Description

“NTPL” MAKE 100 KV /100mA AC HIGH VOLTAGE Test Set SERIES : AHVMTOC2 TYPE : 100K100m

APPLICATION:

“NTPL” make AC High Voltage Test Set is suitable for Power frequency applied voltage test on transformers, motors, insulators etc. for which the test parameters are within the technical scope of output of the test set. The set is capable of giving continuously variable High Voltage from 0 to 100KV AC.

 

 

 

 

 

Technical Features:

Input         : 230 Volts, single phase, 50Hz, AC.

Output      : Continuously variable from 0 to 100KV.

Capacity    : 100mA max. at HT side.

Duty          : The Test Set will be designed for Intermittent rating,

as per requirement of test intervals.

Nature of Cooling: The Transformer will be type.

Output voltage variation: By means of motor driven arrangement.

Approx. rate of rise of output voltage 2KV/sec.

Over load Tripping adjustment: At 25mA, 50mA & 100mA AC.

Over Voltage Indication & Interlock Protection provided.

The above test kit will be in 2 units i.e.

1. Control & Measurement Unit.
2. AC HV Transformer Unit. Power Mains ON – OFF operation is done by means of an ON – OFF switch along with ‘MAINS ON’ lamp indication & Fuse.

All the above units will be provided with wheels for easy movement.

 

Control & Measurement Unit :

• Power Mains ON – OFF operation is done by means of ON-OFF switch & Fuse/ MCB.
• Control ON-OFF switch along with fuse protection
• HT ON’ push button & ‘EMERGENCY OFF’ mushroom type push button
• Continuously variable autotransformer of suitable capacity to increase/decrease the output test voltage up to the required voltage level.
• INCREASE/DECREASE circuit to control motor operated Voltage Regulator. When high voltage circuit is energised the regulator will rotate to increase the output voltage when INCREASE’ push is pressed ON or decrease the out put voltage when DECREASE’ push is pressed ON.
• LAMP INDICATIONS: ‘MAINS ON, ‘HT ON’, ‘CONTROL ON’,’REG. NOT AT ZERO’,’OVERVOLTAGE’

Metering :

• Digital Voltmeter generally connected to the tertiary winding of HV Transformer and scaled in KV. Resolution: 0.1KV. If Capacitive Potential Divider is used then the Digital Voltmeter will be connected to the low voltage arm of the HV Capacitive Potential Divider. Resolution: 0.1KV.
• Digital milliammeter along with ‘PRESS TO READ mA’ push button to read the leakage current. Resolution : 0.1Ma
• A ‘TIMER’ will be provided to count down the duration of applied HV. After completion of the test time the regulator will automatically decrease to zero position. ‘RESET’ feature of the ‘TIMER’ will be provided.

Interlock :

• Zero start interlocking will be provided to ensure that the HV circuit cannot be energised unless the regulator is initially kept or brought back to zero position.
• Minimum & maximum position interlock will be provided so that limit switch will automatically disconnect ‘INCREASE/DECREASE’ circuit of motor connection at maximum and minimum position respectively.
• Enclosure interlocking will be provided i.e. high voltage circuit cannot be energised unless the door of the enclosure is closed. However, this inter lock can be by-passed by shorting corresponding terminals.

Protection :

• Besides main switch & fuse in the input side/MCB, one CT and contactor provides a snap acting automatic tripping of HV circuit in case of over load.
• The tripping mechanism can be adjusted at different values as mentioned above. After tripping, High Voltage will be switched OFF
• In case the voltage exceeds the maximum rated value a lamp & buzzer will indicate over vo and the increase mode circuit will not function further, even if ‘PRESS TO INCREASE’ push is pressed.

 

HV Transformer :

• HV Transformer used in the test set will be oil natural cooled indoor type and of suitable capacity.
• The HV winding of the Transformer is of graded insulation; one end being connected to the earth potential through a CT operated milliammeter & tripping device, while the other end remains in floating condition as HT Terminal.
• The transformer will be designed to withstand frequent intermittent spark over or short circuit conditions under which such testing transformers are designed to operate.
• HT terminal will be provided with anti-corona metallic ring of adequate diameter to facilitate uniform charge distribution.
• The HV Transformer will be mounted on MS trolley within insulated jacket.

Accessories :

The set will be provided with ………….

1. Power Cable of minimum 5m long – 1 No.
2. Power Interconnector Cable of minimum 5m long- 1 No.

III. Discharge rod with 5M long lead (grounding cable) with clamp- 1 No.

Optional at Extra Cost :

Potential Divider :

This is well known that for high capacitive loading the HV output may be more than the expected voltage i.e. voltage ratio of the transformer. Hence, HV measurement is very vital in this high capacity

AC HV Test set. There will be a capacitive HV Potential Divider provided with low voltage arm.

A UHF connector with co axial cable is used to connect a metering circuit (provided in the panel) to indicate

High Voltage.

Rated max working voltage – 100KV AC rms.

The capacitor will be oil-cooled type, provided with corona guard and will be movable with wheels at bottom.

Documents :

The following documents will be provided along with the test set.

• Operation Manual.
• Works Test Report with traceability.
• Warrantee Certificate.

Approx. Dimension :

Control & Measurement Unit :   L=838mmXW=470mmXH=495 mm
HV Transformer :   L=584mmXW=533mmXH=890mm
Capacitive Potential Divider :   L=910mmXW=910mmXH=1230mm

Approx. Weight :

Control & Measurement Unit: 42Kg.
HV Transformer: 222Kg.
Capacitive Potential Divider: 25kg