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Ultra low frequency insulation withstand voltage test is actually
an alternative method of power frequency withstand voltage test. We
know that when the power frequency voltage withstand test is
carried out on large generators, cables and other test objects,
because their insulation layer presents a large capacitance, a
large capacity test transformer or resonant transformer is
required. Such huge equipment is not only bulky and expensive, but
also inconvenient to use.
In order to solve this contradiction, the power department has
adopted reducing the test frequency, thereby reducing the capacity
of the test power supply.
Many years of theory and practice at home and abroad have proved
that using 0.1Hz ultra-low frequency voltage withstand test instead
of power frequency voltage withstand test can not only have the
same equivalence, but also greatly reduce the volume and weight of
the equipment.
The above picture is the complete configuration diagram of 80kV
50kV Test system show
| Models | Rated Voltage | Load Carrying Capacity | Product structure, weight, application range |
| XHDP-30 | 30kV (Peak) | Automatic frequency change:0.1Hz-0.01Hz On-load capacity:≦10µF | Controller: 4㎏ Booster: 25㎏ Used for voltage test of cables and motors within 10KV |
| XHDP-50 | 50kV (Peak) | Automatic change frequency: 0.1Hz-0.01Hz Load capacity: ≦6µF | Controller: 4㎏ Booster: 25㎏ Used for voltage test of cables and motors within 15KV |
| XHDP-60 | 60kV (Peak) | Automatic change frequency: 0.1Hz-0.01Hz Load capacity: ≦5µF | Controller: 4㎏ Booster: 25㎏ Used for voltage test of cables and motors within 25KV |
| XHDP-80 | 80kV (Peak) | Automatic change frequency: 0.1Hz-0.01Hz Carrying capacity: ≦6µF(within 50kV), ≦4µF(above 50kV) | Controller: 4㎏ Primary booster (40kV) : 25㎏ Two stage booster (40kV) : 45㎏ Used for voltage resistance test of cables and motors within 35KV |
FEATURES
This product adopts digital frequency conversion technology,
single-chip microcomputer control, voltage boost, buck,
measurement, protection completely automatic. Due to the full
electronic, so small size and light weight, the use of large screen
color touch display, clear and intuitive, simple operation, display
output waveform. The design index conforms to the national standard
of "General Technical Conditions of Ultra-low frequency high
voltage generator". The main features are as follows:
1. The ultra-low frequency with rated voltage less than or equal to
60kV adopts a single link structure (a booster); The ultra-low
frequency of more than 60kV adopts a series structure (two booster
in series), which greatly reduces the overall weight and enhances
the load capacity, and the two booster can be used separately to
achieve a multi-purpose machine.
2. Current and voltage data are sampled directly from the high
voltage side, so the data is accurate.
3. Intelligent comprehensive protection function: there is no need
to set the current and voltage protection value, the instrument can
calculate the overvoltage and overcurrent protection value
according to the size of the test capacity and the test voltage
value, and can also protect the voltage and current mutation, so it
can capture the discharge situation. The protection operation time
is less than 20ms.
4. 150kV high voltage line output, safe and reliable.
5. Because of the closed-loop negative feedback control circuit,
the output has no capacity rise effect.
TECHNICAL DESCRIPTION
| Output rated voltage | 30kV-80kV. The different specifications are shown in Table 1 |
| Output frequency | Automatic conversion range: 0.1Hz-0.01Hz |
| Carrying capacity | See Table 1 |
| AC voltage resolution | 0.1kV |
| Voltage accuracy | 3% |
| AC current resolution | 0.1mA |
| AC current accuracy | 3% |
| Voltage positive and negative peak error | ≤ 3% |
| Voltage waveform distortion | ≤ 3% |
| Conditions of use | indoor and outdoor; Temperature: -10℃∽+40℃; Humidity: ≤ 85%RH |
Input power: frequency 50Hz, voltage 220V±5%(or frequency 60Hz, voltage
110V±5%). If the micro generator is used for power supply, the
frequency conversion generator should be used, and the ordinary
generator can not be used, because the ordinary generator speed is
unstable, which will make the boost voltage abnormal and damage the
instrument.
MAIN STRUCTURE
- For the ultra-low frequency with a rated voltage below 60kV(include
60kV), a booster is used, which is called the single-coupled
ultra-low frequency, and its structure and components are described
in the following figure:
- For ultra-low frequency with rated voltage above 60kV, two boosters
are used in series, which is called series ultra-low frequency, and
its structure and components are described in the following figure:
CONNECTION METHOD
1.Below 60kV single-link ultra-low frequency voltage test
connection mode is as follows:
2.The connection method of ultra-low frequency voltage withstand
test when the two-stage booster is connected in series is as
follows:
