CN112444755B - Relay protection device power supply self-checking function detection system and detection method - Google Patents
Relay protection device power supply self-checking function detection system and detection method Download PDFInfo
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- CN112444755B CN112444755B CN202011297472.XA CN202011297472A CN112444755B CN 112444755 B CN112444755 B CN 112444755B CN 202011297472 A CN202011297472 A CN 202011297472A CN 112444755 B CN112444755 B CN 112444755B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Abstract
The invention discloses a detection system and a detection method for a self-checking function of a relay protection device power supply, wherein the detection system comprises the following components: the switching module is respectively and electrically connected with the adjustable power supply, the measurement and control CPU and the relay protection device to be measured; the adjustable power supply outputs a first voltage and an adjustable second voltage to the switching module; the measurement and control CPU controls the voltage value output by the switching module to the relay protection device through a high-level pulse signal, and the width of the high-level pulse signal is adjustable; the measurement and control CPU is electrically connected with the relay protection device, acquires an alarm signal of the relay protection device when the second voltage value is lower than the threshold voltage value, and detects a self-detection function of a power supply of the relay protection device according to the alarm signal and the high-level pulse signal. The input voltage and the duration time of the relay protection device are regulated, alarm signals output by the corresponding relay protection device are detected, threshold voltage value and duration drop time of the power self-detection of the relay protection device are detected, and reliability of the power self-detection function of the relay protection device is further detected.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to a detection system and a detection method for a self-checking function of a power supply of a relay protection device.
Background
At present, the requirements of a power system on the reliability of a relay protection device are higher and higher, under the influence of the current severe electromagnetic environment, the digital power supply system of the relay protection device can possibly generate a voltage short-time drop phenomenon, when the power supply voltage drops to a power supply monitoring threshold value, the time for triggering the self-checking error alarm of the power supply of the protection device is kept below the threshold voltage, the relay protection device can be locked, protection refusal can be caused, and the operation reliability of the power system is seriously influenced.
The current method for evaluating the power self-checking function of the relay protection device mainly looks at the delay of a power monitoring chip and the arrangement of software, and as for the practical evaluation method for the integrity and reliability of the power self-checking function, the method mainly relies on theory and software algorithm, and no detection method for practical verification of a hardware level exists.
Disclosure of Invention
The embodiment of the invention aims to provide a detection system and a detection method for a self-checking function of a power supply of a relay protection device, which are used for detecting threshold voltage value and continuous falling time of the self-checking function of the power supply of the relay protection device and further detecting reliability of the self-checking function of the power supply of the relay protection device by adjusting input voltage and duration time of the relay protection device and detecting alarm signals output by the corresponding relay protection device, so that accuracy and reliability of detection of the self-checking function of the power supply of the relay protection device are improved, and running stability of the relay protection device and a power system is improved.
In order to solve the above technical problems, a first aspect of the present invention provides a power self-checking function detection system of a relay protection device, including: an adjustable power supply, a switching module and a measurement and control CPU;
the switching module is respectively and electrically connected with the adjustable power supply, the measurement and control CPU and the relay protection device to be measured;
the adjustable power supply outputs a first voltage and a second voltage to the switching module, wherein the second voltage value is adjustable and smaller than the first voltage value;
the measurement and control CPU adjusts the voltage value output by the switching module to the relay protection device from the first voltage value to the second voltage value through a high-level pulse signal, wherein the width of the high-level pulse signal is adjustable;
and the measurement and control CPU is also electrically connected with the relay protection device, acquires an alarm signal of the relay protection device when the second voltage value is lower than a threshold voltage value, and detects a power supply self-checking function of the relay protection device according to the alarm signal and the high-level pulse signal.
Further, the measurement and control CPU detects the power self-checking function of the relay protection device by comparing the receiving time of the alarm signal with the triggering time of the high-level pulse signal and/or comparing the duration time of the alarm signal with the pulse width of the high-level pulse signal.
Further, the switching module includes: the first PMOS tube, the second PMOS tube, the switching triode, the first resistor, the second resistor, the third resistor and the fourth resistor;
the source electrode of the first PMOS tube is respectively connected with one end of the first voltage source and one end of the third resistor, the grid electrode of the first PMOS tube is respectively connected with one end of the first resistor and the output end of the measurement and control CPU, and the drain electrode of the first PMOS tube is respectively connected with the input end of the relay protection device and the drain electrode of the second PMOS tube;
the source electrode of the second PMOS tube is connected with the second voltage source, and the grid electrode of the second PMOS tube is respectively connected with the other end of the third resistor and the collector electrode of the switching triode;
the emitter of the switching triode is grounded, and the collector of the switching triode is respectively connected with one end of the second resistor and one end of the fourth resistor;
the other end of the first resistor is grounded;
the other end of the second resistor is connected with the output end of the measurement and control CPU;
the other end of the fourth resistor is grounded.
