Delta Electronics Toroidal Current Transformers

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Summary

Introduction

The TCT series of precision toroidal current transformers provides sample voltages for RF current phase and magnitude measurement on broadcast antenna arrays. The transformers are available with center conductor voltage ratings of 10 kVRMS, 20 kVRMS or 42.4 kVRMS for use with low to high power antenna arrays and standard to high impedance antennas. The transformer may be combined with any of Delta’s standard TCA-N-EX or TCA-N-EXR single scale or TCA-N/N-EXR dual scale RF ammeters for precision RF current measurements.

Description

The TCT-N transformer is assembled in a rectangular aluminum enclosure with a 1.25″ diameter insulated clearance hole for the antenna conductor. This clearance enables operation with conductor voltages as high as 14 kV peak (10 kVRMS). Although conductor type, size and placement are generally not critical for the TCT-N transformer, a 0.38 to 0.5″ diameter tubular conductor centered in the clearance hole provides optimum voltage capability. The TCA-LS-8 and TCA-LS-11 line sections which increase the TCT-N voltage rating by approximately 50% are available as a factory installed option.
The TCT-N-HV transformer is assembled in an aluminum enclosure with a 3.38″ diameter clearance hole for the antenna conductor. This large clearance enables operation with conductor voltages as high as 28 kV peak (20 kVRMS). A 0.75 to 1.0″ diameter tubular conductor centered in the clearance hole provides maximum voltage capability. Corona rings which increase the TCT-N-HV voltage rating by approximately 5% are available as a factory installed option.

The TCT-N-XHV transformer is assembled in a rectangular aluminum enclosure with a 6.0″ diameter clearance hole for the antenna conductor. This large clearance enables operation with conductor voltages as high as 60 kV peak (42.4 kVRMS). A 2.0 to 2.25″ diameter tubular conductor centered in the clearance hole provides maximum voltage capability.

Several versions of the TCT transformer are available for different RF current sampling requirements. The TCT-1, TCT-1-HV and TCT-1-XHV transformers provide 0.5 VRMS across a 50 ohm external load for each Ampere of current flowing in the antenna conductor. These models are rated for currents up to 40 ARMS. The TCT-2, TCT-2-HV and TCT-2-XHV transformers provide a 0.25 VRMS/Ampere sample across a 50 ohm external load and are rated for currents up to 80 ARMS. The TCT-3 and TCT-3-HV transformers provide a 1.0 VRMS/Ampere sample across a 50 ohm external load and are rated for currents up to 20 ARMS. The TCT-4, TCT-4-HV and TCT-4-XHV transformers and the TCT-5, TCT-5-HV and TCT-5-XHV transformers are high output, unterminated units which are used only with the 5, 10, 5/10 and 10/20 Ampere TCA RF Ammeters. The TCT-6-HV and TCT-6-XHV transformers provide a 0.125 VRMS/Ampere sample across a 50 ohm external load and are rated for currents up to 160 ARMS.

Features

The TCT-1 and TCT-2 may be used in the same directional antenna system since they have identical phase and magnitude tracking characteristics. The TCT-3 transformer has different characteristics and should not be mixed with the other two models. The TCT-1-HV, TCT-2-HV and TCT-6-HV may be used in the same directional antenna system since they have identical phase and magnitude tracking characteristics. The TCT-3-HV transformer has different characteristics and should not be mixed with the other three models. All TCT-N-XHV transformers may be used in the same directional antenna system since they have identical phase and magnitude tracking characteristics. The TCT-N series of transformers should not be mixed with the TCT-N-HV or TCT-N-XHV transformers due to the differences in the toroid inductors used in each design. Similarly, the TCT-N-HV series of transformers and the TCT-N-XHV series of transformers should not be mixed with the other series of transformers due to the difference in the toroid inductors used in each design.

Technical Specification

Technical Specification

Model:

TCT-N

TCT-N-HV

TCT-N-XHV

Frequency Range: 0.5 to 2 MHz 0.5 to 2 MHz 0.5 to 2 MHz
Sensitivity*:
(Volts/Ampere)
TCT-1: 0.5
TCT-2: 0.25
TCT-3: 1.0
TCT-4: 1.0
TCT-5: 2.0
TCT-1-HV: 0.5
TCT-2-HV: 0.25
TCT-3-HV: 1.0
TCT-4-HV: 1.0
TCT-5-HV: 2.0
TCT-7-HV: 0.125
TCT-1-XHV: 0.5
TCT-2-XHV: 0.25TCT-4-XHV: 1.0
TCT-5-XHV: 2.0
TCT-6-XHV: 0.125
Source Impedance: 50 Ohms 50 Ohms 50 Ohms
Current Range:
(Amps)
TCT-1: 0 – 40
TCT-2: 0 – 80
TCT-3: 0 – 20
TCT-4: 0 – 20
TCT-5: 0 – 10
TCT-1-HV: 0 – 40
TCT-2-HV: 0 – 80
TCT-3-HV: 0 – 20
TCT-4-HV: 0 – 20
TCT-5-HV: 0 – 10
TCT-7-HV: 0 – 160
TCT-1-XHV: 0 – 40
TCT-2-XHV: 0 – 80TCT-4-XHV: 0 – 20
TCT-5-XHV: 0 – 10
TCT-6-XHV: 0 – 160
Absolute Magnitude Accuracy: ±2% ±2% ±2%
Absolute Phase Accuracy†: TCT-1 & TCT-2: ±2º
TCT-3: ±3º
TCT-1, -2 & -7-HV: ±2º
TCT-3-HV: ±3º
TCT-1, -2 & -6-XHV: ±2º
Magnitude Tracking Accuracy: ±1% ±1% ±1%
Phase Tracking Accuracy†: TCT-1 & TCT-2: ±0.5º
TCT-3: ±1º
TCT-1 & -2-HV: ±0.5º
TCT-3 & -7-HV: ±1º
TCT-1, -2 & -6-XHV: ±1º
Insulation: 14 kV peak (10 kVRMS)
Optional TCA-LS-8 or TCA-LS-11 line section increases voltage rating to 21 kV peak (15 kVRMS)
28 kV peak (20 kVRMS)
Optional corona rings (standard on TCT-7-HV) increase voltage rating 5%
60 kV peak (42.4 kVRMS)
Electric Field Rejection: >100 dB >100 dB >100 dB
Dimensions:
(W x H x D)
Inches
cm
5.25 x 5.75 x 2.25
13.3 x 14.6 x 5.7
6.25 x 7.25 x 2.25
15.9 x 18.4 x 4.7
12.75 x 12.00 x 3.00
32.4 x 30.5 x 7.6
Weight:
Pounds
kg
3.5
1.6
5.5
2.5
17
7.7
Order Numbers: 923-0001-00N
where  N = 1,2,3,4 or 5
923-0003-00N
where  N = 1,2,3,4, 5 or 7
923-0004-00N
where  N = 1,2,4,5 or 6
* When terminated in external 50 ohm load. Other sensitivities and corresponding RF Ammeter current ranges available on special order.
 The Model TCT-4, TCT-5, TCT-4-HV, TCT-5-HV, TCT-4-XHV and TCT-5-XHV toroidal current transformers are supplied only with the Model TCA-5, -10, -5/10, 5/20, 10/20, and 10/40 RF Ammeters and with the Model DTCA-10 and -20 Digital RF Ammeters and are not characterized for absolute phase accuracy and for phase tracking accuracy.

PLEASE SEE THE BROCHURE TAB FOR TECHNICAL DRAWINGS
For installation drawings please contact tech_support@innescorp.com.au or click here to visit the Delta Electronics website.

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