CN109283421B - Low-voltage power-on detection test method and device for railway traction substation - Google Patents
Low-voltage power-on detection test method and device for railway traction substation Download PDFInfo
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- CN109283421B CN109283421B CN201811202658.5A CN201811202658A CN109283421B CN 109283421 B CN109283421 B CN 109283421B CN 201811202658 A CN201811202658 A CN 201811202658A CN 109283421 B CN109283421 B CN 109283421B
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- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000005259 measurement Methods 0.000 claims abstract description 26
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- 239000013598 vector Substances 0.000 claims description 45
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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
- G01R31/62—Testing of transformers
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Abstract
The invention relates to the field of power transmission, and discloses a low-voltage electrifying detection test method and device for a railway traction substation, wherein the method and device are used for detecting whether the wiring of a differential protection circuit is correct or not by measuring the differential protection circuit of a main transformer according to the type of the transformer; detecting whether the feeder line protection loop is correctly connected according to the phase value and the current value of the three-phase current; and judging whether the wiring of the differential protection circuit and the feeder protection circuit is correct or not according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit. The invention is suitable for technical specification detection tests of all power supply modes of the railway traction substation, the railway power distribution substation and a single transformer, and can accurately verify whether the current loop and the voltage loop of the whole railway traction substation are correctly wired and whether the current loop and the voltage loop have shunt conditions or not. The invention realizes a low-voltage power-on detection test of the railway traction substation, which is simple and easy to operate, and has simple flow and easy popularization.
Description
Technical Field
The invention relates to the field of power transmission, in particular to a low-voltage power-on detection test method and device for a railway traction substation.
Background
The traction substation is a place where electric energy sent from a power plant through an electric power transmission line is converted into a voltage suitable for rolling stock and distributed to a contact net or a contact rail (third rail). In the prior art, the power-on condition of the traction substation is required to be detected in time, but a simple low-voltage power-on detection test method for the railway traction substation is not available.
Disclosure of Invention
The invention provides a low-voltage power-on detection test method and device for a railway traction substation, which solve the technical problem that no simple low-voltage power-on detection test method for the railway traction substation exists in the prior art.
The invention aims at realizing the following technical scheme:
a low-voltage power-on detection test method for a railway traction substation comprises the following steps:
according to the type of the transformer, measuring a differential protection loop of the main transformer to detect whether the wiring of the differential protection loop is correct, wherein the type of the transformer comprises a double-coil transformer, a balance traction transformer and a single-phase traction transformer;
detecting whether the feeder line protection loop is correctly connected according to the phase value and the current value of the three-phase current;
and judging whether the wiring of the differential protection circuit and the feeder protection circuit is correct or not according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit.
A low voltage power-on detection test device for a railway traction substation, comprising:
the first test module is used for measuring a differential protection loop of the main transformer according to the type of the transformer so as to detect whether the wiring of the differential protection loop is correct, wherein the type of the transformer comprises a double-coil transformer, a balance traction transformer and a single-phase traction transformer;
the second test module is used for detecting whether the wiring of the feeder protection loop is correct or not according to the phase value and the current value of the three-phase current;
the power-on judging module is used for judging whether the wiring of the differential protection circuit and the feeder protection circuit is correct or not according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit.
The invention provides a low-voltage electrifying detection test method and a device for a railway traction substation, which are used for detecting whether the wiring of a differential protection loop is correct or not by measuring a differential protection loop of a main transformer according to the type of the transformer; detecting whether the feeder line protection loop is correctly connected according to the phase value and the current value of the three-phase current; and judging whether the wiring of the differential protection circuit and the feeder protection circuit is correct or not according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit. The invention realizes a low-voltage power-on detection test of the railway traction substation, which is simple and easy to operate, and has simple flow and easy popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a low-voltage power-on detection test method of a railway traction substation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a differential loop test wiring structure according to an embodiment of the present invention
FIG. 3 is a schematic diagram of a Watt-Table wiring in accordance with an embodiment of the present invention
FIG. 4 is a schematic diagram of a current vector diagram of an embodiment of the present invention;
FIG. 5 is a hexagonal schematic diagram of a differential protection vector according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a feeder loop test wiring of an embodiment of the present invention;
FIG. 7 is a schematic diagram of a feeder protection tester wiring according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a low-voltage power-on detection test device for a railway traction substation according to an embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The embodiment of the invention provides a low-voltage power-on detection test method for a railway traction substation, which is shown in fig. 1 and comprises the following steps:
step 101, measuring a differential protection loop of a main transformer according to the type of the transformer so as to detect whether the wiring of the differential protection loop is correct;
wherein the transformer types include a dual-coil transformer, a balanced traction transformer, and a single-phase traction transformer;
102, detecting whether the feeder protection loop is correctly wired according to the phase value and the current value of the three-phase current;
step 103, judging whether the wiring of the differential protection circuit and the feeder protection circuit is correct according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit.
