CN116840748B - Polarity detection device and method - Google Patents
Polarity detection device and method Download PDFInfo
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- CN116840748B CN116840748B CN202311108226.9A CN202311108226A CN116840748B CN 116840748 B CN116840748 B CN 116840748B CN 202311108226 A CN202311108226 A CN 202311108226A CN 116840748 B CN116840748 B CN 116840748B
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 27
- 230000001052 transient effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
Classifications
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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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
- G01R19/14—Indicating direction of current; Indicating polarity of voltage
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention relates to the technical field of control and protection systems, and discloses a polarity detection device and method, wherein the polarity detection device comprises the following steps: the direct-current power supply is connected with the primary side of the current transformer, and the current generator is connected with the secondary terminal block of the current transformer cabinet; the direct current power supply is used for detecting the polarity relation of the primary side and the secondary side of the current transformer; the current generator is used for detecting the polarity of the current in the monitoring system; the polarity relation of the primary side and the secondary side of the current transformer, the current phase of the secondary side of the current transformer and the internal current phase of the control and protection system are used for comprehensively evaluating the polarity of the control and protection system. Compared with the current transformer polarity judging method commonly used at present, the method can realize full-chain polarity judgment from the electric primary equipment to the inside of the control and protection system program, avoid the risk of overall polarity judgment error caused by partial link polarity judgment missing, ensure the accuracy of overall polarity judgment and the safety of equipment debugging operation, simplify the polarity judging step and also realize the field personnel operation.
Description
Technical Field
The invention relates to the technical field of control and protection systems, in particular to a polarity detection device and method.
Background
Along with the intelligent development of electrical equipment and the construction of a novel power system, the primary power equipment needs to be more complete and intelligent control and protection system to adapt to the application requirements of flexible regulation and control and fault protection. For example, a thyristor converter valve in high-voltage direct-current transmission needs to be provided with a control system, a grid-connected converter which is widely applied to new energy power generation needs to be provided with the control system, and a relay protection device which is widely applied to a power system needs to be provided with microcomputer protection. The control protection system firstly needs to collect the electrical quantity of primary equipment through a voltage-current transformer, and the polarity of voltage and current judges whether the power equipment can work normally or not according to the correct direct relation, and even affects the safety of the power equipment and the safe operation of a power grid.
The electrical quantity of primary equipment collected by the control and protection system relates to a plurality of links such as transformer wiring, control and protection system collection, board level conversion circuit and the like, and the polarity judgment error of any link can cause the polarity error of the control and protection system, so that the differential protection misoperation in relay protection or the instability of the control system is caused. The polarity judgment method adopted in the field debugging at present can carry out primary and secondary polarity judgment of the transformer and terminal arrangement polarity judgment from a secondary terminal of the transformer to the control and protection system, but the polarity judgment cannot be extended to a logic judgment link of the control and protection system, and is not full-chain polarity judgment, so that great safety risks are brought to subsequent equipment debugging and equipment operation. Therefore, full chain debugging judgment is needed to be carried out on the polarity of the control and protection system, so that the correct polarity and safe equipment debugging operation are ensured.
Disclosure of Invention
In view of the above, the present invention provides a polarity detection device and a polarity detection method, so as to solve the problem of how to perform full-chain polarity detection on a control and protection system.
In a first aspect, the present invention provides a polarity detection device, applied to a control protection system, where the control protection system includes a current transformer and a sampling transformer, the device includes: the direct-current power supply is connected with the primary side of the current transformer, and the current generator is connected with the secondary terminal block of the current transformer cabinet; the direct current power supply is used for detecting the polarity relation of the primary side and the secondary side of the current transformer; the current generator is used for applying detection current to the primary side of the sampling transformer so as to detect the polarity of the current in the control and protection system; the polarity relation of the primary side and the secondary side of the current transformer, the current phase of the secondary side of the current transformer and the internal current phase of the control and protection system are used for comprehensively evaluating the polarity of the control and protection system.
Compared with the current transformer polarity judging method commonly used at present, the method can realize full-chain polarity judgment from the electric primary equipment to the inside of the control and protection system program, avoid the risk of overall polarity judgment error caused by partial link polarity judgment missing, ensure the accuracy of overall polarity judgment and the safety of equipment debugging operation, simplify the polarity judging step and also realize the field personnel operation.
In some alternative embodiments, the polarity detection apparatus further comprises: and the ammeter is connected with the secondary side of the current transformer and is used for changing the current of the secondary side of the current transformer when the direct current power supply is disconnected with the current transformer.
