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AboutShijiazhuang Tonghe Electronic Technology Co., Ltd. is a high-tech enterprise dedicated to technological innovation, product innovation, and management innovation in the power electronics industry. It integrates R&D, manufacturing, sales, and service in the power electronics sector, providing customers with comprehensive energy solutions. -
ProductAfter more than two decades of rapid development, the company has established an industrial pattern covering three major business sectors: new energy, smart grid and aerospace. Its sales network covers more than 30 provinces, municipalities and autonomous regions nationwide, and its products are sold to overseas markets, winning high recognition from customers at home and abroad.
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PartnerIn the future, the company will continue to uphold its corporate mission of “embracing an entrepreneurial spirit, focusing on power electronics, efficiently utilizing energy, and serving global users,” while adhering to the core values of “contribution, mutual benefit, gratitude, efficiency, and innovation” to provide users with high-quality products and services.
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BlogsCommunicate with sincerity and courageously take responsibility; keep the customer at the center of our focus, continuously optimize the company’s management systems and processes, consistently identify and meet customer needs, deliver and enhance customer value, and maintain the company’s rapid growth.
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Join usThe company consistently upholds a talent philosophy centered on “people first,” actively fostering an atmosphere of respect, understanding, integrity, and friendliness. We provide a robust platform for talent development, enabling our employees to become powerful pillars of the company’s sustained growth and achieving mutual growth and shared success between the company and its talents.
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InvestorDisclose information relevant to investors’ decision-making in a truthful, accurate, complete, timely, and fair manner; strengthen communication and engagement with investors; and enhance and improve investor relations management.
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ContactWith a spirit of self-respect, self-reliance, and relentless self-improvement, coupled with an open mind, we focus on customer needs based on continuous learning and absorption. We dare to take risks, keep exploring, and steadily build management models and technological products that reflect our unique characteristics.
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No. 350, Lijiang Road, Shijiazhuang High-tech Zone
THD1000B4824Z-A-3G
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- Description
- Parameters
- Application
- Product Info
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Product Introduction
This product is a battery‑powered switch‑mode power supply for distribution automation terminals (DTUs), compliant with the requirements of power distribution network automation systems. It is widely used in substations, distribution stations, ring main units, intelligent packaged substations, smart switch controllers, and other applications that demand uninterrupted DC power supply under stringent performance criteria. Designed specifically for substation and ring main unit terminal equipment (DTU) systems, it can be paired with 7–40 Ah lead‑acid batteries, maintenance‑free gel batteries, lithium batteries, or supercapacitors to form a complete backup‑battery‑equipped power supply system. This system effectively meets the power needs of control units, communication units, and switching units, ensuring continuous power delivery to the load even during external power outages.
Product Features
·Wide input range, wide temperature range, high operating frequency, lightweight, compact size, and high reliability
·Meets the output capacity requirement: 10 A for more than 15 seconds, and 16 A for more than 200 milliseconds.
·Rectangular connector terminals, easy to install, commission, and use.
·Adopts a fully sealed enclosure, with an ingress protection rating of IP55.
·Set and restart the module via a communication protocol to switch among three backup power sources: lead-acid batteries, lithium batteries, and supercapacitors.Protection function
·Input phase-loss protection
·Output short-circuit protection
·Output overcurrent protection
·Output overvoltage protection
·Back-up power supply reverse connection protection -
THD1000B4824Z-A-3G Specifications
Test conditions
Input-output characteristics
Input voltage range
(VAC)Minimum value
100
Three-phase AC input: the phase-to-neutral voltages AB, BC, and CA are each 127 VAC; normal operation is ensured as long as the line-to-line voltage between any two phases is within specification. Typical value
127
Maximum value
154
Input Frequency (Hz)
45Hz~55Hz
Enter VA value
≤40VA
Input voltage: phase-to-phase voltages AB/BC/CA, 127 VAC; Vo2 drives a 10 W load. Power factor
≥0.7
Input voltage: phase-to-phase voltages AB/BC/CA, 127 VAC; output: two channels with a 5–20 W load. The backup power supply operates in lead-acid battery mode (with battery activation functionality).
