K540-4PS

K540-4PS meter

K540-4PS three-phase meter

The purpose of the "K540-4PS" set is to perform electromagnetic tests of transformers of all circuits and connection groups.

The set consists of 2 devices K540-4P and K540-4S meters that can be used both jointly and separately, in accordance with their functional purpose.

K540-4P Power transformer parameter meter performs the following functions -

1) Measurement of current and no-load losses at low and nominal excitation voltages of transformers (automatic switching excitation circuits for measuring no-load losses at low excitation voltage only available for transformers zero and eleventh groups of winding connections. For other groups connection of the windings, these measurements must be carried out with switching of transformer windings);

2) Measurement of current and losses of short-circuit;

3) Measurement of the transformation ratio;

4) Determination of the group of connection of windings for three-phase and single-phase transformers;

4) Measurement of DC resistance of transformer windings to current.

During the measurement, the asymmetry, the unsinusoidality and the excitation voltage frequency are controlled.

K 540-4S Meter of windings resistance of power transformers is intended to measure active  electrical resistance to direct current of windings of power transformers in laboratory and field conditions.


FEATURES:
The following parameters are measured in the K540-4P device:
Three phase currents (Ia, Ib, Ic);
Linear and phase voltages of low and high voltage windings;
Input voltage frequency.

From these measured parameters, the device calculates the following values:
- no-load and short-circuit power losses of transformers;
- transformation ratio;
- voltage shift angle of high and low voltage windings.

The following devices are virtually located in the device:
- twelve voltmeters;
- three ammeters;
- three wattmeters;
- frequency counter;
- three meters for the angle of shear stress.

This allows one device to carry out the necessary set of measurements for a transformer.

Wi-Fi control:
The devices are controlled using a smartphone, tablet or laptop with installed software (included in the package on a USB-flash drive). Communication is via Wi-Fi.
Measured and calculated values ​​are displayed on a Wi-Fi connected computer, tablet or smartphone.
The acquired measurement data can be saved in EXCEL file.
K540-4S milliohmmeter provides the ability to work with the built-in display and controls on the instrument panel.


Technical specification

Output parameters of the internal voltage source

1. Transformation ratio measurement mode and determination of the connection group in three-phase mode

1a. Output voltage adjustment range  -  0-30V

1b The highest value of the output current  -  1.0A

1c The difference between the highest and the lowest line voltages  -  0.5% max

2 Mode of measurement of no-load losses at low voltage

2a Output voltage adjustment range  -  0-380V

2b Maximum value of the output curren 0.3A


Parameters of a three-phase voltage and current meter at rated excitation voltage

1 Range of measurement of AC current  -  0.01-10.0 A

2 Limit of the permissible absolute basic error in measuring alternating current  -  0.002 x Ix + 1 dig. max A

3 AC voltage measurement range:

3a phase alternating voltage  -  1-400 V

3b linear alternating voltage  - 1-600 V

4 Limit of permissible absolute basic error in measuring alternating voltage, not more, V 0.002 · Ux + 1 dig.

5 Measurement range of active power, without using a current and / or voltage transformer -  0.1-4000 W

6 Limit of the basic absolute error of active power measurements, W 0.005 · Ux · Ix + 1 dig.


Voltage and current meter parameters at low excitation voltage from an internal source

1. Range of measurement of AC current  -  0.01-0.3 A

2. Limit of the permissible absolute basic error in measuring alternating current, no more, A 0.002 ∙ Ix + 1 dig.

3. AC voltage measurement range:

3a. phase alternating voltage  -  1-400 V

3b. linear alternating voltage  -  1-600 V

4 Limit of permissible absolute basic error in measuring alternating voltage, no more, V 0.002 · Ux + 1 dig.

5 Range of measurements of active power, 0.1-100 W

6 Limit of the basic absolute error of active power measurements, W 0.005 · Ux · Ix + 1 dig.


Parameters of the voltage and current meter at low excitation voltage from an external source

1. Range of measurement of AC current, A from 0.01 to 2

2. The limit of the permissible absolute basic error in measuring alternating current, A, no more than 0.002 ∙ Ix + 1 dig.

3. AC voltage measurement range:

3a. phase alternating voltage, V from 1 to 400

3b. linear alternating voltage, V from 1 to 600

4 Limit of permissible absolute basic error in measuring alternating voltage, no more, V 0.002 · Ux + 1 dig.

5 Range of measurements of active power, W from 0.1 to 700

6 Limit of the basic absolute error of active power measurements, W 0.005 · Ux · Ix + 1 dig.


Parameters of a three-phase voltage meter when determining the transformation ratio and connection group

1. AC voltage measurement range:

1a. phase alternating voltage, V from 1 to 400

1b. linear alternating voltage, V from 1 to 600

2. Limit of permissible absolute basic error in measuring alternating voltage, no more, V 0.002 · Ux + 1 unit

3. Input resistance, not less, kOhm 600

4. Range of measuring AC voltage from an internal source:

4a. phase alternating voltage, V from 1 to 30

4b. linear alternating voltage, V from 1 to 30

5. Limit of permissible absolute basic error in measuring alternating voltage, no more, V 0.002 · Ux + 1 unit


Notes:

IX is the measured value of the current strength, A;

UX - measured voltage value, V;

e.m.r. - unit of the least significant digit.


Basic technical data of the K540-4S meter

1 Range of resistance measurement,  From 0.0010 to 2000 Ohm

2 Maximum voltage value, V 48 ± 2

3 Limit of permissible absolute basic error of resistance measurement, Ohm no more than 0.002 · Rx + 1 dig.

4 Maximum current through the winding, A 1.0 ± 0.1


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