CN112363090A - Metering secondary circuit wiring test method - Google Patents
Metering secondary circuit wiring test method Download PDFInfo
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- CN112363090A CN112363090A CN202011033461.0A CN202011033461A CN112363090A CN 112363090 A CN112363090 A CN 112363090A CN 202011033461 A CN202011033461 A CN 202011033461A CN 112363090 A CN112363090 A CN 112363090A
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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
- G01R31/55—Testing for incorrect line connections
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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
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to the technical field of wiring test methods, in particular to a metering secondary circuit wiring test method. The method for testing the wiring of the metering secondary circuit comprises two conditions of high supply and high metering and high supply and low metering. The invention designs a metering secondary circuit wiring tester, which induces secondary current and secondary voltage on the secondary side of a mutual inductor by adding a signal source (less than the maximum safe voltage of a human body) on the primary side of the mutual inductor, and displays whether wiring is correct and the reason of error on the instrument through metering. The instrument can check whether the phase sequence of the wiring of the high-voltage power supply and low-voltage power supply device is correct or not, whether the polarity is reversed or not, whether the polarity is short-circuited or not, whether the polarity is open or not, whether the voltage transformer is connected with the current transformer in a wrong mode or not in an uncharged state, and whether the transformation ratio of the current transformer and the voltage transformer is determined or not can be determined, so that the measurement is quick and accurate.
Description
Technical Field
The invention relates to the technical field of wiring test methods, in particular to a metering secondary circuit wiring test method.
Background
With the development of national economy, the supply and consumption of electricity are continuously increased, and the electric power marketization transaction puts higher requirements on the real-time performance and the accuracy of electric energy data, and the installation accuracy and the operation reliability of the electric energy metering device are more important. Generally, before a user is on line and transmits power, the metering secondary circuit check and acceptance work is to determine whether the secondary circuit of the metering device is connected correctly or not, and can only be determined by judging the phase colors of the A phase, the B phase, the C phase and the N phase (zero line) by naked eyes. According to the national standard, yellow is used for phase A, green is used for phase B, red is used for phase C, and black is used for phase N (zero line). Taking a high-supply-height-meter three-phase four-wire A-phase as an example, as shown in FIG. 1, firstly, an A-phase yellow current incoming line, secondly, an A-phase yellow voltage line, and thirdly, an A-phase yellow current outgoing line. The A phase of the metering secondary loop is provided with a voltage loop and a current loop, and the voltage loop II uses a cross section of 2.5mm2Yellow insulated copper wire and current loop (using cross section of 4 mm)2The difference between the yellow insulated copper wire, the voltage wire and the current wire is very small, the current loop requires the current direction to be correct, and once the current loop is reversely connected (for example, the third phase is reversely connected into the third phase), reverse metering can be caused. If the voltage loop is misconnected to the current loop (such as a wrong connection of a first circuit and a second circuit), the Current Transformer (CT) may be opened, and personal and equipment accidents such as personal safety endangering, high-temperature explosion, inaccurate metering and the like are caused. If the voltage transformer (PT) is misconnected to cause short circuit, personal safety, high-temperature explosion, metering misalignment and other personal and equipment accidents are endangered by high voltage. If A, B, C misconnection is wrong due to human error, more serious consequences may be caused. Therefore, it is extremely important to ensure the correctness of the metering secondary circuit wiring. However, under the current conditions, the wiring condition is judged only by naked eyes in metering and acceptance check, no proper equipment is provided for detecting the wiring correctness, and the fact that the wiring is accepted completely is difficult to ensureIs completely accurate. If the metering secondary circuit has wrong wiring, the accident event endangering the personal safety and the equipment safety can occur after a user is electrified and powered.
Disclosure of Invention
The invention aims to solve the technical problems at least to a certain extent and provides a metering secondary circuit wiring test method, which can directly display whether wiring is correct or not by adding a signal source (the signal source is required to be lower than the safe maximum voltage of a human body) on a primary circuit, and display the reason of the error if the wiring is wrong, thereby avoiding various human errors.
