DL/T 2042-2019Technical specification for HVDC thyristor level test equipment (English PDF)

4.1 Environmental conditions

4.1.1 Ambient conditions for normal work

The environmental conditions for the normal working of the equipment are.

a) Ambient temperature. -10°C~55°C;

b) Relative humidity. 5%~95%;

4.1.2 Other requirements of the use environment

The equipment use environment should meet the following requirements.

a) Vibration that exceeds the severity level 1 specified in GB/T 11287-2000 should not occur;

b) There is a reliable grounding point, and the grounding resistance should meet the requirements of 4.4 in GB/T 2887-2011.

4.2 Insulation requirements

4.2.1 Insulation resistance

When the device is subjected to insulation resistance test under standard atmospheric conditions, the following requirements shall be met.

a) The power input of the device is tested with a 500V insulation resistance meter against the metal shell, and the insulation resistance should not be less than 100Mohm.

b) The power input and voltage output of the device are tested with a 500V insulation resistance meter, and the insulation resistance should not be less than 100Mohm.

4.2.2 Medium strength

a) The power input of the device can withstand a DC test voltage of 3kV to the metal casing for 1 minute, and the leakage current is not more than 5mA Withstand voltage test without insulation breakdown or flashover.

b) The power output circuit of the device can withstand a DC test voltage of 10kV to the metal shell, which lasts for 1 minute, and the leakage current is not large in the 5mA withstand voltage test, there is no insulation breakdown or flashover.

4.2.3 Impulse voltage

a) The power input of the device should be able to withstand an impulse voltage with a standard lightning peak value of 5kV to the ground without insulation breakdown or flashover the phenomenon appears.

b) The voltage output circuit of the device should be able to withstand the impulse voltage of the standard lightning wave with a peak value of 10kV to the ground without insulation breakdown or the flashover phenomenon appears.

4.3 Mechanical requirements

4.3.1 Vibration (sinusoidal)

The device shall have the ability to withstand the vibration response and durability of the severity level 1 specified in 3.2.1 of GB/T 11287-2000.

4.3.2 Impact

The device shall have the ability to withstand the impact response and durability of the severity level 1 specified in 4.2.1 of GB/T 14537-1993.

4.3.3 Collision

The device should have the ability to withstand the impact of the severity level 1 specified in 4.3 of GB/T 14537-1993.

4.4 The influence of power supply the working power supply of the device should be able to work reliably when the power supply voltage range of AC220 (-15%~10%) V is changed. Performance parameters Meet the requirements of this standard.

4.5 Structure and appearance requirements

4.5.1 Chassis and plug-in dimensions

The size of the chassis and plug-in unit of the device should meet the requirements of GB/T 7268 and GB/T 19520.12.

4.5.2 Surface coating

The color coated on the surface of the device should be uniform, without obvious color difference and glare, and the surface should be free of defects such as sand particles, wrinkles and flow marks.

4.5.3 Plug-in performance

The plug-in unit in the device should have a locking mechanism, which is flexible in insertion and removal and good interchangeability.

4.6 Safety requirements

4.6.1 General safety requirements

The general safety requirements are as follows.

a) The device should have an obvious grounding mark, and reliable grounding should be ensured during use. The device should not endanger the tester and the tested Safety of equipment.

b) The safety requirements of the device do not involve functional characteristics. The safety-related design and application of the components used in the device shall comply with the requirements of 8.3 in GB/T 14598.27-2008.

c) Starting from the device design, including component selection and layout, wire size and connection, structural layout, grounding, shape structure, to the determination of manufacturing, installation and marking, full consideration should be given to making the device stand by under normal working conditions and single fault conditions.

Minimize the danger of fire and electric shock or harm to users.

d) The conductor and its cross-sectional area shall fully comply with the electrical, mechanical and climatic requirements of this standard.

e) The safety performance of the port connected to the communication network should meet the requirements of IEC 62151.

f) The device should have obvious display status such as sound or indicator light.

