CN115112970A - Method and system for monitoring state of pressure plate at outlet of relay protection operation loop - Google Patents
Method and system for monitoring state of pressure plate at outlet of relay protection operation loop Download PDFInfo
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a method and a system for monitoring the state of an outlet pressing plate of a relay protection operation loop, wherein the method comprises the following steps: step 1, constructing a voltage monitoring loop, and connecting the voltage monitoring loop in parallel to an outlet pressure plate to obtain the actual voltage of a measuring point; step 2, calculating the internal resistance of a tripping coil and the internal resistance of a closing coil according to the voltage of the tripping and closing coil; step 3, acquiring theoretical voltages at two ends of the outlet pressing plate in a tripping state according to the internal resistance of the tripping coil; step 4, acquiring theoretical voltages at two ends of the outlet pressing plate in a closing state according to the internal resistance of the closing coil; and 5, judging the state of the outlet pressure plate by combining the actual voltage and the theoretical voltage of the measuring point in the tripping state or the closing state respectively. The invention realizes the monitoring of the state of the outlet pressing plate through the electrical characteristics of the outlet pressing plate, can remotely monitor the hard pressing plate of the relay protection device in real time, and does not influence the normal work of the relay protection operation loop.
Description
Technical Field
The invention relates to the technical field of power system fault detection, in particular to a method and a system for monitoring the state of a pressure plate at an outlet of a relay protection operation loop.
Background
The equipment of the power system transformer substation comprises primary equipment and secondary equipment, wherein the secondary equipment is various devices for controlling, measuring and protecting the primary equipment, most of the conventional transformer substations are unattended, and after the states of the primary equipment and the secondary equipment are collected by the protection and measurement and control device, the states are transmitted to a remote monitoring center by a telecontrol device of an automatic system, so that the equipment can be remotely monitored.
The relay protection device is the most main secondary equipment of a transformer substation and is used for controlling and protecting primary equipment such as a circuit breaker, a transformer and the like, and the mounting screen cabinet of the relay protection device is provided with connecting sheets (hard pressing plates) capable of being switched on and off for switching on or switching off an external circuit or switching on and switching off functions in order to facilitate switching on and off, operation and adaptation to various operation modes. In practical application, it is important to correctly throw and withdraw the hard pressing plate, and the protection is possibly refused to operate and is wrongly operated by throwing or misthrowing the hard pressing plate, so that serious consequences are brought.
The defects of the prior art are as follows: because the hard pressing plate is connected in series in each external circuit, the state of the hard pressing plate cannot be directly obtained from the circuit, and each equipment manufacturer does not collect the state of the hard pressing plate, the hard pressing plate cannot be remotely monitored, and only operation and maintenance personnel can regularly patrol and inspect the hard pressing plate. In actual work, relay protection refusal and misoperation events caused by missed and wrong operation of the pressing plate are frequent, so that how to acquire the state of the hard pressing plate is researched, online monitoring of the state of the pressing plate is realized, and the method has important significance for the field of power system fault detection. The prior art provides a hard clamp plate remote monitoring device of relay protection (CN205610350U), through monitoring hard clamp plate open and shut state, avoids hard clamp plate miscutting or neglected throw, the security of improve equipment operation. The proximity type electromagnetic sensor is adopted for measurement, and the electromagnetic sensor has self stability difference and is inconvenient to install in the actual use process.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for monitoring the state of a pressure plate at the outlet of a relay protection operation loop, which can realize state acquisition and remote monitoring of a hard pressure plate by using the existing resources of a transformer substation.
The invention adopts the following technical scheme.
A state monitoring method for an outlet pressure plate of a relay protection operation loop comprises the following steps:
and 5, judging the state of the outlet pressure plate by combining the actual voltage and the theoretical voltage of the measuring point in the tripping state or the closing state respectively.
Preferably, in the step 1,
the voltage monitoring circuit also comprises an access terminal circuit, a voltage division and current limiting resistance circuit, an AD collector circuit and an MCU calculation circuit, and the measuring point is the point of alignment of the upper end and the lower end of an outlet pressure plate of the relay protection operation circuit.
Preferably, the step 2 further comprises:
step 2-1, arranging a voltage acquisition device at a key node of a relay protection operation loop, and acquiring the voltage of each key node;
and 2-2, calculating the internal resistance values of the tripping coil and the brake coil.
Preferably, the step 2-2 further comprises:
let total impedance of trip loop be R TZ And then, the calculation formula of the internal resistance of the tripping coil is as follows:
R TQ ＝V TQ /(V KM+ -V KM- )*R TZ
wherein R is TQ Indicating the internal resistance of the trip coil;
setting total impedance of a switching-on loop as R HZ And then, the calculation formula of the internal resistance of the closing coil is as follows:
R HQ ＝V TQ /(V KM+ -V KM- )*R HZ
wherein R is HQ Indicating the internal resistance of the closing coil.
Preferably, said step 3 further comprises the step of,
the theoretical voltage calculation formula at the two ends of the outlet pressure plate in the tripping state is as follows:
U LPKM+ ＝-U n ·R/(R+R TQ )
U LPKM- ＝-U n ·R/(R+R TQ +R LP )
wherein, U LPKM+ For the near-operating circuit of the outlet pressure platePositive terminal voltage, U LPKM- The voltage of the outlet pressure plate near the negative end of the operation loop, R is the internal resistance of the voltage monitoring loop, Un is the rated voltage of the operation loop, R TQ To trip the internal resistance of the coil, R LP Is the contact resistance of the outlet platen.
Preferably, the step 4 further comprises:
the theoretical voltage calculation formula at the two ends of the outlet pressure plate under the closing state is as follows:
U LPKM+ ＝-U n ·R/(R+R HQ )
U LPKM- ＝-U n ·R/(R+R HQ +R LP )
wherein, U LPKM+ Is the positive end voltage, U, of the near-operation loop of the outlet pressure plate LPKM- For the negative terminal voltage of the outlet pressure plate near-operation loop, R is the internal resistance of the voltage monitoring loop, U n Rated voltage, R, for operating the circuit HQ For internal resistance of switching-on coil, R LP Is the contact resistance of the outlet platen.
Preferably, the step 5 further comprises
Step 5-1, acquiring the actual voltage of the measuring point through a voltage monitoring loop;
step 5-2, judging whether the outlet pressing plate is put into use or not by combining the error between the theoretical voltage and the actual voltage;
and 5-3, if the outlet pressing plate is put into use, judging whether the outlet pressing plate is connected well or not by combining the difference value of the theoretical voltage and the measured voltage.
Preferably, the step 5-2 further comprises:
the judgment formula of whether the outlet pressing plate is put into use is as follows:
|(U-U LPKM- )/U|*100％＜10％
wherein U is the actual voltage of the measuring point;
if the relay protection operation loop is in a trip state, determining U in the formula LPKM- The voltage of the negative end of the outlet pressing plate near-operation loop in the tripping state is calculated in the step 3;
if the relay protection operation loop is in a closing state, judging U in the formula LPKM- For calculation in step 4Obtaining the voltage of the negative terminal of the outlet pressure plate near-operation loop in the closing state;
and when the measured voltage meets the judgment formula, the pressing plate is determined to be put into use, otherwise, the pressing plate is not determined to be put into use.
Preferably, the step 5-3 further comprises:
judge whether the export clamp plate is connected perfectly still include:
for a 220V direct current system, judging whether the difference value between the theoretical voltage and the measured voltage meets the following requirements:
U-U LPKM+ ≤22
if so, indicating that the outlet pressing plate is connected perfectly, otherwise, indicating that the outlet pressing plate is not connected perfectly;
for a 110V direct current system, judging whether the difference value between the theoretical voltage and the measured voltage meets the following conditions:
U-U LPKM+ ≤11
if the pressure difference meets the requirement, the outlet pressure plate is connected perfectly, otherwise, the outlet pressure plate is not connected perfectly.