When the transformer type is a dual-coil transformer or a single-phase traction transformer, the step 101 may specifically include two modes, as follows:
1. phase meter measurement as shown in FIG. 2
Short-circuit grounding the line of the outlet side of the current transformer at the secondary side of the main transformer; the method comprises the steps that a main transformer inlet-outlet wire side breaker and a manual isolating switch in front of the inlet-wire side breaker are located at a closing position; applying alternating current three-phase voltage to the primary side current transformer inlet side of the main transformer through a voltage regulator to enable the alternating current three-phase voltage to be input in positive phase sequence, and measuring current of each phase in sequence; then, respectively connecting phase meters and milliampere meters from the inlet and outlet ends of the differential protection current test terminals of the main transformer protection disc, opening the current test terminal connecting piece, observing the current meters and the phase meters, and reading corresponding current values, phase angles relative to reference voltages and differential current values; closing a current test terminal; drawing a high-voltage side line current vector diagram and a low-voltage side line current vector diagram of the differential protection of the transformer according to the tested data so as to detect whether the wiring of a differential protection loop is correct or not;
2. low power factor watt meter method as shown in figure 3
Checking the polarity of the Watt meter, confirming the inlet end of current or voltage, and leading the three-phase voltage consistent with the phase sequence of the voltage applied to the primary side of the main transformer to the side of the Watt meter; sequentially and respectively connecting the detected primary and secondary three-phase currents into a watt meter current coil and a watt meter, sequentially reading and recording the watt meter readings; when the wattmeter indicates a negative value, the voltage wiring is exchanged, and the projection of the measured current vector on the voltage vector is carried out; when the reading of the watt meter is positive, the projection of the watt meter and the voltage vector are in the same direction; otherwise, the voltage vector is in the same direction as the negative direction; and making a current vector hexagonal chart of the differential circuit according to the measured data so as to detect whether the wiring of the differential protection circuit is correct.
When the transformer type is a balanced traction transformer or a single-phase traction transformer, the step 101 may specifically include:
the secondary side current is connected into the differential relay after passing through the current phase-shifting converter, the testing instrument is connected in series at the terminal of the differential relay, and a phasor diagram is drawn according to the measured phase-shifted data.
Step 102 may specifically include:
the main transformer secondary side circuit breaker and the feeder circuit breaker are positioned separately, and the 27.5kV bus contact isolating switch and the voltage transformer isolating switch are in a closed state; an adjustable resistor or an electric furnace is connected in series between the outlet side of the feeder current transformer of the corresponding phase and the grounding electrode, and alternating current 220V voltage is applied between an A-phase bus of 27.5kV and the grounding electrode; observing and recording the current value of the loop; the voltage and current terminals of the testing instrument (phase meter, milliamp meter) are connected in parallel and in series according to the same name end at the back voltage and current connecting terminals of the feeder protection screen A-phase feeder protection device; reading and recording display values of a phase meter and a milliamp meter; and judging whether the wiring of the alternating voltage and current loop of the feeder line protection device is correct or not according to the measured data.