Further, the step size with the adjustable second voltage value is a first preset value.
Further, the first preset value is 0.05V.
Further, the pulse width of the high-level pulse signal ranges from 1us to 100us.
Further, the alarm signal is a TTL/CMOS level signal.
Accordingly, a second aspect of the embodiment of the present invention provides a method for detecting a self-checking power supply of a relay protection device, where the self-checking function of the relay protection device is detected by using any one of the above-mentioned detection systems for self-checking functions of the relay protection device, including the following steps:
gradually reducing the second voltage value output by the adjustable power supply;
regulating the pulse width of a high-level pulse signal output by the measurement and control CPU;
detecting an alarm signal output by the relay protection device to be detected through the measurement and control CPU;
and when the alarm signal is received, acquiring the second voltage value and the pulse width of the high-level pulse signal as threshold voltage value and continuous falling time of the power supply self-test of the relay protection device to be tested.
Further, the relay protection device power supply self-checking detection method further comprises the following steps:
adjusting a second voltage value output by the adjustable power supply to be the sum of the threshold voltage value and a second preset value;
the pulse width of the high-level pulse signal output by the measurement and control CPU is adjusted to be the difference between the continuous falling time and a third preset value;
controlling the measurement and control CPU to continuously output a plurality of high-level pulse signals at preset time intervals;
detecting alarm signals output by the relay protection device to be detected, and recording the number of the alarm signals;
and judging the reliability of the power self-checking function of the relay protection device to be tested according to the number of the high-level pulse signals and the number of the alarm signals.
Further, the second preset value is 0.1V; and/or
The third preset value is 1us.
The technical scheme provided by the embodiment of the invention has the following beneficial technical effects:
by adjusting the input voltage and the duration of the relay protection device and detecting the alarm signals output by the corresponding relay protection device, the threshold voltage value and the duration drop time of the self-checking of the power supply of the relay protection device are detected, the reliability of the self-checking function of the power supply of the relay protection device is further detected, the accuracy and the reliability of the detection of the self-checking function of the power supply of the relay protection device are improved, and the running stability of the relay protection device and the power system is improved.
Drawings
FIG. 1 is a schematic diagram of a power self-checking function detection system of a relay protection device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a switching module according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting a self-checking function of a power supply of a relay protection device according to an embodiment of the present invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Fig. 1 is a schematic diagram of a power self-checking function detection system of a relay protection device according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a switching module according to an embodiment of the invention.
Referring to fig. 1 and 2, a first aspect of an embodiment of the present invention provides a power self-checking function detection system of a relay protection device, including: an adjustable power supply, a switching module and a measurement and control CPU; the switching module is respectively and electrically connected with the adjustable power supply, the measurement and control CPU and the relay protection device to be measured; the adjustable power supply outputs a first voltage and a second voltage to the switching module, wherein the value of the second voltage is adjustable and smaller than that of the first voltage; the measurement and control CPU adjusts the voltage value output by the switching module to the relay protection device from a first voltage value to a second voltage value through a high-level pulse signal, wherein the width of the high-level pulse signal is adjustable; the measurement and control CPU is also electrically connected with the relay protection device, acquires an alarm signal of the relay protection device when the second voltage value is lower than the threshold voltage value, and detects a power self-checking function of the relay protection device according to the alarm signal and the high-level pulse signal.
Specifically, the measurement and control CPU detects the power self-checking function of the relay protection device by comparing the receiving time of the alarm signal with the triggering time of the high-level pulse signal and/or comparing the duration time of the alarm signal with the pulse width of the high-level pulse signal.
