CN115112970B - Method and system for monitoring state of outlet pressing plate of relay protection operation loop - Google Patents
Method and system for monitoring state of outlet pressing plate of relay protection operation loop Download PDFInfo
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- CN115112970B CN115112970B CN202210597939.5A CN202210597939A CN115112970B CN 115112970 B CN115112970 B CN 115112970B CN 202210597939 A CN202210597939 A CN 202210597939A CN 115112970 B CN115112970 B CN 115112970B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000003071 parasitic effect Effects 0.000 description 1
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
Abstract
The invention discloses a method and a system for monitoring the state of an outlet pressing plate of a relay protection operation circuit, 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 pressing plate to obtain the actual voltage of a measuring point; step 2, calculating the internal resistance of the tripping coil and the internal resistance of the closing coil according to the tripping and closing coil voltage; step 3, according to the internal resistance of the tripping coil, acquiring theoretical voltages at two ends of an outlet pressing plate in a tripping state; step 4, according to the internal resistance of the closing coil, acquiring theoretical voltages at two ends of an outlet pressing plate in a closing state; and 5, judging the state of the outlet pressing plate by combining the actual voltage and the theoretical voltage of the measuring point under the tripping state or the closing state respectively. According to the invention, the state of the outlet pressing plate is monitored through the electrical characteristics of the outlet pressing plate, so that the hard pressing plate of the relay protection device can be monitored remotely in real time, and the normal work of a relay protection operation loop is not influenced.
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 an outlet pressing plate 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 existing transformer substations are unattended, the states of the primary and secondary equipment are collected by the protection and measurement and control devices, and then the primary and secondary equipment are transmitted to a remote monitoring center by a remote device of an automatic system, so that the remote monitoring of the equipment can be realized.
The relay protection device is the most main secondary equipment of the transformer substation and is used for controlling and protecting primary equipment such as a circuit breaker, a transformer and the like, and the relay protection device is provided with a connecting sheet (hard pressing plate) which can be thrown and withdrawn on a screen cabinet for conveniently throwing and withdrawing, operating and adapting to various running modes and is used for realizing the functions of switching on or off an external circuit, throwing and withdrawing and the like. In practical application, it is important to correctly throw and withdraw the hard pressing plate, and the missing throw or the misthrow of the hard pressing plate can cause protection to refuse to act and malfunction, so that serious consequences are brought.
The prior art has the following defects: because the hard press plates are connected in series in each external circuit, the states of the hard press plates cannot be directly obtained from the circuits, and each equipment manufacturer does not collect the states of the hard press plates, so that the hard press plates cannot be monitored remotely and can only be inspected by operation and maintenance personnel periodically. Relay protection refused action and misoperation events caused by missed throwing and misplacement of the pressing plates in actual work are frequent, so that how to collect the state of the hard pressing plates is studied, on-line monitoring of the state of the pressing plates is realized, and the method has important significance in the field of power system fault detection. The prior art provides a relay protection hard clamp plate remote monitoring device (CN 205610350U), through the state of opening and shutting to hard clamp plate, avoids hard clamp plate misthrowing or missing to throw, improves the security of equipment operation. The proximity type electromagnetic induction sensor is adopted for measurement, and the electromagnetic sensor has the stability difference and is inconvenient to install in the actual use process.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide the state monitoring method for the outlet pressing plate of the relay protection operation circuit, which can realize state acquisition and remote monitoring of the hard pressing plate by utilizing the existing resources of the transformer substation.
The invention adopts the following technical scheme.
A method for monitoring the state of an outlet pressing plate of a relay protection operation loop comprises the following steps:
step 1, constructing a voltage monitoring loop, and connecting the voltage monitoring loop in parallel to an outlet pressing plate of a relay protection operation loop to obtain the actual voltage of a measuring point;
step 2, obtaining the voltage of a key node of an operation loop, and calculating the internal resistance of the tripping and closing coil
Step 3, according to the internal resistance of the tripping coil, acquiring theoretical voltages at two ends of an outlet pressing plate in a tripping state;
step 4, according to the internal resistance of the closing coil, acquiring theoretical voltages at two ends of an outlet pressing plate in a closing state;
and 5, judging the state of the outlet pressing plate by combining the actual voltage and the theoretical voltage of the measuring point under the tripping state or the closing state respectively.
