Description

80KV/100mA AC HIGH VOLTAGE TEST SET SERIES: AHVMTOC2 TYPE: 80K100m

APPLICATION:

“NTPL” make 80KV/100mA AC High Voltage Test Set is suitable for Power frequency applied voltage test on transformers, motors, insulators, VCB’s 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 0-80KV AC

 

TECHNICAL features:

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

Output                :                Continuously variable from zero to 80KV AC.

Capacity             :                100mA max. at HT side.

Duty                    :                Intermittent i.e. 5 minutes ON, 10 minutes. OFF.

• Output voltage variation: By means of motor driven arrangement.
• rate of Rise of output voltage: 2KV/sec.
• Over load tripping adjustment at any setting from 25mA, 50mA & 100mA.
• Over Voltage Indication & Interlock Protection provided.

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

1. Control & Measurement Unit.
2. HV Transformer Unit.

The Control & Measurement Unit will be provided with wheels for easy movement. High Voltage Transformer Unit will be mounted on trolley with wheels for easy movement.

CONTROL & MEASUREMENT UNIT:

• Power Mains ON – OFF MCB along with ‘MAINS ON’ lamp indication.
• ‘HT’ ON – OFF push button along with ‘HT ON’ lamp indication.
• Continuously variable autotransformer of suitable capacity to increase 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 output voltage when ‘decrease’ push is pressed ON.

METERING:

• Digital voltmeter generally connected to the LT side and scaled in KV. Resolution: 0.1 Accuracy + 1% of range.
• Digital milliammeter along with ‘PRESS TO READ mA’ push button to read the leakage current.
• A ‘TIMER’ will be provided to measure the duration of applied HV. A Buzzer will indicate the end of test and the voltage regulator will gradually & automatically decrease to reduce the voltage level to zero.

INTERLOCK & PROTECTION:

• 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 interlock can be by-passed by shorting corresponding terminals
• Besides 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 voltage and the increase mode circuit will not function further, even if ‘PRESS TO INCREASE’ push is pressed.

The whole control circuitry will be housed within a sheet metal cabinet properly powder coated.

HV TRANSFORMER UNIT:

HV Transformer used in the Test Set will be oil natural cooled indoor type and of suitable capacity. The HV winding of the High Voltage Transformer is of graded insulation; one end of the winding 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:

• Power Supply Cable with 3-pin plug- 5 meters -1 no.
• Interconnecting Cable between Control – Measurement Unit & HV Transformer-5 meters -1 Set
• Earthing Cable –Green- 10meters-1 no.
• Discharge Rod: In AC High Voltage testing, the device under test is normally discharged through transformer winding. However, for device under test having large capacitance a discharge rod may be used and hence it is provided with the set.

 

DOCUMENTS:

Operation Manual, Works Test Report, and Warrantee Certificate will be supplied along with the set.

 

 

Approx. Dimension:
Control & Measurement Unit
Length=740mmXWidth=710mmXHeigth=1175mm

Transformer Unit
Length=700mmXWidth=700mmXHeigth=1000mm

Approx. Weight:
Control & Measurement Unit      : 90 Kgs
Transformer Unit                            :  218 Kgs