CN113589214B - CT (computed tomography) secondary through-flow method for power plant - Google Patents
CT (computed tomography) secondary through-flow method for power plant Download PDFInfo
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- CN113589214B CN113589214B CN202110898253.5A CN202110898253A CN113589214B CN 113589214 B CN113589214 B CN 113589214B CN 202110898253 A CN202110898253 A CN 202110898253A CN 113589214 B CN113589214 B CN 113589214B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002591 computed tomography Methods 0.000 title description 79
- 238000000819 phase cycle Methods 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 230000007547 defect Effects 0.000 claims description 12
- 230000009466 transformation Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000011065 in-situ storage Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
-
- 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
Abstract
The invention relates to a CT secondary through-flow method for a power plant, which comprises the following steps: all current loops of each CT are connected in series, and during a CT secondary through-flow test, the correctness and the integrity of wiring of all CT secondary loops are checked by applying current to one position of a certain local terminal box; the correctness of the CT secondary circuit is further checked by respectively applying currents with different amplitudes and phase sequences, and the correctness of the transformer group protection cabinet, the fault wave recording cabinet, the DCS background sampling and the parameter setting are checked at the same time. According to the invention, through-flow is not needed to be carried out at each CT terminal, so that the test efficiency is improved, the practicability is high, and the method is suitable for electric main systems of different power plants.
Description
Technical Field
The invention relates to the technical field of power tests, in particular to a CT secondary through-flow method for a power plant.
Background
Before the unit is put into operation or when the unit is overhauled, the wiring, transformation ratio, accuracy level, polarity and the like of a CT (current transformer) of the whole plant are required to be checked and confirmed, the correctness of a CT body and a secondary circuit is ensured, no open circuit phenomenon exists, otherwise, the safe and stable operation of a power system is influenced, and the CT secondary current is a necessary test item.
The current common CT secondary through-flow method is carried out in a CT body terminal box, and the test is carried out by respectively carrying out secondary through-flow on each phase of each group of CT.
Disclosure of Invention
The invention aims to provide a CT secondary through-flow method for a power plant, which can finish the secondary through-flow of all CTs of the power plant at the same time only by short-circuiting wires, thereby greatly saving time and labor.
The invention provides a CT secondary through-flow method for a power plant, which comprises the following steps:
all current loops of each CT are connected in series, and the correctness and the integrity of wiring of all CT secondary loops are checked by applying current to one position of a certain local terminal box during CT secondary through-flow test.
Further, the method further comprises:
the correctness of the CT secondary circuit is further checked by respectively applying currents with different amplitudes and phase sequences, and the correctness of the transformer group protection cabinet, the fault wave recording cabinet, the DCS background sampling and the parameter setting are checked at the same time.
Further, the local terminal box comprises a CT body terminal box No. 1 and a CT body terminal box No. 2; the CT body terminal box No. 1 is sequentially provided with a terminal a4011, a terminal B4011, a terminal C4011, a terminal N4011A, a terminal N4011B, a terminal N4011C, a terminal a4021, a terminal B4021, a terminal C4021, a terminal N4021B, a terminal N4021C, a terminal a4031, a terminal B4031, a terminal C4031, a terminal N4031A, a terminal N4031B, a terminal N4031C, a terminal a4041, a terminal B4041, a terminal C4041, a terminal N4041A, a terminal N4041B, and a terminal N4041C; the CT main body terminal box No. 2 is sequentially provided with a terminal a4051, a terminal B4051, a terminal C4051, a terminal N4051A, a terminal N4051B, a terminal N4051C, a terminal a4061, a terminal B4061, a terminal C4061, a terminal N4061A, a terminal N4061B, a terminal N4061C, a terminal a4071, a terminal B4071, a terminal C4071, a terminal N4071A, a terminal N4071B, a terminal N4071C, a terminal a4081, a terminal B4081, a terminal N4081A, a terminal N4081B, and a terminal N4081C, and the specific through-flow method is as follows:
1) All CT connecting pieces except for the vertical long connecting piece among the terminal N4081A, the terminal N4081B and the terminal N4081C in the CT body terminal box No. 2 are disconnected, so that current induced by the primary side during secondary side through-flow is avoided, and meanwhile, the independence among all phases of currents is ensured;
