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品牌:DCS、PLC
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联系人:叶经理
质保期:1年
加工定制:不可定制
产地/厂家:美国
最小/实际功率总计
•最小/无功功率总计
•最小/视在功率总和
•最小/THD/THD电压L-L
•最小/THD/THD电压L-N
•最小/THD/THD电流
•最小/频率
•最小/电压N-接地(见下文注释)
•最小/电流,中性(见下文注释)
注:Vng和In的最小/值不可从
陈列使用显示器读取寄存器(参见“读取和写入
第36页的“寄存器”或SMS中的PM800最小/读数表
(有关详细信息,请参阅SMS帮助)。
©2006施耐德电气。版权所有。
63230-500-22***1 PowerLogic®800系列功率表
6/2006第4章——计量能力
41
对于上面列出的每个最小/值,以下属性为
功率表记录:
•最小值的日期/时间
•最小值
•记录的最小值的相位
•值的日期/时间
•值
•记录值的相位
注:记录的最小/相位仅适用于多相位
量。
注意:有几种方法可以查看最小/值。这个
功率表显示可用于查看最小/值,因为:
仪表上次复位。使用SMS,一个具有
当月和上月的最小/值可以是:
查看。
©2006施耐德电气。版权所有。
PowerLogic®800系列功率表63230-500-22***1
第4章-计量能力6/2006
42
功率因数最小/约定
除功率因数外,所有运行的最小/值均为算术值
最小值和值。例如,最小相位
A-B电压是0至1200 kV范围内的***值,具有:
自上次重置最小/值后发生。相反
因为功率因数的中点是单位(等于1),所以功率
因子最小值/值不是真的算术最小值,并且
值。相反,最小值表示测量值
对于所有实时读数-0至1.00,在连续刻度上最接近-0
至+0。值是上最接近+0的测量值
同样规模。
下图4-1显示了典型环境中的最小/值
其中假设正功率流。在图中,最小
功率因数为-0.7(滞后),值为0.8(超前)。笔记
最小功率因数不需要滞后,并且
功率因数不需要超前。例如,如果
功率因数值范围为-0.75至-0.95,然后为最小值
功率因数为-0.75(滞后),功率因数
将为-0.95(滞后)。两者都是***的。同样,如果
功率因数范围从+0.9到+0.95,最小值为+0.75
值为+0.90(超前)。两者都是
在这种情况下为阳性。
图4-1:最小/功率因数示例
1
.4 .4
6.
8.
6.
8.
+0
2.
-0
2.
PLSD110165
***限度
功率因数
-.7(滞后)
功率范围
因子值
团结一致
限度
功率因数
.8(***)
领导
(+)
缓慢移动
(–)
注:假设功率流为正
©2006施耐德电气。版权所有。
63230-500-22***1 PowerLogic®800系列功率表
6/2006第4章——计量能力
43
也可使用备用功率因数存储方法
具有模拟输出和趋势。参见“注册列表”中的脚注
有关适用寄存器,请参见***24页。
功率因数符号约定
功率表可以设置为两个功率因数符号之一
惯例:IEEE或IEC。800系列功率表默认为:
IEEE功率因数符号约定。图4-2说明了两者
签署公约。有关更改功率因数符号的说明
惯例,请参阅上的“***功率表设置选项”
第26页。
图4-2:功率因数符号约定
真实的
权力
在里面
瓦特负(–)
变量正(+)
功率因数(–)
瓦特正(+)
变量正(+)
功率因数(+)
瓦特负(–)
变量负(–)
功率因数(–)
瓦特正(+)
变量负(–)
功率因数(+)
IEC功率因数符号约定
颠倒
功率流
典型的
功率流
反应性
通电
象限
2.
象限
1.
象限
3.
象限
4.
瓦特负(–)
变量正(+)
功率因数(+)
瓦特正(+)
变量正(+)
功率因数(–)
瓦特负(–)
变量负(–)
功率因数(–)
瓦特正(+)
变量负(–)
功率因数(+)
反应性
通电
真实的
权力
在里面
IEEE功率因数符号约定
颠倒
功率流
典型的
功率流
象限
2.
象限
1.
象限
3.
象限
4.
图4-3:功率因数显示示例
,#%0
-
-
J
J
J
J
权力
因子符号为
旁边可见
功率因数
阅读
©2006施耐德电气。版权所有。
PowerLogic®800系列功率表63230-500-22***1
第4章-计量能力6/2006
44
需求读数
功率表提供各种需求读数,包括
一致读数和预测需求。表4-2列出了
可用需求读数及其可报告范围。
表4-2:需求读数
可报告范围内的需求读数
需求电流,Pe
Min/Max Real Power Total
• Min/Max Reactive Power Total
• Min/Max Apparent Power Total
• Min/Max THD/thd Voltage L-L
• Min/Max THD/thd Voltage L-N
• Min/Max THD/thd Current
• Min/Max Frequency
• Min/Max Voltage N-ground (see the note below)
• Min/Max Current, Neutral (see the note below)
NOTE: Min/Max values for Vng and In are not available from the
display. Use the display to read registers (see “Read and Write
Registers” on page 36) or the PM800 Min/Max Reading Table in SMS
(refer to SMS Help for more information).
© 2006 Schneider Electric. All Rights Reserved.
