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User’s
Manual

取扱説明書

2041

携帯用単相電力計

Portable Single-phase Wattmeter

IM 2041-01

2018. 3　7 版

7th Edition: March 2018

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Summary of Contents for 2041

Page 1: ...User s Manual 取扱説明書 2041 携帯用単相電力計 Portable Single phase Wattmeter IM 2041 01 2018 3 7 版 7th Edition March 2018 ...

Page 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 ...

Page 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...

Page 4: ...員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 2041 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 ...

Page 5: ...that is used to measure DC and AC electric power in laboratories and factories The single phase wattmeter Model 2041 01 2041 02 and 2041 03 can measure DC power with a frequency of 25 to 1000 Hz The low power factor wattmeters Model 2041 11 to 2041 22 can be used for carrying out an Epstein frame test on core loss or for measuring either power of a low power factor or low levels of electric power ...

Page 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...

Page 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...

Page 8: ...t As shown in Figure 2 1 connect between the voltage terminal and the current terminal A while making sure the voltage terminal is connected to the load side If the pointer deflects backward swap over the connections to the two voltage terminals Measured power watt indicator reading range multiplier To minimize the external magnetic field influence on the DC power measurement use the mean value of...

Page 9: ...2041 01 電源 Power Source 負荷 Load Fig 2 3 Fig 2 4 Fig 2 5 電源 Power Source 負荷 Load 電源 Power Source 負荷 Load CT L K k CT L K k U V v VT u U V v VT u Fig 2 1 電源 Power Source 負荷 Load Fig 2 2 電源 Power Source 負荷 Load ...

Page 10: ...e 2 3 Measured power watt indicator reading range multiplier CT ratio 3 Single phase power measurement where the voltage exceeds its rated value Connect a voltage transformer VT to a voltage circuit as shown in Figure 2 4 Measured power watt indicator reading range multiplier VT ratio 4 Single phase power measurement where both the voltage and the current exceed their rated values Connect a VT to ...

Page 11: ...tions of the two wattmeters When the power factor of the circuit to be measured id greater than 50 both of the wattmeters connected as shown in Fig 2 6 indicate positive values The measured three phase power is the algebraic sum of the indications on these two meters When the power factor of the circuit to be measured is less than 50 the pointer on one of the two wattmeters will deflect backward o...

Page 12: ...nt ranges are changed by selecting terminals The ratio of the voltage ranges is 2 1 The ratio of the current ranges is 5 1 2 Be sure not to open the secondary circuit of the CT when changing the measuring 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 swi...

Page 13: ...ter will go overscale Estimate the approximate value of the power to be measured and then select a suitable rated power range equal to or higher than the estimated value Remember the instrument is a highly sensitive meter five times more sensitive than an ordinary wattmeter whose power factor 1 Therefore at the rated power factor of 0 2 the rated voltage and rated current when the pointer indicate...

Page 14: ...used to convert the value read on the 120 division scale to a power value In other words the power can be calculated from equation 1 Eq 1 Load power meter indication range multiplier The range multipliers depend on the voltage and current range settings and are calculated from equation 2 Range multiplier rated current A rated voltage V rated power factor 1 0 Eq 2 number of divisions 120 Example In...

Page 15: ... itself must be subtracted from the meter reading 1 Correction when the voltage coil is connected to the load side If the power source impedance is low and the voltage fluctuation is small or the load power is comparatively small the connections are as shown in Fig 3 1 and the power loss of the voltage coil is almost the same as the indication when the load is disconnected If the power source impe...

Page 16: ...d side If the current coil is connected to the load side through the voltage coil as shown in Fig 3 3 and the voltage connection is moved from P to Q the wattmeter will indicate the power loss of the current coil Subtract this value from the reading on the scale to obtain the true load power Fig 3 3 電源 Power Source 負荷 Load 電源 Power Source 負荷 Load MC FC V A P P Q Q MC 電圧コイル Voltage Coil FC 電流コイル Cu...

Page 17: ...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 ...

Page 18: ...041 22 DC 25 to 500 Hz Effect of Self 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 2 10 C approx 0 25 10 C Effect of External Magnetic Field Less than 0 65 approx at 400 A m 0 8 Effect of Power Factor Less than 0 5 for power factor 1 0 and 0 5 The indication at the p...

Page 19: ... A 1 A 5 A 30 V 1 2 W 6 W 6 W 30 W 60 V 2 4 W 12 W 12 W 60 W 1500 Ω 3000 Ω 31 3 Ω 1 09 Ω 1 70 Ω 0 06 Ω 0 6 VA 1 2 VA 1 25 VA 1 09 VA 1 70 VA 1 50 VA 電圧レンジ電流レンジの消費電力の和が2041の総合消費電力になります Total volt ampere loss of the 2041 volt ampere loss of voltage range volt ampere loss of current range 単相電力計 Single phase Wattmeter Rated Current 定格 Rating Range 形名 Model Power Rating Approx Internal Impedance Appr...

Page 20: ... 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...

Page 21: ...Printed in China ...

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