The technical scheme of the invention is as follows: the method comprises the steps of measuring the wiring of a secondary circuit, wherein the method comprises two conditions of high supply and high measurement and high supply and low measurement;
the high-supply-and-high-count meter comprises: connecting a voltage current source terminal to a primary terminal of a current transformer in an uncharged state; a, B, C terminals of the instrument are respectively and correspondingly connected to a A, B, C phase current transformer for one time; the A, B, C phase clamp meter of the host machine is clamped on the secondary side of the A, B, C phase current transformer, and a voltage wire holder is inserted on a wire connecting terminal of the electric meter; after the wire is connected, the voltage current source outputs a primary current and a primary voltage value, and a secondary current and a secondary voltage are induced on the secondary side; according to the characteristics of the transformer, whether the wiring of the transformer is correct is judged by detecting the amplitude and the phase of the primary current and the secondary current, and the voltage and the transformation ratio of the current transformer are measured by comparing the amplitudes of the current and the voltage of the extension of the host machine;
the high supply low meter comprises: connecting a voltage current source terminal to a primary terminal of a current transformer in an uncharged state; a, B, C terminals of the instrument are respectively and correspondingly connected to a A, B, C phase current transformer for one time; the A, B, C phase clamp meter of the host machine is clamped on the secondary side of the A, B, C phase current transformer, and a voltage wire holder is inserted on a wire connecting terminal of the electric meter; after the wire is connected, the voltage current source outputs a primary current and a primary voltage value, and a secondary current and a secondary voltage are induced on the secondary side; and then according to the characteristics of the transformer, whether the wiring of the transformer is correct is judged by detecting the amplitude and the phase of the primary current and the secondary current, and the transformation ratio of the current transformer is measured by comparing the current amplitudes of the main machine and the extension machine.
Specifically, in the case of high supply and high count, when the phase sequence is correct, the voltage and current source raises the phase current and voltage of phase a, and the tester detects the phase current and voltage values of three phases; if the phase A detects corresponding current and voltage values, the wiring of the phase A is normal, and the instrument displays the detection result; similarly, the wiring of the phase B and the phase C can be judged to be normal;
under the condition of phase sequence error, the voltage current source raises the phase current and voltage of A, and the tester detects the values of three-phase current and voltage; if the corresponding current and voltage values are detected by the phase B or the phase C, the phase A is in a staggered connection with the phase B or the phase C, and the instrument displays the detection result; in the same way, the condition that the phase B and the phase C are in wrong connection can be judged.
In the high supply and high count condition, the single-phase polarity is normal: the voltage current source raises phase current and voltage of A phase, and the tester detects phase current and voltage of three phases; if the phase of the A-phase current and the voltage are 0 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are normal, and the instrument displays a detection result; similarly, the phase B and phase C currents or the voltage polarity can be judged to be normal;
under the condition that the single-phase polarities are opposite, the voltage current source raises the phase current A and the voltage, and the tester detects the phase current and the voltage of the three phases; if the phase of the A-phase current and the voltage are 180 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are opposite, and the instrument displays a detection result; similarly, the phase B and phase C currents or voltages may be judged to be of opposite polarity.
In the high supply and high count condition, the secondary circuit is broken, the voltage current source raises the phase A current and the voltage, and the tester detects the three-phase current and the voltage; if the phase A current can not be raised, the voltage can be raised, and the host can not detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are open-circuited, and the instrument displays the detection result; similarly, the currents of the phase B and the phase C or the open circuit of the secondary circuit of the voltage transformer can be judged;
the secondary circuit is short-circuited, the voltage current source raises the phase A current and the voltage, and the tester detects the three-phase current and the three-phase voltage; if the phase A current can be raised, the voltage cannot be raised, and the host cannot detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are short-circuited, and the instrument displays the detection result; similarly, the phase B and phase C currents or the secondary circuit of the voltage transformer can be judged to be short-circuited.