2) A shorting stub is used for connecting the terminal N4011A with the terminal A4021, the terminal N4021A with the terminal A4031, the terminal N4031A with the terminal A4041 in the CT body terminal box No. 1 in sequence;
3) A shorting wire is used for connecting the terminal N4011B and the terminal B4021, the terminal N4021B and the terminal B4031, and the terminal N4031B and the terminal B4041 in the CT body terminal box No. 1 in sequence;
4) A shorting stub is used for connecting the terminal N4011C and the terminal C4021, the terminal N4021C and the terminal C4031, and the terminal N4031C and the terminal C4041 in the CT body terminal box No. 1 in sequence;
5) The terminal N4041A of the CT body terminal box No. 1 and the terminal A4051 of the CT body terminal box No. 2 are connected by a shorting wire;
6) The terminal N4041B of the CT body terminal box No. 1 and the terminal B4051 of the CT body terminal box No. 2 are connected by a shorting wire;
7) The terminal N4041C of the CT body terminal box No. 1 and the terminal C4051 of the CT body terminal box No. 2 are connected by a shorting wire;
8) A shorting stub is used for connecting the terminal N4051A with the terminal A4061, the terminal N4061A with the terminal A4071, the terminal N4071A with the terminal A4081 in the CT body terminal box number 2 in sequence;
9) A shorting wire is used for connecting the terminal N4051B and the terminal B4061, the terminal N4061B and the terminal B4071, the terminal N4071B and the terminal B4081 in the CT body terminal box No. 2 in sequence;
10 A shorting stub is used to connect the terminal N4051C and the terminal C4061, the terminal N4061C and the terminal C4071, the terminal N4071C and the terminal C4081 in the CT body terminal box No. 2 in sequence;
11A current output terminal A, B, C of the relay protection tester is connected to a terminal A4011, a terminal B4011 and a terminal C4011 of a CT body terminal box number 1 respectively, and a current output terminal N of the relay protection tester is connected to a terminal N4081A of a CT body terminal box number 2;
12 A, B, C three-phase currents with different amplitudes and phases are output by a relay protection device;
13 Reading and recording current amplitude and phase through the transformer group protection cabinet, the fault wave recording cabinet and the DCS background respectively, judging whether the amplitude and the phase are consistent with the output of the relay protection tester, and if yes, entering a step 15); if the judgment result is negative, the step 14) is entered;
14 Closing the relay protection tester, searching and eliminating defects of the CT secondary circuit, the transformer group protection cabinet, the fault wave recording cabinet and the DCS background, and returning to the step 13);
15 For a screen cabinet through which the current loop flows and the current amplitude and the current phase cannot be read, measuring whether the amplitude and the current phase are consistent with the output of the relay protection tester through a clamp ammeter, and if yes, entering a step 17); if the judgment result is negative, the step 16) is entered;
16 Closing the relay protection tester, searching and eliminating the defect of the CT secondary circuit, and returning to the step 15);
17 Adjusting the output current of the relay protection tester to A, B, C three-phase positive sequence rated current;
18 Reading and recording current amplitude and phase through the transformer group protection cabinet, the fault wave recording cabinet and the DCS background respectively, judging whether the amplitude and the phase are consistent with the output of the relay protection tester, and if so, entering a step 20); if the judgment result is negative, the step 19 is entered;
19 Closing the relay protection tester, searching and eliminating defects of the CT secondary circuit, the transformer group protection cabinet, the fault wave recording cabinet and the DCS background, and returning to the step 18);
20 For a screen cabinet through which the current loop flows and the current amplitude and the current phase cannot be read, measuring whether the amplitude and the current phase are consistent with the output of the relay protection tester through a clamp ammeter, and if yes, entering step 22); if the judgment result is negative, the step 21) is entered;
21 Closing the relay protection tester, searching and eliminating the defect of the CT secondary circuit, and returning to the step 20);
22 Closing the relay protection tester, and disconnecting a current output line of the relay protection tester;
23 Removing all shorting bars added in the through-flow process;
24 Restoring all broken tabs.
By means of the scheme, the CT secondary through-flow method of the power plant has the following technical effects:
1) According to the invention, all current loops of each CT are connected in series, so that the correctness and the integrity of wiring of all CT secondary loops can be checked by applying current to one part of a certain local terminal box in a CT secondary through-flow test. And the through flow is not needed to be carried out at each CT terminal, so that the test efficiency is improved.
