详细说明

高压电压有效值测量信号转换器 VariTrans® P 42000 TRMS KNICK

VariTrans® P 42000 TRMS AC/DC high-voltage transmitter for True RMS measurement Input signals from VIN = 10 V AC to VIN = 3600 V AC   Product description   Connection examples   Facts   Product Line   Dimension drawings   Schematic diagram   Specifications   Downloads

The Task In electrical installations AC voltages ranging up to 3600 V shall be monitored, galvanically isolated and converted to 0 to 20 mA, 4 to 20 mA or 0 to 10 V standard output signals. The DC output signal shall represent the root-mean-square-value (RMS) of the input voltage. The Problems The occurring AC voltages are not always sinusoidal, but sometimes distorted. Usual AC/DC transducers are designed only for sinusoidal sources and lead in case of non-sinusoidal signals to an error of the determined RMS value, which can be substantial or even make measurement worthless. Therefore, for non-sinusoidal distorted input signals a True RMS evaluation is necessary. In the case of insufficient insulation the high voltages and rough operating conditions may impair the galvanic isolation. This can result in false signals or even personal injury or damage to the equipment. These risks have to be securely eliminated in the long term through tranmitters that are specially suited for high-voltage applications. The Solution The Varitrans® P 42000 AC/DC high-voltage transmitter series has been specially conceived for measurements of AC voltages up to 3600 V. They reliably isolate high potentials at the input circuit. Through True RMS determination in the transformer also distorted input signals are correctly recorded and converted to so-called True Root Mean Square (T-RMS) output signals. The isolation unit is designed to permanently withstand potential differences up to 3600 V AC/DC and transient overvoltages up to 20 kV. Protection against dangerous currents is achieved through protective separation to EN 61140 from input to output and power supply. The Housing For the Varitrans® P 42000 D2/3 TRMS AC/DC high-voltage transmitters, a new 45 or 67.5 mm wide modular housing is used (depending on the input voltage level). It can be fixed on a standard DIN rail. The front panels of the adjustable models provide a rotary coding switch for selecting the ranges. The Advantages The Varitrans® P 42000 TRMS are available for any input voltage from 10 V AC to 3600 V AC. Analog standard signals are available at the output: 0...20 mA, 4 ... 20 mA or 0...10 V. The True RMS conversion is performed precisely up to a crest factor of 5. Most widely used nominal frequencies from 16.7 Hz to 1000 Hz are supported. 16 customer-specific input/output signal combinations can be chosen and conveniently selected using a rotary coding switch on the device front. Tedious adjustments using screwdriver, calibrator, and multimeter are not necessary. Drift problems due to instable trimming components (e.g. potentiometers) are avoided. Thanks to the easy range selection, the devices can be flexibly suited to the individual needs of the application. The integrated 20 to 253 V AC/DC broad-range power supply offers highest flexibility. It ensures problem-free operation with every AC or DC supply voltage utilized world-wide. Even instable power supply systems do not cause a problem. Installation is safe and easy: Erroneous connection of mains supply is practically impossible. Expensive standstill times and repair work during the commissioning are prevented. Vacuum encapsulation provides maximum long-term protection against aggressive environmental influences, shock and vibrations and ensures the high disruptive strength required for working voltages up to 3600 V AC/DC. The isolation unit meets the safety requirements of EN 61010-1. The Technology In this product line Knick utilizes the new TransShield® technology which enables the construction of very compact and low-leakage high-voltage transformers. Due to the resulting space savings a just 67.5 mm modular housing is sufficient for input voltages up to 3600 V AC (45 mm for input voltages up to 1200 V). Another significant advantage of this technology: high transient overvoltages (common-mode voltages) are safely isolated and are practically not causing any error at the output. Circuit design and device construction ensure excellent transmission characteristics, which become manifest in zero stability, linearity, long-term stability and immunity to interference.

