CN110554297A - method for checking differential protection current loop of large high-voltage motor by using low-voltage electricity - Google Patents
method for checking differential protection current loop of large high-voltage motor by using low-voltage electricity Download PDFInfo
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- CN110554297A CN110554297A CN201810561489.8A CN201810561489A CN110554297A CN 110554297 A CN110554297 A CN 110554297A CN 201810561489 A CN201810561489 A CN 201810561489A CN 110554297 A CN110554297 A CN 110554297A
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2827—Testing of electronic protection circuits
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- Control Of Ac Motors In General (AREA)
Abstract
A method for checking a differential protection current loop of a large high-voltage motor by using low-voltage electricity comprises the following steps: firstly, selecting a test power cable; determining that the polarity wiring of the current transformer is correct: the three-phase 400V low-voltage alternating current is connected into a primary circuit of the motor, the winding of the motor generates induced current at the moment, the measured values of the secondary connection are the same, and the current difference value in the differential protection device I is zero; thirdly, simulating the action condition of the differential protection device I under the condition of short circuit, namely disconnecting the A-phase 400V alternating current power supply, generating three-phase unbalanced current in a motor winding at the moment, generating differential current I in the A-phase in the differential protection device I, and setting a smaller value for the differential action value in the protection device I to simulate the action condition; and fourthly, the alternating current power supplies of the B phase and the C phase are respectively disconnected, and the phase differential protection action conditions of the B phase and the C phase can be simulated according to the steps. By using the method, the verification of the differential protection circuit can be completed before the motor is in test operation, and the verification is not required to be performed under full load.
Description
The technical field is as follows:
The invention belongs to a method for starting and debugging a large high-voltage motor in electrical equipment installation engineering, and particularly relates to a method for checking a differential protection current loop of the large high-voltage motor by using low-voltage electricity.
Background art:
The large-scale high-voltage motor is widely applied to the fields of metallurgy, chemical engineering and the like, provides power for large-scale equipment such as blowers, compressors and the like, and is particularly important for current differential protection of the motor because the equipment is expensive. In order to ensure reliable operation of the electrical protection device, the current differential protection circuit of the motor must be accurate. In the prior starting and debugging, the differential protection is usually quitted, after a certain load is reached, the differential protection circuit is used after a check test is carried out, and the safety of the large-sized motor in the starting and debugging process cannot be ensured.
The invention content is as follows:
the present invention is directed to overcome the above-mentioned deficiencies in the prior art, and provides a method for checking a differential protection current loop of a large-sized high-voltage motor by using a low-voltage capacitor, which can complete the checking of the differential protection current loop before the motor is run-in, and does not need to be performed under full load, thereby ensuring the safety of the large-sized motor during start-up and debugging.
As conceived above, the technical scheme of the invention is as follows: a method for checking a differential protection current loop of a large high-voltage motor by using low-voltage electricity is characterized by comprising the following steps of: the method comprises the following steps:
firstly, selecting a test power cable;
determining that the polarity wiring of the current transformer is correct: the three-phase 400V low-voltage alternating current is connected into a primary circuit of the motor, the winding of the motor generates induced current at the moment, the three-phase current is respectively measured by using a current meter, if the polarity of a transformer is correct, the measured values of the secondary connection are the same, namely A1 is A2 is A3, and the current difference value in a differential protection device I is zero, namely I is 0; if the polarity of the current line is reverse, differential current is generated in the differential protection device I;
Thirdly, simulating the action condition of the differential protection device I under the condition of short circuit, namely disconnecting the A-phase 400V alternating current power supply, generating three-phase unbalanced current in a motor winding at the moment, namely A1 is 0, A2 is A3, generating differential current I in the A-phase in the differential protection device I, and setting a small value for the differential action value in the protection device I to simulate the action condition;
and fourthly, the B and C alternating current power supplies are disconnected respectively, the B and C phase differential protection action conditions can be simulated according to the steps, and the correctness of the differential protection current loop is verified.
The invention relates to a method for verifying a current protection loop by applying alternating current 400V low-voltage electricity to the upper end of a current transformer to generate current in a motor winding. The method is simple to operate, few in used instruments, the verification of the differential protection circuit can be completed before the motor is in test operation, the verification is not required to be carried out under full load, and the safety of the large motor during starting and debugging is ensured.
description of the drawings:
FIG. 1 is a wiring diagram of the present invention.
the specific implementation mode is as follows:
As shown in the figure: a method for checking a differential protection current loop of a large high-voltage motor by using low-voltage electricity comprises the following steps:
1. selecting a test power cable: selecting a low-voltage alternating current power supply cable according to the capacity of the motor, so that the cross section area of the cable can meet the requirement of induced current of the motor;
2. and (3) determining that the polarity wiring of the current transformer is correct: the three-phase 400V low-voltage alternating current is connected into a primary circuit of the motor, the winding of the motor generates induced current at the moment, the three-phase current is respectively measured by using a current meter, if the polarity of a transformer is correct, the measured values of the secondary connection are the same, namely A1 is A2 is A3, and the current difference value in a differential protection device I is zero, namely I is 0; if the polarity of the current line is reverse, differential current is generated in the differential protection device I;
3. the operation condition of the differential protection device I is simulated under the condition of short circuit, namely, a 400V alternating current power supply of the phase A is disconnected, three-phase unbalanced current is generated in a motor winding at the moment, namely A1 is equal to 0, A2 is equal to A3, the phase A in the differential protection device I generates differential current I, the operation condition can be simulated by setting a small differential action value in the protection device I, and the operation condition of a differential protection current loop is correct through simulation;
4. And respectively disconnecting the B and C alternating current power supplies, simulating the B and C phase differential protection action condition according to the steps, and verifying the correctness of the differential protection current loop.
