Low‑voltage Intelligent Capacitor

The JN-E series Intelligent Integrated Power Capacitor Compensation Device (hereinafter referred to as the intelligent capacitor) adopts power parameter detection technology, reactive power compensation control technology, display technology, power capacitor switching control technology, intelligent capacitor networking technology, fault monitoring and protection technology, and is composed of power capacitors and circuit breakers. A single intelligent capacitor can form a complete compensation system. Up to 32 units of common-phase and split-phase intelligent capacitors can be combined arbitrarily for application. No control parameters need to be configured, and the device can run normally upon power-on, featuring simple and flexible operation. It is mainly applied for static reactive power compensation in 0.4 kV power systems, to improve the power factor of power grid, reduce grid losses, increase the output capacity of transformers, enhance voltage output quality, and avoid penalties for power-factor adjustment charges.

① Compact and mini-size structure with fully integrated secondary circuits within one enclosure, delivering neat and clean appearance.

② Models of different specifications can be combined arbitrarily according to compensation requirements, featuring wide application scope.

③ Adopts low-power-consumption design, achieving higher energy-saving performance compared with conventional compensation structures.

④Zero-cross switching technology is applied; no inrush current during switching-on (less than 2 times rated current), and no electric arc upon switching-off.

⑤ Intelligent networking function: faulty circuits are automatically disconnected from the network, and newly-added circuits are automatically connected to the network.

⑥ Extremely fast networking speed; automatic networking can be completed within 18 seconds at power-on, reducing commissioning waiting time.

⑦ Automatically identifies the homonymous terminals of current signals to avoid abnormal operation caused by reverse installation of current transformers on busbars.

⑧ Takes the average power factor within the delay period as the reference limiting physical quantity to reduce unnecessary switching operations.

⑨ Multiple protection functions are available, including over-voltage, under-voltage, under-current, phase loss, over-harmonic and over-temperature protection, to enhance system stability.

⑩ Backlit LCD display shows various electrical parameters, switching status and alarm status.

⑪ Equipped with manual switching-on / switching-off function.

⑫ The maximum networking quantity is 32 units for both the automatic control system and controlled system.

(1) Nomenclature of Conventional Intelligent Capacitors

(1)Outline Drawing of Low‑voltage Intelligent Capacitor

  Product Dimensions of Conventional Low‑voltage Intelligent Capacitor：

Ordering Note: Standard products are not equipped with tuning reactors and shall not be applied in harmonic-present environments. For applications under harmonic conditions, please select the anti-harmonic series.

If no intelligent capacitor controller is configured for the system, a current-signal adapter shall be purchased separately.

( 2 ) Optional Accessories

①Voltage range: Line 400 V±20%; Phase 230 V±20%

②Signal current: AC 0-5 A

③Rated frequency: 50 Hz±2 Hz

④Ambient temperature:-20 ℃ ~ +45 ℃

⑤Distortion environment: Voltage distortion rate less than 5%

⑥Maximum altitude: Less than 2500 m

⑦Ambient conditions: No explosive hazard in surrounding medium; no gas that may damage insulation or corrode metal; no conductive dust.

⑧Relative humidity: ≤90% at 20 ℃; higher relative humidity is permitted at lower temperatures.

⑨Applicable standard: GB/T 15576

① After the low‑voltage intelligent capacitor are installed and powered-on, the CT parameter of the main cabinet must be configured (set to the transformation ratio value. For example, if the current transformer ratio is 2000:5, set the value to 400. Only the main unit needs configuration). Other parameters may adopt factory default values. This is the only parameter that requires setting for the low‑voltage intelligent capacitor system.

②When the capacity of the temporary power supply connected to the capacitor cabinetbus-bar is smaller than the rated capacity of the largest single capacitor, the intelligent capacitor provides a simulated switching function to avoid tripping upon capacitor switching-on. To activate this function, press and hold the designated key and key A simultaneously for 2 seconds after power-on, then release. The characters "Auto-Manual" will be displayed on the LCD to indicate function activation. Under this status, capacitors can be switched-on manually, the switching-on LED lights normally, while the capacitors are not actually put into service.

③For automatic switching test in sites where simulated current signal cannot be supplied, the product can be delivered after passing manual switching-on / switching-off action test with normal functions.

