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IM 2042-01

—  ii  —

本器および取扱説明書には安全記号 

 が表示されています。

この安全記号は,人体および機器を保護するために,取扱注意
の警告,取扱説明書や添付資料を必ず読む必要があることを 
警告しています。

 警 告

感電の恐れがありますので,以下のことを必ず守って

ください。

・ 計器および付属機器を接続する場合は,回路が活線状態で

ないことを確認してから行ってください。

・ 接続端子は,緩みのないように確実に締め付けてください。
・ 通電中は,入力端子およびその他の端子またはプラグ挿入

口等に触れないでください。

・ 通電中は,ケースおよびカバーを開けないでください。
・ 外付変流器と組み合わせて使用する場合,変流器の 1 次側

に通電されている状態で 2 次側をオープンにすると危険電
圧が発生しますので,計器をはずす前に 2 次側を短絡して
ください。

・ 定格電流,定格電圧を超える入力を加えないように注意し

てください。

The safety symbol 

 is shown both on the instrument and 

throughout the instruction manual to draw attention to the necessary 

safety precautions. 

 WARNING

To avoid injury or death to personnel and damage to the 

instrument, be sure to comply with the following.

•  Make  sure  that  the  source  voltage  is  not  alive  before  you 

attempt to connect the instrument to the circuit. 

• Once you have connected the instrument to the circuit, tighten 

the terminals.

•  Never  touch  the  terminals  or  plug  holes  when  operating  the 

instrument. 

• Never open the case or cover when operating the instrument. 
• In an application where the instrument is used in combination 

with an external current transformer, a hazardous voltage will 
develop if the transformer’s secondary stage is open-circuited 
with the primary stage electrified. Be sure to short-circuit the 
secondary  stage  before  removing  the  instrument  from  the 

transformer.

• Be sure not to exceed the rated current and the rated voltage.

Содержание 2042

Страница 1: ...User s Manual 取扱説明書 2042 携帯用三相電力計 Portable Three phase Wattmeter IM 2042 01 2018 3 7 版 7th Edition March 2018 ...

Страница 2: ...f operation service and repair of this instrument Failure to comply with these precautions or with specific WARNINGS given elsewhere in this manual violates the safety standards of the design manufacture and intended use of the instrument YOKOGAWA assumes no liability for the customer s failure to comply with these requirements This manual is part of the product and contains important information ...

Страница 3: ...ath to personnel and damage to the instrument be sure to comply with the following Make sure that the source voltage is not alive before you attempt to connect the instrument to the circuit Once you have connected the instrument to the circuit tighten the terminals Never touch the terminals or plug holes when operating the instrument Never open the case or cover when operating the instrument In an...

Страница 4: ...にお申 しつけください 当社製品の保証期間はご納入日より 1 年間です この間に発 生した故障で 原因が明らかに当社の責任と判定された場合 には無償修理いたします Warranty The 2042 instruments are shipped only after stringent in house inspection Should the instrument suffer damage that is attributable to improper manufacture or an accident during transport contact the sales representative from which you purchased the product or your nearest YOKOGAWA sales office All products o...

Страница 5: ...is an electrodynamic portable three phase wattmeter with taut band suspension movement It is designed to measure the electrical power of three phase three wire circuits in both laboratories and in the field with high accuracy It can also be used to measure single phase power The 2042 can be used for signals with a frequency between 25 Hz and 1000 Hz ...

Страница 6: ...Terminals One of the terminals is marked with to show the polarity relation to the voltage coil and the two alternative current terminals are marked with their respective current ratings Table of Range multiplier Constants The table is located on the side of the instrument case and the actual power value is obtained by multiplying the constant listed in the table by the indication value on the sca...

Страница 7: ...her as possible 4 Before wiring any of these instruments carefully check the measuring ranges and polarities When wiring securely fasten the terminals When a large current needs to be measured use wire that is both thick enough and has sufficient current carrying capacity 5 Before measurement check that the pointer coincides exactly with the zero scale point If it does not turn the zero adjust scr...

Страница 8: ...nals P1 and P3 are connected to the load side Measured power watt indicator reading range multiplier 2 Three phase power measurement where the current exceeds the rated value Connect a current transformer CT to a current circuit as shown in Figure 2 2 Measured power watt indicator reading range multiplier CT ratio 3 Three phase power measurement where the voltage exceeds its rated value Connect a ...

Страница 9: ...and the current exceed their rated values Connect a VT to a voltage circuit and a CT to a current circuit as shown in Figure 2 4 Measured power watt indicator reading range multiplier VT ratio CT ratio Example Instrument terminals connected 120 V at 5 A Range multiplier 10 Indicator reading 100 VT ratio 6600 110 V CT ratio 50 5 A Measured power watt 100 10 6600 110 50 5 600 000 watts W 600 kilowat...