In the high-supply and high-count condition, the ratio of a current transformer is detected, a voltage current source raises the phase current and voltage of A, and a tester detects the phase current and voltage of three phases; if the phase current and the voltage of the A phase can be raised, the host detects the current and the voltage, the ratio of the phase current of the A phase detected by the host to the current raised by the extension set is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio; similarly, the mutual inductor ratio of the phase B and the phase C can be detected;
detecting the ratio of a voltage transformer, boosting the phase current and voltage of a voltage current source, and detecting the three-phase current and voltage by a tester; if the phase current and the phase voltage of the A phase can be raised, the host machine detects the current and the voltage, the ratio of the phase voltage of the A phase detected by the host machine to the raised voltage of the extension machine is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio; similarly, the ratio of the phase B and phase C voltage transformers can be detected.
In the condition of high power supply and low power consumption, under the condition of correct phase sequence, the voltage current source raises the phase current and voltage of A, and the tester detects the values of three-phase current and voltage; if the phase A detects corresponding current and voltage values, the wiring of the phase A is normal, and the instrument displays the detection result; in the same way, the wiring of the phase B and the phase C can be judged to be normal.
In the high-supply low-count condition, the phase sequence error condition is that the voltage current source raises the phase current and voltage of A phase, and the tester detects the values of the three-phase current and voltage; if the corresponding current and voltage values are detected by the phase B or the phase C, the phase A is in a staggered connection with the phase B or the phase C, and the instrument displays the detection result; in the same way, the condition that the phase B and the phase C are in wrong connection can be judged.
In the high-supply low-count condition, under the condition that the single-phase polarity is normal, the voltage current source raises the phase current and the voltage of A phase, and the tester detects the phase current and the voltage of three phases; if the phase of the A-phase current and the voltage are 0 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are normal, and the instrument displays a detection result; similarly, the phase B and phase C currents or the voltage polarities can be judged to be normal.
In the high-supply low-count condition, the single-phase polarity is opposite, the voltage current source raises the phase current and the voltage of the phase A, and the tester detects the phase current and the voltage of the three phases; if the phase of the A-phase current and the voltage are 180 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are opposite, and the instrument displays a detection result; similarly, the phase B and phase C currents or voltages may be judged to be of opposite polarity.
In the high-supply low-count condition, the secondary circuit is broken, the voltage current source raises the phase A current and the voltage, and the tester detects the three-phase current and the voltage; if the phase A current can not be raised, the voltage can be raised, and the host can not detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are open-circuited, and the instrument displays the detection result; similarly, the currents of the phase B and the phase C or the open circuit of the secondary circuit of the voltage transformer can be judged;
the secondary circuit is short-circuited, the voltage current source raises the phase A current and the voltage, and the tester detects the three-phase current and the three-phase voltage; if the phase A current can be raised, the voltage cannot be raised, and the host cannot detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are short-circuited, and the instrument displays the detection result; similarly, the phase B and phase C currents or the short circuit of the secondary circuit of the voltage transformer can be judged;
detecting the ratio of a current transformer, boosting the A-phase current and voltage by a voltage current source, and detecting the three-phase current and voltage by a tester; if the phase current and the voltage of the A phase can be raised, the host detects the current and the voltage, the ratio of the phase current of the A phase detected by the host to the current raised by the extension set is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio; similarly, the mutual inductor ratio of the B-phase current and the C-phase current can be detected.
Compared with the prior art, the beneficial effects are: the invention designs a metering secondary circuit wiring tester, which induces secondary current and secondary voltage on the secondary side of a mutual inductor by adding a signal source (less than the maximum safe voltage of a human body) on the primary side of the mutual inductor, and displays whether wiring is correct and the reason of error on the instrument through metering. The instrument can check whether the phase sequence of the wiring of the high-voltage power supply and low-voltage power supply device is correct or not, whether the polarity is reversed or not, whether the polarity is short-circuited or not, whether the polarity is open or not, whether the voltage transformer is connected with the current transformer in a wrong mode or not in an uncharged state, and whether the transformation ratio of the current transformer and the voltage transformer is determined or not can be determined, so that the measurement is quick and accurate.