4.6.2 Enclosure protection (IP code)

The protection of each part of the device shell shall meet the requirements of IP21 level specified in GB/T 4208-2017.

4.6.3 Flammability and fire prevention

The flammability level of the insulating materials and components used in the device should comply with the provisions of GB/T 14598.27-2008 in 7.5.Device the fireproof enclosure should meet the requirements in 7.9 of GB/T 14598.27-2008.

4.6.4 Safety signs

The device should have safety signs, and the safety signs used should comply with the provisions of GB/T 14598.27-2008, 9.1.

5.1 Technical parameters

5.1.1 Power input

5.1.2 Device low voltage test technical parameters

Impedance measurement uncertainty. not more than 5%

5.1.3 Technical parameters of sine generator (if any)

a) Frequency range. 100Hz~150kHZ

b) Frequency accuracy. ±2% (fixed value)

c) Maximum peak voltage. 10V

d) Maximum peak current. 100mA

5.1.4 Technical parameters of device high-voltage test

a) Output voltage range.

1) Forward protection trigger test. DC 5 kV ~10kV

2) Protection trigger test during recovery period. DC 300 V ~2500V

3) Reverse withstand voltage test. DC 5 kV ~10kV

b) Measurement uncertainty. not more than 3%

5.2 Performance requirements

5.2.1 Mechanical properties

The mechanical performance requirements are as follows.

a) The device should be designed to be portable or mobile to facilitate the use of the converter station on site.

b) The design of the device structure should fully consider the heat dissipation requirements.

c) The device should be connected to the thyristor stage through a special test handle, which is compatible with the structure of the corresponding converter valve.

5.2.2 Trigger test test mode

Trigger test test modes include.

a) In-situ test mode. it has the in-situ test function during trigger test, that is, the device can provide the trigger monitoring unit at the thyristor level the optical interface of the element board is connected, and the trigger pulse is issued by the device during the test, and the test voltage is applied to both ends of the thyristor-level cathode and anode.

The control thyristor stage is turned on normally.

b) Remote test mode. It has the remote test function during trigger test, which can pass the external test when the DC control host is offline.

Add a control signal to enable the valve control device to issue a trigger pulse, or the DC control host enters the test state to control the valve control to issue a trigger Pulse, the device applies a test voltage across the anode and cathode of the thyristor level to control the normal conduction of the thyristor level to meet the requirements of non-unplugging Requirement for testing of converter valve optical fiber.

5.2.3 Operation mode

The device has three operation modes. single test, full sequence automatic test and customized sequence test, and can realize three operation modes Free switching.

5.2.4 Parameter modification

The device shall have the functions of parameter modification and authority management.

5.2.5 Measuring points

The device shall provide ports for monitoring the current and voltage waveforms output by the measuring device.

5.2.6 Interlock function design

The device should have an interlock function. When only two switches are turned on at the same time, the test equipment works; otherwise, the equipment does not perform the test function.

No test voltage output.

5.2.7 Interface requirements

The device interface requirements are as follows.

a) Background monitoring interface. all parameters of the device can be passed through the communication port (RS232, RS485, USB, Bluetooth, wifi, etc.) to be transmitted or read.

b) Test signal output interface. a connecting device with locking device and protection function.

c) Optical fiber interface. there should be optical fiber connectors such as ST, FC, etc. that match the thyristor-level control equipment.

5.2.8 Test handle

The test requirements of relevant converter valve components of different structures shall be met.

6.1 Test function

The device should have at least the test functions listed in Table 1.

6.2 Test function requirements

6.2.1 Short circuit test

Test whether the thyristor stage is short-circuited. Apply power frequency voltage to the thyristor level, test the thyristor according to the thyristor level voltage and current Whether the tube level is short-circuited.

6.2.2 Impedance test

Test the impedance of the thyristor-level damping loop by applying different frequency AC sinusoidal currents corresponding to each component to the thyristor level.