Temperature: ±2 ℃

Voltage: ±0.5%

Current: ±1%

Power: ±2.5%

Power factor: ±0.01

Total power consumption: Less than 3.5 VA

Switching inrush current: Less than 2In

Dynamic response time: ≤1 s

Network quantity: Max. 32 units (excluding intelligent capacitor controller)

Wiring Schematic for Common-Compensation Controller Scheme

Wiring Schematic for Mixed-Compensation Controller Scheme

Wiring Schematic for Autonomous Common-Compensation Scheme

Wiring Schematic for Autonomous Mixed-Compensation Scheme

(1) Alarm Information Generation Permission of Low‑voltage Intelligent Capacitor

Split-compensation Type：

Common-compensation Type：

(2) Meaning of Switching-Status LED Indicators

(3) Standard Key-Pad Operation for Low‑voltage Intelligent Capacitor

Key	Auto-Run Menu	Manual-Run Menu	Parameter Preset Menu	Remarks
	Selection of Display Items for Electrical Parameters.	Switch from Manual-Run Menu to Auto-Run Menu.	Select parameter item.
	\	Cycle capacitor switch-on.	Increment parameter value.
	\	Cycle capacitor switch-off.	Decrement parameter value.
	Enter Manual-Run Menu.	\	Exit Parameter Preset Menu.
	Enter Simulated Manual-Run Menu.	\	\	Combination key valid upon 2-second long press.Capacitor will not be physically switched-on.
	Enter Parameter Preset Menu.	\	\	Long-press combination key for 2 seconds.

Note: On the control parameter preset interface and fine-tuning electrical parameter interface, if no key is operated by the user within 60 seconds, the Intelligent Capacitor will abort the current operation and return to the auto-run interface.
 

(4) List of Control Parameters (1-Circuit Standard Split-Compensation)

No.	Display Interface	Parameter Description	Default Parameter	Parameter Range	Remarks
1		Sum of three-phase capacitor capacity
2		Capacitor capacity	0	0-0
3		Switch-on power factor	Lag 0.95	Lag 0.9 ~ Lead 0.9
4		Switching delay (s)	30	1-180
5		Main-cabinet CT ratio	100	Au-10-1000	Au Automatic Recognition of CT Ratio①
6		Networking address	AU	0-1-32-AU	0: Master Address   1-32: Slave Address   AU Auto-address②
7		Over-temperature protection threshold (℃)	65	OFF-40-80	OFF: Temperature Protection Disabled③
8		Level-1 over-voltage (V)	248	243-254	Prohibited Switch-on Voltage④
9		Level-2 over-voltage (V)	260	254-277	Over-voltage Switch-off Voltage⑤
10		Under-voltage (V)	185	185-196	Under-voltage Switch-off Voltage⑥
11		Over-voltagedistortion rate (%)	5.0	OFF-2.0-10.0	OFF: Over-voltage Distortion Protection Disabled⑦
12		Current harmonic protection	30	OFF-10.0%-99.9%
13		Delay protection	2	1-20
14		Capacitor over-current threshold	1.50	OFF-1.1-1.6
15		Under-current (mA)	OFF	OFF-80-500	OFF: Under-current Protection Disabled
16		Capacitor discharge delay (s)	2	2-180
17		Voltage unbalance factor	OFF	OFF-10-40
18		Switch-off power factor	1.00	Lag 0.92 ~ Lead 0.88
19		Capacitor rated voltage (V)	250	220-360
20		Host communication address	Aut	1-247-Aut
21		Communication baud rate	9600	2400-115200
22		Parity check	OFF	OFF-Odd-EuEn

(5) List of Control Parameters (2-channel Common-phase Compensation Type)

No.	2-Channel Common-phase Compensation Type	Parameter Description	Default Parameter	Parameter Range	Remarks
1		Capacitance of 1st Circuit (kvar)
2		Capacitance of 2nd Circuit (kvar)
3		Switch-on Factor	Lag 0.95	Lag 0.9-Lead 0.9
4		Switching Delay (s)	30	1-180
5		Main Cabinet CT Ratio	Au	Au-10-1000	Au Automatic Recognition of CT Ratio①
6		Networking Address	AU	0-1-32-AU	0: Master Address   1-32: Slave Address   AU Auto-address②
7		Over-temperature Protection Temperature (℃)	65	OFF-40-80	OFF: Temperature Protection Disabled③
8		1st-stage Over-voltage (V)	429	420-440	Prohibited Switch-on Voltage④
9		2nd-stage Over-voltage (V)	450	440-480	Over-voltage Switch-off Voltage⑤
10		Under-voltage (V)	320	320-340	Under-voltage Switch-off Voltage⑥
11		Over-voltage Distortion Rate (%)	5.0	OFF-2.0-10.0	OFF: Over-voltage Distortion Protection Disabled⑦
12		Current Harmonic Protection	30	OFF-10.0%-99.9%
13		Delay Protection	2	1-20
14		Capacitor Over-current Threshold	1.50	OFF-1.1-1.6
15		Under-current (mA)	OFF	OFF-80-500	OFF: Under-current Protection Disabled
16		Capacitor Discharge Delay (s)	2	2-180
17		Switch-off Factor	1.00	Lag 0.92-Lead0.88
18		Capacitor Rated Voltage (V)	450	400-600
19		Host PC Communication Address	Aut	1-247-Aut
20		Communication Baud Rate	9600	2400-115200
21		Parity Check	OFF	OFF-Odd-EuEn

① Indicates that the CT ratio is automatically identified after the networking of intelligent capacitors is completed. For example, for a 500/5 current transformer, the ratio value is 100.