Output voltage
Operating voltage
56.0~57.6VDC
The AC power is on, and the battery is in equalization charging. 54.0~55.5VDC
The AC power is on, and the battery is in float charge mode. Follow the battery voltage
AC power loss, battery-powered operation Battery equalization voltage
56.0~57.6VDC
AC input, in equalization charging mode, with no battery connected for measurement. Battery float charge voltage
53.5~55.5VDC
AC input, in float charge mode, with no battery connected for measurement. Battery activation completion point
46.5~47.5 VDC
AC power is connected, and the battery is attached. Vo2 drives a 4 A load, while the other channels remain unloaded. Activation is initiated via the panel buttons or the host computer. As the battery exits activation, the AC supply is disconnected, switching to battery power, and the battery voltage is measured at that moment. Battery undervoltage warning threshold
45.5~46.5 VDC
AC power is lost; battery-powered operation; Vo2 drives a 4 A load, while other channels remain unloaded. Battery discharge cutoff point
41.5~42.5 VDC
AC power is lost; battery-powered operation; Vo2 drives a 4 A load, while other channels remain unloaded. Battery discharge shutdown delay
1~10s
AC power is lost; battery-powered operation; Vo2 drives a 4 A load, while other channels remain unloaded. The backup power supply is lithium‑battery‑based and features battery‑life monitoring.
Output voltage
Operating voltage
56.0~57.6VDC
The AC power is on, and the battery is in equalization charging. 54.0~55.5VDC
The AC power is on, and the battery is in float charge mode. Follow the battery voltage
AC power loss, battery-powered operation Battery equalization voltage
56.0~57.6VDC
AC input, in equalization charging mode, with no battery connected for measurement. Battery float charge voltage
53.5~55.5 VDC
AC input, in float charge mode, with no battery connected for measurement. Battery Life Test Completion Point
46.5~47.5 VDC
AC power supply; connect the battery; Vo2 drives a 4 A load, while other channels remain unloaded; start via the panel buttons or the host computer. Battery undervoltage warning threshold
45.5~46.5 VDC
AC power is lost; battery-powered operation; Vo2 drives a 4 A load, while other channels remain unloaded. Battery discharge cutoff point
41.5~42.5 VDC
AC power is lost; battery-powered operation; Vo2 drives a 4 A load, while other channels remain unloaded. Battery discharge shutdown delay
1~10s
AC power is lost; battery-powered operation; Vo2 drives a 4 A load, while other channels remain unloaded. The backup power supply operates in supercapacitor mode (without equalization/float charging, activation, or lifespan‑monitoring functions).
Output voltage
Operating voltage
53.0~54.0 VDC
AC power available Follow the capacitor voltage
AC power loss, capacitor-powered supply Capacitor charging voltage
52.0~54.0 VDC
AC input: capacitor charging does not distinguish between equalization and float modes; do not connect a capacitor during measurement. Capacitor discharge turn-off point
34.5~35.5 VDC
AC power is lost; the capacitor supplies power; Vo2 drives a 4-A load, while the other channels remain unloaded. Capacitor discharge turn-off delay
1~5s
AC power is lost; the capacitor supplies power; Vo2 drives a 4-A load, while the other channels remain unloaded. The following are the general technical specifications.