In some alternative embodiments, the polarity detection apparatus further includes: and the current waveform recorder is connected with the current generator and is used for recording the current of the secondary side of the current transformer.
In some alternative embodiments, the polarity detection apparatus further includes: the transient wave recording device of the control and protection system is connected with the secondary side of the sampling transformer and is used for recording the internal current of the control and protection system.
In a second aspect, the present invention provides a polarity detection method, based on any one of the optional embodiments of the first aspect, the method comprising: disconnecting the positive electrode of the direct current and the primary side of the current transformer for preset times; judging the polarity of the primary side and the secondary side of the current transformer according to the forward and reverse bias conditions of the ammeter; the current generator is controlled to stop outputting current, and the polarity of the current in the control and protection system is judged according to the current of the secondary side of the current transformer and the current of the secondary side of the sampling transformer at the moment of stopping outputting the current; and obtaining the polarity of the control and protection system based on the polarity relation of the primary side and the secondary side of the current transformer and the polarity of the current in the control and protection system.
In some optional embodiments, the process of judging the polarities of the primary side and the secondary side of the current transformer according to the forward bias condition of the ammeter comprises the following steps: when the positive electrode of the direct current power supply is not disconnected with the primary side of the current transformer, and when the positive electrode of the direct current power supply is disconnected with the primary side of the current transformer, the deflection direction of the ammeter is the same, and the primary side and the secondary side of the current transformer are polarized; when the positive electrode of the direct current power supply is not disconnected with the primary side of the current transformer, and when the positive electrode of the direct current power supply is disconnected with the primary side of the current transformer, the deflection directions of the ammeter are different, and the primary side and the secondary side of the current transformer are polarity-reduced.
In some alternative embodiments, the process of determining the polarity of the current in the control and protection system includes: judging whether the phase of the secondary side current of the current transformer is the same as the phase of the secondary side current of the sampling transformer; when the current polarities are the same, judging that the polarities of the currents in the control and protection system are the polarities of the currents in the control and protection system; and if the current polarity is different, judging that the polarity of the internal current of the control and protection system is the polarity.
In some alternative embodiments, the process of determining whether the phase of the current transformer secondary current is the same as the phase of the sampling transformer secondary current comprises: when the secondary side current of the current transformer and the secondary side current of the sampling transformer are simultaneously zeroed on the positive half shaft or the negative half shaft, the phases of the secondary side current and the sampling transformer are identical.
In some alternative embodiments, the process of deriving a control and maintenance system polarity includes: when the polarities of the primary side and the secondary side of the current transformer are the same as the polarity of the current in the control and protection system, judging that the control and protection system is the polarity-reducing one; and when the polarities of the primary side and the secondary side of the current transformer are different from the polarities of the current in the control and protection system, judging that the control and protection system is polarized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a control and protection system according to an embodiment of the present invention;
fig. 2 is a composition diagram of a polarity detection device according to an embodiment of the present invention;
FIG. 3 is a flow chart of a polarity detection method according to an embodiment of the invention;
fig. 4 is a schematic flow chart of a polarity detection method according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In this embodiment, a polarity detection device is provided and applied to a control and protection system, and as shown in fig. 1, for example, the control and protection system includes a current transformer and a sampling transformer, where a secondary side of the current transformer is sequentially connected with a primary side of the sampling transformer through a secondary terminal row of a current transformer cabinet, a secondary terminal row of a control and protection screen cabinet, and a terminal row of the sampling transformer.
The polarity detection apparatus of the present embodiment includes: a DC power supply and a current generator. The direct current power supply is connected with the primary side of the current transformer, namely the positive electrode of the direct current power supply is connected with the P1 end of the figure 1, and the negative electrode of the direct current power supply is connected with the P2 end of the figure 1, wherein the direct current power supply can be a dry battery. The current generator is connected with the secondary terminal block of the current transformer cabinet, wherein the current generator is used for generating sinusoidal 50Hz alternating current in a current loop.
The direct current power supply of the embodiment is used for detecting the polarity relation of the primary side and the secondary side of the current transformer; specifically, in this embodiment, the connection between the positive electrode of the direct current power supply and the current transformer is disconnected, and the primary side and the secondary side of the current transformer are judged by observing the current change condition of the secondary side of the current transformer. For example: the positive terminal of the ammeter is connected to the S1 end of the chart 1, the negative terminal of the ammeter is connected to the S2 end of the chart 1, the P1 terminal of the current transformer and the positive electrode of the direct current power supply are connected and disconnected for a plurality of times, the current loop is polarity-reduced if the ammeter is forward biased during each connection, and the current loop is polarity-added if the ammeter is reverse biased during connection.
