This system is designed and manufactured for the communication withstand voltage test of 11kV/30MW hydro-generator
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| Rated voltage U0/U(kV) | Test voltage time | Time(min) |
| 18/30 and below | 2U0 | 15(or 60) |
| 21/35-64/110 | 2U0 | 60 |
| 127/220 | 1.7U0(or 1.4U0) | 60 |
| 190/330 | 1.7U0(or 1.3U0) | 60 |
| 290/500 | 1.7U0(or 1.1U0) | 60 |
| Rated voltage U0/U(kV) | Test voltage | Time(min) | |
| New operational lines or non new operational lines not exceeding 3 years old | Non new operational routes | ||
| 48/66 | 2u | 1.6U | 60 |
| 64/110 | |||
| 127/220 | 1.7U | 1.36U | |
| 190/330 | |||
| 290/550 | |||
| System nominal voltagekV | The highest voltage of the equipment is kV | AC withstand voltage kV | |
| Oil immersed power transformer | Dry-type power transformers | ||
| <1 | ≤1.1 | —— | 2 |
| 3 | 3.6 | 14 | 8 |
| 6 | 7.2 | 20 | 16 |
| 10 | 12 | 28 | 28 |
| 15 | 17.5 | 36 | 30 |
| 20 | 24 | 44 | 40 |
| 35 | 40.5 | 68 | 56 |
| 66 | 72.5 | 112 | —— |
| 110 | 126 | 160 | —— |
| System nominal voltage | Maximum voltage of equipment | Neutral point grounding method | Factory AC withstand voltage | Handover communication withstand voltage |
| 66 | -- | -- | -- | -- |
| 110 | 126 | not directly grounded | 95 | 76 |
| 220 | 252 | directly grounded | 85 | 68 |
| not directly grounded | 200 | 160 | ||
| 330 | 363 | directly grounded | 85 | 68 |
| not directly grounded | 230 | 184 | ||
| 500 | 550 | directly grounded | 85 | 68 |
| Grounding through a small resistor | 140 | 112 | ||
| 750 | 800 | directly grounded | 150 | 120 |
| Rated voltagekV | Maximum working voltage kV | Terminal AC test voltage value kV | Neutral point AC test voltage value kV | ||
| Replace all windings | Partial replacement of windings or handover | Replace all windings | Partial replacement of windings or handover | ||
| <1 | ≤1 | 3 | 2.5 | 3 | 2.5 |
| 3 | 3.5 | 18 | 15 | 18 | 15 |
| 6 | 6.9 | 25 | 21 | 25 | 21 |
| 10 | 11.5 | 35 | 30 | 35 | 30 |
| 15 | 17.5 | 45 | 38 | 45 | 38 |
| 20 | 23.0 | 55 | 47 | 55 | 47 |
| 35 | 40.5 | 85 | 72 | 85 | 72 |
| 66 | 72.5 | 140 | 120 | 140 | 120 |
| 110 | 126.0 | 200 | 170（195） | 95 | 80 |
| 220 | 252.0 | 360 | 306 | 85 | 72 |
| 395 | 336 | （200） | （170） | ||
| 330 | 363.0 | 460 | 391 | 85 | 72 |
| 510 | 434 | 230 | 195 | ||
| 500 | 550.0 | 630 | 536 | 85 | 72 |
| 680 | 578 | 140 | 120 | ||
| Capacity(kW) | Rated voltage(V) | Test voltage(V) |
| Below 10000 | 36 or above | (1000+2Un)*0.8,The minimum is 1200 |
| 10000 and above | Below 24000 | (1000+2Un)*0.8 |
| 10000 and above | 24000 and above | Negotiate with the manufacturer |
| AC voltage withstand test of stator winding |
1) Before major overhaul 2)After replacing the winding |
1)The test voltage after replacing all stator windings and repairing them is as follows: |
1)It should be carried out in a hot state before cleaning the dirt after shutdown. When in standby mode, it can be carried out in a cold state. The test conditions for hydrogen cooled generators are the same as those specified in Table No. 3 2)Water cooled motors should generally be tested with water flowing. Imported units should be tested according to the manufacturer's regulations, and the water quality requirements are the same as those specified in Table 3 (Note 5) 3)When conditions permit, ultra-low frequency (0.1Hz) withstand voltage can be used, with a peak test voltage of 1.2 times the peak power frequency test voltage 4)Please refer to relevant materials for the test voltage during the process of replacing all or part of the stator winding |
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|
capacity kW or kVA |
rated voltage Un V |
test voltage V |
|||
| Less than 10000 | 36 or above | 2 Un+1000, but the minimum is 1500 | |||
| 10000 and above | Below 6000 | 2.5Un | |||
| Below 6000 | 2 Un +3000 | ||||
| Above 18000 | According to a specific agreement | ||||
| 2)The test voltage before or after partial replacement of the stator winding and repair is: | |||||
| Operating for 20 years or less | 1.5Un | ||||
| Those who have been operating for more than 20 years and are directly connected to overhead power lines | 1.5Un | ||||
| Those who have been operating for more than 20 years without direct connection to overhead lines | (1.3~1.5) Un | ||||
1.The appearance of the product shall be subject to the actual product，Technical parameters with model if there are any changes，without notice.In case of misappropriation or copying, legal liability will be investigated.
2. For more information about Wuhan UHV, please enter product center . Service email：info@hvtest.cc
1、The required power capacity is greatly reduced. Series resonant power supply generates high voltage and high current through resonance between resonant reactor and the tested capacitor. In the entire system, the power supply only needs to provide the active consumption part of the system. Therefore, the required power supply for the experiment is only 1/Q of the test capacity.
2、The weight and volume of the equipment have been greatly reduced. In a series resonant power supply, not only is the bulky high-power voltage regulating device and ordinary high-power power frequency test transformer eliminated, but the resonant excitation power supply only requires 1/Q of the test capacity, greatly reducing the system weight and volume, usually 1/10-1/30 of ordinary test devices.
3、Improve the waveform of the output voltage. The resonant power supply is a resonant filtering circuit that can improve the waveform distortion of the output voltage, obtain a good sine waveform, and effectively prevent the accidental breakdown of the test sample by harmonic peaks.
4、Prevent large short-circuit currents from burning the fault point. In the series resonance state, when the weak point of the insulation of the test sample is broken down, the circuit immediately disengages and the loop current rapidly drops to 1/Q of the normal test current. However, when conducting voltage withstand tests in parallel resonance or test transformer mode, the breakdown current immediately increases by several tens of times. Compared with the two, the short-circuit current is hundreds of times different from the breakdown current. So, series resonance can effectively identify insulation weaknesses without the risk of large short-circuit currents burning the fault point.
5、There will be no overvoltage recovery. When the test sample breaks down, due to the loss of resonance conditions, the high voltage immediately disappears, the arc immediately extinguishes, and the process of re establishing the recovery voltage is long. It is easy to disconnect the power supply before reaching the flashover voltage again. This voltage recovery process is an intermittent oscillation process of energy accumulation, which is long and does not result in any recovery overvoltage.
Enterprise products in strict accordance with international and national standards and rules of industry production, through the national, provincial and municipal electric power research institute and electric power authorities detection, measuring center, fully passed the ISO9001 international quality management system certification, the licence for manufacturing measuring instruments of the People's Republic of China, GB/T19001-2016 quality management system requirements, GB/T24001-2016 environmental management system requirements, GB/T45001-2020 occupational health and safety management system requirements.
email： info@hvtest.cc
Skype： Tina Qiao
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