Specifically, the switching module includes: the first PMOS tube, the second PMOS tube, the switching triode, the first resistor, the second resistor, the third resistor and the fourth resistor. The source electrode of the first PMOS tube is respectively connected with one end of the first voltage source and one end of the third resistor, the grid electrode of the first PMOS tube is respectively connected with one end of the first resistor and the output end of the measurement and control CPU, and the drain electrode of the first PMOS tube is respectively connected with the input end of the relay protection device and the drain electrode of the second PMOS tube; the source electrode of the second PMOS tube is connected with a second voltage source, and the grid electrode of the second PMOS tube is respectively connected with the other end of the third resistor and the collector electrode of the switching triode; the emitter of the switching triode is grounded, and the collector of the switching triode is respectively connected with one end of the second resistor and one end of the fourth resistor; the other end of the first resistor is grounded; the other end of the second resistor is connected with the output end of the measurement and control CPU; the other end of the fourth resistor is grounded.
As shown in fig. 2, the switching circuit includes two synchronous PMOS switching transistors, four resistors and a triode, and specifically functions as follows:
the first PMOS tube Q1 is a PMOS tube for 1 st power supply switching, the S electrode of the first PMOS tube Q1 is connected with a VCC1 digital power supply output by an adjustable power supply, the G electrode is connected with one end of a first resistor R1 and the pulse output end of a measurement and control CPU, and the D electrode is connected with the power input end (VCC) of a relay protection device to be measured and the D electrode of a second PMOS tube Q2.
The second PMOS tube Q2 is a PMOS tube for switching the 2 nd power supply, the S electrode of the second PMOS tube is connected with a VCC2 digital power supply output by an adjustable power supply, the G electrode is connected with one end of a third resistor R3 and the collector electrode of a switching triode Q3, and the D electrode is connected with the power supply input end (VCC) of the relay protection device and the D electrode of the first PMOS tube Q1.
The switching triode Q3 is an NPN triode for controlling the on-off of the tube of the second PMOS tube Q2, the collector electrode of the switching triode Q3 is connected with one end of the third resistor R3 and the G electrode of the second PMOS tube Q2, the emitter electrode of the switching triode Q3 is connected with GND, and the base electrode of the switching triode Q is connected with one end of the second resistor R2.
The first resistor R1 is a pull-down resistor for fixedly detecting that the tube G of the first PMOS tube Q1 is at a low level in an initial state, one end of the pull-down resistor is connected with the pulse output end of the measurement and control CPU and the G pole of the first PMOS tube Q1, and the other end of the pull-down resistor is connected with the GND.
The second resistor R2 is a base current limiting resistor of the switching triode Q3, one end of the second resistor R is connected with the base of the switching triode Q3, and the other end of the second resistor R is connected with the pulse output end of the measurement and control CPU.
The third resistor R3 is a collector pull-up resistor of the switching triode Q3, ensures that the switching triode Q3 can be saturated on and off, changes the level state of the G pole of the second PMOS tube Q2, has one end connected with the first voltage VCC1, and has the other end connected with the collector of the triode Q3 and the G pole of the Q2.
The fourth resistor R4 is a base pull-down resistor of the switching triode Q3, so that the anti-interference capability of the switching triode Q3 is ensured, one end of the fourth resistor R4 is connected with the base of the switching triode Q3, and the other end of the fourth resistor R is connected with GND.
Specifically, the step size of the second voltage value which is adjustable is a first preset value. Optionally, the first preset value is 0.05V.
Specifically, the pulse width of the high-level pulse signal ranges from 1us to 100us.
In addition, the alarm signal is TTL/CMOS level signal.
Specifically, in the initial state of the relay protection device power supply self-checking function detection system, the adjustable power supply outputs a first voltage VCC1 and a second voltage VCC2, the potential VCC1 is greater than VCC2, the pulse output end of the measurement and control CPU outputs a low level, and at this time, the V of the first PMOS transistor Q1 GS-Q1 ＜V GS(th) (V GS(th) A conducting gate threshold of the PMOS, wherein a typical value is a negative potential), the first PMOS tube Q1 is conducted, and the first voltage VCC1 supplies power to the relay protection device to be tested; meanwhile, the base electrode of the switching triode Q3 is connected to the pulse output end of the measurement and control CPU, the potential of the base electrode is low level, Q3 is cut off, and the potential of the G electrode of Q2 is equal to VCC1; then V GS-Q2 ＝VCC1-VCC2＞0＞V GS(th) The second PMOS tube Q2 is cut off, and the power supply VCC=VCC1 of the relay protection device to be tested in the initial state.