Claims (1)
1. A method for checking a differential protection current loop of a large high-voltage motor by using low-voltage electricity is characterized by comprising the following steps of: the method comprises the following steps:
firstly, selecting a test power cable;
Determining that the polarity wiring of the current transformer is correct: the three-phase 400V low-voltage alternating current is connected into a primary circuit of the motor, the winding of the motor generates induced current at the moment, the three-phase current is respectively measured by using a current meter, if the polarity of a transformer is correct, the measured values of the secondary connection are the same, namely A1 is A2 is A3, and the current difference value in a differential protection device I is zero, namely I is 0; if the polarity of the current line is reverse, differential current is generated in the differential protection device I;
Thirdly, simulating the action condition of the differential protection device I under the condition of short circuit, namely disconnecting the A-phase 400V alternating current power supply, generating three-phase unbalanced current in a motor winding at the moment, namely A1 is 0, A2 is A3, generating differential current I in the A-phase in the differential protection device I, and setting a small value for the differential action value in the protection device I to simulate the action condition;
and fourthly, the B and C alternating current power supplies are disconnected respectively, the B and C phase differential protection action conditions can be simulated according to the steps, and the correctness of the differential protection current loop is verified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561489.8A CN110554297A (en) | 2018-06-04 | 2018-06-04 | method for checking differential protection current loop of large high-voltage motor by using low-voltage electricity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561489.8A CN110554297A (en) | 2018-06-04 | 2018-06-04 | method for checking differential protection current loop of large high-voltage motor by using low-voltage electricity |
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| CN110554297A true CN110554297A (en) | 2019-12-10 |
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| CN201810561489.8A Pending CN110554297A (en) | 2018-06-04 | 2018-06-04 | method for checking differential protection current loop of large high-voltage motor by using low-voltage electricity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965005A (en) * | 2021-02-04 | 2021-06-15 | 西安热工研究院有限公司 | System and method for verifying differential protection polarity by using dummy load |
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| UA87753C2 (en) * | 2007-12-10 | 2009-08-10 | Открытое Акционерное Общество "Мариупольский Металлургический Комбинат Им. Ильича" | Device for differential proteсtion of electric motors against overloads |
| CN201852924U (en) * | 2010-10-29 | 2011-06-01 | 中冶天工集团有限公司 | Polarity relationship inspecting device for differential protection current of electric motor |
| CN104267276A (en) * | 2014-09-23 | 2015-01-07 | 中冶天工上海十三冶建设有限公司 | Method for inspecting high-voltage motor longitudinal differential protection by means of low-voltage locked-rotor currents |
| CN107045116A (en) * | 2017-04-01 | 2017-08-15 | 云南电网有限责任公司 | The current transformer polarity detection method and device of a kind of generator protection |
| CN107478943A (en) * | 2017-08-09 | 2017-12-15 | 大唐东北电力试验研究所有限公司 | Detect the method and device of differential protection for generator polarity |
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2018
- 2018-06-04 CN CN201810561489.8A patent/CN110554297A/en active Pending
Patent Citations (5)
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| UA87753C2 (en) * | 2007-12-10 | 2009-08-10 | Открытое Акционерное Общество "Мариупольский Металлургический Комбинат Им. Ильича" | Device for differential proteсtion of electric motors against overloads |
| CN201852924U (en) * | 2010-10-29 | 2011-06-01 | 中冶天工集团有限公司 | Polarity relationship inspecting device for differential protection current of electric motor |
| CN104267276A (en) * | 2014-09-23 | 2015-01-07 | 中冶天工上海十三冶建设有限公司 | Method for inspecting high-voltage motor longitudinal differential protection by means of low-voltage locked-rotor currents |
| CN107045116A (en) * | 2017-04-01 | 2017-08-15 | 云南电网有限责任公司 | The current transformer polarity detection method and device of a kind of generator protection |
| CN107478943A (en) * | 2017-08-09 | 2017-12-15 | 大唐东北电力试验研究所有限公司 | Detect the method and device of differential protection for generator polarity |
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| 吉林电气化专科学校 丁昱主编: "《中等专业学校教学用书 工业企业供电 （修订版）》", 30 June 1982 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965005A (en) * | 2021-02-04 | 2021-06-15 | 西安热工研究院有限公司 | System and method for verifying differential protection polarity by using dummy load |
| CN112965005B (en) * | 2021-02-04 | 2023-06-27 | 西安热工研究院有限公司 | System and method for verifying differential protection polarity by using dummy load |
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Application publication date: 20191210 |