The invention also provides a system for monitoring the state of the pressure plate at the outlet of the relay protection operation loop, which comprises an acquisition module, a calculation module and a judgment module;
the acquisition module is used for acquiring the actual voltage of a measuring point and the key node voltage of a relay protection operation loop, and further comprises a voltage monitoring loop and a voltage acquisition device;
the calculation module is used for calculating theoretical voltage of the measuring point, and the calculation module can calculate according to parameters of the operation loop and the voltage monitoring module to obtain the theoretical voltage and use the theoretical voltage for subsequent judgment;
the judgment module judges whether the outlet pressing plate is put into use and whether the connection is intact according to the voltage of the measuring point acquired by the acquisition module and the theoretical voltage acquired by the calculation module.
Compared with the prior art, the method has the advantages that the outlet pressing plate of the relay protection operation circuit is monitored based on the voltage relation, the linear expression of the state of the outlet pressing plate is realized only by the electrical characteristics of the outlet pressing plate in the monitoring process, the remote real-time monitoring of the hard pressing plate of the relay protection device can be realized, and the normal work of the relay protection operation circuit is not influenced.
Drawings
FIG. 1 is a schematic overall flow chart of a method for monitoring the state of an outlet pressure plate of a relay protection operation loop according to the present invention;
FIG. 2 is a schematic diagram of the voltage monitoring circuit according to the present invention;
FIG. 3 is a schematic diagram of node voltage monitoring in the present invention;
fig. 4 is a schematic diagram of the overall structure of the pressure plate state monitoring system at the outlet of the relay protection operation loop.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 1, the invention provides a method for monitoring the state of an outlet pressure plate of a relay protection operation loop, which specifically comprises the following steps:
specifically, as shown in fig. 2, the voltage monitoring circuit further includes an access terminal circuit, a voltage dividing and current limiting resistor circuit, an AD collector circuit, and an MCU calculation circuit, and the four circuits are independent circuits.
As shown in fig. 2, firstly, a 130K resistor is connected in series with a 4.99K resistor, and the two resistors are connected in parallel with a 4.99K resistor and connected with a reference point AGND; the voltage division and current limitation resistor loop comprises a resistor, a diode and a capacitor, as shown in fig. 2, two 10K resistors are connected in series with a capacitor of 1nF and then connected in parallel with the diode, and one end of the diode is connected with a reference point AGND; the AD collector loop comprises an AD collecting chip; the MCU calculation loop comprises a microcomputer and is used for calculating the acquired voltage data.
The voltage monitoring circuit can be connected to one end of an outlet pressure plate of the relay protection operation circuit in parallel, and can also be connected to two ends of the outlet pressure plate in parallel. As shown IN fig. 2, fig. 2 includes four voltage monitoring loops, and the ports of each voltage monitoring loop IN fig. 2 connected IN parallel with the outlet platen are a first port HLP _1_ IN, a second port HLP _2_ IN, a third TLP _1_ IN and a fourth port TLP _2_ IN.
As shown in fig. 3, the actual voltage of the measurement point is obtained by the voltage monitoring circuit, and in this embodiment, the measurement point is the point of alignment between the upper end and the lower end of the outlet pressure plate of the relay protection operation circuit. As shown IN fig. 2 and 3, the first port HLP _1_ IN is connected to the outlet platen at point B, and the third port TLP _1_ IN is connected to the outlet platen at point B1, as measured.
specifically, step 2 further includes:
step 2-1, arranging a voltage acquisition device at key nodes of a relay protection operation loop, and acquiring voltages of the key nodes;
the key node comprises a direct current loop positive end, a tripping coil and a direct current loop negative end, the apparent tripping outlet loop is a two-port network, and the obtained key node voltage of the operation loop comprises a direct current loop positive end voltage V KM+ Trip coil voltage V TQ And negative terminal V of DC circuit KM- 。
And 2-2, calculating the internal resistance values of the tripping coil and the brake coil.