Preferably, in the step 1, the step of detecting the position of the object is performed,
the voltage monitoring loop further comprises an access terminal loop, a voltage dividing and current limiting resistor loop, an AD collector loop and an MCU computing loop, and the measuring points are opposite points of the upper end and the lower end of the outlet pressing plate of the relay protection operation loop.
Preferably, the step 2 further includes:
step 2-1, setting a voltage acquisition device at key nodes of a relay protection operation loop, and acquiring the voltage of each key node;
and 2-2, calculating the values of the trip coil internal resistance and the brake coil internal resistance.
Preferably, the step 2-2 further comprises:
let the total impedance of the trip circuit be R TZ The trip coil internal resistance is calculated as follows:
R TQ ＝V TQ /(V KM+ -V KM- )*R TZ
wherein R is TQ Indicating trip coil internal resistance;
let the total impedance of the switching-on loop be R HZ The internal resistance of the closing coil is calculated 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, the step 3 further comprises,
the theoretical voltage calculation formula at both ends of the outlet pressing 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 is LPKM+ For the voltage near the positive end of the operating loop of the outlet pressing plate, U LPKM- For the voltage of the outlet pressing 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 coil internal resistance, R LP Is the contact resistance of the outlet platen.
Preferably, the step 4 further includes:
the theoretical voltage calculation formula at two ends of the outlet pressing plate in 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 is LPKM+ For the voltage near the positive end of the operating loop of the outlet pressing plate, U LPKM- For the voltage of the negative end of the operation loop near the outlet pressing plate, R is the internal resistance of the voltage monitoring loop, U n To operate the loop rated voltage, R HQ For the internal resistance of the closing coil R LP Is the contact resistance of the outlet platen.
Preferably, the step 5 further comprises
Step 5-1, obtaining the actual voltage of a measuring point through a voltage monitoring loop;
step 5-2, judging whether the outlet pressing plate is put into use or not by combining errors of theoretical voltage and 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 tripping state, U in the judgment type LPKM- The voltage of the negative end of the operation loop is close to the outlet pressing plate in the tripping state calculated in the step 3;
if the relay protection operation loop is in a closing state, U in the judgment type LPKM- The voltage of the negative end of the close operation loop of the outlet pressing plate in the closing state calculated in the step 4 is obtained;
and when the measured voltage meets the judgment formula, the pressing plate is considered to be put into use, otherwise, the pressing plate is considered to be not put into use.
Preferably, the step 5-3 further comprises:
judging whether the outlet pressing plate is connected well further comprises:
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 yes, the connection of the outlet pressing plate is good, otherwise, the connection of the outlet pressing plate is not good;
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 connection of the outlet pressing plate is good, the connection of the outlet pressing plate is not good, otherwise, the connection of the outlet pressing plate is not good.
The invention also provides a relay protection operation loop outlet pressing plate state monitoring system, which comprises an acquisition module, a calculation module and a judgment module;
the acquisition module is used for acquiring the actual voltage of the measuring point and the voltage of a key node of the relay protection operation loop, and further comprises a voltage monitoring loop and a voltage acquisition device;
the calculation module is used for calculating the theoretical voltage of the measuring point, and can calculate according to the parameters of the operation loop and the voltage monitoring module to obtain the theoretical voltage and be used for subsequent judgment;
the judging module judges whether the outlet pressing plate is put into use or not and whether the connection is good or not according to the measuring point voltage acquired by the acquisition module and the theoretical voltage acquired by the calculation module.
Compared with the prior art, the invention has the beneficial effects that the outlet pressing plate of the relay protection operation circuit is monitored based on the voltage relation, the state of the outlet pressing plate is linearly expressed 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 diagram of the overall flow of the method for monitoring the status of the outlet platen of the relay protection operation circuit of the present invention;
FIG. 2 is a schematic diagram of a voltage monitoring circuit according to the present invention;
FIG. 3 is a schematic diagram of node voltage monitoring in accordance with the present invention;
fig. 4 is a schematic diagram of the overall structure of the state monitoring system for the outlet pressure plate of the relay protection operation circuit of the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.
