CN110095665B - Method for testing an electrical system circuit formed by busbars connected by tie switches - Google Patents
Method for testing an electrical system circuit formed by busbars connected by tie switches Download PDFInfo
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- CN110095665B CN110095665B CN201810099855.2A CN201810099855A CN110095665B CN 110095665 B CN110095665 B CN 110095665B CN 201810099855 A CN201810099855 A CN 201810099855A CN 110095665 B CN110095665 B CN 110095665B
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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
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Abstract
The invention relates to a method for testing an electric loop formed by two sections of buses connected by a tie switch. Including familiar electrical systems and their schematics; checking two sections of buses, a wire inlet switch, a connection switch and all feed-out switches; changing the interconnection switch to a hot standby state; introducing a three-phase low-voltage power supply to a No. 1 incoming line; changing the No. 1 incoming line switch and the No. 2 incoming line switch into an operating state; respectively measuring and recording voltages at the power receiving sides of the two incoming line switches, and judging; changing the interconnection switch into an operation state; respectively measuring and recording voltages at the power receiving sides of the two incoming line switches, and judging; and measuring voltage at the power receiving side of the incoming line switch of each of the two sections of buses. The invention only needs one low-voltage test power supply; the device has wide application range from low voltage to high voltage, and is suitable for three-phase three-wire systems and three-phase four-wire systems; the direct connection error of the two sections of buses at the position of the interconnection switch and the phase connection error of the buses at the two sides of the interconnection switch can be rapidly found during installation, and the safety of the system is greatly improved.
Description
Technical Field
The invention relates to the field of electric system loop detection, in particular to a method for testing an electric system loop formed by buses connected through a tie switch.
Background
In high and low voltage power supply and distribution systems, in order to ensure the normal operation of important loads on each section of bus and improve the reliability of power supply, the primary or secondary buses of the system are usually connected through a tie switch. The premise of safe input of the interconnection switch between the two sections of buses is that the phases of the two sections of buses are consistent and the loop connection is correct. The conventional inspection method is: two independent power supplies with confirmed phase relation are used for supplying power to respective buses, and the phase of the two power supplies is measured at the position of a communication switch fracture, so that the accuracy of loop connection is ensured. This method has the following disadvantages: (1) two power supplies are needed, and the operation is troublesome; (2) for two buses installed in the same column, the problem of error installation of the interconnection switch due to the fact that the two buses are directly communicated to short-circuit the interconnection switch is not easy to find in the installation process of the interconnection switch; (3) for two rows of buses with opposite disc surfaces, the problem of phase connection errors of the buses on the two sides of the interconnection switch is not easy to find, and the interconnection switch is possibly subjected to interphase short circuit at the closing moment.
Disclosure of Invention
The invention aims to overcome the defects and provide a simple, efficient and accurate testing method.
In order to achieve the above object, the present invention is realized by:
a test method of an electrical system loop formed by buses connected through interconnection switches comprises the following steps of 1, dividing an electrical system into 1 section of buses, 2 sections of buses, interconnection switches among the buses, a No. 1 incoming line for supplying power to the 1 section of buses, a No. 2 incoming line for supplying power to the 2 section of buses and respective feed-out loops of the two sections of buses according to an electrical system schematic diagram;
step 2, checking the two sections of buses, the incoming line switch, the interconnection switch and all the output switches;
step 3, changing the interconnection switch into a hot standby state;
step 4, introducing a three-phase low-voltage power supply to No. 1 incoming line;
step 5, changing the No. 1 incoming line switch and the No. 2 incoming line switch into an operating state;
step 6, respectively measuring and recording voltages at the power receiving sides of the two incoming line switches, wherein the measurement results meet the relationship shown in the table 1, and the phase voltage measurement in the table 1 is not carried out on the three-phase three-line system;
table 1: measurement result when No. 1 incoming line runs and interconnection switch is disconnected
| UA1-UB1 | UB1-UC1 | UC1-UA1 | UA2-UB2 | UB2-UC2 | UC2-UA2 |
| Testing power line voltage values | Testing power line voltage values | Testing power line voltage values | 0 | 0 | 0 |
| UA1-UN1 | UB1-UN1 | UC1-UN1 | UA2-UN2 | UB2-UN2 | UC2-UN2 |
| Phase voltage value of test power supply | Phase voltage value of test power supply | Phase voltage value of test power supply | 0 | 0 | 0 |
Step 7, changing the interconnection switch into an operation state;
step 8, respectively measuring and recording voltages at the power receiving sides of the two incoming line switches, wherein the measurement results meet the relationship of the following table 2, and the phase voltage measurement in the table 2 is not performed on the three-phase three-line system;
table 2: 1. self voltage measurement result of each section of bus when No. 2 incoming line and interconnection switch are in running state
And 9, measuring the voltage at the power receiving side of the incoming line switch of each of the two sections of buses, wherein the measurement result meets the relationship shown in the following table 3.
