit composed of the CPU chip as the core, and completes the control, operation, analog input data acquisition, analog output, switch input, switch output, etc. of each functional circuit of the intelligent power module.

[0031] The ADC analog-to-digital conversion circuit 5 completes the sampling of the output voltage and current of the intelligent power module. The ADC analog-to-digital conversion circuit adopts a programmable 16-bit high-speed SAR ADC, which is powered by a single power supply. Its reference source is integrated inside the ADC analog-to-digital conversion chip.

[0032] Polling circuit 6, the polling circuit is essentially a switching circuit for a set of input signals. The polling circuit has two inputs, one representing the voltage and current analog signals of the actual power consumption of this power module, and the other representing the voltage and current analog signals of the actual power consumption of another set of intelligent power modules that are redundant with this power module. Under the control of the CPU circuit, the polling circuit switches the two analog input signals in turn and inputs them into the ADC analog-to-digital conversion circuit. The polling circuit is composed of several MOSFET relays, achieving a perfect combination of fast and frequent operation and shock resistance. Using the polling circuit, a set of ADC analog-to-digital conversion circuits can be designed and used, saving hardware costs.

[0033] DI switch input circuit 7, the intelligent power module provides two dry node switch inputs, the query voltage is 5V, and the signal is isolated by optocoupler. DI is used as the signal input for communicating with other modules.

[0034] DO switch output circuit 8, the intelligent power module provides an electromagnetic relay output, the contact type is dry contact, with a load capacity of 6A 250VAC / 30VDC, and DO serves as the alarm output of the voltage module.

[0035] The intelligent power module provides two CAN bus internal communication circuits, each acting as a hot standby to improve communication reliability. Through these two CAN bus internal communication circuits within the monitor frame, the module's operating conditions can be controlled by configuring the output power ratio of the intelligent power module and setting alarms for abnormal conditions such as high temperature and overcurrent. The intelligent power module provides the monitoring system with operating parameter information such as voltage, current, and operating status. Through the monitor frame's internal communication network, the system's power status can be monitored in real time, improving system security.

[0036] RS485 bus internal communication loop 10, the intelligent power module provides an RS485 bus internal communication loop for receiving configuration instructions and module configuration information of the intelligent power module, such as: output power ratio, setting of abnormal alarms such as high temperature and overcurrent, etc.

[0037] AO analog output 11 is taken from the analog sampling circuit, outputs the sampled voltage and sampled current, passes through the protection circuit and the connector of the intelligent power module, and is sent to another redundant intelligent power module as the AI analog input.

[0038] AI analog input 12 is taken from the analog sampling circuit of another intelligent power module. The sampled voltage and current output are sent through the protection circuit and the connector of the intelligent power module to the redundant intelligent power module as AI analog input.

[0039] The protection circuit 13 is used to protect the signal output and input to prevent the intelligent power module from being damaged due to faults such as short circuit.

[0040] As attached Figure 2The figure shows a schematic diagram of the TSI instrument configuration according to the present invention, comprising a main power supply module 101, a redundant power supply module 102, a TSI instrument monitor frame 103, and a monitor parameter measurement module 104. Specifically, an intelligent power supply module is installed in the TSI instrument monitor frame 103. The intelligent power supply module communicates with the monitor parameter measurement module 104 installed therein and provides ±24V DC power to the monitor parameter measurement module 104. The intelligent power supply module serves as both the main power supply module 101 and the redundant power supply module 102. The main power supply module 101 is used in standalone mode and provides ±24V DC power to the monitor parameter measurement module 104 in the TSI instrument monitor frame 103. The redundant power supply module 102 is configured for redundant mode, automatically switching if the main power supply module 101 fails. This schematic diagram illustrates a dual power supply module configuration, with both the main power supply module 101 and the redundant power supply module 102 installed in the TSI instrument monitor frame. If only a single power supply module is required, a blind plate is installed in the redundant power supply module's position.

[0041] The two intelligent power modules can be used redundantly. The default mode is balanced power distribution, which achieves balanced power distribution by comparing the output voltages of the two power supplies. A coordinated power distribution mode is also supported. In this mode, the arithmetic unit calculates the voltage and current parameters of the two intelligent power modules within the framework, the power supply voltages, and the voltage and current parameters of the redundant power supply (in the form of AI analog inputs). The switching circuit then coordinates the outputs. Technical specifications for this intelligent power module include: input voltage 200V to 240VAC, 50 / 60Hz; output voltages +24VDC / 5A, -24VDC / 2.5A; conversion efficiency 90%; output ripple ≤150mV at 20MHz bandwidth; and load regulation ±1.0% at 0% to 100% load.

