Intelligent substation control locking test system

Abstract

The utility model discloses an intelligent substation control locking test system, and relates to the technical field of control locking test. The device comprises a test line module, a sensor module, a sensor signal conditioning circuit, a current signal conditioning circuit, a voltage signal conditioning circuit, an analog switch unit, a voltage division following filtering unit, an A / D conversion unit, a controller module, a locking device, a data transmission module, a man-machine interaction module, an alarm module, a clock module, a memory module and a power supply module. According to the utility model, the line detection device is added, the live-line and grounding states of equipment lines between transformer substations can be detected in real time through the sensor and the test line, and meanwhile, an operator is forced to operate according to operation rules and processes by combining with the electronic locking device; power transmission accidents of electrified closing of the grounding knife switch or hanging of a temporary grounding wire and closing of the grounding knife switch can be effectively prevented, so that the whole line maintenance process is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of control locking test, in particular to a control locking test system for an intelligent substation. Background Art

[0002] A substation is a location within a power system that transforms voltage and current, receives electricity, and distributes it. The substation within a power plant is a step-up substation, whose function is to boost the voltage of electricity generated by the generator and feed it into the high-voltage grid.

[0003] Power operation accidents are the biggest enemy of safe power system operation. Eliminating operational errors and implementing mandatory procedural control are important topics that power safety and error prevention professionals have been diligently researching. Installing error prevention devices to prevent serious accidents has been implemented in power systems and switchgear manufacturers. Among the five power protection measures, accidents involving live opening (closing) switches, live earthing switches, and live earthing switches account for a significant proportion. Therefore, resolving these issues is paramount in preventing error operations.

[0004] Currently, the status of the line or the opposite device cannot be effectively detected, which leaves a fatal hidden danger in the safe operation of the power supply. If these interlocks are combined with line detection devices, they will play a better enforcement role. Utility Model Content

[0005] The purpose of the utility model is to provide an intelligent substation control locking test system in view of the defects and shortcomings of the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A smart substation control locking test system comprises a test line module, a sensor module, a sensor signal conditioning circuit, a current signal conditioning circuit, a voltage signal conditioning circuit, an analog switch unit, a voltage divider follower filter unit, an A / D conversion unit, a controller module, a locking device, a data transmission module, a human-computer interaction module, an alarm module, a clock module, a memory module and a power supply module. The sensor module is connected to the controller module in sequence through the sensor signal conditioning circuit, the current signal conditioning circuit, the voltage signal conditioning circuit, the analog switch unit, the voltage divider follower filter unit and the A / D conversion unit. The test line module, the locking device, the data transmission module, the human-computer interaction module, the alarm module, the clock module, the memory module and the power supply module are respectively connected to the controller module.

[0008] As a further preferred embodiment of the intelligent substation control and locking test system of the present invention, the controller module includes a signal acquisition module, a control module, an information storage module, an operation information display module, a locking device drive unit, a synchronous clock control module, a command deframing module, a data reading module, as well as a power supply circuit, a reset circuit, a crystal oscillator circuit, a download circuit and a configuration SPI Flash circuit; the signal acquisition module, the information storage module, the operation information display module, the locking device drive unit, the synchronous clock control module, the command deframing module, the data reading module, as well as the power supply circuit, the reset circuit, the crystal oscillator circuit, the download circuit and the configuration SPI Flash circuit are respectively connected to the control module.

[0009] As a further preferred solution of the intelligent substation control locking test system of the utility model, the sensor module adopts a charge and current acquisition sensor.

[0010] As a further preferred embodiment of the intelligent substation control locking test system of the present invention, the sensor signal conditioning circuit includes an analog signal input terminal, a resistor R1, a resistor R2, a capacitor C1, and an operational amplifier U1. The analog signal input terminal is respectively connected to one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, the other end of the capacitor C1 is respectively connected to the other end of the resistor R1 and the positive input terminal of the operational amplifier U1, and the negative input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier U1.