In the switching state, the pulse output end of the measurement and control CPU sends out a high-level pulse signal, the high-level value of which is VCC1, and the pulse width t d V of Q1 pipe at this time GS-Q1 ＞V GS(th) Q1 pipe is cut off, VCC1 is disconnected for relay protection device that awaits measuringSetting power supply; at the same time, the base electrode of Q3 is high level, so that Q3 is saturated and conducted, the G pole voltage of Q2 tube is clamped to 0V by Q3, then V of Q2 tube GS-Q2 ＝0-VCC2＜V GS(th) The Q2 pipe is conducted, and the power VCC=VCC2 of the relay protection device to be tested; when the high-level pulse output by the measurement and control CPU disappears, the circuit returns to the initial state again, and the power supply VCC=VCC1 of the relay protection device to be measured. In the detection state, the voltage of the power supply VCC of the relay protection device to be detected drops from VCC1 to VCC2, then rises back to VCC1, and the duration is t d ，t d The time for falling the power supply of the relay protection device to be tested is obtained.
Fig. 3 is a flowchart of a method for detecting a self-checking function of a power supply of a relay protection device according to an embodiment of the present invention.
Accordingly, referring to fig. 3, a second aspect of the embodiment of the present invention provides a method for detecting a self-checking function of a power supply of a relay protection device, where the self-checking function of the power supply of the relay protection device is detected by any one of the above-mentioned self-checking function detection systems of the power supply of the relay protection device, including the following steps:
s100, gradually reducing a second voltage value output by the adjustable power supply.
S200, regulating the pulse width of a high-level pulse signal output by the measurement and control CPU.
S300, detecting an alarm signal output by the relay protection device to be detected through the measurement and control CPU.
And S400, when the alarm signal is received, acquiring a second voltage value and the pulse width of the high-level pulse signal, and taking the second voltage value and the pulse width of the high-level pulse signal as threshold voltage value and continuous falling time of the power supply self-test of the relay protection device to be tested.
In the self-checking judging state, the adjustable power supply adjusts the power supply of VCC2 through the power supply change step length (0.05V), and the measurement and control CPU controls the pulse width t through software d When the adjustment reaches VCC 2=vcc 3, the pulse width t d ＝t w When the power supply self-checking error alarm of the relay protection device to be tested is triggered, the relay protection device to be tested sends out an alarm signal, the measurement and control CPU reads back, and the power supply self-checking parameters of the relay protection device to be tested are VCC3 and t w 。
In one implementation manner of this embodiment, the method for detecting a power self-checking function of the relay protection device further includes:
s510, adjusting the second voltage value output by the adjustable power supply to be the sum of the threshold voltage value and a second preset value.
S520, the pulse width of the high-level pulse signal output by the measurement and control CPU is adjusted to be the difference between the continuous falling time and the third preset value.
S530, controlling the measurement and control CPU to continuously output a plurality of high-level pulse signals at preset time intervals.
S540, detecting alarm signals output by the relay protection device to be detected, and recording the number of the alarm signals.
S550, judging the reliability of the power self-checking function of the relay protection device to be tested according to the number of the high-level pulse signals and the number of the alarm signals.
Specifically, the second preset value is 0.1V; and/or the third preset value is 1us.
Reliability judgment, after finding out the alarming threshold value of 'power self-checking error', setting the voltage value of VCC2 as VCC2=VCC3+0.1V, and setting the pulse width of measurement and control CPU as t d ＝t w And 1us, the measurement and control CPU polls and sends out a pulse output signal to perform a long-term copying test, and simultaneously, the alarm output of the relay protection device to be measured is read back for counting, and the self-checking reliability of the power supply of the relay protection device to be measured is evaluated through the counting proportion.