Schematic diagram

Input Data
Input	P 42000 D2 TRMS-nnnn	10 V ... 1200 V AC; 1 to 16 customer-specific ranges, calibrated selection
	P 42000 D3 TRMS-nnnn	1200 V ... 2200 V AC; 1 to 16 customer-specific ranges, calibrated selection
	P 42100 D2 TRMS-nnnn	10 V ... 1200 V AC; range fixed to customer requirement
	P 42100 D3 TRMS-nnnn	1200 V ... 3600 V AC; range fixed to customer requirement
Rated frequency	50/60 Hz
Frequency range	40 … 1000 Hz (frequency ≤ 40 Hz on request)
Input resistance	Range 10 V ... 100 V AC	approx. 1 Mohm
	Range 100 V ... 500 V AC	approx. 3.6 Mohm
	Range 500 V ... 1200 V AC	approx. 7.2 Mohm
	Range 1200 V ... 3600 V AC	approx. 14 Mohm
Input capacitance	Approx. 1 nF
Overload	D2: 20 % full scale (max. crest factor 8), max. crest voltage ≤ 2000 V
	D3: 20 % full scale or < 3900 V AC (max. crest factor 8), max. crest voltage < 5500 V
Output Data
Output	P 42000 Dx TRMS-nnnn	0 … 20 mA, 4 ... 20 mA and/or 0 … 10 V to customer requirement, switchable
	P 42100 Dx TRMS-nnnn	0 … 20 mA, 4 ... 20 mA or 0 … 10 V fixed to customer requirement
Displacement	Up to 100 % as default
Load	With output current	≤ 12 V (600 ohms at 20 mA)
	With output voltage	≤ 10 mA (1000 ohms at 10 V)
Residual ripple	< 10 mVrms
Transmission Behavior
Gain error	< 0.5% full scale
	Gain error for sinusoidal input signals (crest factor √2) in the frequency range 45 … 65 Hz
Response T90	< 150 msec rising
	< 300 msec falling
Influential factors	Frequency 40 … 1000 Hz	< 1% meas.val. (typ. 0.5%)
(additional error)	Crest factor 1… 3 (non-sinusoidal signals)	< 0.5% meas.val.
	Crest factor < 3 … 5	< 1% meas.val.
Common mode rejection ratio	CMRR	DC: approx. 150 dB
	CMRR: Common-Mode Rejection Ratio =
	Differential voltage gain : Common-mode voltage gain
Temperature influence	< 100 ppm/K full scale
	Reference temperature for TC specifications = 23°C, average TC is specified
Power Supply
Power supply	20 ... 253 V AC/DC, AC 48 ... 62 Hz, approx. 2 VA; DC approx. 1.2 W
Isolation
Galvanic isolation	3-port isolation between input, output, and power supply
Test voltage	Calibrated selection	10 kV AC input against output and power supply
	Fixed settings (Model P 42100 Dx TRMS-nnnn)	15 kV AC input against output and power supply
	All models	4 kV AC output against power supply
Working voltage (basic insulation) to EN 61010-1	Calibrated switching	Up to 2200 V AC/DC across input, output, and power supply with overvoltage category III and pollution degree 2 (fast transients: 13.5 kV)
	Fixed settings (Model P 42100 Dx TRMS-nnnn)	Up to 3600 V AC/DC across input, output, and power supply with overvoltage category III and pollution degree 2 (fast transients: 20 kV)
Rated isolation voltage to EN 50124-1	Calibrated switching	Up to 2200 V AC/DC across input, output, and power supply with overvoltage category III and pollution degree 2
	Fixed settings (Model P 42100 Dx TRMS-nnnn)	Up to 3600 V AC/DC across input, output, and power supply with overvoltage category III and pollution degree 2
Protection against electric shock	Calibrated switching	Safe Isolation to EN 61140 by reinforced insulation according to EN 61010-1.
		Working voltages with overvoltage category III and pollution degree 2:
		– Up to 1100 V AC/DC across input, output, and power supply
		– Up to 300 V AC/DC across output and power supply
	Fixed settings (Model P 42100 Dx TRMS-nnnn)	Safe Isolation to EN 61140 by reinforced insulation according to EN 61010-1.
		Working voltages with overvoltage category III and pollution degree 2:
		– Up to 1800 V AC/DC across input, output, and power supply
		– Up to 300 V AC/DC across output and power supply
	For applications with high working voltages, you should ensure there is sufficient spacing or isolation from neighboring devices and protection against electric shocks.
Standards and Approvals
EMC	Product family standard	EN 61326
	Emitted interference	Class B
	Immunity to interference	Industry
	Slight deviations are possible while there is interference
Other Data
Ambient temperature	Operation	-10 ... +70 °C
	Operation with restricted data (on request)	-40 ... +85 °C
	Transport and storage	-40 ... +85 °C
Design	Modular housing	Housing width D2
	With screw terminals	Housing width D3
		See dimension drawings for further measurements
Ingress protection	IP 40 enclosure, IP 20 terminals
Fastening	With snap-on mounting for 35 mm top-hat rail according to EN 60715
Weight	Type D2 approx. 350 g, type D3 approx. 500 g

 

	Connection examples

The Facts
Universal usability:
	– AC input 60 mV~ to 3600 V~ and 100 mA~ to 5 A~
	– DC output 0 (4) ... 20 mA, 0 ... 10 V
New TransShield® technology enables extremely compact modular housings Working voltages up to 3600 V AC/DC Protection against electric shock by means of protective separation up to 1800 V AC/DC according to EN 61140 Test voltages up to 15 kV AC Excellent transmission characteristics:
	– Gain error < 0.5 % with crest factor < 3
	– Gain error < 1 % with crest factor 3...5
	– Rise time T90 < approx. 150 ms
Virtually not influenced by common-mode voltages: CMRR approx. 150 dB Very high flexibility due to
	– selection of up to 16 calibrated input/output ranges
	– up to 16 customer-specific ranges
	– VariPower® 20 V to 253 V AC/DC broad-range power supply
Reliable function even with instable power supply No damage in the case of erroneous power connection Switchable models minimize required device variants and save stockkeeping costs Vacuum encapsulation ensures high stability Mechanically stable for operation on ships, rail and road vehicles 5-year warranty

Devices	AC input	Output TRMS value	Working voltage	Test voltage	Order no.
VariTrans® P 42000 TRMS Input and output switchable	10 V ... 1200 V AC; 1 to 16 ranges to customer requirement (range spread limited)	0 … 20 mA, 4 ... 20 mA, and/or 0 … 10 V, 1 to 16 ranges to customer requirement	≤ 2.2 kV AC/DC	10 kV AC	P 42000 D2 TRMS-nnnn
	1200 V ... 2200 V AC; 1 to 16 ranges to customer requirement (range spread limited)	0 … 20 mA, 4 ... 20 mA, and/or 0 … 10 V, 1 to 16 ranges to customer requirement	≤ 2.2 kV AC/DC	10 kV AC	P 42000 D3 TRMS-nnnn
VariTrans® P 42100 TRMS input and output with fixed settings	10 V ... 1200 V AC; to customer requirement	0 … 20 mA, 4 ... 20 mA, or 0 … 10 V, to customer requirement	≤ 3.6 kV AC/DC	15 kV AC	P 42100 D2 TRMS-nnnn
	1200 V ... 3600 V AC; to customer requirement	0 … 20 mA, 4 ... 20 mA, or 0 … 10 V, to customer requirement	≤ 3.6 kV AC/DC	15 kV AC	P 42100 D3 TRMS-nnnn
“Specific Test Report“ included in shipment
Power supply
20 ... 253 V AC/DC

	Dimension drawings and terminal assignments