[0011] As a further preferred embodiment of the intelligent substation control locking test system of the present invention, the voltage signal conditioning circuit includes a voltage signal input end, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, and an operational amplifier U2. The voltage signal input end is connected to one end of the resistor R3, the other end of the resistor R3 is respectively connected to one end of the resistor R4 and one end of the resistor R5, the other end of the resistor R5 is connected to one end of the capacitor C2, the other end of the capacitor C2 is respectively connected to the other end of the resistor R4 and the positive input end of the operational amplifier U1, and the negative input end of the operational amplifier U2 is connected to the output end of the operational amplifier U2.

[0012] As a further preferred embodiment of a smart substation control locking test system of the present invention, the voltage divider follower filter circuit includes an operational amplifier U3, a resistor R11, a resistor R12, an operational amplifier U4, a resistor R13, and a capacitor C7. The output end of the operational amplifier U3 is connected to one end of the resistor R12, and the other end of the resistor R12 is respectively connected to one end of the resistor R11 and the positive input end of the operational amplifier U4. The output end of the operational amplifier U4 is connected to one end of the resistor R13, and the other end of the resistor R13 is respectively connected to one end of the capacitor C7 and the A / D conversion unit. The other end of the capacitor C7 is grounded, and the other end of the resistor R11 is connected to the current signal conditioning circuit.

[0013] As a further preferred solution of the intelligent substation control locking test system of the utility model, the analog switch unit adopts the ADG706 chip.

[0014] As a further preferred solution of the intelligent substation control locking test system of the utility model, the current signal conditioning circuit adopts the ACS714 chip of Allegro, which is a current-isolated current sensor with common-mode rejection field effect, and is composed of a high-precision, low-bias linear Hall sensor.

[0015] Compared with the prior art, the above technical solution adopted by the present invention has the following technical effects:

[0016] 1. The utility model discloses an intelligent substation control interlocking test system, comprising a test line module, a sensor module, a sensor signal conditioning circuit, a current signal conditioning circuit, a voltage signal conditioning circuit, an analog switch unit, a voltage divider follower filter unit, an A / D conversion unit, a controller module, a interlocking device, a data transmission module, a human-computer interaction module, an alarm module, a clock module, a memory module, and a power supply module. The utility model adds a line detection device, which can detect the live and grounding status of equipment lines between substations in real time through sensors and test lines. At the same time, when used in combination with an electronic interlocking device, it forces operators to operate in accordance with operating rules and procedures, effectively preventing accidents such as closing a live grounding switch or hanging a temporary grounding wire, or energizing a live grounding switch, thereby making the entire line maintenance process safer and more reliable.

[0017] 2. The sensor module of the present invention processes the collected signals through signal conditioning, analog switching, voltage follower and anti-aliasing filtering, analyzes the link establishment time, and then converts them using a successive approximation AD chip before uploading them to the controller module; the controller module of the present invention has a built-in electrical anti-error operation rule process, and has functions such as data analysis, processing, logical judgment, data storage, operation information display and error alarm, which can guide operators to operate according to the anti-error rules and processes. The maintenance of power transmission and transformation lines is highly targeted, intuitive and practical, and highly intelligent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application, but do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 This is a structural principle diagram of a smart substation control locking test system of the utility model;

[0020] Figure 2This is a schematic diagram of the structure of the controller module of the utility model;

[0021] Figure 3 This is a circuit diagram of the sensor signal conditioning circuit of the utility model;

[0022] Figure 4 This is a circuit diagram of the voltage signal conditioning circuit of the utility model;

[0023] Figure 5 The utility model is a circuit diagram of a voltage-dividing follower filter circuit. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions are only used to explain the present invention but are not intended to limit the present invention.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention:

[0026] A smart substation control interlock test system, such as Figure 1 As shown, it includes a test line module, a sensor module, a sensor signal conditioning circuit, a current signal conditioning circuit, a voltage signal conditioning circuit, an analog switch unit, a voltage divider follower filter unit, an A / D conversion unit, a controller module, a locking device, a data transmission module, a human-computer interaction module, an alarm module, a clock module, a memory module and a power supply module. The sensor module is connected to the controller module in sequence through the sensor signal conditioning circuit, the current signal conditioning circuit, the voltage signal conditioning circuit, the analog switch unit, the voltage divider follower filter unit and the A / D conversion unit. The test line module, the locking device, the data transmission module, the human-computer interaction module, the alarm module, the clock module, the memory module and the power supply module are respectively connected to the controller module.

