Detailed introduction
Use
The MP-EVT-10L Electronic
voltage transformers is suitable for use in outdoor and on-column vacuum
circuit breakers in power systems with a rated frequency of 50 Hz and a rated
voltage of 10 kV. The electronic sensor is used in conjunction with the
electronic meter and the computer measurement and protection equipment to
realize functions such as measurement, zero-sequence protection, data
transmission and digital detection of live status.
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pecifications:
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Conditions:
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Equipment maximum voltage: 12kV
Rated primary voltage: 10kV
Rated voltage ratio: 10000/√3V/6.5/3V
Accuracy level: 3P
Rated load: ≥1MΩ
Rated frequency: 50Hz
Rated insulation level: 12/42/75 kV
Partial discharge level: ≤20pC
Standards: GB/T20840.7-2007
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Temperature: -40°C~+70°C
Altitude: ≤2000m
Wind pressure and speed: ≤±700Pa; 34m/s;
Atmosphere: without heavy pollution
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Working principle and main features
The electronic voltage sensor works on the principle
that a voltage is divided by a capacitor to obtain a small voltage signal
proportional to the primary voltage.
Main feature:：
Direct output of small voltage signals simplifies system structure, reduces
error sources, and improves the stability and accuracy of the entire system;
It does not contain iron core, does not saturate, has wide frequency range,
large measuring range, good linearity and strong anti-interference ability. It
can make the protection device work reliably under system failure condition;
When the voltage output terminal is short-circuited, no overcurrent will occur,
nor ferromagnetic resonance will occur, which will eliminate the major troubles
in the power system and ensure the safety of personnel and equipment.
Moreover, it has small size, light weight, low energy consumption, and reduced
ferromagnetic pollution.
Installation
method
Fix the sensor to the flange with screws and connect the primary terminal to
the line;
The
bottom of the electronic sensor has a two-core shielded wire as a secondary
output terminal, which is connected to the electronic instrument or protection
device through a composite shielded cable. The cable shielding layer is
grounded through the sensor grounding insert or the metal base, and the
instrument or the protection device does not need to be grounded again; The
electronic
voltage sensor zero-sequence secondary output line is 1 (blue), 2 (brown); 1 is high
potential, 2 is ground.
Packaging
transportation and storage maintenance
The product is packed
in carton and has anti-shock and moisture-proof measures inside the box;
Visual inspection shall be carried out after unpacking, and the surface shall
be free from damage, deformation and cracks;
During
the life cycle of the product, no special maintenance is required, and it
should be handled gently and kept away from mildew and moisture.
Other information:
The
name, model number, main technical parameters and quantity of the product
should be provided when ordering.
Outline
drawing and installation dimensions: see the Figure below
Figure,
outline dimentions