As shown in fig. 1, the invention provides a method for monitoring the state of an outlet pressing plate of a relay protection operation circuit, which specifically comprises the following steps:
step 1, constructing a voltage monitoring loop, and connecting the voltage monitoring loop in parallel to an outlet pressing plate of a relay protection operation loop to obtain actual voltage of a measuring point;
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.
The access terminal loop is formed by connecting resistors in series and parallel, as shown in fig. 2, firstly, a 130K resistor and a 4.99K resistor are connected in series, and are connected in parallel with a 4.99K resistor and are connected with a reference point AGND; the voltage dividing and current limiting resistor loop comprises resistors, diodes and capacitors, as shown in fig. 2, two 10K resistors are connected with 1nF capacitors in series and then connected with the diodes in parallel, and one end of each 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 loop can be connected to one end of an outlet pressing plate of the relay protection operation loop in parallel, and can also be connected with two ends of the outlet pressing plate in parallel. As shown in fig. 2, fig. 2 includes four voltage monitoring circuits, and the ports of each voltage monitoring circuit connected in parallel to the outlet platen in fig. 2 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 measuring point is obtained through the voltage monitoring circuit, and in this embodiment, the measuring point is a pair of points at the upper end and the lower end of the outlet pressing plate of the relay protection operation circuit. As shown in fig. 2 and 3, the first port hlp_1_in is connected to the point B on the upper end of the outlet platen during measurement, and the third port tlp_1_in is connected to the point B1 on the lower end of the outlet platen.
Step 2, obtaining the voltage of a key node of an operation loop, and calculating the internal resistance of a tripping and closing coil;
specifically, step 2 further includes:
step 2-1, setting a voltage acquisition device at key nodes of a relay protection operation loop, and acquiring the voltage of each key node;
wherein the key node comprises a direct current loop positive end, a tripping coil and a direct current loop negative end, and the obtained operation loop key node voltage comprises a direct current loop positive end voltage V according to the fact that the tripping outlet loop is a two-port network KM+ Trip coil voltage V TQ And a negative end V of the direct current loop KM- 。
And 2-2, calculating the values of the trip coil internal resistance and the brake coil internal resistance.
With reference point V KM- For example, when the device is in a closed state, the trip coil node TQ of the operating mechanism is in a closed state, at which time the trip coil node TQ is in communication with the negative terminal KM-of the dc loop;
let the total impedance of the trip circuit be R TZ The trip coil internal resistance is calculated as follows:
R TQ ＝V TQ /(V KM+ -V KM- )*R TZ
wherein R is TQ Indicating trip coil internal resistance.
Let the total impedance of the switching-on loop be R HZ The internal resistance of the closing coil is calculated as follows:
R HQ ＝V TQ /(V KM+ -V KM- )*R HZ
wherein R is HQ Indicating the internal resistance of the closing coil.
Step 3, according to the internal resistance of the tripping coil, acquiring theoretical voltages at two ends of an outlet pressing plate in a tripping state;
the theoretical voltages at the two ends of the outlet pressing plate comprise the voltage at the positive end and the voltage at the negative end of the near-operation loop of the outlet pressing plate, 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 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 good or not, for example, whether the outlet pressing plate rotates in place or whether virtual connection exists or not can be judged.
Specifically, let the rated voltage of the operation loop be U n The DC impedance of the tripping coil is R TQ The contact resistance of the outlet pressing plate is R LP And the rated voltage of the operation loop is U n Is a known quantity.
The internal resistance of the voltage monitoring loop constructed in the step 1 is designed to be high impedance, so that the influence of parallel measurement is effectively avoided, the internal resistance is R, the internal resistance R is a current limiting resistor, 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 130kΩ, and the internal resistance R is set to be 130kΩ in the 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 the outlet platen LP Calculating theoretical voltages at two ends of a near-operation loop of the outlet pressing plate, wherein the theoretical voltages are calculated as follows:
U LPKM+ ＝-U n ·R/(R+R TQ )
U LPKM- ＝-U n ·R/(R+R TQ +R LP )
wherein U is LPKM+ For the voltage near the positive end of the operating loop of the outlet pressing plate, U LPKM- Is the voltage of the negative end of the near-operation loop of the outlet pressing plate.
