Relay protection and exit matrix closed loop detection system

Abstract

The embodiment of the invention discloses a relay protection and outlet matrix closed-loop detection system, which belongs to the technical field of circuit detection, and comprises a detection sampling module for detecting and sampling a pulse signal of a tripping outlet pressing plate and obtaining protection action time data at the same time; the circuit processing module carries out preprocessing and isolation processing on detected and sampled pulse signals, the control processing module carries out data processing on the detected and sampled pulse signals, and the display operation module provides an operation interface and a function menu and carries out numerical value adjustment, state display and operation control. According to the embodiment of the invention, one-time dosage test can be realized, all experimental results can be obtained, the working efficiency is improved, the interference caused by external environmental factors is reduced, and the test is more accurate and more convenient.

Description

Technical Field

[0001] The present application belongs to the field of circuit detection technology, and specifically, relates to a relay protection and export matrix closed-loop detection system. Background Art

[0002] In actual application, the backup protection logic of the high, medium and low voltage sides of the main transformer is relatively complex, and the tripping matrix logic corresponding to different time limits of different types of protection is different. When the new main transformer protection is put into operation and the old main transformer protection device is inspected, it is very important to verify the correctness of the action and tripping logic of the protection device. The tripping logic after each type of protection action with different time limits is different.

[0003] There are two methods for traditional trip matrix logic measurement. One is to use the DC voltage range of a multimeter to measure the potential method. The test must be repeated many times to complete the verification of the trip matrix after a certain time limit protection action of a certain type of protection. It is very time-consuming to complete the logic verification of all protection trip matrices of the main transformer, and the accuracy of the measurement is difficult to guarantee. The other method is to use the passive input node of the relay protection tester. Since the protection tester has only a few passive nodes, it is impossible to connect all the trip nodes to the tester. In addition, the use of passive nodes requires the removal of the protection trip line, which is easy to cause operating interval tripping.

[0004] The current method uses dozens of protection logics for the two sets of main transformer protection. At least two people are required to coordinate and measure the logic of the protection tripping matrix dozens of times, which is time-consuming and labor-intensive, and there is a possibility of missed measurements. Summary of the invention

[0005] In order to solve the above problems and technical defects, the embodiment of the present application adopts the following technical solution, a relay protection and export matrix closed-loop detection system, including:

[0006] The detection sampling module includes a plurality of detection probes, which are used to detect and sample the pulse signal of the tripping outlet pressure plate and obtain the protection action time data;

[0007] The circuit processing module includes an isolation circuit and a sampling processing circuit, and is used for preprocessing and isolating the pulse signal of the detection sample;

[0008] A control processing module, including a control processing chip, is used to control the device and perform data processing on the pulse signal of the detection sampling;

[0009] The display operation module includes a memory and an operation screen, which is used to provide an operation interface and a function menu, perform numerical value adjustment, status display and operation control, and save the pulse signal and operation record of the detection sampling;

[0010] The power module is used to supply power to other modules.

[0011] Preferably, the output end of the detection probe is electrically connected to the input end of the sampling and processing circuit, the output end of the sampling and processing circuit is electrically connected to the input end of the isolation circuit, the output end of the isolation circuit is electrically connected to the input end of the control processing chip, the input end of the control processing chip is electrically connected to the input end of the memory, the operation screen is electrically connected to the control processing chip, and the output end of the power module is electrically connected to the operation screen, the control processing chip, the isolation circuit and the input end of the sampling and processing circuit.

[0012] Furthermore, there are 16 detection probes, sampling and processing circuits and isolation circuits, each detection probe corresponds to a trip outlet pressure plate, each sampling and processing circuit corresponds to a detection probe, and each isolation circuit corresponds to a sampling and processing circuit.

[0013] Furthermore, the detection probe is in a normally open state, and the contact state is obtained in real time. The detection probe is provided with two indicator lights, namely, an on light and an off light;

[0014] When a pulse signal is detected and the pulse width reaches a first preset value, the switch-on lamp lights up;

[0015] When the pulse width reaches a second preset value, the pulse signal is determined to be valid, and the voltage value of the pulse signal is displayed;

[0016] When the pulse signal disappears, the on light goes out and the off light turns on;

[0017] If the interval between the disappearance time of the last pulse signal and the appearance time of the current pulse signal reaches a third preset value, the current pulse voltage is used as a new pulse signal.

