CHVT-500

Instrument Voltage Transducer

National Registry N 77712-20

The CHVT-500 is a high-voltage capacitive instrument transducer designed for testing instrument voltage transformers up to 500 kV.

The CHVT-500 is available in some configurations with respect to the accuracy class and rated secondary voltage.

Accuracy classes: 0.05, 0.1

Rated secondary voltages: 100/√3; 100; 100/3; 110/√3; 110; 110/3; 120 V

Purpose

The CHVT-500 transforms high AC voltage applied to its primary side into low AC voltage on its secondary side with a standard-compliant scaling factor.

Application

The CHVT-500 can be used:

	As a reference voltage device in the course of testing (calibration, verification) of instrument voltage transformers rated up to 500 kV and of 0.02 accuracy class (or less accurate)
	For high voltage measurements

Basic accuracy specifications

Parameter	Value
Primary (input) voltage rating (RMS, 50 Hz)	500/√3 kV
Secondary (output) voltage ratings	100/√3, 100, 100/3, 110/√3, 110, 110/3, 120 V
Range of primary voltage measurements (in % of rated voltage)	40 to 120 %
Limits of permissible voltage measurement error (for accuracy class 0.1):
Ratio error δКu	±0.1 %
Phase error Δφ	±5.0 min
Limits of permissible voltage measurement error (for accuracy class 0.05):
Ratio error δКu	±0.05 %
Phase error Δφ	±2.0 min
Test voltage (RMS, 50 Hz) applied to the CHVT-500 during 1 min (kV)	1.32•Unom + 15 kV, where Unom means “rated voltage”

Basic specifications

Mains supply

207 ... 253 V,
49.8 ... 50.2 Hz

Operating temperature range

+10 to +25 °C

Weight

UIN
2 kg, or less
PCU
140 kg, or less

Parameter	Value
Excessive pressure of SF₆ gas:
nominal	0.35 MPa
minimal	0.25 MPa
Capacitance of the HV Instrument Capacitor of the PCU	40 to 60 pF
UIN load resistance (no less than)	100 kOhm
UIN load capacitance (no more than)	5.0 nF
UIN power consumption (no more than)	10 VA
Time of continuous operation when powered from mains (no less than)	8 hours
Mean time to failure (no less than)	8000 hours