Drawings
Fig. 1 is a wiring diagram of a conventional electric energy meter.
Fig. 2 is a schematic diagram of a high-supply high-count three-phase four-wire system of the present invention.
Fig. 3 is a schematic diagram of a high supply and high count three-phase three-wire of the present invention.
FIG. 4 is a schematic diagram of the high power and low power meter of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
As shown in fig. 2-4, the high supply meter and the high supply meter are divided according to the metering mode:
high supply and high count: in the uncharged state, the voltage current source terminal is connected to the primary terminal of the current transformer. As shown in FIG. 1, A, B, C terminals of the instrument are respectively connected to A, B, C phase current transformers once. The A, B, C phase clamp meter of the main machine is clamped on the secondary side (a wire close to the electric meter) of the A, B, C phase current transformer, and a voltage wire holder is inserted on a wire connecting terminal of the electric meter. After the line is connected, the voltage current source (extension) outputs a primary current and a primary voltage value, and a secondary current and a secondary voltage are induced on the secondary side. According to the transformer characteristics (when primary or secondary wiring is in positive connection or reverse connection, the phase of a secondary loop current is different), whether the transformer wiring is correct or not is judged by detecting the amplitude and the phase of a secondary current voltage, and the voltage and the current transformer transformation ratio are measured by comparing the amplitude of the current voltage of the main machine extension set.
1. And (4) the phase sequence is correct. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage values. If the phase A detects corresponding current and voltage values, the wiring of the phase A is normal, and the instrument displays the detection result. In the same way, the wiring of the phase B and the phase C can be judged to be normal.
2. And under the condition of phase sequence error, the voltage current source (extension) raises the phase current and voltage of A, and the tester (host) detects the current and voltage values of three phases. If the corresponding current and voltage values are detected by the phase B or the phase C, the phase A is in a staggered connection with the phase B or the phase C, and the instrument displays the detection result. In the same way, the condition that the phase B and the phase C are in wrong connection can be judged.
3. Single phase polarity normal condition. The voltage current source (extension) raises phase current and voltage of A phase, and the tester (host) detects phase current and voltage of three phases. If the phase of the A-phase current and the voltage are 0 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are normal, and the instrument displays the detection result. Similarly, the phase B and phase C currents or the voltage polarities can be judged to be normal.
4. Single phase opposite polarity. The voltage current source (extension) raises phase current and voltage of A phase, and the tester (host) detects phase current and voltage of three phases. If the phase of the A-phase current and the voltage is 180 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are opposite, and the instrument displays the detection result. Similarly, the phase B and phase C currents or voltages may be judged to be of opposite polarity.
5. The secondary circuit is open. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage. If the phase A current can not be raised, the voltage can be raised, and the host can not detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are broken, and the instrument displays the detection result. Similarly, the currents of the phase B and the phase C or the secondary circuit of the voltage transformer can be judged to be broken.
6. The secondary circuit is short-circuited. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage. If the A-phase current can be raised, the voltage cannot be raised, and the host cannot detect the current and the voltage, the A-phase current and the secondary circuit of the voltage transformer are short-circuited, and the instrument displays the detection result. Similarly, the phase B and phase C currents or the secondary circuit of the voltage transformer can be judged to be short-circuited.
7. And detecting the ratio of the current transformer. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage. If the phase current and the voltage of the A phase can be raised, the host detects the current and the voltage, the ratio of the phase current of the A phase detected by the host to the current raised by the extension set is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio. Similarly, the mutual inductor ratio of the B-phase current and the C-phase current can be detected.
8. And detecting the ratio of the voltage transformer. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage. If the phase current and the phase voltage can be raised, the host machine detects the current and the voltage, the ratio of the phase voltage A detected by the host machine to the raised voltage of the extension machine is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio. Similarly, the ratio of the phase B and phase C voltage transformers can be detected.