[0042] The intelligent power supply module used in the steam turbine monitoring and protection instrument described in the present invention can provide a reliable and stable ±24V DC power supply for the monitor module in the TSI instrument frame, and ensure that when the intelligent power supply module works in the independent power supply mode, even if the TSI instrument is running at full load, each monitor module can work stably and provide sufficient power supply margin to ensure that the TSI instrument can operate reliably for a long time; when the TSI instrument is used in a large steam turbine unit, in order to improve the operational reliability of the TSI instrument, it is necessary to configure a redundant power supply module mode for power supply. The intelligent power supply module can be configured to be used in redundant mode. The module can communicate internally through the monitor frame, and by configuring the proportion of the output power of the intelligent power supply module and setting abnormal alarms such as high temperature and overcurrent, the operating conditions of the module can be controlled. The intelligent power supply module provides the monitor system with operating parameter information such as voltage, current, and operating status. Through the internal communication network of the monitor frame, the system power supply status can be monitored in real time, thereby improving the operational safety of the steam turbine monitoring and protection instrument.

[0043] Specifically, the intelligent power module provides a reliable and stable ±24V DC power supply for the monitor module in the TSI instrument frame. When the intelligent power module is used as an independent power supply, it provides ample power margin when the TSI instrument is operating at full load. Second, when a redundant power module is required, the intelligent power module can be configured for redundant mode. When a power module fails, it automatically switches to a non-disruptive mode. Third, the intelligent power module can communicate within the monitor frame. By configuring the output power ratio of the two intelligent power modules and setting alarms for abnormal conditions such as high temperature and overcurrent, the module's operating conditions can be controlled. Fourth, the intelligent power module provides the monitor system with operating parameter information such as voltage, current, and operating status. Through the monitor frame's internal communication network, it monitors the system's power supply status in real time, improving the operational safety of the turbine monitoring and protection instrumentation.

[0044] The intelligent power module can be configured in standalone power supply mode and used as an independent power supply to provide a reliable and stable ±24V DC power supply for the monitor module in the TSI instrument frame. The intelligent power module can also be configured in redundant mode. When a failure occurs in one of the power modules, it automatically switches without disturbance, without affecting the normal operation of the TSI instrument and without mistakenly sending alarm signals other than power failure. The intelligent power module provides an RS485 bus internal communication circuit for receiving configuration instructions and module configuration information for the intelligent power module, such as the output power percentage, alarm configuration settings for abnormal conditions such as high temperature and overcurrent, and other information. The intelligent power module also provides two CAN bus internal communication circuits that serve as hot standby for each other, providing the monitor system with operating parameter information such as voltage, current, and operating status, and real-time monitoring of the system power status through the monitor frame's internal communication network.

[0045] The present invention is not limited to the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. An intelligent power module for use in a steam turbine monitoring and protection instrument, characterized by: The intelligent power module comprises an AC-DC conversion circuit (1), a switching circuit (2), an analog sampling circuit (3), an ADC analog-to-digital conversion circuit (5), a polling circuit (6) and a protection circuit (13). After the intelligent power module is connected to a 220VAC AC input, the AC-DC conversion circuit (1) converts the AC power into a ±24V DC power supply. The output end of the AC-DC conversion circuit (1) is connected to the switching circuit (2), the output end of the switching circuit (2) is connected to the protection circuit (13), the input end of the AC-DC conversion circuit (1) is also connected to the protection circuit (13), the protection circuit (13) serves as a signal output and input protection, and the output end of the protection circuit (13) is connected to a TSI instrument. The busbar of the monitor frame, the DC power supply is output after passing through the switching circuit (2), and is sent to the busbar of the TSI instrument monitor frame through the protection circuit (13), and supplies power to the monitor module in the frame; the AC-DC conversion circuit (1) is connected to the analog sampling circuit (3), the output end of the analog sampling circuit (3) is respectively connected to the protection circuit (13) and the polling circuit (6), the protection circuit (13) is connected to the polling circuit (6), and the output end of the polling circuit (6) is connected to the ADC analog-to-digital conversion circuit (5); the voltage and current output by the AC-DC conversion circuit (1) are collected and regulated by the analog sampling circuit (3), and then output in two ways: one is output as AO analog output (11) The output is output in the form of a protection circuit (13), and is sent to another intelligent power module that is redundant with the power module through the connector of the intelligent power module, and is sent to the polling circuit (6) of the other intelligent power module as an AI analog input; the other is input to the ADC analog-to-digital conversion circuit (5) after passing through the input polling circuit (6), and the voltage and current sampled by the other intelligent power module that is redundant with the power module are input to the polling circuit (6) in the form of an AI analog input (12); the polling circuit (6) has two inputs, one of which represents the voltage and current analog signals of the actual power consumption of the intelligent power module, and the other represents the actual power consumption of the other intelligent power module that is redundant with the power module. The polling circuit (6) switches the two analog input signals in turn under the control of the CPU and inputs them into the ADC analog-to-digital conversion circuit (5); the CAN bus internal communication circuit (9) provides two CAN bus internal communication circuits for the intelligent power module, and the two CAN bus internal communication circuits are hot standby for each other; the intelligent power module is connected to the monitor parameter measurement module (104) installed in the TSI instrument monitor frame (103); the intelligent power module is a main power supply module (101) and a redundant power supply module (102), and the redundant power supply module (102) is used to automatically switch when the main power supply module (101) fails.