In order to determine whether the wiring is correct according to the measurement result, step 103 may specifically include:
when the type of the differential relay is that when the current ratio differential protection device is adopted, a current vector diagram is drawn, and when the phase angles of three-phase currents are 120 degrees, the phase currents at the positive phase sequence, the high-voltage side and the low-voltage side are about equal in phase, and the phase difference is about 180 degrees, the differential circuit is judged to be correctly connected; or,
when the type of the differential relay is a current ratio phase type differential protection device, the current vectors of two differential arms of the corresponding phase of the transformer are the same; in the drawn vector diagram, the phase angles of three-phase currents are 120 degrees, positive phase sequences are formed, the same-phase currents on the high-voltage side and the low-voltage side are about equal in size and same in phase, and the differential circuit connection is judged to be correct;
the current comparison principle of external current balance is adopted, and the current vectors of two differential arms of the corresponding phase of the transformer are required to be 180 degrees different, and the current phase difference of two arms of the same side is 60 degrees; for a microcomputer type differential protection device, a current ratio phase principle is generally adopted to judge that current vectors of two differential arms of corresponding phases of a transformer are the same, and the current phase difference of two arms on the same side is 60 degrees; and judging whether the wiring of the differential protection loop is correct according to whether the test results of the differential protection of the two main transformers are consistent.
In order to improve the safety and the measurement efficiency, before step 101, various checking links may be further included, as follows:
step 101-1, checking whether primary equipment installation wiring of a traction substation is the same as a designed primary main wiring diagram;
step 10-2, detecting whether no one works on all primary equipment and buses;
step 101-3, whether the three-phase alternating current power supply is stable;
and step 101-4, the incoming line isolating switch of the substation is positioned at the opening position.
The embodiment of the invention provides a low-voltage electrifying detection test method for a railway traction substation, which is used for detecting whether the wiring of a differential protection loop is correct or not by measuring a differential protection loop of a main transformer according to the type of the transformer; detecting whether the feeder line protection loop is correctly connected according to the phase value and the current value of the three-phase current; and judging whether the wiring of the differential protection circuit and the feeder protection circuit is correct or not according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit. The invention realizes a low-voltage power-on detection test of the railway traction substation, which is simple and easy to operate, and has simple flow and easy popularization.
The embodiment of the invention also provides a low-voltage power-on detection test device for the railway traction substation, which is shown in fig. 8 and comprises the following components:
a first test module 810 for performing main transformer differential protection loop measurements based on transformer types including a dual-coil transformer, a balanced traction transformer, and a single-phase traction transformer to detect whether the differential protection loop is properly wired;
a second test module 820 for detecting whether the feeder protection loop is correctly wired according to the phase value and the current value of the three-phase current;
the power-on judging module 830 is configured to judge whether the connection of the differential protection circuit and the feeder protection circuit is correct according to the type of the differential protection device, the measurement result of the differential protection circuit, and the measurement result of the feeder protection circuit.
When the transformer type is a double-coil transformer or a single-phase traction transformer, the first test module is specifically used for short-circuiting and grounding a line on an outgoing line side of a current transformer on a secondary side of the main transformer; the method comprises the steps that a main transformer inlet-outlet wire side breaker and a manual isolating switch in front of the inlet-wire side breaker are located at a closing position; applying alternating current three-phase voltage to the primary side current transformer inlet side of the main transformer through a voltage regulator to enable the alternating current three-phase voltage to be input in positive phase sequence, and measuring current of each phase in sequence; then, respectively connecting phase meters and milliampere meters from the inlet and outlet ends of the differential protection current test terminals of the main transformer protection disc, opening the current test terminal connecting piece, observing the current meters and the phase meters, and reading corresponding current values, phase angles relative to reference voltages and differential current values; closing a current test terminal; drawing a high-voltage side line current vector diagram and a low-voltage side line current vector diagram of the differential protection of the transformer according to the tested data so as to detect whether the wiring of a differential protection loop is correct or not; or,
checking the polarity of the Watt meter, confirming the inlet end of current or voltage, and leading the three-phase voltage consistent with the phase sequence of the voltage applied to the primary side of the main transformer to the side of the Watt meter; sequentially and respectively connecting the detected primary and secondary three-phase currents into a watt meter current coil and a watt meter, sequentially reading and recording the watt meter readings; when the wattmeter indicates a negative value, the voltage wiring is exchanged, and the projection of the measured current vector on the voltage vector is carried out; when the reading of the watt meter is positive, the projection of the watt meter and the voltage vector are in the same direction; otherwise, the voltage vector is in the same direction as the negative direction; and making a current vector hexagonal chart of the differential circuit according to the measured data so as to detect whether the wiring of the differential protection circuit is correct.