Backup power supply charging current
0.3~0.7A
AC full-range input; connect to a backup power source; other channels can operate with or without load. Vo1 General Metrics
Output current
1A
Rated load current, excluding charging current Output inrush current
10A≥15s; 16A≥200ms;
Output voltage not less than 50 V
The AC input phase voltage is 127 VAC. During peak current testing, the number of tests shall not exceed two per minute, with an interval of more than 15 seconds between each test. When the input voltage falls below 115 VAC, the output peak current must be derated to no more than 70%. Ripple noise
≤500mV
At room temperature, with AC input across the full range, outputting 1 A into a load on channel Vo1, while other channels remain unloaded and no backup power supply is connected; measurements are taken using a 20 MHz oscilloscope, with a 105 pF capacitor added to the probe for testing. Voltage Regulation Rate
≤1%
Wide-range AC input; 1 A load on the Vo1 output; other channels remain unloaded. Load Regulation
≤2%
Rated AC input, Vo1 with 0~1A Load; other circuits are unloaded. Vo2 general metric
Output voltage
25.0~26.0 VDC
AC full-range input or backup power supply 42~60V Output current
4A
Rated load current Ripple noise
≤250mV
At room temperature, with AC input across the full range or powered by a backup supply, Vo2 drives a 4 A load while the other channels remain unloaded; measurements are taken using a 20 MHz oscilloscope, with a 105 pF capacitor connected to the probe for testing. Voltage Regulation Rate
≤1%
Operates from a full-range AC input or a backup power supply; the Vo2 output can drive a 4 A load, while the other channels remain unloaded. Load Regulation
≤2%
Rated input or backup power supply, Vo2 with 0~4A Load; other circuits are unloaded. General Indicators for Vo3
Output voltage
25.0~26.0 VDC
AC full-range input or backup power supply 42~60V Output current
1A
Rated load current Ripple noise
≤250mV
At room temperature, with AC input across the full range or powered by a backup supply, Vo3 drives a 1 A load while the other channels remain unloaded; measurements are taken using a 20 MHz oscilloscope, with a 105 pF capacitor connected in parallel to the probe for testing. Voltage Regulation Rate
≤1%
Operates from a full-range AC input or a backup power supply; Vo3 can drive a 1 A load, while the other channels remain unloaded. Load Regulation
≤2%
Rated input or backup power supply, Vo3 with 0~1A Load other circuits without load. Overall machine efficiency
>80%
Rated input voltage, rated output voltage; Vo1 drives a 4 A load, while the other outputs remain unloaded, with no backup power supply connected. Three-pin socket
The grounding terminal of the three‑pin socket is connected to the chassis ground, and the output voltage equals the line-to-line voltage of the three‑phase input.
When supplied with either two-phase or three-phase power, the voltage equals the input voltage. Load-carrying capability after power failure
No AC input or backup power; with a 10 A load, the output voltage remains no lower than 48 V within 100 ms.
No AC input or backup power supply; Vo1 delivers 10 A under load, with an output voltage no lower than 48 V. Testing is conducted within 100 ms of AC power loss. Protection function
Input phase-loss protection
There is
If any one phase of the three-phase system fails, the module continues to operate normally and reports a phase-loss fault. When two phases fail, the backup power source is seamlessly activated, and a phase-loss fault is reported. Output short-circuit protection
Vo1
Wide-range AC input; without a backup power supply, if Vo1 is shorted, the other outputs will be disabled; the system can self‑recover once the short circuit is cleared. Vo2
Operates from a full-range AC input or backup power supply, with auto-recovery after a short circuit is cleared; Vo2 is shorted, while the other channels remain operational. Vo3
Operates from a full-range AC input or backup power supply; automatically recovers after a short circuit is cleared; Vo3 is shorted, while the other channels remain operational. Output overcurrent protection
Vo1
Vo1 output ≥ 10 A; after a 20‑second delay, the output is shut off and automatically recovers once the overcurrent condition clears. When Vo1 experiences an overcurrent, the other channels remain non‑output. Vo1 output ≥ 16 A; the output shuts off after a 1‑second delay and automatically recovers once the overcurrent condition is cleared. When Vo1 experiences an overcurrent, the other channels remain non‑outputting. When Vo1 output exceeds 18 A, the output is immediately shut off; after the fault is cleared, the system automatically recovers. If Vo1 experiences an overcurrent condition, the other channels will have no output. Vo2
Vo2 Output 5.0~6.5A , flow-limiting, Vo2 Overcurrent does not affect the output of other channels. Vo3
Vo3 Output 1.5~2.5A , hiccup-mode protection, self-recovery after fault clearance, Vo3 Overcurrent does not affect the output of other channels. Output Overvoltage Protection
59~60 VDC
The backup power supply uses a lead-acid battery. Charging stops when the battery voltage exceeds the over‑voltage threshold, and the undervoltage indicator flashes while an over‑voltage alarm is reported. Charging resumes once the fault is cleared. 59~62VDC
The backup power supply is a lithium battery. Charging stops when the battery voltage exceeds the over‑voltage threshold, and the undervoltage indicator flashes while an over‑voltage alarm signal is reported. Charging resumes once the fault has been cleared. 56~57 VDC
The backup power source is a supercapacitor. When the capacitor voltage exceeds the threshold, charging stops; the undervoltage indicator flashes, and an overvoltage alarm signal is reported. Charging resumes once the fault is cleared. Back-Feed Protection for Backup Power Supply
(Reverse connection of the battery while the device is powered on is strictly prohibited.)After the backup power supply is connected in reverse, the module remains undamaged but produces no output; once AC power is applied, the fault indicator lights up.
