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Measurement - Overhaul

Energomont Catalog

Transformer catalog

 

 

SPECIAL MEASUREMENTS

The device for testing relays SVERKER 780

Sverker 780 is used primarily for testing of protective relay equipment, but can also be used for different types of testing and calibrating. Sverker can be used to test all single phase relay equipment in which it is not required to change frequency.

Sverker 780 can also examine three-phase relay protection devices, examining each phase separately. In addition, many protective relay systems that require phase shift can be tested this device.

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Relay type:

  • Overcurrent relays
  • Overcurrent relays with inverse time characteristic
  • Undervoltage relays
  • Grounding relays
  • Directional overcurrent relays
  • Directional earth relays
  • Overvoltage relays
  • Directional voltage relays
  • Directed power relays
  • Power factor relays
  • Differential protection (Differential circuits)
  • Spacers protection devices (Stage by stage)
  • Overcurrent relays with the negative sequence
  • Motor overload protection
  • Devices for automatic switching
  • Trigger relays
  • Regulated voltage relays
  • Podimpendance relay (Z less than…)
  • Thermal relays
  • Relays with a time delay

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Other use:

  • Recording curvy initiatives
  • Testing transformation ratio of voltage and current
  • Measurement of the load of the relay protection devices
  • Impedance measurement
  • Tests of efficiency
  • Polarity test (Direction)

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ODEN AT/3X

Oden is intended for use in high voltage stations and industrial plants as well as for laboratory testing.
ODEN is primarily intended for:

  • Testing relay equipment (primary test)
  • Testing switch with overload trigger
  • Testing transmission ratio current of transformers
  • Testing transmission polarity of current of transformers

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ODEN AT / 3X may generate a large current and current to current of 4000A and 8000A for 3 seconds.

ODEN AT / 3X consists of a control unit equipped with a control panel and can be connected to one, two or three power units mounted on the device. All units are portable and can be easily connected.

The control unit controls the power output using the power units are equipped with sophisticated measuring equipment.

When a current is generated for the first time, the control unit can detect the phase angle and adjust the later generated electricity so that the current passes through zero which ensures minimum adjustment of switching when starting the measurement.

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Generating electricity:

Electricity can be generated in several ways, depending on the needs and the types of measurements:

  • Continuously
  • During the maximum preset time
  • As long as it is activated by the key operator
  • All until the stop of the activation of the input signal
  • At lower values of adjusted current (I / 30) to avoid unnecessary heating of the equipment under test
  • The pulses (pulse duration and pause between pulses is determined by the user)


ODEN AT / 3X at its output may generate a large current and continuous current to current of 4000A and 8000A for 3 seconds.

ODEN AT / 3X consists of a control unit equipped with a control panel and can be connected to one, two or three power units mounted on the device. All units are portable and can be easily mounted and connected.

The control unit controls the power output using the power units which are equipped with sophisticated measuring equipment.

When a current is generated for the first time, the control unit can detect the phase angle and adjust later generated electricity so that the current passes through zero which ensures minimum adjustment of switching when starting the measurement.

Measuring unit contains / provides:

  • Time counter (Timer)
  • Digital ammeter (True RMS)
  • Additional measuring channel for voltage or secondary current
  • Direct view of relations with current transformer
  • The provisions of the phase angle gauges Z, P, R, X, W, Q and the power factor (cosᵩ)
  • Expression of current and voltage (if desired) as a percentage of nominal value


In addition to the above there, there are a number of functions that provide a comfortable read, use the read values, archiving them in order to report measurement and data archiving.

Other fields of application are:

  • Testing is required when there are high currents
  • Measuring resistance switch to the normal operating current
  • Testing the direct operation of the automatic power disconnectors
  • Testing the VN head
  • Testing the ground network

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Data obtained during measurements can be transferred to a computer where they can be archived and printed.

Network analyzer CIRKUTOR ARL-5

The presence of a large number of nonlinear loads in distribution systems leads to a number of negative effects that can reflect on how the network itself and the other connected consumers. The common interest of consumers and producers of electricity in recent years has brought into focus the problems related to power quality, and harmonic content in the distribution network and other aspects of power quality (Continuity of power, the presence of short-term fluctuations and distortions, etc…).
Deterioration in the quality of electricity means the violation of the basic parameters of voltage in steady or transient waveforms and deformation. The basic parameters of voltage as its effective value, frequency, and phase symmetry of the voltage.
The term “network analyzer” refers to a special measuring instruments that are designed to measure various parameters of electrical networks. Generally to digital microprocessor instruments of the samples of voltage and current calculated effective values of voltage and current, active and reactive power, as well as more harmonious components of these sizes. Here is a network analyzer of the transmission type, which has its own memory and allows the serial line data to be transferred to a PC for further analysis.
Given that modern industrial plants active and reactive power change depending on the technology applied in the production process, it is necessary to establish measuring real change of active and reactive power and the presence of higher harmonics of voltage and current. The measurement should include all the characteristic cycle plants, which means that it is necessary that the measuring instrument has the possibility of storing measurement data over a period of several days or weeks. Instrument is a transmission type, and custom displays and stores key parameters single-phase or three-phase power supply. In addition, in the case of a three-phase, the network may not be balanced because the device has three completely separate measurement system. He is measuring and recording of all relevant parameters.

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Those are:

  • All three phase voltages
  • All three phase currents
  • Active power and energy (phase and three-phase)
  • Reactive power and energy (phase and three-phase)
  • Apparent power
  • Frequency
  • THD factors of current and voltage
  • The harmonic content of current and voltage (Up to 50th harmonic)
  • The waveforms of voltages and currents
  • Short-term leaps and voltage dips
  • Flickers

The following programs are available:

Program 1: Network Analyzer
This program is used for measurement, display and to store the basic parameters of the main electrical network (voltage, current, active and reactive power, energy and frequency; their maximum and minimum values one second values, and middle values for the programmed period of measurement).