When the transformer type is a balance traction transformer or a single-phase traction transformer, the first test module is specifically used for connecting the secondary side current into the differential relay after passing through the current phase-shifting converter, connecting the test instrument in series at the differential relay terminal, and drawing a phasor diagram according to the measured phase-shifted data.
The power-on judging module is particularly used for enabling the secondary side circuit breaker and the feeder circuit breaker of the main transformer to be in a separated position, and enabling the 27.5kV bus contact isolating switch and the voltage transformer isolating switch to be in a closed state; an adjustable resistor or an electric furnace is connected in series between the outlet side of the feeder current transformer of the corresponding phase and the grounding electrode, and alternating current 220V voltage is applied between an A-phase bus of 27.5kV and the grounding electrode; observing and recording the current value of the loop; the voltage and current terminals of the testing instrument (phase meter, milliamp meter) are connected in parallel and in series according to the same name end at the back voltage and current connecting terminals of the feeder protection screen A-phase feeder protection device; reading and recording display values of a phase meter and a milliamp meter; and judging whether the wiring of the alternating voltage and current loop of the feeder line protection device is correct or not according to the measured data.
The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the principles and embodiments of the invention may be implemented in conjunction with the detailed description of the invention that follows, the examples being merely intended to facilitate an understanding of the method of the invention and its core concepts; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (3)
1. The low-voltage power-on detection test method for the railway traction substation is characterized by comprising the following steps of:
according to the type of the transformer, measuring a differential protection loop of the main transformer to detect whether the wiring of the differential protection loop is correct, wherein the type of the transformer comprises a double-coil transformer, a balance traction transformer and a single-phase traction transformer; when the transformer type is a double-coil transformer or a single-phase traction transformer, the step of measuring the differential protection circuit of the main transformer according to the type of the transformer to detect whether the wiring of the differential protection circuit is correct comprises the following steps:
shorting the feeder circuit breaker on the secondary side of the main transformer of the railway traction substation to form a closed loop of the whole traction substation;
the method comprises the steps that a main transformer inlet-outlet wire side breaker and a manual isolating switch in front of the inlet-wire side breaker are located at a closing position;
applying alternating current three-phase voltage to the primary side current transformer inlet side of the main transformer through a voltage regulator to enable the alternating current three-phase voltage to be input in positive phase sequence, and measuring current of each phase in sequence;
then, respectively connecting phase meters and milliampere meters from the inlet and outlet ends of the differential protection current test terminals of the main transformer protection disc, opening the current test terminal connecting piece, observing the current meters and the phase meters, and reading corresponding current values, phase angles relative to reference voltages and differential current values;
closing a current test terminal;
drawing a high-voltage side line current vector diagram and a low-voltage side line current vector diagram of the differential protection of the transformer according to the tested data so as to detect whether the wiring of a differential protection loop is correct or not; or checking the polarity of the Watt meter, confirming the inlet end of current or voltage, and leading the three-phase voltage consistent with the phase sequence of the voltage applied to the primary side of the main transformer to the side of the Watt meter;
sequentially and respectively connecting the detected primary and secondary three-phase currents into a watt meter current coil and a watt meter, sequentially reading and recording the watt meter readings;
when the wattmeter indicates a negative value, the voltage wiring is exchanged, and the measured current vector is projected on the voltage vector; when the reading of the watt meter is positive, the projection of the watt meter and the voltage vector are in the same direction; otherwise, the voltage vector is in the same direction as the negative direction;
making a current vector hexagonal chart of the differential circuit according to the measured data so as to detect whether the wiring of the differential protection circuit is correct;
when the transformer type is a balanced traction transformer or a single-phase traction transformer, the step of measuring the differential protection circuit of the main transformer according to the type of the transformer to detect whether the wiring of the differential protection circuit is correct comprises the following steps:
the secondary side current is connected into a differential relay after passing through a current phase-shifting converter, a testing instrument is connected in series at a terminal of the differential relay, and a phasor diagram is drawn according to measured phase-shifted data;