Table 3: 1. voltage measurement result between two buses when No. 2 incoming line and interconnection switch are both in running state
| UA2 | UB2 | UC2 | |
| UA1 | 0 | Testing power line voltage values | Testing power line voltage values |
| UB1 | Testing power line voltage values | 0 | Testing power line voltage values |
| UC1 | Testing power line voltage values | Testing power line voltage values | 0 |
The method for testing the electric system loop formed by the buses connected through the tie switch comprises the following substeps in step 2:
step 2.1, checking the connection condition of the bus and the switch, and ensuring that all installation work of the system is finished and an insulation test is finished;
step 2.2, checking that each incoming line switch, each interconnection switch and each outgoing feed switch are in a segmented state, a bus is not electrified, and the incoming side of each incoming line switch power supply is not connected with an external cable;
step 2.3, when one section of bus is connected with the interconnection switch through the disconnecting switch, the disconnecting switch is changed into a running state, and when two sections of buses are directly connected with the interconnection switch, the operation is not carried out; and 2.4, testing the insulation between each section of bus line and the ground by using a low-voltage megohmmeter, wherein the insulation resistance needs to meet the test requirement.
The method for testing the electric system loop formed by the buses connected through the interconnection switch further comprises the step of breaking the two paths of the incoming line switches and the interconnection switch, and deactivating and removing the test power supply after the step 9.
By adopting the scheme to test the electric system loop formed by the buses connected through the interconnection switch, compared with the prior art, the testing device has the following advantages and positive effects: only one low-voltage test power supply is needed; the device has wide application range from low voltage to high voltage, and is suitable for three-phase three-wire systems and three-phase four-wire systems; the phase position between the two sections of buses and the correct connection between the buses and the interconnection switch can be ensured, and the safety of the system is greatly improved.
Drawings
FIG. 1 is a schematic diagram of two bus bars connected by tie switches that may be used in the present invention.
Fig. 2 is a schematic diagram of the test of the two incoming switches in the invention when the two incoming switches are in the running state and the interconnection switch is in the sectional position.
Fig. 3 is a schematic test diagram of the two incoming switches and the interconnection switch in the invention when both are in the operating state.
Detailed Description
The invention is further illustrated by the following specific examples.
A test method of an electrical system loop formed by buses connected through interconnection switches comprises the following steps of 1, dividing an electrical system into 1 section of buses, 2 sections of buses, interconnection switches among the buses, a No. 1 incoming line for supplying power to the 1 section of buses, a No. 2 incoming line for supplying power to the 2 section of buses and respective feed-out loops of the two sections of buses according to an electrical system schematic diagram;
step 2, checking the two sections of buses, the incoming line switch, the interconnection switch and all the output switches;
step 3, changing the interconnection switch into a hot standby state;
step 4, introducing a three-phase low-voltage power supply to No. 1 incoming line;
step 5, changing the No. 1 incoming line switch and the No. 2 incoming line switch into an operating state;
step 6, respectively measuring and recording voltages at the power receiving sides of the two incoming line switches, wherein the measurement results meet the relationship shown in the table 1, and the phase voltage measurement in the table 1 is not carried out on the three-phase three-line system;
table 1: measurement result when No. 1 incoming line runs and interconnection switch is disconnected
| UA1-UB1 | UB1-UC1 | UC1-UA1 | UA2-UB2 | UB2-UC2 | UC2-UA2 |
| Testing power line voltage values | Testing power line voltage values | Testing power line voltage values | 0 | 0 | 0 |
| UA1-UN1 | UB1-UN1 | UC1-UN1 | UA2-UN2 | UB2-UN2 | UC2-UN2 |
| Phase voltage value of test power supply | Phase voltage value of test power supply | Phase voltage value of test power supply | 0 | 0 | 0 |
Step 7, changing the interconnection switch into an operation state;
step 8, respectively measuring and recording voltages at the power receiving sides of the two incoming line switches, wherein the measurement results meet the relationship of the following table 2, and the phase voltage measurement in the table 2 is not performed on the three-phase three-line system;
table 2: 1. self voltage measurement result of each section of bus when No. 2 incoming line and interconnection switch are in running state
And 9, measuring the voltage at the power receiving side of the incoming line switch of each of the two sections of buses, wherein the measurement result meets the relationship shown in the following table 3.
Table 3: 1. voltage measurement result between two buses when No. 2 incoming line and interconnection switch are both in running state
| UA2 | UB2 | UC2 | |
| UA1 | 0 | Testing power line voltage values | Testing power line voltage values |
| UB1 | Testing power line voltage values | 0 | Testing power line voltage values |
| UC1 | Testing power line voltage values | Testing power line voltage values | 0 |
The method for testing the electric system loop formed by the buses connected through the tie switch comprises the following substeps in step 2:
step 2.1, checking the connection condition of the bus and the switch, and ensuring that all installation work of the system is finished and an insulation test is finished;
step 2.2, checking that each incoming line switch, each interconnection switch and each outgoing feed switch are in a segmented state, a bus is not electrified, and the incoming side of each incoming line switch power supply is not connected with an external cable;
and 2.3, changing the isolating switch between the 2 sections of buses and the interconnection switch into a running state.
