Norms of acceptance tests. Electrostatic precipitators

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Norms of acceptance tests. Electrostatic precipitators

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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1.8.29. 1. Measurement of the insulation resistance of the transformer windings of the power unit.

The insulation resistance of 380/220 V windings with circuits connected to them must be at least 1 MΩ.

The insulation resistance of high voltage windings should not be lower than 50 MΩ at a temperature of 25 ºС or should not be less than 70% of the value specified in the unit's passport.

2. Testing the insulation of 380/220 V circuits of the power supply unit.

The insulation test is carried out with a voltage of 2 kV at a frequency of 50 Hz for 1 min. Elements operating at a voltage of 60 V and below must be disconnected.

3. Measuring the insulation resistance of a high voltage cable.

Insulation resistance, measured with a megaohmmeter for a voltage of 2500 V, should not be less than 10 MΩ.

4. High voltage cable insulation test.

The test is carried out with a voltage of 75 kV DC for 30 minutes.

5. Testing of transformer oil.

Maximum allowable values of oil breakdown voltage: before filling - 40 kV, after - 35 kV. The oil must not contain traces of water.

6. Checking the health of the grounding of equipment elements.

The reliability of fastening the grounding conductors to the grounding conductor and the following items of equipment is checked: collecting electrodes, positive pole of the power unit, electrostatic precipitator housing, transformer and electric motor housings, switch base, panel and control cabinet frames, high voltage cable casings, manhole hatches, insulator box doors, cable boxes, insulator flanges and other metal structures according to the project.

7. Checking the resistance of grounding devices.

The resistance of the ground conductor should not exceed 4 ohms, and the resistance of the grounding conductors (between the ground loop and the piece of equipment to be grounded) should not exceed 0,1 ohms.

8. Removal of current-voltage characteristics.

The volt-ampere characteristics of the electrostatic precipitator (dependence of the corona current of the fields on the applied voltage) are taken in air and flue gas according to the instructions in Table. 1.8.26.

Table 1.8.26. Guidelines for characterization of electrostatic precipitators

Test object	The procedure for taking current-voltage characteristics	Requirements for test results
1. Every field in the air	The current-voltage characteristic is taken with a smooth increase in voltage at intervals of changing the current load of 5-10% of the nominal value to the pre-breakdown level. It is removed when the mechanisms for shaking the electrodes and smoke exhausters are included in continuous operation.	The breakdown voltage on the electrodes must be at least 40 kV at the rated corona current for 15 min.
2. All fields of electrostatic precipitator in the air	Also	The characteristics taken at the beginning and end of the 24 h test shall not differ from each other by more than 10%
3. All fields of flue gas electrostatic precipitator	The current-voltage characteristic is taken with a smooth increase in voltage to the pre-breakdown level (ascending branch) with intervals of current load change of 5-10% of the nominal value and with a smooth decrease in voltage (descending branch) with the same intervals of current load. It is removed at the rated steam load of the boiler and the mechanisms for shaking the electrodes included in continuous operation.	The characteristics taken at the beginning and end of the 72 h test shall not differ from each other by more than 10%

See other articles Section Rules for the installation of electrical installations (PUE).

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