detecting whether the feeder line protection loop is correctly connected according to the phase value and the current value of the three-phase current; the step of detecting whether the feeder protection loop is correctly wired according to the phase value and the current value of the three-phase current comprises the following steps:
the main transformer secondary side circuit breaker and the feeder circuit breaker are positioned separately, and the 27.5kV bus contact isolating switch and the voltage transformer isolating switch are in a closed state;
an adjustable resistor or an electric furnace is connected in series between the outlet side of the feeder current transformer of the corresponding phase and the grounding electrode, and alternating current 220V voltage is applied between an A-phase bus of 27.5kV and the grounding electrode;
observing and recording the current value of the loop; the voltage and current terminals of the phase meter and the milliamp meter are connected in parallel and in series respectively at the back voltage and current connecting terminals of the phase feeder protection device of the feeder protection screen A according to the same name;
reading and recording display values of a phase meter and a milliamp meter; judging whether the wiring of the alternating voltage and current loop of the feeder line protection device is correct or not according to the measured data;
judging whether the wiring of the differential protection circuit is correct or not according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit; the step of judging whether the wiring of the differential protection circuit is correct according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit comprises the following steps:
when the type of the differential relay is a current ratio differential protection device, a current vector diagram is drawn, and when the phase angles of three-phase currents are 120 degrees, positive phase sequences, and the same-phase currents at the high and low voltage sides are equal in size and 180 degrees in phase difference, the differential circuit is judged to be correctly connected; or when the type of the differential relay is a current ratio phase type differential protection device, the current vectors of two differential arms of the corresponding phase of the transformer are the same; in the drawn vector diagram, the phase angles of three-phase currents are 120 degrees, the three-phase currents are in positive phase sequence, the same-phase currents on the high-voltage side and the low-voltage side are equal in magnitude and phase, and the differential circuit connection is judged to be correct;
the current comparison principle of external current balance is adopted, and the current vectors of two differential arms of the corresponding phase of the transformer are required to be 180 degrees different, and the current phase difference of two arms of the same side is 60 degrees;
for the microcomputer type differential protection device, the current phase comparison principle is adopted to judge that the current vectors of two differential arms of the corresponding phase of the transformer are the same, and the current phase difference of two arms on the same side is 60 degrees;
and judging whether the wiring of the differential protection loop is correct according to whether the test results of the differential protection of the two main transformers are consistent.
2. The method for detecting low voltage energization of a railway traction substation according to claim 1, wherein before the step of measuring a main transformer differential protection circuit according to a type of a transformer to detect whether or not wiring of the differential protection circuit is correct, further comprising:
checking whether the primary equipment installation wiring of the traction substation is the same as a designed primary main wiring diagram;
detecting whether no one works on all primary equipment and buses; whether the three-phase alternating current power supply is stable;
the incoming line isolating switch of the substation is positioned at the opening position.
3. A low-voltage power-on detection test device for a railway traction substation is characterized by comprising: the first test module is used for measuring a differential protection loop of the main transformer according to the type of the transformer so as to detect whether the wiring of the differential protection loop is correct, wherein the type of the transformer comprises a double-coil transformer, a balance traction transformer and a single-phase traction transformer; the second test module is used for detecting whether the wiring of the feeder protection loop is correct or not according to the phase value and the current value of the three-phase current; the power-on judging module is used for judging whether the wiring of the differential protection circuit is correct or not according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit;
when the transformer type is a double-coil transformer or a single-phase traction transformer, the step of measuring the differential protection circuit of the main transformer according to the type of the transformer to detect whether the wiring of the differential protection circuit is correct comprises the following steps:
shorting the feeder circuit breaker on the secondary side of the main transformer of the railway traction substation to form a closed loop of the whole traction substation;
the method comprises the steps that a main transformer inlet-outlet wire side breaker and a manual isolating switch in front of the inlet-wire side breaker are located at a closing position;