The embodiment of the invention aims to protect a detection system and a detection method for a self-checking function of a relay protection device power supply, wherein the detection system comprises the following components: an adjustable power supply, a switching module and a measurement and control CPU; the switching module is respectively and electrically connected with the adjustable power supply, the measurement and control CPU and the relay protection device to be measured; the adjustable power supply outputs a first voltage and a second voltage to the switching module, wherein the value of the second voltage is adjustable and smaller than that of the first voltage; the measurement and control CPU adjusts the voltage value output by the switching module to the relay protection device from a first voltage value to a second voltage value through a high-level pulse signal, wherein the width of the high-level pulse signal is adjustable; the measurement and control CPU is also electrically connected with the relay protection device, acquires an alarm signal of the relay protection device when the second voltage value is lower than the threshold voltage value, and detects a power self-checking function of the relay protection device according to the alarm signal and the high-level pulse signal. The technical scheme has the following effects:
by adjusting the input voltage and the duration of the relay protection device and detecting the alarm signals output by the corresponding relay protection device, the threshold voltage value and the duration drop time of the self-checking of the power supply of the relay protection device are detected, the reliability of the self-checking function of the power supply of the relay protection device is further detected, the accuracy and the reliability of the detection of the self-checking function of the power supply of the relay protection device are improved, and the running stability of the relay protection device and the power system is improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (9)
1. A relay protection device power self-checking function detecting system is characterized by comprising: an adjustable power supply, a switching module and a measurement and control CPU;
the switching module is respectively and electrically connected with the adjustable power supply, the measurement and control CPU and the relay protection device to be measured;
the adjustable power supply outputs a first voltage and a second voltage to the switching module, wherein the second voltage value is adjustable and smaller than the first voltage value;
the measurement and control CPU adjusts the voltage value output by the switching module to the relay protection device from the first voltage value to the second voltage value through a high-level pulse signal, wherein the width of the high-level pulse signal is adjustable;
the measurement and control CPU is also electrically connected with the relay protection device, and acquires an alarm signal of the relay protection device when the second voltage value is lower than a threshold voltage value, and detects a power supply self-checking function of the relay protection device according to the alarm signal and the high-level pulse signal;
and the measurement and control CPU detects the power supply self-checking function of the relay protection device by comparing the receiving time of the alarm signal with the triggering time of the high-level pulse signal and/or comparing the duration time of the alarm signal with the pulse width of the high-level pulse signal.
2. The power self-checking function detecting system of a relay protection device according to claim 1, wherein,
the switching module comprises: the first PMOS tube, the second PMOS tube, the switching triode, the first resistor, the second resistor, the third resistor and the fourth resistor;
the source electrode of the first PMOS tube is respectively connected with one end of the first voltage source and one end of the third resistor, the grid electrode of the first PMOS tube is respectively connected with one end of the first resistor and the output end of the measurement and control CPU, and the drain electrode of the first PMOS tube is respectively connected with the input end of the relay protection device and the drain electrode of the second PMOS tube;
the source electrode of the second PMOS tube is connected with a second voltage source, and the grid electrode of the second PMOS tube is respectively connected with the other end of the third resistor and the collector electrode of the switching triode;
the emitter of the switching triode is grounded, and the collector of the switching triode is respectively connected with one end of the second resistor and one end of the fourth resistor;
the other end of the first resistor is grounded;
the other end of the second resistor is connected with the output end of the measurement and control CPU;
the other end of the fourth resistor is grounded.
3. The power self-checking function detecting system of a relay protection device according to claim 1, wherein,
the step length of the second voltage value which is adjustable is a first preset value.
4. The power self-checking function detecting system of a relay protection device according to claim 3, wherein,
the first preset value is 0.05V.
5. The power self-checking function detecting system of a relay protection device according to claim 1, wherein,
the pulse width range of the high-level pulse signal is 1us-100us.
6. The power self-checking function detecting system of a relay protection device according to claim 1, wherein,
the alarm signal is TTL/CMOS level signal.
7. The method for detecting the self-checking function of the power supply of the relay protection device is characterized by comprising the following steps of:
gradually reducing the second voltage value output by the adjustable power supply;
regulating the pulse width of a high-level pulse signal output by the measurement and control CPU;
detecting an alarm signal output by the relay protection device to be detected through the measurement and control CPU;
and when the alarm signal is received, acquiring the second voltage value and the pulse width of the high-level pulse signal as threshold voltage value and continuous falling time of the power supply self-test of the relay protection device to be tested.
8. The method for detecting a power self-checking function of a relay protection device according to claim 7, further comprising:
adjusting a second voltage value output by the adjustable power supply to be the sum of the threshold voltage value and a second preset value;
the pulse width of the high-level pulse signal output by the measurement and control CPU is adjusted to be the difference between the continuous falling time and a third preset value;
controlling the measurement and control CPU to continuously output a plurality of high-level pulse signals at preset time intervals;
detecting alarm signals output by the relay protection device to be detected, and recording the number of the alarm signals;
and judging the reliability of the power self-checking function of the relay protection device to be tested according to the number of the high-level pulse signals and the number of the alarm signals.
9. The method for detecting the self-checking function of the power supply of the relay protection device according to claim 8, wherein,
the second preset value is 0.1V; and/or
The third preset value is 1us.
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