② Indicates the networking mode of intelligent capacitors. 0-32 are parameters for manual address setting mode (1-32 stands for slave address); AU represents the auto-address mode.

③ Operating hysteresis: 5 °C.

④ Capacitor switching-on is prohibited when exceeding this threshold.

⑤ The capacitor shall be switched-off when exceeding this threshold.

⑥ The capacitor shall be switched-off when falling below this threshold.

⑦ Operating hysteresis: 2%. OFF: Over-voltage distortion protection is disabled.

Note: When the compensation system networking is completed or the control parameters of the master unit are modified, the master unit will overwrite its own control parameters to all slave units. After the master unit exits abnormally, the new master unit shall operate with user-preset parameters upon re-networking.

Note 1: Capacitor property parameters will not be overwritten (capacitance value, capacitor rated voltage, series reactance rate).

Note 2: When an intelligent capacitor controller or split-phase-compensation intelligent capacitor operating in split-phase mode acts as the master unit and overwrites parameters for common-phase-compensation intelligent capacitors, the threshold values of 1st-stage over-voltage, 2nd-stage over-voltage and under-voltage shall be multiplied by 1.732 respectively before overwriting.

(6) Networking Display Interface

Display Interface	Interface Description	Display Interface	Interface Description
	Cd-- Stands for software version. 2.0 Software Version Number.		Cd-- Stands for software version.2.0 Software Version Number.

Note: Electrical parameters shall be displayed immediately after networking is completed.

(7) Electrical Parameter Display-2-channel Common-phase Compensation Main Unit

Display Interface	Interface Description	Display Interface	Interface Description
	Display AC Phase Voltage (V). Display Power Factor.		Display Current Distortion Rate (%)
	Display secondary current signal amplitude (A) of sampling current transformer.  Display reactive power magnitude (kvar).		Display Capacitor Body Temperature (℃)
	Display Voltage Distortion Rate (%)		Display Number of Connected Slave Units

(8)Electrical Parameter Display-2-channel Common-phase Compensation Slave Unit

Display Interface	Interface Description	Display Interface	Interface Description
	Display Slave Unit Address		Display Voltage Distortion Rate (%)
	Display AC Phase Voltage (V)		Display Capacitor Body Temperature (℃)

(9)Electrical Parameter Display

Display Interface	Interface Description	Display Interface	Interface Description
	Display Phase A Voltage (V). Display Phase A Power Factor.		Display Phase A Voltage Distortion Rate (%)
	Display Phase B Voltage (V). Display Phase B Power Factor.		Display Phase B Voltage Distortion Rate (%)
	Display Phase C Voltage (V). Display Phase C Power Factor.		Display Phase C Voltage Distortion Rate (%)
	Display Phase A sampling current transformer secondary current signal amplitude (A). Display Phase A reactive power magnitude (kvar).		Display Phase A Current Distortion Rate (%)
	Display Phase B sampling current transformer secondary current signal amplitude (A). Display Phase B reactive power magnitude (kvar).		Display Phase B Current Distortion Rate (%)
	Display Phase C sampling current transformer secondary current signal amplitude (A). Display Phase C reactive power magnitude (kvar).		Display Phase C Current Distortion Rate (%)
	Display Capacitor Body Temperature (℃)		Display Number of Connected Slave Units

1-channel Split-phase Compensation Main Unit,2-channel Split-phase Compensation Main Unit,1-channel Common-phase Compensation + 1-channel Split-phase Compensation Main Unit.

(10) Electrical Parameter Display

Display Interface	Interface Description	Display Interface	Interface Description
	Display Slave Unit Address		Display Phase B Voltage Distortion Rate (%)
	Display Phase A Voltage (V). Display Phase B Voltage (V).		Display Phase C Voltage Distortion Rate (%)
	Display Phase C Voltage (V)		Display Capacitor Body Temperature (℃)
	Display Phase A Voltage Distortion Rate (%)

1-channel Split-phase Compensation Slave Unit, 2-channel Split-phase Compensation Slave Unit, 1-channel Common-phase Compensation + 1-channel Split-phase Compensation Slave Unit.