2) The invention further checks the correctness of the CT secondary circuit by respectively applying currents with different amplitudes and phase sequences, and simultaneously checks the correctness of sampling and parameter setting of devices such as a transformer group protection cabinet, a fault wave recording cabinet, a DCS background and the like.
3) The invention has strong practicability and is suitable for electric main systems of different power plants.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a CT secondary current method of a power plant in an embodiment of the invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The embodiment provides a power plant CT secondary through-flow method, which comprises the following steps:
all current loops of each CT are connected in series, and the correctness and the integrity of wiring of all CT secondary loops are checked by applying current to one position of a certain local terminal box during CT secondary through-flow test.
The correctness of the CT secondary circuit is further checked by respectively applying currents with different amplitudes and phase sequences, and the correctness of the transformer group protection cabinet, the fault wave recording cabinet, the DCS background sampling and the parameter setting are checked at the same time.
Referring to fig. 1 (only the current output line of the relay protection tester and the short-circuit lines added on the terminals are shown in the drawing, and the external CT loop lines of the terminal block are not shown), in a specific embodiment, the specific current through method includes:
1) All CT connecting pieces except for the vertical long connecting piece among the three terminals N4081A, N4081B, N4081C in the CT body terminal box are disconnected, so that current induced on the primary side during secondary side through-flow is avoided, and meanwhile independence among all phases of currents is guaranteed.
2) The N4011A and a4021, the N4021A and a4031, and the N4031A and a4041 are connected in sequence by shorting wires in the CT body terminal box No. 1.
3) The N4011B and B4021, the N4021B and B4031, and the N4031B and B4041 are connected in sequence by shorting wires in the CT body terminal box No. 1.
4) The inside of the CT body terminal box No. 1 is connected with N4011C and C4021, N4021C and C4031, N4031C and C4041 by short-circuit wires in sequence.
5) N4041A of the CT body terminal box No. 1 and A4051 of the CT body terminal box No. 2 are connected by shorting bars.
6) N4041B of the CT body terminal box No. 1 and B4051 of the CT body terminal box No. 2 are connected by shorting bars.
7) N4041C of the CT body terminal box No. 1 and C4051 of the CT body terminal box No. 2 are connected by shorting bars.
8) N4051A and a4061, N4061A and a4071, and N4071A and a4081 are connected in this order with shorting bars in the CT body terminal box No. 2.
9) N4051B and B4061, N4061B and B4071, N4071B and B4081 are connected in sequence with shorting wires in the CT body terminal box No. 2.
10 N4051C and C4061, N4061C and C4071, N4071C and C4081 are connected in sequence with shorting bars in the CT body terminal box No. 2.
11 The relay protection tester current output terminal A, B, C is connected to the positions A4011, B4011 and C4011 of the CT body terminal box No. 1 respectively, and the relay protection tester current output terminal N is connected to the position N4081A of the CT body terminal box No. 2.
12 A, B, C three-phase currents with different amplitudes and phases (positive sequence, zero sequence and negative sequence) are output by the relay protection device.
13 Reading and recording current amplitude and phase through a transformer group protection cabinet, a fault wave recording cabinet, a DCS background and the like, judging whether the amplitude and the phase are consistent with the output of a relay protection tester, and if so, entering a step 15); if the judgment result is negative, the step 14 is entered.
14 Closing the relay protection tester, searching and eliminating the defects of a CT secondary circuit, a transformer group protection cabinet, a fault wave recording cabinet, a DCS background and the like, and returning to the step 13).
15 For a screen cabinet through which the current loop flows and the current amplitude and the current phase cannot be read, measuring whether the amplitude and the current phase are consistent with the output of the relay protection tester through a clamp ammeter, and if yes, entering a step 17); if the judgment result is negative, the step 16 is entered.