The current generator of the embodiment is used for detecting the polarity of the internal current of the protection system; specifically, in this embodiment, the current generator is controlled to stop applying current, and by observing the moment of stopping applying current, it is determined whether the phase of the secondary side current of the current transformer is the same as the phase of the secondary side current of the sampling transformer, if so, it is determined that the polarity of the current in the control and protection system is the polarity-reduced; and if the current polarity is different, judging that the polarity of the internal current of the control and protection system is the polarity.
In the embodiment, the current loop is divided into two parts for polarity check, then the polarities of the two parts are comprehensively judged, and the current loop is divided into two parts by taking the secondary terminal row of the switch cabinet where the current transformer is located as a boundary. Specifically, the polarity of the control and protection system is comprehensively evaluated according to the polarity relation of the primary side and the secondary side of the current transformer, the current phase of the secondary side of the current transformer and the current phase of the interior of the control and protection system. Specifically, when the polarities of the primary side and the secondary side of the current transformer are the same as the polarity of the current in the control and protection system, the control and protection system is judged to be the polarity-reducing one; and when the polarities of the primary side and the secondary side of the current transformer are different from the polarities of the current in the control and protection system, judging that the control and protection system is polarized.
Alternatively, the current generator may employ a relay protector, an up-converter, or a circuit of the same function.
In an alternative embodiment, the polarity detection apparatus further includes: and the ammeter is connected with the secondary side of the current transformer and is used for changing the current of the secondary side of the current transformer when the direct current power supply is disconnected with the current transformer.
In an alternative embodiment, as shown in fig. 2, the polarity detection apparatus further includes: and the current waveform recorder is connected with the current generator and is used for recording the current of the secondary side of the current transformer.
Specifically, the current waveform recorder is actually a phase testing device, and the phase testing device can also use an oscilloscope or other devices with testing phases.
In an alternative embodiment, as shown in fig. 2, the polarity detection apparatus further includes: the transient wave recording device of the control and protection system is connected with the secondary side of the sampling transformer and is used for recording the internal current of the control and protection system.
In this embodiment, a polarity detection method is provided, and the polarity detection apparatus based on any of the optional implementation manners of the foregoing embodiments, as shown in fig. 3 and fig. 4, includes:
step S11: and disconnecting the positive electrode of the direct current and the primary side of the current transformer for preset times.
Step S12: and judging the polarity of the primary side and the secondary side of the current transformer according to the forward and reverse bias conditions of the ammeter.
Specifically, when the positive electrode of the direct current power supply is not disconnected with the primary side of the current transformer, and when the positive electrode of the direct current power supply is disconnected with the primary side of the current transformer, the deflection direction of the ammeter is the same, and the primary side and the secondary side of the current transformer are polarized; when the positive electrode of the direct current power supply is not disconnected with the primary side of the current transformer, and when the positive electrode of the direct current power supply is disconnected with the primary side of the current transformer, the deflection directions of the ammeter are different, and the primary side and the secondary side of the current transformer are polarity-reduced.
Illustratively, the positive terminal of the ammeter is connected to the S1 end of fig. 1, the negative terminal of the ammeter is connected to the S2 end of fig. 1, the P1 terminal of the current transformer is connected and disconnected several times from the positive pole of the dc power supply, the current loop is polarity-reduced if the ammeter is forward biased each time, and the current loop is polarity-increased if the ammeter is reverse biased when connected.
Step S13: and controlling the current generator to stop outputting the current, and judging the polarity of the current in the control and protection system according to the current of the secondary side of the current transformer and the current of the secondary side of the sampling transformer when the current is stopped outputting.
Specifically, judging whether the phase of the secondary side current of the current transformer is the same as the phase of the secondary side current of the sampling transformer; when the current polarities are the same, judging that the polarities of the currents in the control and protection system are the polarities of the currents in the control and protection system; and if the current polarity is different, judging that the polarity of the internal current of the control and protection system is the polarity.
Specifically, when the secondary side current of the current transformer and the secondary side current of the sampling transformer are simultaneously zeroed on the positive half shaft or the negative half shaft, the phases of the secondary side current and the sampling transformer are identical.
Step S14: and obtaining the polarity of the control and protection system based on the polarity relation of the primary side and the secondary side of the current transformer and the polarity of the current in the control and protection system.