No AC input; reverse connection of the backup power supply; press the battery start button. In the event of reverse connection to the backup power supply, connect the AC power. Temperature characteristics
Storage Temperature (°C)
Minimum value
~40
Typical value
25
Maximum value
70
Operating ambient temperature
(℃)Minimum value
~40
Typical value
25
Maximum value
70 ( 55 Can operate at full load below ℃, 55~70 At ℃, derate to 50% Use)
Insulation and Dielectric Strength Safety Characteristics
Input-to-output withstand voltage
Leakage current is less than 5 mA, with no flashover, arcing, or breakdown.
At room temperature, under an AC voltage of 2500 V for 1 minute, the output circuit includes the operating power supply, device power supply, communication power supply, and backup power supply (VO1, VO2, VO3, battery terminals); the same applies hereinafter.
Input-to-ground withstand voltage
Leakage current is less than 5 mA, with no flashover, arcing, or breakdown.
At room temperature, AC 2500 V, for 1 minute
Output-to-ground withstand voltage
Leakage current is less than 5 mA, with no flashover, arcing, or breakdown.
At room temperature, 500 V AC, for 1 minute.
485 pairs of output withstand voltage
Leakage current is less than 5 mA, with no flashover, arcing, or breakdown.
At room temperature, 500 V AC, for 1 minute.
The withstand voltage between Vo1, Vo2, and Vo3
Leakage current is less than 5 mA, with no flashover, arcing, or breakdown.
At room temperature, 500 V AC, for 1 minute.
Input-to-output impedance
Greater than 200 MΩ
At room temperature, test using a 500 V megohmmeter.
Input to enclosure impedance
Greater than 200 MΩ
At room temperature, test using a 500 V megohmmeter.
Output to enclosure impedance
Greater than 200 MΩ
At room temperature, test using a 500 V megohmmeter.
Impulse voltage
Input to ground; input to output
During the test, no breakdown or discharge shall occur, and after the test, the module’s performance parameters shall remain within normal limits.
5 kV standard wave, applied three times with positive polarity and three times with negative polarity.
(1.2/50 micro- s) of impulse voltage, with an interval of no less than 5 seconds between each application.Output to ground; 485 to ground; 485 to output; Vo1, Vo2, and Vo3 with respect to one another
During the test, no breakdown or discharge shall occur, and after the test, the module’s performance parameters shall remain within normal limits.
1 kV standard wave, with three positive‑polarity and three negative‑polarity standard waves applied (1.2/50). micro- s) of impulse voltage, with an interval of no less than 5 seconds between each application.
Other features
MTBF (hours)
≥60000
Cooling method
Natural cooling
Dimensions (mm)
Not greater than 427.4 mm × 250.9 mm × 88.1 mm (length × width × height)
EMC
Both input and output comply with the relevant test requirements of GB/T 17626.
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