16 Closing the relay protection tester, searching and eliminating the defect of the CT secondary circuit, and returning to the step 15).
17 Adjusting the output current of the relay protection tester to A, B, C three-phase positive sequence rated current.
18 Reading and recording current amplitude and phase through a transformer group protection cabinet, a fault wave recording cabinet, a DCS background and the like, judging whether the amplitude and the phase are consistent with the output of a relay protection tester, and if so, entering a step 20); if the judgment result is negative, the step 19 is entered.
19 Closing the relay protection tester, searching and eliminating the defects of a CT secondary circuit, a transformer group protection cabinet, a fault wave recording cabinet, a DCS background and the like, and returning to the step 18).
20 For a screen cabinet through which the current loop flows and the current amplitude and the current phase cannot be read, measuring whether the amplitude and the current phase are consistent with the output of the relay protection tester through a clamp ammeter, and if yes, entering step 22); if the judgment result is negative, the step 21 is entered.
21 Closing the relay protection tester, searching and eliminating the defect of the CT secondary circuit, and returning to the step 20).
22 Closing the relay protection tester, and disconnecting a current output line of the relay protection tester.
23 Removing all shorting bars added during the through-flow process.
24 Restoring all broken tabs.
The invention has the following technical effects:
1) According to the invention, all current loops of each CT are connected in series, so that the correctness and the integrity of wiring of all CT secondary loops can be checked by applying current to one part of a certain local terminal box in a CT secondary through-flow test. And the through flow is not needed to be carried out at each CT terminal, so that the test efficiency is improved.
2) The invention further checks the correctness of the CT secondary circuit by respectively applying currents with different amplitudes and phase sequences, and simultaneously checks the correctness of sampling and parameter setting of devices such as a transformer group protection cabinet, a fault wave recording cabinet, a DCS background and the like.
3) The invention has strong practicability and is suitable for electric main systems of different power plants.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (1)
1. A power plant CT secondary pass flow method, comprising:
all current loops of each CT are connected in series, and during a CT secondary through-flow test, the correctness and the integrity of wiring of all CT secondary loops are checked by applying current to one position of a certain local terminal box;
the correctness of the CT secondary circuit is further checked by respectively applying currents with different amplitudes and phase sequences, and the correctness of the transmission and transformation group protection cabinet, the fault wave recording cabinet, the DCS background sampling and the parameter setting are checked at the same time;
the in-situ terminal box comprises a CT body terminal box No. 1 and a CT body terminal box No. 2; the CT body terminal box No. 1 is sequentially provided with a terminal a4011, a terminal B4011, a terminal C4011, a terminal N4011A, a terminal N4011B, a terminal N4011C, a terminal a4021, a terminal B4021, a terminal C4021, a terminal N4021B, a terminal N4021C, a terminal a4031, a terminal B4031, a terminal C4031, a terminal N4031A, a terminal N4031B, a terminal N4031C, a terminal a4041, a terminal B4041, a terminal C4041, a terminal N4041A, a terminal N4041B, and a terminal N4041C; the CT main body terminal box No. 2 is sequentially provided with a terminal a4051, a terminal B4051, a terminal C4051, a terminal N4051A, a terminal N4051B, a terminal N4051C, a terminal a4061, a terminal B4061, a terminal C4061, a terminal N4061A, a terminal N4061B, a terminal N4061C, a terminal a4071, a terminal B4071, a terminal C4071, a terminal N4071A, a terminal N4071B, a terminal N4071C, a terminal a4081, a terminal B4081, a terminal N4081A, a terminal N4081B, and a terminal N4081C, and the specific through-flow method is as follows:
1) All CT connecting pieces except for the vertical long connecting piece among the terminal N4081A, the terminal N4081B and the terminal N4081C in the CT body terminal box No. 2 are disconnected, so that current induced by the primary side during secondary side through-flow is avoided, and meanwhile, the independence among all phases of currents is ensured;
2) A shorting stub is used for connecting the terminal N4011A with the terminal A4021, the terminal N4021A with the terminal A4031, the terminal N4031A with the terminal A4041 in the CT body terminal box No. 1 in sequence;