applying alternating current three-phase voltage to the primary side current transformer inlet side of the main transformer through a voltage regulator to enable the alternating current three-phase voltage to be input in positive phase sequence, and measuring current of each phase in sequence;
then, respectively connecting phase meters and milliampere meters from the inlet and outlet ends of the differential protection current test terminals of the main transformer protection disc, opening the current test terminal connecting piece, observing the current meters and the phase meters, and reading corresponding current values, phase angles relative to reference voltages and differential current values;
closing a current test terminal;
drawing a high-voltage side line current vector diagram and a low-voltage side line current vector diagram of the differential protection of the transformer according to the tested data so as to detect whether the wiring of a differential protection loop is correct or not; or checking the polarity of the Watt meter, confirming the inlet end of current or voltage, and leading the three-phase voltage consistent with the phase sequence of the voltage applied to the primary side of the main transformer to the side of the Watt meter;
sequentially and respectively connecting the detected primary and secondary three-phase currents into a watt meter current coil and a watt meter, sequentially reading and recording the watt meter readings;
when the wattmeter indicates a negative value, the voltage wiring is exchanged, and the measured current vector is projected on the voltage vector; when the reading of the watt meter is positive, the projection of the watt meter and the voltage vector are in the same direction; otherwise, the voltage vector is in the same direction as the negative direction;
making a current vector hexagonal chart of the differential circuit according to the measured data so as to detect whether the wiring of the differential protection circuit is correct;
when the transformer type is a balanced traction transformer or a single-phase traction transformer, the step of measuring the differential protection circuit of the main transformer according to the type of the transformer to detect whether the wiring of the differential protection circuit is correct comprises the following steps:
the secondary side current is connected into a differential relay after passing through a current phase-shifting converter, a testing instrument is connected in series at a terminal of the differential relay, and a phasor diagram is drawn according to measured phase-shifted data;
the step of detecting whether the feeder protection loop is correctly wired according to the phase value and the current value of the three-phase current comprises the following steps:
the main transformer secondary side circuit breaker and the feeder circuit breaker are positioned separately, and the 27.5kV bus contact isolating switch and the voltage transformer isolating switch are in a closed state;
an adjustable resistor or an electric furnace is connected in series between the outlet side of the feeder current transformer of the corresponding phase and the grounding electrode, and alternating current 220V voltage is applied between an A-phase bus of 27.5kV and the grounding electrode;
observing and recording the current value of the loop; the voltage and current terminals of the phase meter and the milliamp meter are connected in parallel and in series respectively at the back voltage and current connecting terminals of the phase feeder protection device of the feeder protection screen A according to the same name;
reading and recording display values of a phase meter and a milliamp meter; judging whether the wiring of the alternating voltage and current loop of the feeder line protection device is correct or not according to the measured data;
the step of judging whether the wiring of the differential protection circuit is correct according to the type of the differential protection device, the measurement result of the differential protection circuit and the measurement result of the feeder protection circuit comprises the following steps:
when the type of the differential relay is that when the current ratio differential protection device is adopted, a current vector diagram is drawn, and when the phase angles of three-phase currents are 120 degrees, positive phase sequences, the same-phase currents at the high and low voltage sides are equal in size and 180 degrees in phase difference, the correct wiring of the differential loop is judged; or when the type of the differential relay is a current ratio phase type differential protection device, the current vectors of two differential arms of the corresponding phase of the transformer are the same; in the drawn vector diagram, the phase angles of three-phase currents are 120 degrees, the three-phase currents are in positive phase sequence, the same-phase currents on the high-voltage side and the low-voltage side are equal in magnitude and phase, and the differential circuit connection is judged to be correct;
the current comparison principle of external current balance is adopted, and the current vectors of two differential arms of the corresponding phase of the transformer are required to be 180 degrees different, and the current phase difference of two arms of the same side is 60 degrees;
for the microcomputer type differential protection device, the current phase comparison principle is adopted to judge that the current vectors of two differential arms of the corresponding phase of the transformer are the same, and the current phase difference of two arms on the same side is 60 degrees;
and judging whether the wiring of the differential protection loop is correct according to whether the test results of the differential protection of the two main transformers are consistent.