Using reference point as V KM- For example, when the device is in a closing state, a trip coil node TQ of the operating mechanism is in a closing state, and the trip coil node TQ is communicated with a negative end KM-of a direct current loop;
let total trip loop impedance be R TZ And then, the calculation formula of the internal resistance of the tripping coil is as follows:
R TQ ＝V TQ /(V KM+ -V KM- )*R TZ
wherein R is TQ Indicating the internal resistance of the trip coil.
Setting total impedance of a switching-on loop to be R HZ And then, the calculation formula of the internal resistance of the closing coil is as follows:
R HQ ＝V TQ /(V KM+ -V KM- )*R HZ
wherein R is HQ Indicating the internal resistance of the closing coil.
the theoretical voltages at the two ends of the outlet pressing plate comprise a positive end voltage and a negative end voltage of the outlet pressing plate near operation loop, and the calculation of the theoretical voltages at the two ends of the outlet pressing plate in a tripping state relates to the resistance value of the tripping coil and the contact resistance of the outlet pressing plate. The automatic tripping device is characterized in that whether the outlet pressing plate is put into use or not can be judged, and whether the connection between the outlet pressing plate and the tripping coil is complete or not can be judged, for example, whether the outlet pressing plate rotates in place or not and whether virtual connection exists or not can be judged.
Specifically, the rated voltage of the operation loop is set as U n The DC impedance of the trip coil is R TQ The contact resistance of the outlet pressure plate is R LP And the rated voltage of the operation loop is U n In known amounts.
In the voltage monitoring loop constructed in step 1, the internal resistance of the loop is designed to be high impedance, so as to effectively avoid the influence of parallel measurement, the internal resistance is R, and the internal resistance R is a current limiting resistance, as shown in fig. 2, the internal resistance R of the voltage monitoring loop is R154 in fig. 2, the resistance value is set to be more than 130k Ω, and the internal resistance R is set to be 130k Ω in this embodiment.
According to the internal resistance R of the voltage monitoring loop, the rated voltage Un of the operation loop and the internal resistance R of the tripping coil TQ Contact resistance R with outlet pressure plate LP And (3) calculating theoretical voltages at two ends of the outlet pressure plate close to the operation loop, wherein the calculation formula is as follows:
U LPKM+ ＝-U n ·R/(R+R TQ )
U LPKM- ＝-U n ·R/(R+R TQ +R LP )
wherein, U LPKM+ Is the positive end voltage, U, of the near-operation loop of the outlet pressure plate LPKM- The outlet platen is near the negative terminal voltage of the operating circuit.
the calculation of the theoretical voltage of the closing pressing plate relates to the resistance value of the closing coil and the contact resistance of the outlet pressing plate. Whether the outlet pressing plate is put into or not can be judged through the value of the theoretical voltage of the closing pressing plate, and whether the connection of the outlet pressing plate is intact or not can also be judged.
Setting the rated voltage of the operation loop as U n The internal resistance of the closing coil is R HQ The contact resistance of the outlet platen is R LP Then, the theoretical value of the potential at the two ends of the outlet pressure plate is calculated as follows:
U LPKM+ ＝-U n ·R/(R+R HQ )
U LPKM- ＝-U n ·R/(R+R HQ +R LP )
wherein, U LPKM+ For the positive terminal voltage, U, of the near-operating circuit of the outlet pressure plate LPKM- The outlet platen near the negative end of the operating loop is at voltage.