High-supply low-supply meter: the high-power supply low-voltage meter and the high-power supply high-voltage meter have basically no difference in test mode, protection processing can be conducted, and danger is prevented when the primary voltage of the transformer is too high after the voltage current source is boosted.
In the uncharged state, the voltage current source terminal is connected to the primary terminal of the current transformer. As shown in FIG. 2, A, B, C terminals of the instrument are respectively connected to A, B, C phase current transformers once. The A, B, C phase clamp meter of the main machine is clamped on the secondary side (a wire close to the electric meter) of the A, B, C phase current transformer, and a voltage wire holder is inserted on a wire connecting terminal of the electric meter. After the line is connected, the voltage current source (extension) outputs a primary current and a primary voltage value, and a secondary current and a secondary voltage are induced on the secondary side. And then according to the transformer characteristics (when primary or secondary wiring is in positive connection or reverse connection, the current phase of a secondary loop is different), whether the wiring of the transformer is correct or not is judged by detecting the amplitude and the phase of the voltage of the secondary current, and the transformation ratio of the current transformer is measured by comparing the current amplitudes of the extension of the host machine.
1. And (4) the phase sequence is correct. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage values. If the phase A detects corresponding current and voltage values, the wiring of the phase A is normal, and the instrument displays the detection result. In the same way, the wiring of the phase B and the phase C can be judged to be normal.
2. And under the condition of phase sequence error, the voltage current source (extension) raises the phase current and voltage of A, and the tester (host) detects the current and voltage values of three phases. If the corresponding current and voltage values are detected by the phase B or the phase C, the phase A is in a staggered connection with the phase B or the phase C, and the instrument displays the detection result. In the same way, the condition that the phase B and the phase C are in wrong connection can be judged.
3. Single phase polarity normal condition. The voltage current source (extension) raises phase current and voltage of A phase, and the tester (host) detects phase current and voltage of three phases. If the phase of the A-phase current and the voltage are 0 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are normal, and the instrument displays the detection result. Similarly, the phase B and phase C currents or the voltage polarities can be judged to be normal.
4. Single phase opposite polarity. The voltage current source (extension) raises phase current and voltage of A phase, and the tester (host) detects phase current and voltage of three phases. If the phase of the A-phase current and the voltage is 180 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are opposite, and the instrument displays the detection result. Similarly, the phase B and phase C currents or voltages may be judged to be of opposite polarity.
5. The secondary circuit is open. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage. If the phase A current can not be raised, the voltage can be raised, and the host can not detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are broken, and the instrument displays the detection result. Similarly, the currents of the phase B and the phase C or the secondary circuit of the voltage transformer can be judged to be broken.
6. The secondary circuit is short-circuited. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage. If the A-phase current can be raised, the voltage cannot be raised, and the host cannot detect the current and the voltage, the A-phase current and the secondary circuit of the voltage transformer are short-circuited, and the instrument displays the detection result. Similarly, the phase B and phase C currents or the secondary circuit of the voltage transformer can be judged to be short-circuited.