[0027] The utility model adds a line detection device, which can detect the energized and grounded status of equipment lines between substations in real time through sensors and test lines. At the same time, it is used in combination with an electronic locking device to force operators to operate in accordance with operating rules and procedures, which can effectively prevent the occurrence of accidents such as closing the grounding knife switch under power or hanging a temporary grounding wire, and closing the grounding knife switch under power supply, making the entire line maintenance process safer and more reliable; the sensor module processes the collected signal through signal conditioning, analog switching, voltage follower and anti-aliasing filtering, and analyzes the link establishment time, and then converts it using a successive approximation AD chip, and then uploads it to the controller module. The controller module of the utility model is controlled by a single-chip microcomputer and has an embedded electrical anti-error operation rule process. It has functions such as data analysis, processing, logical judgment, data storage, operation information display and error alarm, which can guide operators to operate according to the anti-error rules and procedures. The maintenance of transmission and transformation lines is highly targeted, intuitive and practical, and highly intelligent.

[0028] The sensor module detects the line live signal in real time, detects the line grounding signal in real time when the test line is under maintenance, and the locking device outputs the switch status signal in real time and transmits it to the controller module respectively. The controller module completes the analysis and processing of the input signal and the logical judgment according to the operating rules, and outputs the control signal to control the opening and closing of the locking device and display the operation information.

[0029] The controller module detects switch status signals and line energization signals in real time, performs logical judgment according to operating rules, displays operation prompts, and outputs the correct control signals. When the line is in operation, the circuit breaker is closed and the line is energized, and the controller module outputs a control signal to force the locking device to lock. When the line is under maintenance, the circuit breaker is opened. Once the controller module verifies that the line is de-energized, it outputs a control signal to open the locking device. The operator then separates the isolation switch and closes the grounding switch. After these operations are completed, the operator follows the controller module's prompts to connect a test line to the three-phase power line being inspected and locks the circuit breaker. After maintenance is complete, the controller module outputs a control signal to open the grounding switch locking device. The operator separates the grounding switch and then uses the test line to check whether the remote and local grounding systems of the other substation have been removed. Only when all grounding systems have been removed does the controller module prompt the test line to be removed. Once the test line is connected back to the device, the controller module outputs a control signal to open the isolation switch locking device. The operator completes the isolation switch closing operation, completing the maintenance process. When the circuit breaker is closed and energized, the line returns to operation.

[0030] like Figure 2As shown, the controller module includes a signal acquisition module, a control module, an information storage module, an operation information display module, a locking device driving unit, a synchronous clock control module, a command deframing module, a data interpretation module, as well as a power supply circuit, a reset circuit, a crystal oscillator circuit, a download circuit and a configuration SPI Flash circuit; the signal acquisition module, the information storage module, the operation information display module, the locking device driving unit, the synchronous clock control module, the command deframing module, the data interpretation module, as well as the power supply circuit, the reset circuit, the crystal oscillator circuit, the download circuit and the configuration SPI Flash circuit are respectively connected to the control module.

[0031] The control unit of the controller module of the present invention is logically programmed according to electrical misoperation prevention rules, and its embedded software programming technology adopts existing technology, which will not be described in detail here.

[0032] Its working procedure is as follows: the controller module first detects the switch signal. When the switch signal is closed, the sensor detects the high-voltage charge current signal in real time, and outputs a relay contact signal to force the locking device to not open or close. When the switch signal is open or closed (i.e., maintenance status), the sensor module detects the absence of the high-voltage charge current signal, outputs a relay contact signal to open the locking device, collects the status of the locking device and the switch device, and the switch device is fully operated. The controller module analyzes and processes the collected signal through the MCU, and fixes the test line to the line through the LCD display prompt and the controller module's operation key panel to perform ground signal detection. After the maintenance is completed, the controller module's signal acquisition unit has no ground signal. After analysis and processing by the MCU, the test line is removed, and the relay contact signal is output to open the locking device, closing the circuit breaker and supplying power.