Step 5, judging the state of the outlet pressure plate by combining the actual voltage and the theoretical voltage of the measuring point in a tripping state or a closing state respectively;
specifically, the judgment that the obtained state of the outlet pressing plate includes whether the outlet pressing plate is put into use or not and whether the outlet pressing plate is connected perfectly or not, and the step 5 further includes:
step 5-1, acquiring the actual voltage of the measuring point through a voltage monitoring loop;
step 5-2, judging whether the outlet pressing plate is put into use or not by combining the error between the theoretical voltage and the actual voltage;
specifically, each component in the operating loop has its own impedance, and thus, a voltage division effect exists. Meanwhile, because parasitic loops, virtual connections and other phenomena exist, the actual voltage is not equal to a theoretical value but is smaller than the theoretical value, so that the invention comprises the following steps:
and when the error between the measured voltage and the theoretical calculated voltage is less than 10%, the outlet pressure plate is determined to be reliably put into use. Therefore, the judgment formula of whether the outlet pressure plate is used or not in the invention is as follows:
|(U-U LPKM- )/U|*100％＜10％
wherein, U is the actual voltage of the measuring point.
If the relay protection operation loop is in a trip state, determining U in the formula LPKM- The voltage of the negative end of the outlet pressing plate near-operation loop in the tripping state is calculated in the step 3;
if the relay protection operation loop is in a closing state, judging U in the formula LPKM- The voltage of the negative end of the outlet pressing plate near operation loop in the closing state calculated in the step 4 is obtained;
and when the measured voltage meets the judgment formula, the pressing plate is determined to be put into use, otherwise, the pressing plate is not determined to be put into use.
And 5-3, if the outlet pressing plate is put into use, judging whether the outlet pressing plate is connected perfectly by combining the difference value of the theoretical voltage and the measured voltage.
Specifically, whether it is intact still includes to judge that the export clamp plate is connected:
for a 220V direct current system, judging whether the difference value between the theoretical voltage and the measured voltage meets the following requirements:
U-U LPKM+ ≤22
if so, indicating that the outlet pressing plate is connected perfectly, otherwise, indicating that the outlet pressing plate is not connected perfectly;
for a 110V direct current system, judging whether the difference value between the theoretical voltage and the measured voltage meets the following conditions:
U-U LPKM+ ≤11
if the pressure difference meets the requirement, the outlet pressure plate is connected perfectly, otherwise, the outlet pressure plate is not connected perfectly.
As shown in fig. 4, the present invention further provides a system for monitoring the state of an outlet pressing plate of a relay protection operation loop, wherein the method for monitoring the state of the outlet pressing plate of the relay protection operation loop can be implemented based on the system, and specifically, the system comprises an acquisition module, a calculation module and a judgment module;
the acquisition module is used for acquiring the actual voltage of a measuring point and the key node voltage of a relay protection operation loop, and further comprises a voltage monitoring loop and a voltage acquisition device;
the calculation module is used for calculating theoretical voltage of the measuring point, and the calculation module can calculate according to parameters of the operation loop and the voltage monitoring module to obtain the theoretical voltage and use the theoretical voltage for subsequent judgment;
the judgment module judges whether the outlet pressing plate is put into use and whether the connection is intact according to the voltage of the measuring point acquired by the acquisition module and the theoretical voltage acquired by the calculation module.
Compared with the prior art, the invention has the advantages that the state of the outlet pressing plate is monitored through the electrical characteristics of the outlet pressing plate, the hard pressing plate of the relay protection device can be remotely monitored in real time, and the normal work of a relay protection operation circuit is not influenced.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. A state monitoring method for an outlet pressure plate of a relay protection operation loop is characterized by comprising the following steps:
step 1, constructing a voltage monitoring loop, and connecting the voltage monitoring loop in parallel to an outlet pressure plate of a relay protection operation loop to obtain actual voltage of a measuring point;
step 2, obtaining the voltage of a key node of the operation loop, and calculating the internal resistance of a tripping coil and the internal resistance of a closing coil;
step 3, acquiring theoretical voltages at two ends of the outlet pressing plate in a tripping state according to the internal resistance of the tripping coil;
step 4, acquiring theoretical voltages at two ends of the outlet pressing plate in a closing state according to the internal resistance of the closing coil;
and 5, judging the state of the outlet pressure plate by combining the actual voltage and the theoretical voltage of the measuring point in the tripping state or the closing state respectively.