Step 4, determining theoretical voltages at two ends of the outlet pressing plate in a closing state according to the internal resistance of the closing coil;
the calculation of 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. The theoretical voltage value of the closing pressing plate can be used for judging whether the outlet pressing plate is put into operation or not and judging whether the connection of the outlet pressing plate is good or not.
Let the rated voltage of the operating loop be U n The internal resistance of the closing coil is R HQ The contact resistance of the outlet pressing plate is R LP The theoretical value of the potential at both ends of the outlet pressing 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 is LPKM+ For the voltage near the positive end of the operating loop of the outlet pressing plate, U LPKM- Is the voltage of the negative end of the near-operation loop of the outlet pressing plate.
Step 5, judging the state of the outlet pressing plate by combining the actual voltage and the theoretical voltage of the measuring point under the tripping state or the closing state respectively;
specifically, judging whether the outlet pressing plate is put into use or not and whether the outlet pressing plate is connected well or not, step 5 further includes:
step 5-1, obtaining the actual voltage of a measuring point through a voltage monitoring loop;
step 5-2, judging whether the outlet pressing plate is put into use or not by combining errors of theoretical voltage and actual voltage;
specifically, each component has its own impedance in the operating loop, and thus there is a voltage division effect. Meanwhile, because parasitic loops, virtual connections and other phenomena exist, the actual voltage is not equal to the theoretical value, but is smaller than the theoretical value, so that in the invention:
and when the error between the measured voltage and the theoretical calculated voltage is less than 10%, the outlet pressing plate is determined to be reliably put in. Therefore, the judgment formula of whether the outlet pressing plate is put into use 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 tripping state, U in the judgment type LPKM- The voltage of the negative end of the operation loop is close to the outlet pressing plate in the tripping state calculated in the step 3;
if relay protection operationWhen the loop is in a closing state, U in the judgment type LPKM- The voltage of the negative end of the close operation loop of the outlet pressing plate in the closing state calculated in the step 4 is obtained;
and when the measured voltage meets the judgment formula, the pressing plate is considered to be put into use, otherwise, the pressing plate is considered to be not put into use.
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.
Specifically, judging whether the outlet pressing plate is connected well further includes:
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 yes, the connection of the outlet pressing plate is good, otherwise, the connection of the outlet pressing plate is not good;
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 connection of the outlet pressing plate is good, the connection of the outlet pressing plate is not good, otherwise, the connection of the outlet pressing plate is not good.
As shown in fig. 4, the present invention further provides a system for monitoring the state of the outlet pressing plate of the relay protection operation circuit, where the method for monitoring the state of the outlet pressing plate of the relay protection operation circuit can be implemented based on the system, and specifically, the system includes an acquisition module, a calculation module and a judgment module;
the acquisition module is used for acquiring the actual voltage of the measuring point and the voltage of a key node of the relay protection operation loop, and further comprises a voltage monitoring loop and a voltage acquisition device;
the calculation module is used for calculating the theoretical voltage of the measuring point, and can calculate according to the parameters of the operation loop and the voltage monitoring module to obtain the theoretical voltage and be used for subsequent judgment;
the judging module judges whether the outlet pressing plate is put into use or not and whether the connection is good or not according to the measuring point voltage acquired by the acquisition module and the theoretical voltage acquired by the calculation module.
Compared with the prior art, 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 a relay protection operation loop.
While the applicant has described and illustrated the embodiments of the present invention in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only 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 to limit the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.
Claims (8)
1. The method for monitoring the state of the outlet pressing plate of the relay protection operation circuit is characterized by comprising the following steps of:
step 1, constructing a voltage monitoring loop, and connecting the voltage monitoring loop in parallel to an outlet pressing plate of a relay protection operation loop to obtain the actual voltage of a measuring point;
step 2, obtaining the voltage of a key node of an operation loop, and calculating the internal resistance of a tripping coil and the internal resistance of a closing coil;
step 3, according to the internal resistance of the tripping coil, acquiring theoretical voltages at two ends of an outlet pressing plate in a tripping state;
step 4, according to the internal resistance of the closing coil, acquiring theoretical voltages at two ends of an outlet pressing plate in a closing state;
step 5, judging the state of the outlet pressing plate by combining the actual voltage and the theoretical voltage of the measuring point under the tripping state or the closing state respectively;
said step 5 further comprises
Step 5-1, obtaining the actual voltage of a measuring point through a voltage monitoring loop;
step 5-2, judging whether the outlet pressing plate is put into use or not by combining errors of theoretical voltage and actual voltage;
step 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;
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 tripping state, U in the judgment type LPKM- Is the theoretical voltage at the two ends of the outlet pressing plate in the tripping state;
if the relay protection operation loop is in a closing state, U in the judgment type LPKM- Is the theoretical voltage at two ends of the outlet pressing plate in a closing state;
and when the measured voltage meets the judgment formula, the pressing plate is considered to be put into use, otherwise, the pressing plate is considered to be not put into use.
