Transformer Calibrator

HTQA-C Transformer Calibrator

A device used to change the current

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Product Introduction

Current Transformer (CT for short thereafter) is very similar to general transformers. General transformers are used in the circuit to alter voltage, while CTs are used to alter current. And that’s why CT was called converter. Now, devices that transform direct current (DC for short thereafter) into alternating current (AC for short thereafter) are named converters. And devices that are used to alter the magnitude of the current are named CT.

So why must we alter the current? That’s because the needed current varies dramatically from a couple of Amperes (A for short thereafter) to thousands of A, according to the requirement. We would have to make a large number of ammeters and other eletrical instruments if we want to measure the currents directly. This brings a lot difficulty to the manufacturing. It’s also dangerous because some circuits or wires may be burdened with voltage up to 220kV. And it’s not permitted to measure the current directly.

However, with CT, we are able to change the various currents to a small range that is both safe and measurable. We can measure currents of all scales with electrical instruments of only one current gauge, for example, with 5A universal current.

Besides that, the structure of CT and transformer is very much alike, both with a pair of windings, one called primary winding and the other secondary winding. And both two windings are electrically insulated from each other. When the CT is working, the primary winding W is connected to the circuit and the secondary winding W is connected to the electrical instrument. Therefore, when measuring under high voltages, though the primary voltage is very high, the secondary voltage is pretty low. So the staff and the device are both safe.

Thus, besides its convenience of changing the various currents to a small range, it also provides good insulation to ensure the safety of operators and instruments.

The product names: Transformer Calibrator

Product parametersProduct Parameters

Technical parameters

Working Condition 5℃-40℃   Relative humidity: <80%(25℃)
Altitude: <2500m   Power Frequency: 50Hz±0.5Hz
Power Voltage: 220V±5V
Measuring Range In-phase component(%): 0.0001~200.0   Resolution: 0.0001
Orthogonal Component (min): 0.001~ 700.0   Resolution: 0.001
Impedance(Ω): 0.0001~20.0   Resolution: 0.0001
Admittance(ms): 0.0001~20.0   Resolution: 0.0001
Basic Error In-phase Component: ΔX=±(X×2%+Y×2%)±Dx   (with Class 1 to spare)
Orthogonal Component(with Class 1 to spare)
“X”,“Y”——Values Displayed
“Dx, Dy”——Quantified Error   Dx=2, Dy=5
Percentage: Class 1.5 (with Class 1 to spare)
Working Range

(1) Current: (1%-149%)In   (In =5A)

    (5%-149%)In   (In =1A)

(2) Voltage: (5%-149%)Un   (Un =100V,150V,100V/√3)

    (5%-200%)Un   (Un =100V/3)

Work Load (1) Current: TO to TX<0.12Ω   cosΦ=1.0
(2) Voltage: a to x<0.25VA   (100V)
Weight 5kg

1.The appearance of the product is subject to the actual product. Technical parameters and models are subject to change without prior notice.In case of misappropriation or copying, legal liability will be investigated.

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Product Certificate

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.

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