2. The relay protection operation circuit outlet pressure plate state monitoring method according to claim 1,
the step 2 further comprises:
step 2-1, arranging a voltage acquisition device at a key node of a relay protection operation loop, and acquiring the voltage of each key node;
and 2-2, calculating the internal resistance values of the tripping coil and the brake coil.
3. The method for monitoring the state of an outlet pressure plate of a relay protection operating circuit according to claim 2,
in the step 2-1, the key nodes comprise a direct current loop positive end, a trip coil and a direct current loop negative end, the trip outlet loop is a two-port network, and the obtained key node voltage of the operation loop comprises a direct current loop positive end voltage V KM+ Trip coil voltage V TQ And negative terminal V of DC circuit KM- 。
4. The method for monitoring the state of an outlet pressure plate of a relay protection operating circuit according to claim 3,
the step 2-2 further comprises:
let total impedance of trip loop be R TZ Then, the internal resistance of the trip coil is calculated as follows:
R TQ ＝V TQ /(V KM+ -V KM- )*R TZ
wherein R is TQ Indicating the internal resistance of the trip coil;
setting total impedance of a switching-on loop to be R HZ And then, the calculation formula of the internal resistance of the closing coil is as follows:
R HQ ＝V TQ /(V KM+ -V KM- )*R HZ
wherein R is HQ Indicating the internal resistance of the closing coil.
5. The relay protection operation circuit outlet pressure plate state monitoring method according to claim 4,
the step 3 further comprises the step of,
the theoretical voltage calculation formula of the two ends of the outlet pressure plate in the tripping state is as follows:
U LPKM+ ＝-U n ·R/(R+R TQ )
U LPKM- ＝-U n ·R/(R+R TQ +R LP )
wherein, U LPKM+ For the positive terminal voltage, U, of the near-operating circuit of the outlet pressure plate LPKM- The voltage of the outlet pressure plate near the negative end of the operation loop, R is the internal resistance of the voltage monitoring loop, Un is the rated voltage of the operation loop, R TQ To trip the internal resistance of the coil, R LP Is the contact resistance of the outlet platen.
6. The relay protection operation circuit outlet pressure plate state monitoring method according to claim 4,
the step 4 further comprises:
the theoretical voltage calculation formula at the two ends of the outlet pressure plate under the closing state is as follows:
U LPKM+ ＝-U n ·R/(R+R HQ )
U LPRM- ＝-U n ·R/(R+R HQ +R LP )
wherein, U LPKM+ Is the positive end voltage, U, of the near-operation loop of the outlet pressure plate LPKM- The voltage of the outlet pressure plate near the negative end of the operation loop, R is the internal resistance of the voltage monitoring loop, Un is the rated voltage of the operation loop, R HQ For internal resistance of switching-on coil, R LP Is the contact resistance of the outlet platen.
7. The method for monitoring the state of an outlet pressure plate of a relay protection operating circuit according to claim 6,
the step 5 also comprises
Step 5-1, acquiring the actual voltage of the measuring point through a voltage monitoring loop;
step 5-2, judging whether the outlet pressing plate is put into use or not by combining the error between the theoretical voltage and the actual voltage;
and 5-3, if the outlet pressing plate is put into use, judging whether the outlet pressing plate is connected perfectly by combining the difference value of the theoretical voltage and the measured voltage.
8. The relay protection operation circuit outlet pressure plate state monitoring method according to claim 7,
the step 5-2 further comprises:
the judgment formula of whether the outlet pressing plate is put into use is as follows:
|(U-U LPKM- )/U|*100％＜10％
wherein U is the actual voltage of the measuring point;
if the relay protection operation loop is in a trip state, determining U in the formula LPKM- The theoretical voltage at the two ends of the outlet pressure plate under the tripping state;
if the relay protection operation loop is in a closing state, judging U in the formula LPKM- The theoretical voltage at the two ends of the outlet pressure plate under the closing state;
and when the measured voltage meets the judgment formula, the pressing plate is determined to be put into use, otherwise, the pressing plate is not determined to be put into use.