2. The intelligent power module for use in a steam turbine monitoring and protection instrument according to claim 1, wherein: The switching circuit (2) is composed of a power regulation and negative feedback circuit, and the switching circuit (2) is used to achieve redundant and controllable power output; the analog sampling circuit (3) is provided with a current sensor IC and a giant magnetoresistive GMR chip, and the analog sampling circuit (3) uses two current sensor ICs to sample current.

3. The intelligent power module for use in a steam turbine monitoring and protection instrument according to claim 1, wherein: The intelligent power module is provided with an operation unit (4), which is composed of a CPU chip. The operation unit (4) is used to complete the control, operation, analog input data acquisition, analog output, switch input, and switch output of each functional circuit of the intelligent power module.

4. The intelligent power module for use in a steam turbine monitoring and protection instrument according to claim 1, wherein: The ADC analog-to-digital conversion circuit (5) is used to complete the sampling of the output voltage and current of the intelligent power module. The ADC analog-to-digital conversion circuit (5) adopts a programmable 16-bit high-speed SAR ADC, is powered by a single power supply, and its reference source is integrated inside the ADC analog-to-digital conversion chip.

5. The intelligent power module for use in a steam turbine monitoring and protection instrument according to claim 1, wherein: The intelligent power module is provided with a DI switch input circuit (7) and a DO switch output circuit (8). The DI switch input circuit (7) provides two dry node switch inputs for the intelligent power module, uses an optical coupler for signal isolation, and its DI is used as a signal input for contacting other modules; the DO switch output circuit (8) provides one electromagnetic relay output for the intelligent power module, the contact type is a dry node, and its DO is used as an alarm output of the voltage module.

6. The intelligent power module for use in a steam turbine monitoring and protection instrument according to claim 1, wherein: The intelligent power module is provided with a CAN bus internal communication circuit (9) and an RS485 bus internal communication circuit (10); the RS485 bus internal communication circuit (10) provides the intelligent power module with an RS485 bus internal communication circuit for receiving configuration instructions for the intelligent power module and configuration information of the module.

7. The intelligent power module for use in a steam turbine monitoring and protection instrument according to claim 1, wherein: The AO analog output (11) is taken from the analog sampling circuit (3), outputs the sampled voltage and the sampled current, passes through the protection circuit (13) through the connector of the intelligent power module, and is sent to another intelligent power module that is redundant with each other as an AI analog input; the AI analog input (12) is taken from the analog sampling circuit (3) of another intelligent power module, outputs the sampled voltage and the sampled current, passes through the protection circuit (13) through the connector of the intelligent power module, and is sent to the intelligent power module that is redundant with each other as an AI analog input.

8. The intelligent power module for use in a steam turbine monitoring and protection instrument according to claim 1, wherein: The intelligent power supply module is installed in the TSI instrument monitor frame (103) and provides ±24V DC power to the monitor parameter measurement module (104); the main power supply module (101) is used as an independent power supply mode and provides ±24V DC power to the monitor parameter measurement module (104) in the TSI instrument monitor frame (103).

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