To test whether the resistance value and capacitance value of the damping circuit meet the design requirements.

6.2.3 Trigger test

Verify the function of the thyristor-level trigger loop. Apply power frequency AC sinusoidal current that meets the design requirements of energy extraction at both ends of the thyristor stage Voltage, apply a trigger command synchronized to a certain trigger angle of the test voltage to the gate plate, and simultaneously monitor the voltage and current waveforms and determine the current peak value Whether the thyristor stage reaches the normal trigger state.

6.2.4 Forward protection trigger test

Test the trigger function of the thyristor-level forward protection. Apply enough positive polarity to the test product to make the gate plate forward protection action by detecting the voltage and current of the thyristor level, it should be possible to accurately determine whether the thyristor level is triggered. The voltage applied in the test is generally greater than the crystal the design value of thyristor-level overvoltage protection is less than the highest forward withstand voltage of thyristor-level, and the voltage peak value is adjustable.

6.2.5 Protection trigger test during recovery period

Test the trigger function of thyristor-level reverse recovery protection. The device can detect the turn-off time of the thyristor level and can recover in the reverse direction.

During the recovery period, apply a positive impulse voltage to the test product to check the protection trigger function of the gate plate during the reverse recovery period. Recovery period protection trigger test Generally include the low-voltage protection trigger test during the recovery period and the high-voltage protection trigger test during the recovery period.

6.2.6 Reverse blocking test

Test the thyristor-level reverse blocking capability. The test equipment should be able to accurately judge the crystal by detecting the thyristor-level voltage and current.

Whether the thyristor level withstands reverse voltage.

6.2.7 Generate test report

The test device has the function of automatically generating test reports. The test report should include the test date, test items, and test thyristors Level number, test result, "pass" or "unqualified" judgment, etc.

6.3 Test principle diagram

The schematic diagram of the test principle is shown in Figure 2.

Figure 2 Test principle diagram

7.1 Factory inspection

Before each set of test equipment leaves the factory, the technical inspection department of the manufacturer must conduct a comprehensive visual inspection and technical guidance of the equipment.

For standard and technical performance inspection, the inspection items are in accordance with Table 2.

7.2 Periodic inspection

The test device should be inspected regularly or sent for inspection when necessary. The inspection items are as specified in Table 2.

8.1 Packaging

8.1.1 The product should have inner and outer packaging, and have measures such as dustproof, rainproof, waterproof, room damp, shockproof, and anti-static.

8.1.2 The outer packaging box of the product shall be marked with a paint that is not easy to wash or fall off as follows.

a) The name of the shipping company, product name, and model;

b) The name, address and destination of the receiving unit;

c) Overall dimensions of the packing box (length x width x height) and gross weight;

d) The outside of the packing box should be marked with signs such as "moisture-proof", "upward", and "handle with care".

8.1.3 The package should be accompanied by the necessary software, manual, inspection report, accessories, packing list and product inspection certificate.

8.2 Transportation

Products should be suitable for land, air, and water (sea) transportation. The transportation and loading and unloading must be strictly in accordance with the regulations on the packaging box and GB/T Relevant regulations in 9174-2008.The storage temperature of the packaged product during transportation is -40°C~55°C, and the relative humidity is not more than 95%.

8.3 Storage

The packaged test device should be stored in a warehouse with an ambient temperature of -40 °C ~ 55 °C and a humidity of not more than 95%.

Alkali, salt and corrosive and explosive gases are protected from dust, rain and snow. Products that are not used for a long time should be kept in their original packaging.

10.1 Supporting documents with the product

The following documents should be attached to the factory products.

a) Quality certification documents, with factory inspection records;

b) Product specification;

c) Product schematic diagram and wiring diagram (can be included in the product manual);

d) Packing list.

10.2 Accessories supplied with the product

The accessory parts supplied with the product should be indicated in the relevant documents and should include.

a) Vulnerable parts and components;

b) Product accessories;

c) The spare parts and spare parts specified in the contract.