3) A shorting wire is used for connecting the terminal N4011B and the terminal B4021, the terminal N4021B and the terminal B4031, and the terminal N4031B and the terminal B4041 in the CT body terminal box No. 1 in sequence;
4) A shorting stub is used for connecting the terminal N4011C and the terminal C4021, the terminal N4021C and the terminal C4031, and the terminal N4031C and the terminal C4041 in the CT body terminal box No. 1 in sequence;
5) The terminal N4041A of the CT body terminal box No. 1 and the terminal A4051 of the CT body terminal box No. 2 are connected by a shorting wire;
6) The terminal N4041B of the CT body terminal box No. 1 and the terminal B4051 of the CT body terminal box No. 2 are connected by a shorting wire;
7) The terminal N4041C of the CT body terminal box No. 1 and the terminal C4051 of the CT body terminal box No. 2 are connected by a shorting wire;
8) A shorting stub is used for connecting the terminal N4051A with the terminal A4061, the terminal N4061A with the terminal A4071, the terminal N4071A with the terminal A4081 in the CT body terminal box number 2 in sequence;
9) A shorting wire is used for connecting the terminal N4051B and the terminal B4061, the terminal N4061B and the terminal B4071, the terminal N4071B and the terminal B4081 in the CT body terminal box No. 2 in sequence;
10 A shorting stub is used to connect the terminal N4051C and the terminal C4061, the terminal N4061C and the terminal C4071, the terminal N4071C and the terminal C4081 in the CT body terminal box No. 2 in sequence;
11A current output terminal A, B, C of the relay protection tester is connected to a terminal A4011, a terminal B4011 and a terminal C4011 of a CT body terminal box number 1 respectively, and a current output terminal N of the relay protection tester is connected to a terminal N4081A of a CT body terminal box number 2;
12 A, B, C three-phase currents with different amplitudes and phases are output by a relay protection device;
13 Reading and recording current amplitude and phase through the transformer group protection cabinet, the fault wave recording cabinet and the DCS background respectively, judging whether the amplitude and the phase are consistent with the output of the relay protection tester, and if yes, entering a step 15); if the judgment result is negative, the step 14) is entered;
14 Closing the relay protection tester, searching and eliminating defects of the CT secondary circuit, the transformer group protection cabinet, the fault wave recording cabinet and the DCS background, and returning to the step 13);
15 For a screen cabinet through which the current loop flows and the current amplitude and the current phase cannot be read, measuring whether the amplitude and the current phase are consistent with the output of the relay protection tester through a clamp ammeter, and if yes, entering a step 17); if the judgment result is negative, the step 16) is entered;
16 Closing the relay protection tester, searching and eliminating the defect of the CT secondary circuit, and returning to the step 15);
17 Adjusting the output current of the relay protection tester to A, B, C three-phase positive sequence rated current;
18 Reading and recording current amplitude and phase through the transformer group protection cabinet, the fault wave recording cabinet and the DCS background respectively, judging whether the amplitude and the phase are consistent with the output of the relay protection tester, and if so, entering a step 20); if the judgment result is negative, the step 19 is entered;
19 Closing the relay protection tester, searching and eliminating defects of the CT secondary circuit, the transformer group protection cabinet, the fault wave recording cabinet and the DCS background, and returning to the step 18);
20 For a screen cabinet through which the current loop flows and the current amplitude and the current phase cannot be read, measuring whether the amplitude and the current phase are consistent with the output of the relay protection tester through a clamp ammeter, and if yes, entering step 22); if the judgment result is negative, the step 21) is entered;
21 Closing the relay protection tester, searching and eliminating the defect of the CT secondary circuit, and returning to the step 20);
22 Closing the relay protection tester, and disconnecting a current output line of the relay protection tester;
23 Removing all shorting bars added in the through-flow process;
24 Restoring all broken tabs.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898253.5A CN113589214B (en) | 2021-08-05 | 2021-08-05 | CT (computed tomography) secondary through-flow method for power plant |
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| CN202110898253.5A CN113589214B (en) | 2021-08-05 | 2021-08-05 | CT (computed tomography) secondary through-flow method for power plant |
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| CN113589214B true CN113589214B (en) | 2024-02-20 |
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