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● Address: NO.208, Weiqi Road, Yueqing Economic Development Zone, YueQing, Zhejiang, China.

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CTKB-IV current transformer protector

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General introduction:


In power system, CT is widely applied in one time measurement and control of current. In normal working condition, the secondary side of CT is almost short circuit, and output voltage is very low. During operation, if the secondary winding is open circuit, or abnormal current flows the primary winding (such as lightning current,


CTKB-IV


resonance over current, capacitance charging current, inductive pickup current etc.) It will produce several thousands even several ten thousands voltage on the secondary side. This will not only damage the secondary system insulation, but also make CT burning owing to over voltage, even endanger the workman. But this CT can prevent such accident caused by the secondary open circuit of CT. The protector connects the two ends of secondary winding. The leakage current is very low on the normal working condition, and it's at the state of high resistance. When the abnormal over voltage occurs, the protector will act promptly and then short circuit. The panel will display the position of malfunction and the signal output of no power. When the malfunction is removed, pushing "reposition" button, the circuit will recover before, and then come into the normal condition.


CTKB-IV series CT overload protector is our own design and having got the patent, and up to the international advanced level. This product adopts the newly automatic control technology and high reliable components. Advanced design, long service life, over100,000 times of reliable action; fast action speed, strong overload ability ( exceed 5 times rated value in short time); low static current, it flows <5 µ A on normal working condition, which will not influence CT. And this product is featured in novel design, compact size, light weight, easy to carry.

Application:


CTKB-IV series CT overload protector is mainly applied in various CT secondary side abnormal over voltage protection, CT secondary side differential winding, over current winding, measurement winding, generatrix protection winding, spare winding etc.

Basic principal:

The basic apparatus of CT secondary open circuit over voltage protection is ZnO voltage dependent resistor, and parallel connection with secondary winding. In normal working condition, voltage dependent resistor is at the sate of high resistance, and the leakage current is very low, while the sample signal is "0'. The control circuit is off operation, and the CT is at the normal working condition. In general condition, secondary winding just has several voltage, and the max. voltage is less than 20V.

When CT is secondary return open circuit or primary winding comes forth abnormal over current, the voltage emerged from secondary winding is far higher than the normal condition voltage. Then the voltage dependent resistor is on state ( over 150V), the sample voltage signal is a little higher, and the inner automatic control circuit controls secondary winding short circuit, and active display on the panel. At the same time, it will output remote no power contact signal. When the malfunction is removed, it can operate. There're two reposition methods: one is the malfunction removing of power off, it automatically reposition when restarting the power; another is after the malfunction removing of power on, pushing "reposition" button, it'll remove the malfunction and the circuit will recover before.

Technical specification:

Model

CTKB-IV




Normal leakage current IL20V

<5 µ A

Forward voltage Uc

150V ± 10% (It can be set as per customers request.)

Forward time Ts

50ms = Ts = 250ms

Protection relay contact capacity

AC220V/10A

Remote relay contact capacity

AC220V/5A no power

CT specification

Secondary side peak value>150V

Reposition mode

Manual "reposition"; automatic "reposition"

Working environment

Temperature

- 20~70 ℃

Humidity

<95%RH

Withstand voltage

2KV 50Hz 1min

Quark-proof performance

10-50-10Hz 2g 3min

Anti-jamming

4.4KV/M

Connection mode

DIN-Rail/base/plug-in type


Appearance and weight

Refer to the graph

Reliability and safety

Confirmed to IEC834-1


General introduction:


In power system, CT is widely applied in one time measurement and control of current. In normal working condition, the secondary side of CT is almost short circuit, and output voltage is very low. During operation, if the secondary winding is open circuit, or abnormal current flows the primary winding (such as lightning current,


CTKB-IV


resonance over current, capacitance charging current, inductive pickup current etc.) It will produce several thousands even several ten thousands voltage on the secondary side. This will not only damage the secondary system insulation, but also make CT burning owing to over voltage, even endanger the workman. But this CT can prevent such accident caused by the secondary open circuit of CT. The protector connects the two ends of secondary winding. The leakage current is very low on the normal working condition, and it's at the state of high resistance. When the abnormal over voltage occurs, the protector will act promptly and then short circuit. The panel will display the position of malfunction and the signal output of no power. When the malfunction is removed, pushing "reposition" button, the circuit will recover before, and then come into the normal condition.


CTKB-IV series CT overload protector is our own design and having got the patent, and up to the international advanced level. This product adopts the newly automatic control technology and high reliable components. Advanced design, long service life, over100,000 times of reliable action; fast action speed, strong overload ability ( exceed 5 times rated value in short time); low static current, it flows <5 µ A on normal working condition, which will not influence CT. And this product is featured in novel design, compact size, light weight, easy to carry.

Application:


CTKB-IV series CT overload protector is mainly applied in various CT secondary side abnormal over voltage protection, CT secondary side differential winding, over current winding, measurement winding, generatrix protection winding, spare winding etc.

Basic principal:

The basic apparatus of CT secondary open circuit over voltage protection is ZnO voltage dependent resistor, and parallel connection with secondary winding. In normal working condition, voltage dependent resistor is at the sate of high resistance, and the leakage current is very low, while the sample signal is "0'. The control circuit is off operation, and the CT is at the normal working condition. In general condition, secondary winding just has several voltage, and the max. voltage is less than 20V.

When CT is secondary return open circuit or primary winding comes forth abnormal over current, the voltage emerged from secondary winding is far higher than the normal condition voltage. Then the voltage dependent resistor is on state ( over 150V), the sample voltage signal is a little higher, and the inner automatic control circuit controls secondary winding short circuit, and active display on the panel. At the same time, it will output remote no power contact signal. When the malfunction is removed, it can operate. There're two reposition methods: one is the malfunction removing of power off, it automatically reposition when restarting the power; another is after the malfunction removing of power on, pushing "reposition" button, it'll remove the malfunction and the circuit will recover before.

Technical specification:

Model

CTKB-IV




Normal leakage current IL20V

<5 µ A

Forward voltage Uc

150V ± 10% (It can be set as per customers request.)

Forward time Ts

50ms = Ts = 250ms

Protection relay contact capacity

AC220V/10A

Remote relay contact capacity

AC220V/5A no power

CT specification

Secondary side peak value>150V

Reposition mode

Manual "reposition"; automatic "reposition"

Working environment

Temperature

- 20~70 ℃

Humidity

<95%RH

Withstand voltage

2KV 50Hz 1min

Quark-proof performance

10-50-10Hz 2g 3min

Anti-jamming

4.4KV/M

Connection mode

DIN-Rail/base/plug-in type


Appearance and weight

Refer to the graph

Reliability and safety

Confirmed to IEC834-1