[0018] Preferably, the control processing chip is a DSP chip processor, which is responsible for logic parameter control, waveform generation, timing control and simulation signal calculation.

[0019] Furthermore, the control processing chip can perform self-test on 16 signal paths and 16 trip output input signals and 16 trip output output signals. The self-test is performed by comparing and judging the simulated signal output with the sampled signal.

[0020] Furthermore, the steps of the self-test are as follows:

[0021] Wiring the tripping outlet of the target device to the input terminal of the detection probe, based on the preset simulated fault quantity of the target device;

[0022] After the target device is started, the control processing chip sends the analog voltage source and current source, and the target device issues a trip command and outputs the fault quantity. Each adjustment of the fault quantity output refreshes and re-times T1;

[0023] When the detected fault quantity reaches the preset simulated fault quantity, it is judged that the input action threshold is reached, the output signal of the control processing chip is reversed, and the time T2 is recorded;

[0024] The control processing chip records the last output amplitude U&I, takes the output amplitude U&I as the protection action amplitude, and calculates the time T1 and time T2 to obtain the protection action time T2-T1;

[0025] Compare the protection action amplitude and protection action time to determine whether they meet the test standards.

[0026] Furthermore, the analog voltage source sent by the control processing chip is sent by a combination of a preamplifier input stage, a voltage amplifier stage, a MOS tube and a tube current expansion stage;

[0027] The voltage amplification adopts a linear power amplifier chip, which can operate at a bipolar working voltage and form an external push-pull complementary symmetrical circuit with the tube current expansion stage.

[0028] Still further, the analog current source preamplifier input stage, power amplifier output stage and differential feedback amplifier stage sent by the control processing chip are combined and sent;

[0029] The power amplifier uses a linear power operational amplifier. The differential amplifier circuit feeds the sampling signal back to the input stage with a voltage drop, realizing negative feedback of the entire amplifier circuit and controlling the output current to be proportional to the input voltage.

[0030] Furthermore, the control processing chip is provided with a work abnormality monitoring unit to monitor the output of each module in real time to ensure that the test runs within a safe range.

[0031] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0032] This application adopts the idea of ​​closed-loop testing, and verifies the entire process from the protection device receiving the fault quantity to the trip matrix exit. Therefore, the relay protection logic check is added to verify the logic, tripping and closing time and action setting value of the protection device, realize a one-time increase test, obtain all experimental results, and improve work efficiency; the device uses a DSP chip as the control core, which is responsible for multiple tasks such as logic parameter control and waveform generation, timing control simulation signal calculation, etc. After current and voltage power amplification, it generates current and voltage test quantities within a certain power and amplitude range. While generating relay protection test quantities, the processor can also observe the action of the relay in real time, send commands through the touch screen, and the DSP processor executes, which is easy to operate; simulate the various power components in the power system when a fault occurs, the detailed action of the trip matrix of the relay protection, add simulated voltage source and simulated current source, and study the increase of trip action signal threshold setting, reduce the interference caused by external environmental factors, and make the test more accurate and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In the attached picture:

[0034] Figure 1 A schematic diagram of the system structure of an embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of a voltage simulation source according to an embodiment of the present application;

[0036] Figure 3 This is a schematic diagram of the current simulation source according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Example 1

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, the relay protection and export matrix closed-loop detection system includes:

[0040] A detection sampling module, including a plurality of detection probes, is used to detect and sample the pulse signal of the trip outlet pressure plate;

[0041] The circuit processing module includes an isolation circuit and a sampling processing circuit, and is used for preprocessing and isolating the pulse signal of the detection sample;

[0042] A control processing module, including a control processing chip, is used to control the device and perform data processing on the pulse signal of the detection sampling;

[0043] The display operation module includes a memory and an operation screen, which is used to provide an operation interface and a function menu, perform numerical value adjustment, status display and operation control, and save the pulse signal and operation record of the detection sampling;

[0044] The power module is used to supply power to other modules.