And 2.4, testing the insulation between each section of bus line and the ground by using a low-voltage megohmmeter, wherein the insulation resistance needs to meet the test requirement.
The method for testing the electric system loop formed by the buses connected through the interconnection switch further comprises the step of breaking the two paths of the incoming line switches and the interconnection switch, and deactivating and removing the test power supply after the step 9.
By adopting the scheme to test the electric system loop formed by the buses connected through the interconnection switch, compared with the prior art, the testing device has the following advantages and positive effects: only one low-voltage test power supply is needed; the device has wide application range from low voltage to high voltage, and is suitable for three-phase three-wire systems and three-phase four-wire systems; the phase position between the two sections of buses and the correct connection between the buses and the interconnection switch can be ensured, and the safety of the system is greatly improved.
Claims (3)
1. A test method for an electric system loop formed by buses connected through a tie switch is characterized in that: comprises that
Step 1, dividing an electrical system into 1 section of buses, 2 sections of buses, an inter-bus contact switch, a No. 1 incoming line for supplying power to the 1 section of buses, a No. 2 incoming line for supplying power to the 2 section of buses and respective feed-out loops of the two sections of buses according to an electrical system schematic diagram;
step 2, checking the two sections of buses, the incoming line switch, the interconnection switch and all the output switches;
step 3, changing the interconnection switch into a hot standby state;
step 4, introducing a three-phase low-voltage power supply to No. 1 incoming line;
step 5, changing the No. 1 incoming line switch and the No. 2 incoming line switch into an operating state;
step 6, respectively measuring and recording voltages at the power receiving sides of the two incoming line switches, wherein the measurement results meet the relationship shown in the table 1, and the phase voltage measurement in the table 1 is not carried out on the three-phase three-line system;
table 1: measurement result when No. 1 incoming line runs and interconnection switch is disconnected
Step 7, changing the interconnection switch into an operation state;
step 8, respectively measuring and recording voltages at the power receiving sides of the two incoming line switches, wherein the measurement results meet the relationship of the following table 2, and the phase voltage measurement in the table 2 is not performed on the three-phase three-line system;
table 2: 1. self voltage measurement result of each section of bus when No. 2 incoming line and interconnection switch are in running state
Step 9, measuring voltage on the power receiving side of the incoming line switch of each of the two sections of buses, wherein the measurement result meets the relationship shown in the following table 3;
table 3: 1. voltage measurement result between two buses when No. 2 incoming line and interconnection switch are both in running state
。
2. The method of claim 1 for testing an electrical system circuit formed by busbars connected by tie switches, the method comprising: the step 2 comprises the following substeps:
step 2.1, checking the connection condition of the bus and the switch, and ensuring that all installation work of the system is finished and an insulation test is finished;
step 2.2, checking that each incoming line switch, each interconnection switch and each outgoing feed switch are in a segmented state, a bus is not electrified, and the incoming side of each incoming line switch power supply is not connected with an external cable;
step 2.3, when one section of bus is connected with the interconnection switch through the disconnecting switch, the disconnecting switch is changed into a running state, and when two sections of buses are directly connected with the interconnection switch, the operation is not carried out;
and 2.4, testing the insulation between each section of bus line and the ground by using a low-voltage megohmmeter, wherein the insulation resistance needs to meet the test requirement.
3. The method of claim 1 for testing an electrical system circuit formed by busbars connected by tie switches, the method comprising: and step 9, breaking the two incoming line switches and the interconnection switch, and deactivating and removing the test power supply.
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| CN201810099855.2A CN110095665B (en) | 2018-01-31 | 2018-01-31 | Method for testing an electrical system circuit formed by busbars connected by tie switches |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201413939Y (en) * | 2009-05-18 | 2010-02-24 | 深圳市深开电器实业有限公司 | Electrical interlocking system of inlet wire and interconnection switch for switch apparatus |
| CN102213735A (en) * | 2011-03-04 | 2011-10-12 | 中国电力科学研究院 | Typical test network with power distribution automation |
| CN202260153U (en) * | 2011-10-14 | 2012-05-30 | 湖北长江电气有限公司 | Low voltage distribution two-input one-connect electrical interlock system |
| CN103217624A (en) * | 2013-03-18 | 2013-07-24 | 国家电网公司 | Power distribution network reliability assessment state labeling method based on segments |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6633237B2 (en) * | 2001-02-05 | 2003-10-14 | Analog Devices, Inc. | Methods and apparatus for data transfer in electronic energy meters |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201413939Y (en) * | 2009-05-18 | 2010-02-24 | 深圳市深开电器实业有限公司 | Electrical interlocking system of inlet wire and interconnection switch for switch apparatus |
| CN102213735A (en) * | 2011-03-04 | 2011-10-12 | 中国电力科学研究院 | Typical test network with power distribution automation |
| CN202260153U (en) * | 2011-10-14 | 2012-05-30 | 湖北长江电气有限公司 | Low voltage distribution two-input one-connect electrical interlock system |
| CN103217624A (en) * | 2013-03-18 | 2013-07-24 | 国家电网公司 | Power distribution network reliability assessment state labeling method based on segments |
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