2. The method for monitoring the state of an outlet pressure plate of a relay protection operation circuit according to claim 1, wherein,
the step 2 further includes:
step 2-1, setting a voltage acquisition device at key nodes of a relay protection operation loop, and acquiring the voltage of each key node;
and 2-2, calculating the values of the internal resistances of the tripping coil and the closing coil.
3. The method for monitoring the state of an outlet pressure plate of a relay protection operation circuit according to claim 2, wherein,
in the step 2-1, the key node includes a positive end of the dc loop, a trip coil and a negative end of the dc loop, and the obtained key node voltage of the operation loop includes a positive end voltage V of the dc loop, depending on the trip outlet loop being a two-port network KM+ Trip coil voltage V TQ And the negative end voltage V of the direct current loop KM- 。
4. The method for monitoring the status of an outlet pressure plate of a relay protection operating circuit according to claim 3,
the step 2-2 further comprises:
let the total impedance of the trip circuit be R TZ The trip coil internal resistance is calculated as follows:
R TQ ＝V TQ /(V KM+ -V KM- )*R TZ
wherein R is TQ Indicating trip coil internal resistance;
let the total impedance of the switching-on loop be R HZ The internal resistance of the closing coil is calculated 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 method for monitoring the status of an outlet pressure plate of a relay protection operating circuit according to claim 4, wherein,
the step 3 may further comprise the steps of,
the theoretical voltage calculation formula at both ends of the outlet pressing 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 is LPKM+ For the voltage near the positive end of the operating loop of the outlet pressing plate, U LPKM- For the voltage of the negative end of the operation loop near the outlet pressing plate, R is the internal resistance of the voltage monitoring loop, U n To operate the loop rated voltage, R TQ To trip coil internal resistance, R LP Is the contact resistance of the outlet platen.
6. The method for monitoring the status of an outlet pressure plate of a relay protection operating circuit according to claim 4, wherein,
the step 4 further includes:
the theoretical voltage calculation formula at two ends of the outlet pressing plate in 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 is LPKM+ For the voltage near the positive end of the operating loop of the outlet pressing plate, U LPKM- For the voltage of the negative end of the operation loop near the outlet pressing plate, R is the internal resistance of the voltage monitoring loop, U n To operate the loop rated voltage, R HQ For the internal resistance of the closing 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 operation circuit according to claim 1, wherein,
the step 5-3 further comprises:
judging whether the outlet pressing plate is connected well further comprises:
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 yes, the connection of the outlet pressing plate is good, otherwise, the connection of the outlet pressing plate is not good;
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 connection of the outlet pressing plate is good, the connection of the outlet pressing plate is not good, otherwise, the connection of the outlet pressing plate is not good.
8. A relay protection operation circuit outlet pressure plate state monitoring system for realizing the relay protection operation circuit outlet pressure plate state monitoring method according to any one of claims 1 to 7, which 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 the measuring point and the voltage of a key node of the relay protection operation loop, and further comprises a voltage monitoring loop and a voltage acquisition device;
the calculation module is used for calculating the theoretical voltage of the measuring point, and can calculate according to the parameters of the operation loop and the voltage monitoring module to obtain the theoretical voltage and be used for subsequent judgment;
the judging module judges whether the outlet pressing plate is put into use or not and whether the connection is good or not according to the measuring point voltage acquired by the acquisition module and the theoretical voltage acquired by the calculation module.
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| CN202210597939.5A CN115112970B (en) | 2022-05-27 | 2022-05-27 | Method and system for monitoring state of outlet pressing plate of relay protection operation loop |
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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 |
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