63230-500-22***1 PowerLogic® Series 800 Power Meter
6/2006 Chapter 4—Metering Capabilities
41
For each min/max value listed above, the following attributes are
recorded by the Power Meter:
• Date/Time of minimum value
• Minimum value
• Phase of recorded minimum value
• Date/Time of maximum value
• Maximum value
• Phase of recorded maximum value
NOTE: Phase of recorded min/max only applies to multi-phase
quantities.
NOTE: There are a couple of ways to view the min/max values. The
Power Meter display can be used to view the min/max values since
the meter was last reset. Using SMS, an instantaneous table with the
current month’s and previous month’s min/max values can be
viewed.
© 2006 Schneider Electric. All Rights Reserved.
PowerLogic® Series 800 Power Meter 63230-500-22***1
Chapter 4—Metering Capabilities 6/2006
42
Power Factor Min/Max Conventions
All running min/max values, except for power factor, are arithmetic
minimum and maximum values. For example, the minimum phase
A-B voltage is the lowest value in the range 0 to 1200 kV that has
occurred since the min/max values were last reset. In contrast,
because the power factor’s midpoint is unity (equal to one), the power
factor min/max values are not true arithmetic minimums and
maximums. Instead, the minimum value represents the measurement
closest to -0 on a continuous scale for all real-time readings -0 to 1.00
to +0. The maximum value is the measurement closest to +0 on the
same scale.
Figure 4–1 below shows the min/max values in a typical environment
in which a positive power flow is assumed. In the figure, the minimum
power factor is -0.7 (lagging) and the maximum is 0.8 (leading). Note
that the minimum power factor need not be lagging, and the
maximum power factor need not be leading. For example, if the
power factor values ranged from -0.75 to -0.95, then the minimum
power factor would be -0.75 (lagging) and the maximum power factor
would be -0.95 (lagging). Both would be negative. Likewise, if the
power factor ranged from +0.9 to +0.95, the minimum would be +0.95
(leading) and the maximum would be +0.90 (leading). Both would be
positive in this case.
Figure 4–1: Power factor min/max example
1.00
.4 .4
.6
.8
.6
.8
+0
.2
-0
.2
PLSD110165
Minimum
Power Factor
-.7 (lagging)
Range of Power
Factor Value
Unity
Maximum
Power Factor
.8 (leading)
Lead
(+)
Lag
(–)
NOTE: Assumes a positive power flow
© 2006 Schneider Electric. All Rights Reserved.
63230-500-22***1 PowerLogic® Series 800 Power Meter
6/2006 Chapter 4—Metering Capabilities
43
An alternate power factor storage method is also available for use
with analog outputs and trending. See the footnotes in “Register List”
on page 124 for the applicable registers.
Power Factor Sign Conventions
The power meter can be set to one of two power factor sign
conventions: IEEE or IEC. The Series 800 Power Meter defaults to
the IEEE power factor sign convention. Figure 4–2 illustrates the two
sign conventions. For instructions on changing the power factor sign
convention, refer to “Advanced Power Meter Setup Options” on
page 26.
Figure 4–2: Power factor sign convention
Real
Power
In
watts negative (–)
vars positive (+)
power factor (–)
watts positive (+)
vars positive (+)
power factor (+)
watts negative (–)
vars negative (–)
power factor (–)
watts positive (+)
vars negative (–)
power factor (+)
IEC Power Factor Sign Convention
Reverse
Power Flow
Normal
Power Flow
Reactive
Power In
Quadrant
2
Quadrant
1
Quadrant
3
Quadrant
4
watts negative (–)
vars positive (+)
power factor (+)
watts positive (+)
vars positive (+)
power factor (–)
watts negative (–)
vars negative (–)
power factor (–)
watts positive (+)
vars negative (–)
power factor (+)
Reactive
Power In
Real
Power
In
IEEE Power Factor Sign Convention
Reverse
Power Flow
Normal
Power Flow
Quadrant
2
Quadrant
1
Quadrant
3
Quadrant
4
Figure 4–3: Power Factor Display Example
,#%0
-
-
J
J
J
J
The power
factor sign is
visible next to
the power factor
reading.
© 2006 Schneider Electric. All Rights Reserved.
PowerLogic® Series 800 Power Meter 63230-500-22***1
Chapter 4—Metering Capabilities 6/2006
44
Demand Readings
The power meter provides a variety of demand readings, including
coincident readings and predicted demands. Table 4–2 lists the
available demand readings and their reportable ranges.
Table 4–2: Demand Readings
Demand Readings Reportable Range
Demand Current, Per-Phase, 3Ø Average, Neutral
Last Complete Interval
Peak
0 to 32,767 A
0 to 32,767 A
Average Power Factor (True), 3Ø Total
Last Complete Interval
Coincident with kW Peak
Coincident with kVAR Peak
Coincident with kVA Peak
–0.002 to 1.000 to +0.002
–0.002 to 1.000 to +0.002
–0.002 to 1.000 to +0.002
–0.002 to 1.000 to +0.002
Demand Real Power, 3Ø Total
Last Complete Interval
Predicted
Peak
Coincident kVA Demand
Coincident kVAR Demand
0 to ± 3276.70 MW
0 to ± 3276.70 MW
0 to ± 3276.70 MW
0 to ± 3276.70 MVA
0 to ± 3276.70 MVAR