Specifically, in this embodiment, the current loop is divided into two parts for checking the polarities of the two parts, and then the polarities of the two parts are comprehensively judged, and the two parts of the current loop are divided into two parts by taking the secondary terminal row of the switch cabinet where the current transformer is located as a boundary. Specifically, when the polarities of the primary side and the secondary side of the current transformer are the same as the polarity of the current in the control and protection system, the control and protection system is judged to be the polarity-reducing one; and when the polarities of the primary side and the secondary side of the current transformer are different from the polarities of the current in the control and protection system, judging that the control and protection system is polarized.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a polarity detection device, its characterized in that is applied to accuse and protects the system, accuse protects the system and includes current transformer, sampling transformer, and current transformer's secondary passes through current transformer cupboard secondary terminal row, accuse and protects screen cabinet secondary terminal row, sampling transformer terminal row and sampling transformer's primary connection in proper order, the device includes: a DC power supply and a current generator, wherein,
the direct current power supply is connected with the primary side of the current transformer;
the direct current power supply is used for detecting the primary side and the secondary side of the current transformer;
the current generator is connected with a secondary terminal block of the current transformer cabinet; the current generator is used for applying detection current to the primary side of the sampling transformer so as to detect the polarity of the current in the control and protection system; the current generator is used for generating sinusoidal alternating current in the current loop;
the primary side and secondary side polarities of the current transformer, the secondary side current polarity of the current transformer and the internal current polarity of the control and protection system are used for comprehensively evaluating the polarities of the control and protection system.
2. The polarity detection device of claim 1, further comprising:
and the ammeter is connected with the secondary side of the current transformer and is used for changing the current of the secondary side of the current transformer when the direct current power supply is disconnected with the current transformer.
3. The polarity detection device of claim 1, further comprising:
and the current waveform recorder is connected with the current generator and is used for recording the secondary side current of the current transformer.
4. The polarity detection device of claim 2, further comprising:
and the transient wave recording device of the control and protection system is connected with the secondary side of the sampling transformer and is used for recording the internal current of the control and protection system.
5. A polarity detection method, characterized in that it is based on the polarity detection device according to any one of claims 2-4, the method comprising:
disconnecting the positive electrode of the direct current and the primary side of the current transformer for preset times;
judging the polarities of the primary side and the secondary side of the current transformer according to the forward and reverse bias conditions of the ammeter;
the current generator is controlled to stop outputting current, and the polarity of the current in the control and protection system is judged according to the current of the secondary side of the current transformer and the current of the secondary side of the sampling transformer at the moment of stopping outputting the current;
and obtaining the polarity of the control and protection system based on the polarities of the primary side and the secondary side of the current transformer and the polarity of the current in the control and protection system.
6. The method for detecting the polarity of the current transformer according to claim 5, wherein the step of determining the polarities of the primary side and the secondary side of the current transformer according to the forward and reverse bias conditions of the ammeter comprises the steps of:
when the positive electrode of the direct current power supply is not disconnected with the primary side of the current transformer, and when the positive electrode of the direct current power supply is disconnected with the primary side of the current transformer, the deflection direction of the ammeter is the same, and the primary side and the secondary side of the current transformer are polarized;
when the positive electrode of the direct current power supply is not disconnected with the primary side of the current transformer, and when the positive electrode of the direct current power supply is disconnected with the primary side of the current transformer, the deflection directions of the ammeter are different, and the primary side and the secondary side of the current transformer are polarity-reducing.
7. The method of claim 5, wherein the determining the polarity of the current in the control and protection system comprises:
judging whether the phase of the secondary side current of the current transformer is the same as the phase of the secondary side current of the sampling transformer;
when the current polarities are the same, judging that the polarities of the currents in the control and protection system are the polarities of the currents in the control and protection system; and if the current polarity is different, judging that the polarity of the internal current of the control and protection system is the polarity.
8. The polarity detection method of claim 7, wherein the determining whether the phase of the current transformer secondary current is the same as the phase of the sampling transformer secondary current comprises:
when the secondary side current of the current transformer and the secondary side current of the sampling transformer are simultaneously zeroed on a positive half shaft or a negative half shaft, the phases of the secondary side current and the sampling transformer are identical.
9. The method of claim 5, wherein the step of obtaining the polarity of the control and maintenance system comprises:
when the polarities of the primary side and the secondary side of the current transformer are the same as the polarity of the current in the control and protection system, judging that the control and protection system is in the polarity reduction state;
and when the polarities of the primary side and the secondary side of the current transformer are different from the polarities of the currents in the control and protection system, judging that the control and protection system is polarized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311108226.9A CN116840748B (en) | 2023-08-30 | 2023-08-30 | Polarity detection device and method |
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| CN202311108226.9A CN116840748B (en) | 2023-08-30 | 2023-08-30 | Polarity detection device and method |
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| CN116840748B true CN116840748B (en) | 2023-11-14 |
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