[0033] Preferably, the sensor module adopts a charge and current acquisition sensor.

[0034] like Figure 3 As shown, the sensor signal conditioning circuit includes an analog signal input terminal, a resistor R1, a resistor R2, a capacitor C1, and an operational amplifier U1. The analog signal input terminal is respectively connected to one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, the other end of the capacitor C1 is respectively connected to the other end of the resistor R1 and the positive input terminal of the operational amplifier U1, and the negative input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier U1.

[0035] The operational amplifier is a key component of the conditioning circuit. This utility model uses the AD8608 operational amplifier chip from ADI. This chip combines many excellent features. It has four-rail input and output while being powered by a single power supply. It can ensure high speed while also ensuring extremely low noise and input bias current, and is widely applicable to various circuits.

[0036] Since the input impedance of the op amp is generally very high, it is very susceptible to external interference when the input pin is left floating. Therefore, setting resistor R2 can form a loop between the input end and the analog ground when the input pin is left floating, thereby ensuring the stability of the op amp.

[0037] like Figure 4 As shown, the voltage signal conditioning circuit includes a voltage signal input terminal, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, and an operational amplifier U2. The voltage signal input terminal is connected to one end of the resistor R3, the other end of the resistor R3 is respectively connected to one end of the resistor R4 and one end of the resistor R5, the other end of the resistor R5 is connected to one end of the capacitor C2, the other end of the capacitor C2 is respectively connected to the other end of the resistor R4 and the positive input terminal of the operational amplifier U1, and the negative input terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U2.

[0038] In the voltage conditioning circuit, the rail-to-rail op amp can maximize the input and output voltage swings close to the power supply voltage value, but there is still a large deviation under high current conditions. Since the input voltage range of the AD8608 is 0~0.5V, resistors R3 and R5 are set to form a voltage divider circuit to reduce the input voltage to below 5V.

[0039] Depending on the magnitude of the current and whether it is AC or DC, the corresponding current acquisition methods vary. Common current acquisition methods include coaxial shunts, current transformers, Rogowski coils, Hall sensors, and sampling resistors. The Hall sensor method is suitable for measuring both AC and DC currents and can measure large currents. The current signal conditioning circuit uses the Allegro ACS714 chip, a current-isolated current sensor with common-mode field effect rejection, composed of high-precision, low-bias linear Hall sensors.

[0040] The FGPA is used to control the analog switch to select the address switching channel to achieve the effect of time-sharing multiplexing. When switching channels, the analog switch will affect the change of capacitive load, resulting in signal oscillation or ringing. The faster the analog switch switching speed, the more obvious this phenomenon is. Therefore, the selection of analog switches is particularly important. By analyzing and comparing various different types of analog switches, this design uses the ADG706 chip.

[0041] Preferably, the analog switch unit adopts ADG706 chip.

[0042] Preferably, the current signal conditioning circuit uses the ACS714 chip of Allegro Corporation, which is a current-isolated current sensor with common-mode rejection field effect, and is composed of a high-precision, low-bias linear Hall sensor.

[0043] like Figure 5As shown, the voltage divider follower filter circuit includes an operational amplifier U3, a resistor R11, a resistor R12, an operational amplifier U4, a resistor R13, and a capacitor C7. The output end of the operational amplifier U3 is connected to one end of the resistor R12, and the other end of the resistor R12 is respectively connected to one end of the resistor R11 and the positive input end of the operational amplifier U4. The output end of the operational amplifier U4 is connected to one end of the resistor R13, and the other end of the resistor R13 is respectively connected to one end of the capacitor C7 and the A / D conversion unit. The other end of the capacitor C7 is grounded, and the other end of the resistor R11 is connected to the current signal conditioning circuit.

[0044] The signal passes through the analog switch, then through voltage divider, follower, and filter circuits before being input into the AD converter. The voltage follower circuit creates a high-impedance input and a low-impedance output, improving the circuit's load capacity. The operational amplifiers U3 and U4 use the AD8031 chip model. The ACS714 chip has a maximum sampling current of 5A.