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| CN113567891B (en) * | 2021-08-05 | 2023-11-17 | 中石化第十建设有限公司 | Transformer differential system test method and test device |
| CN114113715A (en) * | 2021-12-07 | 2022-03-01 | 中国二十冶集团有限公司 | Transformer low-voltage electrifying test device |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19713748A1 (en) * | 1997-04-04 | 1998-10-08 | Omicron Electronics Gmbh | Method and device for testing differential protection relays / systems |
| CN101614778A (en) * | 2009-07-23 | 2009-12-30 | 西安爱邦电气有限公司 | The connection analysis method of electric relay protection circuit |
| CN102095969A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Two-winding conventional transformer differential protection automatic analysis device |
| CN102095974A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for judging correct wiring of differential protection of conventional three-winding transformer |
| CN102095978A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for analyzing wiring of differential protection circuit of main transformer |
| CN102095957A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for analyzing and calibrating wiring of differential protection circuit with single bus |
| CN102095950A (en) * | 2010-11-10 | 2011-06-15 | 中冶建工有限公司 | Overall test and construction method of differential protection system of large-scale transformer |
| CN102095981A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for realizing differential protection CT (Current Transformer) loop wiring analysis of exciting transformer |
| EP2375525A1 (en) * | 2010-04-12 | 2011-10-12 | ABB Technology AG | Method and apparatus for differential protection of an electric connection |
| CN202548258U (en) * | 2012-03-28 | 2012-11-21 | 云南电网公司 | Device for checking alternating current/voltage loop |
| CN104198875A (en) * | 2014-08-20 | 2014-12-10 | 天津二十冶建设有限公司 | Inspection method for transformer differential protection wiring |
| CN106324432A (en) * | 2016-08-30 | 2017-01-11 | 南京南瑞继保电气有限公司 | Single-phase grounding line selection method for small-current grounding system |
| CN106569075A (en) * | 2015-10-10 | 2017-04-19 | 宝山钢铁股份有限公司 | Main transformer and high voltage side cable zero-sequence differential protection polarity test circuit and method |
| CN107294072A (en) * | 2017-07-14 | 2017-10-24 | 积成软件有限公司 | A kind of optical fiber longitudinal differential protection method for being applied to 3/2 wiring TA saturations |
| CN207067278U (en) * | 2017-07-20 | 2018-03-02 | 中国三冶集团有限公司 | A kind of novel transformer group and current phase experimental bench |
-
2018
- 2018-10-16 CN CN201811202658.5A patent/CN109283421B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19713748A1 (en) * | 1997-04-04 | 1998-10-08 | Omicron Electronics Gmbh | Method and device for testing differential protection relays / systems |
| CN101614778A (en) * | 2009-07-23 | 2009-12-30 | 西安爱邦电气有限公司 | The connection analysis method of electric relay protection circuit |
| CN102095969A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Two-winding conventional transformer differential protection automatic analysis device |
| CN102095974A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for judging correct wiring of differential protection of conventional three-winding transformer |
| CN102095978A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for analyzing wiring of differential protection circuit of main transformer |
| CN102095957A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for analyzing and calibrating wiring of differential protection circuit with single bus |
| CN102095981A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for realizing differential protection CT (Current Transformer) loop wiring analysis of exciting transformer |
| EP2375525A1 (en) * | 2010-04-12 | 2011-10-12 | ABB Technology AG | Method and apparatus for differential protection of an electric connection |
| CN102095950A (en) * | 2010-11-10 | 2011-06-15 | 中冶建工有限公司 | Overall test and construction method of differential protection system of large-scale transformer |
| CN202548258U (en) * | 2012-03-28 | 2012-11-21 | 云南电网公司 | Device for checking alternating current/voltage loop |
| CN104198875A (en) * | 2014-08-20 | 2014-12-10 | 天津二十冶建设有限公司 | Inspection method for transformer differential protection wiring |
| CN106569075A (en) * | 2015-10-10 | 2017-04-19 | 宝山钢铁股份有限公司 | Main transformer and high voltage side cable zero-sequence differential protection polarity test circuit and method |
| CN106324432A (en) * | 2016-08-30 | 2017-01-11 | 南京南瑞继保电气有限公司 | Single-phase grounding line selection method for small-current grounding system |
| CN107294072A (en) * | 2017-07-14 | 2017-10-24 | 积成软件有限公司 | A kind of optical fiber longitudinal differential protection method for being applied to 3/2 wiring TA saturations |
| CN207067278U (en) * | 2017-07-20 | 2018-03-02 | 中国三冶集团有限公司 | A kind of novel transformer group and current phase experimental bench |
Non-Patent Citations (2)
| Title |
|---|
| New smart multi-ended differential: Solution for power networks;Joao Jesus 等;《2017 Inernational conference on Modern Power Systems》;第1-6页 * |
| 用六角图检验变压器差动保护回路接线正误的方法研究;刘增辉 等;《机电信息》;第66-68页 * |
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