[0045] The output end of the detection probe is electrically connected to the input end of the sampling processing circuit, the output end of the sampling processing circuit is electrically connected to the input end of the isolation circuit, the output end of the isolation circuit is electrically connected to the input end of the control processing chip, the input end of the control processing chip is electrically connected to the input end of the memory, the operation screen is electrically connected to the control processing chip, and the output end of the power module is electrically connected to the input end of the operation screen, the control processing chip, the isolation circuit and the sampling processing circuit respectively.

[0046] There are 16 detection probes, sampling and processing circuits and isolation circuits. Each detection probe corresponds to a tripping outlet pressure plate, each sampling and processing circuit corresponds to a detection probe, and each isolation circuit corresponds to a sampling and processing circuit.

[0047] The detection probe is in the normally open state, and the contact status is obtained in real time. There are two indicator lights on the detection probe, one is the on light and the other is the off light;

[0048] When a pulse signal is detected and the pulse width reaches a first preset value, the switch-on lamp lights up;

[0049] When the pulse width reaches a second preset value, the pulse signal is determined to be valid, and the voltage value of the pulse signal is displayed;

[0050] When the pulse signal disappears, the on light goes out and the off light turns on;

[0051] If the interval between the disappearance time of the last pulse signal and the appearance time of the current pulse signal reaches a third preset value, the current pulse voltage is used as a new pulse signal.

[0052] The control processing chip is a DSP chip processor, model TMS320C6713BGDP225, which is responsible for logic parameter control, waveform generation, timing control and simulation signal calculation.

[0053] The control processing chip can perform self-inspection on 16 signal paths, 16 trip output input signals, and 16 trip output output signals. The self-inspection is performed by comparing and judging the pseudo signal output with the sampling signal.

[0054] Wiring the tripping outlet of the target device to the input terminal of the detection probe, based on the preset simulated fault quantity of the target device;

[0055] After the target device is started, the control processing chip sends the analog voltage source and current source, and the target device issues a trip command and outputs the fault quantity. Each adjustment of the fault quantity output refreshes and re-times T1;

[0056] When the detected fault quantity reaches the preset simulated fault quantity, it is judged that the input action threshold is reached, the output signal of the control processing chip is reversed, and the time T2 is recorded;

[0057] The control processing chip records the last output amplitude U&I, takes the output amplitude U&I as the protection action amplitude, and calculates the time T1 and time T2 to obtain the protection action time T2-T1;

[0058] Compare the protection action amplitude and protection action time to determine whether they meet the test standards.

[0059] The analog voltage source sent by the control processing chip is sent by the combination of the preamplifier input stage, the voltage amplifier stage, the MOS tube and the tube current expansion stage;

[0060] The voltage amplification adopts a linear power amplifier chip, which can operate at a bipolar working voltage and form an external push-pull complementary symmetrical circuit with the tube current expansion stage.

[0061] The analog current source preamplifier input stage, power amplifier output stage and differential feedback amplifier stage sent by the control processing chip are combined and sent;

[0062] The power amplifier uses a linear power operational amplifier. The differential amplifier circuit feeds the sampling signal back to the input stage with a voltage drop, realizing negative feedback of the entire amplifier circuit and controlling the output current to be proportional to the input voltage.

[0063] The control processing chip is equipped with a working abnormality monitoring unit to monitor the output of each module in real time to ensure that the test runs within a safe range.

[0064] The above-mentioned embodiments only express the preferred implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several modifications, improvements and substitutions can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. Relay protection and export matrix closed-loop detection system, characterized in that: include: The detection sampling module includes a plurality of detection probes, which are used to detect and sample the pulse signal of the tripping outlet pressure plate and obtain the protection action time data; The circuit processing module includes an isolation circuit and a sampling processing circuit, and is used for preprocessing and isolating the pulse signal of the detection sample; A control processing module, including a control processing chip, is used to control the device and perform data processing on the pulse signal of the detection sampling; The display operation module includes a memory and an operation screen, which is used to provide an operation interface and a function menu, perform numerical value adjustment, status display and operation control, and save the pulse signal and operation record of the detection sampling; The power module is used to supply power to other modules.