(1) After networking is completed, the master unit shall be generated in the priority order: intelligent capacitor controller, split-phase compensation intelligent capacitor, common-compensation intelligent capacitor.

(2) One compensation system consists of one master unit and several slave units. The maximum total quantity shall not exceed 32 units.

(3) The automatic networking process will be triggered upon each power-on or modification of capacitor attribute parameters. The whole process lasts approximately 18 seconds. The number of units has little influence on the networking duration. 

(4) Auto-address mode and manual-set address mode shall not coexist within the same network; otherwise, networking abnormality will occur.

(5) Under auto-address mode, the address codes assigned to each intelligent capacitor after each networking cycle will be different. This may change the matching relation with the switching indicator lamp positions on the capacitor cabinet, but will not affect normal operation of the whole compensation system. If this situation is unacceptable to users, fixed matching relation can be realized by manually setting address codes. Rules for address setting: the master unit shall always be set to 0; slave unit addresses range from 1 to 32. Slave unit addresses must start from 1, configure common-compensation units first, then split-phase compensation units. The priority for taking the role of master unit shall follow the sequence below:  ①Intelligent capacitor controller; ② Split-phase compensation intelligent capacitor; ③ Common-compensation intelligent capacitor.For example, if both split-phase and common-compensation intelligent capacitors exist in one system, common-compensation intelligent capacitors shall not be configured as the master unit.

(6) If the master unit fails and cannot perform master-unit functions, it shall automatically quit the network and will not join re-networking until the fault is cleared. The remaining intelligent capacitors will re-establish networking and resume operation after a maximum delay of approximately 30 seconds.

Comparison of Advantages and Disadvantages between Auto-address Mode and Manual-set Address Mode

Split-phase compensation intelligent capacitor (1-channel split-phase) is factory-default enabled.

Common-compensation intelligent capacitor is factory-default enabled.

① When the main unit operates under auto-address mode, upon completion of networking or after controller parameter modification, the main unit shall change all slave-unit address codes to auto-address mode via broadcast messages. When users need to switch from manual-set address mode to auto-address mode, modification on the master unit alone is sufficient.

Note: Main Unit Enable means that when the intelligent capacitor works in main-unit mode, it overwrites parameter items to all slave units. Slave Unit Enable means that when the intelligent capacitor works in slave-unit mode, its parameter items will be overwritten.

Digital Prompt Character	Prompt Meaning
EEE - XX	Relay Sticking Fault 2-channel Common-phase Compensation：EEE-A1,EEE-C1;EEE-A2,EEE-C2 1-channel Split-phase Compensation：EEEE-A;EEEE-b;EEEE-C 2-channel Split-phase Compensation：EEE-A1;EEEE-b1;EEEE-C1EEE-A2;EEE-b2;EEE-C2 1-channel Common-phase Compensation plus 1-channel Split-phase Compensation：EEE-A1,EEE-C1,EEEE-A;EEEE-b;EEEE-C
	Recoverable Switching Oscillation Fault  1.Caused by over-voltage distortion rate 2.Caused by over-current distortion rate 3.Caused by overvoltage 4.Caused by under-current 5.Caused by over-compensation
	Networking Fault (Address Mode or Address Conflict)
	Networking Message Transmission Fault (Hardware Fault)
	Preset Parameter Time-out Error
	Discard modified parameters during parameter presetting
	Communication Error with Synchronous Switch
	Synchronous Switch Fault (Specific faults shall be queried via intelligent capacitor controller)
	Failed to connect to existing slave units
	Save modified parameters
	Total current less than 80 mA (Sensitivity)
Over-voltage	Voltage signal exceeds over-voltage threshold
Under-voltage	Voltage signal falls below under-voltage threshold
Distortion Rate	Distortion rate of voltage and current signals exceeds distortion threshold
Over-temperature	Temperature of intelligent capacitor body exceeds limit
Under-current	Secondary current of main cabinet is lower than under-current threshold
Phase	Phase difference between current and voltage is in quadrant 2 & 3 (auto-correctable)

Thank you for purchasing our products, which gives us the opportunity to provide you with high-quality services. To achieve better service experience, please read this manual carefully after purchase.

(1) Warranty Period

Within one year from the date of delivery, under the condition that users comply with the requirements specified in this manual and the top cover is not disassembled, our company shall be responsible for free repair for any product quality defects. Lifetime repair service is available after the one-year warranty period. If there is a signed contract, the terms of the contract shall prevail.

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