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Harmonic detection of Sichuan Electric Power

Sichuan electric power harmonic detection company and you introduce the application of harmonic control: 1. Limit value of harmonic voltage and allowable value of harmonic current

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Sichuan electric power harmonic detection company Introduce the application of harmonic control to you

1、 Limit value of harmonic voltage and allowable value of harmonic current

1. The harmonic voltage (phase voltage) at any point in the power grid shall not exceed the limit value specified in the specified standard power quality harmonics of public power grid (GB / T14549-93).

2. The harmonic current component injected into the point by all users of the public connection point shall not exceed the allowable value specified in the specified standard power quality harmonics of public power grid (GB / T14549-93).

 Sichuan electric power harmonic detection company

2、 Supervision and measurement of harmonics

1. Harmonic monitoring points are generally selected in main power plants, hub substations and buses with voltage level of 220kV or below connected with a large number of harmonic source loads or capacitor banks. Harmonic monitoring points should be adjusted in time with the development of power grid.

2. The harmonic voltage of harmonic monitoring points and harmonic current of main harmonic source users should be monitored continuously or regularly according to specific conditions.

3. In order to fully grasp the harmonic level of power grid and harmonic characteristics of load, harmonic survey and test are carried out regularly.

4. Before and after large capacity harmonic source equipment and capacitor (or filter) bank are connected to the power grid, special harmonic test shall be conducted to determine the background harmonic condition of power grid, harmonic generation of harmonic source, and influence of capacitor (or filter) bank on harmonic, so as to determine whether it can be formally connected to the grid.

3、 Management and control measures of harmonic source

1. For the existing harmonic sources, the monitoring station should regularly carry out harmonic monitoring, and gradually establish and improve its technical files, and check once every two years.

2. Users who exceed the specified allowable value shall be provided with special line power supply and installed with harmonic protection and monitoring device. For those who have been connected to public line power supply or have been supplied by dedicated line but not installed with harmonic protection and monitoring device, they shall be transformed and improved by users themselves within one year according to the above requirements.

3. The newly installed harmonic protection device shall have current and voltage starting elements, and the protection setting value shall be set according to the standard specified in. The protection device shall be installed at the exit of substation of Power Supply Bureau.

4. When the user's harmonic exceeds the set value and the protection action causes the line switch to trip, the special person in charge of harmonics of the power supply bureau shall inform the user in writing to carry out treatment within a time limit. If the user fails to solve the problem within the time limit, and the protection device acts again and trips, the power supply company shall not resume the power supply until the user takes effective treatment measures.

4、 Management of new or increased harmonic source users

1. The newly-built or increased capacity harmonic source users must have harmonic review items in the design review of installation and power connection, and control measures shall be taken for those harmonic values exceeding the standard.

2. Users of newly-built or increased capacity harmonic source must have harmonic test report of monitoring station during project handover acceptance test. If the monitoring results exceed the standard, it is not allowed to connect to the network.

5、 Management of capacitor bank

1. When designing the capacitor bank, the design department should calculate the possibility of harmonic resonance and amplification according to the grid parameters of the connection point. If necessary, the detailed calculation should be carried out by measuring the background harmonic voltage and harmonic impedance.

2. During the construction acceptance of large compensation (or filtering) capacitor bank installed by power grid or users, harmonic test items shall be provided. When the capacitor is put into operation, the measured harmonic voltage amplification rate shall not be greater than 1.5 times. Otherwise, it can be put into operation after taking restrictive measures.

For more information, please pay attention to the website of Sichuan electric power harmonic detection company.

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