2. A relay protection and export matrix closed-loop detection system according to claim 1, characterized in that: The output end of the detection probe is electrically connected to the input end of the sampling and processing circuit, the output end of the sampling and processing circuit is electrically connected to the input end of the isolation circuit, the output end of the isolation circuit is electrically connected to the input end of the control processing chip, the input end of the control processing chip is electrically connected to the input end of the memory, the operation screen is electrically connected to the control processing chip, and the output end of the power module is electrically connected to the input end of the operation screen, the control processing chip, the isolation circuit and the sampling and processing circuit respectively.

3. A relay protection and export matrix closed-loop detection system according to claim 2, characterized in that: There are 16 detection probes, sampling and processing circuits and isolation circuits, each detection probe corresponds to a tripping outlet pressure plate, each sampling and processing circuit corresponds to a detection probe, and each isolation circuit corresponds to a sampling and processing circuit.

4. A relay protection and export matrix closed-loop detection system according to claim 3, characterized in that: The detection probe is in a normally open state, and the contact state is obtained in real time. There are two indicator lights on the detection probe, namely, an on light and an off light; When a pulse signal is detected and the pulse width reaches a first preset value, the switch-on lamp lights up; When the pulse width reaches a second preset value, the pulse signal is determined to be valid, and the voltage value of the pulse signal is displayed; When the pulse signal disappears, the on light goes out and the off light turns on; If the interval between the disappearance time of the last pulse signal and the appearance time of the current pulse signal reaches a third preset value, the current pulse voltage is used as a new pulse signal.

5. A relay protection and export matrix closed-loop detection system according to claim 1, characterized in that: The control processing chip is a DSP chip processor, which is responsible for logic parameter control, waveform generation, timing control and simulation signal calculation.

6. A relay protection and export matrix closed-loop detection system according to claim 5, characterized in that: The control processing chip can perform self-test on 16 signal paths, 16 tripping outlet input signals, and 16 tripping outlet output signals. The self-test is performed by comparing and judging the sampled signals in a pseudo signal output mode.

7. A relay protection and export matrix closed-loop detection system according to claim 6, characterized in that: The steps of the self-test are as follows: Connect the tripping outlet of the target device to the input terminal of the detection probe, and preset the simulated fault quantity based on the target device; After the target device is started, the control processing chip sends the analog voltage source and current source, and the target device issues a trip command and outputs the fault quantity. Each adjustment of the fault quantity output refreshes and re-times T1; When the detected fault quantity reaches the preset simulated fault quantity, it is judged that the input action threshold is reached, the output signal of the control processing chip is reversed, and the time T2 is recorded; The control processing chip records the last output amplitude U&I, takes the output amplitude U&I as the protection action amplitude, and calculates the time T1 and time T2 to obtain the protection action time T2-T1; Compare the protection action amplitude and protection action time to determine whether they meet the test standards.

8. A relay protection and export matrix closed-loop detection system according to claim 7, characterized in that: The analog voltage source sent by the control processing chip is sent by a combination of a preamplifier input stage, a voltage amplifier stage, a MOS tube and a tube current expansion stage; The voltage amplification adopts a linear power amplifier chip, which can operate at a bipolar working voltage and form an external push-pull complementary symmetrical circuit with the tube current expansion stage.

9. A relay protection and export matrix closed-loop detection system according to claim 7, characterized in that: The analog current source preamplifier input stage, power amplifier output stage and differential feedback amplifier stage sent by the control processing chip are combined and sent; The power amplifier uses a linear power operational amplifier. The differential amplifier circuit feeds the sampling signal back to the input stage with a voltage drop, realizing negative feedback of the entire amplifier circuit and controlling the output current to be proportional to the input voltage.

10. A relay protection and export matrix closed-loop detection system according to claim 7, characterized in that: The control processing chip is provided with a work abnormality monitoring unit to monitor the output of each module in real time to ensure that the test runs within a safe range.

Images