And detecting the ratio of the current transformer. The voltage current source (extension) raises the A-phase current and voltage, and the tester (host) detects the three-phase current and voltage. If the phase current and the voltage of the A phase can be raised, the host detects the current and the voltage, the ratio of the phase current of the A phase detected by the host to the current raised by the extension set is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio. Similarly, the mutual inductor ratio of the B-phase current and the C-phase current can be detected.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The wiring test method of the metering secondary circuit is characterized by comprising two conditions of high supply and high metering and high supply and low metering;
the high-supply-and-high-count meter comprises: connecting a voltage current source terminal to a primary terminal of a current transformer in an uncharged state; a, B, C terminals of the instrument are respectively and correspondingly connected to a A, B, C phase current transformer for one time; the A, B, C phase clamp meter of the host machine is clamped on the secondary side of the A, B, C phase current transformer, and a voltage wire holder is inserted on a wire connecting terminal of the electric meter; after the wire is connected, the voltage current source outputs a primary current and a primary voltage value, and a secondary current and a secondary voltage are induced on the secondary side; according to the characteristics of the transformer, whether the wiring of the transformer is correct is judged by detecting the amplitude and the phase of the primary current and the secondary current, and the voltage and the transformation ratio of the current transformer are measured by comparing the amplitudes of the current and the voltage of the extension of the host machine;
the high supply low meter comprises: connecting a voltage current source terminal to a primary terminal of a current transformer in an uncharged state; a, B, C terminals of the instrument are respectively and correspondingly connected to a A, B, C phase current transformer for one time; the A, B, C phase clamp meter of the host machine is clamped on the secondary side of the A, B, C phase current transformer, and a voltage wire holder is inserted on a wire connecting terminal of the electric meter; after the wire is connected, the voltage current source outputs a primary current and a primary voltage value, and a secondary current and a secondary voltage are induced on the secondary side; and then according to the characteristics of the transformer, whether the wiring of the transformer is correct is judged by detecting the amplitude and the phase of the primary current and the secondary current, and the transformation ratio of the current transformer is measured by comparing the current amplitudes of the main machine and the extension machine.
2. The metered secondary circuit wiring test method of claim 1, wherein: in the high supply and high metering condition, under the condition that the phase sequence is correct, the voltage and current source raises the phase current and voltage of A, and the tester detects the phase current and voltage values of three phases; if the phase A detects corresponding current and voltage values, the wiring of the phase A is normal, and the instrument displays the detection result; similarly, the wiring of the phase B and the phase C can be judged to be normal;
under the condition of phase sequence error, the voltage current source raises the phase current and voltage of A, and the tester detects the values of three-phase current and voltage; if the corresponding current and voltage values are detected by the phase B or the phase C, the phase A is in a staggered connection with the phase B or the phase C, and the instrument displays the detection result; in the same way, the condition that the phase B and the phase C are in wrong connection can be judged.
3. The metered secondary circuit wiring test method of claim 2, wherein: in the high supply and high count condition, the single-phase polarity is normal: the voltage current source raises phase current and voltage of A phase, and the tester detects phase current and voltage of three phases; if the phase of the A-phase current and the voltage are 0 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are normal, and the instrument displays a detection result; similarly, the phase B and phase C currents or the voltage polarity can be judged to be normal;
under the condition that the single-phase polarities are opposite, the voltage current source raises the phase current A and the voltage, and the tester detects the phase current and the voltage of the three phases; if the phase of the A-phase current and the voltage are 180 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are opposite, and the instrument displays a detection result; similarly, the phase B and phase C currents or voltages may be judged to be of opposite polarity.
4. The metered secondary circuit wiring test method of claim 3, wherein: in the high supply and high count condition, the secondary circuit is broken, the voltage current source raises the phase A current and the voltage, and the tester detects the three-phase current and the voltage; if the phase A current can not be raised, the voltage can be raised, and the host can not detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are open-circuited, and the instrument displays the detection result; similarly, the currents of the phase B and the phase C or the open circuit of the secondary circuit of the voltage transformer can be judged;
the secondary circuit is short-circuited, the voltage current source raises the phase A current and the voltage, and the tester detects the three-phase current and the three-phase voltage; if the phase A current can be raised, the voltage cannot be raised, and the host cannot detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are short-circuited, and the instrument displays the detection result; similarly, the phase B and phase C currents or the secondary circuit of the voltage transformer can be judged to be short-circuited.
5. The metered secondary circuit wiring test method of claim 4, wherein: in the high-supply and high-count condition, the ratio of a current transformer is detected, a voltage current source raises the phase current and voltage of A, and a tester detects the phase current and voltage of three phases; if the phase current and the voltage of the A phase can be raised, the host detects the current and the voltage, the ratio of the phase current of the A phase detected by the host to the current raised by the extension set is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio; similarly, the mutual inductor ratio of the phase B and the phase C can be detected;
detecting the ratio of a voltage transformer, boosting the phase current and voltage of a voltage current source, and detecting the three-phase current and voltage by a tester; if the phase current and the phase voltage of the A phase can be raised, the host machine detects the current and the voltage, the ratio of the phase voltage of the A phase detected by the host machine to the raised voltage of the extension machine is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio; similarly, the ratio of the phase B and phase C voltage transformers can be detected.
