td1575 verification apparatus of meters for dc electrical energy -凯发k8国际

overview

td1575 is a set of apparatus specially applied to the verification of meters for dc electrical energy. it is composed of standard dc voltage source, dc current source, dc small signal voltage source, multi-station verification workbench, automatic verification software and so on. the accuracy of power/electrical energy is 0.02/0.05 optional, which supports automatic verification of 6~24 direct or indirect connected meters for dc electrical energy at the same time.

reference standards are gb/t 33708-2017 static meter for direct current energy and jjg 842-2017 verification regulation of electronic meters for measuring direct current electrical energy which tianheng participated in drafting .it is suitable for metrology institute, electric power department, manufacturers and users as the standards of dc power and electrical energy.

applications (class 0.05)

features

● dc voltage output:  the maximum value is 1150 v，which can meet the requirement of voltage test at 1.15un for 1 kv electrical energy meter.

● dc current output:  the maximum value is 120 a，which can can meet the  requirement of current test at 1.2in for 100a electrical energy meter.

● dc small signal voltage output: the maximum value is +4.4 v, which can be used as the current input (corresponding to shunt voltage) of indirect connected meters for dc energy, and meet the calibration requirements of forward and backward electrical energy meters.

the minimum output is as low as 10 μv, which is the basis for starting test of electrical energy meter.

● the annual accuracy of output voltage in millivolt level is 1 µv and the short-term stability is higher than 0.3 vrms/min，which meets the error test requirement of dc  meter with small load current (0.01in < i < 0.05in) under reference voltage.

● auxiliary power supply: it can provide dc 24 v, dc 48v or ac 220 v power supply for electrical meters (type a).

● clock verification: built in clock receiving module, it can display real-time clock and synchronize with beijing time.

● excellent load capacity: it ensures that the value is stable and accurate and works long hours at full load.

● multi-station verification workbench: automatic verification of 6~24 direct or  indirect connected meters is supported. the verification workbench is equipped with control panel, so the operator can observe and control the output value by its lcd touch screen, which facilitates manual verification. the high definition display window is embedded to facilitate users to observe and record the working status of the verified meters.

● the connecting wire of the four-wire small signal voltage and the meter is manufactured by professional technology, the thermoelectric voltage of which is less than 0.2μv, while the ordinary method is up to 20 μv.

● proprietary software: semi-automatic and full-automatic verification is realized, so as data management and certificate export.

technical specifications

dc voltage output

output characteristics：

● output range: 50 mv～1150 v

● resolution: 0.001%*rg

● display: 6 digits

● protection: short-circuit protection, overload protection

dc current output

output characteristics：

● output range: 20 μa～120 a

● resolution: 0.001%*rg 

● display: 6 digits

● protection: open-circuit protection, overload protection

● notes: the 200 μa/500μa /1ma current range provides the conditions for the start-up and latent test of current sensor access meter.

● automatic short-connection function is not supported, and and the short terminal is reserved.

dc small signal voltage output

output characteristics：

● output range: ± ( 10 μv～4.4 v )

● resolution: 0.002%*rg

● display: 6 digits

● protection: short-circuit protection, overload protection

● the shunt specifications and current-voltage ratio can be set, so the output value can be displayed as the voltage or current converted by the shunt.

● multi channel small signal dc voltage is isolated from each other and also isolated from high voltage circuit.

dc electrical energy / power

● accuracy (apparatus of class 0.05): ± 0.05%*rd

   accuracy (apparatus of class 0.02): ± 0.02%*rd

● output of standard electrical energy pulse (high frequency): full scale value corresponds to 60 khz.

   output of standard electrical energy pulse(low frequency): full scale value corresponds to 6 hz.

   frequency jitter of output pulse: < 10 μs

● input of standard electrical energy pulse: high frequency pulse less than or equal to 150khz with the amplitude of 5 v can be received.

● the electrical energy error is automatically displayed with the resolution of 0.0001%.

● difference of each position: < ± 0.025%

auxiliary power supply

● each station has 3 power supply modes: ac 220 v (isolation from power grid), dc 24 v and dc 48v

● ac 220 v load capacity: n*30 ma (n for station number), with replaceable fuse protection.

● dc 24 v load capacity: n*250 ma (n for station number), with short circuit and overload protection.

● notes: other types of power supply can be customized.

clock daily error

● standard clock accuracy: 2×10^-7

● error display modes of s / d and ppm / ppb are supported 

general specifications

● line power: ac ( 220 ± 22 ) v，( 50 ± 2 ) hz

● maximum consumption: 600 va

● operating environment: 15 ℃～35 ℃，30%～80% r·h，non-condensing

● storage environment: -20 ℃～70 ℃，< 95% r·h，non-condensing

● dimensions（width*depth*height）: 2800 mm × 700 mm × 1600 mm ( 16 stations workbench )

● standard interface: rs232、rs485

selection guidance