9. The relay protection operation circuit outlet pressure plate state monitoring method according to claim 8,
the step 5-3 further comprises:
judge whether the export clamp plate is connected perfectly still include:
for a 220V direct current system, judging whether the difference value between the theoretical voltage and the measured voltage meets the following conditions:
U-U LPKM+ ≤22
if so, indicating that the outlet pressing plate is connected perfectly, otherwise, indicating that the outlet pressing plate is not connected perfectly;
for a 110V direct current system, judging whether the difference value between the theoretical voltage and the measured voltage meets the following conditions:
U-U LPKM+ ≤11
if the pressure difference meets the requirement, the outlet pressure plate is connected perfectly, otherwise, the outlet pressure plate is not connected perfectly.
10. A relay protection operation loop outlet pressing plate state monitoring system for realizing the relay protection operation loop outlet pressing plate state monitoring method according to any one of claims 1 to 9 is characterized by comprising an acquisition module, a calculation module and a judgment module;
the acquisition module is used for acquiring the actual voltage of a measuring point and the key node voltage of a relay protection operation loop, and further comprises a voltage monitoring loop and a voltage acquisition device;
the calculation module is used for calculating theoretical voltage of the measuring point, and the calculation module can calculate according to parameters of the operation loop and the voltage monitoring module to obtain the theoretical voltage and use the theoretical voltage for subsequent judgment;
the judgment module judges whether the outlet pressing plate is put into use and whether the connection is intact according to the voltage of the measuring point acquired by the acquisition module and the theoretical voltage acquired by the calculation module.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116381396A (en) * | 2023-06-05 | 2023-07-04 | 广东电网有限责任公司佛山供电局 | Intelligent monitoring system for transformer substation outlet pressing plate |
| CN116774629A (en) * | 2023-06-16 | 2023-09-19 | 国网江苏省电力有限公司泰州供电分公司 | Intelligent monitoring module and method for relay protection outlet loop number |
| CN117233515A (en) * | 2023-11-13 | 2023-12-15 | 广东电网有限责任公司佛山供电局 | Method and system for measuring state of outlet pressing plate |
| CN118259097A (en) * | 2024-03-14 | 2024-06-28 | 北京中科飞龙传感技术有限责任公司 | Method and system for improving non-invasive state monitoring accuracy of hard pressing plate electric field |
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| CN116381396B (en) * | 2023-06-05 | 2023-10-27 | 广东电网有限责任公司佛山供电局 | Intelligent monitoring system for transformer substation outlet pressing plate |
| CN116774629A (en) * | 2023-06-16 | 2023-09-19 | 国网江苏省电力有限公司泰州供电分公司 | Intelligent monitoring module and method for relay protection outlet loop number |
| CN116774629B (en) * | 2023-06-16 | 2024-01-23 | 国网江苏省电力有限公司泰州供电分公司 | Intelligent monitoring module and method for relay protection outlet loop number |
| CN117233515A (en) * | 2023-11-13 | 2023-12-15 | 广东电网有限责任公司佛山供电局 | Method and system for measuring state of outlet pressing plate |
| CN117233515B (en) * | 2023-11-13 | 2024-02-13 | 广东电网有限责任公司佛山供电局 | Method and system for measuring state of outlet pressing plate |
| CN118259097A (en) * | 2024-03-14 | 2024-06-28 | 北京中科飞龙传感技术有限责任公司 | Method and system for improving non-invasive state monitoring accuracy of hard pressing plate electric field |
| CN118259097B (en) * | 2024-03-14 | 2024-09-27 | 北京中科飞龙传感技术有限责任公司 | Method and system for improving non-invasive state monitoring accuracy of hard pressing plate electric field |
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