6. The metered secondary circuit wiring test method of claim 1, wherein: in the condition of high power supply and low power consumption, under the condition of correct phase sequence, the voltage current source raises the phase current and voltage of A, and the tester detects the values of three-phase current and voltage; if the phase A detects corresponding current and voltage values, the wiring of the phase A is normal, and the instrument displays the detection result; in the same way, the wiring of the phase B and the phase C can be judged to be normal.
7. The metered secondary circuit wiring test method of claim 6, wherein: in the high-supply low-count condition, the phase sequence error condition is that the voltage current source raises the phase current and voltage of A phase, and the tester detects the values of the three-phase current and voltage; if the corresponding current and voltage values are detected by the phase B or the phase C, the phase A is in a staggered connection with the phase B or the phase C, and the instrument displays the detection result; in the same way, the condition that the phase B and the phase C are in wrong connection can be judged.
8. The metered secondary circuit wiring test method of claim 7, wherein: in the high-supply low-count condition, under the condition that the single-phase polarity is normal, the voltage current source raises the phase current and the voltage of A phase, and the tester detects the phase current and the voltage of three phases; if the phase of the A-phase current and the voltage are 0 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are normal, and the instrument displays a detection result; similarly, the phase B and phase C currents or the voltage polarities can be judged to be normal.
9. The metered secondary circuit wiring test method of claim 8, wherein: in the high-supply low-count condition, the single-phase polarity is opposite, the voltage current source raises the phase current and the voltage of the phase A, and the tester detects the phase current and the voltage of the three phases; if the phase of the A-phase current and the voltage are 180 degrees relative to the phase of the extension current and the phase of the voltage respectively, the polarity of the phase of the A-phase current and the polarity of the voltage are opposite, and the instrument displays a detection result; similarly, the phase B and phase C currents or voltages may be judged to be of opposite polarity.
10. The metered secondary circuit wiring test method of claim 8, wherein: in the high-supply low-count condition, the secondary circuit is broken, the voltage current source raises the phase A current and the voltage, and the tester detects the three-phase current and the voltage; if the phase A current can not be raised, the voltage can be raised, and the host can not detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are open-circuited, and the instrument displays the detection result; similarly, the currents of the phase B and the phase C or the open circuit of the secondary circuit of the voltage transformer can be judged;
the secondary circuit is short-circuited, the voltage current source raises the phase A current and the voltage, and the tester detects the three-phase current and the three-phase voltage; if the phase A current can be raised, the voltage cannot be raised, and the host cannot detect the current and the voltage, the phase A current and the secondary circuit of the voltage transformer are short-circuited, and the instrument displays the detection result; similarly, the phase B and phase C currents or the short circuit of the secondary circuit of the voltage transformer can be judged;
detecting the ratio of a current transformer, boosting the A-phase current and voltage by a voltage current source, and detecting the three-phase current and voltage by a tester; if the phase current and the voltage of the A phase can be raised, the host detects the current and the voltage, the ratio of the phase current of the A phase detected by the host to the current raised by the extension set is the ratio of the mutual inductor, and the instrument displays the detection result according to the set ratio; similarly, the mutual inductor ratio of the B-phase current and the C-phase current can be detected.
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| CN113848526A (en) * | 2021-09-18 | 2021-12-28 | 深圳供电局有限公司 | Voltage transformer loop detection method, system, equipment and storage medium |
| CN114113821A (en) * | 2021-09-30 | 2022-03-01 | 华能太仓发电有限责任公司 | Incoming line current transformer wiring identification method for bus differential protection device |
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| CN114113821A (en) * | 2021-09-30 | 2022-03-01 | 华能太仓发电有限责任公司 | Incoming line current transformer wiring identification method for bus differential protection device |
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