Страница 10: ...range multiplier 0 5 To minimize the external magnetic field influence on the DC power measurement use the mean value of the power levels measured when the terminals are connected as shown in Figure 2 5 or 2 6 単相で測定 試験 を行なう場合には 三相測定 試験 より 値が 0 2 0 3 最大値で 低い値になること もあります 注 記 NOTE The power level obtained from single phase power measure ments may be 0 2 to 0 3 lower than that of three phase power mea...

Страница 11: ...tio of the voltage ranges is 2 1 The ratio of current ranges is 5 1 2 When using a current transformer be sure not to open the secondary circuit of the CT when changing the current range If the CT is provided with a switch to short the secondary circuit close the circuit using the switch before changing the measuring range If such a switch is not provided you can either switch off the power source...

Страница 12: ...multiplier constant table is attached to the side of the instrument and is used to obtain the actual measuring power from the reading on the scale In other words the actual power is calculated from equation 1 Eq 1 Load power indicator reading range multiplier The range multipliers depend on the voltage and current range settings and are calculated from equation 2 Range multiplier 2 rated current A...

Страница 13: ...oad side If high accuracy is desired or the rated power of the wattmeter is small less than 1 kW the power consumed by the coil must be subtracted from the indicated value 1 Compensation when the voltage coil is connected to the load side The connections for a power source with low impedance or for a relatively small load power are as shown in Fig 3 1 The power consumption of the voltage coil in t...

Страница 14: ...is large the true load power value can be obtained by connecting two voltmeters with known internal resistances as shown in Fig 3 2 and by performing the following calculation P W V V 1 r 1 r1 1 r 1 r2 2 1 2 2 P Load power W Power indicated on the wattmeter V1 V2 Voltages indicated on the voltmeter r Voltage circuit resistance of wattmeter r1 r2 Internal resistances of voltmeters 1 and 2 Fig 3 2 電...

Страница 15: ...e load side When the current coil is connected to the load side as shown in Fig 3 3 the meter will indicate the power consumption of the current coil when the load is balanced Subtract this value from the first readout to obtain the true load power Fig 3 3 電源 Power Source R S T R S T 負荷 Load 負荷 Load 電源 Power Source MC MC FC P3 P1 P2 A FC A MC 電圧コイル Voltage Coil FC 電流コイル Current Coil ...

Страница 16: ...irect sunlight 2 If an overload or excessive shock causes the accuracy of the instrument to become doubtful check several scale points and compare these readings with an instrument which has been properly calibrated If the accuracy of the instrument is found to be different from its rating readjust the instrument アフターサービス 正常な動作を示さず修理を要する場合には 当社または販売代理店へお申しつけく ださい NOTE If any troubles occur in the ...

Страница 17: ... Heating Less than 0 25 of full scale value approx Difference between Indication DC and AC Measurements Less than 0 1 of full scale value approx Effect of Temperature Less than 0 3 10 C approx Effect of External Magnetic Field Less than 1 0 approx at 400 A m Effect of Power Factor Less than 0 5 for a change in power factor from 1 0 to 0 5 Allowable Input Voltage Rated Voltage 1 5 approx Allowable ...

Страница 18: ... V 48 W 240 W 240 W 1 2 kW 1 2 kW 6 kW 240 V 96 W 480 W 480 W 2 4 kW 2 4 kW 12 kW 12000 Ω 24000 Ω 16 35 Ω 0 56 Ω 0 93 Ω 0 034 Ω 0 064 Ω 0 0027 Ω 1 2 VA 2 4 VA 0 66 VA 0 56 VA 0 93 VA 0 84 VA 1 72 VA 1 69 VA 電圧レンジ 電流レンジの消費電力の和の2倍が2042の概略総合消費電力になります Total volt ampere loss of the 2042 volt ampere loss of voltage range volt ampere loss of current range 2 三相電力計 Three phase Wattmeter 受注停止製品 Discontinued...

Страница 19: ... 3300 6600 V 二次 Secondary 定格負担 Burden 計器用変圧器 0 2級 Voltage Transformer 0 2 Note 1 The maximum line voltages are as follows 2241 3450 V 2242 6900 V 2244 2243 250 V Note 2 The instruments also have the following characteristics 2241 and 2242 Equipped with screw terminals for the 10 A 15 A 30 A 50 A and 100 A measuring ranges and with through hole terminals for the 250 A 300 A 500 A 750 A and 1500 A m...

Страница 20: ...Printed in China ...

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