[0045] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

[0046] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such, will not be interpreted in an idealized or overly formal sense.

[0047] The above embodiments are only for the purpose of illustrating the technical concept of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications made based on the technical solution in accordance with the technical concept of the present invention shall fall within the scope of protection of the present invention. The above embodiments of the present invention are described in detail, but the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A smart substation control interlock test system, characterized by: It includes a test line module, a sensor module, a sensor signal conditioning circuit, a current signal conditioning circuit, a voltage signal conditioning circuit, an analog switch unit, a voltage divider follower filter unit, an A / D conversion unit, a controller module, a locking device, a data transmission module, a human-computer interaction module, an alarm module, a clock module, a memory module and a power supply module. The sensor module is connected to the controller module in sequence through the sensor signal conditioning circuit, the current signal conditioning circuit, the voltage signal conditioning circuit, the analog switch unit, the voltage divider follower filter unit and the A / D conversion unit. The test line module, the locking device, the data transmission module, the human-computer interaction module, the alarm module, the clock module, the memory module and the power supply module are respectively connected to the controller module.

2. The intelligent substation control interlock test system according to claim 1, characterized in that: The controller module includes a signal acquisition module, a control module, an information storage module, an operation information display module, a locking device drive unit, a synchronous clock control module, a command deframing module, a data interpretation module, as well as a power supply circuit, a reset circuit, a crystal oscillator circuit, a download circuit and a configuration SPI Flash circuit; the signal acquisition module, information storage module, operation information display module, locking device drive unit, synchronous clock control module, command deframing module, data interpretation module, as well as a power supply circuit, a reset circuit, a crystal oscillator circuit, a download circuit and a configuration SPI Flash circuit are respectively connected to the control module.

3. The intelligent substation control locking test system according to claim 1, characterized in that: The sensor module adopts a charge and current acquisition sensor.

4. The intelligent substation control interlock test system according to claim 1, characterized in that: The sensor signal conditioning circuit includes an analog signal input terminal, a resistor R1, a resistor R2, a capacitor C1, and an operational amplifier U1. The analog signal input terminal is respectively connected to one end of the resistor R1 and one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, the other end of the capacitor C1 is respectively connected to the other end of the resistor R1 and the positive input terminal of the operational amplifier U1, and the negative input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier U1.

5. The intelligent substation control interlock test system according to claim 1, characterized in that: The voltage signal conditioning circuit includes a voltage signal input end, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, and an operational amplifier U2. The voltage signal input end is connected to one end of the resistor R3, the other end of the resistor R3 is respectively connected to one end of the resistor R4 and one end of the resistor R5, the other end of the resistor R5 is connected to one end of the capacitor C2, the other end of the capacitor C2 is respectively connected to the other end of the resistor R4 and the positive input end of the operational amplifier U1, and the negative input end of the operational amplifier U2 is connected to the output end of the operational amplifier U2.

6. The intelligent substation control interlock test system according to claim 1, characterized in that: The voltage divider follower filter circuit includes an operational amplifier U3, a resistor R11, a resistor R12, an operational amplifier U4, a resistor R13, and a capacitor C7. The output end of the operational amplifier U3 is connected to one end of the resistor R12, and the other end of the resistor R12 is respectively connected to one end of the resistor R11 and the positive input end of the operational amplifier U4. The output end of the operational amplifier U4 is connected to one end of the resistor R13, and the other end of the resistor R13 is respectively connected to one end of the capacitor C7 and the A / D conversion unit. The other end of the capacitor C7 is grounded, and the other end of the resistor R11 is connected to the current signal conditioning circuit.

7. The intelligent substation control interlock test system according to claim 1, characterized in that: The analog switch unit adopts ADG706 chip.

8. The intelligent substation control interlock test system according to claim 1, characterized in that: The current signal conditioning circuit adopts the ACS714 chip of Allegro Corporation, which is a current-isolated current sensor with common-mode rejection field effect, and is composed of a high-precision, low-bias linear Hall sensor.

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