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Shunyang brand DJ series three-phase (single-phase) capacitive voltage transformer (CVT) online monitoring device is a high-end capacitive voltage transformer online monitoring device developed by our company. It can monitor Ua, Ub, Uc, 3Uo (for single The phases are Ua, UL) for collection, display and over-limit alarm, which is one of the necessary means for the monitoring of capacitive voltage transformers in substations. Main technical performance and parameters:
1.1 Sampling value
Line or bus CVT voltage Ua, Ub, Uc, UL;
Line or busbar CVT open delta voltage 3Uo;
1.2 Warning conditions
1.2.1 Line or busbar CVT open delta voltage 3Uo amplitude over-limit alarm
When the following three conditions are met at the same time, a 3Uo amplitude over-limit alarm is reported:
The monitored CVT is under pressure, that is, when Ua>USET1;
3Uo is greater than its set value USET2 (such as 1.5V);
The duration is greater than the delay time t1 (such as 30s).
1.2.2 CVT voltage imbalance alarm
a, three-phase CVT (500kV line, 220kV and below busbar or line voltage transformation of line transformer group wiring mode)
The monitored CVT has voltage (phase voltage, non-voltage setting value USET1 ≤0.3Ue, Ue is the rated voltage value);
Compared with the single-phase voltage value, the absolute value of any two-phase voltage amplitude difference is greater than the fixed value B△U1 (such as 3%) of the unbalance degree between phases, namely
/Ua>B△U1 or / Ub>B△U1
/Ub>B△U1 or / Uc>B△U1
When /Ua>B△U1 or / Uc>B△U1
And the duration is greater than the delay time t2 (such as 30s).
b. Single-phase CVT (500kV bus, 220kV and below lines and bypass bus voltage change)
Line CVT (220kV and below line and bypass busbar voltage change)
The monitored CVT has pressure (the setting value of no pressure is USET1≤0.3Ue);
The circuit breaker is in the closed position (the CVT works on a certain bus);
Compared with the single-phase voltage value, the absolute value of the voltage difference between the monitored CVT voltage UL and the voltage after the busbar switching has the same name (such as Ua) is greater than the unbalance setting value B△U2 (such as 2%), that is
/Ua>B△U2 or /UL>B△U2
The duration is greater than the delay time t3, generally 30s.
c. Bus CVT (500kV bus)
The monitored CVT has pressure (the setting value of no pressure is USET1≤0.3Ue);
For 500KV voltage level, the 3/2 wiring mode side circuit breaker is in the closed position (such as 5011 closed position, it means 5011 switch is connected to 500kV Ⅰ bus; if 5013 closed position, it means 5013 switch is connected to 500 kV Ⅱ bus);
Compared with the single-phase voltage value, the absolute value of the monitored CVT voltage Ua and the line CVT with the side circuit breaker in the closed position is greater than the unbalance setting value B△U2 (such as 2%), that is
/Ua>B△U2 or /UL>B△U2
The duration is greater than the delay time t4, (such as 30s).
1.2.3 Amplitude exceeding limit alarm
The monitored CVT has pressure (the setting value of no pressure is USET1≤0.3Ue);
Ua>KHUe (upper limit) or Ua<KLUe (lower limit);
Ub>KHUe (upper limit) or Ub<KLUe (lower limit);
Uc>KHUe (upper limit) or Uc<KLUe (lower limit);
UL>KHUe (upper limit) or UL<KLUe (lower limit);
The duration is greater than the delay time (such as 30s).
1.2.4 CVT monitoring and warning
If any next condition is met, the CVT abnormal alarm will be alarmed and the CVT abnormal pending light will flash.
Condition 1: CVT 3Uo over-limit alarm
Or Condition 2-1: Three-phase CVT unbalance alarm
Or Condition 2-2: Single-phase CVT abnormal alarm
Or condition 3: Voltage amplitude exceeds limit alarm
Alarm form: CVT abnormal light flashes, and the alarm normally open relay contact of the monitoring device is closed, and the contact signal is output; the device also has a controllable buzzer alarm function.
1.3 Other functions
1.3.1 During a power outage, the built-in lithium battery maintains the timing and the ferroelectric memory saves statistical data, but no sampling and statistics are performed.
1.3.2 The internal clock can automatically convert day, month and year.
1.3.3 On the PVC panel, the button has a beeping answer.
1.3.4 has Watchdog function. When the program is running, once it "crashes", it returns to normal by itself within 13ms.
1.4 Sampling period 250ms
1.5 Display period 1s (display the average value of 4 samples).
1.6 Display form
Display the voltage value and set value with a 5-digit LED digital tube;
Display the clock with 6-digit LED digital tube.
1.7 accuracy
1.7.1 Measuring range: Un+20.5% -90% (Un is the rated value of the measured voltage); for 3Uo, it is within 0~2.2V.
1.7.2 Comprehensive measurement error (within the range of Un±20%): re≤±0.5%; for 3Uo: the rated value is 1.75V, and re≤±0.5% within 1.4V~2.1V.
1.7.3 Sensitivity: K≤0.5%
1.7.4 Clock error: ≤±1s/d
1.7.5 Power consumption of signal input circuit: ≤0.6VA
1.7.6 Power circuit power consumption: ≤3VA
1.7.7 Data memory capacity: 32K, using ferroelectric memory (FRAM).
1.7.8 Saving time of power failure data: >10a (counted from the day the device leaves the factory)
1.8 Communication performance
1.8.1 Communication interface
Transmission mode: asynchronous transmission
Data rate: 9600bps
Interface interface: V2.4/RS232
Data bits: 8 bits
Parity: None
Stop bit: 1 bit
Flow control: software
1.8.2 Communication medium: adopt Heshi standard MODEMT and ordinary dial line to realize point-to-point communication.
1.8.3 Man-machine mutual interface: Graphical interface is adopted, which can be operated visually with mouse and keyboard. The man-machine interface is friendly and the operation is convenient and simple.
1.8.4 All the statistical values ​​of each channel calculated by the device can be communicated and sent.
1.9 Normal use conditions of the device
The device can work continuously for a long time without interruption.
1.9.1 Ambient temperature: -5℃~+40℃; limit temperature: -20℃~+50℃
1.9.2 Relative humidity: 40℃(20~90)%RH
1.9.3 Atmospheric pressure: 79.5~106.0kPa (altitude 2000m and below)
1.9.4 AC power supply: AC220V or DC110V (subject to the power supply voltage marked on the rear panel of the device)
1.10 Overall dimensions (l×b×h)
Slot-mounted type: 160×236×80mm Installation opening size: 150+1×70+1mm
Hanging type: 260×150×98mm
1.11 weight
Slot-mounted type: 1.4kg; hanging type: 2.1kg
1.12 CVT abnormal alarm output normally open contact capacity: 3A/25VAC or 28VDC

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