Program 2: Harmonic Analyzer
This program covers all the basic measurement parameters, as in the previous program, and added to measure the quality of electricity (THD factor, higher harmonics and waveforms of voltage and current).

Program 3: The Analyzer of disorders
This program is stored in voltage disturbances, such as decay, jumps, peaks, noise and waveform distortion. The applied method of monitoring is based on an analysis of voltage waveform in all three phases. Any deviation from the set tolerance, triggers the system to store waveforms during voltage disturbances. Recorded data can be transferred to a PC for further analysis.

Program 4: Flicker Analyzer (Jitter)
This program analyzes all three phase voltages simultaneously, looking for a slow voltage fluctuations. The analysis is done according to IEC 868 standard, which is relevant to this area.

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The purpose of measuring the quality of electricity is to determine which of the parameters exceeds the permissible value.

The process of measuring and monitoring power quality is a time consuming process, a few days (usually one week), and up to one month on the grounds that the current measurement and current readings are not a reliable indicator of the parameters exceeded the permissible value. The reason why the measurements of take a lot of time is the fact that disturbances in the network have the property repeat over a certain period of time.

Eight channel LMG precision power analyzer 500

Voltages and currents can be measured in a wide dynamic range making it suitable for all professional measurements. The instrument has a characteristic that by using a well-selected filter suppresses the harmonics of high values in this way during the measurement is taken into account only the basic harmonics from the network which ensures its accuracy and reliability of measurement.

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This device is one of the most important elements in a test measuring station because it has high accuracy of the measured values at low power factor (lower than 0.1).

  • Precision: 0.03%
  • Voltage: 3V – 1000V
  • Power: 20mA – 32A
  • Frequency: DC – 10MHz
  • It measures voltage, current, power energy, power, power factor, energy …
  • 1 to 8 isolated measuring inputs with very low capacity in relation to the ground
  • 3M samples / s for measurement without interruption
  • Measurement of harmonics according to EN 61000-3-2 standard
  • Harmonics and interharmonics to 99
  • Analog and digital inputs and outputs
  • Storing data on a USB memory and PC
  • Graphical view of waveforms
  • Configurations for measurements on transformers and motors
  • Auto scaling current sensors compensated in phase and amplitude

The purpose of measuring the quality of electricity is to determine which of the parameters exceeds the permissible value.

The process of measuring and monitoring power quality is a time consuming process, a few days (usually one week), and up to one month on the grounds that the current measurement and current readings are not a reliable indicator of the parameters exceeded in the permissible value. The reason why the measurements time depends on the fact that disturbances in the network have repetitions over time.

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Since the measurement and monitoring of power quality takes a long time we have to have such instruments with characteristics that the instrument can store large amounts of data.

Eight channel precise power analyzer LMG 500

The winding analyzer Tettex 2293 is used when examining the power transformer:

Measurement of ohmic resistance of the windings
Measuring the transmission ratio
Detection loop
Demagnetization of the core
Transformer heating test

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Tettex 2293 can perform resistance measurements on all types of buildings, but is specifically designed to measure the resistance of high inductive facilities (transformer windings, the generator coils …)

Technical characteristics of the instrument in this measurement:

  • Maximum measuring current DC: 67A
  • Maximum charge voltage DC: 100V
  • Range: 0.1μΩ – 320kΩ
  • Precision:
  • 0.1μΩ – 320μΩ: 0.1% ± 0.5μΩ
  • 320μΩ – 32kΩ: 0.1%


Tettex 2293 in measuring the transformation ratio, measures the relationship of windings and voltage relationship. TR winding ratio is the ratio of the windings on the HV side / ratio of winding voltage side. VR is the voltage ratio of voltage at the interface side VN / NN-phase voltage at the site.

Technical characteristics of the instruments in this measurement:

Maximum supply current AC: 1Apeak = 700mArms
Maximum measuring voltage AC: 95Vpeak = 67Vrms
Range: 1.0 … 10000

Technical characteristics of the instrument in this measurement:

  • 1.0… 100: 0.05%
  • 100 … 2000: 0.1%
  • 2000 … 20000: 1%
  • 20000 … 100000: 5%


Phase (AC measurement) typical measuring accuracy at the highest voltage

  • 1.0… 500: ± 0.10°
  • 500 … 10000: ± 1.00°

Phase (Clock number) with the highest accuracy measuring voltage

  • 1.0 … 500 ± 0.05°

In addition to these measurements, the instrument has the function to see the warming which belongs to the type tests of new power transformers. The purpose of this test is to balance the upper oil temperature rise with total losses and the establishment of secondary windings temperature rise at rated current and the temperature increase in the upper oil as previously specified.

The aim is achieved in two main steps: first the upper oil temperature and average temperature rise of oil are achieved when the transformer is the subject of the test voltage that is measured, active power is equal to the total losses of the transformer. They record the temperature of the oil and the cooling medium, and the test continues until it reaches a stable oil temperature. When he reached the upper oil temperature, the test should immediately proceed with a reduced test current to the nominal current for the coil connected. These conditions are maintained at a certain time (normally 1 hour).

Following the first part of the procedure (heating), resistance measurement should be performed after the rapid separation of power. The middle temperature of two coils is determined from the change in resistance over time, known as a cooling curve.

When viewing warming of Tettex 2293, it has the following characteristics:

Built-in analysis of the measuring temperature: 6
The sensor probe: PT100 Class A (4 probes with magnetic glowing of two probes for measuring the temperature of oil)
Temperature measurement accuracy: -20°C … +150°C: ± (0.41°C + 0.2% TMeas)

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